A device for recovering and treating VOC waste gas in production of color coated plate

Abstract

The application discloses a kind of VOC waste gas recovery treatment devices for color coated sheet production, and relates to VOC waste gas recovery processing technical field.The VOC waste gas recovery treatment device for color coated sheet production, including shell, and zeolite runner assembly installed in shell, zeolite runner assembly is equipped with adsorption zone, desorption zone and cooling zone, further including filter screen tray, set on the waste gas inlet path of zeolite runner assembly, and located in adsorption zone upstream, for filtering the waste gas into adsorption zone.Using the reverse backflush of zeolite runner assembly desorption gas, realize the non-contact cleaning of waste on filter screen tray, and do not need additional ventilation, reduce cost, by multilayer filter screen tray setting and time-sharing rotation control, realize the step-by-step interception and dynamic cleaning of particulate matter in waste gas, effectively avoid the physical abrasion of filter screen by traditional scraper cleaning method, significantly prolong the service life of filtration system.

Description

Technical Field

[0001] This invention relates to the field of VOC waste gas recovery and treatment technology, specifically to a VOC waste gas recovery and treatment device for color-coated steel sheet production. Background Technology

[0002] During the production of color-coated steel sheets, the coating and baking curing processes generate a large amount of waste gas containing volatile organic compounds (VOCs). These waste gases have complex compositions, mainly including solvents such as benzene compounds, esters, ketones, alcohols, and ethers. They are highly concentrated and flammable, and must be effectively treated to meet environmental protection requirements and recover resources or energy.

[0003] Chinese patent CN217449551U discloses a VOC waste gas treatment device based on zeolite rotor adsorption. The device consists of a filtration and separation structure, a zeolite rotor structure, and a heating and exhaust structure from top to bottom. Unlike the existing horizontal structure, the internal structure of this device is reasonably arranged. The filtration and separation structure mainly performs the function of gas exchange, realizing the filtration, input, and output of gas.

[0004] In the process of treating VOC exhaust gas in zeolite rotors, although the traditional scraper cleaning method can effectively remove particulate matter accumulated on the surface of the filter screen, it has two key drawbacks: first, the direct physical contact between the scraper and the filter screen will gradually wear down the filter media and affect its service life; second, frequent maintenance and replacement of scraper components are required, which increases the system operating cost. This mechanical cleaning method has an irreconcilable contradiction between ensuring cleaning effect and avoiding equipment wear and tear, and there is an urgent need to develop more optimized non-contact cleaning technology to solve this industry pain point. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a VOC waste gas recovery and treatment device for color-coated steel sheet production, which solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a VOC waste gas recovery and treatment device for color-coated steel sheet production, comprising a housing and a zeolite rotor assembly installed within the housing. The zeolite rotor assembly is provided with an adsorption zone, a desorption zone, and a cooling zone. It also includes a filter screen, which is disposed on the waste gas inlet path of the zeolite rotor assembly and located upstream of the adsorption zone, for filtering the waste gas entering the adsorption zone. The filter screen rotates around an axis, causing its filtration area to periodically shift to a position corresponding to the desorption zone. The desorption zone reversely conveys desorbed gas to the surface of the filter screen that has shifted to that position for backflushing and removing filter debris.

[0007] Furthermore, the filter screens are arranged in at least two sets and stacked along the airflow direction, and the mesh size of the filter screens decreases step by step along the airflow direction. Each set of filter screens rotates independently, and the filtration area of ​​each set of filter screens is alternately shifted to the area below the desorption zone, so that the high-temperature desorbed gas removes the waste on each set of filter screens in stages.

[0008] Furthermore, it also includes a filter chamber, coaxially arranged on the outer periphery of the filter screen, with its inner wall rotating and sealingly fitted with the outer edge of the filter screen; isolation spokes, radially fixed on the upper and lower sides of the filter screen, so that the surface of the filter screen forms relatively independent filter sectors; a fan-shaped partition, arranged between the upper and lower sets of filter screens, and the central angle corresponding to the fan-shaped partition is greater than the sum of the central angles corresponding to the two adjacent filter sectors; wherein, a through hole is opened in the middle of the fan-shaped partition, the axis of the through hole coincides with the center line of the exhaust gas inlet path, and the isolation spokes and the fan-shaped partition are fitted together to form an airtight sliding pair, so that the exhaust gas inlet path on the filter screen is in a relatively sealed state.

[0009] Furthermore, it also includes a conical separation chamber, coaxially fixed to the lower end of the filter chamber; a chassis, located at the bottom of the filter chamber, the upper surface of the chassis and the bottom fan-shaped partition forming a dynamic sealed chamber, so that the exhaust gas inlet path on the filter screen located therein is in a relatively sealed state; a top cover, located at the upper end of the conical separation chamber and fixedly connected to the chassis; the top cover is provided with a tangential air inlet, the center line of the tangential air inlet is tangential to the inner wall of the conical separation chamber, used to guide the backflushed desorbed gas containing debris into the interior of the conical separation chamber, realizing the cyclone separation of waste debris and desorbed gas, wherein the two ends of the chassis are inclined structures, so that the waste debris at the bottom of the filter chamber slides along the inclined structure to the tangential air inlet.

[0010] Furthermore, the filter chamber is provided with a transmission assembly for driving the filter discs to rotate in the middle. The transmission assembly includes: a bushing, rotatably mounted on the inner axis of the filter chamber; an incomplete gear, fixed on the outside of the bushing and on the same horizontal plane as the corresponding filter disc; an annular internal gear, with a hole at the axis of the filter disc and an annular internal gear fixed on the inner wall of the hole; and a pinion, rotatably mounted between the incomplete gear and the annular internal gear and meshing with the incomplete gear and the annular internal gear. The central angle θ corresponding to the teeth on the incomplete gear is 360° / N, where N is the number of filter disc groups, and the projection of the teeth on the incomplete gear in the plane forms a complete gear structure.

[0011] Furthermore, the zeolite rotor assembly includes a rotor frame rotatably mounted inside the upper part of the housing, with a bottom support at its inner bottom and second isolation plates evenly spaced radially inside; a zeolite wheel core mounted between two adjacent second isolation plates; a fixing frame fixed to the end of the zeolite wheel core away from the bottom support; and a first isolation plate fixed inside the housing below the rotor frame, with a cavity between it and the rotor frame. The first isolation plate has an adsorption zone inlet, and a second sealing cover is mounted on the side of the first isolation plate near the adsorption zone inlet. The second sealing cover has a cooling zone inlet and a desorption zone inlet. The cooling zone has an outlet; a first sealing cover is fixed inside the upper part of the outer shell and corresponds to the position of the second sealing cover, and the first sealing cover is equipped with a cooling return gas pipe adapted to the inlet of the cooling zone and a desorption inlet gas pipe adapted to the outlet of the desorption zone; a heat exchanger is fixed outside the outer shell, the cold source input end of the heat exchanger is connected to the cooling return gas pipe, and the heat source output end of the heat exchanger is connected to the desorption inlet gas pipe; wherein, the area of ​​the zeolite wheel core corresponding to the cooling return gas pipe is the cooling zone, the area of ​​the zeolite wheel core corresponding to the desorption inlet gas pipe is the desorption zone, and the area of ​​the zeolite wheel core between the cooling zone and the desorption zone is the adsorption zone.

[0012] Furthermore, an adsorption gas pipe is installed at the inlet of the adsorption zone, and a cooling pipe communicating with the inlet of the cooling zone is provided on one side of the adsorption gas pipe. A desorption outlet pipe is provided at the outlet of the desorption zone, and a first guide hood with a long strip structure is installed at the lower end of the desorption outlet pipe. The first guide hood is communicating with the filter chamber. An air inlet pipe is fixed at the lower end of the filter chamber directly below the adsorption gas pipe, and a second exhaust pipe rotatably connected to the bushing is provided in the middle of the filter chamber. The lower end of the second exhaust pipe extends to the upper end of the conical separation chamber and is equipped with a second guide hood.

[0013] Furthermore, a motor is fixed to the outside of the outer casing, a reduction gearbox is provided at the output end of the motor, a rotating shaft is provided at the output end of the reduction gearbox, a driving wheel is installed at one end of the rotating shaft, a driven wheel is fixedly sleeved on the outside of the rotating wheel frame, a synchronous transmission belt is provided between the driven wheel and the driving wheel, and a slot corresponding to the synchronous transmission belt is provided on the outside of the outer casing; a transmission gearbox is installed at the lower end of the reduction gearbox, the other end of the rotating shaft extends into the transmission gearbox and is equipped with a fourth bevel gear, a transmission shaft is rotatably connected radially inside the outer casing, one end of the transmission shaft extends into the transmission gearbox and is equipped with a third bevel gear meshing with the fourth bevel gear, a second bevel gear is fixedly sleeved on the other end of the transmission shaft, and a first bevel gear meshing with the second bevel gear is installed at the upper end of the bushing penetrating the filter chamber.

[0014] Furthermore, a base is installed at the bottom of the outer shell, and a slag discharge pipe is provided inside the base. The slag discharge pipe is used to output waste debris from the bottom of the conical separation chamber.

[0015] Furthermore, a brush is installed inside the filter chamber, located below the filter screen and near the tangential air inlet, for scraping off debris from the lower surface of the filter screen.

[0016] The present invention has the following beneficial effects:

[0017] (1) The VOC waste gas recovery and treatment device for the production of color coated steel plates utilizes the reverse backflow of the desorbed gas from the zeolite rotor assembly to achieve non-contact cleaning of waste debris on the filter screen without the need for additional air supply, thus reducing costs. Through the multi-layer filter screen setup and time-sharing rotation control, the device achieves step-by-step interception and dynamic cleaning of particulate matter in the waste gas, effectively avoiding physical wear of the filter screen caused by the traditional scraper cleaning method and significantly extending the service life of the filtration system.

[0018] (2) The VOC waste gas recovery and treatment device for the production of color-coated steel sheets ensures strict isolation between adsorbed waste gas and backflushing desorbed gas through the dynamic sealing structure formed by the isolation spokes and the fan-shaped partition, avoids mutual interference of airflow, maintains the stability of the system flow field, and improves the VOC adsorption efficiency.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the filter chamber in this invention;

[0023] Figure 4 This is a schematic diagram of the filter screen drive structure in this invention;

[0024] Figure 5 This is a schematic diagram of the installation structure of the filter screen in this invention;

[0025] Figure 6 In this invention Figure 5 Top view;

[0026] Figure 7 This is a schematic diagram of the fan-shaped partition installation structure in this invention;

[0027] Figure 8 In this invention Figure 7 Another perspective view;

[0028] Figure 9 This is a schematic diagram of the internal structure of the cyclone separator and filter chamber in this invention;

[0029] Figure 10This is a schematic diagram of the zeolite rotor assembly structure in this invention;

[0030] Figure 11 In this invention Figure 10 Another perspective view;

[0031] Figure 12 In this invention Figure 10 Exploded view;

[0032] Figure 13 In this invention Figure 12 Another perspective view.

[0033] In the diagram, 1. Base; 2. Outer shell; 3. Heat exchanger; 4. First exhaust pipe; 5. Second exhaust pipe; 6. Inlet pipe; 7. Slag discharge pipe; 8. Motor; 9. Reduction gearbox; 10. Transmission gearbox; 11. Shaft; 12. Drive wheel; 13. Synchronous transmission belt; 14. Rotary wheel frame; 15. Driven wheel; 16. Transmission shaft; 17. Filter chamber; 18. Conical separation chamber; 19. Cooling pipe; 20. Desorption exhaust pipe; 21. First guide shroud; 22. Bushing; 23. First bevel gear; 24. Second bevel gear; 25. Third bevel gear; 26. Fourth bevel gear; 27. Through Filter disc; 28. Isolation spokes; 29. ​​Annular internal gear; 30. Incomplete gear; 31. Pinion; 32. Adsorption pipe; 33. Fan-shaped baffle; 34. Through hole; 35. Brush; 36. Top cover; 37. Second guide shroud; 38. Tangential air inlet; 39. Chassis; 40. Cooling return pipe; 41. Desorption inlet pipe; 42. First sealing cover; 43. Fixing frame; 44. Zeolite wheel core; 45. First isolation plate; 46. Second sealing cover; 47. Desorption zone outlet; 48. Cooling zone inlet; 49. Adsorption zone inlet; 50. Second isolation plate; 51. Bottom support. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0036] The following is based on Figure 1 - Figure 13 This invention describes a VOC waste gas recovery and treatment device for color-coated steel sheet production provided in an embodiment of the invention.

[0037] Please see Figure 1 - Figure 13 The present invention provides a technical solution: a VOC waste gas recovery and treatment device for color-coated steel sheet production, including a shell 2 and a zeolite rotor assembly installed in the shell 2. The zeolite rotor assembly is provided with an adsorption zone, a desorption zone and a cooling zone. It also includes a filter screen 27, which is set on the waste gas inlet path of the zeolite rotor assembly and located upstream of the adsorption zone. The surface of the filter screen 27 is perpendicular to the airflow direction and is used to filter the waste gas entering the adsorption zone.

[0038] Specifically, the filter disc 27 rotates around the axis, causing its filtration area to periodically shift to the position corresponding to the desorption zone. This is the cleaning action zone, which can be defined as the backwash station. The desorption zone reversely conveys desorption gas to the surface of the filter disc 27 that has shifted to this position for backwashing to remove filter debris.

[0039] like Figure 3 - Figure 9 As shown, to improve the filtration effect of the exhaust gas entering the adsorption zone, this embodiment provides at least two sets of filter discs 27, which are stacked along the airflow direction. The mesh size of the filter discs 27 decreases step by step along the exhaust gas inlet path, thereby improving the filtration effect of the exhaust gas and reducing the blockage of the zeolite rotor assembly caused by waste debris in the exhaust gas. Each set of filter discs 27 rotates independently, and the filtration area of ​​each set of filter discs 27 is alternately displaced to the backflushing station, so that the high-temperature desorbed gas removes the waste debris on each set of filter discs 27 in stages. That is, when one layer of filter discs 27 performs the rotation action, the other layers of filter discs 27 maintain a static positioning state. This time-sharing control method effectively blocks the hot airflow disturbance caused by the rotation process of the upper layer filter discs 27, avoids the heat transfer interference of the high-temperature desorbed gas to the adjacent lower layer filter discs 27 and the destruction of the uniformity of airflow distribution, and is conducive to the backflushing of waste debris on the lower layer filter discs 27.

[0040] It should be noted that during the backwashing process, waste particles fall from the upper filter disc 27 to the lower filter disc 27. Since the lower filter disc 27 has a larger aperture, it is easier for the waste particles to fall off layer by layer. During this process, by having a single filter disc 27 rotate while the other filter discs 27 remain stationary, the high-temperature desorbed gas can be better backwashed onto the rotating filter disc 27, thereby cleaning the filter disc 27.

[0041] like Figure 3 - Figure 9As shown, to avoid the risk of flow field interference between the adsorbed waste gas and the backflushing desorbed gas when the filter screen 27 rotates, the VOC waste gas recovery and treatment device for color-coated steel sheet production provided in this embodiment also includes a filter chamber 17, isolation spokes 28, and a fan-shaped partition 33. The filter chamber 17 is coaxially arranged on the outer periphery of the filter screen 27, and its inner wall is rotatably sealed with the outer edge of the filter screen 27. Preferably, the outer edge of the filter screen 27 is provided with a first sealing ring, which is rotatably connected to the filter chamber 17. The isolation spokes 28 are radially fixed on the upper and lower sides of the filter screen 27, so that the surface of the filter screen 27 forms relatively independent filter sectors. The fan-shaped partition 33 is arranged between the two sets of filter screens 27 in the upper and lower positions, and the fan-shaped partition 33... The corresponding central angle is greater than the sum of the central angles of the two adjacent filter sectors. The sector-shaped baffle 33 has a through hole 34 in the middle. The maximum diameter of the projection of the through hole 34 on the filter screen 27 is smaller than the minimum radial span of the corresponding filter sector. This is to ensure that the isolation spokes 28 continuously cover the edge area of ​​the through hole 34 during the rotation of the filter screen 27. Through the dynamic sealing interface formed with the sector-shaped baffle 33, the adsorbed waste gas and the backflushing desorbed gas are separated. The axis of the through hole 34 coincides with the center line of the waste gas inlet path. The isolation spokes 28 and the sector-shaped baffle 33 are fitted together to form an airtight sliding pair, forming an effective airflow barrier, so that the waste gas inlet path on the filter screen 27 is in a relatively sealed state.

[0042] like Figure 2 - Figure 9 As shown, in order to clean the waste debris inside the backflushing desorbed gas, the VOC waste gas recovery and treatment device for color-coated steel sheet production provided in this embodiment also includes a conical separation chamber 18, which is coaxially fixed to the lower end of the filter chamber 17. Preferably, the conical separation chamber 18 and the filter chamber 17 are fixedly connected by a flange. A chassis 39 is fixed at the bottom inside the filter chamber 17. The upper surface of the chassis 39, the bottom fan-shaped partition 33, and the corresponding isolation spokes 28 form a dynamic sealed chamber, so that the waste gas inlet path on the filter screen 27 located therein is in a relatively sealed state. In this state, the chassis 39 and the fan-shaped partition 33 have the same function.

[0043] To achieve the cleaning of waste debris on the filter screen 27 after backflushing, a top cover 36 is provided at the upper end of the conical separation chamber 18. The top cover 36 is fixedly connected to the chassis 39. A tangential air inlet 38 is provided on the top cover 36. The center line of the tangential air inlet 38 is tangential to the inner wall of the conical separation chamber 18. It is used to guide the desorbed gas containing debris after backflushing into the interior of the conical separation chamber 18 to achieve cyclone separation of waste debris and desorbed gas. The specific structure of the conical separation chamber 18 is existing technology and will not be described in detail here. The chassis 39 has inclined structures at both ends, which can allow the waste debris at the bottom of the filter chamber 17 to slide along the inclined structure to the tangential air inlet 38, so that the backflushing desorbed gas and waste debris can be separated by cyclone separation through the conical separation chamber 18.

[0044] like Figure 4 - Figure 6 As shown, in order to drive the filter screen 27, a transmission assembly for driving the filter screen 27 to rotate is provided in the middle of the filter chamber 17. The transmission assembly includes a bushing 22 and an incomplete gear 30. The bushing 22 is rotatably mounted on the inner axis of the filter chamber 17, and the incomplete gear 30 is fixed on the outside of the bushing 22 and is on the same horizontal plane as the corresponding filter screen 27.

[0045] The transmission assembly also includes an internal ring gear 29 and a pinion 31. A hole is provided at the center of the filter disc 27, and a second sealing ring is provided on the inner wall of the hole. The internal ring gear 29 is fixed inside the second sealing ring. The pinion 31 is rotatably mounted between the incomplete gear 30 and the internal ring gear 29, and meshes with both the incomplete gear 30 and the internal ring gear 29. It should be noted that in this embodiment, the fan-shaped partition 33 is preferably composed of two semi-circular plates. One semi-circular plate has the same radius as the inner wall radius of the filter chamber 17, and the other semi-circular plate has the same radius as the hole radius. This achieves both sealing of the hole to prevent gas leakage and support for the pinion 31, ensuring that the components driving the filter disc 27 are in a relatively sealed environment. In this configuration, the central angle θ corresponding to the teeth on the incomplete gear 30 is 360° / N, where N is the number of filter disks 27. The projections of the teeth on the incomplete gear 30 onto the plane form a complete gear structure. For example, when there are three sets of filter disks 27 and three sets of incomplete gears 30, and the central angle corresponding to the teeth on the incomplete gear 30 is 120°, the projections of the teeth on the three sets of incomplete gears 30 onto the horizontal plane will not overlap, and they will form a complete gear structure. This configuration can effectively achieve individual intermittent driving of each set of filter disks 27 and ensure that when one layer of filter disks 27 performs a rotational action, the other layers of filter disks 27 maintain a static positioning state.

[0046] like Figure 2 , Figure 10 , Figure 11 , Figure 12 and Figure 13As shown, the zeolite rotor assembly provided in this embodiment includes a rotor frame 14, which is rotatably mounted inside the upper part of the housing 2. A bottom support 51 is provided at the bottom of the rotor frame 14, and second isolation plates 50 are installed radially at equal intervals inside the rotor frame 14. A zeolite wheel core 44 is installed between two adjacent second isolation plates 50. A fixing frame 43 is fixed at the end of the zeolite wheel core 44 away from the bottom support 51. A first isolation plate 45 is fixed inside the housing 2 below the rotor frame 14. A cavity is provided between the first isolation plate 45 and the rotor frame 14. An adsorption zone inlet 49 is provided on the first isolation plate 45, and a second sealing cover 46 is installed on the side of the first isolation plate 45 located at the adsorption zone inlet 49. A cooling zone inlet 48 is provided on the second sealing cover 46. The first sealing cover 42 is installed at the upper part of the outer shell 2, corresponding to the position of the second sealing cover 46, and a cooling return gas pipe 40 adapted to the cooling zone inlet 48 and a desorption gas inlet pipe 41 adapted to the desorption zone outlet 47 are installed on the first sealing cover 42. A heat exchanger 3 is installed on the outside of the outer shell 2, and a heater is provided inside the heat exchanger 3. The cold source input end of the heat exchanger 3 is connected to the cooling return gas pipe 40, and the heat source output end of the heat exchanger 3 is connected to the desorption gas inlet pipe 41. The area of ​​the zeolite wheel core 44 corresponding to the cooling return gas pipe 40 is the cooling zone, the area of ​​the zeolite wheel core 44 corresponding to the desorption gas inlet pipe 41 is the desorption zone, and the area of ​​the zeolite wheel core 44 between the cooling zone and the desorption zone is the adsorption zone.

[0047] After the exhaust gas passes through the filter screen 27, it enters the adsorption zone, where it adsorbs the organic waste gas. The purified air is then discharged from the first exhaust pipe 4 at the upper end of the outer shell 2. At this time, the rotating wheel frame 14 rotates, causing the zeolite wheel core 44 to rotate and enter the desorption zone. By inputting high-temperature desorption gas into the desorption zone, the organic gas adsorbed in the zeolite wheel core 44 is desorbed. The rotating wheel frame 14 further rotates, causing the zeolite wheel core 44 to rotate and enter the cooling zone. By inputting cooling gas into the zeolite wheel core 44, the zeolite wheel core 44 is regenerated, thereby achieving continuous treatment of VOC exhaust gas.

[0048] It should be noted that a zeolite rotor is a device for adsorbing volatile organic compounds (VOCs) from waste gas. Its zeolite core is usually disc-shaped and divided into an adsorption zone, a desorption zone, and a cooling zone. The zeolite rotor rotates at a certain speed and operates continuously in each of the above zones. Waste gas enters the zeolite core through the waste gas inlet. Then, the adsorbent in the adsorption zone of the zeolite rotor adsorbs and removes the VOCs from the waste gas. The purified waste gas is discharged from the treatment zone of the zeolite rotor. The VOCs adsorbed in the zeolite rotor are desorbed and concentrated to 5-30 times their original concentration in the desorption zone after being treated by preheated gas, and are then discharged with the preheated gas to the subsequent combustion device for further treatment.

[0049] like Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 11 As shown, an adsorption gas pipe 32 is installed on the inlet 49 of the adsorption zone to input the filtered waste gas into the adsorption zone. A cooling pipe 19 connected to the inlet 48 of the cooling zone is provided on one side of the adsorption gas pipe 32 to divert the waste gas during input, so that the low-temperature waste gas can cool the zeolite wheel core 44 of the cooling zone. A desorption gas outlet 47 is provided with a desorption gas outlet pipe 20. A long strip-shaped first guide hood 21 is installed at the lower end of the desorption gas outlet pipe 20. The first guide hood 21 is connected to the filter chamber 17 to input the high-temperature desorbed gas into the filter chamber 17. Through the setting of the first guide hood 21, the high-temperature desorbed gas forms an airflow field distributed radially along the filter screen 27, which is conducive to the overall cleaning of the filter screen 27.

[0050] In addition, an air inlet pipe 6 is fixed at the lower end of the filter chamber 17, directly below the adsorption pipe 32, for inputting waste gas into the filter chamber 17. A second exhaust pipe 5 is provided in the middle of the filter chamber 17 and is rotatably connected to the bushing 22. The lower end of the second exhaust pipe 5 extends to the upper end of the conical separation chamber 18 and is equipped with a second guide hood 37. The arrangement of the second guide hood 37 and the second exhaust pipe 5 is conducive to collecting the high-concentration desorbed gas after separation by the conical separation chamber 18.

[0051] like Figure 1 - Figure 3 As shown, to drive the wheel frame 14, a motor 8 is fixed on the outside of the housing 2. A reduction gearbox 9 is provided at the output end of the motor 8, and a rotating shaft 11 is provided at the output end of the reduction gearbox 9. A drive wheel 12 is installed at one end of the rotating shaft 11. A driven wheel 15 is fixedly sleeved on the outside of the wheel frame 14. A synchronous transmission belt 13 is provided between the driven wheel 15 and the drive wheel 12. The outside of the housing 2 is provided with a slot corresponding to the synchronous transmission belt 13. The reduction gearbox 9 reduces the output speed of the motor 8 and transmits the power to the rotating shaft 11. The rotating shaft 11 causes the drive wheel 12 to rotate. Through the transmission action between the drive wheel 12, the synchronous transmission belt 13 and the driven wheel 15, the driven wheel 15 drives the wheel frame 14 to rotate.

[0052] To drive the bushing 22, a transmission gearbox 10 is installed at the lower end of the reduction gearbox 9. The other end of the rotating shaft 11 extends into the transmission gearbox 10 and is fitted with a fourth bevel gear 26. A transmission shaft 16 is rotatably connected radially inside the housing 2. One end of the transmission shaft 16 extends into the transmission gearbox 10 and is fitted with a third bevel gear 25 that meshes with the fourth bevel gear 26. The other end of the transmission shaft 16 is fixedly fitted with a second bevel gear 24. The upper end of the bushing 22 passes through the filter chamber 17 and is fitted with a first bevel gear 23 that meshes with the second bevel gear 24. The fourth bevel gear 26 is rotated by the rotating shaft 11. The engagement of the fourth bevel gear 26 with the third bevel gear 25 causes the transmission shaft 16 to rotate, which in turn drives the second bevel gear 24 to rotate. The engagement of the second bevel gear 24 with the first bevel gear 23 causes the bushing 22 to rotate.

[0053] like Figure 1 and Figure 2 As shown, in order to achieve the output of waste chips separated by the conical separation chamber 18, a base 1 is installed at the bottom of the outer shell 2. A slag discharge pipe 7 is provided inside the base 1. The slag discharge pipe 7 is used to output the waste chips at the bottom of the conical separation chamber 18. Preferably, one end of the slag discharge pipe 7 passes through the base 1 and is equipped with a discharge valve. A screw conveyor is installed inside the slag discharge pipe 7. After the waste chips are separated by the conical separation chamber 18, they can be discharged out of the equipment by the screw conveyor.

[0054] like Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, in order to improve the removal effect of waste debris on the filter screen 27, a brush 35 is installed inside the filter chamber 17. The brush 35 is located below the filter screen 27 and close to the tangential air inlet 38. It is used to scrape off the waste debris on the lower surface of the filter screen 27. As the filter screen 27 rotates, the filter screen 27 and the brush 35 interact, further causing the waste debris on the filter screen 27 to fall to the tangential air inlet 38, which is conducive to the removal of waste debris.

[0055] During use (operation), exhaust gas is input into the filter chamber 17 through the air inlet pipe 6, and the motor 8 is started. The motor 8 and the reduction gearbox 9 transmit power to the rotating shaft 11, which in turn causes the drive wheel 12 to rotate. Through the transmission between the drive wheel 12, the synchronous transmission belt 13 and the driven wheel 15, the driven wheel 15 drives the rotating frame 14 to rotate. The rotating shaft 11 causes the fourth bevel gear 26 to rotate. The fourth bevel gear 26 meshes with the third bevel gear 25, causing the transmission shaft 16 to rotate, which in turn drives the second bevel gear 24 to rotate. The second bevel gear 24 meshes with the first bevel gear 23, causing the bushing 22 to rotate.

[0056] The exhaust gas passes through multiple sets of filter discs 27 inside the filter chamber 17 to separate waste particles. The filtered exhaust gas is then input into the zeolite rotor assembly via the adsorption pipe 32. The zeolite wheel core 44 inside the adsorption zone adsorbs the organic waste gas in the exhaust gas, and the purified air is discharged from the first exhaust pipe 4 at the upper end of the outer shell 2. At this time, the rotor frame 14 rotates, driving the zeolite wheel core 44 to rotate, so that the zeolite wheel core 44 enters the desorption zone. By inputting high-temperature desorption gas into the desorption zone, the organic gas adsorbed in the zeolite wheel core 44 is desorbed. The rotor frame 14 rotates further, driving the zeolite wheel core 44 to rotate, so that the zeolite wheel core 44 enters the cooling zone. The low-temperature exhaust gas input through the cooling pipe 19 can cool the zeolite wheel core 44 in the cooling zone, so that the zeolite wheel core 44 is regenerated, thereby realizing the continuous treatment of VOC exhaust gas.

[0057] Driven by the bushing 22, the incomplete gear 30 rotates, which in turn causes the pinion 31 to drive the annular inner gear 29 to rotate. This causes the filter screen 27 to rotate intermittently inside the filter chamber 17. When the filter screen 27 rotates to the backflushing position, high-temperature desorption gas enters the filter chamber 17 through the desorption outlet pipe 20 and the first guide shroud 21, and acts on the filter screen 27, thereby achieving backflushing of waste debris on the surface of the filter screen 27. During the backflushing process, the waste debris falls from the upper filter screen 27 to the lower filter screen 27. The filter screen 27 has a larger pore size in the lower layer, which facilitates the gradual falling of waste particles. During this process, the rotation of a single filter screen 27 while the others remain stationary allows the high-temperature desorption gas to backwash the rotating filter screen 27, thus cleaning the filter screen 27. In addition, the rotation of the filter screen 27 causes it to interact with the brush 35, further causing the waste particles on the filter screen 27 to fall to the tangential air inlet 38, which is beneficial for the removal of waste particles.

[0058] The cleaned waste debris enters the conical separation chamber 18 through the tangential air inlet 38 along with the desorbed gas, achieving cyclone separation. The internal swirling airflow is then discharged through the second guide shroud 37 and the second exhaust pipe 5, which is beneficial for the collection of high-concentration organic waste gas. The waste debris is discharged through the slag discharge pipe 7.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0060] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A VOC waste gas recovery and treatment device for color-coated steel sheet production, comprising a housing (2) and a zeolite rotor assembly installed within the housing (2), the zeolite rotor assembly having an adsorption zone, a desorption zone, and a cooling zone, characterized in that, Also includes: The filter screen (27) is set on the exhaust gas inlet path of the zeolite rotor assembly and is located upstream of the adsorption zone to filter the exhaust gas entering the adsorption zone. The filter screen (27) rotates around the axis, causing its filtration area to periodically shift to the position corresponding to the desorption area. The desorption area then reversely conveys desorption gas to the surface of the filter screen (27) that has shifted to that position, for backwashing to remove filter debris. The filter screens (27) are arranged in at least two sets and stacked along the airflow direction. The mesh size of the filter screens (27) decreases step by step along the airflow direction. Each set of filter screens (27) rotates independently, and the filtration area of ​​each set of filter screens (27) is alternately shifted to the area below the desorption zone, so that the high-temperature desorbed gas removes the waste debris on each set of filter screens (27) in stages. Also includes: The filter chamber (17) is coaxially arranged on the outer periphery of the filter screen (27), and its inner wall is rotatably sealed with the outer edge of the filter screen (27); The isolation spokes (28) are fixed radially on the upper and lower sides of the filter screen (27), so that the surface of the filter screen (27) forms relatively independent filter sectors; A sector-shaped partition (33) is provided between two sets of filter screens (27) in the upper and lower positions, and the central angle corresponding to the sector-shaped partition (33) is greater than the sum of the central angles corresponding to the two adjacent filter sectors; Among them, the fan-shaped partition (33) has a through hole (34) in the middle, the axis of the through hole (34) coincides with the center line of the exhaust gas inlet path, and the isolation spokes (28) and the fan-shaped partition (33) are fitted together to form an airtight sliding pair, so that the exhaust gas inlet path on the filter screen (27) is in a relatively sealed state.

2. The VOC waste gas recovery and treatment device for color-coated steel sheet production according to claim 1, characterized in that, Also includes: A conical separation chamber (18) is coaxially fixed to the lower end of the filter chamber (17); The chassis (39) is located at the bottom of the filter chamber (17). The upper surface of the chassis (39) and the bottom fan-shaped partition (33) form a dynamic sealed chamber, so that the exhaust gas inlet path on the filter screen (27) located therein is in a relatively sealed state. The top cover (36) is located at the upper end of the conical separation chamber (18) and is fixedly connected to the chassis (39); The top cover (36) is provided with a tangential air inlet (38), the center line of which is tangential to the inner wall of the conical separation chamber (18), which is used to guide the desorbed gas containing debris after backflushing into the interior of the conical separation chamber (18) to achieve cyclone separation of waste debris and desorbed gas. The chassis (39) has inclined structures at both ends, so that the waste debris at the bottom of the filter chamber (17) slides along the inclined structure to the tangential air inlet (38).

3. The VOC waste gas recovery and treatment device for color-coated steel sheet production according to claim 2, characterized in that, The filter chamber (17) is provided with a transmission assembly in the middle for driving the filter screen (27) to rotate. The transmission assembly includes: The bushing (22) is rotatably mounted on the shaft inside the filter chamber (17); The incomplete gear (30) is fixed to the outside of the bushing (22) and is on the same horizontal plane as the corresponding filter screen (27); The filter screen (27) has a hole at its axis and the inner wall of the hole is fixed with the ring internal gear (29). The pinion (31) is rotatably mounted between the incomplete gear (30) and the ring internal gear (29), and meshes with the incomplete gear (30) and the ring internal gear (29); Among them, the central angle value θ corresponding to the teeth on the incomplete gear (30) is 360° / N, where N is the number of filter screens (27), and the projection of the teeth on the incomplete gear (30) in the plane forms a complete gear structure.

4. The VOC waste gas recovery and treatment device for color-coated steel sheet production according to claim 3, characterized in that, The zeolite rotor assembly includes: The rotating frame (14) is rotatably installed inside the upper part of the outer shell (2), and a bottom support (51) is provided at the bottom of the frame, and a second isolation plate (50) is installed at equal intervals along the radial direction inside the frame. Zeolite wheel core (44) is installed between two adjacent second partition plates (50); The fixing bracket (43) is fixed to the end of the zeolite wheel core (44) away from the bottom bracket (51); The first isolation plate (45) is fixed inside the outer shell (2) and located below the rotating wheel frame (14). A cavity is provided between it and the rotating wheel frame (14). The first isolation plate (45) is provided with an adsorption zone inlet (49). A second sealing cover (46) is installed on the side of the first isolation plate (45) located at the adsorption zone inlet (49). The second sealing cover (46) is provided with a cooling zone inlet (48) and a desorption zone outlet (47). The first sealing cover (42) is fixed inside the upper end of the outer shell (2) and corresponds to the position of the second sealing cover (46). The first sealing cover (42) is equipped with a cooling return air pipe (40) adapted to the cooling zone inlet (48) and a desorption air inlet pipe (41) adapted to the desorption zone outlet (47). The heat exchanger (3) is fixed to the outside of the shell (2). The cold source input end of the heat exchanger (3) is connected to the cooling return gas pipe (40) and the heat source output end of the heat exchanger (3) is connected to the desorption inlet pipe (41). Among them, the area corresponding to the cooling return gas pipe (40) is the cooling zone, the area corresponding to the desorption inlet pipe (41) is the desorption zone, and the area between the cooling zone and the desorption zone is the adsorption zone.

5. A VOC waste gas recovery and treatment device for color-coated steel sheet production according to claim 4, characterized in that, An adsorption gas pipe (32) is installed on the inlet (49) of the adsorption zone. A cooling pipe (19) communicating with the inlet (48) of the cooling zone is provided on one side of the adsorption gas pipe (32). A desorption outlet pipe (20) is provided on the outlet (47) of the desorption zone. A first guide hood (21) with a long strip structure is installed at the lower end of the desorption outlet pipe (20). The first guide hood (21) is communicating with the filter chamber (17). The filter chamber (17) has an air inlet pipe (6) fixed at the lower end directly below the adsorption gas pipe (32), and the filter chamber (17) has a second exhaust pipe (5) rotatably connected to the bushing (22) in the middle. The lower end of the second exhaust pipe (5) extends to the upper end of the conical separation chamber (18) and is equipped with a second guide hood (37).

6. A VOC waste gas recovery and treatment device for color-coated steel sheet production according to claim 5, characterized in that: A motor (8) is fixed on the outside of the outer shell (2). A reduction gearbox (9) is provided at the output end of the motor (8). A rotating shaft (11) is provided at the output end of the reduction gearbox (9). A drive wheel (12) is installed at one end of the rotating shaft (11). A driven wheel (15) is fixedly sleeved on the outside of the rotating wheel frame (14). A synchronous transmission belt (13) is provided between the driven wheel (15) and the drive wheel (12). A groove corresponding to the synchronous transmission belt (13) is provided on the outside of the outer shell (2). The lower end of the reduction gearbox (9) is equipped with a transmission gearbox (10). The other end of the rotating shaft (11) extends into the transmission gearbox (10) and is equipped with a fourth bevel gear (26). The housing (2) is radially connected to a transmission shaft (16). One end of the transmission shaft (16) extends into the transmission gearbox (10) and is equipped with a third bevel gear (25) that meshes with the fourth bevel gear (26). The other end of the transmission shaft (16) is fixedly fitted with a second bevel gear (24). The upper end of the bushing (22) passes through the filter chamber (17) and is equipped with a first bevel gear (23) that meshes with the second bevel gear (24).

7. A VOC waste gas recovery and treatment device for color-coated steel sheet production according to any one of claims 2-6, characterized in that: The bottom of the outer shell (2) is equipped with a base (1), and the base (1) is provided with a slag discharge pipe (7), which is used to output waste chips from the bottom of the conical separation chamber (18).

8. A VOC waste gas recovery and treatment device for color-coated steel sheet production according to claim 7, characterized in that: The filter chamber (17) is equipped with a brush (35), which is located below the filter screen (27) and close to the tangential air inlet (38) and is used to scrape off the waste debris on the lower surface of the filter screen (27).

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