A flue gas denitrification device for pulverized coal boiler using gas fuel

Abstract

This invention relates to the field of boiler flue gas treatment technology, specifically to a flue gas denitrification device for a pulverized coal boiler using gas-fired fuel. The device includes a flue gas collection box, with a sealing sleeve fixedly connected to one side. A catalytic mechanism is housed inside the sealing sleeve. This invention introduces a mixture of flue gas and ammonia from the flue gas collection box into the inlet pipe, catalytic tube, and outlet pipe via a flue gas inlet. Different inlet diameters result in varying catalytic amounts in each catalytic unit. The catalyst inside the catalytic tube accelerates the reduction reaction between nitrogen oxides and ammonia in the flue gas. The threaded structure of the catalytic tube extends the catalytic time. This design effectively avoids the problem of significantly reduced reaction efficiency due to catalyst poisoning, effectively detoxifying the catalyst. Simultaneously, it extends the reaction time, improves the catalyst's lifespan, and reduces denitrification costs in practical applications.

Description

Technical Field

[0001] This invention relates to the field of boiler flue gas treatment technology, and specifically to a flue gas denitrification device for pulverized coal boilers using gas-fired fuel. Background Technology

[0002] Boiler flue gas denitrification (denitrification) technology is mainly used to reduce the emission of nitrogen oxides generated during boiler combustion, prevent air pollution, and improve environmental quality. Nitrogen oxides mainly include nitric oxide and nitrogen dioxide, which are harmful gases produced during combustion and can lead to acid rain, photochemical smog, air pollution, and health problems.

[0003] A desulfurization and denitrification system and process for coking flue gas is disclosed in the literature (publication number: CN117046276B). This device can automatically replace the catalyst without stopping the flow of flue gas into the flue gas mixing chamber, ensuring the efficiency of flue gas denitrification and allowing for immediate catalyst replacement, thus guaranteeing the denitrification effect. However, in actual use, this device cannot effectively extend the lifespan of the catalyst used, leading to catalyst poisoning requiring immediate replacement and failing to reduce denitrification costs. Furthermore, it cannot promptly treat the dust collected in the filter bags. Since the filter bags require cleaning after prolonged dust removal of the flue gas, the flue gas flow must be stopped during cleaning, reducing the device's processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the above problems by providing a flue gas denitrification device for pulverized coal boilers using gas fuel.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A flue gas denitrification device for a pulverized coal boiler using gas-fired fuel includes a flue gas collection box. A sealing sleeve is fixedly connected to one side of the flue gas collection box. A catalytic mechanism is arranged inside the sealing sleeve. The catalytic mechanism includes a servo motor, flue gas inlets of different diameters, a receiving plate, a docking plate, a flue gas inlet pipe, a catalytic tube, a second fixing plate, a flue gas outlet, a rotating rod, and a flue gas outlet pipe. The servo motor is fixedly connected to the flue gas collection box. The output shaft of the servo motor is fixedly connected to the rotating rod. The rotating rod is rotatably connected to the flue gas collection box. The rotating rod is fixedly connected to the second fixing plate. The second fixing plate is fixedly connected to the flue gas outlet pipe. The flue gas outlet pipe is fixedly connected to the catalytic tube. The catalytic tube is fixedly connected to the flue gas inlet pipe. The flue gas inlet pipe is fixedly connected to the docking plate. The docking plate is fixedly connected to the rotating rod. The docking plate is fitted with the receiving plate. The receiving plate is fixedly connected to the flue gas inlets of different diameters.

[0007] A smoke mixing box is fixedly connected to one side of the sealing sleeve. A dust removal mechanism is provided on one side of the smoke mixing box. The dust removal mechanism includes a dust removal box, an oxygen supply pipe, an air valve, a one-way valve, a return pipe, a dust removal screen, a dust separation box, an air outlet, and a baffle. The dust removal screen is fixedly connected to the smoke inlet pipe, the dust removal box is fixedly connected to the smoke mixing box, the dust separation box is fixedly connected to the dust removal box, the baffle is fixedly connected to the dust separation box, the return pipe is fixedly connected to the dust removal box, the return pipe is fixedly connected to the one-way valve, the return pipe and the air outlet are located on the same horizontal plane, the oxygen supply pipe is fixedly connected to the smoke collection box, and the air valve is fixedly connected to the oxygen supply pipe.

[0008] A servo motor drives a rotating rod to rotate counterclockwise, causing the fixed plate, exhaust pipe, catalytic tube, exhaust pipe, and docking plate to rotate along with the rod. This causes the exhaust pipe to gradually move away from the exhaust inlet, bringing the exhaust pipe corresponding to the smallest diameter exhaust inlet to the same horizontal plane as the oxygen supply pipe. Oxygen is then introduced into the catalytic tube through the oxygen supply pipe and gas valve, causing the catalyst inside the catalytic tube to undergo a high-temperature oxidation reaction. This oxidizes the sulfides and other substances deposited on its surface, thus detoxifying the catalyst. The rotation of the rod brings the catalytic mechanism, which was previously at the same horizontal plane as the oxygen supply pipe, to the same horizontal plane as the largest diameter exhaust inlet, thereby completing the rotation of the catalytic tube.

[0009] Furthermore, burners are fixedly installed on both sides of the smoke mixing box, and an output head is fixedly installed on one side of the burner. The output head is in contact with the inner wall of the smoke mixing box. Two sets of fixing blocks are fixedly connected inside the smoke mixing box, and both sets of fixing blocks are located on the same horizontal plane.

[0010] Furthermore, an ammonia supply pipe is fixedly installed on one side of the smoke mixing box, and a fixing plate is fixedly connected to one end of the ammonia supply pipe. Multiple sets of nozzles are fixedly installed on the lower surface of the fixing plate, and a fixing block is fixedly connected inside the smoke mixing box.

[0011] Furthermore, a smoke inlet pipe is fixedly connected to the surface of the smoke mixing box, and a flange is fixedly installed at one end of the smoke inlet pipe.

[0012] Furthermore, the ash removal box is internally fixedly connected with two sets of fixing blocks 3, both sets of fixing blocks 3 are located on the same horizontal plane, and a ash collection box is attached to one side of each fixing block 3.

[0013] Furthermore, a connecting rod is fixedly connected to the upper surface of the ash collection box, and a limit block is fixedly connected to the upper end of the connecting rod.

[0014] Furthermore, the ash collection box has reserved slots on both sides, and a locking block is attached to the inner wall of the reserved slot. A slider is fixedly connected to one side of the locking block, and the slider is slidably connected to the fixing block.

[0015] Furthermore, a spring is fixedly connected to one side of the slider, and the spring is fixedly connected to the fixed block.

[0016] Furthermore, a smoke exhaust pipe is fixedly connected to the surface of the smoke collection box, and a flange is fixedly installed at one end of the smoke exhaust pipe.

[0017] Furthermore, a push block is fixedly installed on the lower surface of the slider, and the push block is in contact with the fixed block.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. This invention introduces a mixture of tobacco and ammonia gas from inside the mixing chamber into the inlet pipe, catalytic tube, and outlet pipe via the inlet. Different inlet diameters result in varying catalytic amounts in each catalytic unit. The catalyst inside the catalytic tube accelerates the reduction reaction between nitrogen oxides and ammonia in the flue gas. The threaded structure of the catalytic tube extends the catalytic time, ensuring a more complete reaction. However, continuous reaction leads to catalyst poisoning, reducing reaction efficiency. A servo motor is then activated, driving a rotating rod counter-clockwise. This causes the fixed plate, outlet pipe, catalytic tube, inlet pipe, and connecting plate to rotate, gradually moving the inlet pipe away from the inlet. This results in the smallest diameter inlet pipe being used for the final catalytic reaction. The flue gas inlet pipe and oxygen supply pipe are at the same horizontal plane as the flue gas outlet. Oxygen is introduced into the catalytic tube through the oxygen supply pipe and gas valve, causing the catalyst inside the catalytic tube to undergo a high-temperature oxidation reaction. This oxidizes the sulfides and other substances deposited on its surface, thus detoxifying the catalyst. By rotating the rotating rod, the catalytic mechanism, which was previously at the same horizontal plane as the oxygen supply pipe, is now at the same horizontal plane as the flue gas inlet with the largest diameter, thereby completing the rotation of the catalytic tube. This structure effectively avoids the problem of a significant decrease in reaction efficiency after catalyst poisoning, achieving the effect of catalyst detoxification. At the same time, it extends the reaction time, improves the service life of the catalyst, and can also reduce the corresponding denitrification costs in actual use.

[0020] 2. This invention filters dust from the flue gas using an ash removal screen installed inside the flue gas inlet pipe, causing the dust to settle on the surface of the screen. When the catalyst is detoxified, the introduction of oxygen through the oxygen supply pipe back-flushes the dust on the surface of the ash removal screen, causing the dust to detach from the screen and enter the ash removal chamber along with the gas from the catalytic tube reaction. A baffle directs the gas flow downwards and then upwards, and gravity causes the dust to fall onto the surfaces of the limiting block and the fixing block. The gas is then reintroduced into the mixing chamber through a one-way valve and a return pipe. This structure effectively avoids the need for manual cleaning of the dust on the surface of the ash removal screen after prolonged reaction, achieving simultaneous dust removal during catalyst detoxification. Furthermore, it prevents dust from affecting the denitrification reaction, improving the denitrification efficiency of the device and reducing the corresponding dust removal costs.

[0021] 3. This invention collects dust from the surfaces of the limiting block and the fixing block using a dust collection box. When cleaning the dust inside the dust collection box, two sets of push blocks are pushed, causing the slider and locking block to move horizontally with the push blocks. This causes the locking block to disengage from the inner wall of the reserved slot, compressing the spring. Under the action of gravity, the dust collection box, connecting rod, and limiting block move vertically downwards. At this time, the limiting block is in contact with the upper surface of the fixing block, so that the lower surface of the dust removal box is sealed after a brief opening. The staff can then collect and process the dust inside the dust collection box. After processing, the dust collection box is pushed upwards until it is at the same level as the fixing block. The push blocks are then released, and the spring force causes the locking block to re-engage with the inner wall of the reserved slot, thus limiting the dust collection box. This structure effectively avoids the problem of stopping exhaust during dust removal, achieving the effect of dust removal without affecting the denitrification of flue gas. At the same time, it improves the denitrification efficiency of the device, reduces the difficulty of processing for staff, and reduces the time required for dust removal. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is the present invention. Figure 1 A schematic diagram of the frontal cross-sectional structure;

[0024] Figure 3 This is the present invention. Figure 1 A schematic diagram of the left-side view structure;

[0025] Figure 4 This is the present invention. Figure 3 A frontal view of the internal structure;

[0026] Figure 5 This is the present invention. Figure 4 A schematic diagram of the left-side partial structure;

[0027] Figure 6 This is the present invention. Figure 3 A schematic diagram of the structure from below;

[0028] Figure 7 This is the present invention. Figure 6 A schematic diagram of the rear view section.

[0029] Attached reference numerals: 1. Mixing box; 11. Flange 1; 12. Inlet pipe; 13. Exhaust pipe; 14. Flange 2; 15. Smoke collection box; 16. Sealing sleeve; 2. Fixing plate 1; 21. Ammonia supply pipe; 22. Nozzle; 23. Burner; 24. Fixing block 1; 25. Fixing block 2; 26. Output head; 3. Catalytic mechanism; 31. Servo motor; 32. Inlets of different diameters; 33. Receiving plate; 34. Connecting plate; 35. Inlet pipe; 36. Catalytic tube 37. Fixed plate two; 38. Smoke exhaust hole; 39. Rotating rod; 310. Smoke outlet pipe; 4. Ash removal mechanism; 41. Ash removal box; 42. Oxygen supply pipe; 43. Air valve; 44. One-way valve; 45. Return pipe; 46. Ash removal screen; 47. Ash separation box; 48. Air outlet; 49. Baffle; 5. Fixed block three; 51. Push block; 52. Ash collection box; 53. Reserved slot; 54. Limiting block; 55. Connecting rod; 56. Locking block; 57. Sliding block; 58. Spring. Detailed Implementation

[0030] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] Example 1, as Figures 1-7 As shown, a flue gas denitrification device for a pulverized coal boiler using gas-fired fuel includes a smoke collection box 15. A sealing sleeve 16 is fixedly connected to one side of the smoke collection box 15. A catalytic mechanism 3 is installed inside the sealing sleeve 16. The catalytic mechanism 3 includes a servo motor 31, smoke inlets 32 of different diameters, a receiving plate 33, a connecting plate 34, a smoke inlet pipe 35, a catalytic tube 36, a fixing plate 37, a smoke exhaust hole 38, a rotating rod 39, and a smoke outlet pipe 310. The servo motor 31 is fixedly connected to the smoke collection box 15. The output shaft is fixedly connected to the rotating rod 39, the rotating rod 39 is rotatably connected to the smoke collection box 15, the rotating rod 39 is fixedly connected to the fixed plate 37, the fixed plate 37 is fixedly connected to the smoke outlet pipe 310, the smoke outlet pipe 310 is fixedly connected to the catalytic tube 36, the catalytic tube 36 is fixedly connected to the smoke inlet pipe 35, the smoke inlet pipe 35 is fixedly connected to the docking plate 34, the docking plate 34 is fixedly connected to the rotating rod 39, the docking plate 34 is attached to the receiving plate 33, and the receiving plate 33 is fixedly connected to the smoke inlet 32 ​​of different diameters.

[0032] A smoke mixing box 1 is fixedly connected to one side of the sealing sleeve 16. A dust removal mechanism 4 is provided on one side of the smoke mixing box 1. The dust removal mechanism 4 includes a dust removal box 41, an oxygen supply pipe 42, an air valve 43, a one-way valve 44, a return pipe 45, a dust removal screen 46, a dust separation box 47, an air outlet 48, and a baffle 49. The dust removal screen 46 is fixedly connected to the smoke inlet pipe 35. The dust removal box 41 is fixedly connected to the smoke mixing box 1. The dust separation box 47 is fixedly connected to the dust removal box 41. The baffle 49 is fixedly connected to the dust separation box 47. The return pipe 45 is fixedly connected to the dust removal box 41. The return pipe 45 is fixedly connected to the one-way valve 44. The return pipe 45 and the air outlet 48 are located on the same horizontal plane. The oxygen supply pipe 42 is fixedly connected to the smoke collection box 15. The air valve 43 is fixedly connected to the oxygen supply pipe 42.

[0033] The servo motor 31 drives the rotating rod 39 to rotate counterclockwise, causing the fixed plate 37, the smoke outlet pipe 310, the catalytic tube 36, the smoke inlet pipe 35, and the docking plate 34 to rotate along with the rotating rod 39. This causes the smoke inlet pipe 35 to gradually move away from the smoke inlet, so that the smoke inlet pipe 35 corresponding to the smallest diameter smoke inlet is on the same horizontal plane as the oxygen supply pipe 42. Oxygen is introduced into the catalytic tube 36 through the oxygen supply pipe 42 and the gas valve 43, causing the catalyst inside the catalytic tube 36 to undergo a high-temperature oxidation reaction, causing the sulfides deposited on its surface to oxidize, thereby detoxifying the catalyst. The rotation of the rotating rod 39 causes the catalytic mechanism 3, which was previously on the same horizontal plane as the oxygen supply pipe 42, to be on the same horizontal plane as the smoke inlet with the largest diameter, thus completing the rotation of the catalytic tube 36.

[0034] During flue gas denitrification treatment, the flue gas mixture inside the mixing chamber 1 is introduced into the inlet pipe 35, catalytic tube 36, and outlet pipe 310 through inlets 32 of different diameters. The different inlets 32 result in varying catalytic amounts in each catalytic unit 3. The catalyst inside the catalytic tube 36 accelerates the reduction reaction between nitrogen oxides and ammonia in the flue gas. The threaded structure of the catalytic tube 36 extends the catalytic time, allowing for a more complete reaction between the flue gas and ammonia. As the reaction continues, the catalyst generates… The poisoning phenomenon reduces reaction efficiency. The servo motor 31 is activated, driving the rotating rod 39 to rotate counter-clockwise. This causes the fixed plate 37, exhaust pipe 310, catalytic tube 36, exhaust pipe 35, and docking plate 34 to rotate along with the rotating rod 39. This causes the exhaust pipe 35 to gradually move away from the exhaust ports 32 of different diameters, until the exhaust pipe 35 corresponding to the smallest diameter exhaust port is at the same horizontal plane as the oxygen supply pipe 42. Oxygen is then introduced into the catalytic tube 36 through the oxygen supply pipe 42 and the gas valve 43. The catalyst inside the catalytic tube 36 undergoes a high-temperature oxidation reaction, causing the sulfides and other substances deposited on its surface to oxidize, thereby detoxifying the catalyst. The rotation of the rotating rod 39 brings the catalytic unit 3, previously at the same level as the oxygen supply pipe 42, to the same level as the flue gas inlet with the largest diameter, thus completing the rotation of the catalytic tube 36. During the denitrification process using the catalyst, dust in the flue gas is filtered through the ash removal screen 46 installed inside the flue gas inlet pipe 35, causing the dust to deposit on the surface of the ash removal screen 46. When the catalyst is detoxified, the oxygen introduced through the oxygen supply pipe 42 can backflush the dust on the surface of the dust removal screen 46, causing the dust to detach from the surface of the dust removal screen 46 and enter the interior of the dust removal box 41 along with the gas after the reaction in the catalyst tube 36. The baffle 49 makes the gas flow downward first and then upward. The dust falls onto the surface of the limiting block 54 and the fixing block 35 by gravity. The gas is then reintroduced into the interior of the flue gas mixing box 1 through the one-way valve 44 and the return pipe 45, and re-enters along with the undenitrified flue gas.

[0035] Example 2, as Figure 2 As shown, based on the above embodiment, it also includes burners 23 fixedly installed on both sides of the mixing chamber 1, and an output head 26 fixedly installed on one side of the burner 23. The output head 26 is attached to the inner wall of the mixing chamber 1. Two sets of fixing blocks 24 are fixedly connected inside the mixing chamber 1. The two sets of fixing blocks 24 are located on the same horizontal plane. The boiler flue gas is guided by the fixing blocks 24 so that the flue gas passes through the flame with the highest temperature at the output head 26, so that the flue gas reaches the optimal reaction temperature, thereby improving the denitrification effect of the device.

[0036] Example 3, as Figure 2As shown, based on the above embodiment, it also includes an ammonia supply pipe 21 fixedly installed on one side of the smoke mixing box 1, a fixing plate 2 fixedly connected to one end of the ammonia supply pipe 21, a plurality of nozzles 22 fixedly installed on the lower surface of the fixing plate 2, a fixing block 25 fixedly connected inside the smoke mixing box 1, the ammonia water sprayed by the nozzles 22 is vaporized through the output head 26, and the flue gas is guided by the fixing block 25 so that the flue gas, ammonia and water vapor are fully mixed, thereby improving the denitrification effect of the device.

[0037] Example 4, as Figure 1 As shown, based on the above embodiment, it also includes a smoke inlet pipe 12 fixedly connected to the surface of the smoke mixing box 1, and a flange 11 fixedly installed at one end of the smoke inlet pipe 12. The smoke inlet pipe 12 and the flange 11 make it easy for the device to be connected to the tail flue, reducing the installation difficulty and the corresponding installation time.

[0038] Example 5, as Figure 6 As shown, based on the above embodiment, it also includes two sets of fixing blocks 3 5 fixedly connected inside the dust removal box 41. Both sets of fixing blocks 3 5 are located on the same horizontal plane. A dust collection box 52 is attached to one side of the fixing blocks 3 5. Since the upper surface of the fixing blocks 3 5 is inclined, the dust gradually falls into the dust collection box 52 by gravity. At the same time, the fixing blocks 3 5 and the dust collection box 52 are tightly attached to prevent the leakage of harmful gases.

[0039] Example 6, as Figure 7 As shown, based on the above embodiment, it also includes a connecting rod 55 fixedly connected to the upper surface of the ash collection box 52, and a limiting block 54 fixedly connected to the upper end of the connecting rod 55. When cleaning the dust inside the ash collection box 52, the limiting block 54 fits against the upper surface of the fixing block 55, so that the lower surface of the ash removal box 41 is sealed after a brief opening, thereby preventing a large amount of harmful gas from leaking when cleaning the dust inside the ash collection box 52.

[0040] Example 7, as Figure 6 , Figure 7 As shown, based on the above embodiment, it also includes a reserved groove 53 on both sides of the ash collection box 52, a locking block 56 attached to the inner wall of the reserved groove 53, a slider 57 fixedly connected to one side of the locking block 56, and the slider 57 slidably connected to the fixing block 5. The locking block 56 limits the ash collection box 52, thereby improving the stability of the ash collection box 52 during use.

[0041] Example 8, as Figure 6 , Figure 7 As shown, based on the above embodiment, a spring 58 is fixedly connected to one side of the slider 57. The spring 58 is fixedly connected to the fixing block 3 5. The elastic force of the spring 58 prevents the slider 57 from shifting, thereby improving the safety of the denitrification device.

[0042] Example 9, as Figure 1 As shown, based on the above embodiment, it also includes a flue pipe 13 fixedly connected to the surface of the flue gas collection box 15, and a flange 2 14 fixedly installed at one end of the flue pipe 13. The connection between the flue pipe 13 and the flange 2 14 facilitates the connection of the device with the subsequent desulfurization device, thereby improving the convenience of disassembly and assembly of the device.

[0043] Example 10, as follows Figure 6 , Figure 7 As shown, based on the above embodiment, a push block 51 is fixedly installed on the lower surface of the slider 57. The push block 51 is in contact with the fixed block 5. The push block 51 facilitates the disassembly and assembly of the ash collection box 52 by the staff, thereby improving the efficiency of ash cleaning.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue gas denitrification device for a pulverized coal boiler using gas-fired fuel, comprising a flue gas collection box (15), characterized in that, A sealing sleeve (16) is fixedly connected to one side of the smoke collection box (15). A catalytic mechanism (3) is provided inside the sealing sleeve (16). The catalytic mechanism (3) includes a servo motor (31), smoke inlets (32) of different diameters, a receiving plate (33), a docking plate (34), a smoke inlet pipe (35), a catalytic tube (36), a second fixing plate (37), a smoke exhaust hole (38), a rotating rod (39), and a smoke outlet pipe (310). The servo motor (31) is fixedly connected to the smoke collection box (15), and the output shaft of the servo motor (31) is fixedly connected to the rotating rod (39). The rod (39) is rotatably connected to the smoke collection box (15), the rotating rod (39) is fixedly connected to the second fixed plate (37), the second fixed plate (37) is fixedly connected to the smoke outlet pipe (310), the smoke outlet pipe (310) is fixedly connected to the catalytic tube (36), the catalytic tube (36) is fixedly connected to the smoke inlet pipe (35), the smoke inlet pipe (35) is fixedly connected to the docking plate (34), the docking plate (34) is fixedly connected to the rotating rod (39), the docking plate (34) is attached to the receiving plate (33), and the receiving plate (33) is fixedly connected to the smoke inlets (32) of different diameters; A smoke mixing box (1) is fixedly connected to one side of the sealing sleeve (16). A dust removal mechanism (4) is provided on one side of the smoke mixing box (1). The dust removal mechanism (4) includes a dust removal box (41), an oxygen supply pipe (42), an air valve (43), a one-way valve (44), a return pipe (45), a dust removal screen (46), a dust separation box (47), an air outlet (48), and a baffle (49). The dust removal screen (46) is fixedly connected to the smoke inlet pipe (35). The dust removal box (41) is connected to the smoke mixing box. (1) Fixed connection: the ash box (47) is fixedly connected to the ash removal box (41), the baffle (49) is fixedly connected to the ash box (47), the return pipe (45) is fixedly connected to the ash removal box (41), the return pipe (45) is fixedly connected to the one-way valve (44), the return pipe (45) and the air outlet (48) are located on the same horizontal plane, the oxygen supply pipe (42) is fixedly connected to the smoke collection box (15), and the air valve (43) is fixedly connected to the oxygen supply pipe (42); The servo motor (31) drives the rotating rod (39) to rotate counterclockwise, so that the fixed plate (37), the smoke outlet pipe (310), the catalytic tube (36), the smoke inlet pipe (35) and the docking plate (34) follow the rotating rod (39) to rotate, so that the smoke inlet pipe (35) and the smoke inlet gradually move away, so that the smoke inlet pipe (35) corresponding to the smallest diameter smoke inlet is on the same horizontal plane as the oxygen supply pipe (42). Oxygen is introduced into the interior of the catalytic tube (36) through the oxygen supply pipe (42) and the gas valve (43), so that the catalyst inside the catalytic tube (36) undergoes a high-temperature oxidation reaction, so that the sulfides deposited on its surface are oxidized, thereby detoxifying the catalyst. The rotation of the rotating rod (39) makes the catalytic mechanism (3) that was previously on the same horizontal plane as the oxygen supply pipe (42) and the smoke inlet with the largest diameter on the same horizontal plane, thereby completing the rotation of the catalytic tube (36).

2. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that, Burners (23) are fixedly installed on both sides of the smoke mixing box (1). An output head (26) is fixedly installed on one side of the burner (23). The output head (26) is in contact with the inner wall of the smoke mixing box (1). Two sets of fixing blocks (24) are fixedly connected inside the smoke mixing box (1). Both sets of fixing blocks (24) are located on the same horizontal plane.

3. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that, Ammonia supply pipe (21) is fixedly installed on one side of the smoke mixing box (1), and a fixing plate (2) is fixedly connected to one end of the ammonia supply pipe (21). Multiple sets of nozzles (22) are fixedly installed on the lower surface of the fixing plate (2), and a fixing block (25) is fixedly connected inside the smoke mixing box (1).

4. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that, The surface of the smoke mixing box (1) is fixedly connected to a smoke inlet pipe (12), and a flange (11) is fixedly installed at one end of the smoke inlet pipe (12).

5. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that, The ash removal box (41) is internally fixedly connected to two sets of fixing blocks (5), both sets of fixing blocks (5) are located on the same horizontal plane, and a ash collection box (52) is attached to one side of the fixing blocks (5).

6. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 5, characterized in that, A connecting rod (55) is fixedly connected to the upper surface of the ash collection box (52), and a limit block (54) is fixedly connected to the upper end of the connecting rod (55).

7. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 5, characterized in that, Both sides of the ash collection box (52) are provided with reserved slots (53). The inner wall of the reserved slot (53) is fitted with a card block (56). A slider (57) is fixedly connected to one side of the card block (56). The slider (57) is slidably connected to the fixed block three (5).

8. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 7, characterized in that, A spring (58) is fixedly connected to one side of the slider (57), and the spring (58) is fixedly connected to the fixing block three (5).

9. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that, The surface of the smoke collection box (15) is fixedly connected to the smoke exhaust pipe (13), and a flange (14) is fixedly installed at one end of the smoke exhaust pipe (13).

10. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 7, characterized in that, A push block (51) is fixedly installed on the lower surface of the slider (57), and the push block (51) is in contact with the fixed block three (5).

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