High-temperature waste gas catalytic device

By designing the adsorption plate assembly and the filter box assembly arranged in the exhaust gas treatment device, the problem of fine particle impurities affecting the adsorption effect in the prior art is solved, and efficient multi-stage adsorption and filtration of the exhaust gas is achieved, which significantly improves the treatment effect.

CN119746555AActive Publication Date: 2025-04-04NANJING YRD ECO DEV RI CO LTD
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Patent Information

Application Number
CN202411958422.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-04-04
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

When the existing activated carbon adsorption method treats organic waste gas, fine particle impurities adhere to the surface of the top activated carbon, resulting in poor adsorption effect. After long-term use, the upper activated carbon is saturated, and the lower activated carbon fails to efficiently adsorb the organic waste gas.

Method used

A high-temperature exhaust gas catalytic device is designed, including an adsorption plate assembly and a filter box assembly arranged in sequence from top to bottom. The adsorption plate assembly realizes layer by layer use of the adsorption plate by pushing the cylinder to ensure that the adsorption plate is always efficient; the filter box assembly is dispersed and filtered and adsorbed through the grid tank group and the filter rod group.

Benefits of technology

Through multi-stage adsorption and filtration, the effect of waste gas treatment is significantly improved, the service life of the adsorption plate is extended, the adsorption saturation problem is avoided, and the efficient pretreatment of organic waste gas is ensured.

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Abstract

The invention discloses a high-temperature waste gas catalytic device, and relates to the technical field of waste gas treatment. Comprising a box; the waste gas pipeline is arranged at the top in the box body; the number of the adsorption plate assemblies is two, the two adsorption plate assemblies are symmetrically arranged on the two sides of the waste gas pipeline correspondingly, and the side wall of the waste gas pipeline is provided with two gas grooves in one-to-one correspondence with the adsorption plate assemblies; the filter box assembly is arranged at the bottom in the box body; the plurality of air inlet pipes are arranged on the outer wall of the bottom of the box body; the adsorption plate assembly comprises a base obliquely arranged on the side wall of the waste gas pipeline, two plate grooves are formed in the base, a plurality of adsorption plates are sequentially and movably arranged in the plate grooves from top to bottom, a pushing air cylinder is embedded in the side wall of the waste gas pipeline, and a piston rod of the pushing air cylinder makes contact with the adsorption plate located on the lowermost layer. The side wall of the box body is provided with a plate outlet groove corresponding to the adsorption plate located on the lowermost layer in position. The waste gas treatment device has the advantages of improving the waste gas adsorption treatment effect and the like.
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Description

Technical Field

[0001] The invention relates to the technical field of exhaust gas treatment, and in particular to a high-temperature exhaust gas catalytic device. Background Art

[0002] A large amount of waste gas will be generated in many production reaction processes, which will cause serious environmental pollution. This requires enterprises to treat the waste gas generated during the production process and convert it into substances with less environmental pollution. Among the methods of waste gas treatment is activated carbon adsorption. At present, when performing activated carbon adsorption, the organic waste gas is directly introduced into the activated carbon adsorption box. There are often many other fine particulate impurities in the organic waste gas. During the flow of gas, the fine particulate impurities will adhere to the surface of the top layer of activated carbon, causing the activated carbon adsorption effect to deteriorate. After long-term use, after the activated carbon with the upper adsorption effect is saturated, the activated carbon on the lower layer has not yet adsorbed the organic waste gas, and the organic waste gas cannot be pre-treated efficiently. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a high-temperature exhaust gas catalytic device, which has the advantages of improving the effect of exhaust gas adsorption treatment.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a high-temperature exhaust gas catalytic device, comprising:

[0005] Box;

[0006] An exhaust gas pipe, which is arranged at the top of the box;

[0007] Adsorption plate assembly, there are two adsorption plate assemblies, and the two adsorption plate assemblies are symmetrically arranged on both sides of the exhaust gas pipe, and two air grooves corresponding to the adsorption plate assemblies are arranged on the side wall of the exhaust gas pipe;

[0008] A filter box assembly, the filter box assembly is arranged at the bottom of the box body;

[0009] An air intake pipe, wherein a plurality of air intake pipes are provided, and the plurality of air intake pipes are arranged on the outer wall of the bottom of the box body;

[0010] The adsorption plate assembly includes a base obliquely arranged on the side wall of the exhaust gas pipe, and two plate grooves are arranged on the base, and the two plate grooves correspond to the two adsorption plate assemblies one by one. A plurality of adsorption plates are movably arranged in the plate grooves from top to bottom in sequence, and a pushing cylinder is embedded in the side wall of the exhaust gas pipe, and the piston rod of the pushing cylinder contacts the adsorption plate located at the bottom layer, and a plate outlet groove corresponding to the position of the adsorption plate located at the bottom layer is arranged on the side wall of the box body;

[0011] The filter box assembly includes a rotating motor embedded in the inner wall of the box body, an outer filter box is arranged on the output shaft of the rotating motor, a grid slot group is arranged inside the outer filter box, and a filter rod group with a matching shape is movably inserted in the grid slot group.

[0012] Preferably, the exhaust gas pipe is vertically arranged at the top of the box body, and the upper end of the exhaust gas pipe passes through the top of the box body, so that the treated high-temperature exhaust gas can be discharged through the exhaust gas pipe.

[0013] Preferably, the adsorption plate comprises:

[0014] An activated carbon adsorption bottom plate, the activated carbon adsorption bottom plate is movably arranged in the plate groove;

[0015] An upper baffle, which is arranged on the top surface of the activated carbon adsorption bottom plate;

[0016] A clamping rod is arranged on the top surface of the upper baffle plate, and the piston rod of the push cylinder is pushed to contact the clamping rod located on the bottom adsorption plate;

[0017] The card rod groove is arranged on the bottom surface of the activated carbon adsorption bottom plate, and the size and shape of the card rod groove are adapted to the size and shape of the card rod, so that the activated carbon adsorption bottom plate can adsorb the exhaust gas.

[0018] Preferably, the sum of the heights of the activated carbon adsorption bottom plate, the upper baffle plate and the clamping rod matches the height of the plate outlet slot, so that the adsorption plate can be pushed out of the plate outlet slot to the outside of the box body by pushing the cylinder.

[0019] Preferably, the top and bottom surfaces of the filter outer box are both open, and the grid slot group includes a plurality of rectangular slots distributed in a matrix shape. The two ends of the rectangular slots in the length direction are respectively flush with the top opening and the bottom opening of the filter outer box, so as to facilitate the dispersed filtration and adsorption of the exhaust gas through the grid slot group.

[0020] Preferably, the filter rod assembly comprises:

[0021] A rod seat plate, the rod seat plate is movably arranged on the top opening of the filter outer box;

[0022] There are multiple filter rods, which are distributed in a matrix on the rod base plate. The number of filter rods is the same as the number of rectangular slots, and the filter rods correspond to the rectangular slots one by one. The filter rods are movably inserted in the rectangular slots at corresponding positions, so that the exhaust gas can be dispersed, filtered and adsorbed by the filter rods in the grid slot group.

[0023] Preferably, the filter rod and the rod seat plate are both honeycomb structures, which is convenient for increasing the contact area with the exhaust gas, thereby improving the filtering and adsorption effect on the exhaust gas.

[0024] Preferably, movable doors are hinged on two opposite side walls of the box body, and elastic blocking plates corresponding to the position of the outer wall of the filter outer box are arranged on the side walls of the movable doors. When the movable doors are closed, the elastic blocking plates are in contact with the outer wall of the filter outer box, so as to facilitate the removal of the filter rod group from the grid slot group or the installation of the filter rod group in the grid slot group.

[0025] The beneficial effects of the present invention are as follows: 1. The present invention can perform multi-stage adsorption filtration on the exhaust gas in sequence by sequentially arranging the adsorption plate assembly and the filter box assembly from top to bottom, thereby improving the treatment effect of the exhaust gas;

[0026] 2. The adsorption plate assembly comprises a plurality of adsorption plates stacked in sequence from top to bottom. When the adsorption plate at the bottom layer has been used for a long time and has a large number of fine particle impurities adhered to it, the pushing cylinder 33 can be started to push out the adsorption plate at the bottom layer, so that other adsorption plates can be used in sequence to adsorb the fine particle impurities in the organic waste gas, thereby improving the effect of waste gas treatment.

[0027] 3. A movable door is hinged on the side wall of the box, which is convenient for taking out the filter rod group from the grid slot group for replacement, or installing the filter rod group in the grid slot group, which is beneficial to adsorb fine particulate impurities in the exhaust gas and avoid adsorption saturation of the filter rod group. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the internal structure of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0030] Figure 2 A schematic diagram of the exhaust gas pipeline structure of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0031] Figure 3 A schematic diagram of the plate and slot positions of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0032] Figure 4 A schematic diagram of the structure of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention, wherein multiple adsorption plates are stacked in sequence from top to bottom.

[0033] Figure 5 A schematic diagram of the structure of an adsorption plate of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0034] Figure 6 A schematic diagram of the structure of a filter box assembly of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0035] Figure 7 A schematic diagram of the structure of a filter outer box of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0036] Figure 8 A schematic diagram of the structure of a filter rod group of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0037] Fig. 9 A schematic diagram of a movable door structure of a high-temperature exhaust gas catalytic device provided in an embodiment of the present invention.

[0038] Explanation of the reference numerals: 1. Box body; 2. Exhaust gas duct; 21. Air trough; 3. Adsorption plate assembly; 31. Base; 311. Plate trough; 32. Adsorption plate; 321. Activated carbon adsorption bottom plate; 322. Upper baffle; 323. Rod slot; 324. Rod; 33. Push cylinder; 34. Plate outlet slot; 4. Filter box assembly; 41. Rotating motor; 42. Filter outer box; 43. Grid slot group; 431. Rectangular slot; 44. Filter rod group; 441. Rod seat plate; 442. Filter rod; 5. Inlet pipe; 6. Movable door; 61. Elastic blocking plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1

[0041] like Figures 1 to 8As shown, the present invention provides a high-temperature exhaust gas catalytic device, including a box body 1; an exhaust gas pipe 2 is arranged at the top of the box body 1; two adsorption plate assemblies 3 are provided, and the two adsorption plate assemblies 3 are symmetrically arranged on both sides of the exhaust gas pipe 2, and two air grooves 21 corresponding to the adsorption plate assemblies 3 are arranged on the side wall of the exhaust gas pipe 2; a filter box assembly 4 is arranged at the bottom of the box body 1; a plurality of intake pipes 5 are provided, and the plurality of intake pipes 5 are arranged on the outer wall of the bottom of the box body 1; the adsorption plate assembly 3 includes a base 31 obliquely arranged on the side wall of the exhaust gas pipe 2, and two plate grooves 311 are arranged on the base 31, and the two plate grooves 311 correspond to the two adsorption plate assemblies 3 one by one, respectively, and the plate grooves 3 11, a plurality of adsorption plates 32 are movably arranged in sequence from top to bottom, a pushing cylinder 33 is embedded in the side wall of the exhaust pipe 2, the piston rod of the pushing cylinder 33 is in contact with the adsorption plate 32 located at the bottom layer, and a plate outlet groove 34 corresponding to the position of the adsorption plate 32 located at the bottom layer is arranged on the side wall of the box body 1; the filter box assembly 4 includes a rotating motor 41 embedded in the inner wall of the box body 1, a filter outer box 42 is arranged on the output shaft of the rotating motor 41, a grid slot group 43 is arranged inside the filter outer box 42, and a filter rod group 44 of a matching shape is movably inserted in the grid slot group 43; the exhaust pipe 2 is vertically arranged at the top of the box body 1, and the upper end of the exhaust pipe 2 passes through the top of the box body 1.

[0042] The exhaust gas enters the bottom of the box body 1 through the air inlet pipe 5, and first passes through the filter box assembly 4 for filtering and adsorption (that is, the exhaust gas enters the filter rod assembly 44 in the grid slot assembly 43 to filter and adsorb the fine particulate impurities in the organic exhaust gas); the exhaust gas after filtering and adsorption by the filter box assembly 4 enters the two adsorption plate assemblies 3 on the side walls of the exhaust pipe 2 for filtering and adsorption again (that is, the exhaust gas passes through the plate slot 311 on the base 31 and enters the adsorption plate 32 located at the bottom layer for filtration); and then enters the exhaust pipe 2 through the gas slot 21 for discharge.

[0043] When the adsorption plate 32 at the bottom layer has been used for a long time and has a lot of fine particle impurities attached to it, the pushing cylinder 33 can be started to push out the adsorption plate 32 at the bottom layer, so that other adsorption plates 32 can be used in turn to adsorb the fine particle impurities in the organic waste gas.

[0044] The rotating motor 41 can drive the filter outer box 42 to rotate, so that the grid slot group 43 faces the side wall direction of the box body 1, which is convenient for taking out or installing the filter rod group 44 from the grid slot group 43.

[0045] Embodiment 2

[0046] Based on the first embodiment, Figure 1 , Figures 3 to 5As shown, the adsorption plate 32 includes an activated carbon adsorption bottom plate 321, which is movably arranged in the plate groove 311; the upper baffle plate 322 is arranged on the top surface of the activated carbon adsorption bottom plate 321; the clamping rod 324 is arranged on the top surface of the upper baffle plate 322, pushing the piston rod of the cylinder 33 to collide with the clamping rod 324 located on the bottom adsorption plate 32; the clamping rod groove 323 is arranged on the bottom surface of the activated carbon adsorption bottom plate 321, and the size and shape of the clamping rod groove 323 are adapted to the size and shape of the clamping rod 324, so that the activated carbon adsorption bottom plate 321 can adsorb the exhaust gas; the sum of the heights of the activated carbon adsorption bottom plate 321, the upper baffle plate 322 and the clamping rod 324 is adapted to the height of the plate outlet groove 34.

[0047] Before the high-temperature exhaust gas catalytic device is used, multiple adsorption plates 32 can be stacked in sequence from top to bottom (that is, the clamping rod groove 323 in the adsorption plate 32 located in the upper layer is clamped on the outside of the clamping rod 324 in the adsorption plate 32 located in the lower layer, which is conducive to the multiple adsorption plates 32 being firmly placed after being stacked); and the adsorption plate 32 located in the bottom layer is located in the plate groove 311 (the shape and size of the plate groove 311 are compatible with the shape and size of the activated carbon adsorption bottom plate 321, so that the activated carbon adsorption bottom plate 321 can be placed in the plate groove 311 without falling, and it is convenient for exhaust gas to pass through the activated carbon adsorption bottom plate 321).

[0048] When the adsorption plate 32 at the bottom layer has been used for a long time and has a lot of fine particle impurities adhered to it, the pushing cylinder 33 can be started to push the adsorption plate 32 at the bottom layer (the end away from the pushing cylinder 33) from the plate outlet slot 34 to the outside of the box body 1 (the clamping rod 324 in the adsorption plate 32 at the bottom layer can slide in the clamping rod slot 323 in the adsorption plate 32 at the second-to-last layer), and then the adsorption plate 32 is pulled out, and the adsorption plate 32 at the second-to-last layer can fall into the plate slot 311, so that other adsorption plates 32 can be used in turn to adsorb fine particle impurities in the organic waste gas until the stacked multiple adsorption plates 32 are used up.

[0049] The height of the plate slot 311 can be made to match the number of stacked adsorption plates 32, and the size of the plate slot 311 is matched with the size of the adsorption plates 32, so that when the cylinder 33 is pushed to push the adsorption plate 32 located at the bottom layer out of the plate outlet slot 34, it will not affect the positions of other adsorption plates 32, thereby facilitating other adsorption plates 32 to fall into the plate slot 311 in turn for continued use.

[0050] A support plate may be tiltedly disposed on the outer wall of the box body 1 below the plate slot 311 , so that when the adsorption plate 32 needs to be moved out of the box body 1 , the support plate can support the adsorption plate 32 .

[0051] The side wall of the activated carbon adsorption bottom plate 321 close to the exhaust pipe 2 is a mesh structure, and the other three side walls are solid plate structures, which is conducive to allowing the exhaust gas to enter the exhaust pipe 2 after being filtered through the activated carbon adsorption bottom plate 321, avoiding the emission of the exhaust gas during adsorption and filtration.

[0052] Embodiment 3

[0053] Based on the first embodiment, Figure 1 , Figures 6 to 9 As shown, the top and bottom surfaces of the filter outer box 42 are both open, and the grid slot group 43 includes a plurality of rectangular slots 431 distributed in a matrix shape, and the two ends of the rectangular slots 431 in the length direction are respectively flush with the top surface opening of the filter outer box 42 and the bottom surface opening of the filter outer box 42; the filter rod group 44 includes a rod seat plate 441, and the rod seat plate 441 is movably arranged on the top surface opening of the filter outer box 42; a plurality of filter rods 442 are provided, and the plurality of filter rods 442 are distributed in a matrix shape on the rod seat plate 441, and the number of filter rods 442 is the same as the number of rectangular slots 431, and the filter rods 442 correspond to the rectangular slots 431 one by one, and the filter rods 442 are respectively movably inserted into It is arranged in the rectangular groove 431 at the corresponding position; the filter rod 442 and the rod seat plate 441 are both honeycomb structures; when the exhaust gas enters the box body 1 through the intake pipe 5, and then enters through the bottom of the rectangular groove 431, it is filtered by the filter rod 442 in the rectangular groove 431 (the rectangular grooves 431 distributed in a matrix shape are conducive to uniform distribution of the exhaust gas, and increase the contact area with the exhaust gas, thereby improving the adsorption and filtration effect of the exhaust gas); a plurality of bolts can be threadedly connected on the rod seat plate 441, so that when the filter rod 442 is inserted into the corresponding rectangular groove 431, the rod seat plate 441 can be connected to the top opening of the filter outer box 42 by bolts.

[0054] The box body 1 is hinged with movable doors 6 on both opposite side walls, and the side walls of the movable door 6 are provided with elastic blocking plates 61 corresponding to the outer wall position of the filter outer box 42, and when the movable door 6 is closed, the elastic blocking plate 61 conflicts with the outer wall of the filter outer box 42; when it is necessary to remove the filter rod group 44 from the grid slot group 43, the movable door 6 is opened first, and at this time, the elastic blocking plate 61 is separated from the outer wall of the filter outer box 42, so that it is convenient to rotate the motor 41 to drive the filter outer box 42 to rotate 90 degrees, that is, to make the rod seat plate 441 parallel to the side wall of the box body 1, so as to facilitate the removal of the filter rod group 44 from the grid slot group 43; when the movable door 6 is closed, the elastic blocking plate 61 conflicts with the outer wall of the filter outer box 42, and when the exhaust gas enters the box body 1 through the intake pipe 5, the exhaust gas can be prevented from flowing between the inner wall of the box body 1 and the outer wall of the filter outer box 42.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-temperature exhaust gas catalytic device, characterized in that: include: Box body (1); An exhaust gas pipe (2), the exhaust gas pipe (2) being arranged at the top of the box body (1); Adsorption plate assemblies (3), two adsorption plate assemblies (3) are provided, and the two adsorption plate assemblies (3) are symmetrically arranged on both sides of the exhaust gas pipe (2), and two air grooves (21) corresponding to the adsorption plate assemblies (3) are arranged on the side wall of the exhaust gas pipe (2); A filter box assembly (4), the filter box assembly (4) is arranged at the bottom of the box body (1); An air intake pipe (5), wherein a plurality of air intake pipes (5) are provided, and the plurality of air intake pipes (5) are provided on the outer wall of the bottom of the box body (1); The adsorption plate assembly (3) comprises a base (31) obliquely arranged on the side wall of the exhaust gas pipe (2), two plate grooves (311) are arranged on the base (31), the two plate grooves (311) correspond to the two adsorption plate assemblies (3) one by one, and a plurality of adsorption plates (32) are movably arranged in sequence from top to bottom in the plate grooves (311), a pushing cylinder (33) is embedded in the side wall of the exhaust gas pipe (2), a piston rod of the pushing cylinder (33) contacts the adsorption plate (32) located at the bottom layer, and a plate outlet groove (34) corresponding to the position of the adsorption plate (32) located at the bottom layer is arranged on the side wall of the box body (1); The filter box assembly (4) comprises a rotating motor (41) embedded in the inner wall of the box body (1); a filter outer box (42) is arranged on the output shaft of the rotating motor (41); a grid slot group (43) is arranged inside the filter outer box (42); and a filter rod group (44) of a matching shape is movably inserted in the grid slot group (43).

2. A high-temperature exhaust gas catalytic device as claimed in claim 1, characterized in that: The exhaust gas pipe (2) is vertically arranged at the top of the box body (1), and the upper end of the exhaust gas pipe (2) passes through the top of the box body (1).

3. A high temperature exhaust gas catalytic device as claimed in claim 1, characterized in that: The adsorption plate (32) comprises: An activated carbon adsorption bottom plate (321), the activated carbon adsorption bottom plate (321) is movably arranged in the plate groove (311); An upper baffle (322), the upper baffle (322) being arranged on the top surface of the activated carbon adsorption bottom plate (321); A clamping rod (324), which is arranged on the top surface of the upper baffle plate (322) and pushes the piston rod of the cylinder (33) to contact the clamping rod (324) located on the bottommost adsorption plate (32); The card rod groove (323) is arranged on the bottom surface of the activated carbon adsorption bottom plate (321), and the size and shape of the card rod groove (323) are compatible with the size and shape of the card rod (324).

4. A high temperature exhaust gas catalytic device as claimed in claim 3, characterized in that: The sum of the heights of the activated carbon adsorption bottom plate (321), the upper baffle plate (322) and the clamping rod (324) matches the height of the plate outlet slot (34).

5. A high temperature exhaust gas catalytic device as claimed in claim 1, characterized in that: The top surface and the bottom surface of the filter outer box (42) are both open, and the grid slot group (43) comprises a plurality of rectangular slots (431) distributed in a matrix shape, and the two ends of the rectangular slots (431) in the length direction are respectively flush with the top surface opening of the filter outer box (42) and the bottom surface opening of the filter outer box (42).

6. A high-temperature exhaust gas catalytic device as claimed in claim 5, characterized in that: The filter rod assembly (44) comprises: A rod seat plate (441), the rod seat plate (441) is movably arranged on the top surface opening of the filter outer box (42); A filter rod (442) is provided in plurality, and the plurality of filter rods (442) are distributed in a matrix on the rod base plate (441). The number of the filter rods (442) is the same as the number of the rectangular grooves (431), and the filter rods (442) correspond to the rectangular grooves (431) one by one. The filter rods (442) are movably inserted into the rectangular grooves (431) at corresponding positions.

7. A high temperature exhaust gas catalytic device as claimed in claim 6, characterized in that: The filter rod (442) and the rod base plate (441) are both honeycomb structures.

8. A high temperature exhaust gas catalytic device as claimed in claim 1, characterized in that: The box body (1) has movable doors (6) hingedly connected to two opposite side walls, and the side walls of the movable door (6) are provided with elastic blocking plates (61) corresponding to the position of the outer wall of the filter outer box (42). When the movable door (6) is closed, the elastic blocking plates (61) are in contact with the outer wall of the filter outer box (42).

Citation Information

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