A paint spray exhaust gas circulation treatment system

Abstract

The application discloses a paint spraying waste gas circulating treatment system, which comprises a paint spraying room, a fresh air fan, a spraying tower, a dry filter, a main circulating fan and a first RTO fan. The paint spraying room comprises a paint spraying processing area, a circulating air area and a recovered air area. The paint spraying processing area is provided with a first air outlet pipe and a second air outlet pipe. The circulating air area is provided with a third air outlet pipe. The recovered air area is provided with an air inlet pipe. The gas output by the first air outlet pipe and the second air outlet pipe is used for taking away the paint mist in the paint spraying processing area. The air outlet of the fresh air fan is connected with the first air outlet pipe. The air inlet of the main circulating fan is connected with the air outlet of the dry filter. The air outlets of the main circulating fan are respectively connected with the second air outlet pipe and the third air outlet pipe, and the air outlet quantity of the second air outlet pipe is greater than that of the third air outlet pipe. The first RTO fan is used for discharging part of the gas output by the air outlet of the main circulating fan. The application can continuously treat and effectively remove the paint mist, and guarantee the stability and cleanliness of the gas circulation of the system.

Description

Technical Field

[0001] This application relates to the field of paint spraying exhaust gas treatment technology, and in particular to a paint spraying exhaust gas recycling treatment system. Background Technology

[0002] The paint spraying exhaust gas recycling system is mainly used to treat the exhaust gas containing paint mist and volatile organic compounds and other pollutants generated during the paint spraying process, thereby reducing the pollution caused by direct emissions of exhaust gas to the environment, and at the same time realizing the recycling of some gases to save energy.

[0003] However, existing paint spraying exhaust gas recirculation treatment systems are inadequate in terms of the recirculation distribution of treated gas. They are unable to reasonably balance the recirculation air volume required by the paint spraying processing area with the amount of gas discharged outward. Due to unreasonable air path design, the flow of paint mist-containing gas in the paint booth is obstructed, and it cannot smoothly enter the treatment stage according to the preset path. As a result, the paint mist cannot be removed in a timely and sufficient manner, which not only causes the paint mist concentration in the paint spraying processing area to be too high, affecting the coating quality, but also reduces the overall exhaust gas treatment efficiency. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a paint spraying exhaust gas recirculation treatment system, which can continuously treat and effectively remove paint mist, ensuring the stability and cleanliness of the system's gas circulation.

[0005] In a first aspect, this application provides a paint spraying exhaust gas recirculation and treatment system, comprising:

[0006] A spray booth includes a spray painting area, a circulating air area, and a recovery air area. The spray painting area is equipped with a first air outlet pipe and a second air outlet pipe. The circulating air area is equipped with a third air outlet pipe. The recovery air area is equipped with an air inlet pipe. The gas output from the first air outlet pipe and the second air outlet pipe is used to remove paint mist from the spray painting area.

[0007] A fresh air blower, wherein the air outlet of the fresh air blower is connected to the first air outlet pipe;

[0008] A spray tower, wherein the air inlet of the spray tower is connected to the air inlet pipe, and is used to dissolve impurities in the gas output from the air inlet pipe;

[0009] A dry filter, wherein the air inlet of the dry filter is connected to the air outlet of the spray tower, for further filtering of the gas output from the spray tower;

[0010] The main circulating fan has its air inlet connected to the air outlet of the dry filter, and its air outlet is connected to the second air outlet pipe and the third air outlet pipe respectively, so that the air volume of the second air outlet pipe is greater than that of the third air outlet pipe.

[0011] The first RTO fan has its inlet connected to the outlet of the main circulation fan, and is used to discharge a portion of the gas output from the outlet of the main circulation fan to the outside.

[0012] The paint spraying exhaust gas recirculation treatment system according to the first aspect of this application has at least the following beneficial effects: The recirculation system includes internal recirculation and external recirculation. In the internal recirculation, the second and third exhaust pipes blow gas into the paint booth. After flowing through the paint spraying processing area in the paint booth, the gas carries the generated paint mist into the spray tower. After the paint mist and other impurities are dissolved in the spray tower, the gas is further filtered by a dry filter to remove residual paint mist, making the gas pure. The purified gas is then transported back to the second and third exhaust pipes by the main recirculation fan, forming an internal recirculation loop. At the same time, the first RTO fan extracts and discharges part of the air volume in the internal recirculation, while the fresh air fan replenishes fresh gas to the paint spraying processing area through external recirculation to maintain the air volume balance in the system. This setup, through internal circulation, allows gas to continuously flow through the spray tower and dry filter, effectively removing paint mist generated in the painting area and ensuring the purity of the circulating gas. The design of the second exhaust duct having a larger air volume than the third exhaust duct drives the paint mist-laden gas to flow smoothly along a preset path, avoiding airflow obstruction that could affect the paint mist removal effect. The combination of internal and external circulation not only achieves effective removal of paint mist through continuous processing but also utilizes the exhaust gas from the first RTO fan and the fresh air fan to supplement fresh air, ensuring the stability and cleanliness of the system's gas circulation. This reduces the paint mist concentration in the painting area to ensure coating quality while improving overall processing efficiency and energy utilization efficiency.

[0013] According to some embodiments of the first aspect of this application, the paint booth is provided with a guide compression plate between the second air outlet pipe and the third air outlet pipe. The guide compression plate gradually moves towards the paint spraying area from top to bottom to increase the wind speed in the paint spraying area, so that the wind speed in the paint spraying area is greater than the wind speed in the circulating air zone.

[0014] According to some embodiments of the first aspect of this application, the lower end of the guide compression plate is provided with a height adjustment plate, which is used to further restrict the gas flow direction in the painting processing area according to the position of the product to be painted.

[0015] According to some embodiments of the first aspect of this application, the spray booth is equipped with a spray painting device, which is located in the spray painting processing area. The spray painting device includes a product clamp, which is located below the height adjustment plate and is used to hold the product to be sprayed.

[0016] According to some embodiments of the first aspect of this application, the air volume ratio of the second air outlet pipe and the third air outlet pipe is 6:4.

[0017] According to some embodiments of the first aspect of this application, the ratio between the total component of the main circulation fan output to the second air outlet pipe and the third air outlet pipe and the air volume output to the first RTO fan is 8:2.

[0018] According to some embodiments of the first aspect of this application, the air volume ratio of the first air outlet pipe and the second air outlet pipe is 2:6-3:6.

[0019] According to some embodiments of the first aspect of this application, the spray tower is provided with a plurality of filter layers, and an air venting baffle is provided between each filter layer, and a spraying device is provided on the lower surface of each air venting baffle.

[0020] According to some embodiments of the first aspect of this application, the air inlet of the spray tower is located at the bottommost filter layer, and its air outlet is located at the topmost filter layer. The number of spray arms provided by the spray device located at the bottom layer is greater than or equal to the number of spray arms provided by the spray device located at the top layer.

[0021] According to some embodiments of the first aspect of this application, the system further includes a mixing box, a second RTO blower, and an incinerator, wherein the air inlet of the mixing box is connected to the air outlet of the first RTO blower, the air outlet of the mixing box is connected to the air inlet of the second RTO blower, and the air inlet of the incinerator is connected to the air outlet of the second RTO blower.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0024] Figure 1 This is a schematic diagram of the structure of a paint spraying exhaust gas recirculation treatment system provided in some embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the structure of a spray booth provided in some embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the structure of a spray tower provided in some embodiments of this application.

[0027] The attached icons are numbered as follows:

[0028] Spray painting booth 100; Spray painting processing area 101; Circulating air zone 102; Recovered air zone 103; First air outlet duct 110; Second air outlet duct 120; Third air outlet duct 130; Air inlet duct 140; Guide compression plate 150; Height adjustment plate 160; Product clamp 170; Fresh air fan 200; Spray tower 300; Filter layer 310; Spray arm 320; Dry filter 400; Main circulating fan 500; First RTO fan 600; Mixing box 700; Second RTO fan 800; Incinerator 900. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0033] The paint spraying exhaust gas recycling system is mainly used to treat the exhaust gas containing paint mist and volatile organic compounds and other pollutants generated during the paint spraying process, thereby reducing the pollution caused by direct emissions of exhaust gas to the environment, and at the same time realizing the recycling of some gases to save energy.

[0034] However, existing paint spraying exhaust gas recirculation treatment systems are inadequate in terms of the recirculation distribution of treated gas. They are unable to reasonably balance the recirculation air volume required by the paint spraying processing area with the amount of gas discharged outward. Due to unreasonable air path design, the flow of paint mist-containing gas in the paint booth is obstructed, and it cannot smoothly enter the treatment stage according to the preset path. As a result, the paint mist cannot be removed in a timely and sufficient manner, which not only causes the paint mist concentration in the paint spraying processing area to be too high, affecting the coating quality, but also reduces the overall exhaust gas treatment efficiency.

[0035] Based on this, this application provides a paint spraying exhaust gas recycling system to solve the above-mentioned technical problems. The technical solutions provided by this application will be described in detail below.

[0036] Reference Figure 1 and Figure 2 This application provides a paint spraying exhaust gas recycling system, including: a paint booth 100, a fresh air blower 200, a spray tower 300, a dry filter 400, a main circulating fan 500, and a first RTO (Regenerative Thermal Oxidizer) fan 600. The paint booth 100 includes a paint spraying processing area 101, a circulating air zone 102, and a recovery air zone 103. The paint spraying processing area 101 is provided with a first exhaust pipe 110 and a second exhaust pipe 120. The circulating air zone 102 is provided with a third exhaust pipe 130, and the recovery air zone 103 is provided with an inlet pipe 140. The gas output from the first exhaust pipe 110 and the second exhaust pipe 120 is used to remove paint mist from the paint spraying processing area 101. The outlet of the fresh air blower 200 is connected to the first exhaust pipe 110. The inlet of the spray tower 300 is connected to the inlet pipe 140 for... The air inlet of the dry filter 400 is connected to the outlet of the spray tower 300 to further filter the gas output from the spray tower 300; the air inlet of the main circulating fan 500 is connected to the outlet of the dry filter 400, and its outlet is connected to the second outlet 120 and the third outlet 130 respectively, so that the air volume of the second outlet 120 is greater than that of the third outlet 130; the air inlet of the first RTO fan 600 is connected to the outlet of the main circulating fan 500 to discharge part of the gas output from the outlet of the main circulating fan 500.

[0037] This circulation system comprises internal and external circulation. In the internal circulation, the second and third outlet ducts 120 and 130 blow gas into the spray booth 100. Within the spray booth 100, the gas flows through the painting processing area 101, carrying the generated paint mist into the spray tower 300. The spray tower 300 dissolves the paint mist and other impurities, and the gas is further filtered by the dry filter 400 to remove residual paint mist, thus purifying the gas. The purified gas is then transported back to the second and third outlet ducts 120 and 130 by the main circulation fan 500, forming the internal circulation loop. Simultaneously, the first RTO fan 600 extracts and discharges a portion of the airflow from the internal circulation, while the fresh air fan 200 replenishes the painting processing area 101 with fresh gas through external circulation to maintain airflow balance within the system. This configuration, through internal circulation, ensures a continuous flow of gas through the spray tower 300 and the dry filter 400, effectively removing paint mist generated in the painting processing area 101 and ensuring the purity of the circulating gas. The design of the second exhaust duct 120, with a larger air volume than the third exhaust duct 130, drives the paint mist-laden gas to flow smoothly along a preset path, avoiding airflow obstruction that could affect the paint mist removal effect. The combination of internal and external circulation not only achieves effective paint mist removal through continuous processing but also utilizes the exhaust of some gas from the first RTO fan 600 and the replenishment of fresh air from the fresh air fan 200 to ensure the stability and cleanliness of the system's gas circulation. This reduces the paint mist concentration in the painting processing area 101, ensuring coating quality, while simultaneously improving overall processing efficiency and energy utilization efficiency.

[0038] Reference Figure 2 It is understandable that the paint booth 100 has a guide compression plate 150 between the second air outlet duct 120 and the third air outlet duct 130. The guide compression plate 150 gradually approaches the paint processing area 101 from top to bottom to increase the air velocity at the paint processing area 101, so that the air velocity at the paint processing area 101 is greater than the air velocity in the circulating air area 102. Through its inclined structure that gradually approaches the paint processing area 101 from top to bottom, it compresses the airflow channel between the paint processing area 101 and the circulating air area 102, making the airflow space on the paint processing area 101 side gradually narrow. According to the principles of fluid mechanics, under the same air volume, a reduction in the flow cross-section will increase the air velocity in the paint processing area 101, thus creating an airflow difference where the air velocity in the paint processing area 101 is greater than the air velocity in the circulating air area 102. By guiding the compression plate 150, the airflow driving force from the painting processing area 101 to the circulating air area 102 is enhanced, preventing paint mist-containing gas from stagnating in the painting processing area 101 and improving the smoothness and stability of airflow. Simultaneously, the higher wind speed can more efficiently remove paint mist generated during painting, reducing paint mist adhesion interference on the workpiece surface, further ensuring coating quality. Combined with the airflow distribution of the exhaust duct, this makes the overall airflow path more orderly and improves the efficiency of paint mist recovery and treatment.

[0039] Continue to refer to Figure 2It is understood that the lower end of the guide compression plate 150 is equipped with a height adjustment plate 160, which is used to further restrict the gas flow direction within the painting processing area 101 according to the position of the product to be painted. By adjusting its own height, it adapts to the specific position of the product to be painted, thereby flexibly changing the airflow channel state at the bottom of the painting processing area 101. When the product position is different, adjusting the height of the height adjustment plate 160 can specifically restrict the airflow direction, making the gas flow more precisely around the product, ensuring that the paint mist-containing gas can be effectively guided from the periphery of the product to the circulating air zone 102. This allows the height adjustment plate 160 to optimize the airflow path regardless of the height position of the product to be painted, avoiding localized paint mist retention caused by differences in product position, and ensuring efficient discharge of paint mist.

[0040] Continue to refer to Figure 2 It is understandable that the spray booth 100 is equipped with a spray painting device, which is located in the spray painting processing area 101. The spray painting device includes a product clamp 170, which is positioned below the height adjustment plate 160 and is used to hold the product to be sprayed. The product clamp 170 stabilizes the product, preventing uneven coating caused by product shaking during spraying and ensuring basic spraying accuracy. At the same time, the product is fixed in a suitable position below the height adjustment plate 160, allowing the height adjustment plate 160 to more directly control the airflow onto the product surface, ensuring that paint mist is carried away by the airflow in time and reducing excess paint mist adhesion on the product surface. In addition, the positional coordination between the clamp and the height adjustment plate 160 improves the adaptability to different products and the stability of the spraying process, further ensuring the consistency of coating quality.

[0041] Continue to refer to Figure 2 It is understood that the airflow ratio of the second air outlet duct 120 to the third air outlet duct 130 is 6:4. In one embodiment, if the airflow of the second air outlet duct 120 is 5760 m³ / h, then the airflow of the third air outlet duct 130 is 3840 m³ / h.

[0042] At this time, the air volume of the first outlet duct 110 is 2400 m³ / h, from which we can deduce that the air volume of the inlet duct 140210 is 12000 m³ / h. After being processed by the peripheral spray tower 300, dry filter 400, and main circulating fan 500, 9600 m³ / h will re-enter the second outlet duct 120 and the third outlet duct 130. The 6:4 ratio ensures that the painting processing area 101 has sufficient air volume to move the paint mist to the circulating air area 102, effectively preventing paint mist stagnation, while avoiding energy waste caused by excessive first outlet air volume or insufficient second outlet air volume affecting the airflow balance of the circulating air area 102. This ratio works synergistically with other airflow structures to make the overall airflow more stable and efficient, improving the paint mist recovery and treatment effect while taking into account the economic efficiency of system operation, and further ensuring the stability of painting quality.

[0043] Reference Figure 1 It is understandable that the ratio of the total output from the main circulation fan 500 to the second and third outlet ducts 120 to the output to the first RTO fan 600 is 8:2. 80% of the airflow is used for internal circulation, ensuring sufficient air is blown into the paint booth 100 through the second and third outlet ducts 120 and 130. This, in conjunction with the guide compression plate 150 and airflow distribution structure, maintains efficient airflow in the painting processing area 101, ensuring that paint mist is promptly carried away and enters the treatment stage. 20% of the airflow is discharged through the first RTO fan 600, preventing the long-term accumulation of trace impurities not thoroughly treated in the internal circulation and maintaining the purity of the circulating gas. This high proportion of internal circulation reduces the load on the fresh air fan 200 for supplementing fresh air, lowering energy consumption, while appropriate external discharge prevents residual impurities from affecting the treatment effect, achieving a balance between recycling and purified emissions. Meanwhile, the coordinated structure with the second air outlet duct 120 and the third air outlet duct 130 (6:4 air volume distribution) and the wind speed regulation of the guide compression plate 150 further enhances the stability and orderliness of the overall air path, ensuring efficient removal of paint mist, guaranteeing coating quality, and balancing the economy and processing efficiency of the system operation.

[0044] Reference Figure 2It is understandable that the air volume ratio of the first air outlet duct 110 and the second air outlet duct 120 is 2:6-3:6. Its function is to use the internal circulating air of the second air outlet duct 120 as the main component, combined with a suitable amount of fresh air from the first air outlet duct 110, to form a clear primary and secondary airflow coordination mechanism. The second air outlet duct 120, as the main channel for internal circulating air, provides a strong and continuous circulating airflow to the painting processing area 101 with a 6:1 air volume ratio. The clean air treated by the spray tower 300 and the dry filter 400 enhances the carrying and driving capacity of paint mist. The first air outlet duct 110, with a 2:3 air volume ratio, is used to supplement the air volume loss caused by the exhaust of the first RTO fan 600, maintain the system's air pressure balance, and simultaneously introduce a small amount of fresh air to prevent the accumulation of impurities caused by long-term closure of the internal circulating air. For example, the air volume from the second air outlet duct 120 is 5760 m3 / h, and the air volume from the first air outlet duct 110 is 2400 m3 / h. The appropriate amount of fresh air supplemented by the first air outlet duct 110 can not only avoid the decrease in the cleanliness of the internal circulating gas, but also meet the air pressure balance requirements, ensuring that the painting processing area 101 is always in a suitable airflow environment. While ensuring the stability of coating quality, it also optimizes the overall exhaust gas treatment efficiency.

[0045] Reference Figure 3 It is understandable that the spray tower 300 contains several filter layers 310, with ventilation baffles between each filter layer 310. Spray devices are installed on the lower surface of each ventilation baffle. The filter layers 310 can intercept and filter paint mist and impurities in the gas layer by layer, achieving step-by-step purification. The ventilation baffles not only separate the filter layers 310, preventing interference between pollutants at different levels, but also guide the gas to flow orderly through each filter layer 310, ensuring uniform airflow distribution. The spray devices on the lower surface of the ventilation baffles can spray the gas before it enters the next filtration layer, dissolving and settling some paint mist and soluble impurities, reducing the burden on subsequent filter layers 310, and simultaneously wetting the filter layers 310 to enhance their adsorption capacity. The synergistic effect of spraying and filtration can more thoroughly remove paint mist, significantly improving the cleanliness of the circulating gas. Combined with other purification processes within the system, this further ensures the coating quality of the painting processing area 101, while reducing equipment wear caused by residual impurities, and improving the overall stability and economy of the system.

[0046] Reference Figure 1It is understood that the paint spraying exhaust gas recirculation treatment system provided in this application also includes a mixing box 700, a second RTO fan 800, and an incinerator 900. The inlet of the mixing box 700 is connected to the outlet of the first RTO fan 600, the outlet of the mixing box 700 is connected to the inlet of the second RTO fan 800, and the inlet of the incinerator 900 is connected to the outlet of the second RTO fan 800. The purpose of the mixing box 700, the second RTO fan 800, and the incinerator 900 is to perform deep purification treatment on the gas discharged from the first RTO fan 600. By connecting to the outlet of the first RTO fan 600, the mixing box 700 can mix and homogenize the incoming gas, adjust the gas concentration and flow rate, and avoid the impact of gas composition fluctuations on the subsequent treatment effect. The second RTO fan 800 provides power for the gas flow, stably delivering the gas treated by the mixing box 700 to the incinerator 900, ensuring a continuous and orderly flow of gas into subsequent treatment stages. The incinerator 900, through high-temperature combustion, completely decomposes residual volatile organic compounds and other pollutants in the gas into harmless substances, achieving ultimate purification of the waste gas. This setup makes the entire paint spraying waste gas treatment process more comprehensive and compliant, further enhancing the system's environmental performance and applicability.

[0047] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A paint spraying exhaust gas recirculation treatment system, characterized in that, include: A spray booth includes a spray painting area, a circulating air area, and a recovery air area. The spray painting area is equipped with a first air outlet pipe and a second air outlet pipe. The circulating air area is equipped with a third air outlet pipe. The recovery air area is equipped with an air inlet pipe. The gas output from the first air outlet pipe and the second air outlet pipe is used to remove paint mist from the spray painting area. A fresh air blower, wherein the air outlet of the fresh air blower is connected to the first air outlet pipe; A spray tower, wherein the air inlet of the spray tower is connected to the air inlet pipe, and is used to dissolve impurities in the gas output from the air inlet pipe; A dry filter, wherein the air inlet of the dry filter is connected to the air outlet of the spray tower, for further filtering of the gas output from the spray tower; The main circulating fan has its air inlet connected to the air outlet of the dry filter, and its air outlet is connected to the second air outlet pipe and the third air outlet pipe respectively, so that the air volume of the second air outlet pipe is greater than that of the third air outlet pipe. The first RTO fan has its inlet connected to the outlet of the main circulation fan, and is used to discharge a portion of the gas output from the outlet of the main circulation fan to the outside.

2. The paint spraying exhaust gas recirculation treatment system according to claim 1, characterized in that, The spray booth has a guide compression plate between the second air outlet duct and the third air outlet duct. The guide compression plate gradually moves from top to bottom toward the spray painting processing area to increase the wind speed in the spray painting processing area so that the wind speed in the spray painting processing area is greater than the wind speed in the circulating air zone.

3. The paint spraying exhaust gas recirculation treatment system according to claim 2, characterized in that, The lower end of the guide compression plate is provided with a height adjustment plate, which is used to further restrict the gas flow direction in the painting processing area according to the position of the product to be painted.

4. The paint spraying exhaust gas recirculation treatment system according to claim 3, characterized in that, The spray booth is equipped with a spray painting device, which is located in the spray painting processing area. The spray painting device includes a product clamp, which is located below the height adjustment plate and is used to hold the product to be sprayed.

5. The paint spraying exhaust gas recirculation treatment system according to claim 1, characterized in that, The air volume ratio between the second air outlet duct and the third air outlet duct is 6:

4.

6. The paint spraying exhaust gas recirculation treatment system according to claim 1, characterized in that, The ratio of the total output of the main circulation fan to the second and third air outlet pipes to the air volume output to the first RTO fan is 8:

2.

7. The paint spraying exhaust gas recirculation treatment system according to claim 5, characterized in that, The air volume ratio between the first air outlet duct and the second air outlet duct is 2:6-3:

6.

8. The paint spraying exhaust gas recirculation treatment system according to claim 1, characterized in that, The spray tower is equipped with several filter layers, and each filter layer is separated by an air vent. A spray device is provided on the lower surface of each air vent.

9. The paint spraying exhaust gas recirculation treatment system according to claim 8, characterized in that, The air inlet of the spray tower is located at the bottommost filter layer, and its air outlet is located at the topmost filter layer. The number of spray arms in the lower spray device is greater than or equal to the number of spray arms in the upper spray device.

10. The paint spraying exhaust gas recirculation treatment system according to claim 1, characterized in that, It also includes a mixing box, a second RTO blower, and an incinerator. The air inlet of the mixing box is connected to the air outlet of the first RTO blower, the air outlet of the mixing box is connected to the air inlet of the second RTO blower, and the air inlet of the incinerator is connected to the air outlet of the second RTO blower.

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