Abstract:
The present disclosure relates to an apparatus and a method of post-processing exhaust gas for removing sulfur oxides, and more particularly, relates to an apparatus and a method of post-processing exhaust gas for removing sulfur oxides, in which exhaust gas is produced when fuel is combusted in a diesel internal combustion engine and the exhaust gas is purified by the apparatus for post-processing exhaust gas, and in this case, sulfur oxides (SOx) is produced and stacked in a catalytic device (diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR)) equipped in the apparatus for post-processing exhaust gas during a process of purifying the exhaust gas, and the sulfur oxides is removed.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This present application is a continuation of and claims priority of International Application No. PCT/KR2014/008389, filed Sep. 5, 2014, which claims priority of Korean Application No. 10-2013-0106585, filed Sep. 5, 2013, the contents of which are hereby incorporated by reference in their entireties. 
     
    
     FIELD OF THE DISCLOSURE 
       [0002]    The present disclosure relates to exhaust gas post-processing for removing sulfur oxides, and more particularly, to an apparatus and a method of post-processing exhaust gas for removing sulfur oxides, which are capable of removing sulfur oxides (SOx) that is produced and stacked in a catalytic device (diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR)) equipped on the apparatus for post-processing exhaust gas during a process of purifying exhaust gas. 
       BACKGROUND OF THE DISCLOSURE 
       [0003]    In general, when fuel is combusted in a diesel internal combustion engine using oil fuel, exhaust gas is produced. The exhaust gas contains a harmful material having a gas phase, such as a carbon monoxide (CO), hydrocarbon (HC), and a nitrogen oxide (NOx). As a technology for removing the harmful material, an exhaust gas post-processing apparatus is used. A catalytic device is used in the exhaust gas post-processing apparatus. The catalytic device includes a selective catalytic reduction (SCR) device and a diesel oxidation catalyst (DOC) device. 
         [0004]    The SCR is a technology for oxidizing a nitrogen monoxide (NO) in the exhaust gas to a nitrogen oxide (NO 2 ) by using a dielectric barrier discharge (DBD), and then removing the nitrogen oxide (NO 2 ) by adding a urea-aqueous solution. 
         [0005]    The DOC is a technology for oxidizing a hydrocarbon compound (HC) and a carbon monoxide (CO) in the exhaust gas to harmless water (H 2 O) and carbon dioxide (CO 2 ). 
         [0006]    In the meantime, a part of an oxidation reaction generable in the catalytic device (DOC and SRC) may produce an undesirable product, and a reverse effect may be actually generated in an effect of a catalyst. For example, sulfur oxides may be produced and stacked on the catalytic device. More particularly, a sulfur dioxide (SO 2 ) is oxidized to a sulfur trioxide (SO 3 ) and the sulfur trioxide (SO 3 ) is bonded with vapor, so that sulfuric acid (H 2 SO 4 ) in a gas state may be produced. The sulfuric acid vapor is bonded to other vapor to produce sulfuric acid particles detected as particles when the exhaust of the total particulate matters (PM) from an engine is evaluated. The sulfur oxides may hinder an oxidation activity of the catalytic device. Accordingly, it is necessary to appropriately remove the sulfur oxides. 
         [0007]    In the meantime, in the existing technology for removing sulfur oxides, it is known that when a high temperature environment of 600ccordingly, it is necessary to appropriately removeprogresses. 
         [0008]    However, in order to create a high temperature of 600 of 600ccordingly, it is necessary to appropriately removeprogresses.ected as particles when the exhaust of the total particulate matters (PM) from an engine is evaluated. In the meantime, sulfur or sulfur oxides component may have a different adsorption and desorption characteristic with respect to a catalyst according to the kind of catalyst and the form of sulfur oxides. For example, under a specific temperature environment, a specific sulfur oxides is removed, but sulfur oxides having another characteristic may not be removed. Accordingly, a uniform regeneration and control when the catalytic device is regenerated has a limit in removing sulfur oxides. 
       LITERATURE OF RELATED ART 
       [0000]    
       
         Patent Literature 1: Korean Patent Application Laid-Open No. 10-2008-0021123 (Mar. 6, 2008) 
         Patent Literature 2: Korean Patent Application Laid-Open No. 10-2010-0116898 (Nov. 2, 2010) 
         Patent Literature 3: Korean Patent Application Laid-Open No. 10-2006-0054423 (May 22, 2006) 
         Patent Literature 4: Korean Patent Application Laid-Open No. 10-2006-0002178 (Jan. 9, 2006) 
       
     
         [0013]    The discussion above is merely provided for general background information and is not intended to be used as an aid in determining the scope of the claimed subject matter. 
       SUMMARY 
       [0014]    This summary and the abstract are provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. The summary and the abstract are not intended to identify key features or essential features of the claimed subject matter. 
         [0015]    An object of the present disclosure is to provide an apparatus for post-processing exhaust gas for removing sulfur oxides, which is capable of removing sulfur oxides by differently controlling a regeneration cycle and a desorption condition according to the kind of sulfur or sulfur oxides adsorbed to a catalytic device when creating a high temperature environment so that a desulfurization operation is performed by injecting fuel to the apparatus for post-processing exhaust gas. 
         [0016]    A technical object to be achieved in the present disclosure is not limited to the aforementioned technical objects, and another not-mentioned technical object will be obviously understood from the description below by those with ordinary skill in the art to which the present disclosure pertains. 
         [0017]    In order to solve the technical problem, an exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: an input unit configured to receive one or more elements of operation information of a vehicle among an engine operation time, an engine fuel consumption quantity, a vehicle trip distance, and sulfur oxides produced quantity; a memory unit configured to store a first operation information value for processing sulfur oxides and a second operation information value for processing sulfur oxides, wherein the first operation information value and the second operation information value are generated by evaluating the operation information received from the input unit; a first processing unit configured to determine whether the first operation information value stored in the memory unit reaches a predetermined first reference value, and command a low temperature control when the first operation information value reaches the first reference value; a second processing unit configured to determine whether the second operation information value stored in the memory unit reaches a predetermined second reference value, and command a high temperature control when the second operation information value reaches the predetermined second reference value; and sulfur oxides removal operating unit configured to remove a first sulfur oxides by heating a catalytic device under a first temperature condition when the low temperature control command is generated from the first processing unit, and remove the first sulfur oxides and a second sulfur oxides by heating the catalytic device under a second temperature condition when the high temperature control command is generated from the second processing unit. 
         [0018]    The first processing unit may initialize the first operation information value of the memory unit after the low temperature control command is generated, and the second processing unit may initialize the second operation information value of the memory unit after the high temperature control command is generated. 
         [0019]    When the second processing unit initializes the second operation information value of the memory unit, the second processing unit may initialize the first operation information value of the memory unit together. 
         [0020]    In the sulfur oxides removal operating unit, the first temperature condition may be 400 enerated.er and the second temperature condition may be 600° C. or higher. 
         [0021]    The predetermined first reference value may be smaller than the second reference value. 
         [0022]    The apparatus may further include a manual control unit configured to generate a high temperature control command, in which when the high temperature control command is generated from the manual control unit, the first sulfur oxides and the second sulfur oxides are removed by heating the catalytic device under the second temperature condition, and the first operation information value and the second operation information value of the memory unit are initialized. 
         [0023]    The first sulfur oxides may include ammonium sulfate ((NH 4 ) 2 SO 4 ), and the second sulfur oxides may include copper sulfate (CuSO 4 ). 
         [0024]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides a method of post-processing exhaust gas for removing sulfur oxides, the method including: an input operation of receiving one or more elements of operation information of a vehicle among an engine operation time, an engine fuel consumption quantity, a vehicle trip distance, and sulfur oxides produced quantity from an input unit; an evaluating operation of generating a first operation information value for processing sulfur oxides and a second operation information value for processing sulfur oxides by evaluating the operation information received from the input operation; a first command operation of determining whether the first operation information value evaluated in the evaluating operation reaches a predetermined first reference value, and commanding a low temperature control when the first operation information value reaches the predetermined first reference value; a second command operation of determining whether the second operation information value evaluated in the evaluating operation reaches a predetermined second reference value, and commanding a high temperature control when the second operation information value reaches the predetermined second reference value; a first removal operation of removing a first sulfur oxides by heating a catalytic device under a first temperature condition when the low temperature control command is generated in the first command operation; and a second removal operation of removing the first sulfur oxides and a second sulfur oxides by heating the catalytic device under a second temperature condition when a high temperature control command is generated in the second command operation. 
         [0025]    The method may further include: initializing the first operation information value after the low temperature control command is generated; and initializing the second operation information value after the high temperature control command is generated. 
         [0026]    When the second operation information value is initialized, the first operation information value may be initialized together. 
         [0027]    When the received operation information is the engine operation time, the second reference value may be set to a range from 1.5 times to 20 times the first reference value. 
         [0028]    When the received operation information is the engine fuel consumption quantity, the second reference value may be set to a range from 1.5 times to 10 times the first reference value. 
         [0029]    When the received operation information is the vehicle trip distance, the second reference value may be set to a range from 1.5 times to 5 times the first reference value. 
         [0030]    When the received operation information is the sulfur oxides produced quantity, the first reference value may be sulfur oxides storage quantity of a DOC or a first sulfur oxides storage quantity, and the second reference value may be a second sulfur oxides storage quantity. 
         [0031]    The first temperature condition may be 400 value may be a second nce, the second reference value may be set to a ranThe predetermined first reference value may be smaller than the second reference value. 
         [0032]    A manual control unit generating a high temperature control command may be further included, and the method may further include when the high temperature control command is generated from the manual control unit, removing the first sulfur oxides and the second sulfur oxides by heating the catalytic device under the second temperature condition, and initializing the first operation information value and the second operation information value. 
         [0033]    The first sulfur oxides may include ammonium sulfate ((NH 4 ) 2 SO 4 ), and the second sulfur oxides may include copper sulfate (CuSO 4 ). 
         [0034]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; and a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216 . 
         [0035]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first fuel quantity processing unit  222  configured to receive information on an engine fuel consumption quantity  120  about a degree of fuel consumed by an engine, be set with a small quantity reference value  224  and a large quantity reference value  228 , evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the small quantity reference value  224 , and generate a low temperature control command when the evaluated value reaches the small quantity reference value  224 ; and a second fuel quantity processing unit  226  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the large quantity reference value  228 , and generate a high temperature control command when the evaluated value reaches the large quantity reference value  228 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the engine fuel consumption quantity  120  evaluated in the first fuel quantity processing unit  222 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the engine fuel consumption quantity  120  evaluated in the second fuel quantity processing unit  226 . 
         [0036]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first distance processing unit  232  configured to receive information on a vehicle trip distance  130  about a degree of a trip distance of a vehicle, be set with a short distance reference value  234  and a long distance reference value  238 , evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the short distance reference value  234 , and generate a low temperature control command when the evaluated value reaches the short distance reference value  234 ; and a second distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the long distance reference value  238 , and generate a high temperature control command when the evaluated value reaches the long distance reference value  238 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the vehicle trip distance  130  evaluated in the first distance processing unit  232 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the vehicle trip distance  130  evaluated in the second distance processing unit  236 . 
         [0037]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a DOC sulfur oxides storage quantity calculating unit  252  configured to be set with sulfur oxides quantity reference value  256  and first and second sulfur oxides quantity reference values  266   a  and  266   b , receive information on sulfur oxides produced quantity  140  about a degree of quantity of sulfur oxides produced, receive a DOC inlet exhaust gas temperature  142 , and calculate a storage quantity of sulfur oxides produced in a DOC; sulfur oxides quantity processing unit  258  configured to evaluate the storage quantity of sulfur oxides, determine whether the evaluated storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 , and generate a low temperature control command when the storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 ; a first sulfur oxides storage quantity processing unit  266   a  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive an SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a first sulfur oxides produced in an SCR; a first sulfur oxides quantity processing unit  268   a  configured to evaluate the storage quantity of the first sulfur oxides, determine whether the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a , and generate a low temperature control command when the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a ; a second sulfur oxides storage quantity processing unit  266   b  configured to receive information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive the SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a second sulfur oxides produced in the SCR; and a second sulfur oxides quantity processing unit  268   b  configured to evaluate the storage quantity of the second sulfur oxides, determine whether the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , and generate a high temperature control command when the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the sulfur oxides produced quantity  140  evaluated in each of the sulfur oxides quantity processing unit  258  and the first sulfur oxides quantity processing unit  268   a , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the sulfur oxides produced quantity  140  evaluated in the second sulfur oxides quantity processing unit  268   b.    
         [0038]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time, for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , receive information on an engine fuel consumption quantity  120  about a degree of fuel consumed by the engine, be set with a small quantity reference value  224  and a large quantity reference value  228 , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a first fuel quantity processing unit  222  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the small quantity reference value  224 , and generate the low temperature control command when the evaluated value reaches the small quantity reference value  224 ; and a second fuel quantity processing unit  226  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the large quantity reference value  228 , and generate the high temperature control command when the evaluated value reaches the large quantity reference value  228 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212  and the information on the engine fuel consumption quantity  120  evaluated in the first fuel quantity processing unit  222 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216  and the information on the engine fuel consumption quantity  120  evaluated in the second fuel quantity processing unit  226 . 
         [0039]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time, for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , receive information on a vehicle trip distance  130  about a degree of a trip distance of a vehicle, be set with a short distance reference value  234  and a long distance reference value  238 , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a first distance processing unit  232  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the short distance reference value  234 , and generate a low temperature control command when the evaluated value reaches the short distance reference value  234 ; and a second distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the long distance reference value  238 , and generate a high temperature control command when the evaluated value reaches the long distance reference value  238 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212  and the information on the vehicle trip distance  130  evaluated in the first distance processing unit  232 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216  and the information on the vehicle trip distance  130  evaluated in the second distance processing unit  236 . 
         [0040]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , set with sulfur oxides quantity reference value  256  and first and second sulfur oxides quantity reference values  266   a  and  266   b , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a DOC sulfur oxides storage quantity calculating unit  252  configured to receive information on sulfur oxides produced quantity  140  about a degree of quantity of sulfur oxides produced, receive a DOC inlet exhaust gas temperature  142 , and calculate a storage quantity of sulfur oxides produced in a DOC; sulfur oxides quantity processing unit  258  configured to evaluate the storage quantity of sulfur oxides, determine whether the evaluated storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 , and generate a low temperature control command when the storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 ; a first sulfur oxides storage quantity processing unit  266   a  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive an SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a first sulfur oxides produced in an SCR; a first sulfur oxides quantity processing unit  268   a  configured to evaluate the storage quantity of the first sulfur oxides, determine whether the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a , and generate a low temperature control command when the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a ; a second sulfur oxides storage quantity processing unit  266   b  configured to receive information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive the SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a second sulfur oxides produced in the SCR; and a second sulfur oxides quantity processing unit  268   b  configured to evaluate the storage quantity of the second sulfur oxides, determine whether the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , and generate a high temperature control command when the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212 , and the information on the sulfur oxides produced quantity  140  evaluated in each of the sulfur oxides quantity processing unit  258  and the first sulfur oxides quantity processing unit  268   a , and, when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216 , and the information on the sulfur oxides produced quantity  140  evaluated in the second sulfur oxides quantity processing unit  268   b.    
         [0041]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time, for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , receive information on an engine fuel consumption quantity  120  about a degree of fuel consumed by the engine, be set with a small quantity reference value  224  and a large quantity reference value  228 , receive information on a vehicle trip distance  130  about a degree of a trip distance of a vehicle, be set with a short distance reference value  234  and a long distance reference value  238 , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a first fuel quantity processing unit  222  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the small quantity reference value  224 , and generate a low temperature control command when the evaluated value reaches the small quantity reference value  224 ; a second fuel quantity processing unit  226  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the large quantity reference value  228 , and generate a high temperature control command when the evaluated value reaches the large quantity reference value  228 ; a first distance processing unit  232  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the short distance reference value  234 , and generate the low temperature control command when the evaluated value reaches the short distance reference value  234 ; and a second distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the long distance reference value  238 , and generate the high temperature control command when the evaluated value reaches the long distance reference value  238 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212 , the information on the engine fuel consumption quantity  120  evaluated in the first fuel quantity processing unit  222 , and the information on the vehicle trip distance  130  evaluated in the first distance processing unit  232 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216 , the information on the engine fuel consumption quantity  120  evaluated in the second fuel quantity processing unit  226 , and the information on the vehicle trip distance  130  evaluated in the second distance processing unit  236 . 
         [0042]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time, for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , receive information on an engine fuel consumption quantity  120  about a degree of fuel consumed by the engine, be set with a small quantity reference value  224  and a large quantity reference value  228 , be set with sulfur oxides quantity reference value  256  and first and second sulfur oxides quantity reference values  266   a  and  266   b , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a first fuel quantity processing unit  222  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the small quantity reference value  224 , and generate the low temperature control command when the evaluated value reaches the small quantity reference value  224 ; a second fuel quantity processing unit  222  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the large quantity reference value  228 , and generate the high temperature control command when the evaluated value reaches the large quantity reference value  228 ; a DOC sulfur oxides storage quantity calculating unit  252  configured to receive information on sulfur oxides produced quantity  140  about a degree of quantity of sulfur oxides produced, receive a DOC inlet exhaust gas temperature  142 , and calculate a storage quantity of sulfur oxides produced in a DOC; sulfur oxides quantity processing unit  258  configured to evaluate the storage quantity of sulfur oxides, determine whether the evaluated storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 , and generate the low temperature control command when the storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 ; a first sulfur oxides storage quantity processing unit  266   a  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive an SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a first sulfur oxides produced in an SCR; a first sulfur oxides quantity processing unit  268   a  configured to evaluate the storage quantity of the first sulfur oxides, determine whether the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a , and generate the low temperature control command when the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a ; a second sulfur oxides storage quantity processing unit  266   b  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive the SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a second sulfur oxides produced in the SCR; and a second sulfur oxides quantity processing unit  268   b  configured to evaluate the storage quantity of the second sulfur oxides, determine whether the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , and generate the high temperature control command when the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command, and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212  and the information on the engine fuel consumption quantity  120  evaluated in the first fuel quantity processing unit  222  and initializes the information on the sulfur oxides produced quantity  140  evaluated in each of the sulfur oxides quantity processing unit  258  and the first sulfur oxides quantity processing unit  268   a , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command, and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216  and the information on the engine fuel consumption quantity  120  evaluated in the second fuel quantity processing unit  226  and initializes the information on the sulfur oxides produced quantity  140  evaluated in the second sulfur oxides quantity processing unit  268   b.    
         [0043]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time, for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , receive information on a vehicle trip distance  130  about a degree of a trip distance of a vehicle, be set with a short distance reference value  234  and a long distance reference value  238 , be set with sulfur oxides quantity reference value  256  and first and second sulfur oxides quantity reference values  266   a  and  266   b , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a first distance processing unit  232  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the short distance reference value  234 , and generate the low temperature control command when the evaluated value reaches the short distance reference value  234 ; a second distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the long distance reference value  238 , and generate the high temperature control command when the evaluated value reaches the long distance reference value  238 ; a DOC sulfur oxides storage quantity calculating unit  252  configured to receive information on sulfur oxides produced quantity  140  about a degree of quantity of sulfur oxides produced, receive a DOC inlet exhaust gas temperature  142 , and calculate a storage quantity of sulfur oxides produced in a DOC; sulfur oxides quantity processing unit  258  configured to evaluate the storage quantity of sulfur oxides, determine whether the evaluated storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 , and generate the low temperature control command when the storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 ; a first sulfur oxides storage quantity processing unit  266   a  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive an SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a first sulfur oxides produced in an SCR; a first sulfur oxides quantity processing unit  268   a  configured to evaluate the storage quantity of the first sulfur oxides, determine whether the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a , and generate the low temperature control command when the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a ; a second sulfur oxides storage quantity processing unit  266   b  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive the SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a second sulfur oxides produced in the SCR; and a second sulfur oxides quantity processing unit  268   b  configured to evaluate the storage quantity of the second sulfur oxides, determine whether the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , and generate the high temperature control command when the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command, and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212  and the information on the vehicle trip distance  130  evaluated in the first distance processing unit  232  and initializes the information on the sulfur oxides produced quantity  140  evaluated in each of the sulfur oxides quantity processing unit  258  and the first sulfur oxides quantity processing unit  268   a , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command, and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216  and the information on the vehicle trip distance  130  evaluated in the second distance processing unit  236  and initializes the information on the sulfur oxides produced quantity  140  evaluated in the second sulfur oxides quantity processing unit  268   b.    
         [0044]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first time processing unit  212  configured to receive information on an engine operation time  110  about a degree of time, for which an engine is operated, be set with a short time reference value  214  and a long time reference value  218 , receive information on an engine fuel consumption quantity  120  about a degree of fuel consumed by the engine, be set with a small quantity reference value  224  and a large quantity reference value  228 , receive information on a vehicle trip distance  130  about a degree of a trip distance of the vehicle, be set with a short distance reference value  234  and a long distance reference value  238 , be set with sulfur oxides quantity reference value  256  and first and second sulfur oxides quantity reference values  266   a  and  266   b , evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the short time reference value  214 , and generate a low temperature control command when the evaluated value reaches the short time reference value  214 ; a second time processing unit  216  configured to evaluate the information on the engine operation time  110 , determine whether the evaluated value reaches the long time reference value  218 , and generate a high temperature control command when the evaluated value reaches the long time reference value  218 ; a first fuel quantity processing unit  222  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the small quantity reference value  224 , and generate the low temperature control command when the evaluated value reaches the small quantity reference value  224 ; a second fuel quantity processing unit  226  configured to evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the large quantity reference value  224 , and generate the high temperature control command when the evaluated value reaches the large quantity reference value  228 ; a first distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the short distance reference value  234 , and generate the low temperature control command when the evaluated value reaches the short distance reference value  234 ; a second distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the long distance reference value  238 , and generate the high temperature control command when the evaluated value reaches the long distance reference value  238 ; a DOC sulfur oxides storage quantity calculating unit  252  configured to receive information on sulfur oxides produced quantity  140  about a degree of quantity of sulfur oxides produced, receive a DOC inlet exhaust gas temperature  142 , and calculate a storage quantity of sulfur oxides produced in a DOC; sulfur oxides quantity processing unit  258  configured to evaluate the storage quantity of sulfur oxides, determine whether the evaluated storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 , and generate the low temperature control command when the storage quantity of sulfur oxides reaches the sulfur oxides quantity reference value  256 ; a first sulfur oxides storage quantity processing unit  266   a  configured to receive the information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive an SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a first sulfur oxides produced in an SCR; a first sulfur oxides quantity processing unit  268   a  configured to evaluate the storage quantity of the first sulfur oxides, determine whether the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a , and generate the low temperature control command when the evaluated storage quantity of the first sulfur oxides reaches the first sulfur oxides quantity reference value  266   a ; a second sulfur oxides storage quantity processing unit  266   b  configured to receive information on the sulfur oxides produced quantity  140 , receive the storage quantity of sulfur oxides, receive the SCR inlet exhaust gas temperature  144 , and calculate a storage quantity of a second sulfur oxides produced in the SCR; and a second sulfur oxides quantity processing unit  268   b  configured to evaluate the storage quantity of the second sulfur oxides, determine whether the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , and generate the high temperature control command when the evaluated storage quantity of the second sulfur oxides reaches the second sulfur oxides quantity reference value  266   b , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command, and initializes the information on the engine operation time  110  evaluated in the first time processing unit  212 , the information on the engine fuel consumption quantity  120  evaluated in the first fuel quantity processing unit  222 , and the information on the vehicle trip distance  130  evaluated in the first distance processing unit  232  and initializes the information on the sulfur oxides produced quantity  140  evaluated in each of the sulfur oxides quantity processing unit  258  and the first sulfur oxides quantity processing unit  268   a , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command, and initializes the information on the engine operation time  110  evaluated in the second time processing unit  216 , the information on the engine fuel consumption quantity  120  evaluated in the second fuel quantity processing unit  226 , and the information on the vehicle trip distance  130  evaluated in the second distance processing unit  236  and initializes the information on the sulfur oxides produced quantity  140  evaluated in the second sulfur oxides quantity processing unit  268   b.    
         [0045]    In order to solve the technical problem, another exemplary embodiment of the present disclosure provides an apparatus for post-processing exhaust gas for removing sulfur oxides, the apparatus including: a first fuel quantity processing unit  222  configured to information on an engine fuel consumption quantity  120  about an amount of fuel consumed by the engine, be set with a small quantity reference value  224  and a large quantity reference value  228 , receive information on a vehicle trip distance  130  about a degree of a trip distance of a vehicle, be set with a short distance reference value  234  and a long distance reference value  238 , evaluate the information on the engine fuel consumption quantity  120 , determine whether the evaluated value reaches the small quantity reference value  224 , and generate a low temperature control command when the evaluated value reaches the small quantity reference value  224 ; a second fuel quantity processing unit  226  configured to evaluate the information on the engine fuel consumption  120 , determine whether the evaluated value reaches the large quantity reference value  228 , and generate a high temperature control command when the evaluated value reaches the large quantity reference value  228 ; a first distance processing unit  232  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the short distance reference value  234 , and generate the low temperature control command when the evaluated value reaches the short distance reference value  234 ; and a second distance processing unit  236  configured to evaluate the information on the vehicle trip distance  130 , determine whether the evaluated value reaches the long distance reference value  238 , and generate the high temperature control command when the evaluated value reaches the long distance reference value  238 , in which when the low temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively low temperature compared to the high temperature control command, and initializes the information on the engine fuel consumption quantity  120  evaluated in the first fuel quantity processing unit  222  and the information on the vehicle trip distance  130  evaluated in the first distance processing unit  232 , and when the high temperature control command is generated, the apparatus performs an operation of removing the sulfur oxides at a relatively high temperature compared to the low temperature control command, and initializes the information on the engine fuel consumption quantity  120  evaluated in the second fuel quantity processing unit  226  and the information on the vehicle trip distance  130  evaluated in the second distance processing unit  236 . 
         [0046]    When the second time processing unit  216  is initialized, the first time processing unit  212  may be initialized together. 
         [0047]    The long time reference value  218  may be set to 1.5 times to 20 times the short time reference value  214 . 
         [0048]    When the second fuel quantity processing unit  226  is initialized, the first fuel quantity processing unit  222  may be initialized together. 
         [0049]    The large quantity reference value  228  may be set to 1.5 times to 10 times the small quantity reference value  224 . 
         [0050]    When the second distance processing unit  236  is initialized, the first distance processing unit  232  may be initialized together. 
         [0051]    The long distance reference value  238  may be set to 1.5 times to 5 times the short distance reference value  234 . 
         [0052]    When the second sulfur oxides quantity processing unit  268   b  is initialized, the sulfur oxides quantity processing unit  258  and the first sulfur oxides quantity processing unit  268   a  may be initialized together. 
         [0053]    A temperature implemented when the operation of removing the sulfur oxides is performed by the low temperature control command may be 400 to 5 times the short distance reference value  234 .alized together.emoving the sulfur oxides is performed by the high temperature control command may be 600nd may be 600The apparatus may set an effective temperature when an actually implemented temperature is higher than a predetermined temperature after the low temperature control command or the high temperature control command is generated, and may further include sulfur oxides removal evaluating unit  410  configured to evaluate a time during the implementation of the effective temperature, and determine that the operation of removing the sulfur oxides is successful when the evaluated time is longer than a predetermined effective time. 
         [0054]    The effective time may be 5 minutes to 30 minutes. 
         [0055]    The method may further include a monitoring unit  420  configured to stop the operation of removing the sulfur oxides when the operation of removing the sulfur oxides is not properly performed after the low temperature control command or the high temperature control command is generated, and display a message through which a user may visually or audibly recognize a failure of the operation of removing the sulfur oxides. 
         [0056]    The method may further include a manual control unit  270  configured to make the user manually initiate the operation of removing the sulfur oxides when the operation of removing the sulfur oxides is failed. 
         [0057]    Other detailed matters of the exemplary embodiments are included in the detailed description and the drawings. 
         [0058]    The sulfur oxides caused from the fuel and the engine oil is adsorbed to a catalyst in the form of sulfur oxides to degrade performance, and has a characteristic in that an adsorption rate of the sulfur oxides to the catalyst is different according to the kind of catalyst and the form of sulfur oxides. Accordingly, the apparatus and the method of post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present invention may separate and control a regeneration cycle and a regeneration temperature of the apparatus for post-processing exhaust gas even though the sulfur oxides has a different characteristic according to the form of sulfur oxides, thereby removing most of the sulfur oxides. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0059]      FIG. 1  is a graph for describing an adsorption and desorption characteristic of sulfur oxides according to a catalyst. 
           [0060]      FIG. 2  is a diagram for describing an apparatus for post-processing exhaust gas for removing sulfur oxides according to an exemplary embodiment of the present disclosure. 
           [0061]      FIG. 3  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of a catalytic device are set based on information on an engine operation time in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
           [0062]      FIG. 4  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of a catalytic device are set based on information on an engine fuel consumption quantity in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
           [0063]      FIG. 5  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of a catalytic device are set based on information on a vehicle trip distance in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
           [0064]      FIG. 6  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of a catalytic device are set based on information on sulfur oxides produced quantity in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
       
    
    
     DESCRIPTION OF MAIN REFERENCE NUMERALS OF THE DRAWINGS 
       [0000]    
       
           100 : Input unit 
           110 : Engine operating time 
           120 : Engine fuel consumption quantity 
           130 : Vehicle trip distance 
           140 : Sulfur oxide produced quantity 
           142 : DOC inlet exhaust gas temperature information 
           144 : SCR inlet exhaust gas temperature information 
           200 : Memory unit 
           210 : Time calculation processing unit 
           212 : First time processing unit 
           214 : Short time reference value 
           216 : Second time processing unit 
           218 : Long time reference value 
           220 : Fuel quantity calculation processing unit 
           222 : First fuel quantity processing unit 
           224 : Small quantity reference value 
           226 : Second fuel quantity processing unit 
           228 : Large quantity reference value 
           230 : Distance calculation processing unit 
           232 : First distance processing unit 
           234 : Short distance reference value 
           236 : Second distance processing unit 
           238 : Long distance reference value 
           240 : Sulfur oxide quantity calculation processing unit 
           250 : DOC calculation processing unit 
           252 : DOC sulfur oxides storage quantity calculating unit 
           256 : Sulfur oxide quantity reference value 
           258 : Sulfur oxide quantity processing unit 
           260 : SCR calculation processing unit 
           261   a ,  262   a : First, second sulfur oxides adsorption characteristic 
           261   b ,  262   b : First, second sulfur oxides desorption characteristic 
           264   a ,  264   b : First, second sulfur oxides storage quantity processing unit 
           266   a ,  266   b : First, second sulfur oxides storage quantity reference value 
           268   a ,  268   b : First, second sulfur oxides quantity processing unit 
           270 : Manual control unit 
           310 ,  320 : First, second processing unit 
           410 : Sulfur oxide removal evaluating unit 
           420 : Monitoring unit 
           500 : Sulfur oxide removal operating unit 
           510 : End 
           520 : Exhaust gas temperature control unit 
           521 : Low temperature control unit 
           522 : High temperature control unit 
       
     
       DETAILED DESCRIPTION 
       [0108]    Advantages and characteristics of the present disclosure, and a method of achieving the advantages and characteristics will be clear with reference to an exemplary embodiment to be described in detail together with the accompanying drawings. 
         [0109]    Hereinafter, an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. It should be appreciated that the exemplary embodiment, which will be described below, is illustratively described for helping to understand the present disclosure, and the present disclosure may be variously modified to be carried out differently from the exemplary embodiment described herein. In the following description of the present disclosure, a detailed description and a detailed illustration of publicly known functions or constituent elements incorporated herein will be omitted when it is determined that the detailed description may unnecessarily make the subject matter of the present disclosure unclear. 
         [0110]    Further, the terms used in the description are defined considering the functions of the present disclosure and may vary depending on the intention or usual practice of a manufacturer. Therefore, the definitions should be made based on the entire contents of the present specification. 
         [0111]    In the meantime, a numerical value suggested throughout the specification is a value suggested for helping to understand the invention, and the numerical value does not influence the scope of the present disclosure. 
         [0112]    Like reference numerals indicate like elements throughout the specification. 
         [0113]    Hereinafter, an adsorption/desorption characteristic of sulfur oxides according to sulfur oxides when an apparatus for post-processing exhaust gas performs a regeneration operation for removing sulfur oxides will be described with reference to  FIG. 1 .  FIG. 1  is a graph for describing an adsorption and desorption characteristic of sulfur oxides according to a catalyst. 
         [0114]    As illustrated in  FIG. 1 , graph (a) of  FIG. 1  is a graph representing a general situation of an adsorption/desorption characteristic of sulfur oxides. A horizontal axis means a temperature, and a left vertical axis represents a weight change (%) and a right vertical axis represents a concentration of sulfur oxides. 
         [0115]    That is, in reviewing graph (a) of  FIG. 1 , it can be seen that when a temperature is increased, a weight change rate is gradually decreased. This means that when a temperature is increased, sulfur oxides, which is in an adsorbed state, is desorbed in the apparatus for post-processing exhaust gas. 
         [0116]    In the meantime, the sulfur oxides represents a high concentration at a specific temperature. For example, the sulfur oxides represents a high concentration in a first temperature section and a second temperature section. Here, the first temperature section is about 400tion is about 400ond tempnd temperature section is about 600° C. to 750° C. This means that the sulfur oxides is more actively desorbed in a specific temperature section. 
         [0117]    Graphs (b) and (c) of  FIG. 1  are graphs for recognizing whether a specific compound is removed in sulfur oxides. 
         [0118]    First, in reviewing graph (b) of  FIG. 1 , graph (b) represents an adsorption/desorption characteristic of a first sulfur oxides, and it can be seen that a sulfur concentration is actively changed with a large quantity approximately in the first temperature section. That is, it may be understood that the large quantity of the first sulfur oxides is desorbed in the first temperature section. Here, the first sulfur oxides is sulfur oxides of ammonium sulfate (NH 4 ) 2 SO 4 ). 
         [0119]    In the meantime, in reviewing graph (c) of  FIG. 1 , graph (c) represents an adsorption/desorption characteristic of a second sulfur oxides, and it can be seen that a sulfur concentration is actively changed with a large quantity approximately in the second temperature section. That is, it may be understood that the large quantity of the second sulfur oxides is desorbed in the second temperature section. However, it can be seen that the quantity of sulfur oxides adsorbed and desorbed is relatively small compared to the first sulfur oxides. Here, the second sulfur oxides is sulfur oxides of copper sulfate (CuSO 4 ). 
         [0120]    That is, when a catalytic device is uniformly regenerated in accordance with one specific kind of temperature environment like the related art, some sulfur oxides may be removed, but the other sulfur oxides may not be removed. Further, when the catalytic device is regenerated in accordance with a high temperature, most of the sulfur oxides may be removed, but in order to create a high temperature environment, there is a problem in that the large quantity of fuel is consumed. 
         [0121]    In this respect, the present disclosure may remove sulfur oxides by differently setting a cycle, in which the regeneration of the apparatus for post-processing exhaust gas is performed, and a temperature implemented when the reproduction is performed according to a component of the sulfur oxides. This will be described with reference to  FIG. 2 . 
         [0122]      FIG. 2  is a diagram for describing the apparatus for post-processing exhaust gas for removing sulfur oxides according to an exemplary embodiment of the present disclosure. 
         [0123]    Information on an engine operation time  110 , an engine fuel consumption quantity  120 , a vehicle trip distance  130 , and sulfur oxides produced quantity  140  may be collected, and the collected information may be stored in an input unit  100 . A reproduction cycle and a temperature environment of a catalytic device are set for each information. Here, the reproduction cycle and the temperature environment of the catalytic device may also be controlled by collecting information on any one or information on two or more of the engine operation time  110 , the engine fuel consumption quantity  120 , the vehicle trip distance  130 , and the sulfur oxides produced quantity  140 . 
         [0124]    For example, a time calculation, a fuel quantity calculation, a distance calculation, and sulfur oxides quantity calculation are performed for information on the engine operation time  110 , the engine fuel consumption quantity  120 , the vehicle trip distance  130 , and the sulfur oxides produced quantity  140 , respectively, and a first processing unit  310  or a second processing unit  320  sets the regeneration cycle and the regeneration temperature according to a result of each calculation. 
         [0125]    The first processing unit  310  allows the regeneration to be performed at a relatively low temperature (T-L) compared to the second processing unit  320 , and sets a short regeneration cycle (short term DeSOx). 
         [0126]    The second processing unit  320  allows the regeneration to be performed at a relatively high temperature (T-H) compared to the first processing unit  310 , and sets a long regeneration cycle (long term DeSOx). 
         [0127]    Regeneration environment information (regeneration cycle and regeneration temperature) set by the first and second processing units  310  and  320  is provided to sulfur oxides removal evaluating unit  410 . 
         [0128]    The sulfur oxides removal evaluating unit  410  will be described. In the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure, the low temperature (T-L) and the high temperature (T-H) are set, but construction machinery (vehicle) substantially has a large load variation width, so that it may be substantially impossible to uniformly maintain the temperature control, and thus a slight oscillation is inevitably generated. When the variation width is large, so that a regeneration temperature is implemented to be lower than the set temperature, the operation of removing sulfur oxides (DeSOx) may not be properly performed. Accordingly, each of the low temperature and the high temperature may have a minimum effective temperature reference. The sulfur oxides removal evaluating unit  410  evaluates time only when a currently controlled temperature of exhaust gas (a temperature of an SCR inlet) is higher than the minimum effective temperature, and when the evaluated time is larger than a predetermined effective time, for which the operation of removing the sulfur oxides (DeSOx) is performed, the sulfur oxides removal evaluating unit  410  determines that the operation of removing the sulfur oxides (DeSOx) is successful and terminates to increase the temperature of the exhaust gas. The effective time, for which the operation of removing the sulfur oxides (DeSOx) is performed, may be set to 5 minutes to 30 minutes. 
         [0129]    Actually, only when the effective time taken for the operation of removing the sulfur oxides is longer than 5 minutes, it is determined that the sulfur oxides is stably removed. The effective time less than 5 minutes may be understood as a time insufficient to remove the sulfur oxides. In the meantime, the effective time may be set within 30 minutes. The reason is that when the effective time is excessively long, fuel is additionally and continuously injected even though the sulfur oxides is sufficiently removed, thereby causing waste of the fuel. 
         [0130]    Then, after the sulfur oxides removal evaluating unit  410  is operated, the monitoring unit  420  is operated. 
         [0131]    The monitoring unit  420  prevents the sulfur oxides from being permanently removed, and allows the operation of removing the sulfur oxides to be performed only when a specific condition is satisfied. The specific condition means that any one element of information or a plurality of elements of information among the four kinds of information including the monitored information on the engine operation time  110 , the engine fuel consumption quantity  120 , the vehicle trip distance  130 , and the sulfur oxides produced quantity  140  reaches a predetermined value. 
         [0132]    The monitoring unit  420  sets a comparison target value (refer to each reference value) for each of the four elements of information, and stops the operation of removing the sulfur oxides and notifies a driver of a failure of the operation of removing the sulfur oxides when the sulfur oxides is not properly performed even though the specific information exceeds a corresponding comparison target value. For example, the monitoring unit  420  displays a visually or audibly recognizable message. That is, the monitoring unit  420  may generate an alarm or output a message capable of notifying the failure on a dashboard. 
         [0133]    Further, as described above, when the operation of removing the sulfur oxides is failed, the apparatus may induce a user to manually perform the operation of removing the sulfur oxides according to an intention of the user. That is, the apparatus induces the user to operate a manual switch disposed in a manual control unit  270  for manually performing the regeneration of the catalytic device. The manual control unit  270  is a switch capable of manually initiating the operation of removing the sulfur oxides according to an intention of a worker. 
         [0134]    In the meantime, there may be a case where any one condition among the four kinds of elements of information is satisfied, and during the performance of the regeneration of the catalytic device under any one temperature environment between the low temperature (T-L) and the high temperature (T-H), another condition is additionally satisfied. In this case, even though the later condition is satisfied, the regeneration of the catalytic device is already being performed, so that it is possible to restrict the regeneration of the catalytic device from being continuously and newly performed. 
         [0135]    The restriction of the regeneration of the catalytic device from being continuously performed will be additionally described. Under any one temperature environment between the low temperature (T-L) and the high temperature (T-H), after the regeneration operation of the catalytic device is finished, the apparatus may have a pause time. The pause time is a time from the precedent regeneration operation of the catalytic device to a next regeneration operation of the catalytic device. That is, the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure may newly start the regeneration operation of the catalytic device after the pause time elapses. However, when the excessively high concentration of sulfur oxides is detected by an unknown reason, the apparatus may also exceptionally perform the regeneration of the catalytic device. 
         [0136]    In the meantime, the regeneration environment information (the regeneration cycle and the regeneration temperature) set by the first and second processing units  310  and  320  may pass through the sulfur oxides removal evaluating unit  410  or may be directly provided to sulfur oxides removal operating unit  500 . 
         [0137]    The sulfur oxides removal operating unit  500  gives a command to regenerate the catalytic device for substantially removing the sulfur oxides by the set regeneration environment information. When it is not necessary to perform the operation of removing the sulfur oxides, the operation of removing the sulfur oxides is terminated ( 510 ). 
         [0138]    The regeneration environment information is set by the short regeneration cycle (short term DeSOx) and the long regeneration cycle (long term DeSOx), so that a time, at which the catalytic device is to be regenerated, is set, and when a time reaches the short regeneration cycle, the regeneration of the catalytic device is performed under the low temperature environment. Similarly, when a time reaches the long regeneration cycle, the regeneration of the catalytic device is performed under the high temperature environment. 
         [0139]    An exhaust gas temperature control unit  520  performs the command given from the sulfur oxides removal operating unit  500 , and when the regeneration environment information contains the command containing the low temperature information (T-L), a low temperature control unit  521  performs a low temperature control so that an appropriate quantity of fuel is injected so as to implement the low temperature environment when the regeneration of the catalytic device is performed. Similarly, when the regeneration environment information contains the command containing the high temperature information (T-H), a high temperature control unit  522  performs a low temperature control so that a relatively large quantity of fuel is injected so as to implement the high temperature environment when the regeneration of the catalytic device is performed. 
         [0140]    Hereinafter, an exemplary embodiment, in which the regeneration environment information is set by using information on the engine operation time, will be described with reference to  FIG. 3 .  FIG. 3  is a diagram for describing an example, in which the regeneration cycle and a regeneration temperature of the catalytic device are set based on information on an engine operation time in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
         [0141]    The engine operation time  110  is information about a time for which an engine is operated. The information on the engine operation time  110  is provided to a time calculation processing unit  210 , and the time calculation processing unit  210  evaluates each of a short operation time and a long operation time, and compares and determines each of the evaluated short operation time and the evaluated long operation time. More particularly, the time calculation processing unit  210  includes a first time processing unit  212  and a second time processing unit  216 . A short time reference value  214  is set in the first time processing unit  212  and a long time reference value  218  is set in the second time processing unit  216 . 
         [0142]    The long time reference value  218  may be set to a relatively longer time than the short time reference value  214 . More particularly, the long time reference value  218  may be set to be 1.5 times to 20 times the short time reference value  214 . 
         [0143]    In the meantime, the short time reference value  214  makes the operation of removing the sulfur oxides be performed under the low temperature environment, and as illustrated in  FIG. 1 , the short time reference value  214  reflects the adsorption and the desorption of the relatively large quantity of sulfur oxides in the first temperature section that is the low temperature (T-L). 
         [0144]    Similarly, the long time reference value  218  makes the operation of removing the sulfur oxides be performed under the high temperature environment, and as illustrated in  FIG. 1 , the long time reference value  218  reflects the adsorption and the desorption of the relatively small quantity of sulfur oxides in the second temperature section that is the high temperature (T-L). That is, the regeneration of the catalytic device is more frequently performed in the first temperature section, in which the quantity of oxide sulfur is relatively large, compared to the second temperature section. 
         [0145]    On the other hand, the long time reference value  218  is set to be 1.5 times or more the short time reference value  214 , so that it is possible to periodically remove the activated sulfur oxides in the second temperature section. To additionally describe, the relatively small quantity of sulfur oxides is produced in the second temperature section compared to the first temperature section, but when the sulfur oxides is continuously evaluated, the performance of the apparatus for post-processing exhaust gas deteriorates, so that the sulfur oxides needs to be appropriately removed at an appropriate time. 
         [0146]    Further, the long time reference value  218  is set to be 20 times or less the short time reference value  214 . Accordingly, in order to implement a temperature environment of the second temperature section that is a relatively high temperature compared to the first temperature section, the fuel injection quantity is increased, but the long time reference value  218  is restricted to be 20 times or less the short time reference value  214 , so that it is possible to prevent the second temperature section from being frequently implemented and prevent the fuel from being excessively wasted. 
         [0147]    For example, when it is assumed that the short time reference value  214  is set to 150 hrs and the long time reference value  218  is set to 500 hrs, information on the engine operation time  110  is continuously evaluated in the first and second time processing units  212  and  216 . Then, when the evaluated operation time information reaches 150 hrs set as the short time reference value  214 , a low temperature control command is given to the first processing unit  310 . Then, the operation time information is continuously evaluated, and when the evaluated operation time information reaches 500 hrs set as the long time reference value  218 , a high temperature control command is given to the second processing unit  320 . 
         [0148]    In the meantime, the low temperature control command may be generated just after the high temperature control command is generated, but in this case, the low temperature (T-L) control command may be ignored. The reason of ignoring the low temperature (T-L) control command is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together. 
         [0149]    In the meantime, when the low temperature control command is generated, the engine operation time evaluated in the first time processing unit  212  is initialized. Similarly, when the high temperature (T-H) control command is generated, the engine operation time evaluated in the second time processing unit  216  is initialized. Further, when the engine operation time evaluated in the second time processing unit  216  is initialized, the engine operation time evaluated in the first time processing unit  212  may be also initialized together, and the reason is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together, as described above. 
         [0150]    Hereinafter, an exemplary embodiment, in which the regeneration environment information is set by using information on an engine fuel consumption quantity, will be described with reference to  FIG. 4 .  FIG. 4  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of the catalytic device are set based on information on an engine fuel consumption quantity in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
         [0151]    The engine fuel consumption quantity  120  is information on a degree of fuel consumed by an engine. Information on the engine fuel consumption quantity  120  is provided to a fuel quantity calculation processing unit  220 , and the fuel quantity calculation processing unit  220  evaluates each of a small consumption quantity and a large consumption quantity and compares and determines each of the evaluated small consumption quantity and the evaluated large consumption quantity. More particularly, the fuel quantity calculation processing unit  220  includes a first fuel quantity processing unit  222  and a second fuel quantity processing unit  226 . A small quantity reference value  224  is set in the first fuel quantity processing unit  222 , and a large quantity reference value  228  is set in the second fuel quantity processing unit  226 . 
         [0152]    The large quantity reference value  228  may be set to a relatively larger quantity than the small quantity reference value  224 . More particularly, the large quantity reference value  228  may be set to be 1.5 times to 10 times the small quantity reference value  224 . 
         [0153]    In the meantime, the small quantity reference value  224  makes the operation of removing the sulfur oxides be performed under the low temperature environment, and as illustrated in  FIG. 1 , the small quantity reference value  224  reflects the adsorption and the desorption of the relatively large quantity of sulfur oxides in the first temperature section that is the low temperature (T-L). 
         [0154]    Similarly, the large quantity reference value  228  makes the operation of removing the sulfur oxides be performed under the high temperature environment, and as illustrated in  FIG. 1 , the large quantity reference value  228  reflects the adsorption and the desorption of the relatively small quantity of sulfur oxides in the second temperature section that is the high temperature (T-L). That is, the regeneration of the catalytic device is more frequently performed in the first temperature section, in which the quantity of oxide sulfur is relatively large, compared to the second temperature section. 
         [0155]    On the other hand, the large quantity reference value  228  is set to be 1.5 times or more the small quantity reference value  224 , so that it is possible to periodically remove the activated sulfur oxides in the second temperature section. To additionally describe, the relatively small quantity of sulfur oxides is produced in the second temperature section compared to the first temperature section, but when the sulfur oxides is continuously evaluated, the performance of the apparatus for post-processing exhaust gas deteriorates, so that the sulfur oxides needs to be appropriately removed at an appropriate time. 
         [0156]    Further, the large quantity reference value  228  is set to be 10 times or less the small quantity reference value  224 . Accordingly, in order to implement a temperature environment of the second temperature section that is a relatively high temperature compared to the first temperature section, the fuel injection quantity is increased, but the large quantity reference value  228  is restricted to be 10 times or less the small quantity reference value  224 , so that it is possible to prevent the second temperature section from being frequently implemented and prevent the fuel from being excessively wasted. 
         [0157]    For example, when it is assumed that the small quantity reference value  224  is set to 2,000 L and the large quantity reference value  228  is set to 10,000 L, information on the engine fuel consumption quantity  120  is continuously evaluated in the first and second fuel quantity processing units  222  and  226 . Then, when the evaluated fuel consumption information reaches 2,000 L set as the small quantity reference value  224 , a low temperature control command is given to the first processing unit  310 . Then, the fuel consumption information is continuously evaluated, and when the evaluated fuel consumption information reaches 10,000 L set as the large quantity reference value  228 , a high temperature control command is given to the second processing unit  320 . 
         [0158]    In the meantime, the low temperature control command may be generated just after the high temperature control command is generated, but in this case, the low temperature (T-L) control command may be ignored. The reason of ignoring the low temperature (T-L) control command is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together. 
         [0159]    On the other hand, when the low temperature control command is generated, the information on the engine fuel consumption quantity evaluated in the first fuel quantity processing unit  222  is initialized. Similarly, when the control command according to the high temperature (T-H) is generated, the information on the engine fuel consumption quantity evaluated in the second fuel quantity processing unit  226  is initialized. Further, when the engine fuel consumption quantity of the second fuel quantity processing unit  226  is initialized, the engine fuel consumption quantity of first fuel quantity processing unit  222  may be initialized together, and the reason is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together, as described above. 
         [0160]    Hereinafter, an exemplary embodiment, in which the regeneration environment information is set by using information on a vehicle trip distance, will be described with reference to  FIG. 5 .  FIG. 5  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of the catalytic device are set based on information on a vehicle trip distance in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
         [0161]    The vehicle trip distance  130  is information on a degree of trip of a vehicle. Information on the vehicle trip distance  130  is provided to a distance calculation processing unit  230 , and the distance calculation processing unit  230  evaluates a short distance and a long distance and compares and determines each of the evaluated short distance and the evaluated long distance. More particularly, the distance calculation processing unit  230  includes a first distance processing unit  232  and a second distance processing unit  236 . A short distance reference value  234  is set in the first distance processing unit  232  and a long distance reference value  238  is set in the second distance processing unit  236 . 
         [0162]    The long distance reference value  238  may be set to relatively larger than the short distance reference value  234 . More particularly, the long distance reference value  238  may be set to be 1.5 times to 5 times the short distance reference value  234 . 
         [0163]    In the meantime, the short distance reference value  234  makes the operation of removing the sulfur oxides be performed under the low temperature environment, and as illustrated in  FIG. 1 , the short distance reference value  234  reflects the adsorption and the desorption of the relatively large quantity of sulfur oxides in the first temperature section that is the low temperature (T-L). 
         [0164]    Similarly, the long distance reference value  238  makes the operation of removing the sulfur oxides be performed under the high temperature environment, and as illustrated in  FIG. 1 , the long distance reference value  238  reflects the adsorption and the desorption of the relatively small quantity of sulfur oxides in the second temperature section that is the high temperature (T-L). That is, the regeneration of the catalytic device is more frequently performed in the first temperature section, in which the quantity of oxide sulfur is relatively large, compared to the second temperature section. 
         [0165]    On the other hand, the long distance reference value  238  is set to be 1.5 times or more the short distance reference value  234 , so that it is possible to periodically remove the activated sulfur oxides in the second temperature section. To additionally describe, the relatively small quantity of sulfur oxides is produced in the second temperature section compared to the first temperature section, but when the sulfur oxides is continuously evaluated, the performance of the apparatus for post-processing exhaust gas deteriorates, so that the sulfur oxides needs to be appropriately removed at an appropriate time. 
         [0166]    Further, the long distance reference value  238  may be set to be 5 times or less the short distance reference value  234 . Accordingly, in order to implement a temperature environment of the second temperature section that is a relatively high temperature compared to the first temperature section, the fuel injection quantity is increased, but the long distance reference value  238  is restricted to be 5 times or less the short distance reference value  234 , so that it is possible to prevent the second temperature section from being frequently implemented and prevent the fuel from being excessively wasted. 
         [0167]    For example, when it is assumed that the short distance reference value  234  is set to 5,000 km and the long distance reference value  238  is set to 25,000 km, information on the vehicle trip distance  130  is continuously evaluated in the first and second distance processing units  232  and  236 . Then, when the evaluated trip distance information reaches 5,000 km set as the short distance reference value  234 , a low temperature control command is given to the first processing unit  310 . Then, the trip distance information is continuously evaluated, and when the evaluated trip distance information reaches 25,000 km set as the long distance reference value  238 , a high temperature control command is given to the second processing unit  320 . 
         [0168]    In the meantime, the low temperature control command may be generated just after the high temperature control command is generated, but in this case, the low temperature (T-L) control command may be ignored. The reason for ignoring the low temperature control command is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together. 
         [0169]    In the meantime, when the low temperature control command is generated, information on an engine trip distance evaluated in the first distance processing unit  232  is initialized. Similarly, when the high temperature (T-H) control command is generated, information on an engine trip distance evaluated in the second distance processing unit  236  is initialized. Further, when the engine trip distance amount of the second distance processing unit  236  is initialized, the engine trip distance amount of the first distance processing unit  232  may also be initialized together, and the reason is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together, as described above. 
         [0170]    Hereinafter, an exemplary embodiment, in which the regeneration environment information is set by using information on sulfur oxides produced quantity, will be described with reference to  FIG. 6 .  FIG. 6  is a diagram for describing an example, in which a regeneration cycle and a regeneration temperature of the catalytic device are set based on information on sulfur oxides produced quantity in the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure. 
         [0171]    The sulfur oxides produced quantity  140  is information on a degree of quantity of sulfur oxides produced. Information on the sulfur oxides produced quantity  140  is provided to sulfur oxides quantity calculation processing unit  240 , and the sulfur oxides quantity calculation processing unit  240  evaluates the information on the sulfur oxides produced quantity  140  according to the form of catalyst and compares and determines the evaluated information on the sulfur oxides produced quantity  140 . More particularly, the sulfur oxides quantity calculation processing unit  240  determines a degree of sulfur oxides produced with reference to DOC inlet exhaust gas temperature information  142  and SCR inlet exhaust gas temperature information  144 . Accordingly, it is possible to more accurately recognize a degree of sulfur oxides, which needs to be actually removed. 
         [0172]    The sulfur oxides quantity calculation processing unit  240  includes a DOC calculation processing unit  250  and an SCR calculation processing unit  260 . 
         [0173]    The DOC calculation processing unit  250  includes a DOC sulfur oxides storage quantity calculating unit  252 , and sulfur oxides quantity reference value  256  is set in the DOC calculation processing unit  250 . The DOC sulfur oxides storage quantity calculating unit  252  calculates a degree of sulfur oxides stored in the DOC based on the sulfur oxides produced quantity information collected from the sulfur oxides produced quantity  140  and the DOC inlet exhaust gas temperature information  142 . That is, since the sulfur oxides may be naturally desorbed and removed, or absorbed and stored according to the DOC inlet exhaust gas temperature, the DOC inlet exhaust gas temperature information is referred. 
         [0174]    Then, the information on the sulfur oxides quantity calculated in the DOC calculation processing unit  250  is provided to sulfur oxides quantity processing unit  258 . 
         [0175]    The sulfur oxides quantity provided from the DOC calculation processing unit  250  is evaluated in the sulfur oxides quantity processing unit  258 , and the sulfur oxides quantity processing unit  258  compares and determines the evaluated sulfur oxides quantity with sulfur oxides quantity reference value  256 . When the evaluated sulfur oxides quantity reaches the sulfur oxides quantity reference value  256 , the sulfur oxides quantity processing unit  258  gives the low temperature control command to the first processing unit  310 . Then, the information on the sulfur quantity evaluated in the sulfur oxides quantity processing unit  258  is initialized after the low temperature control command is generated. The sulfur oxides reference value  256  may be set to, for example, 20 g. That is, the sulfur oxides quantity processing unit  258  determines whether the evaluated sulfur oxides quantity reaches 20 g, and when the evaluated sulfur oxides quantity reaches 20 g, the sulfur oxides quantity processing unit  258  initializes the information on the evaluated sulfur oxides quantity and gives the low temperature control command. 
         [0176]    When the low temperature control command is given, the information on the sulfur oxides quantity evaluated in each of the DOC sulfur oxides storage quantity calculating unit  252  and the sulfur oxides quantity processing unit  258  is initialized. 
         [0177]    The SCR calculation processing unit  260  calculates first and second sulfur oxides quantities based on the sulfur oxides produced quantity  140 , the SCR inlet exhaust gas temperature information  144 , and the information on the sulfur oxides quantity calculated by the DOC sulfur oxides storage quantity calculating unit  252 . The SCR calculation processing unit  260  calculates each of the first sulfur oxides quantity and the second sulfur oxides quantity. 
         [0178]    The first sulfur oxides quantity is calculated by collecting a first sulfur oxides adsorption characteristic  261   a , a first sulfur oxides desorption characteristic  261   b , the sulfur oxides produced quantity  140 , the SCR inlet exhaust gas temperature information  144 , and the information on the sulfur oxides quantity calculated by the DOC sulfur oxides storage quantity calculating unit  252 . The reason is that the first sulfur oxides quantity is changed and stored according to a temperature environment and an originally existing first sulfur oxides quantity. 
         [0179]    In the meantime, a first sulfur oxides storage quantity processing unit  264   a  refers to a first sulfur oxides quantity reference value  266   a . The first sulfur oxides quantity reference value  266   a  may be set to, for example, 25 g. That is, a first sulfur oxides quantity processing unit  268   a  determines whether the evaluated first sulfur oxides quantity reaches 25 g, and when the evaluated first sulfur oxides quantity reaches 25 g, the first sulfur oxides quantity processing unit  268   a  initializes the information on the evaluated first sulfur oxides quantity and gives the low temperature control command. 
         [0180]    When the low temperature control command is given, the information on the first sulfur oxides quantity evaluated in each of the first sulfur oxides storage quantity processing unit  264   a  and the first sulfur oxides quantity processing unit  268   a  is initialized. 
         [0181]    Similarly, a second sulfur oxides storage quantity processing unit  264   b  calculates a second sulfur oxides quantity. The second sulfur oxides storage quantity processing unit  264   b  calculates the second sulfur oxides quantity by collecting a second sulfur oxides adsorption characteristic  262   a , a second sulfur oxides desorption characteristic  262   b , the sulfur oxides produced quantity  140 , the SCR inlet exhaust gas temperature information  144 , and the information on the sulfur oxides quantity calculated by the DOC sulfur oxides storage quantity calculating unit  252 . The reason is that the second sulfur oxides quantity is changed and stored according to a temperature environment and an originally existing second sulfur oxides quantity. 
         [0182]    In the meantime, a second sulfur oxides storage quantity processing unit  264   b  refers to a second sulfur oxides quantity reference value  266   b . The second sulfur oxides quantity reference value  266   b  may be set to, for example, 10 g. That is, the second sulfur oxides quantity processing unit  268   b  determines whether the evaluated second sulfur oxides quantity reaches 10 g, and when the evaluated second sulfur oxides quantity reaches 10 g, the second sulfur oxides quantity processing unit  268   b  initializes the information on the evaluated second sulfur oxides quantity and gives the command according to the high temperature (T-H). 
         [0183]    When the high temperature control command is given, the information on the second sulfur oxides quantity evaluated in each of the second sulfur oxides storage quantity processing unit  264   b  and the second sulfur oxides quantity processing unit  268   b  is initialized. 
         [0184]    In the meantime, the low temperature control command may be generated just after the high temperature control command is generated, but in this case, the low temperature (T-L) control command may be ignored. The reason of ignoring the low temperature (T-L) control command is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together. 
         [0185]    On the other hand, when the control command according to the high temperature (T-H) is generated, the information on the sulfur oxides quantity evaluated in each of the DOC sulfur oxides storage quantity calculating unit  252  and the sulfur oxides quantity processing unit  258  is initialized, and the information on the first sulfur oxides quantity evaluated in each of the first sulfur oxides storage quantity processing unit  264   a  and the first sulfur oxides quantity processing unit  268   a  may be initialized together. The reason is that when the high temperature environment is created and the operation of removing the sulfur oxides is performed, the sulfur oxides, which is activated to be adsorbed/desorbed at a relatively low temperature, is removed together. 
         [0186]    The sulfur oxides caused from the fuel and the engine oil is adsorbed to a catalyst in the form of sulfur oxides to degrade performance, and has a characteristic in that an adsorption rate of the sulfur oxides to the catalyst is different according to the kind of catalyst and the form of sulfur oxides. 
         [0187]    Accordingly, the apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure may separate and control a regeneration cycle and a regeneration temperature of the apparatus for post-processing exhaust gas even though the sulfur oxides has a different characteristic according to the form of sulfur oxides, thereby removing most of the sulfur oxides. 
         [0188]    Further, since the amount of components of the sulfur oxides removed at a high temperature is relatively smaller than the amount of components of the sulfur oxides removed at a low temperature, it is possible to prevent the waste of fuel consumed when removing the sulfur oxides by setting a cycle implementing a high temperature to be long and frequently setting a cycle implementing a low temperature. 
         [0189]    Further, it is possible to prevent the waste of additionally consumed fuel by ignoring a control cycle resulting from a low temperature when a high temperature is implemented. 
         [0190]    The exemplary embodiments of the present disclosure have been described with reference to the accompanying drawings, but those skilled in the art will understand that the present disclosure may be implemented in another specific form without changing the technical spirit or essential feature thereof. 
         [0191]    Accordingly, it will be understood that the aforementioned exemplary embodiments are described for illustration in all aspects and are not limited, and it should be interpreted that the scope of the present disclosure shall be represented by the claims to be described below, and all of the changes or modified forms induced from the meaning and the scope of the claims, and an equivalent concept thereof are included in the scope of the present disclosure. 
         [0192]    The apparatus for post-processing exhaust gas for removing the sulfur oxides according to the exemplary embodiment of the present disclosure may be used for removing sulfur oxides in a catalytic device when being regenerated.