High-temperature high-dust flue gas SCR denitration soot blowing system

Abstract

The application discloses a high-temperature and high-dust flue gas SCR denitration soot blowing system, which comprises a box body, a flue gas inlet is formed in the top of the box body, and a flue gas outlet is formed in the bottom of the box body; a plurality of catalyst modules are arranged in the box body in a spaced manner from top to bottom; a plurality of soot blowing assemblies for blowing the accumulated soot on the catalyst modules towards the side of the box body are arranged above each catalyst module; a flue gas descending assembly in communication with the box body is arranged outside the box body, and a flue gas ascending assembly in communication with the box body is arranged above the flue gas descending assembly; the high-temperature and high-dust flue gas is blown into the flue gas descending assembly by the soot blowing assemblies and enters a smoke dust separation device for smoke dust separation; the high-temperature and low-dust flue gas after smoke dust separation is extracted by a high-temperature fan and sent into the flue gas ascending assembly and then into the box body, which can not only prevent the abrasion and blockage of the catalyst caused by dust but also reduce the disturbance to the catalytic reaction temperature in the box body.

Description

Technical Field

[0001] This invention relates to a high-temperature, high-dust flue gas SCR denitrification and soot blowing system, belonging to the field of environmental protection technology. Background Technology

[0002] SCR (Selective Catalytic Reduction) involves installing a catalytic reactor at the outlet of the cement kiln preheater. A reducing agent (such as ammonia or urea) is injected before the reactor. Under appropriate temperature (300-400℃) and the action of a catalyst, nitrogen oxides in the flue gas are reduced to nitrogen and water. Currently, there are two options for SCR technology: one is to install the SCR equipment before the dust collector. In this case, the flue gas temperature is high enough to meet the requirements of the catalytic reduction reaction, but the high dust concentration can cause catalyst wear and blockage. The other option is to install the SCR equipment after the dust collector. In this case, the dust concentration is very low, eliminating the catalyst blockage problem, but the temperature drop is significant, resulting in insufficient catalytic reduction reaction temperature. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature, high-dust flue gas SCR denitrification soot blowing system. The system uses a flue gas downcomer to draw out the high-temperature, high-dust flue gas blown out by the soot blowing component for dust separation, and then introduces the high-temperature, low-dust flue gas into the chamber. This can prevent dust from causing wear and blockage to the catalyst and reduce the disturbance to the catalytic reaction temperature in the chamber.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A high-temperature, high-dust flue gas SCR denitrification soot blowing system includes a housing with a flue gas inlet at the top and a flue gas outlet at the bottom; multiple catalyst modules are arranged at intervals from top to bottom inside the housing; and multiple soot blowing components are arranged above each catalyst module to blow the accumulated ash on the catalyst module toward one side of the housing.

[0006] A flue gas descending component connected to the box body is installed outside the box body, and a flue gas rising component connected to the box body is installed above the flue gas descending component; the flue gas descending component is connected to the air inlet of the dust separation device, the air outlet of the dust separation device is connected to the air inlet of the high-temperature fan, and the air outlet of the high-temperature fan is connected to the air inlet of the flue gas rising component.

[0007] High-temperature, high-dust flue gas is blown into the flue gas descending component by the soot blowing component and then enters the dust separation device for dust separation. The high-temperature, low-dust flue gas after dust separation is extracted by the high-temperature fan and sent into the flue gas rising component and then into the housing.

[0008] Preferably, a rectifier grille is provided in the housing near the flue gas inlet, and the catalyst module is located in the housing below the rectifier grille.

[0009] Preferably, each soot blowing assembly includes an air supply pipe with multiple nozzles spaced apart on it, the nozzles having their actuators facing the catalyst module and the flue gas descending assembly. Both ends of the air supply pipe extend outside the housing and are connected to a compressed air manifold via a jetting control valve.

[0010] Preferably, the flue gas downcomer includes a dust collection hood and a high-temperature, high-dust flue gas outlet pipe disposed at the outlet end of the dust collection hood, and the high-temperature, high-dust flue gas outlet pipe is connected to the air inlet of the flue gas separation device.

[0011] Preferably, the flue gas rising assembly includes a distribution hood and a high-temperature, low-dust flue gas inlet pipe installed at the inlet end of the distribution hood, the high-temperature, low-dust flue gas inlet pipe being connected to the outlet of the high-temperature fan; a uniform air distribution assembly is also installed at the outlet of the distribution hood.

[0012] Preferably, the air distribution assembly includes a uniformly distributed air distribution plate slidably disposed in the air outlet of the air distribution hood, corresponding sliding grooves are provided on the two inner sides of the air outlet of the air distribution hood, sliding parts embedded in the sliding grooves are formed on both sides of the uniformly distributed air distribution plate, and a first spring is provided between the sliding part and the front wall of the corresponding sliding groove for pulling the uniformly distributed air distribution plate toward the air inlet side of the air distribution hood.

[0013] Preferably, a first proximity switch for detecting the contact of the uniformly distributed air distribution plate is provided on the rear end wall of each sliding groove;

[0014] A limiting groove is provided at one end of the uniformly distributed air distribution plate, a second proximity switch is provided in the limiting groove, and a triggering component is provided on the air distribution cover to trigger the second proximity switch after the first proximity switch is triggered.

[0015] A U-shaped brush with an opening facing downwards is embedded in the hood above the air outlet of the air distribution hood, and a lifting device is installed on the air distribution hood to drive the U-shaped brush to move up and down. After the trigger component triggers the second proximity switch, the lifting device moves to drive the U-shaped brush to remove dust from the evenly distributed air distribution plate.

[0016] Preferably, the uniformly distributed air distribution plate includes an outer frame and a filter plate that is slidably embedded in the outer frame along the length of the outer frame, with sliding portions formed on both sides of the outer frame;

[0017] The filter plate has multiple vent holes and both ends are slidably embedded into the outer frame. One end is provided with several second springs connecting the filter plate and the outer frame. The other end has an abutment part that passes through the corresponding side filter plate and the sliding part and extends into the corresponding side sliding groove. The side of the abutment part near the air inlet of the air distribution hood forms a slope.

[0018] An abutting block is embedded in the air distribution hood corresponding to the abutting part, and a telescopic device is provided on the air distribution hood for driving the abutting block to move linearly along the depth direction of the sliding groove.

[0019] An infrared proximity sensor is also installed inside the front wall of the sliding groove to detect the resetting of the uniformly distributed air distribution plate.

[0020] Preferably, a dust collection chamber corresponding to the U-shaped brush is provided below the air outlet of the air distribution hood. The dust collection chamber is connected to the outside of the air distribution hood, and an opening and closing port is provided at the connection port.

[0021] Preferably, the triggering component includes a magnetic limiting block embedded in the bottom wall of the sliding groove and an electromagnet disposed in the outer wall of the air distribution hood, with a third spring disposed between the electromagnet and the magnetic limiting block.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The high-temperature, high-dust flue gas blown out by the soot blowing component is led out by the flue gas downflow component for dust separation, and then the high-temperature, low-dust flue gas is introduced into the chamber. This can prevent dust from causing wear and blockage to the catalyst and reduce the disturbance to the catalytic reaction temperature in the chamber.

[0024] 2. The high-temperature, low-dust flue gas is evenly introduced into the chamber through the uniformly distributed air distribution plate, reducing the fluctuation of the flue gas temperature inside the chamber. At the same time, when too much dust adheres to the surface of the uniformly distributed air distribution plate, resulting in poor filtration effect and increased air resistance, the uniformly distributed air distribution plate will be pushed towards the air outlet of the air distribution hood under the action of the high-temperature, low-dust flue gas. After the uniformly distributed air distribution plate touches the first proximity switch, the component is triggered to act. Its actuator extends into the limit groove and triggers the second proximity switch. Then, the lifting device moves to drive the U-shaped brush to clean the uniformly distributed air distribution plate and remove the dust on its surface.

[0025] 3. After the dust on the surface of the evenly distributed air distribution plate is removed, the air resistance decreases. Under the action of the first spring, the evenly distributed air distribution plate will gradually return to its original position. After the infrared proximity sensor detects that the evenly distributed air distribution plate has returned to its original position, the telescopic device drives the abutment block to extend into the sliding groove. Therefore, during the resetting process of the evenly distributed air distribution plate, the slope of the abutment part will abut against the abutment block. Since the filter plate is slidably embedded in the outer frame, the abutment part will push the filter plate to squeeze the second spring under the action of the abutment block. That is, the abutment block will push the filter plate to move along the length direction of the outer frame. After the abutment part passes the abutment block, the second spring needs to return to its original position. Therefore, there will be a reciprocating extension and contraction to release the force. During this process, the filter plate will move back to its original position and vibrate, causing the dust remaining on the filter plate to be shaken off, thus improving the cleaning effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the denitrification soot blowing system;

[0027] Figure 2 This is a cross-sectional view of the denitrification and soot blowing system;

[0028] Figure 3 A schematic diagram of the connection at the flue gas separation device;

[0029] Figure 4 This is a schematic diagram of the structure of the air distribution hood;

[0030] Figure 5 This is a sectional view of the air distribution hood.

[0031] Figure 6 This is a schematic diagram of the end structure of the uniformly distributed air distribution plate;

[0032] Figure 7 This is a cross-sectional view of both ends of the evenly distributed air distribution plate.

[0033] The meanings of the main reference numerals in the figure are as follows:

[0034] 1. Housing; 2. Flue gas inlet; 3. Flue gas outlet; 4. Rectifying grille; 5. Catalyst module; 6. Gas delivery pipe; 7. Nozzle; 8. Purge control valve; 9. Compressed air manifold; 10. Dust separation device; 11. High-temperature fan; 12. Dust collection hood; 13. High-temperature, high-dust flue gas outlet pipe; 14. Air distribution hood; 15. High-temperature, low-dust flue gas inlet pipe; 16. Uniformly distributed air distribution plate; 17. Sliding groove; 18. Sliding section; 19. 20. First spring, 21. First proximity switch, 22. Limiting groove, 23. Second proximity switch, 24. Connecting groove, 25. Magnetic limiting block, 26. Electromagnet, 27. Third spring, 28. U-shaped brush, 29. Lifting device, 30. Dust collection chamber, 31. Opening and closing port, 32. Outer frame, 33. Filter plate, 34. Second spring, 35. Abutting part, 36. Abutting block, 37. Telescopic device, 38. Infrared proximity sensor. Detailed Implementation

[0035] This embodiment provides a high-temperature, high-dust flue gas SCR denitrification and soot blowing system. (See also...) Figure 1-2 As shown, the device includes a housing 1, with a flue gas inlet 2 at the top and a flue gas outlet 3 at the bottom. A rectifier grille 4 is installed inside the housing 1 near the flue gas inlet 2. Multiple catalyst modules 5 are arranged at intervals from top to bottom inside the housing 1 below the rectifier grille 4. Above each catalyst module 5, multiple sets of soot blowing assemblies are installed to blow the ash accumulated on the catalyst module 5 toward one side of the housing 1. Each soot blowing assembly includes an air supply pipe 6, with multiple nozzles 7 arranged at intervals on the air supply pipe 6, with their execution ends facing the catalyst module 5 and the flue gas descending assembly. Both ends of the air supply pipe 6 extend outside the housing 1 and are connected to a compressed air manifold 9 through a jet blowing control valve 8 (electrically connected to the controller).

[0036] A flue gas descending component connected to the housing 1 is installed outside the housing 1, and a flue gas rising component connected to the housing 1 is installed above the flue gas descending component. The flue gas descending component is connected to the air inlet of the dust separation device 10, the air outlet of the dust separation device 10 is connected to the air inlet of the high-temperature fan 11, and the air outlet of the high-temperature fan 11 is connected to the air inlet of the flue gas rising component. The high-temperature, high-dust flue gas is blown into the flue gas descending component by the soot blowing component and enters the dust separation device 10 for dust separation. The high-temperature, low-dust flue gas after dust separation is extracted by the high-temperature fan 11 and sent into the flue gas rising component and into the housing 1.

[0037] Specifically, the flue gas descending assembly includes a dust collection hood 12 and a high-temperature, high-dust flue gas outlet pipe 13 located at the outlet end of the dust collection hood 12, which is connected to the inlet of the dust separation device 10. The flue gas ascending assembly includes an air distribution hood 14 and a high-temperature, low-dust flue gas inlet pipe 15 located at the inlet end of the air distribution hood 14, which is connected to the outlet of the high-temperature fan 11; an air distribution assembly is also provided at the outlet of the air distribution hood 14.

[0038] High-temperature, high-dust flue gas enters the housing 1 through flue gas inlet 2, passes through the rectifier grille 4, and then vertically downwards through the catalyst module 5 to achieve catalytic denitrification. The denitrified flue gas is discharged through the flue gas outlet 3. In practical applications, gas flow is achieved by a fan in the denitrification system. When the high-temperature, high-dust flue gas passes through the catalyst module 5, the ash contained in the flue gas is trapped on the surface of the catalyst module 5. Typically, the amount of ash trapped on the surface of the upper catalyst module 5 is greater than that trapped on the surface of the lower catalyst module 5.

[0039] Dust trapped on the surface of catalyst module 5 can cause catalyst blockage, so it is blown away from the surface of catalyst module 5 by means of an air cannon. During use, the blow-off control valve 8 is opened intermittently by the controller, so that the compressed air in the compressed air tank 9 is sprayed out through the nozzle 7 and acts on the surface of catalyst module 5, so that the dust is blown to one side of the housing 1.

[0040] At this time, the high-temperature, high-dust flue gas generated by the jetting is guided by the high-temperature fan 11 through the dust collection hood 12 and the high-temperature, high-dust flue gas outlet pipe 13 into the dust separation device 10 for separation of flue gas and dust. The dust separation device 10 is a high-temperature dust collector that can withstand flue gas temperatures of 300-500℃ and has a dust removal efficiency of over 95%. The dust separation device 10 is installed in an open space, either on the ground or on a high-altitude steel structure. After dust separation, the high-temperature fan 11 guides the high-temperature, low-dust flue gas through the high-temperature, low-dust flue gas inlet pipe 15 into the air distribution hood 14. Then, after passing through the air distribution component, the flue gas is evenly distributed and returned to the housing 1 to reduce the disturbance to the temperature inside the housing 1.

[0041] The air distribution assembly includes a uniformly distributed air distribution plate 16 that is slidably disposed in the air outlet of the air distribution hood 14. Since some dust in the flue gas cannot be completely removed by the dust separation device 10, it enters the air distribution hood 14 and adheres to the uniformly distributed air distribution plate 16. The dust accumulated over a long period of time will affect the filtration effect of the uniformly distributed air distribution plate 16 and block the air vents on the uniformly distributed air distribution plate 16, thereby increasing the pressure inside the air distribution hood 14 (that is, the force acting on the uniformly distributed air distribution plate 16 will increase).

[0042] To improve the situation, the accumulated dust on the uniformly distributed air distribution plate 16 needs to be cleaned. See [link / reference] Figure 4-7 Corresponding sliding grooves 17 are opened on the two inner sides of the air outlet of the air distribution hood 14. Sliding parts 18 embedded in the sliding grooves 17 are formed on both sides of the evenly distributed air distribution plate 16. A first spring 19 is provided between the sliding part 18 and the front wall of the corresponding sliding groove 17 to pull the evenly distributed air distribution plate 16 toward the air inlet side of the air distribution hood 14.

[0043] A first proximity switch 20 for detecting the contact of the uniformly distributed air distribution plate 16 is provided on the rear end wall of each sliding groove 17. At the same time, a limiting groove 21 is formed at one end of the uniformly distributed air distribution plate 16, and a second proximity switch 22 is provided in the limiting groove 21. A triggering component for triggering the second proximity switch 22 after the first proximity switch 20 is triggered is provided on the air distribution cover 14. The triggering component includes a magnetic limiting block 24 embedded in the bottom wall (connecting groove 23) of the sliding groove 17 and an electromagnet 25 provided in the outer wall of the air distribution cover 14. A third spring 26 is provided between the electromagnet 25 and the magnetic limiting block 24.

[0044] A U-shaped brush 27 with an opening facing downwards is embedded in the hood above the air outlet of the air distribution hood 14 (a U-shaped plate with bristles on the inside, made of high-temperature resistant metal wire). A lifting device 28 for driving the U-shaped brush 27 to move up and down is installed on the air distribution hood 14. After the trigger component triggers the second proximity switch 22, the lifting device 28 moves to drive the U-shaped brush 27 to remove dust from the evenly distributed air distribution plate 16.

[0045] The first proximity switch 20, the second proximity switch 22, the electromagnet 25, and the lifting device 28 are all electrically connected to the controller. When the vents on the uniformly distributed air distribution plate 16 are blocked, the plate will move along the sliding groove 17 towards the air outlet of the air distribution hood 14 under the action of wind force. After the uniformly distributed air distribution plate 16 touches the first proximity switch 20 (meaning the plate has retracted to its original position), the first proximity switch 20 sends a feedback signal to the controller, which then de-energizes the electromagnet 25. Under the reaction force of the third spring 26, the magnetic limit block 24 moves towards the limit groove 21 and inserts into it, triggering the second proximity switch 22. The second proximity switch 22, once triggered, sends a feedback signal to the controller, which then controls the lifting device 28 to move, thereby driving the U-shaped brush 27 to move up and down back and forth, scraping the dust off the surface of the uniformly distributed air distribution plate 16.

[0046] To facilitate dust collection, a dust collection chamber 29 corresponding to the U-shaped brush 27 is provided below the air outlet of the air distribution hood 14. The dust collection chamber 29 is connected to the outside of the air distribution hood 14, and an opening / closing port 30 is provided at the connection point. Dust falls into the dust collection chamber 29, and the dust in the dust collection chamber 29 can be cleaned periodically through the opening / closing port 30. After a certain period of reciprocating scraping, the lifting device 28 is reset by the controller, and the lifting device 28 drives the U-shaped brush 27 to reset. Then, the electromagnet 25 is energized by the controller, and the electromagnet 25 generates magnetic force to drive the limit block to compress the second spring 33, which then moves out of the limit groove 21 and into the connecting groove 23.

[0047] To further improve the dust removal effect on the surface of the uniformly distributed air distribution plate 16, the uniformly distributed air distribution plate 16 is designed with the following structure: it includes an outer frame 31 and a filter plate 32 that is slidably embedded in the outer frame 31 along its length. Sliding portions 18 are formed on both sides of the outer frame 31. The filter plate 32 has multiple ventilation holes and its two ends are slidably embedded in the outer frame 31. Several second springs 33 are provided between one end and the outer frame 31 to connect the filter plate 32 and the outer frame 31. The other end has an abutment portion 34 that passes through the corresponding side filter plate 32 and the sliding portion 18 and extends into the corresponding side sliding groove 17. The abutment portion 34 has a slope on the side near the air inlet of the air distribution hood 14. That is, pushing the abutment portion 34 allows the filter plate 32 to slide along the length of the outer frame 31.

[0048] In order to trigger the sliding of the filter plate 32, an abutment block 35 is embedded in the air distribution hood 14 corresponding to the abutment part 34, and a telescopic device 36 is provided on the air distribution hood 14 to drive the abutment block 35 to move linearly along the depth direction of the sliding groove 17; at the same time, an infrared proximity sensor 37 is also provided in the front wall of the sliding groove 17 to detect the reset of the uniformly distributed air distribution hood 14.

[0049] After the surface dust of the uniformly distributed air distribution plate 16 is removed and cleaned, its filtration effect is restored, and the air resistance decreases. Therefore, the first spring 19 will pull the uniformly distributed air distribution plate 16 back to its original position. The infrared proximity sensor 37 is used to detect the resetting status of the uniformly distributed air distribution plate 16. When the uniformly distributed air distribution plate 16 shows a tendency to reset, the controller controls the telescopic device 36 to move, causing the abutment block 35 to extend into the sliding groove 17. When the abutment part 34 of the filter plate 32 contacts the abutment block 35, it pushes the abutment part 34 and causes the filter plate 32 to squeeze the second spring 33, thus achieving displacement. After the abutment part 34 passes the abutment block 35, the second spring 33 needs to reset, so there will be a reciprocating extension and contraction to release the force. During this process, the filter plate 32 will move back to its original position and vibrate, causing the residual dust on the filter plate 32 to be shaken off, improving the cleaning effect. Once the infrared proximity sensor 37 detects no longer any change in data, it indicates that the first spring 19 has completed its reset. Then, the controller controls the telescopic device 36 to reset, which in turn drives the abutment block 35 to reset.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature, high-dust flue gas SCR denitrification and soot blowing system, characterized in that, The box includes a flue gas inlet at the top and a flue gas outlet at the bottom. Multiple catalyst modules are arranged at intervals from top to bottom inside the box. Above each catalyst module, there are multiple sets of soot blowing components for blowing the ash accumulated on the catalyst module toward one side of the box. A flue gas descending component connected to the box body is installed outside the box body, and a flue gas rising component connected to the box body is installed above the flue gas descending component. The flue gas descending component is connected to the air inlet of the dust separation device, the air outlet of the dust separation device is connected to the air inlet of the high-temperature fan, and the air outlet of the high-temperature fan is connected to the air inlet of the flue gas rising component. High-temperature, high-dust flue gas is blown into the flue gas descending component by the soot blowing component and then enters the dust separation device for dust separation. The high-temperature, low-dust flue gas after dust separation is extracted by the high-temperature fan and sent into the flue gas rising component and then into the box. The flue gas rising assembly includes a distribution hood and a high-temperature, low-dust flue gas inlet pipe installed at the inlet end of the distribution hood. The high-temperature, low-dust flue gas inlet pipe is connected to the outlet of the high-temperature fan. An air distribution assembly is also installed at the outlet of the distribution hood. The air distribution assembly includes a uniformly distributed air distribution plate that is slidably disposed in the air outlet of the air distribution hood. Corresponding sliding grooves are provided on both inner sides of the air outlet of the air distribution hood. Sliding parts embedded in the sliding grooves are formed on both sides of the uniformly distributed air distribution plate. A first spring is provided between the sliding part and the front wall of the corresponding sliding groove for pulling the uniformly distributed air distribution plate toward the air inlet side of the air distribution hood. Each sliding groove is equipped with a first proximity switch on its rear end wall for detecting the contact of the uniformly distributed air distribution plate. A limiting groove is provided at one end of the uniformly distributed air distribution plate, a second proximity switch is provided in the limiting groove, and a triggering component is provided on the air distribution cover to trigger the second proximity switch after the first proximity switch is triggered. A U-shaped brush with an opening facing downwards is embedded in the hood above the air outlet of the air distribution hood, and a lifting device is installed on the air distribution hood to drive the U-shaped brush to move up and down. After the trigger component triggers the second proximity switch, the lifting device moves to drive the U-shaped brush to remove dust from the evenly distributed air distribution plate.

2. The high-temperature, high-dust flue gas SCR denitrification and soot blowing system according to claim 1, characterized in that, A flow straightening grid is installed in the box near the flue gas inlet, and the catalyst module is located in the box below the flow straightening grid.

3. The high-temperature, high-dust flue gas SCR denitrification and soot blowing system according to claim 1, characterized in that, Each soot blowing assembly includes an air supply pipe with multiple nozzles spaced apart on it, with their actuators facing the catalyst module and the flue gas descending assembly. Both ends of the air supply pipe extend outside the housing and are connected to a compressed air manifold via a jetting control valve.

4. The high-temperature, high-dust flue gas SCR denitrification and soot blowing system according to claim 1, characterized in that, The flue gas downcomer includes a dust collection hood and a high-temperature, high-dust flue gas outlet pipe located at the outlet end of the dust collection hood. The high-temperature, high-dust flue gas outlet pipe is connected to the inlet of the flue gas separation device.

5. The high-temperature, high-dust flue gas SCR denitrification and soot blowing system according to claim 1, characterized in that, The uniformly distributed air distribution plate includes an outer frame and a filter plate that is slidably embedded in the outer frame along the length of the outer frame, with sliding parts formed on both sides of the outer frame; The filter plate has multiple vent holes and both ends are slidably embedded into the outer frame. One end is provided with several second springs connecting the filter plate and the outer frame. The other end has an abutment part that passes through the corresponding side filter plate and the sliding part and extends into the corresponding side sliding groove. The side of the abutment part near the air inlet of the air distribution hood forms a slope. An abutting block is embedded in the air distribution hood corresponding to the abutting part, and a telescopic device is provided on the air distribution hood for driving the abutting block to move linearly along the depth direction of the sliding groove. An infrared proximity sensor is also installed inside the front wall of the sliding groove to detect the resetting of the uniformly distributed air distribution plate.

6. The high-temperature, high-dust flue gas SCR denitrification and soot blowing system according to claim 1, characterized in that, Below the air outlet of the air distribution hood is a dust collection chamber corresponding to the U-shaped brush. The dust collection chamber is connected to the outside of the air distribution hood, and an opening and closing port is provided at the connection port.

7. The high-temperature, high-dust flue gas SCR denitrification and soot blowing system according to claim 1, characterized in that, The triggering component includes a magnetic limiting block embedded in the bottom wall of the sliding groove and an electromagnet disposed in the outer wall of the air distribution hood. A third spring is provided between the electromagnet and the magnetic limiting block.

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