Process and equipment for treating coating production exhaust gas

Abstract

The present application relates to chemical and environmental protection technical field, and aims to provide a kind of coating production waste gas treatment process, comprising the following steps: A, waste gas collection;B, pretreatment;C, pressurized enrichment;D, condensation separation;E, drying treatment;F, activated carbon adsorption.The present application can greatly improve the concentration of harmful substances in waste gas by pressurizing waste gas before activated carbon adsorption, which is convenient for subsequent condensation, drying, activated carbon adsorption and other operations.The pressurization multiple is controlled at about 3-5 times, which can avoid power waste caused by excessive pressurization while ensuring the efficiency of subsequent treatment.The waste gas compressor used in the present application adopts swing compression, which has the characteristics of compact structure, low power consumption and strong working continuity, and provides a new treatment method for waste gas treatment in coating production.

Description

Technical Field

[0001] This invention relates to the fields of chemical and environmental protection technology, specifically to a process and equipment for treating waste gas from paint production. Background Technology

[0002] Polyacrylate emulsion coatings are coatings based on polyacrylate emulsions. They possess advantages such as good weather resistance, water resistance, and acid and alkali resistance. They are easy to apply and can dry to form a film at room temperature. The coating film has high gloss, bright colors, and is non-toxic and pollution-free, classifying it as an environmentally friendly coating. It is widely used for the decoration and protection of building walls, wood, metal, and other surfaces. The production process of polyacrylate emulsion coatings includes emulsifying the raw materials, then polymerizing the emulsion with an initiator in a reactor; after the reaction, it undergoes sequential processing steps such as filtration, dispersion and stirring, sand milling, and secondary filtration to obtain the final product.

[0003] Currently, most existing polyacrylate emulsion coatings are water-based coatings using pure water as a solvent, resulting in relatively low overall hazard. However, due to the addition of initiators, surfactants, and other additives, some volatile organic solvents are inevitably introduced. Therefore, small amounts of harmful waste gases are still generated during the emulsification, polymerization, and dispersion processes. Existing technologies typically utilize activated carbon adsorption devices to physically adsorb these harmful gases before emission. However, because the overall content of harmful substances in these gases is low, but the emission volume is large, the adsorption efficiency through activated carbon is poor. Although some solutions enhance activated carbon adsorption efficiency by adding zeolite rotors before the activated carbon adsorption device, utilizing the adsorption and desorption of zeolite rotors to increase the concentration of harmful gases, the overall cost is high and the footprint is large, placing a heavy burden on enterprises. Summary of the Invention

[0004] The purpose of this invention is to provide a coating production waste gas treatment process and equipment that can improve the efficiency of waste gas purification and treatment with low power consumption compression.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is: a process for treating waste gas from paint production, comprising the following steps:

[0006] A. Waste gas collection: Collecting waste gas from the paint production process;

[0007] B. Pretreatment: Dry filtration of exhaust gas is performed using a bag filter to remove solid particulate matter from the exhaust gas;

[0008] C. Pressurization and concentration: The exhaust gas is compressed to increase the concentration of harmful gases in the exhaust gas; the pressure of the compressed exhaust gas is 0.3-0.5 MPa;

[0009] D. Condensation and separation: The pressurized waste gas is condensed, and the condensation temperature is controlled at 20-30℃ to remove high-boiling-point components from the waste gas.

[0010] E. Drying treatment: The exhaust gas is dried by silica gel adsorption, and the relative humidity (RH) of the exhaust gas is controlled below 40% after treatment.

[0011] F. Activated carbon adsorption: The dried waste gas is treated by adsorption using activated carbon.

[0012] Preferably, the waste gas treatment equipment includes a waste gas compressor, and a condenser, a silica gel drying tank, and an activated carbon adsorption tank arranged above the waste gas compressor and connected in sequence.

[0013] Preferably, the exhaust gas compressor includes a disc-shaped compression chamber and an exhaust gas storage chamber disposed above the compression chamber;

[0014] The compression chamber is symmetrically provided with two fan-shaped transition chambers, which are connected to the exhaust gas storage chamber at the top; the two transition chambers form a compression chamber; a compression inlet is provided on the outer wall of the compression chamber near the transition chamber, and a one-way valve that allows unidirectional flow from the outside to the inside is provided at the compression inlet; a compression outlet is provided on the side wall of the transition chamber adjacent to the compression chamber, and a pressure limiting valve that allows unidirectional flow from the compression chamber to the transition chamber is provided at the compression outlet;

[0015] A rotating compression paddle is located at the center of the compression chamber, and the rotating compression paddle reciprocates within the compression chamber under the drive of the drive mechanism.

[0016] Preferably, a main shaft is provided at the center of the compression chamber, and the main shaft is connected to the drive mechanism; the rotary compression paddle includes a bushing fixedly sleeved outside the main shaft, and a paddle body extending radially along the compression chamber.

[0017] Preferably, the drive mechanism includes an upper bevel gear and a lower bevel gear symmetrically arranged on the lower section of the main shaft, and also includes a drive bevel gear arranged on one side of the main shaft. The drive bevel gear is connected to the drive motor through a transmission shaft. The drive bevel gear is provided with a fan-shaped meshing section that can cooperate with the upper bevel gear and the lower bevel gear. The meshing section drives the main shaft to rotate in the forward or reverse direction by intermittently meshing with the upper bevel gear and the lower bevel gear, so as to drive the rotating compressor paddle to reciprocate within the compression chamber.

[0018] Preferably, an annular air intake chamber is provided outside the transition chamber and the compression chamber, and the compression chamber is connected to the air intake chamber through a compression air intake port; a main air intake port for exhaust gas to enter is provided on the side wall of the air intake chamber.

[0019] Preferably, a position control mechanism is further provided inside the compression chamber, the position control mechanism including a position locking component and a detection component;

[0020] The detection component is capable of detecting the position of the meshing section relative to the upper and lower bevel gears;

[0021] The locking component can be triggered to lock the position of the rotating compressor paddle when the meshing stroke of the meshing section with the upper and lower bevel gears ends; it can also be triggered to unlock the rotating compressor paddle when the meshing stroke of the meshing section with the upper and lower bevel gears begins.

[0022] Preferably, the detection assembly includes two detection sensors disposed on the upper and lower sides of the drive shaft, and two sensing elements disposed on the drive bevel gear and cooperating with the detection sensors; the sensing elements are respectively positioned opposite to the two ends of the meshing section.

[0023] Preferably, the locking assembly includes a plurality of locking holes disposed at the bottom of the rotating compressor blade, and an electrically controlled telescopic pin disposed on the bottom surface of the compression chamber and cooperating with the locking holes.

[0024] Preferably, the tooth body of the meshing section is composed of a tooth core and a rubber tooth sleeve, and the thickness of the rubber tooth sleeve gradually decreases from the front end to the rear end along the rotation direction of the meshing section.

[0025] The beneficial effects of this invention are mainly reflected in the following: by pressurizing the waste gas before activated carbon adsorption, the concentration of harmful substances in the waste gas can be greatly increased, facilitating subsequent operations such as condensation, drying, and activated carbon adsorption. Controlling the pressurization ratio to approximately 3-5 times ensures subsequent treatment efficiency while avoiding power waste caused by excessive pressurization. The waste gas compressor used in this invention employs a swing-type compression, featuring a compact and sophisticated structure, low power consumption, and strong continuous operation, providing a completely new treatment method for waste gas in paint production. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 for Figure 1 The structure shown is viewed from direction AA.

[0028] Figure 3 A schematic diagram of the drive mechanism and the rotating compressor blade;

[0029] Figure 4 This is a schematic diagram of the meshing section of the driving bevel gear;

[0030] Figure 5 This is a schematic diagram of the tooth core and rubber sleeve of the meshing section. Detailed Implementation

[0031] This invention discloses a waste gas treatment process for paint production, which can centrally and uniformly treat hazardous waste gases generated in various stages of paint production. Before activated carbon adsorption, pressurizing the waste gas can greatly increase the concentration of harmful substances in the waste gas, facilitating subsequent operations such as condensation, drying, and activated carbon adsorption. Simultaneously, controlling the pressurization ratio to approximately 3-5 times avoids energy waste caused by excessive pressurization while ensuring subsequent treatment efficiency.

[0032] Its overall process flow includes the following steps:

[0033] Waste gas collection: Based on the on-site equipment layout, waste gas in the paint production process is collected using gas collection hoods, pipelines, etc. The gas collection methods include, but are not limited to, top discharge collection, side discharge collection, direct collection inside the tank, etc. After the waste gas from each process equipment is collected, it is connected to the main pipe through branch pipes. The main pipe then guides the collected waste gas to the subsequent treatment equipment.

[0034] Pretreatment: Dry filtration of exhaust gas is carried out using bag filters, pleated dust collectors, etc., to remove solid particulate matter from the exhaust gas and prevent particulate matter from clogging.

[0035] Pressurization and concentration: By compressing the waste gas, the gas pressure is increased, thereby raising the concentration of harmful gases in the waste gas. The pressure of the compressed waste gas is generally 0.3-0.5 MPa. This invention significantly improves the efficiency of subsequent treatment processes by pressurizing the waste gas. Pressurization reduces the intermolecular distance between components in the waste gas, resulting in a relatively higher concentration. This makes it easier for gaseous pollutants to be converted into liquids for separation during the condensation and separation stage; during drying, moisture is more easily removed; and in the activated carbon adsorption stage, the increased pollutant concentration increases the contact probability between activated carbon and pollutants, significantly improving adsorption efficiency, ultimately achieving more efficient and thorough waste gas purification.

[0036] Condensation separation: The pressurized waste gas is condensed at a temperature controlled between 20-30℃ to remove high-boiling-point components such as benzene, toluene, xylene, and other benzene series compounds, whose boiling points are mostly around 80-140℃. At this temperature, some of these compounds will condense into liquid and be separated. Low-boiling-point organic solvents such as ethyl acetate and butanone can also be removed by condensation due to the lower temperature. In addition, some volatile organic compounds (VOCs) with larger molecular weights and relatively low boiling points can also be effectively removed within this condensation temperature range, thereby reducing the concentration of harmful gases in the waste gas.

[0037] Drying treatment: The waste gas is dried by silica gel adsorption, and the relative humidity (RH) of the waste gas after treatment is controlled below 40%. Before activated carbon adsorption of waste gas, silica gel adsorption and drying are used to control the relative humidity to ≤40%. This avoids moisture competing with pollutants for adsorption sites on activated carbon, thus improving adsorption efficiency. It also prevents moisture from causing activated carbon to clump and block pores, ensuring stable adsorption performance and guaranteeing the purification effect of waste gas.

[0038] Activated carbon adsorption: The dried waste gas is treated by adsorption with activated carbon. Usually, two sets of activated carbon adsorption equipment (activated carbon adsorption tanks) are set up, and the two alternately perform adsorption and desorption to ensure the continuity of waste gas treatment.

[0039] To achieve integration and miniaturization of waste gas treatment equipment, this invention discloses a waste gas treatment device for paint production. The device generally includes a waste gas compressor 1, and a condenser tank 2, a silica gel drying tank 3, and an activated carbon adsorption tank 4, which are sequentially connected and positioned above the compressor 1. Before entering the compressor 1, the waste gas undergoes dry filtration via a bag filter. This waste gas treatment device features high integration and a small footprint. In particular, its waste gas compressor employs a swing-type compression mechanism, resulting in a compact and efficient structure, low power consumption, and strong continuous operation, providing a novel treatment method for waste gas in paint production.

[0040] The waste gas treatment equipment of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] like Figure 1 As shown, the exhaust gas compressor 1 of the present invention includes a disc-shaped compression chamber 5 and an exhaust gas storage chamber 6 disposed above the compression chamber 5, which together achieve the compression and temporary storage of exhaust gas. Combined with... Figure 1 and 2 As shown, two fan-shaped transition chambers 7 are symmetrically arranged inside the compression chamber 5. The fan angle of the transition chambers 7 is generally between 35-60°. The transition chambers 7 are connected to the exhaust gas storage chamber 6 at the top. That is to say, the compressed exhaust gas first enters the transition chamber 7, and then enters the exhaust gas storage chamber 6 from the transition chamber 7 for storage. Usually, the connection is made by directly opening a through hole on the top surface of the transition chamber 7 to enter the exhaust gas storage chamber 6.

[0042] like Figure 2As shown, a compression chamber 8 is formed between the two transition chambers 7. A compression inlet 9 is provided on the outer wall of the compression chamber 8 near the transition chamber 7, and a one-way valve with unidirectional flow from the outside to the inside is provided at the compression inlet 9. Alternatively, an annular intake chamber 20 can be provided outside the transition chamber 7 and the compression chamber 8, with the compression chamber 8 connected to the intake chamber 20 via the compression inlet 9. A main intake port 21 for exhaust gas is provided on the side wall of the intake chamber 20. The annular intake chamber 20 can simultaneously meet the intake needs of multiple compression inlets 9; its annular layout is compact and eliminates the need for multiple branch pipes to connect the compression inlets 9.

[0043] A compression outlet 10 is provided on the side wall adjacent to the compression chamber 8 in the transition chamber 7. A pressure limiting valve is provided at the compression outlet 10, which allows unidirectional flow from the compression chamber 8 to the transition chamber 7. The pressure limiting pressure is set between 0.3-0.5 MPa. A rotating compression paddle is provided at the center of the compression chamber 5. The rotating compression paddle reciprocates within the compression chamber 8 under the drive of the drive mechanism.

[0044] During operation, the rotary compressor blade in the compression chamber 5 reciprocates within the compression chamber 8 under the drive of the drive mechanism. During this reciprocating motion, the side of the compression chamber 8 facing the direction of motion is in the compression work zone, while the other side is in the intake zone. When the rotary compressor blade swings towards the transition chamber 7, the exhaust gas in the compression work zone is compressed. When a preset pressure is reached, it is discharged through the compression outlet 10 and enters the transition chamber 7. At this time, the uncompressed exhaust gas enters the intake zone of the compression chamber 8 through the compression inlet 9. When the rotary compressor blade swings in the opposite direction, the intake zone and the compression work zone are reversed. This oscillating compression method has a compact structure and achieves effective compression of exhaust gas within each oscillation stroke.

[0045] The rotary compressor propeller is specifically installed using a bushing type mounting, combined with... Figure 2 and 3 As shown, a main shaft 11 is centrally located in the compression chamber 5, and the main shaft 11 is connected to the drive mechanism. The rotating compressor paddle includes a bushing 12 fixedly fitted outside the main shaft 11, and a paddle body 13 extending radially along the compression chamber 5. During rotation, the main shaft 11 drives the bushing 12 to reciprocate around the center of the main shaft 11, which in turn drives the paddle body 13 to oscillate, thereby compressing the air. Considering the sealing issue between the paddle body 13 and the compression chamber 8, a rubber sleeve is generally required on the contact surface between the paddle body 13 and the wall of the compression chamber 8.

[0046] When driving the main shaft 11 to reciprocate, a better approach of the present invention is as follows: Figure 3As shown, the drive mechanism includes an upper bevel gear 14 and a lower bevel gear 15 symmetrically arranged on the lower section of the main shaft 11, and also includes a drive bevel gear 16 arranged on one side of the main shaft 11. The drive bevel gear 16 is connected to the drive motor 18 via a transmission shaft 17. Figure 4 As shown, the driving bevel gear 16 is provided with a fan-shaped meshing section 19 that can engage with the upper bevel gear 14 and the lower bevel gear 15. The length of the meshing section 19 is consistent with the compression stroke. The meshing section 19 drives the main shaft 11 to rotate in the forward or reverse direction through intermittent meshing with the upper bevel gear 14 and the lower bevel gear 15, thereby driving the rotating compressor paddle to reciprocate within the compression chamber 8. During operation, the drive motor 18 drives the driving bevel gear 16 to rotate through the transmission shaft 17. When the driving bevel gear 16 rotates to the point where the meshing section 19 meshes with the upper bevel gear 14, it drives the main shaft 11 to rotate through the upper bevel gear 14; when the driving bevel gear 16 rotates to the point where the meshing section 19 meshes with the lower bevel gear 15, it drives the main shaft 11 to rotate through the lower bevel gear 15; ultimately, the reciprocating rotation drive of the main shaft 11 is achieved.

[0047] In practical applications, in order to ensure the precise fit of the upper bevel gear 14, the lower bevel gear 15 and the driving bevel gear 16, the relevant parameters of each gear and the meshing section 19 should be accurately calculated to ensure the accuracy of their fit.

[0048] Meanwhile, considering that during the compression of exhaust gas by the rotary compressor, the reaction force is relatively small in the initial stroke due to the ease of compression, while in the later stroke, the increased exhaust gas pressure results in a relatively larger reaction force during further compression; that is, in the initial stroke, when the meshing section 19 first engages with the upper and lower bevel gears, the primary requirement is stable contact, thus lowering the rigidity requirement for the inter-tooth meshing; while the later stroke demands higher rigidity. Therefore, as... Figure 5 As shown, a preferred embodiment of the present invention is that the tooth body of the meshing section 19 is composed of a tooth core 26 and a rubber tooth sleeve 27, and the thickness of the rubber tooth sleeve 27 gradually decreases from the front end to the rear end along the rotation direction of the meshing section 19, and may even be omitted at the rear end. In the early stage of the compression stroke, the thicker rubber tooth sleeve 27 and the relatively smaller tooth core 26 can reduce the tooth collision between the meshing section 19 and the upper and lower bevel gears in the initial stage of meshing, and undertake more of the guiding meshing function to prevent tooth breakage; while in the later stage of the stroke, as the reaction force is greater, more rigid meshing is required, and at this time the larger tooth core 26 can ensure the integrity and stability of power transmission.

[0049] In addition, due to the large reaction force at the end of the compression stroke, to prevent the main shaft 11 from rebounding due to the reaction force after the meshing section 19 disengages from the upper and lower bevel gears, a better approach of the present invention is to further provide a position control mechanism within the compression chamber 8. This position control mechanism includes a position locking component and a detection component. The detection component can detect the position of the meshing section 19 relative to the upper bevel gear 14 and the lower bevel gear 15. The locking component can be triggered to lock the position of the rotating compressor paddle at the end of the meshing stroke of the meshing section 19 with the upper and lower bevel gears 14 and 15. Alternatively, it can be triggered to unlock the rotating compressor paddle when the meshing stroke of the meshing section 19 with the upper and lower bevel gears 14 and 15 begins.

[0050] The commonly used detection components include two detection sensors 22 disposed on the upper and lower sides of the drive shaft 17, and two sensing elements 23 disposed on the drive bevel gear 16 and cooperating with the detection sensors 22. The sensing elements 23 are respectively positioned opposite to the two ends of the meshing section 19. The detection sensors 22 and the sensing elements 23 use proximity sensing or de-sensing. When the sensing element 23 rotates to the position of the detection sensor 22, the head and tail positions of the meshing section 19 can be detected, which can then be used in conjunction with the control locking component to perform the action.

[0051] The locking assembly can have various structural forms. For example, it can use magnetic adsorption for locking, with a permanent magnet adsorbent on the rotating compressor blade and an electromagnetic adsorbent at a corresponding position in the compression chamber 8. Locking is achieved by the electromagnetic adsorbent attracting the permanent magnet adsorbent. Alternatively, as shown in the figure, it can include several locking holes 24 at the bottom of the rotor body 13 of the rotating compressor blade, and electrically controlled telescopic pins 25 corresponding to the bottom surface of the compression chamber 5, which cooperate with the locking holes 24. Locking is achieved by the electrically controlled telescopic pins 25 extending into the locking holes 24, or alternatively, locking holes 24 can be omitted, and the electrically controlled telescopic pins 25 can be used to block the back side of the rotating compressor blade.

Claims

1. A process for treating waste gas from paint production, comprising the following steps: A. Waste gas collection: Collecting waste gas from the paint production process; B. Pretreatment: Dry filtration of exhaust gas is performed using a bag filter to remove solid particulate matter from the exhaust gas; C. Pressurization and concentration: The exhaust gas is compressed to increase the concentration of harmful gases in the exhaust gas; the pressure of the compressed exhaust gas is 0.3-0.5 MPa; D. Condensation and separation: The pressurized waste gas is condensed, and the condensation temperature is controlled at 20-30℃ to remove high-boiling-point components from the waste gas. E. Drying treatment: The exhaust gas is dried by silica gel adsorption, and the relative humidity (RH) of the exhaust gas is controlled below 40% after treatment. F. Activated carbon adsorption: The dried waste gas is treated by adsorption using activated carbon; The processing equipment used in the process includes: The exhaust gas compressor (1), and the condenser (2), silica gel drying tank (3) and activated carbon adsorption tank (4) connected in sequence above the exhaust gas compressor (1); The exhaust gas compressor (1) includes a disc-shaped compression chamber (5) and an exhaust gas storage chamber (6) disposed above the compression chamber (5). The compression chamber (5) is symmetrically provided with two fan-shaped transition chambers (7), which are connected to the exhaust gas storage chamber (6) at the top; the two transition chambers (7) form a compression chamber (8); a compression inlet (9) is provided on the outer wall of the compression chamber (8) near the transition chamber (7), and a one-way valve that flows unidirectionally from the outside to the inside is provided at the compression inlet (9); a compression outlet (10) is provided on the side wall of the transition chamber (7) adjacent to the compression chamber (8), and a pressure limiting valve that flows unidirectionally from the compression chamber (8) to the transition chamber (7) is provided at the compression outlet (10); A rotating compression paddle is provided at the center of the compression chamber (5), and the rotating compression paddle swings back and forth in the compression chamber (8) under the drive of the drive mechanism. During operation, the rotating compressor blade in the compression chamber (5) swings back and forth in the compression chamber (8) under the drive of the drive mechanism. During its swing, the compression chamber (8) facing the direction of its movement is in the compression working zone, while the other side is in the air intake zone. When the rotating compressor blade swings towards the transition chamber (7) on one side, the exhaust gas in the compression working zone is compressed. When the preset pressure is reached, it can be discharged through the compression outlet (10) and enter the transition chamber (7). At this time, the exhaust gas that has not been compressed enters the air intake zone of the compression chamber (8) through the compression inlet (9) in the air intake zone. When the rotating compressor blade swings in the opposite direction, the air intake zone and the compression working zone are switched. The compression chamber (5) is provided with a main shaft (11) at its center, and the main shaft (11) is connected to the drive mechanism; the rotating compression paddle includes a bushing (12) fixedly sleeved outside the main shaft (11), and a paddle body (13) extending radially along the compression chamber (5). The drive mechanism includes an upper bevel gear (14) and a lower bevel gear (15) symmetrically arranged on the lower section of the main shaft (11), and also includes a drive bevel gear (16) arranged on one side of the main shaft (11). The drive bevel gear (16) is connected to the drive motor (18) through a transmission shaft (17). The drive bevel gear (16) is provided with a fan-shaped meshing section (19) that can cooperate with the upper bevel gear (14) and the lower bevel gear (15). The meshing section (19) drives the main shaft (11) to rotate in the forward or reverse direction through intermittent meshing with the upper bevel gear (14) and the lower bevel gear (15), so as to drive the rotating compressor paddle to oscillate back and forth in the compression chamber (8). An annular air intake chamber (20) is provided outside the transition chamber (7) and the compression chamber (8). The compression chamber (8) is connected to the air intake chamber (20) through the compression air intake port (9). A main air intake port (21) for waste gas to enter is provided on the side wall of the air intake chamber (20). The compression chamber (8) is also provided with a position control mechanism, which includes a position locking component and a detection component; The detection component is capable of detecting the position of the meshing section (19) relative to the upper bevel gear (14) and the lower bevel gear (15); The locking component can be triggered to lock the position of the rotating compressor blade when the meshing stroke of the meshing section (19) with the upper bevel gear (14) and the lower bevel gear (15) ends; it can also be triggered to unlock the rotating compressor blade when the meshing stroke of the meshing section (19) with the upper bevel gear (14) and the lower bevel gear (15) begins. The detection assembly includes two detection sensors (22) disposed on the upper and lower sides of the transmission shaft (17), and two sensors (23) disposed on the drive bevel gear (16) and cooperating with the detection sensors (22); the sensors (23) are respectively positioned opposite to the two ends of the meshing section (19); The locking assembly includes a plurality of locking holes (24) provided at the bottom of the blade (13) of the rotating compressor blade, and an electrically controlled telescopic pin (25) provided on the bottom surface of the compression chamber (5) and cooperating with the locking holes (24). The teeth of the meshing section (19) are composed of a tooth core (26) and a rubber tooth sleeve (27), and the thickness of the rubber tooth sleeve (27) gradually decreases from the front end to the rear end along the rotation direction of the meshing section (19). In the early part of the compression stroke, the thicker rubber tooth sleeve (27) and the relatively smaller tooth core (26) can reduce the tooth collision between the meshing section (19) and the upper and lower bevel gears in the early stage of meshing, and undertake more of the guiding meshing function to prevent tooth breakage. In the later part of the stroke, as the reaction force is greater, more rigid meshing is required. At this time, the larger tooth core (26) can ensure the integrity and stability of power transmission.

2. A coating production waste gas treatment device using the process described in claim 1, characterized in that: It includes an exhaust gas compressor (1), and a condenser (2), a silica gel drying tank (3) and an activated carbon adsorption tank (4) arranged above the exhaust gas compressor (1) and connected in sequence. The exhaust gas compressor (1) includes a disc-shaped compression chamber (5) and an exhaust gas storage chamber (6) disposed above the compression chamber (5). The compression chamber (5) is symmetrically provided with two fan-shaped transition chambers (7), which are connected to the exhaust gas storage chamber (6) at the top; the two transition chambers (7) form a compression chamber (8); a compression inlet (9) is provided on the outer wall of the compression chamber (8) near the transition chamber (7), and a one-way valve that flows unidirectionally from the outside to the inside is provided at the compression inlet (9); a compression outlet (10) is provided on the side wall of the transition chamber (7) adjacent to the compression chamber (8), and a pressure limiting valve that flows unidirectionally from the compression chamber (8) to the transition chamber (7) is provided at the compression outlet (10); A rotating compression paddle is provided at the center of the compression chamber (5), and the rotating compression paddle swings back and forth in the compression chamber (8) under the drive of the drive mechanism. During operation, the rotating compressor blade in the compression chamber (5) swings back and forth in the compression chamber (8) under the drive of the drive mechanism. During its swing, the compression chamber (8) facing the direction of its movement is in the compression working zone, while the other side is in the air intake zone. When the rotating compressor blade swings towards the transition chamber (7) on one side, the exhaust gas in the compression working zone is compressed. When the preset pressure is reached, it can be discharged through the compression outlet (10) and enter the transition chamber (7). At this time, the exhaust gas that has not been compressed enters the air intake zone of the compression chamber (8) through the compression inlet (9) in the air intake zone. When the rotating compressor blade swings in the opposite direction, the air intake zone and the compression working zone are switched. The compression chamber (5) is provided with a main shaft (11) at its center, and the main shaft (11) is connected to the drive mechanism; the rotating compression paddle includes a bushing (12) fixedly sleeved outside the main shaft (11), and a paddle body (13) extending radially along the compression chamber (5). The drive mechanism includes an upper bevel gear (14) and a lower bevel gear (15) symmetrically arranged on the lower section of the main shaft (11), and also includes a drive bevel gear (16) arranged on one side of the main shaft (11). The drive bevel gear (16) is connected to the drive motor (18) through a transmission shaft (17). The drive bevel gear (16) is provided with a fan-shaped meshing section (19) that can cooperate with the upper bevel gear (14) and the lower bevel gear (15). The meshing section (19) drives the main shaft (11) to rotate in the forward or reverse direction through intermittent meshing with the upper bevel gear (14) and the lower bevel gear (15), so as to drive the rotating compressor paddle to oscillate back and forth in the compression chamber (8). An annular air intake chamber (20) is provided outside the transition chamber (7) and the compression chamber (8). The compression chamber (8) is connected to the air intake chamber (20) through the compression air intake port (9). A main air intake port (21) for waste gas to enter is provided on the side wall of the air intake chamber (20). The compression chamber (8) is also provided with a position control mechanism, which includes a position locking component and a detection component; The detection component is capable of detecting the position of the meshing section (19) relative to the upper bevel gear (14) and the lower bevel gear (15); The locking component can be triggered to lock the position of the rotating compressor blade when the meshing stroke of the meshing section (19) with the upper bevel gear (14) and the lower bevel gear (15) ends; it can also be triggered to unlock the rotating compressor blade when the meshing stroke of the meshing section (19) with the upper bevel gear (14) and the lower bevel gear (15) begins. The detection assembly includes two detection sensors (22) disposed on the upper and lower sides of the transmission shaft (17), and two sensors (23) disposed on the drive bevel gear (16) and cooperating with the detection sensors (22); the sensors (23) are respectively positioned opposite to the two ends of the meshing section (19); The locking assembly includes a plurality of locking holes (24) provided at the bottom of the blade (13) of the rotating compressor blade, and an electrically controlled telescopic pin (25) provided on the bottom surface of the compression chamber (5) and cooperating with the locking holes (24). The teeth of the meshing section (19) are composed of a tooth core (26) and a rubber tooth sleeve (27), and the thickness of the rubber tooth sleeve (27) gradually decreases from the front end to the rear end along the rotation direction of the meshing section (19). In the early part of the compression stroke, the thicker rubber tooth sleeve (27) and the relatively smaller tooth core (26) can reduce the tooth collision between the meshing section (19) and the upper and lower bevel gears in the early stage of meshing, and undertake more of the guiding meshing function to prevent tooth breakage. In the later part of the stroke, as the reaction force is greater, more rigid meshing is required. At this time, the larger tooth core (26) can ensure the integrity and stability of power transmission.

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