A VOCs exhaust gas treatment device for an aqueous paint production line and a treatment method and system thereof

Abstract

This invention relates to the field of waste gas treatment technology, specifically to a VOCs waste gas treatment device and its treatment method and system for a water-based paint production line. The device includes a cabinet, a zeolite rotor, a fan-shaped rectifier plate, and a wind speed sensor. By setting a radially partitioned fan-shaped rectifier plate with adjustable aperture on the windward side of the zeolite rotor adsorption zone, and cooperating with a wind speed sensor on the leeward side to monitor the wind speed in each zone in real time, when the wind speed in a certain zone deviates from the set value, the adjustable aperture of the corresponding zone is dynamically adjusted. This achieves precise control of the airflow distribution at the air inlet face of the zeolite rotor adsorption zone, solving the technical problem that existing fixed rectifier plates cannot dynamically adapt to airflow fluctuations, equipment aging, environmental changes, and other operating conditions leading to uneven airflow distribution and decreased adsorption efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically to a VOCs waste gas treatment device, treatment method, and treatment system for a water-based paint production line. Background Technology

[0002] Zeolite rotary concentrator systems are currently the core equipment for treating large volumes of low-concentration VOCs waste gas, and are widely used in industries such as automotive painting, furniture manufacturing, and packaging printing. Their working principle involves passing waste gas through the adsorption zone, where volatile organic compounds are adsorbed by the zeolite. The saturated zeolite is then rotated into the desorption zone, where hot air is used for desorption and regeneration. The desorbed, high-concentration waste gas is then sent to subsequent treatment units for oxidation and decomposition. The regenerated zeolite is cooled in a cooling zone and then returned to the adsorption zone, enabling continuous operation.

[0003] In practical engineering applications, waste gas is typically transported to the inlet face of the zeolite rotor adsorption zone via pipelines. Due to the natural distribution of airflow velocity within the pipeline, the airflow velocity is high in the center and slow at the edges, forming a significant radial velocity gradient. This uneven airflow distribution directly leads to inconsistent waste gas treatment loads in different radial regions of the zeolite rotor adsorption zone: the central region has a high flow velocity, resulting in a large volume of waste gas passing through per unit time, rapid adsorbent saturation, and a tendency for localized penetration; while the edge regions have a slow flow velocity, resulting in a small waste gas treatment volume, low adsorbent utilization, and wasted adsorption capacity.

[0004] To address these issues, existing technologies typically employ rectifiers or flow guides on the inlet side to adjust airflow distribution by altering local resistance. However, traditional rectifiers are mostly fixed structures, and their aperture distribution can only be optimized for a single design condition. When dealing with fluctuations in airflow, changes in exhaust gas concentration, alterations in the zeolite rotor's operating state, or changes in environmental conditions, the original fixed resistance distribution cannot dynamically adapt to the new flow field requirements, leading to decreased airflow uniformity and reduced adsorption efficiency. Furthermore, fixed rectifiers struggle to compensate for changes in airflow distribution caused by factors such as localized blockage of the zeolite rotor and fan performance degradation, making maintenance and adjustments difficult and hindering the guarantee of long-term operational stability and high efficiency.

[0005] Therefore, how to achieve dynamic and precise adjustment of the airflow distribution at the air inlet face of the zeolite rotor adsorption zone to adapt to changing operating conditions and equipment status has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the problems existing in the prior art, a VOCs waste gas treatment device, treatment method, and treatment system for water-based paint production lines are provided. By setting a radially partitioned fan-shaped rectifier plate with adjustable aperture on the windward side of the zeolite rotor adsorption zone, and cooperating with a wind speed sensor on the leeward side to monitor the wind speed in each zone in real time, when the wind speed in a certain zone deviates from the set value, the aperture of the adjustable channel in the corresponding zone is dynamically adjusted. This achieves precise control of the airflow distribution at the air inlet end face of the zeolite rotor adsorption zone, solving the technical problem that existing fixed rectifier plates cannot dynamically adapt to airflow fluctuations, equipment aging, environmental changes, and other operating conditions, resulting in uneven airflow distribution and decreased adsorption efficiency.

[0007] To address the problems of existing technologies, this invention provides a VOCs waste gas treatment device for a water-based paint production line, comprising a cabinet; a zeolite rotor rotatably disposed within the cabinet and having a fan-shaped adsorption zone, a desorption zone, and a cooling zone, wherein the two ends of the zeolite rotor and the inner wall of the cabinet respectively enclose an air inlet chamber and an air outlet chamber; a hot air chamber communicating with the desorption zone is disposed within the air outlet chamber; a desorption chamber communicating with the desorption zone and a cooling chamber communicating with the cooling zone are disposed within the air inlet chamber; a fan-shaped rectifier plate is coaxially disposed on the windward side of the adsorption zone of the zeolite rotor, and adjustable channels are distributed on the fan-shaped rectifier plate; the fan-shaped rectifier plate is divided radially into The fan-shaped rectifier plate is divided into an inner ring zone, a middle ring zone, and an outer ring zone. An aperture adjustment component is also provided on the fan-shaped rectifier plate, which is used to simultaneously adjust the aperture of the adjustable channels in the inner ring zone, the middle ring zone, and the outer ring zone. Wind speed sensors are radially distributed along the leeward side of the fan-shaped rectifier plate, with each wind speed sensor corresponding to one of the inner ring zone, the middle ring zone, or the outer ring zone of the fan-shaped rectifier plate. When the wind speed in a certain area on the leeward side of the zeolite rotor adsorption zone is lower than a set value, the aperture adjustment component reduces the aperture of the adjustable channel in the fan-shaped rectifier plate corresponding to that area, and simultaneously increases the aperture of the adjustable channels in the remaining areas.

[0008] Preferably, the cabinet is provided with a hot air inlet that communicates with the hot air cavity.

[0009] Preferably, the cabinet is provided with a cold air outlet communicating with the cooling chamber and an exhaust gas outlet communicating with the desorption chamber.

[0010] Preferably, the fan-shaped rectifier plate includes: a fan-shaped fixed plate, fixedly disposed on the windward side of the zeolite rotor adsorption zone, the fan-shaped fixed plate having evenly distributed fixing holes; three arc-shaped movable plates, coaxially rotatably disposed on one side of the fan-shaped fixed plate, the diameters of the three arc-shaped movable plates decreasing sequentially and respectively forming the inner ring region, the middle ring region, and the outer ring region; each of the arc-shaped movable plates has movable holes distributed thereon, the movable holes corresponding one-to-one with the fixing holes; the overlapping area of ​​the movable holes and the fixing holes forms the adjustable channel, and the diameter of the adjustable channel changes with the rotation of the arc-shaped movable plates.

[0011] Preferably, the aperture adjustment assembly includes: an arc-shaped toothed plate, coaxially disposed on one side of the arc-shaped movable plate; a bevel gear, rotatably disposed on one side of the arc-shaped movable plate and meshing with the arc-shaped toothed plate; and a servo motor disposed in the air inlet cavity, the output shaft of the servo motor passing through the fan-shaped rectifier plate and being connected to the bevel gear for transmission.

[0012] Preferably, the fan-shaped fixed plate is provided with an arc-shaped groove coaxial with it, and the arc-shaped movable plate is provided with a positioning bolt that passes through the arc-shaped groove and slides with it.

[0013] Preferably, the fan-shaped rectifier plate includes: a first fan-shaped air vane and a second fan-shaped air vane, coaxially correspondingly disposed on the windward side of the zeolite rotor adsorption zone, the first fan-shaped air vane having a first air hole and the second fan-shaped air vane having a second air hole; two arc-shaped strips, coaxially disposed between the first fan-shaped air vane and the second fan-shaped air vane, dividing the space between them into an independent and closed inner ring area, a middle ring area and an outer ring area; the aperture adjustment component includes air pressure adjustment holes that correspond one-to-one with the inner ring area, the middle ring area and the outer ring area; a rubber cylinder, coaxially disposed between the first air hole and the second air hole, wherein, when the air pressure of the inner ring area, the middle ring area or the outer ring area is adjusted through the air pressure adjustment hole, the rubber cylinder located in the corresponding ring area contracts or expands radially with the air pressure change, so as to change the airflow channel size between the first air hole and the second air hole.

[0014] Preferably, the fan-shaped rectifier plate further includes a positioning cylinder, each positioning cylinder being coaxially disposed between the corresponding first air hole and the second air hole, and the positioning cylinder having at least one opening on its cylinder wall; sealing rings are respectively provided at both ends of the rubber cylinder, the rubber cylinder being sleeved on the outside of the positioning cylinder, and the sealing rings being pressed between the end of the positioning cylinder and the corresponding first fan-shaped air plate or the second fan-shaped air plate.

[0015] A method for treating VOCs waste gas in a water-based paint production line, employing a VOCs waste gas treatment device for a water-based paint production line, includes the following steps: Step 1: VOCs waste gas generated by the water-based paint production line is introduced into the air inlet cavity, so that the waste gas passes evenly through the fan-shaped rectifier plate and enters the adsorption zone of the zeolite rotor. Step 2: The wind speed in different radial regions on the leeward side of the zeolite rotor adsorption zone is monitored in real time by each of the wind speed sensors, and the wind speed signal is transmitted to the controller. Step 3: When the wind speed in a certain area is lower than the set value, the controller controls the aperture adjustment component to reduce the aperture of the adjustable channel in the fan-shaped rectifier plate corresponding to that area, and at the same time increases the aperture of the adjustable channel in other areas until the wind speed in each area returns to the set range. Step four: After the waste gas is adsorbed and purified in the adsorption zone, it enters the desorption zone and the cooling zone in sequence through the rotation of the zeolite rotor. In the desorption zone, it is desorbed and regenerated by hot air. The high-concentration waste gas after desorption is sent to the subsequent treatment unit. After being cooled in the cooling zone, the regenerated zeolite rotor is rotated back into the adsorption zone.

[0016] A VOCs exhaust gas treatment system for a water-based paint production line includes a three-stage dry filtration system, an acid washing spray system, a demister, a VOCs exhaust gas treatment device for a water-based paint production line, and a regenerative thermal burner.

[0017] The advantages of this application compared to the prior art are: This application, through real-time monitoring by a wind speed sensor and coordinated action of an aperture adjustment component, can dynamically adjust the airflow resistance of each radial region according to changes in actual operating conditions, so that the airflow velocity at the air inlet face of the adsorption zone remains uniform, avoiding the problem of decreased uniformity of fixed rectifier plates due to changes in operating conditions.

[0018] The uniform airflow distribution makes the waste gas treatment load in each radial area of ​​the adsorption zone more consistent, avoiding the problem of premature saturation in the central area due to excessive flow velocity and insufficient utilization in the edge area due to excessive flow velocity. This allows the zeolite adsorption capacity to be fully utilized and extends the service life of the zeolite.

[0019] When dealing with fluctuations in air volume, changes in exhaust gas concentration, partial blockage of the zeolite rotor, or deterioration in fan performance, this device can automatically compensate for changes in the flow field, always maintaining the optimal airflow distribution state, and ensuring that the system can operate efficiently and stably under different operating conditions. Attached Figure Description

[0020] Figure 1 This is a perspective view of a VOCs waste gas treatment device for a water-based paint production line according to the present invention.

[0021] Figure 2 This is a perspective sectional view of a VOCs waste gas treatment device for a water-based paint production line according to the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of a VOCs waste gas treatment device for a water-based paint production line according to the present invention, viewed from a first perspective.

[0023] Figure 4 This is a schematic diagram of the internal structure of a VOCs waste gas treatment device for a water-based paint production line according to the present invention, viewed from a second perspective.

[0024] Figure 5 This is a perspective view of a first embodiment of a fan-shaped rectifier plate in a VOCs waste gas treatment device for a water-based paint production line according to the present invention, viewed from a first perspective.

[0025] Figure 6 This is a perspective view of a first embodiment of a fan-shaped rectifier plate in a VOCs waste gas treatment device for a water-based paint production line according to the present invention, viewed from a second perspective.

[0026] Figure 7 This is a perspective view of a second embodiment of the fan-shaped rectifier plate in a VOCs waste gas treatment device for a water-based paint production line according to the present invention, viewed from a first perspective.

[0027] Figure 8 This is an exploded perspective view of a fan-shaped rectifier plate in a VOCs waste gas treatment device for a water-based paint production line according to the present invention.

[0028] Figure 9 This is an axial sectional view of the rubber cylinder and positioning cylinder in a VOCs waste gas treatment device for a water-based paint production line according to the present invention.

[0029] Figure 10 This is an exploded perspective view of the rubber cylinder and positioning cylinder in a VOCs waste gas treatment device for a water-based paint production line according to the present invention.

[0030] The diagram is labeled as follows: 1. Cabinet; 11. Air inlet chamber; 12. Air outlet chamber; 13. Hot air chamber; 14. Desorption chamber; 15. Cooling chamber; 16. Hot air inlet; 17. Cold air outlet; 18. Exhaust gas outlet; 2. Zeolite rotor; 3. Fan-shaped rectifier plate; 31. Adjustable channel; 321. Arc-shaped toothed plate; 322. Bevel gear; 323. Servo motor; 324. Air pressure regulating hole; 33. Fan-shaped fixing plate; 331. Fixing hole; 332. Arc-shaped groove; 34. Arc-shaped movable plate; 341. Movable hole; 35. Positioning bolt; 36. First fan-shaped air vane; 361. First air hole; 37. Second fan-shaped air vane; 371. Second air hole; 38. Arc-shaped strip; 391. Rubber cylinder; 3911. Sealing ring; 392. Positioning cylinder; 3921. Opening. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 4 As shown, a VOCs exhaust gas treatment device for a water-based paint production line includes a cabinet 1; a zeolite rotor 2, rotatably disposed in the cabinet 1 and having a fan-shaped adsorption zone, desorption zone, and cooling zone, wherein the two ends of the zeolite rotor 2 and the inner wall of the cabinet 1 respectively enclose an air inlet chamber 11 and an air outlet chamber 12; a hot air chamber 13 connected to the desorption zone is provided in the air outlet chamber 12; a desorption chamber 14 connected to the desorption zone and a cooling chamber 15 connected to the cooling zone are provided in the air inlet chamber 11; a fan-shaped rectifier plate 3, coaxially disposed on the windward side of the adsorption zone of the zeolite rotor 2, and adjustable channels 31 are distributed on the fan-shaped rectifier plate 3; the fan-shaped rectifier plate 3 is radially... The system is divided into an inner ring area, a middle ring area, and an outer ring area. An aperture adjustment component is also provided on the fan-shaped rectifier plate 3, which is used to simultaneously adjust the aperture of the adjustable channels 31 in the inner ring area, the middle ring area, and the outer ring area. Wind speed sensors are radially distributed along the leeward side of the fan-shaped rectifier plate 3, with each wind speed sensor corresponding to the inner ring area, the middle ring area, and the outer ring area of ​​the fan-shaped rectifier plate 3, respectively. When the wind speed in a certain area on the leeward side of the zeolite rotor 2 adsorption zone is lower than a set value, the aperture adjustment component reduces the aperture of the adjustable channel 31 in the fan-shaped rectifier plate 3 corresponding to that area, and simultaneously increases the aperture of the adjustable channels 31 in the remaining areas.

[0033] During operation, the VOCs waste gas generated by the water-based paint production line first enters the air inlet chamber 11, then passes through the fan-shaped rectifier plate 3 and enters the adsorption zone of the zeolite rotor 2 for adsorption and purification. During this process, each wind speed sensor monitors the airflow velocity in different radial areas in real time and transmits the wind speed signal to the controller.

[0034] When the wind speed in a certain area is lower than the set value, it indicates that the airflow in that area is too low, which may lead to insufficient adsorbent utilization. Simultaneously, it means that the airflow in other areas is too high, posing a risk of localized overload penetration. The controller, based on the wind speed deviation signal, controls the aperture adjustment component to reduce the aperture of the adjustable channel 31 corresponding to that area, increasing the flow resistance in that area and forcing the airflow to be diverted to other areas. At the same time, it correspondingly increases the aperture of the adjustable channels 31 in other areas, reducing their flow resistance and attracting more airflow. Through this coordinated adjustment, the wind speed in each area quickly returns to the set range, achieving a uniform distribution of airflow at the inlet face of the adsorption zone.

[0035] After the evenly distributed airflow passes through the adsorption zone of the zeolite rotor 2, the VOCs in the waste gas are adsorbed and purified by the zeolite, and the purified gas is discharged into the outlet chamber 12. As the zeolite rotor 2 rotates slowly, the saturated zeolite moves into the desorption zone, where hot air supplied by the hot air chamber 13 desorbs and regenerates it. The high-concentration VOCs waste gas generated by desorption is drawn out through the desorption chamber 14 and sent to the subsequent treatment unit for oxidation and decomposition. The regenerated zeolite rotor 2 continues to rotate into the cooling zone, where cooling air introduced by the cooling chamber 15 cools it down before it returns to the adsorption zone to start a new adsorption cycle.

[0036] like Figure 1 and Figure 3 As shown, the cabinet 1 is provided with a hot air inlet 16 that communicates with the hot air chamber 13.

[0037] During operation, high-temperature hot air generated by an external hot air generator enters the hot air chamber 13 through the hot air inlet 16. After fully diffusing within the hot air chamber 13, it acts evenly on the desorption zone of the zeolite rotor 2. The cavity structure of the hot air chamber 13 acts as a buffer and pressure equalizer, ensuring a uniform pressure distribution and stable temperature field for the hot air entering the desorption zone. The uniform hot air passes through the zeolite channels in the desorption zone, efficiently desorbing the adsorbed VOCs. The high-concentration waste gas after desorption is discharged after flowing through the desorption chamber 14 with the hot air.

[0038] The hot air inlet 16 provides a standard interface for external hot air sources, facilitating connection with various hot air generators (such as electric heaters, gas heaters, and waste heat recovery devices), thus improving the system's versatility and adaptability.

[0039] like Figure 1 and Figure 3 As shown, the cabinet 1 is provided with a cold air outlet 17 that communicates with the cooling chamber 15 and an exhaust gas outlet 18 that communicates with the desorption chamber 14.

[0040] During operation, the cooling air, after being cooled by the regenerated zeolite rotor 2 in the cooling zone, is discharged from the cabinet 1 through the cold air outlet 17; the high-concentration VOCs waste gas generated in the desorption zone is drawn out through the waste gas outlet 18 and sent to the subsequent treatment unit (such as a regenerative thermal combustion device) for oxidation and decomposition. The cold air outlet 17 and the waste gas outlet 18 are set independently, so that the cooling airflow and the desorbed waste gas each have their own path and do not interfere with each other.

[0041] The independent design of the cold air outlet 17 and the exhaust gas outlet 18 avoids cross-mixing between the cooling air and the desorbed exhaust gas, ensuring the high concentration characteristics of the desorbed exhaust gas, which is beneficial to reducing energy consumption and improving treatment efficiency of subsequent treatment units. The clearly defined outlet channel design makes the airflow organization in the cooling zone and desorption zone more orderly, reduces eddies and dead zones in the cavity, and improves cooling efficiency and desorption efficiency.

[0042] like Figure 5 and Figure 6 As shown, the fan-shaped rectifier plate 3 includes: a fan-shaped fixed plate 33, which is fixedly set on the windward side of the adsorption zone of the zeolite rotor 2, and fixed holes 331 are evenly distributed on the fan-shaped fixed plate 33; three arc-shaped movable plates 34, which are coaxially rotatably set on one side of the fan-shaped fixed plate 33, and the diameters of the three arc-shaped movable plates 34 decrease sequentially and respectively form an inner ring area, a middle ring area and an outer ring area; each arc-shaped movable plate 34 is provided with movable holes 341, and the movable holes 341 are set one-to-one with the fixed holes 331; the overlapping area of ​​the movable holes 341 and the fixed holes 331 forms an adjustable channel 31, and the diameter of the adjustable channel 31 changes with the rotation of the arc-shaped movable plate 34.

[0043] In the first embodiment of the fan-shaped rectifier plate 3, during operation, when it is necessary to adjust the airflow resistance of a certain ring area, the aperture adjustment component drives the corresponding arc-shaped movable plate 34 to rotate around its axis. As the arc-shaped movable plate 34 rotates, the relative position between its movable hole 341 and the fixed hole 331 on the fan-shaped fixed plate 33 changes, and the area of ​​their overlapping region changes accordingly, thereby altering the effective aperture of the adjustable channel 31. When the overlap area between the movable hole 341 and the fixed hole 331 increases, the aperture increases, and the airflow resistance decreases; when the overlap area decreases, the aperture decreases, and the airflow resistance increases. By independently adjusting the rotation angle of the three arc-shaped movable plates 34, the aperture size of the inner ring area, middle ring area, and outer ring area can be precisely controlled, achieving independent adjustment of the airflow resistance in different radial regions.

[0044] The aperture adjustment is achieved through the relative rotation of the fixed plate and the movable plate. This design is simple, reliable, has few moving parts, and is easy to manufacture and maintain. The one-to-one correspondence between the movable orifice 341 and the fixed orifice 331 ensures consistency in the channels during adjustment, avoiding secondary flow field distortion caused by uneven local resistance. Three independently set arc-shaped movable plates 34 allow for individual adjustment of the aperture in each annular region, achieving precise control of the radial airflow distribution. The overlap area between the movable orifice 341 and the fixed orifice 331 changes continuously with the rotation angle, enabling stepless aperture adjustment with high precision and a wide range. This structure maintains the regular shape of the channels while adjusting the aperture, avoiding increased turbulence and resistance loss that may result from irregularly shaped channels. The rotation adjustment method of the arc-shaped movable plates 34 facilitates integration with automated control systems, enabling closed-loop control based on wind speed feedback.

[0045] like Figure 6 As shown, the aperture adjustment assembly includes: an arc-shaped toothed plate 321, coaxially disposed on one side of the arc-shaped movable plate 34; a bevel gear 322, rotatably disposed on one side of the arc-shaped movable plate 34 and meshing with the arc-shaped toothed plate 321; and a servo motor 323, disposed in the air inlet cavity 11, the output shaft of the servo motor 323 passing through the fan-shaped rectifier plate 3 and being connected to the bevel gear 322 for transmission.

[0046] During operation, the servo motor 323 starts upon receiving a control signal, and its output shaft drives the bevel gear 322 to rotate around its own axis. The bevel gear 322, through meshing with the arc-shaped toothed plate 321, transmits the rotational motion to the arc-shaped movable plate 34, driving it to rotate around its axis. By controlling the rotation direction and angle of the servo motor 323, the rotation direction and angle of the arc-shaped movable plate 34 can be precisely controlled, thereby achieving precise adjustment of the aperture of the adjustable channel 31 in the corresponding ring area. The high-precision control and fast response characteristics of the servo motor 323 enable the aperture adjustment to respond in real time to the feedback signal from the wind speed sensor, achieving closed-loop control.

[0047] The transmission method using bevel gear 322 and arc-shaped toothed plate 321 achieves a compact transmission between the output shaft of servo motor 323 and arc-shaped movable plate 34. This design is simple in structure, occupies little space, and is easy to arrange within the air inlet cavity 11. The bevel gear 322 transmission has a large transmission ratio, capable of converting the high-speed, low-torque output of servo motor 323 into the low-speed, high-torque output of arc-shaped movable plate 34, thus meeting the adjustment torque requirements for overcoming airflow resistance.

[0048] like Figure 5 As shown, the fan-shaped fixed plate 33 is provided with an arc-shaped groove 332 coaxial with it, and the arc-shaped movable plate 34 is provided with a positioning bolt 35 that passes through the arc-shaped groove 332 and slides with it.

[0049] During operation, as the arc-shaped movable plate 34 rotates around its axis under the drive of the aperture adjustment assembly, the positioning pin 35 slides synchronously along the arc-shaped groove 332. The arc-shaped groove 332 provides radial constraint and circumferential guidance for the positioning pin 35, ensuring that the arc-shaped movable plate 34 maintains coaxiality with the sector-shaped fixed plate 33 during rotation, avoiding radial offset or sway. The sliding fit between the positioning pin 35 and the arc-shaped groove 332 also provides auxiliary support, reducing the load on the rotating mechanism caused by the weight of the arc-shaped movable plate 34 itself.

[0050] The engagement of the arc-shaped groove 332 and the positioning pin 35 provides precise rotation guidance for the arc-shaped movable plate 34, ensuring that its rotation trajectory strictly follows the predetermined circumference. This avoids misalignment between the movable hole 341 and the fixed hole 331 due to radial offset, guaranteeing the accuracy of hole diameter adjustment. This guiding structure effectively prevents the arc-shaped movable plate 34 from swaying under airflow impact, improving the stability and reliability of the adjustment mechanism. The engagement of the positioning pin 35 and the arc-shaped groove 332 also serves as a limiting function, restricting excessive rotation of the arc-shaped movable plate 34 and protecting the transmission mechanism from impacts at extreme positions.

[0051] like Figure 8 , Figure 9 and Figure 10As shown, the fan-shaped rectifier plate 3 includes: a first fan-shaped air plate 36 and a second fan-shaped air plate 37, which are coaxially and correspondingly arranged on the windward side of the adsorption zone of the zeolite rotor 2. The first fan-shaped air plate 36 is provided with a first air hole 361, and the second fan-shaped air plate 37 is provided with a second air hole 371; two arc-shaped strips 38 are coaxially arranged between the first fan-shaped air plate 36 and the second fan-shaped air plate 37, and divide the space between them into an independent and closed inner ring area, a middle ring area and an outer ring area. The aperture adjustment assembly includes air pressure adjustment holes 324 that correspond one-to-one with the inner ring area, middle ring area and outer ring area; and a rubber cylinder 391, which is coaxially disposed between the first air hole 361 and the second air hole 371. When the air pressure of the inner ring area, middle ring area or outer ring area is adjusted through the air pressure adjustment hole 324, the rubber cylinder 391 located in the corresponding ring area contracts or expands radially with the air pressure change, so as to change the airflow channel size between the first air hole 361 and the second air hole 371.

[0052] As a second embodiment of the fan-shaped rectifier plate 3, during operation, when it is necessary to adjust the airflow resistance of a certain annular region, compressed air is injected into the closed annular region or negative pressure is created by suction through the air pressure regulating hole 324 connected to the annular region, thereby changing the air pressure of the annular region. The air pressure change acts on the outer periphery of all the rubber cylinders 391 in the annular region, causing the rubber cylinders 391 to contract or expand radially with the air pressure change.

[0053] When the air pressure in the annular zone increases, the rubber cylinder 391 is compressed and contracts radially, increasing its inner diameter. This increases the size of the airflow channel between the first air hole 361 and the second air hole 371, reducing airflow resistance. Conversely, when the air pressure in the annular zone decreases, the rubber cylinder 391 expands and expands radially, decreasing its inner diameter. This reduces the size of the airflow channel, increasing airflow resistance. By independently adjusting the air pressure in the three annular zones, the airflow channel sizes in the inner, middle, and outer annular zones can be precisely controlled, enabling independent adjustment of airflow resistance in different radial regions.

[0054] The orifice diameter is adjusted by using pneumatically driven deformation of the rubber cylinder 391, achieving contactless adjustment and completely avoiding wear issues associated with mechanical moving parts, thus significantly improving the reliability and service life of the device. The rubber cylinder 391 exhibits rapid contraction and expansion response, enabling real-time tracking of air pressure changes and achieving dynamic and rapid airflow adjustment. Air pressure adjustment is stepless and continuous, offering high precision and a wide adjustment range (the inner diameter of the rubber cylinder 391 can continuously vary within a certain range). The closed-loop design allows for independent and controllable air pressure in each loop, preventing interference and achieving precise zonal control of radial airflow distribution. The rubber cylinder 391 possesses excellent sealing and elasticity, maintaining stable performance even under long-term alternating loads.

[0055] like Figure 8 , Figure 9 and Figure 10As shown, the fan-shaped rectifier plate 3 also includes a positioning cylinder 392. Each positioning cylinder 392 is coaxially arranged between the corresponding first air hole 361 and second air hole 371. At least one opening 3921 is provided on the cylinder wall of the positioning cylinder 392. Sealing rings 3911 are respectively provided at both ends of the rubber cylinder 391. The rubber cylinder 391 is sleeved on the outside of the positioning cylinder 392, and the sealing rings 3911 are pressed between the end of the positioning cylinder 392 and the corresponding first fan-shaped air plate 36 or second fan-shaped air plate 37.

[0056] During operation, when the air pressure within the annular zone changes, the air pressure acts on the outer periphery of the rubber cylinder 391 through the opening 3921 on the wall of the positioning cylinder 392. Under the action of air pressure, the rubber cylinder 391 contracts or expands radially. Due to the axial fixing effect of the sealing ring 3911, the rubber cylinder 391 only undergoes radial deformation and does not produce axial displacement. The positioning cylinder 392 provides support for the inner periphery of the rubber cylinder 391, preventing instability or twisting when the rubber cylinder 391 contracts excessively.

[0057] The positioning cylinder 392 provides a precise installation positioning reference for the rubber cylinder 391, ensuring that the rubber cylinder 391 remains coaxial with the first air hole 361 and the second air hole 371, avoiding uneven deformation and sealing failure caused by misalignment. The sealing ring 3911 is pressed between the end of the positioning cylinder 392 and the fan-shaped air plate, achieving reliable axial fixation of the rubber cylinder 391, preventing axial movement under alternating air pressure, and ensuring the stability and repeatability of adjustment. The opening 3921 on the cylinder wall of the positioning cylinder 392 allows the air pressure in the annular area to act evenly on the outer circumference of the rubber cylinder 391, ensuring the uniformity of circumferential deformation of the rubber cylinder 391 and avoiding uneven deformation caused by local air pressure blind spots. The positioning cylinder 392 provides support for the inner circumference of the rubber cylinder 391, improving the rubber cylinder 391's resistance to instability, allowing it to maintain a regular shape under negative pressure, and preventing concavity or collapse.

[0058] A method for treating VOCs waste gas in a water-based paint production line, employing a VOCs waste gas treatment device for a water-based paint production line, includes the following steps: Step 1: VOCs waste gas generated by the water-based paint production line is introduced into the air inlet chamber 11, so that the waste gas passes evenly through the fan-shaped rectifier plate 3 and enters the adsorption zone of the zeolite rotor 2. Step 2: Monitor the wind speed in different radial areas on the leeward side of the zeolite rotor 2 adsorption zone in real time using various wind speed sensors, and transmit the wind speed signal to the controller. Step 3: When the wind speed in a certain area is lower than the set value, the controller controls the aperture adjustment component to reduce the aperture of the adjustable channel 31 in the fan-shaped rectifier plate 3 corresponding to that area, and at the same time increases the aperture of the adjustable channel 31 in other areas until the wind speed in each area returns to the set range. Step four: After the waste gas is adsorbed and purified in the adsorption zone, it enters the desorption zone and the cooling zone in sequence through the rotation of the zeolite rotor 2. In the desorption zone, it is desorbed and regenerated by hot air. The high-concentration waste gas after desorption is sent to the subsequent treatment unit. After being cooled in the cooling zone, the regenerated zeolite rotor 2 is rotated back into the adsorption zone.

[0059] A VOCs exhaust gas treatment system for a water-based paint production line includes a three-stage dry filtration system, an acid washing spray system, a demister, a VOCs exhaust gas treatment device for a water-based paint production line, and a regenerative thermal burner.

[0060] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A VOCs exhaust gas treatment device for an aqueous paint production line, characterized by, include Server rack; A zeolite rotor is rotatably disposed in the cabinet and has a fan-shaped adsorption zone, desorption zone, and cooling zone. The two ends of the zeolite rotor are respectively enclosed by the inner wall of the cabinet to form an air inlet chamber and an air outlet chamber. A hot air chamber connected to the desorption zone is disposed in the air outlet chamber. A desorption chamber connected to the desorption zone and a cooling chamber connected to the cooling zone are disposed in the air inlet chamber. A fan-shaped rectifier plate is coaxially disposed on the windward side of the adsorption zone of the zeolite rotor. Adjustable channels are distributed on the fan-shaped rectifier plate. The fan-shaped rectifier plate is divided into an inner ring zone, a middle ring zone, and an outer ring zone along its radial direction. An aperture adjustment component is also provided on the fan-shaped rectifier plate. The aperture adjustment component is used to simultaneously adjust the aperture of the adjustable channels in the inner ring zone, the middle ring zone, and the outer ring zone. Wind speed sensors are radially distributed on the leeward side of the fan-shaped rectifier, and each wind speed sensor corresponds to the inner ring area, middle ring area and outer ring area of ​​the fan-shaped rectifier, respectively. When the wind speed in a certain area on the leeward side of the zeolite rotor adsorption zone is lower than a set value, the aperture adjustment component reduces the aperture of the adjustable channel in the fan-shaped rectifier plate corresponding to that area, and at the same time increases the aperture of the adjustable channel in the other areas.

2. The VOCs exhaust gas treatment device for a water-based paint production line according to claim 1, characterized in that, The cabinet is equipped with a hot air inlet that communicates with the hot air chamber.

3. The VOCs exhaust gas treatment device for a water-based paint production line according to claim 1, characterized in that, The cabinet is equipped with a cold air outlet connected to the cooling chamber and an exhaust gas outlet connected to the desorption chamber.

4. A VOCs waste gas treatment device for a water-based paint production line according to any one of claims 1-3, characterized in that, The sector-shaped rectifier plate includes: A fan-shaped fixing plate is fixedly set on the windward side of the zeolite rotor adsorption zone, and fixing holes are evenly distributed on the fan-shaped fixing plate; Three arc-shaped movable plates are coaxially and rotatably disposed on one side of the fan-shaped fixed plate. The diameters of the three arc-shaped movable plates decrease sequentially and respectively form the inner ring area, the middle ring area, and the outer ring area. Each arc-shaped movable plate is provided with movable holes, and the movable holes are arranged one-to-one with the fixed holes. The overlapping area of ​​the movable holes and the fixed holes forms the adjustable channel, and the diameter of the adjustable channel changes with the rotation of the arc-shaped movable plates.

5. A VOCs waste gas treatment device for a water-based paint production line according to claim 4, characterized in that, The aperture adjustment assembly includes: An arc-shaped toothed plate is coaxially disposed on one side of the arc-shaped movable plate; A bevel gear is rotatably disposed on one side of the arc-shaped movable plate and meshes with the arc-shaped toothed plate; A servo motor is disposed in the air inlet cavity, and the output shaft of the servo motor passes through the fan-shaped rectifier plate and is connected to the bevel gear transmission.

6. A VOCs waste gas treatment device for a water-based paint production line according to claim 4, characterized in that, The fan-shaped fixed plate is provided with an arc-shaped groove coaxial with it, and the arc-shaped movable plate is provided with a positioning bolt that passes through the arc-shaped groove and slides with it.

7. A VOCs waste gas treatment device for a water-based paint production line according to any one of claims 1-3, characterized in that, The sector-shaped rectifier plate includes: The first fan-shaped air plate and the second fan-shaped air plate are coaxially and correspondingly arranged on the windward side of the zeolite rotor adsorption zone. The first fan-shaped air plate is provided with a first air hole, and the second fan-shaped air plate is provided with a second air hole. Two arc-shaped strips are coaxially arranged between the first fan-shaped air plate and the second fan-shaped air plate, dividing the space between them into an independent and closed inner ring area, a middle ring area and an outer ring area; the aperture adjustment component includes air pressure adjustment holes that correspond one-to-one with the inner ring area, the middle ring area and the outer ring area; A rubber cylinder is coaxially disposed between the first air hole and the second air hole. When the air pressure of the inner ring area, the middle ring area, or the outer ring area is adjusted through the air pressure regulating hole, the rubber cylinder located in the corresponding ring area contracts or expands radially with the air pressure change, thereby changing the airflow channel size between the first air hole and the second air hole.

8. A VOCs waste gas treatment device for a water-based paint production line according to claim 7, characterized in that, The fan-shaped rectifier plate also includes a positioning cylinder, each positioning cylinder being coaxially disposed between the corresponding first air hole and the second air hole, and the positioning cylinder having at least one opening on its cylinder wall; sealing rings are respectively provided at both ends of the rubber cylinder, the rubber cylinder being sleeved on the outside of the positioning cylinder, and the sealing rings being pressed between the end of the positioning cylinder and the corresponding first fan-shaped air plate or the second fan-shaped air plate.

9. A method for treating VOCs waste gas in a water-based paint production line, characterized in that, The VOCs waste gas treatment device for a water-based paint production line as described in any one of claims 1-3 includes the following steps: Step 1: VOCs waste gas generated by the water-based paint production line is introduced into the air inlet cavity, so that the waste gas passes evenly through the fan-shaped rectifier plate and enters the adsorption zone of the zeolite rotor. Step 2: The wind speed in different radial regions on the leeward side of the zeolite rotor adsorption zone is monitored in real time by each of the wind speed sensors, and the wind speed signal is transmitted to the controller. Step 3: When the wind speed in a certain area is lower than the set value, the controller controls the aperture adjustment component to reduce the aperture of the adjustable channel in the fan-shaped rectifier plate corresponding to that area, and at the same time increases the aperture of the adjustable channel in other areas until the wind speed in each area returns to the set range. Step four: After the waste gas is adsorbed and purified in the adsorption zone, it enters the desorption zone and the cooling zone in sequence through the rotation of the zeolite rotor. In the desorption zone, it is desorbed and regenerated by hot air. The high-concentration waste gas after desorption is sent to the subsequent treatment unit. After being cooled in the cooling zone, the regenerated zeolite rotor is rotated back into the adsorption zone.

10. A VOCs waste gas treatment system for a water-based paint production line, characterized in that, It includes a three-stage dry filtration system, an acid washing spray system, a demister, a VOCs waste gas treatment device for a water-based paint production line as described in any one of claims 1-3, and a regenerative thermal burner.

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