A wear resistant scr catalyst structure

Abstract

The application relates to a wear-resistant SCR catalyst structure and relates to the field of SCR catalysts. The structure comprises an assembled frame box and a gas guide, a plurality of assembled insertion slots are evenly and horizontally arranged on the assembled frame box, the gas guide is slidably inserted into the assembled insertion slots, the gas guide comprises a gas guide frame box, a storage part and a spoiler, the gas guide frame box is slidably inserted into the assembled insertion slot, a plurality of storage parts and spoilers are transversely arranged in the gas guide frame box, the storage parts and the spoilers are transversely and spacedly arranged, the storage part comprises a reinforced rib frame, a mesh bag frame and an SCR catalyst filling block, two reinforced rib frames are symmetrically arranged, and the two reinforced rib frames are made of ceramic. The SCR catalyst filling block is wrapped by the mesh bag frame, the flow of flue gas is reduced to wash the SCR catalyst filling block, the flow of flue gas is reduced to directly wash the SCR catalyst filling block, the wear resistance of the SCR catalyst filling block is improved, the service life of the catalyst can reach the expectation, economic waste is avoided, and cost saving is facilitated.

Description

Technical Field

[0001] This application relates to the technical field of SCR catalysts, and in particular to a wear-resistant SCR catalyst structure. Background Technology

[0002] Selective catalytic reduction (SCR) catalysts are one of the key technologies for reducing nitrogen oxides in diesel engine or stationary source emissions. SCR systems use ammonia as a reducing agent to convert NOx into harmless nitrogen and water under the action of a catalyst.

[0003] The existing publication number CN211412047U, entitled "A Catalyst Structure," describes a catalyst structure as a cylinder with a built-in cavity. The cavity extends through the cylinder along its axial direction, and is formed by multiple arcs enclosing the cylinder in its radial direction. This invention achieves increased pore volume, high porosity, and strong impurity-carrying capacity by optimizing the pore structure distribution. Furthermore, this invention features a large external specific surface area, low bulk density, and high crushing strength. This catalyst is suitable as a catalyst or protective catalyst for gasoline, kerosene, diesel, atmospheric pressure wax oil, vacuum pressure wax oil, and residual oil.

[0004] Regarding the aforementioned technologies, the inventors discovered that honeycomb catalysts are a common structural form of denitrification catalysts, generally composed of pores of uniform size. These pores form catalytic channels, and the walls of these channels, formed by the catalyst, catalyze the flue gas flowing within them. However, this flue gas contains a high proportion of hard particles, such as silica particles. When the flue gas enters or leaves the denitrification catalyst, localized vortex airflow forms at the catalyst tip. This vortex airflow wears down the catalyst, starting from the tip, causing the catalyst's lifespan to fall short of expectations, resulting in economic waste and hindering cost savings. Utility Model Content

[0005] To overcome the problem that existing flue gas forms localized vortex airflow at the catalyst tip when entering or leaving the denitrification catalyst, and that this vortex airflow wears down the catalyst from the tip onwards, resulting in the catalyst's service life not meeting expectations, causing economic waste and hindering cost savings, this application provides a wear-resistant SCR catalyst structure.

[0006] The wear-resistant SCR catalyst structure provided in this application adopts the following technical solution:

[0007] A wear-resistant SCR catalyst structure includes an assembly frame and gas guides. Multiple assembly slots are evenly and horizontally perforated on the assembly frame, and gas guides are slidably inserted into each of these slots. Each gas guide includes a gas guide frame, a storage component, and a flow-deflecting component. The gas guide frame is horizontally slidably inserted into the assembly slots, and multiple storage components and flow-deflecting components are horizontally arranged inside the gas guide frame, spaced horizontally apart. The storage component includes a reinforcing rib frame, a mesh bag frame, and an SCR catalyst packing block. Two reinforcing rib frames are symmetrically arranged and made of ceramic material. A mesh bag frame is positioned between the two reinforcing rib frames, with both ends of the mesh bag frame fixed to adjacent end faces of the two reinforcing rib frames. The outside of the mesh bag frame, located between the two reinforcing rib frames, is filled with SCR catalyst packing blocks.

[0008] By adopting the above technical solution, in order to reduce the increased wear of SCR catalyst caused by the formation of airflow eddies during use, the flue gas flows into multiple air guides from the air inlet end of the assembly frame box. As the flue gas flows through the air guide frame box, it passes through multiple storage components and baffles. The baffles slow down the airflow velocity. The flue gas then enters the two reinforced ribs of the storage components. When the flue gas flows between the two reinforced ribs, it contacts the SCR catalyst packing through the mesh bag frame. Thus, the SCR catalyst packing is wrapped by the mesh bag frame, reducing the scouring of the SCR catalyst packing by the flowing flue gas and the direct scouring of the SCR catalyst packing by the airflow. This improves the wear resistance of the SCR catalyst packing, ensuring that the catalyst's service life reaches the expected level, avoiding economic waste, and saving costs.

[0009] Optionally, the air inlet end of the air guide frame box is connected and fixed with an embedded frame plate, and the air inlet end of the embedded frame plate of the air guide frame box is horizontally connected and fixed with an air inlet frame, and the air inlet frame is flared.

[0010] By adopting the above technical solution, the air inlet end of the air guide box is connected and fixed with a trumpet-shaped air inlet frame, which increases the flow diameter at the air inlet end of the air guide box and reduces the scouring velocity of the airflow.

[0011] Optionally, the air inlet end face of the assembly frame box is provided with an embedding groove at the end of multiple assembly slots, and the embedding groove at the end of the assembly slot cooperates with the embedding frame plate on the air guide frame box.

[0012] By adopting the above technical solution, the embedded groove at the end of the assembly slot of the air inlet of the assembly frame box cooperates with the embedded frame plate on the air guide frame box, and the limiting ensures the assembly stability of the assembly frame box and the air guide frame box.

[0013] Optionally, a spoiler block is fixed on the inner wall of the air intake frame, and the spoiler block is made of ceramic material.

[0014] By adopting the above technical solution, a baffle block made of ceramic material is fixed on the inner wall of the air intake frame. The baffle block blocks and disperses the incoming air, optimizes the airflow distribution, and reduces local eddies.

[0015] Optionally, the inner wall of the assembly slot of the assembly box is provided with a horizontal groove.

[0016] By adopting the above technical solution, a horizontal sliding groove is opened on the inner wall of the assembly slot of the assembled frame box, which facilitates the later assembly of the air guide frame box in the assembled frame box.

[0017] Optionally, a sliding strip is horizontally fixed on the outer wall of the air guide box, and the sliding strip is slidably assembled with the sliding groove.

[0018] By adopting the above technical solution, the sliding strip and the sliding groove on the air guide frame box are slidably assembled, and the air guide frame box is then slidably assembled in the assembly frame box.

[0019] Optionally, the spoiler includes a support frame, and multiple support frames are provided. The multiple support frames are symmetrically arranged inside the air guide frame box, and the multiple support frames inside the air guide frame box are arranged laterally in an alternating manner.

[0020] By adopting the above technical solution, multiple support frames are arranged laterally and staggered inside the gas guide frame box to block and disperse the airflow, slow down the airflow scouring velocity, and reduce the wear on the SCR catalyst.

[0021] Optionally, multiple support frames are fixed on the inner wall of the air guide frame box, and each of the multiple support frames has a baffle plate fixed on its outer end face, and the multiple support frames are arranged horizontally in a staggered manner.

[0022] By adopting the above technical solution, baffle plates are fixed on the outer end faces of multiple support frames, and the multiple support frames are arranged laterally in a staggered manner to disperse and guide the flue gas flow and avoid generating eddies.

[0023] In summary, this application includes at least one of the following beneficial technical effects: During use, to reduce the increased wear on the SCR catalyst caused by eddy currents in the airflow, the flue gas flows from the inlet end of the assembly frame into multiple air guides. As the flue gas flows through the air guide frame, it passes through multiple storage components and baffles. The baffles slow down the airflow. The flue gas then enters the two reinforced ribs of the storage components. As the flue gas flows between the two reinforced ribs, it contacts the SCR catalyst packing through the mesh bag frame. Thus, the SCR catalyst packing is enclosed by the mesh bag frame, reducing the scouring of the SCR catalyst packing by the flowing flue gas and the direct scouring of the SCR catalyst packing by the airflow. This improves the wear resistance of the SCR catalyst packing, ensuring that the catalyst's service life reaches the expected level, avoiding economic waste, and saving costs. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the overall structure of an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the overall structure of the embodiment of this application in an exploded state;

[0026] Figure 3 This is a schematic diagram of the assembled frame box in the disassembled state according to an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the air guide component in the disassembled state according to an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the storage component in the disassembled state according to an embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the structure of the turbulence component in the disassembled state according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Assembly frame box; 11. Assembly slot; 12. Embedding groove; 13. Sliding groove; 2. Air guide component; 21. Air guide frame box; 211. Sliding strip; 22. Air inlet frame; 221. Baffle block; 23. Material storage component; 231. Reinforcing rib frame; 232. Mesh bag frame; 233. SCR catalyst packing block; 24. Baffle component; 241. Support frame; 242. Baffle perforated plate. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] This application discloses a wear-resistant SCR catalyst structure. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A wear-resistant SCR catalyst structure includes an assembly frame box 1 and gas guide components 2. Multiple assembly slots 11 are evenly and horizontally perforated on the assembly frame box 1, and gas guide components 2 are slidably inserted into each of the multiple assembly slots 11. Each gas guide component 2 includes a gas guide frame box 21, a storage component 23, and a flow-deflecting component 24. The gas guide frame box 21 is horizontally slidably inserted into the assembly slots 11, and multiple storage components 23 and flow-deflecting components 24 are laterally arranged inside the gas guide frame box 21. The components 24 are arranged laterally at intervals. The storage component 23 includes a reinforcing rib frame 231, a mesh bag frame 232, and an SCR catalyst packing block 233. There are two symmetrical reinforcing rib frames 231, and the two reinforcing rib frames 231 are made of ceramic material. The mesh bag frame 232 is arranged between the two reinforcing rib frames 231, and the two ends of the mesh bag frame 232 are respectively fixed to the adjacent end faces of the two reinforcing rib frames 231. The outside of the mesh bag frame 232 is filled with the SCR catalyst packing block 233 between the two reinforcing rib frames 231.

[0033] By adopting the above technical solution, in order to reduce the increase in SCR catalyst wear caused by the formation of airflow eddies during use, the flue gas flows from the air inlet of the assembly frame box 1 into multiple air guides 2. The flue gas enters the air guide frame box 21. When the flue gas flows in the air guide frame box 21, it passes through multiple storage components 23 and baffles 24. The baffles 24 slow down the airflow. The flue gas enters the two reinforcing ribs 231 of the storage component 23. When the flue gas flows between the two reinforcing ribs 231, it contacts the SCR catalyst packing block 233 through the mesh bag frame 232. Thus, the SCR catalyst packing block 233 is wrapped by the mesh bag frame 232, reducing the scouring of the SCR catalyst packing block 233 by the flowing flue gas and reducing the direct scouring of the SCR catalyst packing block 233 by the airflow. This improves the wear resistance of the SCR catalyst packing block 233, so that the service life of the catalyst can reach the expected level, avoiding economic waste and saving costs.

[0034] Reference Figure 3 and Figure 4 An embedded frame plate is fixedly connected to the air inlet end of the air guide frame box 21, and an air inlet frame 22 is horizontally fixedly connected to the air inlet end of the embedded frame plate of the air guide frame box 21, and the air inlet frame 22 is funnel-shaped. The funnel-shaped air inlet frame 22 increases the flow diameter of the air inlet end of the air guide frame box 21 and reduces the scouring velocity of the airflow. The air inlet end face of the assembly frame box 1 has embedded grooves 12 at the ends of multiple assembly slots 11, and the embedded grooves 12 at the ends of the assembly slots 11 cooperate with the embedded frame plate on the air guide frame box 21. The embedded grooves 12 at the ends of the assembly slots 11 at the air inlet end of the assembly frame box 1 cooperate with the embedded frame plate on the air guide frame box 21, limiting and ensuring the assembly stability of the assembly frame box 1 and the air guide frame box 21. A baffle block 221 is fixed on the inner wall of the air inlet frame 22, and the baffle block 221 is made of ceramic material. A ceramic-made baffle 221 is fixed on the inner wall of the air intake frame 22. The baffle 221 blocks and disperses the incoming air, optimizes the airflow distribution, and reduces local eddies.

[0035] Reference Figure 3 and Figure 4 The inner wall of the assembly slot 11 of the assembly frame box 1 is horizontally provided with a sliding groove 13. This sliding groove 13 facilitates the later assembly of the air guide frame box 21 within the assembly frame box 1. A sliding strip 211 is horizontally fixed to the outer wall of the air guide frame box 21, and the sliding strip 211 is slidably assembled with the sliding groove 13. The sliding strip 211 on the air guide frame box 21 is slidably assembled with the sliding groove 13, allowing for later slid assembly of the air guide frame box 21 within the assembly frame box 1.

[0036] Reference Figure 4 and Figure 6The baffle 24 includes multiple support frames 241, which are symmetrically arranged inside the air guide frame box 21 and laterally staggered. These staggered support frames 241 are used to block and disperse the airflow, reduce the scouring velocity, and minimize wear on the SCR catalyst. The multiple support frames 241 are fixed to the inner wall of the air guide frame box 21, and baffle plates 242 are fixed to the outer end faces of each support frame 241. The staggered arrangement of the multiple support frames 241 further disperses and guides the flue gas flow, preventing the formation of eddies.

[0037] The implementation principle of the wear-resistant SCR catalyst structure in this application embodiment is as follows: In order to reduce the wear of the SCR catalyst caused by the formation of eddies in the airflow during use, the flue gas flows from the air inlet of the assembly frame box 1 into multiple air guides 2. The flue gas enters the air guide frame box 21. When the flue gas flows in the air guide frame box 21, it passes through multiple storage components 23 and baffles 24. The baffles 24 slow down the airflow. The flue gas enters the two reinforcing ribs 231 of the storage component 23. When the flue gas flows between the two reinforcing ribs 231, it contacts the SCR catalyst packing block 233 through the mesh bag frame 232, thereby the SCR catalyst packing block 233 is wrapped by the mesh bag frame 232. The system is designed to reduce the scouring of the SCR catalyst packing block 233 by the flowing flue gas and reduce the direct scouring of the SCR catalyst packing block 233 by the airflow, thereby improving the wear resistance of the SCR catalyst packing block 233. The air inlet end of the air guide frame box 21 is connected and fixed with a trumpet-shaped air inlet frame 22, which increases the flow diameter at the air inlet end of the air guide frame box 21 and slows down the scouring flow velocity. Multiple support frames 241 are arranged laterally and staggered inside the air guide frame box 21 to block and disperse the airflow, slow down the scouring flow velocity, and reduce the wear on the SCR catalyst. The outer end face of each of the multiple support frames 241 is fixed with a baffle plate 242, and the multiple support frames 241 are arranged laterally and staggered to disperse the scouring flow of the flue gas and avoid the generation of eddies.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wear-resistant SCR catalyst structure, characterized in that, The assembly includes an assembly frame (1) and an air guide (2). Multiple assembly slots (11) are evenly and horizontally perforated on the assembly frame (1), and the air guide (2) is slidably inserted into each of the multiple assembly slots (11). The air guide (2) includes an air guide frame (21), a storage component (23), and a flow deflector (24). The air guide frame (21) is horizontally slidably inserted into the assembly slots (11), and multiple storage components (23) and flow deflectors (24) are horizontally arranged inside the air guide frame (21). The storage component (23) is arranged horizontally at intervals. It includes a reinforcing rib frame (231), a mesh bag frame (232), and an SCR catalyst packing block (233). There are two symmetrical reinforcing rib frames (231), and the two reinforcing rib frames (231) are made of ceramic material. The mesh bag frame (232) is arranged between the two reinforcing rib frames (231), and the two ends of the mesh bag frame (232) are respectively fixed to the adjacent end faces of the two reinforcing rib frames (231). The outside of the mesh bag frame (232) is located between the two reinforcing rib frames (231) and filled with the SCR catalyst packing block (233).

2. The wear-resistant SCR catalyst structure according to claim 1, characterized in that: The air inlet end of the air guide box (21) is connected to and fixed with an embedded frame plate, and the air inlet end of the embedded frame plate of the air guide box (21) is horizontally connected to and fixed with an air inlet frame (22), and the air inlet frame (22) is horn-shaped.

3. The wear-resistant SCR catalyst structure according to claim 2, characterized in that: The air inlet end face of the assembly frame box (1) is provided with an embedded groove (12) at the end of multiple assembly slots (11), and the embedded groove (12) at the end of the assembly slot (11) cooperates with the embedded frame plate on the air guide frame box (21).

4. The wear-resistant SCR catalyst structure according to claim 3, characterized in that: A baffle block (221) is fixed on the inner wall of the air intake frame (22), and the baffle block (221) is made of ceramic material.

5. The wear-resistant SCR catalyst structure according to claim 1, characterized in that: The inner wall of the assembly slot (11) of the assembly box (1) is provided with a horizontal groove (13).

6. The wear-resistant SCR catalyst structure according to claim 5, characterized in that: A slide bar (211) is horizontally fixed on the outer wall of the air guide box (21), and the slide bar (211) is slidably assembled with the slide groove (13).

7. The wear-resistant SCR catalyst structure according to claim 1, characterized in that: The turbulence-disrupting component (24) includes a support frame (241), and multiple support frames (241) are provided. The multiple support frames (241) are symmetrically arranged inside the air guide box (21), and the multiple support frames (241) inside the air guide box (21) are arranged horizontally in an alternating manner.

8. The wear-resistant SCR catalyst structure according to claim 7, characterized in that: The multiple support frames (241) are fixed on the inner wall of the air guide frame box (21), and each of the multiple support frames (241) has a baffle plate (242) fixed on its outer end face, and the multiple support frames (241) are arranged horizontally in a staggered manner.

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