Abstract:
The present invention makes it possible to prevent the spontaneous combustion of coal while causing oxygen to be adsorbed to the surface of the coal in an efficient manner. A coal deactivation processing device includes: a rotary kiln body provided rotatably into which coal and a processing gas are supplied; a feed pipe provided so as to be able to rotate along with the rotary kiln body), extending along a lengthwise direction of the rotary kiln body (103), and having a coolant flowing therein, and a protruding portion provided to the outer circumferential section of the feed pipe so as to protrude toward the rotation direction of the feed pipe. The feed pipe and the protruding portion are arranged so as to pass through a coal layer resulting from the accumulation of coal within the rotary kiln body when the rotary kiln body rotates.

Description:
TECHNICAL FIELD 
       [0001]    The present invention pertains to a coal deactivation processing device performing deactivation processing of coal with a processing gas that contains oxygen. 
       BACKGROUND ART 
       [0002]    Low-grade coal (low rank coal) such as lignite or sub-bituminous coal having high moisture content has low calorific power per unit weight. Therefore, modification to decrease oxygen reactivity is performed by heating in a low-oxygen atmosphere, along with drying and dry distillation. As such, modified coal having high calorific power per unit weight is produced while preventing spontaneous combustion. 
       CITATION LIST 
     Patent Literatures 
       [0003]    Patent Document 1: Japanese Unexamined Patent Application Publication No. 2007-237011A 
         [0004]    Patent Document 2: WO/95/13868 
       SUMMARY OF THE INVENTION 
     Technical Problem 
       [0005]    A device has been developed as a coal deactivation processing device for performing deactivation processing of dry distilled coal obtained by drying and dry distillation of the above-described low-grade coal. The device is provided with a rotary kiln and feed pipes. Dry distilled coal and a processing gas are supplied into the rotary kiln. The feed pipes are arranged within the rotary kiln neighboring each other in the circumferential direction. A coolant flows in each deed pipe. 
         [0006]    The above-described coal deactivation processing device causes the rotary kiln and the plurality of feed pipes to rotate. As such, the dry distilled coal is agitated by the rotation of the rotary kiln body while the coolant flowing within the feed pipes cools the dry distilled coal. In addition, the plurality of feed pipes pass through an accumulated coal layer of the dry distilled coal within the rotary kiln and lift the dry distilled coal higher than a coal layer surface, then drop the dry distilled coal onto the coal layer surface from above, thereby further agitating the dry distilled coal. Then the deactivation processing of the dry distilled coal is performed by the processing gas. The above-described agitation is performed repeatedly while the dry distilled coal is displaced from a base end side to a tip end side of the rotary kiln, such that the dry distilled coal is gradually pulverized. 
         [0007]    In the above-described coal deactivation processing device, having a large pipe diameter for the feed pipes leads to a large volume of the dry distilled coal being loaded onto the feed pipes in correspondence with the size of the feed pipes. This causes overly advanced pulverization of the dry distilled coal. There has been a possibility that this pulverized dry distilled coal may accompany the processing gas supplied within the rotary kiln and be ejected to outside the system along with the processing gas, thereby decreasing the yield of deactivation processed coal. Conversely, having a small pipe diameter for the feed pipes leads to a small volume of the dry distilled coal being loaded onto the feed pipes in correspondence with the size. This causes a decrease in the contact efficacy between the dry distilled coal and the processing gas. There has been a possibility that the deactivation processing of the dry distilled coal may not be performed in an efficient manner. 
         [0008]    In consideration of this background, the present invention has been made in order to solve the above-described problem, and an object thereof is to provide a coal deactivation processing device enabling oxygen to be adsorbed to the surface of the coal in an efficient manner while preventing spontaneous combustion of the coal. 
       Solution to Problem 
       [0009]    A coal deactivation processing device according to a first aspect of the invention and solving the above-described problem performs deactivation of coal with a processing gas that includes oxygen. The coal deactivation processing device includes a kiln body provided rotatably into which the coal and the processing gas are supplied, with a feed pipe provided so as to be able to rotate along with the kiln body, extending along a lengthwise direction of the kiln body, and having a coolant flowing therein, and with a protruding portion provided on an outer circumferential section of the feed pipe, protruding in a direction of rotation of the feed pipe, and having a hat shape in a radial cross-section of the feed pipe. The feed pipe and the protruding portion are arranged so as to pass through an accumulated coal layer of the coal within the kiln body upon rotation of the kiln body. 
         [0010]    A coal deactivation processing device according to a second aspect of the invention and solving the above-described problem is the coal deactivation processing device according to the first aspect described above, where the protruding portion has a V shape in the radial cross-section of the feed pipe. Also, a vertex of the protruding portion matches a path of a central axis of the feed pipe. 
         [0011]    A coal deactivation processing device according to a third aspect of the invention and solving the above-described problem is the coal deactivation processing device according to one of the first and second aspects described above, where the protruding portion has a symmetrical shape in a plane passing through the vertex of the protruding portion and the central axis of the feed pipe. Also, an angle formed by a straight line joining respective intersections of the feed pipe with two tangent lines tangent to the feed pipe passing through the vertex of the protruding portion, and by one of the two tangent lines, is greater than an angle of repose. 
         [0012]    A coal deactivation processing device according to a fourth aspect of the invention and solving the above-described problem is the coal deactivation processing device according to any one of the first to third aspects described above, where a distance between the vertex of the protruding portion and the central axis of the feed pipe is equal to or less than twice a radius of the feed pipe. 
       Advantageous Effects of Invention 
       [0013]    According to the coal deactivation processing device pertaining to the present invention, the protruding portion having the hat shape is provided on the outer circumferential section of each of the feed pipes so as to protrude toward the direction of rotation of the respective feed pipe. The feed pipes and the protruding portions are arranged so as to pass through the accumulated coal layer of the coal in the kiln body upon rotation of the kiln body. As such, the coal is agitated by the rotation of the kiln body while the coal is also cooled by the coolant flowing in the feed pipes. In addition, a predetermined volume of the coal is lifted up by the feed pipes and the protruding portions higher than the coal layer surface within the rotary kiln body and then dropped from above, thus enabling agitation of the coal and providing a suitable form of opportunities for contact between the coal and the processing gas. As a result, the spontaneous combustion of the coal may be prevented while causing oxygen to be adsorbed to the surface of the coal in an efficient manner. Furthermore, in comparison to a situation where the protruding portions are not provided on the feed pipes, the overall length of the kiln body may be made shorter, thus enabling miniaturization of the device. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0014]      FIG. 1  is an overall configuration view of an embodiment of a coal deactivation processing device pertaining to the present invention. 
           [0015]      FIG. 2  is a magnified view of a cross section taken along line II-II of  FIG. 1 . 
           [0016]      FIG. 3  is a magnified view of a feed pipe provided on the coal deactivation processing device. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0017]    An embodiment of the coal deactivation processing device pertaining to the present invention is described with reference to the drawings. However, the present invention is not limited merely to the following embodiment as described with reference to the drawings. 
         [0018]    The embodiment of the coal deactivation processing device pertaining to the present invention is described with reference to  FIG. 1  to  FIG. 3 . 
         [0019]    As illustrated in  FIG. 1 , a coal deactivation processing device  100 , performing deactivation processing of dry distilled coal  1 , is equipped with a hopper  101  receiving the dry distilled coal  1  and with a screw feeder  102  provided with a base end side being continuous with a feed aperture of the hopper  101  and serving as rotational transport means of transporting the coal  1  within the hopper  101  from one end side (the base end side) to another end side (a tip end side) via rotation. 
         [0020]    The tip end side of the screw feeder  102  is continuous with a base end side of a rotary kiln body (kiln body)  103  having a tubular shape. The base end side of the rotary kiln body  103  is continuous with a base end side casing  111  via a sealing device  108 . A gas intake aperture  111   a  taking in a processing gas  13  is provided on a top portion of the base end side casing  111 . The gas intake aperture  111   a  is connected to a tip end side of a processing gas supply pipe  121  supplying the processing gas  13 . A blower  127  and a heating device  128  are provided in the path of the processing gas supply pipe  121 . 
         [0021]    A tip end side of an air supply pipe  122  supplying air  11  and a tip end side of a nitrogen supply pipe  123  supplying nitrogen gas  12  are respectively connected to the base end side of the processing gas supply pipe  121 . The base end side of the air supply pipe  122  is open to the atmosphere. The base end side of the nitrogen supply pipe  123  is connected to a nitrogen supply source  124 , such as a nitrogen gas tank. Flow rate regulation valves  125 ,  126  are respectively provided in the paths of the air supply pipe  122  and the nitrogen supply pipe  123 . 
         [0022]    The tip end side of the rotary kiln body  103  is continuous with a tip end side casing  112  via sealing devices  109   a,    109   b.  A gas ejection aperture  112   a  ejecting used processing gas  14  is provided on a top portion of the tip end side casing  112 . The gas ejection aperture  112   a  is connected to a base end side of a processing gas ejection pipe  131  ejecting the used processing gas  14 . A temperature sensor  131   a  is provided in the path of the processing gas ejection pipe  131 . A chute  112   b  dropping and ejecting deactivation processed coal (upgraded coal)  3  is provided on a bottom portion of the tip end side casing  112 . 
         [0023]    A projecting portion  104  having a ring shape is provided on the tip end side and the base end side of an outer circumferential section of the rotary kiln body  103 . The projecting portion  104  is supported by a roller  105 . A gear  106  engaging with a gear  107   a  of a drive motor  107  is provided on the outer circumferential section of the rotary kiln body  103 . As a result, the rotary kiln body  103  is made to rotate by the rotation of the gear  107   a  of the drive motor  107 . 
         [0024]    The above-described coal deactivation processing device  100  is further equipped with a cooling device  140 . The cooling device  140  is equipped with a bearing  145  fixed to a side wall portion  103   a  of the tip end side of the rotary kiln body  103 . The cooling device  140  is equipped with a coolant feed header  141  feeding a coolant  21  from outside the system. The coolant feed header  141  is provided on the bearing  145 . The coolant feed header  141  is connected to a feed pipe  142  feeding the coolant  21 . The feed pipe  142  is provided in plurality (for example, as a double pipe) with, for example, eight pipes being connected (see  FIG. 2 ). The cooling device  140  is equipped with a coolant ejection header  146  ejecting used coolant  22  that has passed through the feed pipes  142  to outside the system. 
         [0025]    The plurality of feed pipes  142  are arranged, as illustrated in  FIG. 1  and  FIG. 2 , within the rotary kiln body  103  so as to neighbor each other with equal spacing along a circumferential direction of the rotary kiln body  103 . The plurality of feed pipes  142  are arranged at respective positions so as to, upon rotation of the rotary kiln body  103 , pass through an accumulated coal layer of the coal  2  despite a fill ratio of the coal  2  within the rotary kiln body  103  being from 10 to 15%, for example. In addition, the plurality of feed pipes  142  are arranged such that a distance D 1  from a respective central axis C 2  of each of the feed pipes  142  to a central axis C 1  of the rotary kiln body  103  is consistently equal. The plurality of feed pipes  142  extend in parallel to the central axis C 1  of the rotary kiln body  103  within the rotary kiln body  103 , and extend across the rotary kiln body  103  from the tip end side to the base end side. As a result, the temperature of a region where the coal  2  undergoes deactivation processing by the processing gas  13  supplied within the rotary kiln body  103  is adjusted by the coolant  21  flowing within the feed pipes  142  to a temperature at which spontaneous combustion of the coal  2  does not occur. 
         [0026]    The plurality of feed pipes  142  are arranged so as to pass through the side wall portion  103   a  of the rotary kiln body  103 . The plurality of feed pipes  142  are each supported by support jigs (not illustrated in the drawings) arranged at a plurality of locations in a lengthwise direction. As a result, the plurality of feed pipes  142  are made to rotate about the central axis C 1  of the rotary kiln  103  along with the rotary kiln  103  upon rotation of the rotary kiln  103 . 
         [0027]    Here, the parameters of the above-described feed pipes  142  are described with reference to  FIG. 2  and  FIG. 3 . 
         [0028]    In  FIG. 2 , a direction of rotation A is a direction of rotation of the rotary kiln body  103 . A path L 1  is followed by the central axis C 2  of each of the plurality of feed pipes  142 , and a tangent line L 2  is tangent to the path L 1 . In  FIG. 2  and  FIG. 3 , a bisector line L 3  indicates a protruding portion  143 , described later. In  FIG. 3 , tangent lines L 4 , L 5  are tangent to the feed pipe  142  passing through a vertex  143   c  of the protruding portion  143 . A support line L 11  passes through a point of contact P 1  between the feed pipe  142  and the tangent line L 5  and through a point of contact P 2  between the feed pipe  142  and the tangent line L 4 . Support lines L 12 , L 13  respectively pass through the central axis C 2  of the feed pipe  142  and the points of contact P 1 , P 2 . An angle α is an acute angle formed by the bisector line L 3  and the tangent line L 5  (an inside plane portion  143   a  of a hat) and represents the angle (a hat angle) of the protruding portion. Similarly, an angle β is an acute angle formed by the bisector line L 3  and the support line L 12 . An angle θ is an acute angle formed by the tangent line L 5  and the support line L 11 . Here, the support lines L 11 , L 12 , L 13  form an isosceles triangle with the central axis C 2  at the vertex. Given that the support line L 12  and the tangent line L 5  form a right angle, the angle  13  is thus equal to the angle θ. 
         [0029]    As illustrated in  FIG. 2  and  FIG. 3 , the feed pipe  142  has a circular cross-section in the radial direction. The protruding portion  143  is provided on the outer circumferential section of the feed pipe  142 , and forms a hat shape protruding in the direction of rotation A of the feed pipe  142 . More specifically, the protruding portion  143  forms a V shape as seen in a radial cross-section of the feed pipe  142 . The protruding portion  143  is arranged at a position so as to, similarly to the feed pipe  142 , upon rotation of the rotary kiln body  103 , pass through the accumulated coal layer of the coal  2  despite the fill ratio of the coal  2  within the rotary kiln body  103  being from 10 to 15%, for example. 
         [0030]    The protruding portion  143  includes an inside plane portion  143   a  positioned on a central axis C 1  side of the rotary kiln body  103 , and an outside plane portion  143   b  positioned on an outer circumferential surface side of the rotary kiln body  103 . The inside plane portion  143   a  and the outside plane portion  143   b  are connected at a tip end side. The vertex  143   c  of the protruding portion  143  is positioned at a position matching the path of the central axis C 2  of the feed pipe  142 . As a result, a volume of coal lifted up above a coal layer surface  2   a  by the feed pipe  142  and the protruding portion  143  is decreased in comparison to a situation where the hat shaped protruding portion is not provided, thereby enabling suitable conditions to be provided. These conditions provide appropriate opportunities for contact between the coal  2  and the processing gas  13  by agitation of the coal  2 , thereby enabling the effect of deactivation processing of the coal  2  to be provided in an efficient manner. 
         [0031]    The inside plane portion  143   a  and the outside plane portion  143   b  are positioned with symmetry in a plane passing through a tip portion  143   c  of the protruding portion  143  and the central axis C 2 . That is, the protruding portion  143  is shaped with plane symmetry. In addition, the angle θ formed between the line L 11  and the tangent line L 5  is greater than the angle of repose. Here, the tangent line L 5  is one of the two tangent lines L 4 , L 5  tangent to the feed pipe  142  and passing through the peak  143   c  of the protruding portion  143 . Also, the line L 11  is a straight line joining the points P 2 , P 1  where the tangent lines L 4 , L 5  are tangent to the feed pipe  142 . This is done because having the angle θ be smaller than the angle of repose increases the volume of the coal  2  on the protruding portion  143 , thereby promoting pulverization of the coal  2  and leading to a decreased yield of deactivation processed coal  3 . 
         [0032]    A distance D 2  between the tip portion  143   c  of the protruding portion  143  and the central axis C 2  of the feed pipe  142  is preferably equal to or less than twice the radius of the feed pipe  142 , and more preferably equal to or less than the radius of the feed pipe  142 . This is because having the distance D 2  exceed the above-given upper limit decreases a heat transfer surface area between the coal  2  and the coolant  21  within each of the feed pipes  142 . This leads to a decrease in the rate of heat exchange, enables multiple spaces to be formed between the feed pipes  142  and the protruding portions  143  within the rotary kiln  103 , and decreases the volume of processed coal. 
         [0033]    Here, the feed pipes  142  and the respective protruding portions  143  may be manufactured using a material having no reactivity with the coal  2  and that is thermally resistant, such as steel, for example. 
         [0034]    Furthermore, the above-described coal deactivation processing device  100  preferably satisfies the relationship of formula (1) given below, where a given feed pipe  142  has a radius r 2  and a distance D 1  is defined from the central axis C 1  of the rotary kiln body  103  to the central axis C 2  of the given feed pipe  142 . 
         [0000]       1/50 D1&lt;r2&lt; 1/10 D1   (1)
 
         [0035]    In a situation where the radius r 2  of the feed pipe  142  is equal to or greater than 1/10 D 1  (one-tenth of D 1 ), the pipe diameter of the feed pipe  142  is overly large in comparison to the thickness of the coal layer within the rotary kiln body  103 . Given that the flow of the coal  2  is increased, this leads to the promotion of pulverization of the coal  2 . Conversely, in a situation where the radius r 2  of the feed pipe  142  is equal to or less than 1/50 D 1  (one-fiftieth of D 1 ), the feed pipe  142  is narrow and heat exchange is not possible unless many of the feed pipes  142  are arranged in the layer of the coal  2 . This not only increases equipment costs, but also increases the supply pressure of the coolant  21  supplied to the feed pipes  142 , and consumes a greater amount of power. As a result, satisfying formula (1), given above, enables pulverization of the coal  2  to be constrained, and also enables equipment cost increases and power consumption increases to be constrained. 
         [0036]    In addition, the above-described coal deactivation processing device  100  preferably satisfies the relationship of formula (2), given below, where a distance D 3  is defined between neighboring feed pipes  142 ,  142 . 
         [0000]      2r2&lt;D3&lt;6r2   (2)
 
         [0037]    In a situation where the distance D 3  between the neighboring feed pipes  142 ,  142  is equal to or less than 2r2 (twice the radius r 2  of each of the feed pipes  142 ), then the neighboring feed pipes  142 ,  142  are too close to each other and the coal  2  may bridge the space between the neighboring feed pipes  142 ,  142 . Conversely, in a situation where the distance D 3  between the neighboring feed pipes  142 ,  142  is equal to or greater than 6r2 (six times the radius r 2  of each of the feed pipes  142 ), then a heat transfer surface area between the coolant  21  within the feed pipes  142  and the coal  2  is reduced and as such, the cooling heat transfer surface area may not be secured for the coal  2 . Thus, satisfying formula (2), given above, enables the occurrence of bridging of the space between the neighboring feed pipes  142 ,  142  to be constrained and enables the cooling heat transfer surface area of the coolant  21  within the feed pipes  142  to be secured for the coal  2 . 
         [0038]    In the present embodiment, the processing gas supply pipe  121 , the heating device  128 , the blower  127 , the air supply pipe  122 , the flow rate regulation valve  125 , the nitrogen supply pipe  123 , the flow rate regulation valve  126 , the nitrogen supply source  124 , the base end side casing  111 , the gas intake aperture  111   a,  and the like constitute processing gas supply means. The coolant feed header  141 , the feed pipes  142 , the protruding portion  143 , the bearing  145 , the coolant ejection header  146 , and the like constitute the cooling device  140 , which serves as cooling means. The projecting portion  104 , the roller  105 , the gear  106 , the drive motor  107 , the gear  107   a,  and the like constitute rotation means. The hopper  101 , the screw feeder  102 , and the like constitute coal supply means. The chute  112   b  of the tip end side casing  112  and the like constitute coal ejection means. The tip end side casing  112 , the gas ejection aperture  112   a,  the processing gas ejection pipe  131 , and the like constitute processing gas ejection means. Each of these means and the rotary kiln body  103 , the sealing devices  108 ,  109   a,    109   b,  and the like constitute the coal deactivation processing device  100 . 
         [0039]    Operations centered on the coal deactivation processing device  100  are described next. 
         [0040]    Upon being supplied to the hopper  101 , the coal  1  is transported by the screw feeder  102  within the rotary kiln body  103 . At the other end, the air  11  and the nitrogen gas  12  are supplied to the processing gas supply pipe  121  via the air supply pipe  122  and the nitrogen supply pipe  123  by controlling a degree of aperture of the flow rate regulation valves  125 ,  126  while controlling the operation of the blower  127 . As a result, the processing gas  13  is obtained by combining the air  11  and the nitrogen gas  12  (for example, with an oxygen concentration on the order of from 5 to 10%). The processing gas  13  is heated by the heating device  128  in accordance with temperature data of the used processing gas  14  obtained by the temperature sensor  131   a  so that the temperature inside the rotary kiln body  103  is adjusted to within a range of from 40 to 200° C. The processing gas  13  is then supplied within the rotary kiln body  103  by the processing gas supply pipe  121  via the gas intake aperture  111   a.    
         [0041]    The rotary kiln body  103  is driven to rotate by the rotation of the gear  107   a  of the drive motor  107  being transmitted via the gear  106 . The coal  2  transported within the rotary kiln body  103  along with the rotation of the rotary kiln body  103  is displaced from the base end side to the tip end side of the rotary kiln body  103  while being agitated. At this time, the coal  2  within the rotary kiln body  103  adsorbs the oxygen in the processing gas  13  supplied within the rotary kiln body  103 . The coal  2  thus becomes the deactivation processed coal (upgraded coal)  3  as a result of this oxygen adsorption, and is then transported to outside the system via the chute  112   b.  The coal  2  in the rotary kiln body  103  produces heat by adsorbing the oxygen in the processing gas  13 . The temperature is therefore adjusted by the flow of the coolant  21  within the feed pipes  142  to a temperature at which spontaneous combustion of the coal  2  does not occur. 
         [0042]    The used processing gas (approximately from 50 to 70° C.)  14  that has been used in the deactivation processing of the coal  2  within the rotary kiln body  103  flows in the same direction as the direction of transport of the coal  2 . The used processing gas  14  flows from the gas ejection aperture  112   a  of the tip end side casing  112  provided on the tip end side of the rotary kiln body  103  to the processing gas ejection pipe  131 , and is ejected outside the system via the processing gas ejection pipe  131 . 
         [0043]    Here, in the above-described coal deactivation processing device  100 , the plurality of feed pipes  142  are provided within the rotary kiln body  103  so as to rotate about the central axis C 1  of the rotary kiln body  103  along with the rotary kiln body  103  upon rotation of the rotary kiln body  103  so as to pass through the accumulated coal layer of the coal  2  supplied to the rotary kiln body  103 , and the respective protruding portions  143  are provided on each of the feed pipes  142 . Given the various factors described above, the following operations are further obtained. 
         [0044]    That is, in the present embodiment, the plurality of feed pipes  142  are driven to rotate about the central axis C 1  of the rotary kiln body  103  along with the rotation of the rotary kiln body  103 . Also, upon passing through the coal layer, the coal  2  is lifted by the feed pipes  142  and the respective protruding portions  143  higher than the coal layer surface  2   a.  Here, providing the protruding portion  143  on each of the feed pipes  142  leads to a smaller volume of the coal  2  being lifted higher than the coal layer surface  2   a  than is lifted at the angle of repose of the feed pipes  142 . As a result, providing the protruding portion  143  enables constraint of the pulverization of the coal  2  due to excessive agitation of the coal  2 . 
         [0045]    As a result, according to the coal deactivation processing device  100  pertaining to the present embodiment, the protruding portion  143  is provided on the outer circumferential section of each of the feed pipes  142  so as to protrude toward the direction of rotation A of the respective feed pipe  142 . The feed pipes  142  and the protruding portions  143  are arranged so as to pass through the accumulated coal layer of the coal  2  within the rotary kiln body  103  upon rotation of the rotary kiln body  103 . As such, the coal  2  is agitated by the rotation of the rotary kiln body  103  while the coal  2  is also cooled by the coolant  21  flowing in the feed pipes  142 . In addition, a predetermined volume of the coal  2  is lifted up by the feed pipes  142  and the protruding portions  143  higher than the coal layer surface  2   a  within the rotary kiln body  103  and dropped from above, thus enabling agitation of the coal  2  and providing a suitable form of opportunities for contact between the coal  2  and the processing gas  13 . As a result, the spontaneous combustion of the coal  2  may be prevented while causing oxygen to be adsorbed to the surface of the coal  2  in an efficient manner. Furthermore, in comparison to a situation where the hat-shaped protruding portions are not provided on the feed pipes, the overall length of the rotary kiln body  103  may be made shorter, thus enabling miniaturization of the device. 
       OTHER EMBODIMENTS 
       [0046]    Here, the protruding portion  143  provided on each of the plurality of feed pipes  142  is not limited to a single shape. Two or more types of the protruding portion  143  may also be provided. 
         [0047]    The coal deactivation processing device  100  has been described above as being equipped with eight of the feed pipes  142 . However, the quantity of the feed pipes is not limited to eight. The coal deactivation processing device may also be equipped with seven or fewer and with nine or more of the feed pipes. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           1 ,  2 ,  3  Coal 
           11  Air 
           12  Nitrogen gas 
           13 ,  14  Processing gas 
           21 ,  22  Coolant 
           100  Coal deactivation processing device 
           101  Hopper 
           102  Screw feeder 
           103  Rotary kiln body (Kiln body) 
           104  Projecting portion 
           105  Roller 
           106  Gear 
           107  Drive motor 
           107   a  Gear 
           108  Sealing device 
           109   a,    109   b  Sealing device 
           111  Base end side casing 
           111   a  Gas intake aperture 
           112  Tip end side casing 
           112   a  Gas ejection aperture 
           112   b  Chute 
           121  Processing gas supply pipe 
           122  Air supply pipe 
           123  Nitrogen supply pipe 
           124  Nitrogen supply source 
           125 ,  126  Flow rate regulation valve 
           127  Blower 
           128  Heating device 
           131  Processing gas ejection pipe 
           131   a  Temperature sensor 
           140  Cooling device 
           141  Coolant feed header 
           142  Feed pipe 
           143  Protruding portion 
           143   a  Inside plane portion 
           143   b  Outside plane portion 
           143   c  Vertex 
           145  Bearing 
           146  Coolant ejection header 
         A Rotation direction of rotary kiln body 
         C 1  Central axis of rotary kiln body 
         C 2  Central axis of feed pipe 
         D 1  Distance between central axis of rotary kiln body and central axis of feed pipe 
         D 2  Distance between vertex of protruding portion and central axis of feed pipe 
         D 3  Distance between neighboring feed pipes 
         L 1  Path of central axis of feed pipe 
         L 2  Tangent line of path of central axis of feed pipe 
         L 3  Bisector line of protruding portion 
         L 4 , L 5  Tangent line to feed pipe passing through vertex of protruding portion 
         L 11  Support line 
         L 12  Line passing through point P 1  and central axis C 2  of feed pipe 
         L 13  Line passing through point P 2  and central axis C 2  of feed pipe 
         P 1 , P 2  Point of contact 
         r 1  Radius of rotary kiln body 
         r 2  Radius of feed pipe 
         α Angle of protruding portion (Hat angle) 
         θ Angle between line L 5  and line  11   
         β Angle between line L 3  and line L 12