Flue gas low-temperature denitration device and use method thereof

Abstract

The invention discloses a flue gas low-temperature denitration device and a using method thereof, and relates to the technical field of flue gas denitration.The flue gas low-temperature denitration device comprises a flue gas inlet box, a transition box is fixedly installed on one side of the flue gas inlet box, a catalysis box and an injection mechanism are fixedly installed on one side of the transition box, and the injection mechanism comprises a circulation main pipe and a rotating ring; the circulating main pipes are mounted in the smoke inlet box in an array manner; the rotating rings are movably mounted on the circulating main pipes; the static mixing mechanism comprises a first mounting plate and a static mixing fixing piece, and the first mounting plate is fixedly mounted in the smoke inlet box. According to the flue gas denitration device, the flue gas can be fully mixed through the injection mechanism with the functions of forming a reducing agent layer, further mixing the flue gas and a reducing agent and forming a plurality of upstreams, so that the denitration efficiency of the device is improved, and in addition, the device is further provided with the static mixing mechanism matched with the injection mechanism; therefore, the mixing effect of the flue gas and the reducing agent is better.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitration, and specifically to a low-temperature flue gas denitration device and a method for using the same. Background Art

[0002] Low-temperature flue gas denitration refers to the process of reducing or converting nitrogen oxides in flue gas into harmless nitrogen and water through specific technical means under relatively low temperature conditions. Its core is to use methods such as low-temperature catalysts, reducing agents, or oxidation absorption to achieve efficient denitration without relying on high-temperature environments, and it is applicable to industrial scenarios with small flue gas volumes or where the traditional high-temperature denitration temperature cannot be reached. Existing denitration devices mostly carry out denitration in a denitration tower by spraying reducing agents and contacting with catalysts.

[0003] However, in the actual use process, there are the following problems: First, due to the relatively fast initial velocity of the flue gas, it may not be fully mixed with the reducing agent during the process of passing through the reducing agent spraying layer, resulting in low denitration efficiency of the equipment; second, the flue gas itself contains many pollutant particles, and the presence of these particles will affect the denitration efficiency, and ordinary filter layers are prone to blockage during long-term use; third, when the flue gas flows towards the catalyst layer, it is not perpendicular to the catalyst layer, so the flue gas cannot evenly blow on the catalyst layer, and there will be a situation where some catalyst particles are over-consumed. Existing devices do not have the function of controlling the flue gas flow direction, thus reducing the reaction efficiency between the catalytic flue gas and the reducing agent of the equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-temperature flue gas denitration device and a method for using the same to solve the problems of insufficient mixing of flue gas and reducing agent, unsuitability of ordinary filtration methods for long-term use, and uneven use degree of catalyst particles proposed in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A low-temperature flue gas denitration device and a method for using the same, including a smoke inlet box, a transition box fixedly installed on one side of the smoke inlet box, a catalytic box, a spraying mechanism, the spraying mechanism includes a circulation main pipe and a rotating ring, the circulation main pipes are arrayed and installed in the smoke inlet box, and the rotating ring is movably installed on the circulation main pipe; A static mixing mechanism, the static mixing mechanism includes a first mounting plate and static mixing fasteners, the first mounting plate is fixedly installed in the smoke inlet box, and the static mixing fasteners are arrayed and movably arranged in the first mounting plate; A filtering mechanism, the filtering mechanism includes a filter plate, a dust receiving box, and a cleaning brush, the filter plate is movably installed in the transition box, a dust receiving box is arranged below the transition box, and two groups of cleaning brushes are rotatably installed in the dust receiving box; Flow regulating mechanism, the flow regulating mechanism includes an enclosing layer and a flow guiding plate, the enclosing layer is rotatably installed in the catalytic box, and a flow guiding plate is arranged inside the enclosing layer; Catalyst mounting plates are arrayedly installed in the catalytic box.

[0006] Preferably, the injection mechanism includes a main flow pipe, injection nozzles, a first limiting ring, a rotating ring, a rotating loop, injection inclined holes and a mixing fan. Injection nozzles are arrayedly arranged on the main flow pipe. First limiting rings are fixedly installed on the injection nozzles. A rotating ring is rotatably installed on the first limiting ring. Ball bearings are arrayedly and rotatably installed inside the rotating ring and the ball bearings abut against the upper and lower sides of the first limiting ring. A rotating loop is fixedly installed on the rotating ring. Injection inclined holes are arrayedly formed in the rotating loop. The rotating ring communicates with the rotating loop. A mixing fan is fixedly installed on the rotating loop.

[0007] Preferably, the injection mechanism includes a first screw sleeve, a clamping block and a first screw rod. A group of the rotating ring, the rotating loop and the mixing fan can all be divided into two parts along the center of the circle. A first screw sleeve is fixedly installed inside the left part of a group of the mixing fans. A clamping block is fixedly installed on the right part of the mixing fan. The two parts of a group of the mixing fans are staggered and engaged with each other. The clamping block is located directly above the first screw sleeve. A first screw rod is movably inserted into the clamping block. The first screw rod is installed in the first screw sleeve by means of a thread. The thickness of the center of the blade of the mixing fan is greater than the thickness of the edge.

[0008] Preferably, the injection mechanism includes a first sealing block, a sealing ring, a threaded pipe orifice, a first installation groove, a second screw sleeve, a second screw rod, a reductant pump, a shunt head, a threaded sleeve and a second limiting ring. A first sealing block is fixedly installed at one end of the main flow pipe. A threaded pipe orifice is fixedly installed at one end of the first sealing block. The threaded pipe orifice communicates with the main flow pipe. A sealing ring is fixedly installed on the first sealing block. First installation grooves are arrayedly formed on one side of the smoke inlet box. The size of the first installation grooves is adapted to the size of the first sealing block and the first sealing block is inserted into the first installation grooves. Second screw sleeves are fixedly installed on the outer sides of the corners of the first installation grooves. Second screw rods are movably inserted into the corners of the sealing ring. The second screw rods are installed in the second screw sleeves by means of a thread. A reductant pump is fixedly installed on the smoke inlet box. Shunt heads are arrayedly and fixedly installed on the water outlet pipe of the reductant pump. A threaded sleeve is rotatably installed on the shunt head. The threaded sleeve is installed on the threaded pipe orifice by means of a thread. Second limiting rings are arrayedly and fixedly installed on the inner side of the smoke inlet box. One end of the main flow pipe is inserted into the second limiting rings.

[0009] Preferably, the static mixing mechanism includes a first mounting plate, mounting circular grooves, a second mounting plate, and static mixing fasteners. The first mounting plate is arrayed with mounting circular grooves, and the positions of the mounting circular grooves are opposite to those of the injection nozzles. A second mounting plate is arranged on the upper side of the first mounting plate, and static mixing fasteners are fixedly mounted on the lower side of the second mounting plate in an array. The static mixing fasteners are inserted into the mounting circular grooves respectively.

[0010] Preferably, the static mixing mechanism includes a connecting plate, a fourth screw, a second mounting groove, a fourth screw sleeve, and a handle. A connecting plate is fixedly mounted on one side of the second mounting plate. The fourth screws are movably inserted at the four corners of the connecting plate. A second mounting groove is formed on one side of the smoke inlet box, and fourth screw sleeves are fixedly mounted on the outer sides of the four corners of the second mounting groove. The fourth screws are threadedly mounted in the fourth screw sleeves. Two groups of handles are fixedly mounted on the connecting plate. The height of the second mounting groove is greater than the sum of the heights of the second mounting plate and the static mixing fasteners.

[0011] Preferably, the filtering mechanism includes a filter plate, a double-sided rack, a third mounting groove, a connecting rotating rod, a first gear, a second gear, a first sealing cover, a first motor, a dust receiving box, and a cleaning brush. The filter plate is movably inserted into the transition box. Double-sided racks are fixedly mounted on both sides of the filter plate. Two groups of third mounting grooves are formed on the lower side of the transition box. Connecting rotating rods are rotatably mounted in the third mounting grooves. First gears are fixedly mounted at both ends of the connecting rotating rods. The first gears are meshed with the double-sided racks. Second gears are fixedly mounted at one ends of the two groups of connecting rotating rods. The two groups of second gears are rotatably mounted on the outer side of the transition box. The two groups of second gears are meshed with each other. A first sealing cover is fixedly mounted on the outer side of the transition box. The two groups of second gears are located in the first sealing cover. A first motor is fixedly mounted on the outer side of the first sealing cover. The output shaft of the first motor is fixedly mounted on one of the second gears. The lower side of the first sealing cover is not closed. A dust receiving box is arranged on the lower side of the transition box. The height of the dust receiving box is adapted to the height of the filter plate. Two groups of cleaning brushes are rotatably mounted in the dust receiving box. The distance between the two groups of cleaning brushes is adapted to the width of the filter plate.

[0012] Preferably, the filtering mechanism includes a fifth mounting groove, a third gear, a fourth gear, a second sealing cover, a limiting block, a fifth screw sleeve, a limiting frame and a fifth screw rod. A fifth mounting groove is formed on one side of the dust receiving box. Four groups of third gears are rotatably mounted in the fifth mounting groove. The four groups of third gears are meshed with each other. The third gears on both sides are fixedly connected to the cleaning brush. Two groups of fourth gears are rotatably mounted on the outer side of the dust receiving box. The two groups of fourth gears are not meshed with each other and are fixedly connected to the third gears on both sides. A second sealing cover is fixedly mounted on the outer side of the dust receiving box. The two groups of fourth gears are both located inside the second sealing cover. The upper side of the second sealing cover is not closed. The upper side of the second sealing cover is combined with the lower side of the first sealing cover. The two groups of fourth gears are respectively meshed with the two groups of second gears. Limiting blocks are fixedly mounted at the four corners of the dust receiving box. A fifth screw sleeve is fixedly mounted inside the limiting block. Limiting frames are fixedly mounted at the four corners of the lower side of the transition box. The first sealing cover is inserted on the limiting block. A fifth screw rod is movably inserted on the limiting frame. The fifth screw rod is threadedly mounted in the fifth screw sleeve.

[0013] Preferably, the flow regulating mechanism includes a connecting main rod, an enclosing layer, a flow guiding plate, a first flow dividing hole, a second flow dividing hole, a fifth gear, a transmission rod, a sixth gear, a third sealing cover and a second motor. Two groups of connecting main rods are rotatably mounted in the catalytic box. The connecting main rods are located above the uppermost catalyst mounting plate. Enclosing layers are fixedly mounted on the outer sides of the connecting main rods. Flow guiding plates are fixedly mounted on the connecting main rods. The edges of the flow guiding plates do not contact the enclosing layers. First flow dividing holes are arranged in an array on the enclosing layers. Second flow dividing holes are arranged in an array on the sides of the connecting main rods and the enclosing layers. The width of the enclosing layer is half of the width of the catalytic box. Four groups of fifth gears are rotatably mounted on the outer side of the catalytic box. The two outer groups of fifth gears are fixedly connected to the connecting main rods. The two middle groups of fifth gears are meshed with each other. Transmission rods are rotatably mounted on the outer and middle fifth gears. A sixth gear is rotatably mounted on the outer side of the catalytic box. The sixth gear is meshed with one of the outer fifth gears. A third sealing cover is fixedly mounted on the outer side of the catalytic box. The fifth gears and the sixth gear are both arranged inside the third sealing cover. A second motor is fixedly mounted on the third sealing cover. The output shaft of the second motor is fixedly connected to the sixth gear.

[0014] Preferably, S1: The flue gas enters from the inlet flue gas box, the reductant pump pumps in the reductant, the reductant sprays out from the injection inclined holes, the mixing fan rotates, the mixing fan mixes the reductant and the flue gas, and forms an upward mixed gas flow, which enters the installation circular groove, and then is statically mixed under the guidance of the static mixing member, and then continues to rise and enters the transition box. After being filtered by the cleaning brush, it is on the upper side of the surrounding layer, and enters the catalyst installation plate under the guidance of the guide plate for accelerated denitrification; S2: When the injection mechanism needs to be disassembled, the corresponding threaded sleeve and the second screw rod are screwed out, then the first sealing block is pulled out, and the first screw rod is screwed out to separate the rotating ring, the rotating ring and the mixing fan; S3: When the static mixing member needs to be cleaned, the fourth screw rod is screwed out from the fourth screw sleeve, then the second installation plate is lifted by the handle, and then the static mixing member can be pulled out; S4: When the filter plate needs to be cleaned, the first motor is started. At this time, the filter plate descends, and the cleaning brush rotates. At this time, the cleaning brush cleans the surface of the filter plate. When the dust receiving box is disassembled, the fifth screw rod is screwed out from the fifth screw sleeve, and then the limiting frame and the limiting block can be separated; S5: When using the flow regulating mechanism, the second motor is started, so that the connecting main rod can drive the surrounding layer and the guide plate to rotate. When the two surrounding layers are completely parallel, the catalytic box can be closed but the mixed gas flow can still pass through at a low rate. The user can determine the flow direction and passing rate of the gas flow by adjusting the angle of the surrounding layer.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention has an injection mechanism with the functions of forming a reductant layer, further mixing the flue gas and the reductant, and forming multiple upward gas flows, so that the flue gas can be fully mixed, thereby improving the efficiency of the equipment during denitrification. In addition, the equipment is also provided with a static mixing mechanism that cooperates with the injection mechanism, so that the mixing effect of the flue gas and the reductant is better, and the static mixing member therein can be conveniently cleaned, increasing the convenience during equipment maintenance; 2. The present invention is also provided with a filtering mechanism with self-cleaning ability, so that the filter plate can be quickly self-cleaned when it is blocked or the like, thereby restoring its use effect, increasing the functionality of the equipment, and reducing the maintenance frequency of the equipment. The equipment is also provided with a flow regulating mechanism with the ability to adjust the flow direction of the mixed flue gas, so that the catalyst installation plate can evenly receive the mixed flue gas, increasing the use efficiency of the catalyst installation plate and also improving the denitrification efficiency of the equipment. Description of the Drawings

[0016] Figure 1 Schematic diagram of the overall structure provided by the embodiment of the present invention; Figure 2 Rear view schematic diagram of the structure provided by the embodiment of the present invention; Figure 3 Schematic cross-sectional view of the structure at the smoke inlet box provided by the embodiment of the present invention; Figure 4 Schematic diagram of the structure at the main flow pipe provided by the embodiment of the present invention; Figure 5 Schematic separation diagram of the structure at the main flow pipe provided by the embodiment of the present invention; Figure 6 Schematic separation diagram of the structure at the static mixing mechanism provided by the embodiment of the present invention; Figure 7 Schematic separation diagram of the structure at the filter plate provided by the embodiment of the present invention; Figure 8 Schematic separation diagram of the structure at the dust receiving box provided by the embodiment of the present invention; Figure 9 Schematic cross-sectional view of the structure at the catalytic box provided by the embodiment of the present invention; Figure 10 Schematic diagram of the structure at the main connecting rod provided by the embodiment of the present invention; Figure 11 provided by the embodiment of the present invention Figure 7 Partial enlarged schematic diagram of A in; Figure 12 provided by the embodiment of the present invention Figure 9 Partial enlarged schematic diagram of B in.

[0017] In the figure: 1, smoke inlet box; 2, transition box; 3, catalytic box; 4, injection mechanism; 401, main circulation pipe; 402, injection nozzle; 403, first limit ring; 404, rotating ring; 405, rotating loop; 406, injection inclined hole; 407, mixing fan; 408, first screw sleeve; 409, engaging block; 410, first screw rod; 411, first sealing block; 412, sealing ring; 413, threaded pipe orifice; 414, first installation groove; 415, second screw sleeve; 416, second screw rod; 417, reductant pump; 418, shunt head; 419, threaded sleeve; 420, second limit ring; 5, static mixing mechanism; 501, first mounting plate; 502, mounting round groove; 503, second mounting plate; 504, static mixing fastener; 505, connecting plate; 506, fourth screw rod; 507, second installation groove; 508, fourth screw sleeve; 509, handle; 6, filtering mechanism; 601, filter plate; 602, double-sided rack; 603, third installation groove; 604, connecting rotating rod; 605, first gear; 606, second gear; 607, first sealing cover; 608, first motor; 609, dust receiving box; 610, cleaning brush; 611, fifth installation groove; 612, third gear; 613, fourth gear; 614, second sealing cover; 615, limiting block; 616, fifth screw sleeve; 617, limiting frame; 618, fifth screw rod; 7, flow regulating mechanism; 701, connecting main rod; 702, surrounding layer; 703, flow guiding plate; 704, first shunt hole; 705, second shunt hole; 706, fifth gear; 707, transmission rod; 708, sixth gear; 709, third sealing cover; 710, second motor; 8, catalyst mounting plate. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 12 , the present invention provides a technical solution: a flue gas low-temperature denitration device and its use method, including a smoke inlet box 1, a transition box 2 fixedly installed on one side of the smoke inlet box 1, a catalytic box 3 fixedly installed on one side of the transition box 2, an injection mechanism 4, the injection mechanism 4 includes a main circulation pipe 401 and a rotating loop 405, the main circulation pipes 401 are arrayed and installed in the smoke inlet box 1, and the rotating loop 405 is movably installed on the main circulation pipe 401; The static mixing mechanism 5 includes a first mounting plate 501 and static mixing fasteners 504. The first mounting plate 501 is fixedly installed in the smoke inlet box 1, and the static mixing fasteners 504 are arranged in an array and movably in the first mounting plate 501; The filtering mechanism 6 includes a filter plate 601, a dust receiving box 609 and a cleaning brush 610. The filter plate 601 is movably installed in the transition box 2. A dust receiving box 609 is arranged on the lower side of the transition box 2, and two groups of cleaning brushes 610 are rotatably installed in the dust receiving box 609; The flow regulating mechanism 7 includes an enclosing layer 702 and a flow guiding plate 703. The enclosing layer 702 is rotatably installed in the catalytic box 3, and a flow guiding plate 703 is arranged in the enclosing layer 702; Catalyst mounting plates 8 are installed in the catalytic box 3 in an array. This device can make the reducing agent ejected from the injection nozzle 402 perform annular injection, so as to form a reducing agent layer with a wide coverage area, which can be fully mixed with the flue gas, and form an upward air flow after being rotationally mixed by the mixing fan 407, and then be remixed by the corresponding static mixing fasteners 504, be filtered when passing through the filtering mechanism 6, and finally enter the catalyst mounting plate 8 under the guidance and regulation of the flow regulating mechanism 7 for an accelerated reaction. Compared with the traditional reducing agent injection and mixing method, the flue gas and the reducing agent in this device have a higher mixing degree, and through the filtering and air flow guiding design, the denitration efficiency of the device for the flue gas is further improved.

[0020] Furthermore, the injection mechanism 4 includes a circulation main pipe 401, injection nozzles 402, first limit rings 403, rotating rings 404, rotating rings 405, injection inclined holes 406 and mixing fans 407. Injection nozzles 402 are arranged in an array on the circulation main pipe 401. First limit rings 403 are fixedly installed on the injection nozzles 402. Rotating rings 404 are rotatably installed on the first limit rings 403. Ball bearings are arranged in an array in the rotating rings 404 and the ball bearings abut against the upper and lower sides of the first limit rings 403. Rotating rings 405 are fixedly installed on the rotating rings 404. Injection inclined holes 406 are arranged in an array on the rotating rings 405. The rotating rings 404 are communicated with the rotating rings 405. Mixing fans 407 are fixedly installed on the rotating rings 405. The schematic diagram of this structure is Figure 5, the ball bearings provided inside the rotating ring 404 can significantly reduce the frictional force of the rotating ring 404 during rotation, enabling the rotating ring 405 to rotate at high speed under the action of pressure. As a result, the sprayed reducing agent forms a plane centered on the rotating ring 405. The combined use of multiple groups of rotating rings 405 can form a plane for reducing agent spraying in the smoke inlet box 1, allowing the flue gas to come into full contact with the reducing agent during the upward process and increasing the mixing efficiency of the flue gas and the reducing agent. The provided mixing fan 407 can further mix the flue gas and the reducing agent and form an upward air flow with the mixed gas, thereby forming multiple flows entering the static mixing mechanism 5, achieving the split mixing of the flue gas and further increasing the mixing efficiency of the flue gas; Furthermore, the spraying mechanism 4 includes a first screw sleeve 408, a clamping block 409, and a first screw rod 410. A set of rotating rings 404, rotating rings 405, and mixing fans 407 can all be divided into two parts along the center of the circle. The left part of a set of mixing fans 407 is fixedly installed with a first screw sleeve 408, and the right part of the mixing fan 407 is fixedly installed with a clamping block 409. The two parts of a set of mixing fans 407 are staggered and combined. The clamping block 409 is located directly above the first screw sleeve 408. A first screw rod 410 is movably inserted into the clamping block 409, and the first screw rod 410 is installed in the first screw sleeve 408 through threads. The thickness of the center of the blade of the mixing fan 407 is greater than that of the edge. The schematic diagram of this structure is Figure 5 , this structure enables the rotating rings 404, rotating rings 405, and mixing fans 407 to be easily disassembled without affecting their functionality, allowing for quick replacement in case of damage during equipment maintenance. Moreover, this structure is simple, and its functionality is achieved through the shape of the parts themselves, so it has good stability and performs well during long-term use and under harsh conditions. In addition, the shape of the blades of the mixing fan 407 enables the blades to be easily aligned and assembled after being separated, increasing the convenience of equipment installation. Since the functions of the parts are achieved through their shapes, the requirements for the processing accuracy of the parts are low. Coupled with its easy disassembly characteristics, the requirements for the material of the parts are not high either. Multiple groups of parts can be made universal during assembly, so the implementation cost of this function is low; Further, the injection mechanism 4 includes a first sealing block 411, a sealing ring 412, a threaded pipe orifice 413, a first installation groove 414, a second screw sleeve 415, a second screw rod 416, a reductant pump 417, a flow splitter 418, a threaded sleeve 419 and a second limiting ring 420. One end of the main circulation pipe 401 is fixedly installed with the first sealing block 411. One end of the first sealing block 411 is fixedly installed with the threaded pipe orifice 413, and the threaded pipe orifice 413 is communicated with the main circulation pipe 401. The first sealing block 411 is fixedly installed with the sealing ring 412. A plurality of first installation grooves 414 are arranged in an array on one side of the smoke inlet box 1. The size of the first installation groove 414 is adapted to the size of the first sealing block 411 and the first sealing block 411 is inserted into the first installation groove 414. Second screw sleeves 415 are fixedly installed on the outer sides of the corners of the first installation groove 414. Second screw rods 416 are movably inserted at the corners of the sealing ring 412, and the second screw rods 416 are threadedly installed in the second screw sleeves 415. A reductant pump 417 is fixedly installed on the smoke inlet box 1. Flow splitters 418 are fixedly installed in an array on the water outlet pipe of the reductant pump 417. A threaded sleeve 419 is rotatably installed on the flow splitter 418, and the threaded sleeve 419 is threadedly installed on the threaded pipe orifice 413. Second limiting rings 420 are fixedly installed in an array on the inner side of the smoke inlet box 1. One end of the main circulation pipe 401 is inserted into the second limiting rings 420. The schematic diagram of this structure is Figure 4 and Figure 6 , the height of the first sealing block 411 is greater than the sum of the heights of the main circulation pipe 401, the rotating ring 404, the rotating ring 405 and the mixing fan 407, so that the main circulation pipe 401 can be taken out smoothly. A sealing rubber ring is arranged between the flow splitter 418 and the threaded sleeve 419 to ensure its sealing performance. And the separable main circulation pipe 401 enables the main circulation pipe 401 to be conveniently replaced when damaged, and the remaining parts can be disassembled and reused, further reducing the use cost of the equipment; Further, the static mixing mechanism 5 includes a first mounting plate 501, mounting circular grooves 502, a second mounting plate 503 and static mixing fasteners 504. Mounting circular grooves 502 are arranged in an array on the first mounting plate 501, and the positions of the mounting circular grooves 502 are opposite to those of the injection nozzles 402. A second mounting plate 503 is arranged on the upper side of the first mounting plate 501. Static mixing fasteners 504 are fixedly installed in an array on the lower side of the second mounting plate 503, and the static mixing fasteners 504 are all inserted into the mounting circular grooves 502. The schematic diagram of this structure is Figure 6 , this structure enables the mixed upward airflow formed by the injection mechanism 4 to be captured by the mounting circular grooves 502 for static mixing, so as to realize the split mixing of the mixed gas. This not only helps to improve the mixing degree of the flue gas and the reductant, but also can weaken the flow rate of the mixed gas, so that the mixed gas can pass through the catalyst mounting plate 8 more slowly, thereby improving the reaction effect of the flue gas and the reductant and increasing the denitration efficiency of the equipment; Further, the static mixing mechanism 5 includes a connecting plate 505, a fourth screw 506, a second installation groove 507, a fourth screw sleeve 508, and a handle 509. A connecting plate 505 is fixedly installed on one side of the second installation plate 503. Fourth screws 506 are movably inserted at the four corners of the connecting plate 505. A second installation groove 507 is formed on one side of the smoke inlet box 1. Fourth screw sleeves 508 are fixedly installed on the outer sides of the four corners of the second installation groove 507. The fourth screws 506 are installed in the fourth screw sleeves 508 by threads. Two groups of handles 509 are fixedly installed on the connecting plate 505. The height of the second installation groove 507 is greater than the sum of the heights of the second installation plate 503 and the static mixing element 504. The schematic diagram of this structure is Figure 6 , which enables the static mixing element 504 to be disassembled separately. Generally, a static mixing device is usually an integral unit. However, in actual use, due to the large amount of particulate matter in the flue gas, contaminants are likely to adhere to the static mixing elements inside the static mixing device after long-term operation, which may lead to corrosion or blockage. In addition, the static mixing elements are mostly spiral and located inside the device, making the cleaning work difficult. This structure, through the design of the separable static mixing element 504, enables the static mixing element 504 to be disassembled and cleaned more conveniently, effectively solving the problem of difficult cleaning of traditional static mixing devices; Further, the filtering mechanism 6 includes a filter plate 601, a double-sided rack 602, a third installation groove 603, a connecting rotating rod 604, a first gear 605, a second gear 606, a first sealing cover 607, a first motor 608, a dust receiving box 609, and a cleaning brush 610. A filter plate 601 is movably inserted into the transition box 2. Double-sided racks 602 are fixedly installed on both sides of the filter plate 601. Two groups of third installation grooves 603 are formed on the lower side of the transition box 2. Connecting rotating rods 604 are rotatably installed in the third installation grooves 603. First gears 605 are fixedly installed at both ends of the connecting rotating rods 604. The first gears 605 are engaged with the double-sided racks 602. Second gears 606 are fixedly installed at one ends of the two groups of connecting rotating rods 604. The two groups of second gears 606 are rotatably installed outside the transition box 2. The two groups of second gears 606 are engaged with each other. A first sealing cover 607 is fixedly installed outside the transition box 2. The two groups of second gears 606 are located in the first sealing cover 607. A first motor 608 is fixedly installed outside the first sealing cover 607. The output shaft of the first motor 608 is fixedly installed on one of the second gears 606. The lower side of the first sealing cover 607 is not closed. A dust receiving box 609 is arranged on the lower side of the transition box 2. The height of the dust receiving box 609 is adapted to the height of the filter plate 601. Two groups of cleaning brushes 610 are rotatably installed in the dust receiving box 609. The distance between the two groups of cleaning brushes 610 is adapted to the width of the filter plate 601. The schematic diagram of this structure is Figure 7 and Figure 8, this structure enables the filter plate 601 for filtration to descend, and can be cleaned by the cleaning brush 610 during the process of descending into the dust receiving box 609. The bristles of the cleaning brush 610 are elastic and in contact with the surface of the filter plate 601. After cleaning, the filter plate 601 returns to its original position, so that the filter plate 601 can be used for a long time without being blocked, increasing the stability of the equipment operation. A slot adapted to the width of the filter plate 601 is provided on the lower side of the transition box 2, and both the upper and lower sides of the filter plate 601 are wider than this slot, so that the filter plate 601 can seal the slot between the transition box 2 and the dust receiving box 609 during the ascending or descending process; Further, the filtering mechanism 6 includes a fifth installation groove 611, a third gear 612, a fourth gear 613, a second sealing cover 614, a limiting block 615, a fifth screw sleeve 616, a limiting frame 617 and a fifth screw rod 618. A fifth installation groove 611 is provided on one side of the dust receiving box 609. Four groups of third gears 612 are rotatably installed in the fifth installation groove 611. The four groups of third gears 612 are meshed with each other. The third gears 612 on both sides are fixedly connected to the cleaning brush 610. Two groups of fourth gears 613 are rotatably installed on the outside of the dust receiving box 609. The two groups of fourth gears 613 are not meshed with each other and are fixedly connected to the third gears 612 on both sides. A second sealing cover 614 is fixedly installed on the outside of the dust receiving box 609. Both groups of fourth gears 613 are located inside the second sealing cover 614. The upper side of the second sealing cover 614 is not closed. The upper side of the second sealing cover 614 is combined with the lower side of the first sealing cover 607. Both groups of fourth gears 613 are respectively meshed with the two groups of second gears 606. Limiting blocks 615 are fixedly installed at the four corners of the dust receiving box 609. A fifth screw sleeve 616 is fixedly installed inside the limiting blocks 615. Limiting frames 617 are fixedly installed at the four corners of the lower side of the transition box 2. The first sealing cover 607 is inserted on the limiting blocks 615. A fifth screw rod 618 is movably inserted on the limiting frame 617. The fifth screw rod 618 is installed in the fifth screw sleeve 616 through threads. The schematic diagram of this structure is Figure 7 and Figure 8 , this structure enables the cleaning brush 610 to rotate when the filter plate 601 is controlled to descend, and the rotation direction is opposite to the descending direction of the filter plate 601, so that the cleaning brush 610 can clean the surface of the filter plate 601 more efficiently without an additional power source. In addition, this structure also enables the dust receiving box 609 to be completely disassembled, making the cleaning work of the equipment simpler; Further, the flow regulating mechanism 7 includes a connecting main rod 701, an enclosing layer 702, a flow guiding plate 703, a first shunt hole 704, a second shunt hole 705, a fifth gear 706, a transmission rod 707, a sixth gear 708, a third sealing cover 709, and a second motor 710. Two groups of connecting main rods 701 are rotatably installed in the catalytic box 3. The connecting main rods 701 are located above the uppermost catalyst mounting plate 8. Enclosing layers 702 are fixedly installed on the outer sides of the connecting main rods 701. Flow guiding plates 703 are fixedly installed on the connecting main rods 701. The edges of the flow guiding plates 703 do not contact the enclosing layers 702. First shunt holes 704 are arrayed and opened on the enclosing layers 702. Second shunt holes 705 are arrayed and opened on the sides of the connecting main rods 701 and the enclosing layers 702. The width of the enclosing layer 702 is half of the width of the catalytic box 3. Four groups of fifth gears 706 are rotatably installed on the outer side of the catalytic box 3. The two outer fifth gears 706 are fixedly connected to the connecting main rods 701. The two middle fifth gears 706 mesh with each other. Transmission rods 707 are rotatably installed on both the outer fifth gears 706 and the middle fifth gears 706. A sixth gear 708 is rotatably installed on the outer side of the catalytic box 3. The sixth gear 708 meshes with one of the outer fifth gears 706. A third sealing cover 709 is fixedly installed on the outer side of the catalytic box 3. The fifth gear 706 and the sixth gear 708 are both arranged inside the third sealing cover 709. A second motor 710 is fixedly installed on the third sealing cover 709. The output shaft of the second motor 710 is fixedly connected to the sixth gear 708. The schematic diagram of this structure is Figure 9 , Figure 10 and Figure 12 . The flow guiding plate 703 has the function of guiding the mixed air flow, so that the catalyst mounting plate 8 can uniformly receive the air flow under the guidance of the flow guiding plate 703. Compared with the traditional rectifier, this design can make the utilization of the catalyst in the catalyst mounting plate 8 more uniform. In addition, the opened first shunt holes 704 and second shunt holes 705 also have a certain degree of shunt effect, which can further reduce the flow rate of the mixed air flow and extend the contact time between the air flow and the catalyst in the catalyst mounting plate 8; Further, S1: The flue gas enters from the inlet flue gas box 1. The reductant pump 417 pumps in the reductant. The reductant sprays out from the injection inclined holes 406. The mixing fan 407 rotates. The mixing fan 407 mixes the reductant and the flue gas and forms an upward mixed air flow, which enters the installation circular groove 502, and then is statically mixed under the guidance of the static mixing member 504, and then continues to rise and enters the transition box 2. After being filtered by the cleaning brush 610, it is located above the enclosing layer 702 and enters the catalyst mounting plate 8 under the guidance of the flow guiding plate 703 for accelerated denitrification; S2: When the injection mechanism 4 needs to be disassembled, unscrew the corresponding threaded sleeve 419 and the second screw 416, then pull out the first sealing block 411, and unscrew the first screw 410 to separate the rotating ring 404, the rotating ring 405 and the mixing fan 407; S3: When the static mixer 504 needs to be cleaned, unscrew the fourth screw 506 from the fourth screw sleeve 508, then lift the second mounting plate 503 through the handle 509, and then pull out the static mixer 504; S4: When the filter plate 601 needs to be cleaned, start the first motor 608. At this time, the filter plate 601 descends, and the cleaning brush 610 rotates. At this time, the cleaning brush 610 will clean the surface of the filter plate 601. When disassembling the dust receiving box 609, unscrew the fifth screw 618 from the fifth screw sleeve 616, and then separate the limit frame 617 and the limit block 615; S5: When using the flow regulating mechanism 7, start the second motor 710, so that the connecting main rod 701 can drive the surrounding layer 702 and the guide plate 703 to rotate. When the two surrounding layers 702 are completely parallel, the catalytic box 3 can be closed but the mixed gas flow can still pass through at a low rate. The user can determine the flow direction and passing rate of the gas flow by adjusting the angle of the surrounding layer 702.

[0021] Working principle: When the present invention is in use, the flue gas enters from the smoke inlet box 1, the reductant pump 417 pumps in the reductant, the reductant passes through the threaded pipe orifice 413 through the shunt head 418 and enters the circulation main pipe 401, and enters the rotating ring 405 through the rotating ring 404. The reductant is ejected from the injection inclined hole 406. Under the guidance of the injection inclined hole 406, the rotating ring 405 starts to rotate and drives the mixing fan 407 to rotate. The mixing fan 407 mixes the reductant and the flue gas to form an ascending mixed gas flow, which enters the installation round groove 502. Subsequently, it is statically mixed under the guidance of the static mixer 504, continues to rise and enters the transition box 2, is filtered by the cleaning brush 610, and is located above the surrounding layer 702. Under the guidance of the guide plate 703, the mixed gas flow enters the catalyst mounting plate 8 for accelerated denitrification.

[0022] When the injection mechanism 4 needs to be disassembled, unscrew the corresponding threaded sleeve 419 and the second screw 416, pull out the first sealing block 411, so that the circulation main pipe 401 is separated from the second limit ring 420, completely pull out the rotating ring 404, the rotating ring 405 and the mixing fan 407, and finally unscrew the first screw 410 to separate the above components.

[0023] When the static mixer 504 needs to be cleaned, unscrew the fourth screw 506 from the fourth screw sleeve 508, lift the second mounting plate 503 through the handle 509, so that the static mixer 504 is separated from the installation round groove 502, and then pull out the static mixer 504. The installation process is the same.

[0024] When the filter plate 601 needs to be cleaned, start the first motor 608. The output shaft of the first motor drives the second gear 606 to rotate, and then drives the four groups of first gears 605 to rotate. Through meshing with the double-sided rack 602, the filter plate 601 is driven to descend. At the same time, the rotation of the second gear 606 drives the third gear 612 and the cleaning brush 610 to rotate through meshing with the fourth gear 613, and the cleaning brush 610 cleans the surface of the filter plate 601. The restoration process is the same. When disassembling the dust receiving box 609, unscrew the fifth screw 618 from the fifth nut 616 to separate the limit frame 617 from the limit block 615.

[0025]

[0025]

[0026] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature denitration device for flue gas, comprising a smoke inlet box (1), one side of the smoke inlet box (1) is fixedly installed with a transition box (2), and one side of the transition box (2) is fixedly installed with a catalytic box (3), characterized in that: A spraying mechanism (4), the spraying mechanism (4) includes a main circulation pipe (401) and a rotating ring (405), the main circulation pipe (401) is arrayedly installed in the smoke inlet box (1), and the rotating ring (405) is movably installed on the main circulation pipe (401); A static mixing mechanism (5), the static mixing mechanism (5) includes a first mounting plate (501) and static mixing fasteners (504), the first mounting plate (501) is fixedly installed in the smoke inlet box (1), and the static mixing fasteners (504) are arrayedly and movably arranged in the first mounting plate (501); A filtering mechanism (6), the filtering mechanism (6) includes a filter plate (601), a dust receiving box (609) and a cleaning brush (610), the filter plate (601) is movably installed in the transition box (2), a dust receiving box (609) is arranged below the transition box (2), and two groups of cleaning brushes (610) are rotatably installed in the dust receiving box (609); A flow regulating mechanism (7), the flow regulating mechanism (7) includes an enclosing layer (702) and a flow guiding plate (703), the enclosing layer (702) is rotatably installed in the catalytic box (3), and a flow guiding plate (703) is arranged in the enclosing layer (702); Catalyst mounting plates (8) are arrayedly installed in the catalytic box (3).

2. The flue gas low-temperature denitration device according to claim 1, characterized in that: The spraying mechanism (4) includes a main circulation pipe (401), spraying nozzles (402), a first limiting ring (403), a rotating ring (404), a rotating ring (405), spraying inclined holes (406) and mixing fans (407), spraying nozzles (402) are arrayedly arranged on the main circulation pipe (401), first limiting rings (403) are fixedly installed on the spraying nozzles (402), a rotating ring (404) is rotatably installed on the first limiting rings (403), a plurality of balls are rotatably installed in the rotating ring (404) and the balls abut against the upper and lower sides of the first limiting rings (403), a rotating ring (405) is fixedly installed on the rotating ring (404), spraying inclined holes (406) are arrayedly formed in the rotating ring (405), the rotating ring (404) is communicated with the rotating ring (405), and mixing fans (407) are fixedly installed on the rotating ring (405).

3. The flue gas low-temperature denitration device according to claim 2, wherein: The injection mechanism (4) includes a first screw sleeve (408), a clamping block (409), and a first screw rod (410). One set of the rotating rings (404), rotating rings (405), and mixing fans (407) can all be divided into two parts along the center of the circle. A first screw sleeve (408) is fixedly installed inside the left part of one set of the mixing fans (407), and a clamping block (409) is fixedly installed on the right part of the mixing fan (407). The two parts of one set of the mixing fans (407) are staggered and engaged with each other. The clamping block (409) is located directly above the first screw sleeve (408). A first screw rod (410) is movably inserted into the clamping block (409). The first screw rod (410) is threadedly installed in the first screw sleeve (408). The thickness of the center of the blade of the mixing fan (407) is greater than the thickness of the edge.

4. A flue gas low-temperature denitration device according to claim 1, characterized in that: The injection mechanism (4) includes a first sealing block (411), a sealing ring (412), a threaded pipe orifice (413), a first installation groove (414), a second screw sleeve (415), a second screw rod (416), a reductant pump (417), a shunt head (418), a threaded sleeve (419), and a second limiting ring (420). A first sealing block (411) is fixedly installed at one end of the circulation main pipe (401). A threaded pipe orifice (413) is fixedly installed at one end of the first sealing block (411). The threaded pipe orifice (413) is communicated with the circulation main pipe (401). A sealing ring (412) is fixedly installed on the first sealing block (411). A first installation groove (414) is arrayed and opened on one side of the smoke inlet box (1). The size of the first installation groove (414) is adapted to the size of the first sealing block (411), and the first sealing block (411) is inserted into the first installation groove (414). Second screw sleeves (415) are fixedly installed on the outer sides of the corners of the first installation groove (414). Second screw rods (416) are movably inserted into the corners of the sealing ring (412). The second screw rods (416) are threadedly installed in the second screw sleeves (415). A reductant pump (417) is fixedly installed on the smoke inlet box (1). Shunt heads (418) are fixedly installed on the water outlet pipe of the reductant pump (417) in an array. A threaded sleeve (419) is rotatably installed on the shunt head (418). The threaded sleeve (419) is threadedly installed on the threaded pipe orifice (413). Second limiting rings (420) are fixedly installed on the inner side of the smoke inlet box (1) in an array. One end of the circulation main pipe (401) is inserted into the second limiting rings (420).

5. The flue gas low-temperature denitration device according to claim 1, characterized in that: The static mixing mechanism (5) includes a first mounting plate (501), mounting circular grooves (502), a second mounting plate (503), and static mixing fasteners (504). Mounting circular grooves (502) are arrayed on the first mounting plate (501), and the positions of the mounting circular grooves (502) are opposite to those of the injection nozzles (402). A second mounting plate (503) is disposed on the upper side of the first mounting plate (501), and static mixing fasteners (504) are fixedly mounted in an array on the lower side of the second mounting plate (503). The static mixing fasteners (504) are inserted into the mounting circular grooves (502).

6. The flue gas low-temperature denitration device according to claim 5, wherein: The static mixing mechanism (5) includes a connecting plate (505), a fourth screw (506), a second mounting groove (507), a fourth screw sleeve (508), and a handle (509). A connecting plate (505) is fixedly mounted on one side of the second mounting plate (503), and fourth screws (506) are movably inserted at the four corners of the connecting plate (505). A second mounting groove (507) is formed on one side of the smoke inlet box (1), and fourth screw sleeves (508) are fixedly mounted on the outer sides of the four corners of the second mounting groove (507). The fourth screws (506) are threadedly mounted in the fourth screw sleeves (508). Two groups of handles (509) are fixedly mounted on the connecting plate (505), and the height of the second mounting groove (507) is greater than the sum of the heights of the second mounting plate (503) and the static mixing fasteners (504).

7. The flue gas low-temperature denitration device according to claim 1, characterized in that: The filtering mechanism (6) includes a filter plate (601), a double-sided rack (602), a third installation groove (603), a connecting rotating rod (604), a first gear (605), a second gear (606), a first sealing cover (607), a first motor (608), a dust receiving box (609), and a cleaning brush (610). The filter plate (601) is movably inserted into the transition box (2). Double-sided racks (602) are fixedly installed on both sides of the filter plate (601). Two groups of third installation grooves (603) are formed in the lower side of the transition box (2). Connecting rotating rods (604) are rotatably installed in the third installation grooves (603). First gears (605) are fixedly installed at both ends of the connecting rotating rods (604). The first gears (605) are meshed with the double-sided racks (602). Second gears (606) are fixedly installed at one ends of the two groups of connecting rotating rods (604). The two groups of second gears (606) are rotatably installed outside the transition box (2). The two groups of second gears (606) are meshed with each other. The first sealing cover (607) is fixedly installed outside the transition box (2). The two groups of second gears (606) are located in the first sealing cover (607). The first motor (608) is fixedly installed outside the first sealing cover (607). The output shaft of the first motor (608) is fixedly installed on one of the second gears (606). The lower side of the first sealing cover (607) is not closed. The dust receiving box (609) is arranged on the lower side of the transition box (2). The height of the dust receiving box (609) is adapted to the height of the filter plate (601). Two groups of cleaning brushes (610) are rotatably installed in the dust receiving box (609). The distance between the two groups of cleaning brushes (610) is adapted to the width of the filter plate (601).

8. A flue gas low-temperature denitration device according to claim 1, characterized in that: The filtering mechanism (6) includes a fifth mounting groove (611), a third gear (612), a fourth gear (613), a second sealing cover (614), a limiting block (615), a fifth screw sleeve (616), a limiting frame (617) and a fifth screw rod (618). A fifth mounting groove (611) is formed on one side of the dust receiving box (609). Four groups of third gears (612) are rotatably mounted in the fifth mounting groove (611). The four groups of third gears (612) are meshed with each other. The third gears (612) on both sides are fixedly connected to the cleaning brush (610). Two groups of fourth gears (613) are rotatably mounted on the outer side of the dust receiving box (609). The two groups of fourth gears (613) are not meshed with each other and are fixedly connected to the third gears (612) on both sides. A second sealing cover (614) is fixedly mounted on the outer side of the dust receiving box (609). The two groups of fourth gears (613) are both located inside the second sealing cover (614). The upper side of the second sealing cover (614) is not closed. The upper side of the second sealing cover (614) is combined with the lower side of the first sealing cover (607). The two groups of fourth gears (613) are respectively meshed with the two groups of second gears (606). Limiting blocks (615) are fixedly mounted at the four corners of the dust receiving box (609). A fifth screw sleeve (616) is fixedly mounted inside the limiting block (615). Limiting frames (617) are fixedly mounted at the four corners of the lower side of the transition box (2). The first sealing cover (607) is inserted on the limiting block (615). A fifth screw rod (618) is movably inserted on the limiting frame (617). The fifth screw rod (618) is threadedly mounted inside the fifth screw sleeve (616).

9. The flue gas low-temperature denitration device according to claim 1, characterized in that: The flow regulating mechanism (7) includes a connecting main rod (701), an enclosing layer (702), a flow guiding plate (703), a first diversion hole (704), a second diversion hole (705), a fifth gear (706), a transmission rod (707), a sixth gear (708), a third sealing cover (709) and a second motor (710). Two groups of connecting main rods (701) are rotatably installed in the catalytic box (3). The connecting main rods (701) are located above the uppermost catalyst mounting plate (8). Enclosing layers (702) are fixedly installed on the outer sides of the connecting main rods (701). Flow guiding plates (703) are fixedly installed on the connecting main rods (701). The edges of the flow guiding plates (703) do not contact the enclosing layers (702). First diversion holes (704) are arranged in an array on the enclosing layers (702). Second diversion holes (705) are arranged in an array on the sides of the connecting main rods (701) and the enclosing layers (702). The width of the enclosing layer (702) is half of the width of the catalytic box (3). Four groups of fifth gears (706) are rotatably installed on the outer side of the catalytic box (3). The two outer fifth gears (706) are fixedly connected to the connecting main rods (701). The two middle fifth gears (706) are meshed with each other. Transmission rods (707) are rotatably installed on the outer fifth gears (706) and the middle fifth gears (706). A sixth gear (708) is rotatably installed on the outer side of the catalytic box (3). The sixth gear (708) is meshed with one of the outer fifth gears (706). A third sealing cover (709) is fixedly installed on the outer side of the catalytic box (3). The fifth gears (706) and the sixth gear (708) are both arranged in the third sealing cover (709). A second motor (710) is fixedly installed on the third sealing cover (709). The output shaft of the second motor (710) is fixedly connected to the sixth gear (708).

10. A method for using a flue gas low-temperature denitration device, characterized in that The usage method of the flue gas low-temperature denitration device is applicable to a flue gas low-temperature denitration device according to any one of claims 1-9, and includes the following steps; S1: The flue gas enters from the inlet flue gas box (1). The reductant pump (417) pumps in the reductant. The reductant sprays out from the injection inclined holes (406). The mixing fan (407) rotates. The mixing fan (407) mixes the reductant and the flue gas and forms an upward mixed gas flow, which enters the installation round groove (502), and then is statically mixed under the guidance of the static mixing member (504), and then continues to rise and enters the transition box (2). After being filtered by the cleaning brush (610), it is located above the enclosing layer (702), and enters the catalyst mounting plate (8) under the guidance of the flow guiding plate (703) for accelerated denitration; S2: When it is necessary to disassemble the injection mechanism (4), unscrew the corresponding threaded sleeve (419) and the second screw (416), then pull out the first sealing block (411), and unscrew the first screw (410) to separate the rotating ring (404), the rotating ring (405) and the mixing fan (407); S3: When it is necessary to clean the static mixing element (504), unscrew the fourth screw (506) from the fourth screw sleeve (508), then lift the second mounting plate (503) through the handle (509), and then pull out the static mixing element (504); S4: When it is necessary to clean the filter plate (601), start the first motor (608). At this time, the filter plate (601) descends, and the cleaning brush (610) rotates. At this time, the cleaning brush (610) will clean the surface of the filter plate (601). When disassembling the dust receiving box (609), unscrew the fifth screw (618) from the fifth screw sleeve (616), and then separate the limit frame (617) and the limit block (615); S5: When using the flow regulating mechanism (7), start the second motor (710) so that the connecting main rod (701) can drive the surrounding layer (702) and the guide plate (703) to rotate. When the two surrounding layers (702) are completely parallel, the catalytic box (3) can be closed but the mixed air flow can still pass through at a low rate. The user can determine the flow direction and passing rate of the air flow by adjusting the angle of the surrounding layer (702).

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