JP5766497B2 - CATALYST STRUCTURE, METHOD FOR CLEANING THE SAME, AND METHOD FOR PRODUCING PLATE CATALYST - Google Patents

Description

  The present invention relates to a catalyst structure, a method for cleaning the catalyst structure, and a method for manufacturing a plate catalyst constituting the catalyst structure, and more particularly to an improved technique for efficiently removing dust and the like adhering to the plate catalyst.

Nitrogen oxides (NOx) in exhaust gas discharged from thermal power plants and various factories cause photochemical smog and acid rain. As a technique for removing nitrogen oxides from exhaust gas, for example, a denitration device containing a denitration catalyst is disposed in an exhaust gas flue, and ammonia (NH ₃ ) serving as a reducing agent is placed in the exhaust gas upstream of the denitration device. An exhaust gas denitration method in which nitrogen oxides and ammonia in exhaust gas are selectively reacted with a denitration catalyst by adding them is known.

  By the way, a lot of soot is contained in the exhaust gas discharged from a facility burning coal or heavy oil such as a thermal power plant, and this soot adheres to the surface of the denitration catalyst and gradually accumulates. If soot accumulates on the surface of the denitration catalyst in this way, there is a risk of increasing the pressure loss over time in the denitration device or decreasing the denitration efficiency.

  2. Description of the Related Art Conventionally, a catalyst structure containing a so-called parallel flow type denitration catalyst (hereinafter also referred to as a catalyst layer) in a cylindrical frame is provided in the flue of exhaust gas containing a large amount of dust. A large number of the catalyst structures are provided in a stack direction of the flue. Known parallel flow type catalyst layers include those formed in a honeycomb shape and those in which a plurality of plate-like catalysts are arranged in parallel. In particular, the catalyst layer made of a plate-like catalyst has a structure in which the pressure loss of exhaust gas is smaller than that of a honeycomb-like catalyst layer, and soot accumulation is less likely to occur.

  However, even when such a catalyst layer made of a plate catalyst is used, fine dust adheres to the surface of the plate catalyst due to a decrease in the flow rate of exhaust gas passing through the catalyst layer or scattering of massive ash to the catalyst layer. However, when it accumulates, the original performance of the catalyst may not be exhibited. Further, the catalyst performance of the catalyst deteriorates over time due to poisoning components (alkali metal, alkaline earth metal, etc.) in the exhaust gas.

  On the other hand, regarding the deterioration of the catalyst performance due to the adhesion of the dust, it is possible to recover the catalyst performance by removing the dust from the plate catalyst. In addition, regarding catalyst performance degradation due to catalyst degradation, the catalyst can be reused by activating the degraded catalyst. However, in order to activate the plate catalyst, as a previous step, the plate catalyst It is necessary to remove dust from the surface. Thus, in order to recover the catalytic performance of exhaust gas, it is essential to remove dust from the surface of the plate catalyst.

  Conventionally, when removing dust from a plate-shaped catalyst, for example, the welded portion of the frame body formed by bending into a rectangular tube shape is peeled off, the frame body is removed, and the plate-shaped catalyst is removed from the catalyst layer accommodated in the frame body. This is a very time-consuming operation, such as turning the sheets one by one, removing dust adhering to the surface of the plate catalyst with a vacuum, and then stacking them again to form a catalyst layer and placing it in a frame. I was going.

  On the other hand, a slit into which the edge of the plate catalyst is inserted is formed on the opposing inner peripheral surface of the frame body formed in a rectangular tube shape, and the edges of both ends of the plate catalyst are inserted into the slit, respectively. By doing so, a catalyst structure is disclosed in which the plate-like catalysts are respectively held in parallel within the frame (see Patent Document 1). In this way, by supporting the plate-like catalysts one by one in the frame, for example, only a predetermined plate-like catalyst can be easily extracted, so that the plate-like catalyst can be easily cleaned or replaced.

Japanese Utility Model Publication No. 60-7784

  However, in the case of the catalyst structure of Patent Document 1, the working efficiency can be improved when cleaning a small number of plate-shaped catalysts, but when cleaning a large number of plate-shaped catalysts, the plates are separated one by one from the frame. The plate-shaped catalyst must be extracted and cleaned, and the plate-shaped catalyst must be set again one by one in the frame, making it difficult to improve work efficiency.

  An object of the present invention is to efficiently remove dust and the like adhering to the surface of a plate-like catalyst with a simple operation.

  In order to solve the above problems, the present invention provides a catalyst structure in which a plurality of plate catalysts are arranged with gas flow paths formed between adjacent plate catalysts and are accommodated in a cylindrical frame. In the body, the plurality of plate catalysts are supported in the frame body by inserting support rods into the plurality of through holes formed in each plate catalyst, and fixing both ends of the support rods to the frame body. It is characterized by being made.

  According to such a configuration, when removing dust or the like adhering to the plate-like catalyst, one of the opposing surfaces of the frame body to which both ends of the support rod are fixed is removed from each support rod, and the frame By connecting another support rod to one end of the support rod from which the body surface has been removed and extending the support rod, a plurality of plate catalysts supported by the support rod are moved along the other support rod. Can do. Thereby, since the plate-shaped catalyst can be arranged with a gap between adjacent plate-shaped catalysts being widened, the dust accumulated in the gap can be easily dropped simply by giving it a natural drop or giving a slight vibration. In addition, dust removal can be performed while freely adjusting the interval between adjacent plate catalysts, so that dust adhering to the plate catalyst can be sucked in by vacuum or the like. Furthermore, the plate-like catalyst after dust removal can be easily returned to the original state where the plate-like catalysts overlap each other by pushing back along the support rod and other support rods. Therefore, according to the present invention, it is possible to efficiently remove dust and the like adhering to the surface of the plate-like catalyst with a simple operation. Since each plate catalyst is supported in the frame by at least two support rods, the plate catalyst can be prevented from rotating around the support rods, and a predetermined posture can be maintained.

  By the way, by supporting the plate catalyst with the support rod in this way, it is possible to increase the holding power of the plate catalyst, so that the longitudinal dimension of the plate catalyst extending in the exhaust gas flow direction is long. Can be expected. This is because the exhaust gas treatment performance of the catalyst structure can be improved by elongating the longitudinal dimension. However, in this longitudinal direction, if the length of the plate catalyst exceeds a predetermined length, the laminar flow area of the exhaust gas flowing through the gap between the plate catalysts increases, so that the exhaust gas and the catalyst are sufficiently in contact with each other. Thus, the originally expected catalyst performance may not be obtained.

  For this reason, each plate-like catalyst is formed with gas flow holes communicating with adjacent gas flow paths in addition to the through holes through which the support rods are inserted.

  According to this, exhaust gas comes and goes between the adjacent gas flow paths through the gas flow holes. As a result, since a turbulent flow of exhaust gas is formed in the gas flow path, it is possible to suppress a decrease in catalyst performance due to the generation of a laminar flow of exhaust gas, and it is possible to lengthen the plate-like catalyst.

  Further, the frame body is formed in a rectangular tube shape having four rectangular side plates, and the side plates are rotatably connected to each other by a hinge on any one of the four sides in the axial direction. Shall.

  By connecting the side plates so as to be rotatable with a hinge, the welded portion between the side plates can be reduced, so that the working efficiency can be improved. Also, for example, by connecting a side plate to which one end of the support bar is fixed with a side plate adjacent to the side plate with a hinge, an operation of removing the side plate from one end of the support bar, or an operation of attaching the removed side plate to one end of the support bar Becomes easier.

Moreover, catalyst structure plate catalysts for use in the present invention, after the catalyst was applied to the surface of the flat metal plate, which was plastic working by pressing a mold (press machine), the strip-shaped projections plurality It is manufactured by forming a through hole.

  In this way, for example, it is only necessary to newly provide a part (projection or the like) for forming a through hole in a conventional mold for forming a band-shaped protrusion, and the other parts are manufactured using the same equipment as the conventional one. Therefore, the increase in equipment cost can be suppressed.

  According to the present invention, dust and the like adhering to the surface of the plate catalyst can be efficiently removed with a simple operation.

It is a perspective view of a catalyst structure formed by applying the present invention. It is a figure explaining the method to clean a plate-shaped catalyst in the catalyst structure formed by applying this invention. It is a perspective view of the frame of the catalyst structure formed by applying the present invention. It is a perspective view of the state which opened the frame of the catalyst structure formed by applying this invention. It is a figure which shows other embodiment of the plate-shaped catalyst in the catalyst structure formed by applying this invention. It is a perspective view which shows other embodiment of the catalyst structure formed by applying this invention. It is a figure explaining the method to manufacture the plate-shaped catalyst of the catalyst structure formed by applying this invention. It is a perspective view of the conventional catalyst structure.

  Hereinafter, an embodiment of a catalyst structure to which the present invention is applied will be described with reference to the drawings. In the present embodiment, a catalyst structure including a denitration catalyst will be described. However, the catalyst is not limited to the denitration function, and can be appropriately selected and used.

  First, in order to facilitate understanding of the present invention, the configuration and problems of a conventional catalyst structure corresponding to the present invention will be described.

  As shown in FIG. 8, the conventional catalyst structure 80 includes a catalyst layer 3 formed by laminating a plurality of plate-like catalysts 1 and a rectangular tube-shaped frame 5 surrounding the catalyst layer 3. . Of the both ends of the frame 5 that open, one is an exhaust gas inlet and the other is an exhaust gas outlet. The plate-like catalyst 1 has a denitration catalyst supported on both the front and back surfaces of a rectangular plate material. The plate-like catalyst 1 has corrugated belt-like protrusions 7 that swell both the front and back sides along the longitudinal direction (vertical direction in FIG. 8) extending in the axial direction of the frame 5 (the direction in which the exhaust gas flows). Is provided.

  Each plate-like catalyst 1 is provided with a plurality of (for example, two) strip-like protrusions 7 in parallel with each other. The belt-like projections 7 are arranged at different positions so as not to overlap with the adjacent plate-like catalyst 1. The strip-shaped protrusion 7 of the plate-like catalyst 1 abuts against the flat surface portion of the adjacent plate-like catalyst 1, thereby forming a space in which exhaust gas flows between the plate-like catalyst 1 and the adjacent plate-like catalyst 1. .

  The frame 5 is formed in a rectangular tube shape as a whole, for example, by welding and fixing the sides of two L-shaped plate materials formed by bending a rectangular plate material. The catalyst layer 3 is accommodated and supported in the frame body in a state in contact with the inner surface of the frame body 5.

  Conventionally, in such a catalyst structure 80, when removing dust adhering to and depositing on the plate-like catalyst 1 in the frame 5, first, the welded portions on the two opposite sides of the frame 5 are first peeled off, respectively. 5 is removed. Then, the plate-like catalyst 1 is turned one by one from the catalyst layer 3 accommodated in the frame 5, and the dust accumulated on the plate-like catalyst 1 is manually dropped, and then the adhering dust is sucked in by vacuum. The plate-shaped catalyst after dust removal is stacked again to form a catalyst layer, and the work of placing the catalyst layer in the frame has been performed.

  In the case of the structure in which the plate-like catalysts 1 are laminated in this way, the work load increases because the plurality of plate-like catalysts 1 cannot be cleaned together. On the other hand, in the case of a structure in which a plurality of plate-like catalysts 1 are completely integrated, it is difficult to remove dust trapped in the catalyst only by dry cleaning such as suction or blow, so a honeycomb catalyst or a corrugated catalyst Thus, wet cleaning using a liquid is performed. However, when wet cleaning is performed, a drying process is required after that, which is more laborious than dry cleaning.

  Therefore, in order to efficiently remove dust adhering to the plate catalyst 1 with a simple method, a catalyst structure that can be easily disassembled and assembled while taking advantage of the plate catalyst 1 separated one by one. Body structure is required.

  FIG. 1 shows an example of a catalyst structure 10 to which the present invention is applied.

  The catalyst structure 10 of the present embodiment is different from the configuration of FIG. 8 in that all the plate-like catalysts 13 constituting the catalyst layer 11 are supported by two support rods 15. Each plate-like catalyst 13 is formed with through-holes 17 on the upper and lower sides on one end side in the short direction (left-right direction in FIG. 1). A columnar support rod 15 is inserted into each through-hole 17, and both ends of the support rod 15 are fixed by welding in a state of being inserted into attachment holes 21 through which the frame body 19 penetrates. Since each plate-like catalyst 13 is supported by two support rods 15, the posture is maintained in the frame body 19 without rotating around the support rods 15.

  Next, a method for cleaning the plate catalyst 13 in the catalyst structure 10 will be described. First, in the catalyst structure 10 of FIG. 1, the frame 19 is opened by peeling off the welded portions on the two opposite sides of the frame 19. At this time, both ends of the two support rods 15 are fixed to the two opposite side plates of the frame body 19, respectively, and the support rods 15 are removed from one of the side plates. Thereby, one end of each of the two support rods 15 is fixed to the side plate of the frame body 19 and is supported by the frame body 19 in a cantilever manner. A plurality of plate-like catalysts 13 are supported on each support bar 15.

  Next, one end of another support bar 23 is connected to the tip of each support bar 15 from which the frame 19 is removed. As the other support bar 23, for example, a bar having the same shape and size as the support bar 15 is used, and the end surfaces are fixed coaxially with the support bar 15 by welding or the like. Thus, the support bar 15 to which the other support bar 23 is connected is arranged in the horizontal direction so as to suspend the plurality of plate-like catalysts 13 downward (FIG. 2).

  Next, the plate-like catalyst 13 suspended from the support rod 15 is slid along the other support rod 23 from the support rod 15, so that the plate-like catalyst 13 extends from the support rod 15 to the other support rod 23. It is arranged at a predetermined interval. As a result, the adjacent plate-shaped catalysts 13 are widely spaced from each other, so that the dust 25 accumulated in the gaps falls naturally or falls only by lightly vibrating (arrows in FIG. 2). Further, by adjusting the interval between the adjacent plate-like catalysts 13 so as to increase the interval for easy work, fine dust adhering to the plate-like catalyst 13 can be easily sucked out by vacuum or the like. When the dust removal of the plate catalyst 13 is completed, the plate catalyst 13 can be easily returned to the original catalyst layer 11 state by pushing the plate catalyst 13 back to the original position along the support rod 15 and the other support rods 23. it can.

  Subsequently, after the other support rod 23 is removed from the tip of the support rod 15 and the tip of the support rod 15 is attached to the side plate of the frame body 19 by welding, both ends of the frame body 19 surrounding the catalyst layer 11 are welded together. Assembly is completed.

  By the way, as described above, the frame body 19 of the present embodiment is subjected to the work of removing the welded portions on the opposite sides each time the plate-shaped catalyst 13 is cleaned, and welding it again. On the other hand, as shown in FIG. 3, one side of the four sides extending in the axial direction of the frame 19 may be configured by connecting adjacent side plates with a hinge 27.

  For example, in the frame 19 shown in FIG. 3, first, the side plate A of the side plate A and the side plate C that supports both ends of the support rod 15 (not shown) is removed from the tip of the support rod 15, and the side plate A, Of the side plate B and the side plate D, the welded portion of the side E between the side plate B closer to the support bar 15 is removed.

  Subsequently, as shown in FIG. 4, the side plate C and the side plate D are rotated around the side F by the hinge 27. Thereby, the frame 19 is easily opened, and the plate-like catalyst 13 can be cleaned. On the other hand, when the frame body 19 is assembled, the side plate C and the side plate D are rotated around the side F, and the side plate A and the side plate B are welded and attached at the side E. In this way, one side of the four sides of the frame body 19 is connected to the side plates with a hinge, so that only one side is welded, and the work efficiency of the removal and assembly of the frame body 19 can be improved. .

  In the plate-like catalyst 13 of the present embodiment, the size of the through hole 17 through which the support bar 15 passes is not particularly specified, but it is desirable that the support bar 15 can be easily passed through the through hole 17 during the production. It is desirable that the inner diameter of the through hole 17 is, for example, 1.5 times or more the outer diameter of the cross section of the support rod 15. Although the size of the mounting hole 21 provided in the frame 19 is not particularly specified, the mounting hole 21 is welded in a state where the support rod 15 is inserted. Is desirable. Further, the position and the number of the through holes 17 provided in the plate catalyst 13 are not particularly specified except that two or more through holes 17 are provided. However, considering the stability of the plate catalyst 13, at least the longitudinal direction of the plate catalyst 13 is considered. It is desirable to provide one on each of the upper and lower sides of the exhaust gas, that is, upstream and downstream of the exhaust gas.

  In the conventional catalyst structure (for example, FIG. 8), the plate-shaped catalyst 13 may fall off the frame body 19 due to abnormal vibration during operation of the denitration device or abnormal pressure of the soot blower (dust removal device). According to this embodiment, since all the plate catalysts 13 are supported by the plurality of support rods 15, a situation in which the plate catalyst 13 falls off does not occur.

  By the way, in the case of a structure in which the plate-like catalyst 13 is supported by the support rod 15, for example, an increase in the longitudinal direction of the plate-like catalyst 13 extending in the exhaust gas flow direction can be expected. This is because if the length of the plate-like catalyst 13 can be increased in the exhaust gas flow direction, the denitration rate of the exhaust gas can be improved. However, when the length of the plate catalyst 13 in the longitudinal direction exceeds a predetermined length, the laminar flow area of the exhaust gas flowing through the gap between the adjacent plate catalysts 13 is increased, and the exhaust gas and the catalyst are sufficiently in contact with each other. Therefore, there is a possibility that the originally expected denitration performance of the catalyst cannot be obtained.

  Here, FIG. 5 shows an example of a configuration different from the plate-like catalyst 13 of FIG. The plate-like catalyst 29 is provided with a plurality of gas flow holes 31 at predetermined intervals in the direction intersecting with the flow direction of the exhaust gas, that is, in the short direction of the plate-like catalyst 29. According to this, since the gas flow paths formed between the adjacent plate-shaped catalysts 29 communicate with each other through the gas flow holes 31, the exhaust gas is adjacent to the gas through the gas flow holes 31. Go back and forth between channels. As a result, a turbulent flow of exhaust gas is formed in the gas flow path, so that a reduction in catalyst performance due to the generation of a laminar flow of exhaust gas can be suppressed. Therefore, even if the plate-shaped catalyst is elongated in the longitudinal direction, it is possible to suppress a decrease in catalyst performance.

  In FIG. 5, the gas flow holes 31 having a smaller diameter than the through holes 17 are provided at substantially equal positions in the longitudinal direction of the plate-shaped catalyst 29, but the size and arrangement of the gas flow holes 31 are the same. It is not limited to examples. For example, when elongating the longitudinal direction of the plate-shaped catalyst 29, as shown in FIG. 6, each plate-shaped catalyst 29 is provided with a plurality of gas flow holes 31 having the same size as the through-holes 17, respectively. The support rod 15 may be passed through the gas flow hole 31. In this way, the holding power of the plate catalyst 29 can be increased, and the exhaust gas can flow through the gap between the gas flow hole 31 and the support rod 15. Further, the exhaust gas turbulent flow can be generated by the support rod 15 passed through the gas flow hole 31. Thereby, the fall of the catalyst performance by having lengthened the plate-shaped catalyst 13 can be suppressed.

  In the present embodiment, the band-shaped protrusions 7 of the plate-like catalyst 13 are formed in a corrugated shape, and both side surfaces of the plate-like catalyst 13 are formed so as to be raised. However, the band-like protrusions 7 are raised on at least one surface side. It only has to be formed. In short, it is only necessary to form a gas flow path in which exhaust gas flows between adjacent plate catalysts 13 when the plate catalysts 13 are overlapped. Therefore, even if the plate-like catalyst 13 does not have such a belt-like projection 7, the cross-section of the plate-like catalyst 13 is formed in a stepped shape, a wave shape, a U-shape, an uneven shape, etc. as a whole. Also good.

  In this embodiment, another support rod 23 is used as the rod connected to the tip of the support rod 15. However, this rod supports the plate catalyst 13 supported by the support rod 15. In order to widen the interval between adjacent plate-like catalysts 13, if the plate-like catalyst 13 has a function of sliding with the plate-like catalyst 13 suspended, It is not limited to other support rods 23. For example, when the cross-sectional diameter is smaller than that of the support bar 15, it may not be connected to the support bar 15 coaxially. Moreover, the axial center of the bar may be formed in a curved shape.

  In FIG. 7, the manufacturing method of the plate-shaped catalyst 13 used for the catalyst structure which concerns on this invention is shown. The plate-like catalyst 13 is desired by, for example, applying a catalyst paste 35 to a surface of a metal plate 33 (for example, a stainless steel flat plate) with a roller 37 and pressing it with a die 39 for plastic processing. The shape of As a method of forming the through hole 17 in the plate material 33, as shown in FIG. 7, a protrusion for forming the through hole 17 and the gas flow hole 31 in a conventional mold 39 for forming the band-like protrusion 7 is used. 41 may be added. In this way, since it is not necessary to remodel the conventional equipment, an increase in equipment costs can be suppressed.

  According to the present invention, since the inefficient dust removal process of the prior art can improve the work efficiency of dust removal work without greatly changing the conventional equipment for plate catalyst production, the social effect is great. It can be said.

  Hereinafter, the present invention will be described in detail using specific examples.

Example 1
As an example of the catalyst structure according to the present invention, a catalyst structure was produced by the following steps. A catalyst component is applied to an expanded metal made of stainless steel, and then a band-shaped protrusion is formed with a mold (press machine) as shown in FIG. 7, and a protrusion provided on the mold is used to form a plate-shaped catalyst on one side of the plate-shaped catalyst. Three holes each having a diameter of 15 mm were formed at a position where the center of the hole comes to a position 30 mm from the end in the vertical direction (longitudinal direction) and the horizontal direction (short direction) and an intermediate position (450 mm from the upper end). In addition, a frame body 19 in which holes having a diameter of 12 mm were provided at positions where the holes of the plate-like catalyst were arranged in a straight line was prepared. After laminating the above plate-shaped catalyst having a length of 900 mm and a width of 450 mm, a catalyst structure unitized by passing round steel with a cross-sectional diameter of 9 mm through holes arranged in a straight line and welding the frame body 19 with both ends thereof The body was made.

(Example 2)
As shown in FIG. 6, holes with a diameter of 15 mm were also formed at a position of 450 mm from the upper end of the plate-shaped catalyst of Example 1 at 90 mm intervals (four places) on a horizontal straight line. Separately, a frame 19 was prepared in which holes with a diameter of 12 mm were provided at positions where the holes of the plate catalyst were aligned in a straight line. After laminating the above plate-shaped catalyst having a length of 900 mm and a width of 450 mm on the frame body 19, a round steel having a cross-sectional diameter of 9 mm is passed through the holes arranged in a straight line, and the frame body 19 is welded to both ends thereof. A structure was produced.

(Example 3)
In Example 1, three hinges 27 are provided without welding on one side of the frame 19 on the side opposite to the side where the hole is made in the frame 19, and the other catalyst structure is the same as that in Example 1. Manufactured.

Example 4
As shown in FIG. 5, the same catalyst structure as in Example 3 was manufactured except that holes having a diameter of 5 mm were formed at intervals of 20 mm in a horizontal line at a position 450 mm from the upper end of the plate catalyst of Example 3. did.

(Example 5)
After coal ash was deposited and deposited on the catalyst structures obtained in Examples 1, 2, 3, and 4, the frame was opened and the plate catalyst was suspended as shown in FIG. The coal ash attached to and deposited on the catalyst was dedusted. Thereafter, all the plate-like catalysts were pushed back into the frame and reassembled.

(Comparative Example 1)
A catalyst structure is formed by applying a catalyst component to an expanded metal made of stainless steel, forming a band-shaped protrusion with a press machine, laminating a plate-like catalyst having a length of 900 mm and a width of 450 mm on the frame body 19, and welding the frame body 19. Manufactured.

(Comparative Example 2)
After coal ash was deposited and deposited on the catalyst structure obtained in Comparative Example 1, the frame 19 was opened, and the coal ash deposited and deposited on the catalyst was removed by turning the plate-like catalyst one by one. Thereafter, all the plate-like catalysts were pushed back to the frame body 19 and reassembled.

(Comparison between Examples and Comparative Examples)
About the case where it dust-removed according to Example 5 about Examples 1-4, and the case where dust-removed according to Comparative Example 2 about Comparative Example 1, the ratio of the time required for the dust-removing process and the ratio of the denitration performance were evaluated. Table 1 summarizes the results.

  From the results shown in Table 1, by adopting the cleaning method of the present invention using the catalyst structure of the present invention, it is possible to simplify the removal work of dust adhering to and accumulating on the catalyst, and the working time can be greatly shortened. all right. Further, it has been found that the denitration performance is improved because the dust adhering to the plate catalyst can be removed with high efficiency. Further, it has been found that the catalyst performance can be improved by adopting the structure of the catalyst structure of the present invention and providing a hole for gas flow through the plate catalyst.

7 Band-shaped projection 10 Catalyst structure 11 Catalyst layer 13, 29 Plate-shaped catalyst 15 Support rod 17 Through hole 19 Frame body 21 Mounting hole 23 Other support rod 25 Dust 27 Hinge 31 Gas flow hole 35 Catalyst paste 37 Roller 39 Mold

Claims (4)

In a catalyst structure in which a plurality of plate-shaped catalysts are arranged by forming gas flow paths between adjacent plate-shaped catalysts and accommodated in a cylindrical frame body,
The plurality of plate catalysts are supported in the frame body by inserting support rods into the plurality of through holes formed in each plate catalyst and fixing both ends of the support rods to the frame body. The catalyst structure characterized by being made.   2. The catalyst structure according to claim 1, wherein each plate-like catalyst is formed with a gas flow hole communicating with the adjacent gas flow path in addition to the through hole through which the support rod is inserted.   The frame body is formed in a rectangular tube shape having four rectangular side plates, and the side plates are rotatably connected to each other by a hinge on any one of the four sides in the axial direction. The catalyst structure according to claim 1 or 2. A method for cleaning a catalyst structure according to any one of claims 1 to 3,
The surface of the frame body to which one end of the support rod is fixed is removed from one end of the support rod, and one end of another support rod is connected to the end surface of the support rod from which the surface of the frame body is removed, and the support A method for cleaning a catalyst structure, comprising: cleaning the plate catalyst after moving the plurality of plate catalysts supported by the rod along the other support rod.

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