Medium-low temperature scr flue gas denitration complete device

Abstract

The present application relates to the technical fields of SCR flue gas treatment, and discloses a complete set of medium-low temperature SCR flue gas denitration device, which comprises a reactor, a plurality of rotating shafts are arranged in the reactor in a longitudinal direction and are spaced apart, a sealing frame is arranged on the rotating shafts, a sealing ring is arranged on the outer wall of the sealing frame and is in sliding sealing cooperation with the inner wall of the reactor, sealing grooves are formed in the inner wall of the sealing frame, catalyst plates are detachably arranged in the sealing grooves, and sealing plates are arranged at the ends of the catalyst plates; the present application forms an internal bypass through the self overturning of the rotatable sealing frame, and does not need to stop the whole machine, does not need to additionally add an external bypass flue, a switching valve and a matched pipeline, greatly reduces the consumption of steel structure, reduces the equipment investment, and reduces the land occupation area; when the single-layer catalyst is replaced, the remaining layers can continuously and normally denitrate, the production line does not need to stop production, the loss caused by the reduction of production is avoided, and in the overturning process of the sealing frame, the automatic cleaning and automatic sealing treatment of the grid can be realized, and the catalyst plates are sealed and isolated.

Description

Technical Field

[0001] This invention relates to the field of SCR flue gas treatment technology, specifically a medium-low temperature SCR flue gas denitrification complete set of equipment. Background Technology

[0002] With increasingly stringent ultra-low emission control standards in non-power industries, medium and low temperature SCR denitrification devices are widely used in sintering, glass kilns, waste incineration, industrial boilers and other operating conditions. These devices are located at the rear end of dust removal equipment, and the flue gas temperature is usually 150-300℃. There is no need to add flue gas heating equipment, resulting in lower modification costs and stronger adaptability.

[0003] Traditional SCR denitrification units typically employ fixed reactors with horizontal or vertical flue gas flow. The catalysts utilize conventional structures such as honeycomb or plate types, assembled into independent catalyst modules and fixedly installed inside the reactor. Flue gas flows longitudinally through each catalyst module, where, under the action of the catalyst's active sites, ammonia and nitrogen oxides undergo selective catalytic reduction reactions, thereby achieving flue gas denitrification and purification.

[0004] Catalysts are consumable materials that are easily damaged. After long-term operation, problems such as activity decay, micropore blockage, and ammonium bisulfate crystal poisoning may occur, requiring regular inspection and replacement.

[0005] There are two main ways to replace existing catalysts. One is to replace them by shutting down the machine. Conventional fixed or pull-out catalyst frames cannot isolate a single layer of flue gas. During the replacement operation, flue gas short circuits and excessive emissions are likely to occur, requiring a complete shutdown. This not only affects the continuity of production and causes economic losses, but the frequent start-ups and shutdowns of the equipment will also further aggravate the blockage of ammonium salt crystals. The other is to install an external bypass flue to achieve maintenance without shutting down the machine. However, the additional bypass flue and switching valves will increase the cost of equipment consumables and construction, and occupy a lot of site space.

[0006] To address these issues, those skilled in the art have proposed a low-temperature SCR flue gas denitrification system to solve the problems mentioned in the background. Summary of the Invention

[0007] The purpose of this invention is to provide a complete set of medium- and low-temperature SCR flue gas denitrification equipment to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A medium-low temperature SCR flue gas denitrification complete set of equipment includes a reactor, with an air inlet and an air outlet respectively provided at the top and bottom of the reactor. Multiple rotating shafts are rotatably assembled longitudinally inside the reactor. A sealing frame is installed on the rotating shaft. A sealing ring is installed on the outer wall of the sealing frame and slides and seals with the inner wall of the reactor. An opening is opened in the middle of the sealing ring. Sealing grooves are opened on both sides of the inner wall of the sealing frame. A catalyst plate is detachably assembled in the sealing groove. A sealing plate is installed at the end of the catalyst plate. A sealing port connected to the sealing groove is opened on the side of the sealing frame away from the rotating shaft. The sealing plate and the sealing port are sealed and adapted. The equipment also includes a grid and a sealing assembly.

[0010] Two grids are symmetrically arranged inside the sealing frame. The two grids are located on both sides of the catalyst plate, and the grids are evenly opened with a number of grid holes.

[0011] The sealing component is set inside the sealing frame. The sealing component includes a sealing part, an elastic part and a touching part. When the catalyst plate is replaced, the sealing component will clean the dust particles on the surface of the grille and complete the sealing of the grille holes, providing a closed space for replacing the catalyst plate.

[0012] When replacing the catalyst plate, the rotating shaft drives the sealing frame to rotate 90 degrees, changing the sealing frame and the internal catalyst plate from a horizontal working posture to a vertical posture parallel to the flue gas flow direction. The flue gas flows through the gap between the sealing frame and the inner wall of the reactor to the lower catalyst layer for continuous denitrification. During the flipping process of the sealing frame, the trigger part is released from restraint, and the elastic part releases its elastic force to drive the sealing part to slide, simultaneously scraping off dust and ammonium bisulfate clumps on the grid surface and sealing the grid holes, thus isolating the chamber where the catalyst plate is located from the main flue gas channel. The sealing ring on the outer periphery of the sealing frame slides and fits against the inner wall of the reactor throughout the process to maintain dynamic sealing and prevent short-circuiting of flue gas. After flipping, the sealing frame is aligned with the replacement port on the side wall of the reactor, and the catalyst plate can be directly disassembled and replaced online.

[0013] As a preferred embodiment of the present invention, the size of the opening is larger than the size of the sealing opening on the side of the sealing frame.

[0014] As a preferred embodiment of the present invention, it further includes a replacement port and a sealing frame. The replacement port is detachably sealed to the sealing frame, and the replacement port is located on the side wall of the reactor and corresponds to each sealing frame.

[0015] As a preferred embodiment of the present invention, it further includes a first limiting block and a second limiting block. The first limiting block is disposed on both sides of the reactor wall in the lateral direction for limiting the sealing frame in the lateral direction, and the second limiting block is disposed on both sides of the reactor wall in the longitudinal direction for limiting the sealing frame in the longitudinal direction after it is flipped.

[0016] As a preferred embodiment of the present invention, the sealing part includes a sliding frame that slides in conjunction with the inner wall of the sealing frame, and a plurality of cleaning plates that are spaced apart and correspond to the grid holes are installed in the sliding frame, the cleaning plates being inclined on both sides.

[0017] As a preferred embodiment of the present invention, the elastic part includes a first sliding groove formed at one end of the sealing frame, a first sliding frame slidably disposed in the first sliding groove, the first sliding frame being fixedly connected to the end of the sliding frame, and the first sliding frame being fixedly connected to the inner wall of the first sliding groove by a plurality of springs.

[0018] As a preferred embodiment of the present invention, the triggering part includes a second sliding groove opened at the other end of the sealing frame, a second sliding frame slidably disposed in the second sliding groove, the second sliding frame being fixedly connected to the other end of the sliding frame, and an extension frame being installed on the second sliding frame, with a roller rotatably mounted on the extension frame, and a mating groove being opened at the end of the sealing frame to slide with the extension frame.

[0019] As a preferred technical solution of the present invention, it also includes a cleaning component, which includes a through channel opened on both sides of the sliding frame and communicating with the first sliding groove. The inclined surface of the cleaning plate is provided with a dust suction port communicating with the through channel. A filter box and an air pump are installed on the outer wall of the reactor. The air pump is fixedly connected to the filter box through a delivery pipe. The filter box is connected to the first sliding groove through a dust suction pipe.

[0020] As a preferred embodiment of the present invention, the drive assembly includes a drive box installed on the outer wall of the reactor, a worm gear installed at one end of the shaft that passes through the drive box, a worm gear meshing with the worm gear rotatably arranged inside the drive box, and a motor fixedly connected to the worm gear installed on the outer wall of the drive box.

[0021] The present invention has the following advantages:

[0022] This invention introduces the dust-removed flue gas into the reactor through the air inlet, and uses multiple sets of catalyst plates to denitrify the flue gas, thereby reducing NOx in the flue gas to obtain nitrogen and water, which are then discharged from the air outlet.

[0023] After a single catalyst plate reaches the end of its service life and needs replacement, the drive assembly drives the rotating shaft to rotate the sealing frame 90 degrees. During the rotation of the sealing frame, the catalyst plate inside the sealing frame rotates synchronously, so that the rotated sealing frame and catalyst plate no longer vertically intercept the flue gas, allowing the flue gas to flow directly into the next catalyst plate for denitrification. During the rotation of the sealing frame, the sealing part will slide under the cooperation of the elastic part and the contact part, simultaneously scraping off the dust and ammonium bisulfate clumps on the grid surface and sealing the grid holes, thus isolating the chamber where the catalyst plate is located from the main flue gas channel, facilitating the replacement of the catalyst plate. The rotated catalyst plate faces the replacement port on the outer wall of the reactor. Under the sealing effect of the sealing ring, the fixed frame is sealed to the replacement port. By opening the sealing frame, the catalyst plate can be pulled out through the sealing plate for replacement.

[0024] This invention forms an internal bypass by rotating the sealing frame itself, eliminating the need to shut down the entire machine or add external bypass flues, switching valves, and supporting pipelines. This significantly reduces steel structure materials, lowers equipment investment, and reduces the floor space required. Furthermore, when replacing a single-layer catalyst plate, the remaining layers can continue to denitrify normally without stopping the production line, thus avoiding production losses. During the rotation of the sealing frame, the grille can be automatically cleaned and automatically sealed, while the catalyst plate is sealed and isolated. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0026] Figure 2 This is a schematic diagram of the internal structure of the reactor in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0027] Figure 3 This is a schematic diagram of the structure of the first and second limiting blocks in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0028] Figure 4 This is a schematic diagram of the sealing frame in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0029] Figure 5 This is a schematic diagram of the structure of the sealing frame, grid, and catalyst plate in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0030] Figure 6 This is a first-view structural schematic diagram of a closed component in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0031] Figure 7 This is a schematic diagram of the enclosed component in a medium-low temperature SCR flue gas denitrification system from a second perspective.

[0032] Figure 8 This is a schematic diagram of the sealing frame and sealing ring in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0033] Figure 9 This is a schematic diagram of the cleaning component in a medium-low temperature SCR flue gas denitrification system.

[0034] Figure 10 This is a schematic diagram of the drive component in a medium-low temperature SCR flue gas denitrification complete set of equipment.

[0035] In the diagram: 110, reactor; 120, air inlet; 130, air outlet; 210, rotating shaft; 220, sealing frame; 230, sealing groove; 240, catalyst plate; 250, sealing port; 260, sealing plate; 270, sealing ring; 280, opening; 310, replacement port; 320, sealing frame; 410, first limiting block; 420, second limiting block; 510, grid; 520, grid hole; 6, sealing assembly; 610, sealing part; 611, sliding frame; 612, cleaning plate; 6 20. Elastic part; 621. First slide groove; 622. First sliding frame; 623. Spring; 630. Actuating part; 631. Second slide groove; 632. Second sliding frame; 633. Extension frame; 634. Roller; 635. Mating groove; 7. Cleaning assembly; 710. Suction pipe; 720. Filter box; 730. Conveying pipe; 740. Air pump; 750. Through channel; 760. Suction port; 8. Drive assembly; 810. Drive box; 820. Worm gear; 830. Worm; 840. Motor. Detailed Implementation

[0036] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0037] Please see Figures 1-10A medium-low temperature SCR flue gas denitrification complete set of equipment includes a reactor 110. The reactor 110 has an air inlet 120 at its top and an air outlet 130 at its bottom. Multiple rotating shafts 210 are longitudinally spaced and rotatably mounted inside the reactor 110. A sealing frame 220 is installed on each rotating shaft 210. A sealing ring 270 is installed on the outer wall of the sealing frame 220, which slides and seals against the inner wall of the reactor 110. (The sealing ring 270 is made entirely of high-temperature resistant material, suitable for the high-temperature operating conditions inside the denitrification equipment.) It has excellent heat resistance and anti-aging properties. The sealing ring 270 has an opening 280 in the middle. The inner wall of the sealing frame 220 has sealing grooves 230 on both sides. The catalyst plate 240 is detachably installed in the sealing groove 230. The end of the catalyst plate 240 is equipped with a sealing plate 260. The sealing frame 220 has a sealing port 250 connected to the sealing groove 230 on the side away from the rotating shaft 210. The sealing plate 260 is sealed and adapted to the sealing port 250. It also includes: a grid 510 and a sealing component 6.

[0038] Two grids 510 are symmetrically arranged inside the sealing frame 220. The two grids 510 are respectively located on both sides of the catalyst plate 240, and the grids 510 are evenly provided with a number of grid holes 520.

[0039] The sealing component 6 is disposed inside the sealing frame 220. The sealing component 6 includes a sealing part 610, an elastic part 620 and a triggering part 630. When the catalyst plate 240 is replaced, the sealing component 6 will clean the dust particles on the surface of the grille 510 and complete the sealing of the grille holes 520, providing a closed space for replacing the catalyst plate 240.

[0040] When replacing the catalyst plate 240, the rotating shaft 210 drives the sealing frame 220 to rotate 90 degrees. The sealing frame 220 and the internal catalyst plate 240 change from a horizontal working posture to a vertical posture parallel to the flue gas flow direction. The flue gas flows through the gap between the sealing frame 220 and the inner wall of the reactor 110 to the lower catalyst layer for continuous denitrification. During the flipping process of the sealing frame 220, the trigger part 630 is released from constraint, and the elastic part 620 releases elastic force to drive the sealing part 610 to slide, simultaneously scraping off the dust and ammonium bisulfate agglomerates on the surface of the grid 510 and sealing the grid holes 520, thereby isolating the chamber where the catalyst plate 240 is located from the main flue gas channel. The sealing ring 270 on the outer periphery of the sealing frame 220 slides and fits against the inner wall of the reactor 110 throughout the process to maintain dynamic sealing and prevent short-circuiting of flue gas. After flipping, the sealing frame 220 is aligned with the replacement port 310 on the side wall of the reactor 110, and the catalyst plate 240 can be directly disassembled and replaced online.

[0041] Please see Figure 5 and Figure 8 In one embodiment, the size of the opening 280 is larger than the size of the side sealing opening 250 of the sealing frame 220.

[0042] The opening 280 in the middle of the sealing ring 270 is larger than the sealing port 250 on the side of the sealing frame 220. Under normal operation, the opening 280 completely covers the sealing port 250, ensuring the sealing effect of the sealing plate 260 on the sealing port 250. During the 90-degree rotation of the sealing frame 220, the sealing port 250 is always inside the opening 280. The sealing ring 270 will not interfere with the operation of the catalyst plate 240 and can avoid the edge of the sealing port 250 from scratching and damaging the sealing ring 270. The dynamic seal between the sealing frame 220 and the inner wall of the reactor 110 is maintained throughout the rotation process, preventing bypass flue gas from entering the replacement area.

[0043] Please see Figure 1 and Figure 2 In one embodiment, the system further includes a replacement port 310 and a sealing frame 320. The replacement port 310 is detachably sealed to the sealing frame 320, and the replacement port 310 is located on the side wall of the reactor 110 and corresponds to each sealing frame 220.

[0044] Under normal denitrification operation conditions, the sealing frame 320 is locked and sealed to the replacement port 310 to prevent the high-temperature ammonia-containing flue gas inside the reactor 110 from leaking outward, ensuring the closed operation of the entire unit and avoiding safety and environmental hazards caused by ammonia escape and high-temperature flue gas leakage.

[0045] When the single-layer catalyst plate 240 needs to be inspected and replaced, the drive assembly 8 drives the sealing frame 220 to rotate 90 degrees to a vertical position. The sealing port 250 on the side of the sealing frame 220 is directly opposite the replacement port 310 on the side wall of the reactor 110. At the same time, the sealing ring 270 seals the connection between the sealing frame 220 and the replacement port 310, making it convenient to replace the catalyst plate 240.

[0046] After releasing the locking constraints between the sealing frame 320 and the replacement port 310, the sealing frame 320 can be removed. The external operating space is connected to the interior of the sealing frame 220 through the replacement port 310, the opening 280 in the middle of the sealing ring 270, and the sealing port 250 of the sealing frame 220. The operator can directly pull out the sealing plate 260 and the catalyst plate 240 from the side to complete the online replacement of the catalyst plate 240.

[0047] After replacement, reset the sealing plate 260 to seal the sealing port 250, reassemble and lock the sealing frame 320, restore the sealing state of the replacement port 310, and the device can continue to operate continuously.

[0048] The separate replacement port 310 allows for the individual disassembly and assembly of the single-layer catalyst plate 240 without interfering with the other catalyst layers; the detachable sealing structure of the sealing frame 320 is easy to disassemble and assemble, and the sealing is reliable. Together with the outer dynamic sealing ring 270 and the grille 510 sealing component 6, it forms a double-layer flue gas isolation structure, and there is no problem of flue gas short circuit exceeding the standard during the replacement process.

[0049] Please see Figure 3 In one embodiment, the device further includes a first limiting block 410 and a first limiting block 420. The first limiting block 410 is disposed on both sides of the transverse side of the reactor 110 wall to limit the sealing frame 220 laterally, and the first limiting block 420 is disposed on both sides of the longitudinal side of the reactor 110 wall to limit the sealing frame 220 after it has been flipped.

[0050] When the sealing frame 220 rotates to a horizontal position, the end of the sealing frame 220 abuts against the first limiting block 410 to complete the limiting and fixing, restricting the sealing frame 220 from continuing to rotate, and maintaining the stable working state of the catalyst plate 240 arranged laterally.

[0051] After the rotating shaft 210 drives the sealing frame 220 to rotate 90 degrees, the outer wall of the sealing frame 220 is in contact with the first limiting block 420 to achieve limiting and locking, restricting the sealing frame 220 from continuing to rotate, and keeping the sealing frame 220 stably in a vertical bypass posture coaxial with the flue gas flow direction.

[0052] By relying on two sets of limiting blocks to lock the sealing frame 220 in two extreme postures of horizontal operation and vertical replacement, the sealing frame 220 can be accurately positioned so that the flipped sealing port 250 is precisely aligned with the replacement port 310 on the side wall of the reactor 110.

[0053] Please see Figures 4-7 In one embodiment, the sealing part 610 includes a sliding frame 611 that slides with the inner wall of the sealing frame 220. A plurality of cleaning plates 612, which are spaced apart and correspond to the grid holes 520, are installed in the sliding frame 611. The cleaning plates 612 are attached to the surface of the grid 510 and the two sides of the cleaning plates 612 are inclined.

[0054] The cleaning plate 612 has inclined slopes on both the left and right sides. When the sliding frame 611 moves the cleaning plate 612 along the grid 510, the inclined slopes can first loosen the ammonium bisulfate clumps and dust attached to the surface of the grid 510, and scrape off the crystallization on the surface of the grid 510. When it slides to the limit position, the entire cleaning plate 612 completely covers the corresponding grid hole 520, sealing and blocking the grid hole 520, preventing the flue gas from passing through the grid 510 and flowing into the catalyst chamber inside the sealing frame 220, forming an independent isolation space.

[0055] Compared to straight-plate cleaning components, the double-sided inclined structure has less scraping resistance and is less likely to be stuck by hardened ammonium salt clumps, resulting in better scraping and cleaning effects. At the same time, the inclined slope can guide the stripped dust and clumps to the cleaning end of the cleaning component 7, which is convenient for negative pressure suction and collection, and avoids scraped particles falling into the lower catalyst layer and causing secondary blockage.

[0056] Furthermore, the elastic part 620 includes a first sliding groove 621 formed at one end of the sealing frame 220, a first sliding frame 622 is slidably disposed in the first sliding groove 621, the first sliding frame 622 is fixedly connected to the end of the sliding frame 611, and the first sliding frame 622 is fixedly connected to the inner wall of the first sliding groove 621 by a plurality of springs 623.

[0057] In this process, the spring 623 is in a compressed state and continuously applies an elastic force toward the end of the actuating part 630 to the first sliding frame 622. When the sealing frame 220 is in a transverse state, the inner wall of the reactor 110 pushes the actuating part 630 to initially limit the sliding frame 611, so that the first sliding frame 622 squeezes the spring 623. When the actuating part 630 is no longer pushed, the spring 623 releases its elastic force to drive the sliding frame 611 to slide, so that the cleaning plate 612 can clean the grid 510 and seal the grid holes 520.

[0058] Furthermore, the triggering part 630 includes a second sliding groove 631 opened at the other end of the sealing frame 220. A second sliding frame 632 is slidably disposed in the second sliding groove 631. The second sliding frame 632 is fixedly connected to the other end of the sliding frame 611, and an extension frame 633 is installed on the second sliding frame 632. A roller 634 is rotatably installed on the extension frame 633. The end of the sealing frame 220 is provided with a mating groove 635 that slides with the extension frame 633.

[0059] When the sealing frame 220 maintains a horizontal working posture, the roller 634 is in close contact with the inner wall of the reactor 110. The inner wall of the reactor 110 pushes the roller 634 inward, and the extension frame 633 drives the second sliding frame 632 to slide towards the elastic part 620. This causes the overall sliding frame 611 to compress the spring 623 and retract, so that the cleaning plate 612 moves away from the grid hole 520 and the grid 510 remains open.

[0060] During the rotation of the sealing frame 220 around the rotating shaft 210, the roller 634 rolls along the inner wall of the reactor 110 and gradually gets away from the top pressure constraint of the inner wall of the reactor 110. When the external pushing force disappears, the compression spring 623 releases its elastic force, pulling the first sliding frame 622, the sliding frame 611, and the second sliding frame 632 to slide outwards in sync. The extension frame 633 slides outwards along the mating groove 635, and the roller 634 moves outwards in sync with the extension frame 633. During the movement of the sliding frame 611, the cleaning plate 612 completes the cleaning of the surface of the grid 510 and the sealing of the grid holes 520.

[0061] Specifically, during normal denitrification operation, the sealing frame 220 is kept in a horizontally arranged state. The inner wall of the reactor 110 presses inward against the roller 634 of the trigger part 630. The roller 634 drives the second sliding frame 632 to slide inward along the second slide groove 631 through the extension frame 633, and simultaneously pulls the sliding frame 611 to retract towards the elastic part 620. The first sliding frame 622 connected to the end of the sliding frame 611 squeezes multiple springs 623 in the first slide groove 621, so that the springs 623 are in a compressed energy storage state for a long time. At this time, the cleaning plate 612 on the sliding frame 611 avoids the holes of the grid 510. The grids 510 on both sides are completely transparent, and the flue gas can pass smoothly through the grid 510 and flow through the catalyst plate 240 to complete the denitrification reaction. The sealing component 6 remains in a retracted standby state.

[0062] When the single-layer catalyst plate 240 needs to be replaced due to wear, the drive assembly 8 drives the rotating shaft 210 to drive the sealing frame 220 to rotate 90 degrees to a vertical bypass posture. During the rotation, the roller 634 gradually gets away from the top pressure constraint of the inner wall of the reactor 110, the external limiting force disappears, and the previously compressed and stored spring 623 releases its elastic thrust, pushing the first sliding frame 622 to slide smoothly along the first slide groove 621 towards the touch part 630 side, simultaneously driving the sliding frame 611 to move as a whole. The other end of the sliding frame 611 pulls the second sliding frame 632 to slide outward along the second slide groove 631, and the extension frame 633 follows the... The mating groove 635 at the end of the sealing frame 220 extends outward, and the roller 634 moves outward synchronously with the extension frame 633. During the translation of the sliding frame 611, the cleaning plate 612 slides close to the surface of the grille 510, and the dust and ammonium bisulfate clumps attached to the surface of the grille 510 are scraped off by the inclined slopes on both sides. After the sliding frame 611 slides to the maximum stroke limit position, each cleaning plate 612 completely covers and seals the corresponding grille 510 hole, and the channels of the grilles 510 on both sides are completely isolated, completely isolating the chamber where the internal catalyst plate 240 is located from the main flue gas channel, forming an independent and sealed maintenance space.

[0063] After the catalyst plate 240 replacement is completed, the drive assembly 8 reverses and drives the sealing frame 220 to rotate and reset to a horizontal working position. The roller 634 re-contacts the inner wall of the reactor 110 and is pushed inward, which in turn drives the sliding frame 611 to retract in the opposite direction. The first sliding frame 622 compresses the spring 623 again to complete the energy storage reset. The cleaning plate 612 simultaneously moves away from the grid 510 hole, the grid 510 returns to a transparent state, the sealing assembly 6 returns to the initial standby state, and the reactor 110 can resume continuous denitrification operation.

[0064] Please see Figure 4 and Figure 9In one embodiment, a cleaning component 7 is also included. The cleaning component 7 includes a through channel 750 that is opened on both sides of the sliding frame 611 and communicates with the first slide groove 621. The inclined surface of the cleaning plate 612 is provided with a dust suction port 760 that communicates with the through channel 750. A filter box 720 and an air pump 740 are installed on the outer wall of the reactor 110. The air pump 740 is fixedly connected to the filter box 720 through a delivery pipe 730. The filter box 720 is connected to the first slide groove 621 through a dust suction pipe 710.

[0065] Among them, the dust suction pipe 710 is made of high temperature resistant material and can withstand the high temperature mixed flue gas under denitrification conditions. It is not easy to soften, age and break after long-term use, ensuring the stable sealing of the high temperature dust-containing flue gas suction and conveying channel and avoiding high temperature leakage of the pipeline.

[0066] During the process of the sealing frame 220 flipping and the sliding frame 611 sliding to clear blockages, the air pump 740 continuously works to create negative pressure inside the first slide groove 621, the through channel 750 and the suction port 760; the dust and ammonium bisulfate clumps scraped off by the inclined slope of the cleaning plate 612 are sucked in through the suction port 760 under the action of negative pressure, and enter the filter box 720 through the through channel 750, the first slide groove 621 and the suction pipe 710 in sequence.

[0067] The filter box 720 intercepts and separates solid particulate impurities in the mixed flue gas. The clean flue gas is then discharged through the conveying pipe 730 and the air pump 740 and returned to the reactor 110, realizing solid-gas separation and flue gas recycling. At the same time, the negative pressure can promptly suck away scraped debris, preventing particulate matter from falling into the lower catalyst layer and causing secondary blockage. This, combined with the mechanical scraping action, improves the overall unblocking effect of the grille 510.

[0068] Please see Figure 10 In one embodiment, the drive assembly 8 includes a drive box 810 installed on the outer wall of the reactor 110, a worm gear 820 installed at one end of the shaft 210 that passes through the drive box 810, a worm 830 that meshes with the worm gear 820 rotatably disposed inside the drive box 810, and a motor 840 fixedly connected to the worm 830 installed on the outer wall of the drive box 810.

[0069] During operation, the motor 840 rotates forward and backward, driving the worm 830 to rotate synchronously. Relying on the meshing transmission of the worm wheel 820 and worm 830, the rotational motion of the worm 830 is converted into the rotational motion of the worm wheel 820 and the rotating shaft 210, thereby driving the sealing frame 220 to rotate stably. Utilizing the strong self-locking, precise transmission ratio, and smooth operation characteristics of the worm wheel 820 and worm 830 transmission, the sealing frame 220 can be precisely controlled to complete the switching between two extreme postures: 0-degree horizontal operation and 90-degree vertical replacement. At the same time, the transmission mechanism has a reverse self-locking function, preventing the flue gas flow impact from causing the sealing frame 220 to rotate in the opposite direction. This avoids angular deviation, wobbling, and misalignment of the sealing frame 220 during operation, ensuring that the outer sealing ring 270 of the sealing frame 220 always fits against the inner wall of the reactor 110, maintaining a dynamic sealing effect throughout the process. It also ensures that after the sealing frame 220 is rotated into place, the sealing port 250 and the replacement port 310 on the side wall of the reactor 110 are precisely aligned, improving the overall operational stability and maintenance accuracy of the equipment.

[0070] The working principle of this invention is as follows: the flue gas after dust removal is introduced into the reactor 110 through the air inlet 120, and multiple sets of catalyst plates 240 are used to denitrify the flue gas to reduce NOx in the flue gas, obtain nitrogen and water, and discharge it from the air outlet 130.

[0071] When the single-layer catalyst plate 240 reaches the end of its lifespan and needs replacement, the drive assembly 8 is activated. The motor 840 drives the worm gear 830 to rotate. Through the meshing transmission of the worm wheel 820 and the worm gear 830, the drive shaft 210 drives the sealing frame 220 to rotate 90 degrees, changing the sealing frame 220 from a horizontal to a vertical position. During the rotation, the roller 634 gradually releases the pressure constraint from the inner wall of the reactor 110. After the spring 623 loses its squeezing resistance, it releases its elastic potential energy, pushing the first sliding frame 622, the sliding frame 611, and the second sliding frame 632 to slide synchronously. The extension frame 633 slides along the mating groove 635, and the cleaning plate 612 follows. The sliding frame 611 moves laterally, scraping away the dust and ammonium salt clumps adhering to the surface of the grid 510 by relying on the inclined slopes on both sides. Finally, the cleaning plate 612 completely covers and seals the grid holes 520, achieving complete isolation between the catalyst plate 240 area and the main flue gas channel. At the same time, the air pump 740 starts synchronously, creating a negative pressure inside the cleaning component 7. The scraped-off impurities enter the filter box 720 through the dust suction port 760, the through channel 750, the first slide groove 621, and the dust suction pipe 710 to complete solid-gas separation. The filtered clean flue gas flows back to the reactor 110 for recycling, preventing dust from falling and causing secondary blockage of the lower catalyst plate 240.

[0072] After the sealing frame 220 is flipped to the vertical limit position, it is fixed by the first limiting blocks 420 on both sides of the reactor 110 in the longitudinal direction to prevent the sealing frame 220 from shaking or shifting due to the impact of airflow. At this time, the sealing port 250 on the side of the sealing frame 220 is directly facing the replacement port 310 on the side wall of the reactor 110, and the size of the opening 280 in the middle of the sealing ring 270 is larger than the size of the sealing port 250, so it will not block the sealing port 250 and avoid scratching the sealing ring 270. Then the sealing frame 320 is removed, and the staff can directly pull out the sealing plate 260, take out the failed catalyst plate 240 from the replacement port 310 and replace it with a new plate.

[0073] After the catalyst plate 240 is replaced, the control motor 840 reverses, driving the sealing frame 220 to rotate and reset to a horizontal state. The roller 634 is pressed against the inner wall of the reactor 110 again, pushing the sliding frame 611 to retract and reset. The spring 623 is compressed again to store energy, and the grid hole 520 is reopened. The device returns to normal denitrification operation. The entire device does not require the reactor 110 to be shut down, nor does it require the addition of an external bypass flue. The sealing frame 220 itself rotates to form an internal flue gas bypass, and the remaining catalyst plates 240 can work normally, realizing online non-destructive replacement of the catalyst plate 240.

[0074] This invention forms an internal bypass by rotating the sealing frame 220, eliminating the need for machine shutdown and additional external bypass flues, switching valves, and supporting pipelines. This significantly reduces steel structure materials, lowers equipment investment, and reduces floor space. Furthermore, when replacing a single-layer catalyst plate 240, the remaining layers can continue to denitrify normally without stopping the production line, avoiding production losses. During the rotation of the sealing frame 220, the grille 510 can be automatically cleaned and automatically sealed, while the catalyst plate 240 is sealed and isolated.

[0075] The power supply and control of the electrical equipment in this application are all existing technologies and will not be elaborated upon here. The control of each component can be achieved using a PLC controller disclosed in the prior art, and the model and circuit connection of each component are not specifically limited. All electrical equipment involved are existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve improvements to the software and methods.

[0076] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0077] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A medium-low temperature SCR flue gas denitrification system, comprising a reactor, wherein an air inlet and an air outlet are respectively provided at the top and bottom of the reactor, characterized in that: The reactor contains multiple rotating shafts arranged longitudinally at intervals. A sealing frame is mounted on each shaft. A sealing ring is installed on the outer wall of the sealing frame and slides and seals with the inner wall of the reactor. An opening is provided in the middle of the sealing ring. Sealing grooves are provided on both sides of the inner wall of the sealing frame. A catalyst plate is detachably mounted in the sealing groove. A sealing plate is installed at the end of the catalyst plate. A sealing port connected to the sealing groove is provided on the side of the sealing frame away from the rotating shaft. The sealing plate and the sealing port are sealed and adapted to each other. The reactor also includes a grid and a sealing assembly. Two grids are symmetrically arranged inside the sealing frame. The two grids are located on both sides of the catalyst plate, and the grids are evenly opened with a number of grid holes. The sealing component is set inside the sealing frame. The sealing component includes a sealing part, an elastic part and a touching part. When the catalyst plate is replaced, the sealing component will clean the dust particles on the surface of the grille and complete the sealing of the grille holes, providing a closed space for replacing the catalyst plate. When replacing the catalyst plate, the rotating shaft drives the sealing frame to rotate 90 degrees, changing the sealing frame and the internal catalyst plate from a horizontal working posture to a vertical posture parallel to the flue gas flow direction. The flue gas flows through the gap between the sealing frame and the inner wall of the reactor to the lower catalyst layer for continuous denitrification. During the flipping process of the sealing frame, the trigger part is released from restraint, and the elastic part releases its elastic force to drive the sealing part to slide, simultaneously scraping off dust and ammonium bisulfate clumps on the grid surface and sealing the grid holes, thus isolating the chamber where the catalyst plate is located from the main flue gas channel. The sealing ring on the outer periphery of the sealing frame slides and fits against the inner wall of the reactor throughout the process to maintain dynamic sealing and prevent short-circuiting of flue gas. After flipping, the sealing frame is aligned with the replacement port on the side wall of the reactor, and the catalyst plate can be directly disassembled and replaced online.

2. The low-temperature SCR flue gas denitrification system according to claim 1, characterized in that, The size of the opening is larger than the size of the sealing opening on the side of the sealing frame.

3. The low-temperature SCR flue gas denitrification complete set of equipment according to claim 2, characterized in that, It also includes a replacement port and a sealing frame. The replacement port is a removable sealing assembly for the sealing frame, and the replacement port is located on the side wall of the reactor and corresponds to each sealing frame.

4. The low-temperature SCR flue gas denitrification complete set of equipment according to claim 1, characterized in that, It also includes a first limiting block and a second limiting block. The first limiting block is disposed on both sides of the reactor wall in the lateral direction to limit the sealing frame in the lateral direction, and the second limiting block is disposed on both sides of the reactor wall in the longitudinal direction to limit the sealing frame in the longitudinal direction after it is flipped.

5. The low-temperature SCR flue gas denitrification complete set of equipment according to claim 3, characterized in that, The sealing part includes a sliding frame that slides in conjunction with the inner wall of the sealing frame. Several cleaning plates that are spaced apart and correspond to the grid holes are installed in the sliding frame. The two sides of the cleaning plates are inclined.

6. The medium-low temperature SCR flue gas denitrification complete set of equipment according to claim 5, characterized in that, The elastic part includes a first sliding groove formed at one end of the sealing frame, a first sliding frame slidably disposed in the first sliding groove, the first sliding frame being fixedly connected to the end of the sliding frame, and the first sliding frame being fixedly connected to the inner wall of the first sliding groove by a number of springs.

7. The low-temperature SCR flue gas denitrification complete set of equipment according to claim 6, characterized in that, The triggering part includes a second sliding groove at the other end of the sealing frame, a second sliding frame is slidably disposed in the second sliding groove, the second sliding frame is fixedly connected to the other end of the sliding frame, and an extension frame is installed on the second sliding frame. A roller is rotatably installed on the extension frame, and a mating groove is provided at the end of the sealing frame to slide with the extension frame.

8. The low-temperature SCR flue gas denitrification system according to claim 7, characterized in that, It also includes a cleaning component, which includes a through channel opened on both sides of the sliding frame and connected to the first slide groove. The inclined surface of the cleaning plate has a dust suction port connected to the through channel. A filter box and an air pump are installed on the outer wall of the reactor. The air pump is fixedly connected to the filter box through a delivery pipe. The filter box is connected to the first slide groove through a dust suction pipe.

9. The medium-low temperature SCR flue gas denitrification complete set of equipment according to claim 1, characterized in that, The drive assembly includes a drive box installed on the outer wall of the reactor, a worm gear installed at one end of the shaft that passes through the drive box, a worm gear meshing with the worm gear rotatably installed inside the drive box, and a motor fixedly connected to the worm gear installed on the outer wall of the drive box.

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