Ultralow-temperature denitration device and use method thereof

Abstract

The invention discloses an ultralow-temperature denitration device and a use method thereof, and belongs to the technical field of gas treatment. The ultralow-temperature denitration device comprises a bottom plate, and further comprises a cooling pipe fixed to the top of the bottom plate; the air inlet pipe is fixed outside the middle section of the cooling pipe, and a flow sensor is arranged on the inner wall; the nitrogen component is arranged in the middle of the top of the bottom plate; the cooling assembly is arranged outside the gas outlet end of the nitrogen assembly, and the fixed end of the cooling assembly is connected with the cooling pipe; the supporting plate is fixed to the top of the bottom plate; the sealing assembly is arranged on the inner side of the supporting plate; the catalysis assembly is arranged in the sealing assembly; the clamping assembly is arranged in the side, away from the cooling pipe, of the catalytic assembly; according to the ultralow-temperature denitration device disclosed by the invention, liquid nitrogen is atomized and sprayed out through the atomizing nozzle to quickly cool waste gas, so that the denitration efficiency of the ultralow-temperature denitration device can be remarkably improved, and the temperature of the waste gas can be quickly reduced to the optimal working range of a catalyst through quick evaporation of the liquid nitrogen.

Description

Technical Field

[0001] The present invention relates to the field of gas processing technology, and in particular to an ultra-low temperature denitration device and a method of using the same. Background Art

[0002] Ultra-low-temperature denitrification (CLT) systems are primarily used to reduce nitrogen oxide (NOx) pollution in industrial emissions, particularly in thermal power generation and steelmaking. With increasingly stringent environmental regulations, traditional CLT denitrification technologies face challenges such as high energy consumption and low efficiency, driving research in CLT denitrification technology. By optimizing system design and material properties, CLT denitrification technology can improve denitrification efficiency, reduce energy consumption, and meet stricter emission standards. With continued technological advancement, CLT denitrification systems are expected to provide effective solutions for environmental pollution control and sustainable resource utilization.

[0003] After searching, the existing patent (publication number: CN221452217U) discloses a denitrification device for an ultra-low temperature boiler, including a reaction chamber, a catalyst mounting rack is provided inside the reaction chamber, and urea catalyst is placed inside the catalyst mounting rack, a bellows is provided on the bottom end pipeline outside the reaction chamber, and a flue gas mixing pipe is provided on the other end pipeline of the bellows, and burning flue gas flows inside the flue gas mixing pipe, and then the flue gas inside the flue gas mixing pipe is guided to the interior of the reaction chamber through the bellows and undergoes a denitrification reaction with the urea catalyst inside the reaction chamber, thereby denitrifying the flue gas, a connecting chamber is provided at the top of the reaction chamber, and an outlet pipe is provided on one side outside the connecting chamber, and the outlet pipe and the connecting chamber are connected by a pipeline, and then the flue gas that has completed denitrification inside the reaction chamber is collected through the connecting chamber and then discharged through the outlet pipe.

[0004] However, during the actual use of the above scheme, the exhaust gas is directly directed into the reaction chamber for denitrification. During this process, the gas may not be cooled to a suitable temperature before entering the reaction chamber to react with the catalyst for denitrification. The activity of the catalyst cannot be fully exerted, resulting in reduced denitrification efficiency and the inability to effectively remove nitrogen oxides. Secondly, incomplete reaction may produce unconverted intermediate products, resulting in increased pollutant emissions and failure to achieve the expected environmental protection effect. Long-term low-temperature operation may also lead to the accumulation of carbon or sediment on the catalyst surface, reducing the service life of the catalyst.

[0005] To this end, the present invention provides an ultra-low temperature denitration device and a method for using the same. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem in the prior art that the gas enters the reaction chamber to react with the catalyst for denitrification before it is cooled to an appropriate temperature, the activity of the catalyst cannot be fully exerted, and the denitrification efficiency is reduced. An ultra-low temperature denitrification device and its use method are proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An ultra-low temperature denitration device and a method of using the same, comprising a base plate and:

[0009] Cooling pipe, fixed to the top of the base plate;

[0010] The air intake pipe is fixed to the outside of the middle section of the cooling pipe, and a flow sensor is provided on its inner wall;

[0011] The nitrogen assembly is located in the middle of the top of the base plate;

[0012] The cooling component is arranged outside the gas outlet of the nitrogen component, and its fixed end is connected to the cooling pipe;

[0013] A support plate, fixed to the top of the base plate;

[0014] A sealing assembly is arranged on the inner side of the support plate;

[0015] A catalytic component is disposed inside the sealing component;

[0016] The clamping assembly is arranged inside the catalyst assembly at a side away from the cooling pipe.

[0017] As a preferred technical solution of the present application, the nitrogen assembly includes a liquid nitrogen barrel fixed to the top of the middle section of the bottom plate, the gas outlet end of the liquid nitrogen barrel is fixedly connected to a first delivery pipe, the middle section of the first delivery pipe is fixedly connected to a control valve, and the first delivery pipe is fixedly connected to a delivery pump on the side away from the control valve.

[0018] As a preferred technical solution of the present application, the cooling component includes a first fixed frame symmetrically fixed to the middle section of the inner wall of the cooling pipe, the first fixed frame is fixedly connected to an evenly distributed connecting rod on the opposite side, the first fixed frame is rotatably connected to the inner side of the second delivery pipe, the second delivery pipe is rotatably connected to the output end of the delivery pump, the second delivery pipe is fixedly connected to a diverter plate on the side away from the first fixed frame, and the outer end of the second delivery pipe is fixedly connected to a propeller.

[0019] As a preferred technical solution of the present application, second fixing frames are symmetrically fixedly connected to both sides of the inner wall of the cooling pipe, and the second fixing frames are rotatably connected to the second conveying pipe.

[0020] As a preferred technical solution of the present application, the sealing assembly includes a denitrification barrel fixed to the inner side of the support plate, and an air outlet pipe is fixedly connected to the outer side of the middle section of the denitrification barrel.

[0021] As a preferred technical solution of the present application, the catalytic assembly includes a catalytic barrel slidably connected to the inner side of the denitrification barrel, and a sealing disk is fixedly connected to the outer end of the catalytic barrel.

[0022] As a preferred technical solution of the present application, the locking assembly includes a limit plate fixed to the inner side of the sealing plate, the outer side of the limit plate is rotatably connected to a transmission plate, the middle section of the inner side of the transmission plate is fixedly connected to a rotating rod, the outer wall of the transmission plate is provided with evenly distributed limit grooves, the inner side of the limit groove is slidably connected to a limit rod, the limit rod is fixedly connected to a locking rod near the side of the catalytic barrel, the locking rod is slidably connected to the limit plate, and the locking rod is locked to the denitrification barrel.

[0023] As a preferred technical solution of the present application, a driving motor is provided inside the control valve and is controlled by a flow sensor inside the intake pipe.

[0024] As a preferred technical solution of the present application, a plurality of honeycomb catalyst plates are detachably connected to the interior of the catalyst barrel.

[0025] A method for using an ultra-low temperature denitration device comprises the following steps:

[0026] S1. Exhaust gas is transported through the intake pipe into the cooling pipe, where it is then diverted to both sides. During this process, the airflow drives the propeller, which in turn drives the second delivery pipe, which in turn drives the diverter plate and atomizing nozzle to rotate synchronously.

[0027] S2. As the diverter disk rotates, a delivery pump extracts liquid nitrogen from the liquid nitrogen tank via the first delivery pipe and delivers it to the second delivery pipe. The liquid nitrogen is then delivered to the diverter disk through the second delivery pipe for diversion. The liquid nitrogen in the diverter disk is evenly distributed by the diverter disk and flows into the atomizing nozzle, which then atomizes the liquid nitrogen into the cooling tube, thereby cooling the gas entering the cooling tube.

[0028] S3. The cooled gas is transported to the interior of the catalytic barrel, where it undergoes a catalytic reaction on the honeycomb catalyst plates inside the barrel, denitrifying the gas. The gas then enters the denitrification barrel and is transported through the outlet pipe to the external nitrogen collection device.

[0029] S4. When cleaning and maintaining the catalytic barrel, you only need to rotate the rotating rod to drive the transmission disc to rotate, and at the same time drive the limit slot to rotate through the transmission disc, thereby driving the limit rod to slide inward at the same time through the limit slot. During the process, the locking rod is driven inward by the limit rod, thereby pulling the locking rod out from the inside of the sealing disc, canceling the engagement with the sealing disc, and then pulling the catalytic barrel out of the denitrification barrel, and then removing the honeycomb catalyst plate from the catalytic barrel, and installing a new honeycomb catalyst plate on the catalytic barrel to complete the replacement. After that, clean and maintain the removed honeycomb catalyst plate for next use.

[0030] Compared with the prior art, the present invention provides an ultra-low temperature denitration device and a method of using the same, which have the following beneficial effects:

[0031] 1. The ultra-low temperature denitration device and its use method described in the present invention can significantly improve the denitration efficiency of the ultra-low temperature denitration device by atomizing and spraying liquid nitrogen through an atomizing nozzle to quickly cool the exhaust gas. The rapid evaporation of liquid nitrogen can quickly reduce the exhaust gas temperature to the optimal operating range of the catalyst, enhance the activity of the catalyst, and efficiently react with the exhaust gas, reduce the formation of intermediate products, improve the completeness of the reaction, and reduce pollutant emissions. In addition, the atomizing spray method can efficiently save energy, reduce dependence on traditional cooling equipment, maintain a stable reaction temperature, avoid the formation of carbon or deposits on the catalyst surface, and extend its service life.

[0032] 2. The ultra-low temperature denitrification device and its use method described in the present invention utilizes airflow to drive the propeller to rotate. Simultaneously, the propeller utilizes a second delivery pipe to drive the diverter plate and atomizing nozzle to rotate, thereby improving the atomization effect of the ultra-low temperature denitrification device. The airflow rotates the nozzle, forming smaller droplets, increasing the contact area between liquid nitrogen and exhaust gas, thereby accelerating cooling and improving denitrification efficiency. Furthermore, the rotating nozzle can more accurately control the injection direction and intensity of the liquid nitrogen, optimizing the temperature control system and ensuring that the exhaust gas is quickly cooled to the optimal operating temperature of the catalyst.

[0033] 3. The ultra-low temperature denitrification device and the method of use thereof described in the present invention can quickly remove the catalytic barrel by rotating the rotating rod, which simplifies the disassembly process, reduces the complexity of manual operation, saves time and labor costs, and at the same time improves operational safety and reduces maintenance costs. In addition, it optimizes the modularity and flexibility of the equipment, simplifies the regular inspection and replacement process of the catalytic barrel, reduces downtime, and improves system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a three-dimensional Figure 1 ;

[0035] Figure 2 The present invention is a three-dimensional Figure 2 ;

[0036] Figure 3 is a cross-sectional view of a cooling tube of the present invention;

[0037] Figure 4 It is a partial three-dimensional schematic diagram of the second delivery pipe in the present invention;

[0038] Figure 5 is a cross-sectional view of the sealing disk of the present invention;

[0039] Figure 6is a cross-sectional view of a denitration barrel of the present invention;

[0040] Figure 7 It is a cross-sectional view of the transmission plate of the present invention.

[0041] In the picture:

[0042] 1. Bottom plate; 11. Support plate; 2. Denitrification barrel; 21. Transmission plate; 22. Limiting plate; 23. Rotating rod; 24. Limiting groove; 25. Limiting rod; 26. Engaging rod; 3. Sealing plate; 31. Catalytic barrel; 32. Exhaust pipe; 4. First fixed frame; 41. Connecting rod; 42. Delivery pump; 43. First delivery pipe; 44. Control valve; 45. Liquid nitrogen barrel; 46. Second delivery pipe; 47. Diverter plate; 48. Atomizing nozzle; 49. Propeller; 410. Second fixed frame; 5. Cooling pipe; 51. Inlet pipe. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Example:

[0045] Reference Figure 1-7 , an ultra-low temperature denitration device, comprising a bottom plate 1, and further comprising:

[0046] The cooling pipe 5 is fixed on the top of the bottom plate 1, and the cooling pipe 5 is supported and fixed by the bottom plate 1;

[0047] The intake pipe 51 is fixed to the outside of the middle section of the cooling pipe 5. A flow sensor is provided on its inner wall. The cooling pipe 5 supports and fixes the intake pipe 51. At the same time, the internal flow sensor monitors the exhaust gas flow inside the intake pipe 51.

[0048] The nitrogen assembly is arranged in the middle of the top of the base plate 1, and the nitrogen assembly is supported and limited by the base plate 1;

[0049] The cooling component is arranged outside the nitrogen component outlet end, and its fixed end is connected to the cooling pipe 5, and the cooling pipe 5 supports and limits the cooling component;

[0050] The support plate 11 is fixed on the top of the base plate 1, and the base plate 1 supports and fixes the multiple support plates 11;

[0051] The sealing assembly is arranged inside the support plate 11, and the sealing assembly is supported and limited by the support plate 11;

[0052] The catalytic component is arranged inside the sealing component, and the catalytic component is stored by the sealing component;

[0053] The snap-fit ​​assembly is arranged inside the catalyst assembly on a side away from the cooling pipe 5 , and the catalyst assembly and the sealing assembly are connected via the snap-fit ​​assembly.

[0054] The nitrogen assembly includes a liquid nitrogen barrel 45 fixed to the top of the middle section of the base plate 1, and the liquid nitrogen barrel 45 is supported and fixed by the base plate 1. The gas outlet end of the liquid nitrogen barrel 45 is fixedly connected to the first delivery pipe 43, and the first delivery pipe 43 is supported and fixed by the liquid nitrogen barrel 45. The middle section of the first delivery pipe 43 is fixedly connected to a control valve 44, and the control valve 44 is supported and fixed by the first delivery pipe 43. At the same time, the flow rate of liquid nitrogen inside the first delivery pipe 43 is controlled by the control valve 44. The first delivery pipe 43 is fixedly connected to a delivery pump 42 on the side away from the control valve 44. The liquid nitrogen in the first delivery pipe 43 is extracted by the delivery pump 42, and the flow rate of liquid nitrogen inside the first delivery pipe 43 is controlled by the control valve 44.

[0055] The cooling component includes a first fixing frame 4 symmetrically fixed to the middle section of the inner wall of the cooling pipe 5, and the first fixing frame 4 is supported and fixed by the cooling pipe 5. The opposite side of the first fixing frame 4 is fixedly connected to a uniformly distributed connecting rod 41, and the first fixing frames 4 on both sides are connected by the connecting rod 41. The inner side of the first fixing frame 4 is rotatably connected to the second delivery pipe 46, and the second delivery pipe 46 is rotatably connected to the output end of the delivery pump 42. The second delivery pipe 46 is limited by the first fixing frame 4 so that the second delivery pipe 46 rotates inside the first fixing frame 4. The second delivery pipe 46 is fixedly connected to a diverter plate 47 on the side away from the first fixing frame 4, and the diverter plate 47 is supported and fixed by the second delivery pipe 46. At the same time, the diverter plate 47 is driven to rotate synchronously by the second delivery pipe 46. The outer end of the second delivery pipe 46 is fixedly connected to a propeller 49, and the propeller 49 is supported and fixed by the second delivery pipe 46.

[0056] The second fixing frame 410 is symmetrically fixedly connected to the inner wall of the cooling pipe 5 on both sides. The second fixing frame 410 is rotatably connected to the second conveying pipe 46. The second fixing frame 410 is supported and fixed by the cooling pipe 5, and the second conveying pipe 46 is limited by the second fixing frame 410.

[0057] The sealing assembly includes a denitrification barrel 2 fixed to the inner side of a support plate 11 , which supports and fixes the denitrification barrel 2 . An air outlet pipe 32 is fixedly connected to the outer side of the middle section of the denitrification barrel 2 , which supports and fixes the air outlet pipe 32 through the denitrification barrel 2 .

[0058] The catalytic assembly includes a catalytic barrel 31 slidably connected to the inner side of the denitrification barrel 2. The catalytic barrel 31 is limited by the denitrification barrel 2. The outer end of the catalytic barrel 31 is fixedly connected to a sealing disk 3, which is supported and fixed by the catalytic barrel 31.

[0059] The locking assembly includes a limit plate 22 fixed to the inner side of the sealing plate 3, the limit plate 22 is supported and fixed by the sealing plate 3, the outer side of the limit plate 22 is rotatably connected to the transmission plate 21, the transmission plate 21 is limited by the limit plate 22, the middle section of the inner side of the transmission plate 21 is fixedly connected to the rotation rod 23, the rotation rod 23 is supported and fixed by the transmission plate 21, and the transmission plate 21 is driven to rotate by rotating the rotation rod 23. The outer wall of the transmission plate 21 is provided with uniformly distributed limit grooves 24, and the limit grooves 24 are driven to rotate synchronously by the rotation of the transmission plate 21. The limiting groove 24 is rotated step by step, and the limiting rod 25 is slidably connected to the inner side of the limiting groove 24. The limiting rod 25 is driven to move by the rotation of the limiting groove 24. The limiting rod 25 is fixedly connected with a locking rod 26 on the side close to the catalytic barrel 31. The limiting rod 25 moves and the locking rod 26 is driven to move at the same time. The locking rod 26 is slidably connected to the limiting plate 22, and the locking rod 26 is limited by the limiting plate 22. The locking rod 26 is locked and connected to the denitrification barrel 2. The locking rod 26 and the denitrification barrel 2 are mutually engaged, so that the denitrification barrel 2 and the sealing plate 3 are locked and fixed.

[0060] A driving motor is provided inside the control valve 44 and is controlled by a flow sensor inside the air intake pipe 51 . The flow sensor inside the air intake pipe 51 controls the driving motor inside the control valve 44 , thereby controlling the flow of liquid nitrogen inside the first delivery pipe 43 .

[0061] A plurality of honeycomb catalyst plates are detachably connected inside the catalyst barrel 31 . The honeycomb catalyst plates are fixed to the catalyst barrel 31 by bolts. The honeycomb catalyst plates can be disassembled by removing the bolts.

[0062] A method for using an ultra-low temperature denitration device comprises the following steps:

[0063] S1. Exhaust gas is transported into the cooling pipe 5 through the intake pipe 51 and then split by the cooling pipe 5, diverting the exhaust gas to both sides. During this process, the airflow drives the propeller 49 to rotate, which in turn drives the second delivery pipe 46 to rotate, and the second delivery pipe 46 drives the diverter plate 47 and the atomizing nozzle 48 to rotate synchronously.

[0064] S2. As the diverter plate 47 rotates, the liquid nitrogen in the liquid nitrogen tank 45 is extracted by the delivery pump 42 through the first delivery pipe 43 and delivered to the second delivery pipe 46. The liquid nitrogen is then delivered to the diverter plate 47 through the second delivery pipe 46 for diversion. The liquid nitrogen in the diverter plate 47 is evenly distributed by the diverter plate 47 and evenly flows into the atomizing nozzle 48. The atomizing nozzle 48 then atomizes the liquid nitrogen into the cooling tube 5, thereby cooling the gas entering the cooling tube 5.

[0065] S3. The cooled gas is transported into the catalytic barrel 31, where it undergoes a catalytic reaction on the honeycomb catalyst plate inside the catalytic barrel 31 to denitrate the gas. The gas then enters the denitration barrel 2 and is transported through the outlet pipe 32 to the external nitrogen collection device.

[0066] S4. When cleaning and maintaining the catalytic barrel 31, you only need to rotate the rotating rod 23 to drive the transmission disc 21 to rotate, and at the same time drive the limiting groove 24 to rotate through the transmission disc 21, thereby driving the limiting rod 25 to slide inward at the same time through the limiting groove 24. During the process, the limiting rod 25 drives the engaging rod 26 to move inward, thereby pulling the engaging rod 26 out from the inside of the sealing disc 3, canceling the engagement with the sealing disc 3, and then pulling the catalytic barrel 31 out of the denitrification barrel 2, and then removing the honeycomb catalyst plate from the catalytic barrel 31, and installing a new honeycomb catalyst plate on the catalytic barrel 31 to complete the replacement, and then cleaning and maintaining the removed honeycomb catalyst plate for next use.

[0067] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An ultra-low temperature denitration device, comprising a bottom plate (1), characterized in that: Also includes: A cooling pipe (5) is fixed to the top of the base plate (1); An air inlet pipe (51) is fixed to the outside of the middle section of the cooling pipe (5), and a flow sensor is provided on the inner wall of the air inlet pipe; A nitrogen assembly is arranged at the top middle section of the bottom plate (1); A cooling component is arranged outside the nitrogen component outlet end, and its fixed end is connected to the cooling pipe (5); A support plate (11) is fixed to the top of the base plate (1); A sealing assembly is arranged inside the support plate (11); A catalytic component is disposed inside the sealing component; The engaging assembly is arranged inside the catalytic assembly on a side away from the cooling pipe (5).

2. The ultra-low temperature denitration device according to claim 1, characterized in that: The nitrogen assembly comprises a liquid nitrogen barrel (45) fixed to the top of the middle section of the bottom plate (1); a gas outlet end of the liquid nitrogen barrel (45) is fixedly connected to a first delivery pipe (43); a middle section of the first delivery pipe (43) is fixedly connected to a control valve (44); and a delivery pump (42) is fixedly connected to the side of the first delivery pipe (43) away from the control valve (44).

3. The ultra-low temperature denitration device according to claim 2, characterized in that: The cooling component comprises a first fixing frame (4) symmetrically fixed to the middle section of the inner wall of the cooling pipe (5); the first fixing frame (4) is fixedly connected to an evenly distributed connecting rod (41) on the opposite side; the first fixing frame (4) is rotatably connected to the inner side of the first fixing frame (4); the second conveying pipe (46) is rotatably connected to the output end of the conveying pump (42); the second conveying pipe (46) is fixedly connected to a diverter plate (47) on the side away from the first fixing frame (4); and the outer end of the second conveying pipe (46) is fixedly connected to a propeller (49).

4. The ultra-low temperature denitration device according to claim 3, characterized in that: A second fixing frame (410) is symmetrically fixedly connected to both sides of the inner wall of the cooling pipe (5), and the second fixing frame (410) is rotatably connected to the second conveying pipe (46).

5. The ultra-low temperature denitration device according to claim 4, characterized in that: The sealing assembly comprises a denitration barrel (2) fixed to the inner side of a support plate (11), and an air outlet pipe (32) is fixedly connected to the outer side of the middle section of the denitration barrel (2).

6. The ultra-low temperature denitration device according to claim 1, characterized in that: The catalytic assembly comprises a catalytic barrel (31) slidably connected to the inner side of the denitration barrel (2), and a sealing disk (3) is fixedly connected to the outer end of the catalytic barrel (31).

7. The ultra-low temperature denitration device according to claim 1, characterized in that: The clamping assembly comprises a limit plate (22) fixed to the inner side of the sealing plate (3); the outer side of the limit plate (22) is rotatably connected to a transmission plate (21); the inner middle section of the transmission plate (21) is fixedly connected to a rotation rod (23); the outer wall of the transmission plate (21) is provided with uniformly distributed limit grooves (24); the inner side of the limit groove (24) is slidably connected to a limit rod (25); the limit rod (25) is fixedly connected to a clamping rod (26) on a side close to the catalytic barrel (31); the clamping rod (26) is slidably connected to the limit plate (22); and the clamping rod (26) is clamped and connected to the denitration barrel (2).

8. The ultra-low temperature denitration device according to claim 2, characterized in that: A driving motor is provided inside the control valve (44) and is controlled by a flow sensor inside the air intake pipe (51).

9. The ultra-low temperature denitration device according to claim 6, characterized in that: A plurality of honeycomb catalyst plates are detachably connected inside the catalyst barrel (31).

10. A method for using an ultra-low temperature denitration device, characterized in that: The steps include: S1. The exhaust gas is transported into the interior of the cooling pipe (5) through the air inlet pipe (51), and then diverted by the cooling pipe (5), diverting the exhaust gas to both sides. During the process, the propeller (49) is driven to rotate by the air flow, and the propeller (49) drives the second delivery pipe (46) to rotate. At the same time, the second delivery pipe (46) drives the diverter plate (47) and the atomizing nozzle (48) to rotate synchronously; S2. During the rotation of the diverter disk (47), the liquid nitrogen in the liquid nitrogen barrel (45) is extracted by the delivery pump (42) through the first delivery pipe (43) and delivered to the second delivery pipe (46). The liquid nitrogen is then delivered to the diverter disk (47) through the second delivery pipe (46) for diversion. The liquid nitrogen in the diverter disk (47) is diverted by the diverter disk (47) and evenly enters the atomizing nozzle (48). The liquid nitrogen is atomized and sprayed into the cooling pipe (5) by the atomizing nozzle (48), thereby cooling the gas entering the cooling pipe (5). S3. The cooled gas is transported into the interior of the catalytic barrel (31), and then the honeycomb catalyst plate inside the catalytic barrel (31) catalyzes the gas entering the catalytic barrel (31) to denitrate. The gas then enters the denitrification barrel (2) and is transported into the external nitrogen collection device through the outlet pipe (32); S4. When cleaning and maintaining the catalytic barrel (31), it is only necessary to rotate the rotating rod (23), and the rotating rod (23) drives the transmission disc (21) to rotate, and at the same time, the transmission disc (21) drives the limiting groove (24) to rotate, thereby driving the limiting rod (25) to slide inward at the same time through the limiting groove (24). During the process, the limiting rod (25) drives the engaging rod (26) to move inward, thereby extracting the engaging rod (26) from the inside of the sealing disc (3), canceling the engagement with the sealing disc (3), and then extracting the catalytic barrel (31) from the denitrification barrel (2), and then removing the honeycomb catalyst plate from the catalytic barrel (31), and installing a new honeycomb catalyst plate on the catalytic barrel (31), completing the replacement, and then cleaning and maintaining the removed honeycomb catalyst plate for next use.

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