Abstract:
The present invention discloses a dust removing and coding method for an active coke regeneration apparatus. When the active coke regeneration apparatus is operating, the method includes the following: generating two negative pressure regions respectively at a discharge end and a feeding end; sucking out leaked vapour and dust by means of the negative regions; and cooling down the active coke regeneration apparatus by using gas flow generated by the negative pressure. Moreover, the present invention provides a device for implementing the method as described above.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention generally relates to material processing apparatus, more particularly, to a method for removing dust and cooling for an active coke regeneration apparatus. Also, the present invention relates to a device for implementing the above method. 
         [0003]    2. Description of the Related Art 
         [0004]    Active coke filtration and adsorption for treating waste water or sewage is one newly developed method for treating waste water or sewage. The active coke filtration and adsorption method is used to perform pre-treatment for water from polluted urban water sources, for removing contaminants, fungus, odor, and chroma from the water, so that the treated water reaches first class water source in terms of water-quality standards. The above pre-processed water is transported to city water supply plant where the water is further treated by a traditional process comprising the steps of coagulation, sedimentation, filtration and disinfection, ensuring that the quality of the water supplied to city dwellers can reach the latest city water supply national standard. 
         [0005]    The urban sewage from bio-chemical treatment is deeply treated by the active coke filtration and adsorption method, for removing contaminants, fungus, odor, and chroma from the sewage, so that water quality of the treated sewage reaches class III surface water standard in table 1 (basic item standard values therein) of &lt;&lt;Environment Quality Standard of Surface Water&gt;&gt; (GB 3838-2002). 
         [0006]    The urban sewage after bio-chemical treatment is deeply treated by the active coke filtration and adsorption method, so that water quality of the treated sewage reaches industrial water standard or national industrial pollutant emission standard. 
         [0007]    After treating the waste water and sewage, the active coke typically is regenerated by a rotary regeneration apparatus. The rotary regeneration apparatus includes a drum, a supporting ring, a supporting roller, a gear ring, a drive motor, a thrust roller wheel, a wheel belt, a heating chamber, a feeding chamber, a discharge chamber, a vapour inlet, a sealing device, or the like. Because the drum in the rotary regeneration apparatus has an opening with a large diameter, it results in the problems such as shape error (for example, roundness, eccentric and so on) and repeatedly axial movements caused by expanding with heat and contracting with cold upon operating. Thus, the traditional sealing device cannot achieve the effect of fully sealing. During regeneration of the active coke, a mixed vapour and powders of the active coke would be leaked out from the sealing device at the connecting locations between the drum and the feeding chamber, or between the drum and the discharge chamber, wherein main constituent of the mixed vapour is water vapour. This results in heavy odor, and large amounts of powder and dust in a regeneration workshop. As a result, it causes harm as following: 
         [0008]    1) pollution to environments of the workshop; 
         [0009]    2) danger to health of operators in the workshop: 
         [0010]    3) loss of the active coke 
         [0011]    4) increasing wear of the relevant devices, since the powders of the active coke fall onto the supporting roller and the gear rings; 
         [0012]    5) degrade of safety operation of the drive motor, because the powders of the active coke enter into the drive motor. 
       SUMMARY OF THE INVENTION 
       [0013]    In view of the above, an object of the present invention is to remove or alleviate at least one aspect of the above problems and defects in the prior arts. 
         [0014]    An object of the present invention is to provide a dust removing and cooling for an active coke regeneration apparatus. 
         [0015]    Another object of the present invention is to provide a device for implementing the method as described above. 
         [0016]    In order to achieve the above object, there is provided a dust removing and cooling method for an active coke regeneration apparatus, when the active coke regeneration apparatus is operating, 
         [0017]    generating two negative pressure regions respectively at a discharge end and a feeding end; 
         [0018]    sucking out leaked-out vapour and dust by means of the negative regions; and 
         [0019]    cooling down the active coke regeneration apparatus by using gas flow generated by the negative pressure. 
         [0020]    According to another aspect of the invention, there is provided a device for implementing the above method of the present invention comprises: 
         [0021]    a feeding chamber and a discharge chamber, respectively provided at two opposite ends of the active coke regeneration apparatus; 
         [0022]    a front mechanical room, located between the feeding chamber and a combustion chamber; 
         [0023]    a rear mechanical room, located between the discharge room and the combustion chamber, wherein the combustion room is between the front mechanical room and the rear mechanical room; 
         [0024]    a drum, extending from the feeding chamber to the discharge chamber; 
         [0025]    a spacer plate, provided between the feeding chamber and the front mechanical room, forming a front negative pressure dust collecting chamber, and a ventilation pipe is provided in the front mechanical room, an air inlet of the ventilation pipe is located an upper part of the front mechanical room, and an air outlet of the ventilation pipe is provided in the front negative pressure dust collecting chamber; 
         [0026]    another spacer plate, provided between the discharge chamber and the rear mechanical room, forming a rear negative pressure dust collecting chamber, and a ventilation pipe is provided in the rear mechanical room, an air inlet of the ventilation pipe is located an upper part of the rear mechanical room, and an air outlet of the ventilation pipe is provided in the rear negative pressure dust collecting chamber; 
         [0027]    two dust collecting ports, respectively provided on top of the front and rear negative pressure dust collecting chambers and connected to a dust collecting apparatus by respective dust collecting pipelines; and 
         [0028]    a vapour outlet, provided at a side of the feeding chamber, and connected with an induced draft fan. 
         [0029]    Specifically, sealing devices are installed inside and outside of a connecting location of the drum with the feeding chamber, and at a connecting location of the drum with the discharge chamber. 
         [0030]    Preferably, a combustion apparatus is arranged outside the combustion chamber. 
         [0031]    In one embodiment, a retention ring is mounted onto one end of the drum within the discharge chamber, and a striker plate in a semicircular shape is provided at an upper part of the drum. 
         [0032]    More particularly, the front and rear mechanical rooms both are mounted with a supporting ring, a supporting roller, a ventilation pipe, a service door and a ventilation hole. 
         [0033]    More preferably, cleaning doors are respectively located beneath the feeding chamber, at a lower part of the front negative pressure dust collecting chamber and at a lower part of the rear negative pressure dust collecting chamber. 
         [0034]    In another embodiment, a discharge end of the drum is connected with a drive motor. 
         [0035]    Preferably, the drive motor, the induced draft fan, the dust collecting apparatus, a water supplying pump and a pressure sensor all are connected with a control cabinet. 
         [0036]    More preferably, the vapour outlet of the discharge chamber is installed with a pressure sensor, the vapour outlet is connected to a vapour inlet of a condenser, and a discharge port at another end of the condenser is connected with a tri-phase separator by a mixed vapour pipeline, wherein a vapour inlet on top of the tri-phase separator is connected with the induced draft fan, nozzles are installed within the condenser, respectively at a side of the vapour outlet, in a middle of the condenser, and at a side of a discharge port in the condenser, on an axis of the condenser, the nozzles being connected with a water supplying pump by a water supplying pipe. 
         [0037]    In the present invention, two negative pressure dust collecting chambers are respectively provided between the feeding chamber and the front mechanical room, or between the discharge chamber and the rear mechanical room, which are located at two ends of the active coke regeneration apparatus. The dust collecting ports of the front and rear negative pressure dust collecting chambers are connected with the dust collecting apparatus by the pipelines. When the regeneration apparatus is in operation, the dust collecting apparatus starts to operate, so that negative pressure is formed within the front and rear negative pressure dust collecting chambers. The vapour and dust leaked from the connecting parts between the feeding chamber and the drum or between the discharge chamber and the drum, enter the front and rear negative pressure dust collecting chambers, and then are sucked out by the dust collecting apparatus. At this time, the gas flow generated by the negative pressure is used to cool down the active coke regeneration apparatus. Because the mechanical rooms and the regeneration workshop all are under atmospheric conditions, it prevents the vapour and dust entering the mechanical rooms and the regeneration workshop, under the action of the pressure difference. In addition, the dust gas is discharged from the vapour outlet and then enters the condenser. Most of the water vapour in the dust gas is converted into the condensed water in the condenser. The dust contained in the dust gas under scouring action of the condensed water and the cooling water, flows into the tri-phase separator via the mixed vapour pipeline and the gas-liquid inlet. Under the action of the fan, the cooling water, the condensed water and the dust flow into the sedimentation tank from the solid-liquid outlet in the tri-phase separator, whereas the remaining gas is discharged from the gas outlet above the tri-phase separator. Therefore, the present invention achieves the following advantages: 
         [0038]    1) avoiding pollution to environment of the workshop; 
         [0039]    2) ensuring health of operators in the workshop; 
         [0040]    3) reducing the loss of the active coke, since the leaked active coke is collected by the dust collecting apparatus; 
         [0041]    4) decreasing wear of the relevant devices, since the powders of the active coke is prevented from falling onto the supporting roller and the gear rings, or the like; 
         [0042]    5) ensuring safety operation and service lifetime of the drive motor, because the powders of the active coke is prevented from entering the drive motor; and 
         [0043]    (6) avoiding the dust of the dust gas attaching to the wall of the mixed vapour pipeline, which would cause the blocking of the mixed vapour pipeline, and does not discharge the dust gas in the drum in time. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0044]      FIG. 1  is a structural schematic view of the device in accordance with the present invention. 
           [0045]      FIG. 2  is a perspective view of the device in accordance with the present invention. 
           [0046]      FIG. 3  is a sectional view cut along a direction A of  FIG. 1 . 
       
    
    
       [0047]    List of reference numbers of the main components in the accompanying drawings: 
         [0048]      1  dust collecting apparatus 
         [0049]      2  dust collecting pipeline 
         [0050]      3  mixed vapour pipeline 
         [0051]      4  dust collecting port 
         [0052]      5  rear negative pressure dust collecting chamber 
         [0053]      6  striker plate 
         [0054]      7  discharge chamber 
         [0055]      8  sealing device for the discharger chamber 
         [0056]      9  vent pipe 
         [0057]      10  retention ring 
         [0058]      11  air outlet 
         [0059]      12  rear cleaning door 
         [0060]      13  drive motor 
         [0061]      14  supporting roller 
         [0062]      15  supporting ring 
         [0063]      16  air inlet 
         [0064]      17  spacer plate 
         [0065]      18  rear mechanical room 
         [0066]      19  gear ring 
         [0067]      20  drum 
         [0068]      21  regeneration apparatus 
         [0069]      22  combustion room 
         [0070]      23  front mechanical room 
         [0071]      24  sealing device of the feeding chamber 
         [0072]      25  middle cleaning door 
         [0073]      26  front cleaning door 
         [0074]      27  front negative pressure dust collecting chamber 
         [0075]      28  pressure sensor 
         [0076]      29  feeding chamber 
         [0077]      30  vapour outlet 
         [0078]      31  tri-phase separator 
         [0079]      32  induced draft fan 
         [0080]      33  ventilation hole 
         [0081]      34  combustion apparatus 
         [0082]      35  dust gas 
         [0083]      36  cooling air 
         [0084]      37  control cabinet 
         [0085]      38  service door 
         [0086]      39  condenser 
         [0087]      40  nozzle 
         [0088]      41  defogger 
         [0089]      42  solid-liquid outlet 
         [0090]      43  sedimentation tank 
         [0091]      44  water supplying pump 
         [0092]      45  water supplying pipeline 
         [0093]      46  vapour inlet 
         [0094]      47  discharge port 
         [0095]      48  gas outlet 
         [0096]      49  gas-liquid inlet 
       DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0097]    As shown in  FIGS. 1-3 , they are schematic views of a device for dust collecting and cooling an active coke regeneration apparatus of the present invention. A feeding chamber  29 , a discharge chamber  7 , a front mechanical room  23  and a rear mechanical room  18  are provided at two opposite ends of the active coke regeneration apparatus  21 . 
         [0098]    A front negative dust collecting chamber  27  is located in middle of the feeding chamber  29  and the front mechanical room  23 , whereas a spacer plate  17  is arranged between the feeding chamber  29  and the front negative pressure dust collecting chamber  27 . 
         [0099]    A rear negative dust collecting chamber  5  is located in middle of the discharge chamber  7  and the rear mechanical room  18 , whereas a spacer plate  17  is arranged between the discharge chamber  7  and the rear negative pressure dust collecting chamber  5 . 
         [0100]    A combustion room  22  is located in middle of the front mechanical room  23  and the rear mechanical room  18 , whereas a combustion apparatus  34  is disposed outside of the combustion room  22 . 
         [0101]    The drum  20  extends from the feeding chamber  29  to the discharge chamber  7  in a fore-and-aft direction. Inside and outside of a connecting location of the drum  20  with the feeding chamber  29  both are provided with a sealing device  24  for the feeding chamber. A connecting location of the drum  20  with the discharge chamber  7  is provided with a sealing device  8  for the discharge chamber, at a side of the rear negative pressure dust collecting chamber  5 . The sealing devices  8  and  24  of the present invention are configured to be labyrinth sealing devices and/or scale type sealing device as well known in the art. 
         [0102]    A retention ring  10  is installed onto one end of the drum  20  inside of the discharge chamber  7 , and a tripper plate  6  in a semicircular shape is installed above a discharge port of the drum  20 . 
         [0103]    A supporting ring  15 , a supporting roller  14 , a vent pipe  9 , a service door  38  and a ventilation hole  33  all are mounted within the front mechanical room  23 . 
         [0104]    The rear mechanical room  18  is provided with a supporting ring  15 , a supporting roller  14 , a gear ring  19 , a drive motor  13 , a vent pipe  9 , a service door  39  and a ventilation hole  33 . 
         [0105]    A cleaning door  26  is located beneath the feeding chamber  29 , a side of which is provided with a vapour outlet  30 . The vapour outlet  30  is mounted with a pressure sensor  28 . At the outside of the vapour outlet  30 , a condenser  39  is installed. The condenser  39  is connected to a tri-phase separator  31  by a mixed vapour pipeline  3 . The tri-phase separator  31  is provided with an induced draft fan  32  and a gas outlet  48  is arranged on top of the tri-phase separator  31 . A gas-liquid inlet  49  and a solid-liquid outlet  42  are respectively located at the lower part of the tri-phase separator  31 , and a defogger  41  and a nozzle  40  are installed within the tri-phase separator  31 . The gas outlet  48  is connected with the induced draft fan  32 , and the nozzle  40  is connected to a water supplying pump  44  by a water supplying pipe  45 , and the solid-liquid outlet  42  is connected with the sedimentation tank  43 . The defogger  41  of the present invention is folded plate type or screen type defogger as well known in the art. 
         [0106]    A vapour inlet  46  is provided at one end of the condenser  39 , and a discharge port  47  is provided at the other end of the condenser  39 . Along an axis of the condenser  39 , nozzles  40  are respectively arranged within the condenser  39 , at a side of the vapour net  46 , in the middle of the condenser  39  and at a side of the discharge port  47 , and the nozzles  40  are connected with the water supplying pump  44  by the water supplying pipe  45 . 
         [0107]    Dust collecting ports  4  are installed on top of the front and rear negative pressure dust collecting chambers  27  and  5 , and connected with the dust collecting apparatus  1  by a dust collecting pipeline  2 . A cleaning door  25  is located at the lower part of the front negative pressure dust collecting chamber  27 , whereas a cleaning door  12  is located at the lower part of the rear negative pressure dust collecting chamber  5 . 
         [0108]    The drive motor  13 , the induced draft fan  32 , the dust collecting apparatus  1 , the pressure sensor  28  are connected with a control cabinet  37 . 
         [0109]    When the regeneration apparatus  21  is in operation, water, organic matters or the like contained in the active coke in the drum  20  vaporize and perform pyrolysis, generating a dust gas  35  consisted of water, non-condensable combustible gas, powders of the active coke and so on. 
         [0110]    When the induced draft fan  32  of the tri-phase separator  31  is operating, a negative pressure is created at the vapour outlet  30  of the feeding chamber  29  by the tri-phase separator  31 , the mixed vapour pipeline  3  and the condenser  39 . The negative pressure at the vapour outlet  30  is controlled by rotational speed of the induced draft fan  32  which is controlled and adjusted by signals from the pressure sensor via the control cabinet  37 . 
         [0111]    When the dust collecting apparatus  1  is running on, a negative pressure is generated at the front and rear negative pressure dust collecting chambers  27  and  5  respectively by the dust collecting pipeline  2 . 
         [0112]    The dust gas  35  in the drum  20  entrained with dust flows toward the feeding chamber  29  and the discharge chamber  7 , under the action of the pressure caused by gas expansion. 
         [0113]    Most of the dust gas  35  flowing into the feeding chamber  29 , under the action of negative pressure of the vapour outlet  30 , flows into the tri-phase separator  31  through the vapour outlet  30 , the condenser  39  and the mixed vapour pipeline  3 , so as to be purified, condensed, and separated. A small part of the dust gas  35  flowing into the feeding chamber  29  leaks out from gaps between the sealing device  24  and the drum  20 , enters the front negative pressure dust collecting chamber  27 , and flows into the dust collecting apparatus  1  through the dust collecting port  4  and the dust collecting pipeline  2  under the action of the negative pressure of the dust collecting apparatus  1 , so as to be purified. 
         [0114]    Under the negative pressure from the vapour outlet  30 , most of the dust gas  35  in the drum  20  flows toward the feeding chamber  29 . When the drum  20  is under a positive pressure, the discharge chamber  7  is also filled up with the dust gas  35 . This dust gas  35  would leak out into the rear negative pressure dust collecting chamber  5  from the gaps between the sealing device  8  and the drum  20 , and flow into the dust collecting apparatus  1  through the dust collecting port  4  and the dust collecting pipeline  2 , under the negative pressure of the dust collecting apparatus  1 , so as to be purified. 
         [0115]    The drum  20  passes from the front mechanical room  23  to the rear mechanical room  18 . The thermal energy from the surface of the drum  20  will heat up the front and rear mechanical rooms  23  and  18 , so as to increase the temperature thereof. In order to avoid the temperatures within the front and rear mechanical rooms  23  and  18  too high, and affecting the normal operation of the supporting roller  14  and the drive motor  13 , or the like, a ventilation pipe  9  is installed within the front and rear mechanical rooms  23  and  18 . An air inlet  16  of the ventilation pipe  19  is located at an upper part of the front and rear mechanical rooms  23  and  18 , and an air outlet  11  of the ventilation pipe  9  is located within the front and rear negative pressure dust collecting chambers  23  and  5 . When the regeneration apparatus  21  is in operation, cooling air  36  enters the front and rear mechanical rooms  23  and  18  from below through ventilation holes  33  onto a service door  38 , and at the same time flows upwardly within the front and rear mechanical rooms  23  and  18 . Then such cooling gas enters the ventilation pipe  9  from the air net  16 , flows into the front and rear negative pressure dust collecting chambers  23  and  5  from the air outlet  11  of the ventilation pipe  9 , and then flows into the dust collecting apparatus  1  through the dust collecting port  4  and the dust collecting pipeline  2 , under the negative pressure of the dust collecting apparatus  1 , so as to be purified. 
         [0116]    In order to avoid the dust within the feeding chamber  29  falling onto the drum  20  and entering the front negative pressure dust collecting chamber  27  along with the rotation of the drum  20 , the sealing device  24  is installed onto an inner wall of the feeding chamber  29 . In order to avoid the dust within the discharge chamber  7  falling onto the drum  20  and entering the rear negative pressure dust collecting chamber  5  along with the rotation of the drum  20 , the retention ring  10  is installed onto the drum  20  within the discharge chamber  7 . The semicircular shaped striker plate  6  is installed onto a wall of the discharge chamber  7  above the drum  20 . On one hand, it is possible to reduce the dust falling onto the drum  20 ; on the other hand, it is also possible to reduce the dust leaking out into the rear negative pressure dust collecting chamber  5  through the gaps between the sealing device  8  and the drum  20 . 
         [0117]    When the regeneration apparatus  21  is operating, in order to prevent the dust in the dust gas  35  from attaching to the wall of the mixed vapour pipeline  3 , thus resulting in frequent blocking to it, and to avoid not discharging the dust gas  35  in time, a condenser  39  is mounted outside the vapour outlet  30 . The water vapour in the dust gas  35  which flows into the condenser  39 , becomes condensed water under the action of water mist ejected from the nozzle  40 . The dust in the dust gas  35  enters the tri-phase separator  31  from the discharge port  47 , the mixed vapour pipeline  3  and the gas-liquid inlet  49 , under scouring action of the water mist, the condensed water and the cooling water ejected from the nozzle  40 ; and then after further condensation and mist removing treatment of the nozzle  40  in the tri-phase separator  31  and the defogger  4 , the dust as well as the water flow into the sedimentation tank  43  from the solid-liquid outlet  42  in the tri-phase separator  31 , whereas the remaining dry gas is discharged from the gas outlet  48  above the tri-phase separator  31 . The water in the sedimentation tank  43  is transported to the nozzle  40  through the water supplying pipeline  45  by the water pump  44 . 
         [0118]    When the regeneration apparatus  21  is operating, the control cabinet  37  controls the operation of the induced draft fan  32  and the dust collecting apparatus  1  in accordance with the signals from the pressure sensor  28 , so that the drum  20 , the feeding chamber  29 , the front negative pressure dust collecting chamber  27 , the drum  20 , the discharge chamber  7  and the rear negative pressure dust collecting chamber  5  mutually keep a normal pressure difference between. 
         [0119]    (1) It is possible to avoid that when the rotational speed of the induced draft fan  32  becomes too high, the negative pressure in the feeding chamber  29  and the drum  20  becomes too high, so that the air flows into the discharge chamber  7 , the drum  20 , the feeding chamber  29  through the gaps between the sealing device  24  of the front negative pressure dust collecting chamber  27  and the drum  20 , and the gaps between the sealing device  8  of the rear negative pressure dust collecting chamber  5  and the drum  20 . In the above way, it would cause erosion of the active coke and increase discharge amount of the dust. 
         [0120]    (2) It is possible to avoid that when the suction force of the dust collecting apparatus  1  becomes too large, the negative pressures in the front and rear negative pressure dust collecting chambers  27  and  5  becomes too high. Therefore, this would increase the amount of the dust flowed through the gaps between the sealing device  24  and the drum  20 , and between the sealing device  8  and the drum  20 . 
         [0121]    With the dust removing method and device as described above, when the regeneration apparatus is operating, by controlling the negative pressures in the front and rear negative pressure dust collecting chambers  27  and  5 , the drum  20 , the feeding chamber  29 , the front negative pressure dust collecting chamber  27 , the drum  20 , the discharge chamber  7  and the rear negative pressure dust collecting chamber  5  mutually keep a normal pressure difference therebetween. The dust leaked out from the connecting parts between the drum  20  and the feeding chamber  29 , and between the drum  20  and the discharge chamber  7  are collected, preventing the dust pollution in the regeneration workshop. Meanwhile, this arrangement can effectively prevent the dust flowing into the front and rear mechanical rooms  23  and  18 , and thus maintaining surfaces of the mechanical equipment dean. Further, it is effective to avoid blocking of the transporting pipeline for the dust gas. The temperature of the mechanical equipment room is reduced by the flow of the cooling gas, and thus protecting the normal operation of the equipment.