Paint mist treatment system for polishing primer chamber

Abstract

The invention belongs to the technical field of paint spraying waste gas treatment equipment, and particularly relates to a polishing primer chamber paint mist treatment system capable of improving fine paint mist trapping efficiency, which comprises a box type glass fiber filter, a bag type dust collector, an activated carbon adsorption assembly and a desorption catalytic oxidation unit. Paint spraying waste gas is firstly subjected to inertia retardation of a glass fiber structure and fiber trapping to achieve paint mist pre-filtration, and then enters a bag type dust collector to be subjected to deep fine filtration; the follow-up VOC airflow is guided into the activated carbon adsorption unit to be concentrated and adsorbed. An adsorption air path provided with an air inlet valve and a desorption air path provided with an air outlet valve are interlocked and switched, VOC in activated carbon is desorbed and transferred to a desorption pipeline in a hot air desorption mode, waste gas subjected to cold supplementing and air mixing adjustment finally enters a catalytic bed, catalytic oxidation is completed at the low temperature, reaction conditions are maintained through a combustor, and purified gas is discharged after reaching the standard through a chimney. The device has the advantages of high paint mist trapping efficiency, high activated carbon adsorption utilization rate, low catalytic oxidation energy consumption and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of paint spray exhaust treatment equipment, and particularly relates to a polishing primer chamber paint mist treatment system for improving fine paint mist capturing efficiency. BACKGROUND

[0002] The polishing primer chamber, also known as a primer polishing spray booth, is a comprehensive closed operation space for polishing, cleaning and re-spraying the surface of a primer layer in a coating production line. It is usually located between primer spraying and topcoat spraying, and is used to eliminate surface defects such as orange peel, dust spots and bubbles after the primer is cured, and to re-spray repair primer or a transition layer after polishing to ensure the adhesion of the topcoat and the flatness of the coating.

[0003] The polishing spray booth processes dust and paint mist generated during polishing and spraying through dust removal (generally using a bag dust collector) and a paint mist treatment system. The paint mist treatment system is the core device for purifying exhaust in the primer spray booth, and its main task is to capture, separate, filter and purify paint mist particles and volatile organic compounds (VOC) generated during spraying, and to ensure stable air circulation inside the spray booth and meet emission standards. Primer mist particles can easily diffuse with the airflow during spraying. If the paint mist is not captured in time, it will re-deposit on the workpiece surface, causing defects such as orange peel, particles, pitting and loss of gloss, which can lead to a decrease in the adhesion of the topcoat. In addition, primer usually contains organic solvents, resins and pigment particles, which form a mixed gas of VOC and particulate dust after atomization. If not properly treated, it can cause inhalation poisoning, skin irritation and explosion hazards, and long-term accumulation can also cause fires. The paint mist treatment system determines the cleanliness of the air inside the spray booth, the health and safety of operators, the yield of finished paint and the ability to meet environmental standards. It is a key link in the quality control of primer spraying and the management of environmental emissions.

[0004] Although the existing paint mist treatment system has been maturely applied for many years, it still has structural defects in efficiency, energy consumption, maintenance, environmental standards and safety, such as limited capturing efficiency, insufficient treatment of fine paint mist (<5 μm), high system energy consumption and large airflow resistance. SUMMARY

[0005] In view of the above deficiencies of the prior art, the problem to be solved by the present application is the limited capturing efficiency of the existing polishing primer chamber paint mist treatment system, high system energy consumption and large airflow resistance. The purpose of the present application is to provide a polishing primer chamber paint mist treatment system that improves the separation efficiency of dust and fine paint mist through a multi-stage filtration structure and a double-channel exhaust design, and realizes efficient purification of organic waste gas and energy-saving operation through an activated carbon adsorption concentration and online desorption catalytic combustion device.

[0006] In order to achieve the above object, the application adopts the following technical scheme: a paint mist treatment system for a polishing primer chamber, comprising a box-type glass fiber filter, a bag-type dust collector, an activated carbon adsorption assembly, a desorption mechanism,

[0007] The box-type glass fiber filter is provided with glass fiber paint mist filter cotton in a multi-layer overlapping structure and is installed in a pulling manner,

[0008] The bag-type dust collector is provided with oil-resistant filter bags, at least two chambers and a dust hopper,

[0009] The activated carbon adsorption assembly comprises an activated carbon tank filled with a honeycomb activated carbon module inside,

[0010] The desorption mechanism comprises a desorption pipeline assembly, a catalytic bed and a burner, the desorption pipeline assembly comprises a cold air supplementing fan, a desorption air inlet pipe, a desorption air outlet pipe, a desorption return air pipe, a hot air inlet pipe, a waste gas inlet pipe, a waste gas branch pipe, a fire arrestor and an emptying pipe, the desorption air inlet pipe and the desorption air outlet pipe are connected with the activated carbon tank, the desorption air inlet pipe is connected with the desorption return air pipe, the emptying pipe and the cold air supplementing fan, the hot air inlet pipe is connected between the catalytic bed and the burner, the catalytic bed is further connected with the desorption return air pipe and the waste gas inlet pipe, the waste gas branch pipe is connected between the waste gas inlet pipe and the emptying pipe, and the fire arrestor is arranged on the waste gas inlet pipe and the desorption return air pipe to prevent flame propagation,

[0011] The cold air supplementing fan is used to adjust the temperature of the desorption heated gas to prevent overhigh temperature, the desorption air inlet pipe is used to deliver hot air to the adsorption area, the desorption air outlet pipe is used to collect high-concentration VOC gas after desorption, the desorption return air pipe is used to return part of high-temperature gas to improve the heat efficiency of the system, the hot air inlet pipe is used to input hot air generated by the catalytic bed or provided by the burner, the waste gas inlet pipe and the waste gas branch pipe are used to collect VOC gas streams from different pipelines, and the emptying pipe is used for emergency discharge or fault pressure relief.

[0012] According to another embodiment of the application or any of the foregoing embodiments, the bag-type dust collector is provided with a pulse blowing pipe, the paint mist fine particles and dust layer attached to the surface of the filter bag are stripped by the high-speed compressed air instantaneously impacting the filter bag in the reverse direction, the air permeability of the filter bag is restored, and the operation resistance is reduced.

[0013] According to another embodiment of the application or any of the foregoing embodiments, the paint mist treatment system further comprises a maintenance staircase, the maintenance staircase is at the same height as the activated carbon tank, is provided with a crawling ladder and provides a safe, stable and ergonomic up-and-down channel for the operating personnel, so that the operating personnel can reach the high-position equipment such as the activated carbon adsorption tank, the desorption pipeline, the catalytic bed and the burner to perform maintenance, maintenance, filter material replacement or fault troubleshooting, thereby ensuring long-term stable and safe operation of the entire paint mist treatment system.

[0014] According to another embodiment of the application or any of the foregoing embodiments, the paint mist treatment system further comprises an exhaust ditch connected between the polishing primer chamber and the box-type glass fiber filter.

[0015] According to another embodiment of the application or any of the foregoing embodiments, the paint mist treatment system further comprises at least three activated carbon boxes suspended by a carbon box support, the activated carbon boxes being connected by an adsorption air inlet valve to an adsorption air inlet pipe for guiding the pretreated exhaust gas into the adsorption zone, and being connected by an adsorption air outlet valve to an adsorption air outlet pipe connected to the main exhaust system and a chimney connected by an adsorption exhaust fan.

[0016] According to another embodiment of the application or any of the foregoing embodiments, the catalytic bed is a honeycomb noble metal catalytic bed, which uses a ceramic honeycomb carrier as a matrix, the inner wall of which is coated with a transition layer of alumina and loaded with platinum and palladium noble metals, and the whole is formed into regular square holes, and cerium and lanthanum additives are added to enhance the redox capacity and thermal stability.

[0017] The beneficial effects of the present application are:

[0018] 1. The box-type glass fiber filter, the bag-type dust collector, and the activated carbon adsorption box of the present application are used for multi-stage dry filtration, the filter material of the box-type glass fiber filter is selected from glass fiber paint mist filter cotton, the filter cotton has a loose structure and a small increase in resistance after adhering paint mist, the material has a relatively large thickness in a free state, and thus a high filtration efficiency can be ensured, the bag-type dust collector is used in cooperation, and thus high-efficiency capture of paint mist particles below 5 μm can be realized, the total efficiency of the system is improved, and the paint mist capture efficiency is greatly improved.

[0019] 2. The VOC high-efficiency purification adsorption and concentration mechanism of the present application can make organic substances burn under the action of a catalyst to be decomposed into CO2 and H2O and release a large amount of heat after the activated carbon box is saturated, the gas temperature is further increased, the high-temperature gas is used for desorption of the activated carbon box, energy is saved, the VOC removal rate is greatly improved, long-term online regeneration is realized, and the cost of consumables is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a front view of a paint mist treatment system of a polishing primer chamber according to the present application;

[0021] Figure 2 FIG. 2 is a perspective view of a paint mist treatment system of a polishing primer chamber according to the present application;

[0022] Figure 3 FIG. 3 is a top view of a paint mist treatment system of a polishing primer chamber according to the present application;

[0023] Figure 4Figure 1 is a front view of the active carbon adsorption assembly and the maintenance staircase according to the present application;

[0024] Figure 5 Figure 2 is a perspective view of the active carbon adsorption assembly and the maintenance staircase according to the present application;

[0025] Figure 6 Figure 3 is a perspective view of the desorption mechanism according to the present application;

[0026] Figure 7 Figure 4 is a top view of the desorption mechanism according to the present application;

[0027] Figure 5 is a schematic view of the active carbon adsorption assembly according to the present application;

[0028] 100, box-type glass fiber filter;

[0029] 200, bag-type dust collector; 201, pulse blowing pipe;

[0030] 300, active carbon adsorption assembly; 301, adsorption air inlet pipe; 302, active carbon box; 303, carbon box support; 304, adsorption air outlet pipe; 305, adsorption exhaust fan; 306, adsorption air inlet valve; 307, adsorption air outlet valve;

[0031] 400, desorption pipeline assembly; 401, cold air supplementing fan; 402, desorption air inlet pipe; 403, desorption air outlet pipe; 404, desorption return air pipe; 405, hot air inlet pipe; 406, waste gas inlet pipe; 407, waste gas branch pipe; 408, fire damper; 409, emptying pipe;

[0032] 500, maintenance staircase; 501, ladder;

[0033] 600, catalytic bed;

[0034] 700, combustor;

[0035] 800, chimney. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] As Figure 1 , 2As shown, a kind of polishing primer chamber paint mist treatment system, including box type glass fiber filter 100, bag filter 200, activated carbon adsorption component 300, desorption mechanism. Box type glass fiber filter 100 is installed with glass fiber paint mist filter cotton, and the glass fiber paint mist filter cotton is in the form of multiple layers of overlapping structure, and is installed in the form of pull-out. Bag filter 200 uses oil-resistant filter bag, and at least has two chambers and ash bucket. Bag filter 200 is provided with pulse blowing pipe 201, the air permeability of filter bag is restored by the strong peeling of paint mist fine particles and dust layer attached to the surface of filter bag by the instantaneous reverse impact of high-speed compressed air, and the running resistance is reduced.

[0038] As shown in Figure 3 、 4 , 5, activated carbon adsorption component 300 includes activated carbon tank 302, and the inside of activated carbon tank 302 is filled with honeycomb activated carbon module. Activated carbon tank 302 has at least three, and is suspended by carbon tank support 303, and activated carbon tank 302 is connected with adsorption air inlet pipe 301 by adsorption air inlet valve 306, and adsorption air inlet pipe 301 is used to guide the pre-processed waste gas into the adsorption zone; activated carbon tank 302 is connected with adsorption air outlet pipe 304 by adsorption air outlet valve 307, and adsorption air outlet pipe 304 is connected to the main exhaust system and is connected to chimney 800 by adsorption exhaust fan 305. It also includes maintenance staircase 500, and maintenance staircase 500 is the same height as activated carbon tank 302, and is provided with ladder 501, to provide safe, stable and ergonomic up-and-down passage for operating personnel, so that they can reach high-level equipment such as activated carbon adsorption tank, desorption pipeline, catalytic bed 600 and burner 700 to carry out maintenance, maintenance, filter material replacement or fault diagnosis, so as to ensure long-term stable and safe operation of the entire paint mist treatment system. It also includes exhaust ditch, which is connected between polishing primer chamber and box type glass fiber filter 100.

[0039] As shown in Figure 6 、 7 , desorption mechanism includes desorption pipeline component 400, catalytic bed 600 and burner 700, desorption pipeline component 400 includes cold air supplementing fan 401, desorption air inlet pipe 402, desorption air outlet pipe 403, desorption return air pipe 404, hot air inlet pipe 405, waste gas inlet pipe 406, waste gas branch pipe 407, fire barrier 408 and emptying pipe 409, desorption air inlet pipe 402 and desorption air outlet pipe 403 are connected with activated carbon tank 302, desorption air inlet pipe 402 is connected with desorption return air pipe 404, emptying pipe 409 and cold air supplementing fan 401, hot air inlet pipe 405 is connected between catalytic bed 600 and burner 700, catalytic bed 600 is also connected with desorption return air pipe 404 and waste gas inlet pipe 406, waste gas branch pipe 407 is connected between waste gas inlet pipe 406 and emptying pipe 409, and fire barrier 408 is arranged on waste gas inlet pipe 406 and desorption return air pipe 404 to block the spread of flame,

[0040] As shown in Figure 6、 7 As shown in the figure, the cold air fan 401 is used to adjust the temperature of the desorption heating gas to prevent it from being too high; the desorption air inlet pipe 402 delivers hot air to the adsorption zone; the desorption air outlet pipe 403 collects the high-concentration VOC gas after desorption; the desorption return air pipe 404 returns part of the high-temperature gas to improve the thermal efficiency of the system; the hot air inlet pipe 405 is used to input hot air generated by the catalytic bed 600 or provided by the burner 700; the exhaust gas inlet pipe 406 and the exhaust gas branch pipe 407 are used to collect VOC gas streams from different pipelines; and the emptying pipe 409 is used for emergency discharge or fault pressure relief.

[0041] As shown in the figure, Figure 3 、 6 As shown in the figure, the catalytic bed 600 is a honeycomb noble metal catalytic bed 600, which adopts a ceramic honeycomb carrier as a matrix, the inner wall is coated with a transition layer such as alumina and loaded with platinum and palladium noble metals, and the whole is formed into a regular square hole, and cerium and lanthanum additives are added to enhance the redox capacity and thermal stability.

[0042] When polishing, the polishing switch is turned on, outdoor fresh air enters the room body operation space after being filtered to remove dust, and the airflow forms an air curtain around the workpiece from front to back, with an end face wind speed greater than 0.18 m / s, which carries away the dust generated during polishing, thereby improving the working environment. The dust is filtered by the air inlet, and is discharged after being purified and filtered by the bag filter in the rear section. When painting, the paint spraying switch is turned on, outdoor fresh air enters the room body operation space after being filtered to remove dust, and the airflow forms an air curtain around the workpiece from front to back, with an end face wind speed greater than 0.28 m / s, which carries away the oversprayed paint mist and volatile organic solvents during painting, thereby improving the working environment.

[0043] The oversprayed paint mist is filtered by the air inlet, and is discharged after being purified and filtered by the box-type glass fiber filter 100, the bag-type dust collector 200 and the activated carbon adsorption and concentration device in the rear section. After the gas enters the adsorption bed, the organic substances in the gas are adsorbed by the activated carbon and attached to the surface of the activated carbon, so that the gas is purified, and the purified gas is discharged to the atmosphere by the fan.

[0044] According to the actual situation, two sets of adsorption devices are designed. In the case that the paint spraying room is not working, desorption work is carried out.

[0045] The adsorption box is made of carbon steel and coated with paint. The honeycomb activated carbon (specification: 100x100x100) in each adsorption bed has a loading capacity of 1428.3 kg (3.174 m3x450 kg / m3), and a high-temperature detection device is provided. When the waste gas containing organic matter is subjected to the action of the fan and passes through the activated carbon adsorption layer (arranged in an orderly manner), the organic matter is intercepted in the activated carbon by the unique force of the activated carbon, and the clean gas is discharged. After a period of time, when the activated carbon reaches the saturation state, the adsorption is stopped, and at this time the organic matter has been concentrated in the activated carbon;

[0046] The activated carbon is selected from coal-based honeycomb activated carbon, and the main technical performance is as follows:

[0047] Table 1. Main parameter requirements of activated carbon

[0048] Serial number Main component Activated carbon 1 Specification 100 x 100 x 100 mm 2 Wall thickness 0.5-0.6 mm 3 Bulk density 450-550 kg / m 3 ]] 4 Specific surface area > 500 m 2 / g]] 5 Adsorption rate of carbon tetrachloride ≥30％ 6 Compressive strength Positive pressure > 0.8 MPa; negative pressure > 0.5 MPa 7 Adsorption rate 15 ± 5% (dynamically measured)

[0049] The adsorption box body shell is made of Q235 t=3 mm steel plate, and is continuously welded outside without bubbles, slag and other phenomena, and is overall beautiful;

[0050] Internal circulation pipeline: the internal circulation pipeline is made of t=1.2 mm galvanized steel plate, and is connected by folding and bayonet connection, which is overall beautiful, has good sealing performance, and the flange is connected by bolts;

[0051] The waste gas collection pipeline is connected by the buyer to the inlet flange of the seller's filter box; the main exhaust fan is selected from domestic high-quality products, and the specific requirements are as follows: the fan flow, pressure and other parameters meet the design requirements, and the performance is stable; the fan uses 9-26 high-pressure centrifugal fan, which can be used for a long time below 250-300°C, and is driven by a belt pulley; the fan flow, pressure and other parameters meet the design requirements, and the performance is stable.

[0052] The burner 700 is made of SUS304 t=2.0 mm stainless steel plate, and has good overall temperature resistance;

[0053] Chimney 800: The chimney 800 is made of t=1.2 mm galvanized steel plate; the height is more than 15 meters;

[0054] The control system controls the fan, burner 700, temperature, and electric valve in the system. When the temperature of the catalytic bed 600 is too high, the cold air supplement valve is opened to supplement fresh air to the catalytic bed 600 system, which can effectively control the temperature of the catalytic bed 600 and prevent the temperature of the catalytic bed 600 from being too high. In addition, the system also has a flame arrester 408 and a fireproof valve, which can effectively prevent flame backflow. When the desorption temperature of the activated carbon adsorption bed is too high, the valve is automatically opened to use the main fan to cool down.

[0055] Desorption gas flow: Close the adsorption fan and the inlet and outlet valves of the saturated adsorption tank, start the desorption fan to desorb the adsorption bed, the desorption gas is heated to about 300℃ by the burner 700, enters the activated carbon tank 302 to send the high-concentration organic waste gas into the catalytic bed 600, the organic matter is burned under the action of the catalyst and is decomposed into CO2 and H2O, and a large amount of heat is released, the gas temperature is further increased, the high-temperature gas enters the activated carbon tank 302 again, and the flue gas of the burner 700 enters the chimney 800 through the exhaust pipe 409. That is, the gas is divided into two parts: one part is directly exhausted; the other part enters the adsorption bed to desorb the activated carbon. When the desorption temperature is too high, the cooling air supply fan 401 can be started to cool, so that the desorption gas temperature is stabilized within a suitable range.

[0056] The working principle of the present application:

[0057] In the paint spraying stage of the grinding primer room, the waste gas is mainly composed of paint mist particles (5-50 μm) and a large amount of VOC. The airflow in the workshop enters the paint mist treatment system under the action of negative pressure, first enters the box-type glass fiber filtration unit. The glass fiber filter material is composed of three-dimensional interlaced fine fibers, and forms a dense inertial collision zone and a permeation adsorption zone inside. The paint mist particles collide with the fibers multiple times due to inertial deviation in the high-speed airflow, adhere to the surface of the fibers, and the viscous paint mist forms an “adhesion diffusion” effect in the deep part of the filter layer, so that the paint mist continuously migrates to the deep part of the filter core, thereby realizing efficient capture of large and medium particles and reducing the burden of the subsequent system.

[0058] The airflow after pre-filtering enters the bag-type filtration unit. The bag-type filtration has a larger filtration area, and its working mechanism is mainly based on fine powder interception, Brownian diffusion and screening effect. Smaller paint mist particles and paint spraying dust form a “dust initial layer” on the outer surface of the filter bag, thereby significantly improving the filtration efficiency; at the same time, the system realizes timed backflushing through the pulse blowing structure, so that the filter bag maintains a relatively low pressure loss and realizes continuous and stable operation. After this step, the particle removal rate has reached more than 95%, creating ideal conditions for the subsequent VOC adsorption.

[0059] The solid particles in the gas flowing out of the bag-type dust collector 200 are basically removed, and the pollutants in the waste gas are mainly VOC molecules, which enter the activated carbon adsorption assembly 300 at this time. The activated carbon tank 302 is filled with honeycomb carbon or columnar carbon with high specific surface area, and its microporous structure has a large number of micropores and mesopores, which produces physical adsorption effect on VOC molecules. Since the pore size of the activated carbon is much smaller than the free path of the VOC molecules, the VOC molecules are adsorbed by the Van der Waals force after entering the pore wall, forming a strong adsorption layer, so that the toluene, xylene, ester and other organic matters in the waste gas are firmly captured.

[0060] The adsorption assembly adopts a series structure of the air inlet side and the air outlet side. Through switching of the air inlet valve and the air outlet valve, separation of two working modes of paint spraying and desorption is realized. In the paint spraying mode, the adsorption fan uniformly sucks the waste gas into each carbon tank, so that the carbon layer is gradually saturated from bottom to top and from outside to inside. With the adsorption time advancing, the carbon layer presents a dynamic characteristic that the adsorption saturation front gradually advances. The system can be continuously operated by timely switching of the desorption mode.

[0061] Since the paint mist has been removed in the front stage, the load of the active carbon in the rear stage is significantly reduced, so that longer adsorption life can be ensured and the VOC capture rate is improved.

[0062] When the active carbon approaches the set saturation level, the desorption mode is entered through valve switching. The desorption system realizes desorption of VOC through heating and airflow scouring. First, the hot air is sent into the adsorption assembly through the desorption air inlet pipe 402, so that the VOC molecules adsorbed in the internal micropores of the active carbon obtain energy and are desorbed out by increasing the temperature of the carbon layer. The gas escapes from the high-temperature carbon layer inside and enters the desorption air outlet pipe 403 with the airflow, forming high-concentration VOC waste gas.

[0063] The system is provided with a cold air supplementing fan 401 for adjusting the temperature of the desorption air, so that the temperature of the desorption air reaches a suitable reaction temperature at the inlet of the catalytic bed 600. Part of the hot air is recycled through the desorption return air pipe 404, thereby reducing energy consumption. For the carbon layers at different positions in the carbon tank, the temperature will change in a gradient, and the VOC molecules are converted from the adsorbed state to the free state under the triple coupling action of negative pressure driving, thermal migration and gas scouring, and then are concentrated and transported to the rear-end catalytic oxidation device with the airflow.

[0064] The purified gas at the outlet of the catalytic bed 600 is discharged through the chimney 800, and the concentration reaches the requirements of the National Ambient Air Pollutant Comprehensive Discharge Standard. A flame arrester 408 is arranged on the desorption pipeline, which can prevent backflow of flame and ensure the operation safety of the carbon tank and the entire equipment. In addition, the emptying pipe 409 is used for emergency discharge or rapid pressure relief in case of equipment abnormality, so as to ensure that the system does not have the risk of overpressure or backfire.

[0065] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A sanding primer booth paint mist treatment system characterized by: The box type glass fiber filter (100), the bag type dust collector (200), the activated carbon adsorption assembly (300), the desorption mechanism, The box type glass fiber filter (100) is provided with glass fiber paint mist filter cotton in a multi-layer overlapping structure and is installed in a pulling type. The bag type dust collector (200) is provided with at least two chambers and a dust hopper. The activated carbon adsorption assembly (300) comprises an activated carbon box (302) filled with a honeycomb activated carbon module. The desorption mechanism comprises a desorption pipeline assembly (400), a catalytic bed (600) and a burner (700). The desorption pipeline assembly (400) comprises a cold air supplementing fan (401), a desorption air inlet pipe (402), a desorption air outlet pipe (403), a desorption return air pipe (404), a hot air inlet pipe (405), a waste gas inlet pipe (406), a waste gas branch pipe (407), a fire barrier (408) and an emptying pipe (409).

2. A finish primer booth paint mist treatment system as defined in claim 1, wherein: The desorption air inlet pipe (402) is connected with the desorption return air pipe (404), the emptying pipe (409) and the cold air supplementing fan (401).

3. A finish primer booth paint mist treatment system as defined in claim 1 wherein: The hot air inlet pipe (405) is connected between the catalytic bed (600) and the burner (700).

4. A finish primer booth paint mist treatment system as defined in claim 1, wherein: The waste gas inlet pipe (406) and the desorption return air pipe (404) are provided with the fire barrier (408) for preventing flame propagation. The cold air supplementing fan (401) is used for adjusting the temperature of the desorption heated gas to prevent overhigh temperature. The desorption air inlet pipe (402) is used for delivering hot air to the adsorption area. The desorption return air pipe (404) is used for returning part of high-temperature gas to improve the heat efficiency of the system. The hot air inlet pipe (405) is used for inputting hot air generated by the catalytic bed (600) or provided by the burner (700). The waste gas inlet pipe (406) and the waste gas branch pipe (407) are used for collecting VOC gas streams from different pipelines. The emptying pipe (409) is used for emergency discharge or fault pressure relief. The bag type dust collector (200) is provided with a pulse blowing pipe (201) for instant reverse impact on the filter bag by high-speed compressed air to strip the paint mist fine particles and dust layer attached to the surface of the filter bag, restore the air permeability of the filter bag and reduce the operation resistance. The maintenance staircase (500) is provided with a ladder (501) and is used for providing a safe, stable and ergonomic up-and-down channel for the operator to reach the high-position equipment such as the activated carbon adsorption box, the desorption pipeline, the catalytic bed (600) and the burner (700) for maintenance, maintenance, filter material replacement or fault troubleshooting, thereby ensuring long-term stable and safe operation of the entire paint mist treatment system. The exhaust ditch is connected between the polishing primer chamber and the box type glass fiber filter (100).

5. A finish primer booth paint mist treatment system as defined in claim 1, wherein: The active carbon box (302) has at least three, which is suspended by the carbon box support (303), the active carbon box (302) is connected with the adsorption air inlet pipe (301) through the adsorption air inlet valve (306), the adsorption air inlet pipe (301) is used to guide the pretreated exhaust gas into the adsorption zone;The active carbon box (302) is connected with the adsorption air outlet pipe (304) through the adsorption air outlet valve (307), the adsorption air outlet pipe (304) is connected to the main exhaust system, and the chimney (800) is connected through the adsorption exhaust fan (305).

6. A sanding primer booth finish paint mist treatment system according to claim 1 or 5, wherein: The catalytic bed (600) is a honeycomb noble metal catalytic bed (600), which adopts a ceramic honeycomb carrier as a matrix, an inner wall is coated with a transition layer such as alumina and loaded with platinum and palladium noble metals, is integrally formed into a regular square hole, and cerium and lanthanum additives are added to enhance the redox capacity and thermal stability.

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