Ultralow-temperature SCR (Selective Catalytic Reduction) flue gas denitration device

Abstract

The invention relates to the technical field of flue gas denitration, in particular to an ultralow-temperature SCR flue gas denitration device which mainly comprises a catalytic converter, a blocking mechanism and a flow guide mechanism, a gas inlet and a gas outlet are formed in the two ends of the catalytic converter, the blocking mechanism is arranged in the catalytic converter, and the flow guide mechanism is arranged in the catalytic converter. The air cylinder is started to drive the fixing block and the blocking frame to move, the blocking frame drives the telescopic corrugated plate to extend, the sealing gasket is sealed with the side faces of the blocking frame and the telescopic corrugated plate, the blocking frame and the telescopic corrugated plate conduct blocking sealing on the grid and the catalyst, and it is guaranteed that smoke is not prone to leakage; the flue gas in the catalytic converter flows to the rear catalyst through the flow guide pipe to be treated, at the moment, the catalyst reaching the service life is discharged from the discharging frame, a new catalyst is added from the feeding pipe, the catalyst can be replaced without stopping the whole denitration device, the collaboration and continuity of the whole production system are guaranteed, and the production efficiency is improved. The flue gas treatment efficiency is also greatly improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas denitrification technology, specifically to an ultra-low temperature SCR flue gas denitrification device. Background Technology

[0002] SCR (Selective Catalytic Reduction) denitrification units utilize ammonia to reduce NOx in flue gas under the action of a catalyst, yielding nitrogen and water. Traditional SCR denitrification units typically employ fixed-bed reactors with horizontal or vertical flue gas flow. The catalyst is similar to structured packing material, including various types such as honeycomb and plate, arranged in modules. These modules are arranged inside the reactor via support beams, and the flue gas reacts on the catalyst surface after passing through it.

[0003] Traditional SCR catalysts require relatively high temperatures to react, and SCR denitrification units are generally designed for high temperatures. Flue gas flows horizontally through the catalyst, which reduces NOx in the flue gas to ammonia and water. However, when the catalyst reaches the end of its lifespan, the flue gas being processed must be stopped before it can be replaced, causing the entire denitrification unit to stop operating. The originally continuous and stable flue gas treatment process is forced to be interrupted, which may cause subsequent production processes to be unable to proceed at the normal pace, thus affecting the coordination and continuity of the entire production system. At the same time, it also greatly reduces the efficiency of flue gas treatment. Summary of the Invention

[0004] The purpose of this invention is to provide an ultra-low temperature SCR flue gas denitrification device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A cryogenic SCR flue gas denitrification device includes: a catalyst, with an inlet and an outlet at both ends; two sets of filters installed on the inner wall of the catalyst; two sets of grids installed on the inner wall of the catalyst; and a catalyst disposed inside each grid. The device also includes: The barrier mechanism is located inside the catalyst. The barrier mechanism includes a telescopic corrugated plate fixedly installed on the inner wall of the lower end of the catalyst, a barrier frame fixedly installed on the upper end of the telescopic corrugated plate, a scraper frame fixedly installed on the side of the barrier frame, and a guide pipe fixedly installed through the top of the grid. The flow guiding mechanism is located inside the catalyst. The flow guiding mechanism includes a cover plate that is rotatably mounted on the side of the flow guiding tube via a hinge. The flow guiding tube is equipped with a movable frame and a movable strip.

[0006] Preferably, each set of grids has two grids, with the catalyst located between the two grids. A feed pipe is fixedly installed through the top surface of the catalyst, and a discharge frame is fixedly installed through the bottom surface of the catalyst.

[0007] Preferably, a limiting frame is fixedly installed on the inner wall of both sides of the catalyst, and a sealing gasket is fixedly installed on the inner wall of the limiting frame. The two sides of the telescopic corrugated plate and the side of the barrier frame are slidably connected to the side of the sealing gasket.

[0008] Preferably, a fixing block is fixedly installed on the side of the barrier frame, and a cylinder is fixedly installed on the bottom surface of the catalyst. The upper end of the cylinder slides through the bottom surface of the catalyst and is fixedly connected to the bottom surface of the fixing block.

[0009] Preferably, the inner wall of the upper end of the barrier frame abuts against the outer wall of the guide tube and the inner wall of the upper end of the catalyst, the side of the scraper frame is slidably connected to the side of the grid, the guide tube is set in a semi-circular shape, and the top surface of the guide tube is fixedly connected to the inner wall of the upper end of the catalyst.

[0010] Preferably, two connecting blocks are fixedly installed on the outer wall of the guide pipe, and an arc-shaped rod is fixedly installed on the side of the connecting block. The other end of the arc-shaped rod is fixedly connected to the inner wall of the upper end of the catalyst. Two fixing sleeves are fixedly installed on the outer wall of the cover plate, and the inner wall of the fixing sleeve is slidably connected to the outer wall of the arc-shaped rod.

[0011] Preferably, an elastic element is slidably installed on the outer wall of the arc-shaped rod. The two ends of the elastic element are fixedly connected to the top surface of the fixed sleeve and the inner wall of the upper end of the catalyst, respectively. A T-shaped groove is opened on the inner wall of the upper end of the guide tube, and a T-shaped block is slidably installed on the inner wall of the T-shaped groove.

[0012] Preferably, the bottom surface of the T-shaped block is fixedly connected to the top surface of the movable frame, and a support wheel is rotatably mounted on one end of the movable frame via a rotating shaft, with the outer wall of the support wheel rollingly connected to the side of the cover plate.

[0013] Preferably, the movable frame has a groove inside, and an adjusting column is fixedly installed on the inner wall of the groove. The lower end of the movable bar slides through the inner wall of the lower end of the guide pipe and extends to the bottom of the guide pipe. The lower end of the movable bar abuts against the inner wall of the upper end of the barrier frame. An inclined groove is opened on the side of the movable bar, and the inner wall of the inclined groove is slidably connected to the outer wall of the adjusting column.

[0014] Preferably, limit sleeves are fixedly installed on both sides of the moving strip, and limit rods are slidably installed on the inner wall of the limit sleeves. The lower end of the limit rod is fixedly connected to the inner wall of the lower end of the guide tube. A circular plate is fixedly installed on the upper end of the limit rod, and an elastic element II is slidably installed on the outer wall of the limit rod. The two ends of the elastic element II are fixedly connected to the bottom surface of the circular plate and the top surface of the limit sleeve, respectively.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a cylinder to move a fixed block and a barrier frame. The barrier frame causes a telescopic corrugated plate to extend, and a sealing gasket seals the sides of the barrier frame and the telescopic corrugated plate. The barrier frame and the telescopic corrugated plate seal the grid and catalyst, ensuring that flue gas is not easily leaked. Simultaneously, the barrier frame pushes a moving bar upward, and the inclined groove on the moving bar moves an adjusting column and a moving frame. The moving frame drives a support wheel to support and open the cover plate. The flue gas in the catalyst flows through a guide pipe to the catalyst behind for treatment. At this time, the catalyst that has reached the end of its life is released from the discharge frame, and a new catalyst is added from the feed pipe. The catalyst can be replaced without stopping the entire denitrification device, thus ensuring the synergy and continuity of the entire production system and greatly improving the efficiency of flue gas treatment. When the cylinder drives the fixed block and the barrier frame to move upward, the barrier frame drives the scraper frame to move upward. The scraper frame removes dust particles from the surface of one side of the grid, preventing the grid from becoming blocked. This ensures that the flue gas can pass smoothly and quickly through the catalyst to treat the flue gas, thereby improving the treatment quality and efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the three-dimensional structure of the catalyst side of the present invention; Figure 3 This is a schematic cross-sectional view of one end of the catalyst of the present invention; Figure 4 This is an exploded view of the three-dimensional structure of the barrier frame of the present invention; Figure 5 This is an exploded view of the three-dimensional structure of the grid in this invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the movable strip of the present invention; Figure 7 This is a schematic cross-sectional view of the three-dimensional structure of the guide tube of the present invention; Figure 8 This is an exploded three-dimensional view of the movable frame of the present invention.

[0017] In the picture: 1. Catalyst; 101. Inlet; 102. Outlet; 103. Filter; 104. Grid; 105. Catalyst; 2. Barrier mechanism; 201. Feed pipe; 202. Discharge frame; 203. Limit frame; 204. Sealing gasket; 205. Barrier frame; 206. Telescopic corrugated plate; 207. Fixing block; 208. Cylinder; 209. Scraper frame; 210. Guide pipe; 3. Flow guiding mechanism; 301. Cover plate; 302. Fixing sleeve; 303. Connecting block; 304. Arc rod; 305. Elastic component one; 306. T-slot; 307. T-block; 308. Moving frame; 309. Support wheel; 310. Rotating shaft; 311. Tank body; 312. Adjusting column; 313. Moving bar; 314. Inclined groove; 315. Limiting sleeve; 316. Limiting rod; 317. Circular plate; 318. Elastic component two. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] like Figures 1-8 As shown, this application provides an ultra-low temperature SCR flue gas denitrification device, including: a catalyst 1, with an inlet 101 and an outlet 102 at both ends of the catalyst 1, two sets of filters 103 installed on the inner wall of the catalyst 1, two sets of grids 104 installed on the inner wall of the catalyst 1, and a catalyst 105 disposed inside each set of grids 104, and further including: The barrier mechanism 2 is located inside the catalyst 1. The barrier mechanism 2 includes a telescopic corrugated plate 206 fixedly installed on the inner wall of the lower end of the catalyst 1, a barrier frame 205 fixedly installed on the upper end of the telescopic corrugated plate 206, a scraper frame 209 fixedly installed on the side of the barrier frame 205, and a guide pipe 210 fixedly installed through the top of the grid 104. Specifically, such as Figures 1-8 As shown, each set of grids 104 has two grids, and the catalyst 105 is located between the two grids 104. The top surface of the catalyst 1 is fixedly connected to the feed pipe 201, and the bottom surface of the catalyst 1 is fixedly connected to the discharge frame 202.

[0021] In this embodiment: two sets of grids 104 are provided, and each set of grids 104 has two catalysts 105 located between the two grids 104, thereby forming a catalyst layer and a spare catalyst layer. The feed pipe 201 and the discharge frame 202 can easily replace the catalyst 105. The filter 103 is provided to filter dust particles in the flue gas.

[0022] Specifically, such as Figures 1-8 As shown, limit frames 203 are fixedly installed on the inner walls of both sides of the catalyst 1, and sealing gaskets 204 are fixedly installed on the inner walls of the limit frames 203. The two sides of the telescopic corrugated plate 206 and the side of the barrier frame 205 are slidably connected to the side of the sealing gasket 204.

[0023] In this embodiment: the sealing gasket 204 is fixed by the limiting frame 203. The two sides of the telescopic corrugated plate 206 and the two sides of the barrier frame 205 are circular, which makes it difficult to damage the sealing gasket 204. The two sides of the telescopic corrugated plate 206 and the two sides of the barrier frame 205 are sealed with the sealing gasket 204, so there will be no leakage of flue gas when the catalyst 105 is replaced. The telescopic corrugated plate 206 can extend and retract.

[0024] Specifically, such as Figures 1-8 As shown, a fixing block 207 is fixedly installed on the side of the barrier frame 205, and a cylinder 208 is fixedly installed on the bottom surface of the catalyst 1. The upper end of the cylinder 208 slides through the bottom surface of the catalyst 1 and is fixedly connected to the bottom surface of the fixing block 207.

[0025] In this embodiment: the cylinder 208 can drive the fixed block 207 and the barrier frame 205 to be adjusted, and can drive the barrier frame 205 to move up and down.

[0026] Specifically, such as Figures 1-8 As shown, the upper inner wall of the barrier frame 205 abuts against the outer wall of the guide pipe 210 and the upper inner wall of the catalyst 1. The side of the scraper frame 209 is slidably connected to the side of the grid 104. The guide pipe 210 is set in a semi-circular shape, and the top surface of the guide pipe 210 is fixedly connected to the upper inner wall of the catalyst 1.

[0027] In this embodiment: the scraper frame 209 is used to scrape off dust particles on one side of the grid 104 to ensure that the grid 104 is not easily blocked. The guide pipe 210 is provided so that when the catalyst 105 is replaced, the flue gas flows through the guide pipe 210, ensuring that the catalyst 105 can be replaced without stopping the machine.

[0028] The flow guiding mechanism 3 is located inside the catalyst 1. The flow guiding mechanism 3 includes a cover plate 301 that is rotatably mounted on the side of the flow guiding pipe 210 via a hinge. The flow guiding pipe 210 is provided with a movable frame 308 and a movable strip 313.

[0029] Specifically, such as Figures 1-8 As shown, two connecting blocks 303 are fixedly installed on the outer wall of the guide pipe 210. An arc-shaped rod 304 is fixedly installed on the side of the connecting block 303. The other end of the arc-shaped rod 304 is fixedly connected to the inner wall of the upper end of the catalyst 1. Two fixing sleeves 302 are fixedly installed on the outer wall of the cover plate 301. The inner wall of the fixing sleeve 302 is slidably connected to the outer wall of the arc-shaped rod 304.

[0030] In this embodiment: the fixed sleeve 302 and the cover plate 301 are limited by the arc-shaped rod 304, so that the cover plate 301 rotates more stably and the cover plate 301 blocks and seals the guide pipe 210.

[0031] Specifically, such as Figure 1 - Figure 8 As shown, an elastic element 305 is slidably installed on the outer wall of the arc-shaped rod 304. The two ends of the elastic element 305 are fixedly connected to the top surface of the fixed sleeve 302 and the inner wall of the upper end of the catalyst 1, respectively. A T-shaped groove 306 is opened on the inner wall of the upper end of the guide pipe 210. A T-shaped block 307 is slidably installed on the inner wall of the T-shaped groove 306.

[0032] In this embodiment: the elastic element 305 applies elastic force to the fixed sleeve 302, and further applies thrust to the cover plate 301, so that the cover plate 301 firmly seals the guide pipe 210. The T-shaped groove 306 limits the T-shaped block 307, so that the movement of the T-shaped block 307 is more stable.

[0033] Specifically, such as Figures 1-8 As shown, the bottom surface of the T-shaped block 307 is fixedly connected to the top surface of the movable frame 308. One end of the movable frame 308 is rotatably mounted with a support wheel 309 via a rotating shaft 310. The outer wall of the support wheel 309 is in rolling connection with the side of the cover plate 301.

[0034] In this embodiment: when the movable frame 308 moves, the movable frame 308 drives the support wheel 309 to move, and when the support wheel 309 moves, it pushes the cover plate 301 to open.

[0035] Specifically, such as Figures 1-8 As shown, the movable frame 308 has a groove 311 inside, and an adjusting column 312 is fixedly installed on the inner wall of the groove 311. The lower end of the movable bar 313 slides through the lower inner wall of the guide pipe 210 and extends to the bottom of the guide pipe 210. The lower end of the movable bar 313 abuts against the upper inner wall of the barrier frame 205. An inclined groove 314 is opened on the side of the movable bar 313, and the inner wall of the inclined groove 314 is slidably connected to the outer wall of the adjusting column 312.

[0036] In this embodiment: when the movable strip 313 is pressed upward by the barrier frame 205, the inclined groove 314 on the movable strip 313 drives the adjusting column 312 and the movable frame 308 to move, which in turn drives the support wheel 309 to push the cover plate 301 to open.

[0037] Specifically, such as Figures 1-8As shown, limit sleeves 315 are fixedly installed on both sides of the moving strip 313. Limit rods 316 are slidably installed on the inner wall of the limit sleeves 315. The lower end of the limit rods 316 is fixedly connected to the inner wall of the lower end of the guide tube 210. A circular plate 317 is fixedly installed on the upper end of the limit rods 316. An elastic element 318 is slidably installed on the outer wall of the limit rods 316. The two ends of the elastic element 318 are fixedly connected to the bottom surface of the circular plate 317 and the top surface of the limit sleeves 315, respectively.

[0038] In this embodiment: the elastic element 318 applies elastic force to the limiting sleeve 315, and further applies downward thrust to the moving strip 313.

[0039] Specifically, the following scheme is implemented: Flue gas and mixed gas enter the catalyst 1 through the inlet 101. Two sets of filters 103 remove sulfur dioxide, sulfur trioxide, and particulate matter from the flue gas. The flue gas passes through a set of grids 104 and a catalyst 105. No catalyst 105 is placed at the rear set of grids 104. Under the action of the catalyst 105, NOx in the flue gas is reduced to obtain nitrogen and water, which are discharged from the outlet 102. After the catalyst 105 reaches the end of its service life, a catalyst is added to the middle of the rear set of grids 104. Catalyst 105, opening cylinder 208, drives fixed block 207 and barrier frame 205 to move. Barrier frame 205 drives telescopic corrugated plate 206 to extend, sealing gasket 204 to seal the sides of barrier frame 205 and telescopic corrugated plate 206. Barrier frame 205 and telescopic corrugated plate 206 isolate and seal grid 104 and catalyst 105, ensuring that flue gas is not easily leaked. Furthermore, barrier frame 205 drives scraper frame 209 to move upward, scraper frame 209 removes dust particles from the surface of one side of grid 104, thus... The grid 104 will not be blocked. At the same time, the barrier frame 205 pushes the moving bar 313 upward. The inclined groove 314 on the moving bar 313 drives the adjusting column 312 and the moving frame 308 to move. The moving frame 308 drives the support wheel 309 to support and open the cover plate 301. The flue gas in the catalyst 1 flows through the guide pipe 210 to the catalyst 105 behind for treatment. At this time, the catalyst 105 that has reached the end of its service life is released from the discharge frame 202, and new catalyst 105 is added from the feed pipe 201. The catalyst 105 can be replaced without stopping the entire denitrification unit, thus ensuring the synergy and continuity of the entire production system. At the same time, it also greatly improves the efficiency of flue gas treatment. After the new catalyst 105 is added, the cylinder 208 drives the barrier frame 205 and the telescopic corrugated plate 206 to move downward to the initial position. At this time, under the action of the elastic element 305 and the elastic element 318, the cover plate 301 closes to seal the guide pipe 210, and the flue gas is treated through the grid 104 and the catalyst 105.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0041] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A cryogenic SCR flue gas denitrification device, comprising: A catalyst (1), wherein an air inlet (101) and an air outlet (102) are provided at both ends of the catalyst (1), two sets of filters (103) are installed on the inner wall of the catalyst (1), and two sets of grids (104) are installed on the inner wall of the catalyst (1), wherein a catalyst (105) is provided inside each set of grids (104), characterized in that it further includes: The barrier mechanism (2) is located inside the catalyst (1). The barrier mechanism (2) includes a telescopic corrugated plate (206) fixedly installed on the inner wall of the lower end of the catalyst (1). A barrier frame (205) is fixedly installed on the upper end of the telescopic corrugated plate (206). A scraper frame (209) is fixedly installed on the side of the barrier frame (205). A guide pipe (210) is fixedly installed through the top of the grid (104). The flow guiding mechanism (3) is located inside the catalyst (1). The flow guiding mechanism (3) includes a cover plate (301) that is rotatably mounted on the side of the flow guiding pipe (210) by a hinge. The flow guiding pipe (210) is provided with a movable frame (308) and a movable strip (313).

2. The cryogenic SCR flue gas denitrification device according to claim 1, characterized in that, Each set of grids (104) has two, the catalyst (105) is located between the two grids (104), the top surface of the catalyst (1) is fixedly connected with a feed pipe (201), and the bottom surface of the catalyst (1) is fixedly connected with a discharge frame (202).

3. The ultra-low temperature SCR flue gas denitrification device according to claim 2, characterized in that, The catalyst (1) has a limiting frame (203) fixedly installed on the inner walls of both sides, and a sealing gasket (204) is fixedly installed on the inner wall of the limiting frame (203). The two sides of the telescopic corrugated plate (206) and the side of the barrier frame (205) are slidably connected to the side of the sealing gasket (204).

4. The ultra-low temperature SCR flue gas denitrification device according to claim 3, characterized in that, A fixing block (207) is fixedly installed on the side of the barrier frame (205), and a cylinder (208) is fixedly installed on the bottom surface of the catalyst (1). The upper end of the cylinder (208) slides through the bottom surface of the catalyst (1) and is fixedly connected to the bottom surface of the fixing block (207).

5. The ultra-low temperature SCR flue gas denitrification device according to claim 4, characterized in that, The upper inner wall of the barrier frame (205) abuts against the outer wall of the guide pipe (210) and the upper inner wall of the catalyst (1). The side of the scraper frame (209) is slidably connected to the side of the grid (104). The guide pipe (210) is set in a semi-circular shape. The top surface of the guide pipe (210) is fixedly connected to the upper inner wall of the catalyst (1).

6. The cryogenic SCR flue gas denitrification device according to claim 1, characterized in that, Two connecting blocks (303) are fixedly installed on the outer wall of the guide pipe (210). An arc rod (304) is fixedly installed on the side of the connecting block (303). The other end of the arc rod (304) is fixedly connected to the inner wall of the upper end of the catalyst (1). Two fixing sleeves (302) are fixedly installed on the outer wall of the cover plate (301). The inner wall of the fixing sleeve (302) is slidably connected to the outer wall of the arc rod (304).

7. The cryogenic SCR flue gas denitrification device according to claim 6, characterized in that, An elastic element (305) is slidably installed on the outer wall of the arc-shaped rod (304). The two ends of the elastic element (305) are fixedly connected to the top surface of the fixed sleeve (302) and the inner wall of the upper end of the catalyst (1), respectively. A T-shaped groove (306) is opened on the inner wall of the upper end of the guide pipe (210). A T-shaped block (307) is slidably installed on the inner wall of the T-shaped groove (306).

8. The cryogenic SCR flue gas denitrification device according to claim 7, characterized in that, The bottom surface of the T-shaped block (307) is fixedly connected to the top surface of the movable frame (308). One end of the movable frame (308) is rotatably mounted with a support wheel (309) via a rotating shaft (310). The outer wall of the support wheel (309) is rolledly connected to the side of the cover plate (301).

9. The ultra-low temperature SCR flue gas denitrification device according to claim 8, characterized in that, The movable frame (308) has a groove (311) inside, and an adjusting column (312) is fixedly installed on the inner wall of the groove (311). The lower end of the movable strip (313) slides through the lower inner wall of the guide pipe (210) and extends to the bottom of the guide pipe (210). The lower end of the movable strip (313) abuts against the upper inner wall of the barrier frame (205). The side of the movable strip (313) is provided with an inclined groove (314), and the inner wall of the inclined groove (314) is slidably connected to the outer wall of the adjusting column (312).

10. The cryogenic SCR flue gas denitrification device according to claim 9, characterized in that, Limiting sleeves (315) are fixedly installed on both sides of the moving strip (313). A limiting rod (316) is slidably installed on the inner wall of the limiting sleeve (315). The lower end of the limiting rod (316) is fixedly connected to the inner wall of the lower end of the guide pipe (210). A circular plate (317) is fixedly installed on the upper end of the limiting rod (316). An elastic element two (318) is slidably installed on the outer wall of the limiting rod (316). The two ends of the elastic element two (318) are fixedly connected to the bottom surface of the circular plate (317) and the top surface of the limiting sleeve (315) respectively.

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