Movable purification device for treating paint spraying pollution gas

Abstract

The invention discloses a movable purification device for treating paint spraying pollution gas, and belongs to the technical field of waste gas treatment.The movable purification device comprises a movable frame body, a trapping unit, an atomization unit, a digestion unit and a backflow unit, the trapping unit, the atomization unit and the digestion unit are all connected with a control panel, and the automation degree is high; the trapping unit, the atomization unit, the digestion unit and the control panel are all connected with the distribution box. The device can move to any spraying operation site, paint pollution gas containing VOCs and particulate matter is captured through the capturing unit and conveyed to the atomization unit to be humidified, then part of the gas is settled, the part difficult to settle is conveyed to the digestion unit to be digested to form gaseous water and carbon dioxide, and then the gaseous water and the carbon dioxide are cooled through the backflow unit and flow back to the atomization unit to be secondarily treated. According to the invention, particulate matters and volatile harmful substances generated in the paint dilution process and the paint spraying process can be quickly and effectively purified and treated, and the unorganized emission of pollutants generated in the operation process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a mobile purification device for treating paint spraying polluted gas. Background Art

[0002] During the spraying process, some of the paint that is not attached to the target surface forms tiny droplets (i.e. paint mist) in the air, which will be suspended in the air to form particles; at the same time, solid components such as pigments and fillers in the paint may form fine solid particles during the spraying and drying process. These particles will not only affect the spraying quality (such as surface finish), but also pose a threat to the health of the operators, and may even cause respiratory diseases. They will also be discharged to the outside through the exhaust system and cause air pollution. More importantly, when the paint work area implements the paint spraying operation, it is often necessary to add paint thinners. Paint thinners are usually composed of volatile organic compounds (VOCs). Common ingredients include alcohols, ketones, ethers and aromatic hydrocarbons. After the thinner evaporates, a large amount of VOCs will be released, which will affect the surrounding atmospheric environment; at the same time, the volatile chemicals contained in the thinner are flammable and toxic. Inhalation or long-term contact will cause harm to human health. More importantly, with global warming, the greenhouse effect is becoming more and more serious, and the problem of carbon emissions has received great attention. Therefore, the particulate matter and volatile harmful substances generated in the paint work area need to be treated and purified, and the carbon dioxide generated during the organic matter treatment process also needs to be purified.

[0003] At present, the existing means of treating particulate matter and volatile substances in polluted gases generated in paint work areas include ventilation and capture, dry and wet filtration, and a combination of end-of-pipe treatment technologies such as adsorption, electrostatic precipitator, and catalytic oxidation. Although wet and dry filtration are more efficient in treating particulate matter, wet systems are prone to produce wastewater containing pollutants, and dry filtration requires frequent replacement of filter materials, increasing operating costs. Electrostatic precipitators have a good dust removal effect on fine particles, but they consume a lot of energy. As for the treatment of VOCs, ventilation and capture systems are prone to high energy consumption, and the unorganized entry of captured VOCs into subsequent treatment facilities will lead to direct emissions of untreated VOCs. The process is merely a transfer of pollution rather than elimination, that is, unorganized emissions will occur between the captured VOCs and the end-of-pipe treatment facilities. As for the subsequent end-of-pipe treatment methods, adsorption methods (such as activated carbon) have limited effects on high-concentration gas treatment, and the adsorption materials need to be frequently replaced or regenerated, which increases costs; catalytic and oxidation technology equipment requires large investment, complex operation and maintenance, and is not effective for waste gas with high humidity or containing particulate matter; biological treatment is slow and has difficulty coping with peak emissions; the absorption method has a limited scope of application and needs to be used in combination with other technologies.

[0004] In view of this, it is necessary to develop an exhaust gas treatment equipment that can efficiently purify paint spray pollutants, has low energy consumption and low operating costs. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a mobile purification device for treating paint spraying polluted gas.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A mobile purification device for treating paint spraying polluted gas, comprising a movable frame body, a bottom plate of which is provided with a capture unit, an atomization unit, a digestion unit and a reflux unit connected in sequence, wherein the reflux unit is connected to the atomization unit; the capture unit is used for capturing polluted gas; the atomization unit is used for spraying an alkaline solution on the captured polluted gas to achieve humidification, the digestion unit is used for digesting the humidified polluted gas, and the reflux unit is used for cooling the digestion product and refluxing it to the atomization unit for secondary treatment; the capture unit, the atomization unit and the digestion unit are all connected to a control panel, and the capture unit, the atomization unit, the digestion unit and the control panel are all connected to a distribution box.

[0007] Furthermore, the capture unit includes an air collecting hood, an air collecting pipe and an exhaust fan, the air collecting hood is connected to the exhaust fan through the air collecting pipe, and the air outlet of the exhaust fan is connected to the atomization unit; the exhaust fan is arranged on the bottom plate of the frame body, and the front part of the air collecting pipe and the air collecting hood both extend to the outside of the main frame body.

[0008] Furthermore, the air collecting hood is a universal air extraction hood, and the air collecting pipe is a telescopic hose.

[0009] Furthermore, the atomization unit includes an atomization box, an atomizer, a dust collection box and a water tank containing an alkaline solution, the water tank is arranged on the top of the atomization box, the atomization box is arranged on the top of the dust collection box, and the junction of the two is mutually interconnected, the dust collection box is arranged on the bottom plate of the frame body, and the atomizer is arranged on the outside of the atomization box; the outlet of the exhaust fan is connected to the air duct, the outlet end of the air duct passes through the atomization box and extends to the digestion unit, and a plurality of air holes facing the dust collection box are provided on the lower side wall of the air duct in the atomization box; the water inlet pipe of the atomizer is connected to the water tank through a water pump, the spray port of the atomizer extends into the air duct, and the spray port is correspondingly arranged above the air holes on the air duct.

[0010] Furthermore, the alkaline solution in the water tank is an aqueous solution of sodium hydroxide.

[0011] Furthermore, a first pressure relief valve is provided on the side wall of the atomization box.

[0012] Furthermore, the digestion unit includes a microwave generator, a microwave resonant cavity, an ultraviolet lamp tube assembly, a thermal catalyst bed and a photocatalyst bed. The microwave generator is arranged at the top of the microwave resonant cavity, and is used to radiate microwaves into the microwave resonant cavity; the ultraviolet lamp tube assembly is arranged at the top of the inner cavity of the microwave resonant cavity, the photocatalyst bed and the thermal catalyst bed are arranged in a digestion pipe inside the microwave resonant cavity in sequence, the outlet of the air duct is connected to the inlet of the digestion pipe, and the outlet of the digestion pipe is connected to the air outlet on the side wall of the microwave resonant cavity; the digestion pipe is made of quartz glass, and the polluted gas discharged from the air duct passes through the thermal catalyst bed and the photocatalyst bed in sequence to be digested.

[0013] Furthermore, the reflux unit includes a condenser, a return pipe and a reflux pipe. The condenser is obliquely arranged outside the microwave resonance cavity. The inner layer of the condenser is connected to the air outlet on the side wall of the microwave resonance cavity. The outer layer of the condenser is filled with a medium that can absorb heat. The bottom of the inner layer of the condenser is connected to the return pipe for transporting condensed water to a water tank. The air outlet at the upper end of the inner layer of the condenser is connected to the atomization box through the reflux pipe.

[0014] Furthermore, a second pressure relief valve is provided on the side wall of the microwave resonance cavity.

[0015] Furthermore, the frame body includes a base plate and a frame around it, the exhaust fan, atomization unit, digestion unit and distribution box of the capture unit are all arranged in the frame on the base plate, and the control panel is arranged above the frame; a plurality of rollers are provided at the bottom of the base plate, and an upwardly inclined handrail is provided on the upper front side of the frame.

[0016] Compared with the prior art, the present invention has the following technical advances: The present invention can be moved to any spraying operation site through the movable frame body, and the polluted gas in the spraying and paint dilution process is captured by the capture unit. The captured polluted gas is transported to the atomization unit for spraying alkaline solution humidification. Part of the gas will settle in the dust box below after humidification, and the part of the gas that cannot settle is transported to the digestion unit for digestion treatment to form gaseous water and carbon dioxide for discharge; the gaseous water is then liquefied by the reflux unit and circulated into the water tank of the atomization unit, and the carbon dioxide flows back to the atomization box and is captured by the alkaline water mist to achieve secondary treatment. The present invention realizes the control of the capture unit, the atomization unit and the digestion unit through the control panel, and has a high degree of automation; the present invention can conveniently handle the particulate matter and volatile harmful substances generated in the paint dilution process and the paint spraying process in the paint spraying work area, and carry out integrated rapid and effective purification treatment, thereby reducing the unorganized emission of pollutants generated during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] In the attached picture: Figure 1 A three-dimensional diagram of a mobile purification device for treating paint spraying polluted gas provided by an embodiment of the present invention; Figure 2 for Figure 1 The front view of the mobile purification unit; Figure 3 for Figure 2 Rear view of the mobile purification unit; Figure 4 for Figure 2 Left side view of the mobile purification unit; Figure 5 for Figure 2 Right side view of the mobile purification unit; Figure 6 for Figure 2 A top view of the mobile purification unit; Figure 7 for Figure 1 Schematic diagram of the internal structure of the mobile purification device after removing the water tank, atomization box and microwave resonant cavity; Figure 8 for Figure 7 Top view of the .

[0019] In the figure: 100-capture unit; 200-atomization unit; 300-digestion unit; 400-reflux unit; 1. Frame body; 2. Distribution box; 3. Microwave resonant cavity; 4. Atomizer box; 5. Gas collecting pipe; 6. Gas collecting hood; 7. Water tank; 8. Feed inlet; 9. Atomizer; 10. Air duct; 11. Return pipe; 12. Control panel; 13. Condenser; 14. Return pipe; 15. Water inlet pipe; 16. First pressure relief valve; 17. Second pressure relief valve; 18. Dust collection box; 19. Microwave generator; 20. Exhaust fan; 21. UV lamp assembly; 22. Digestion pipeline; 23. Handrail; 24. Roller. DETAILED DESCRIPTION

[0020] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0021] like Figure 1-6As shown, a mobile purification device for treating paint spraying polluted gas includes a movable frame body 1, and a bottom plate 101 of the frame body 1 is provided with a capture unit 100, an atomization unit 200, a digestion unit 300 and a reflux unit 400 connected in sequence, wherein the capture unit 100 is used to capture polluted gas; the atomization unit 200 is used to humidify the captured polluted gas, the digestion unit 300 is used to digest the humidified polluted gas, and the reflux unit 400 is used to cool the digestion product and reflux it to the atomization unit 200 for secondary treatment; the capture unit 100, the atomization unit 200 and the digestion unit 300 are all connected to a control panel 12, and the start and stop of each unit are controlled by the control panel 12; the capture unit 100, the atomization unit 200, the digestion unit 300 and the control panel 12 are all connected to a distribution box 2. Among them, the control panel adopts a PLC main control board, and the distribution box is connected to a three-phase 380V power supply. The movable frame body can be moved to any spraying operation site. The polluted gas in the spraying and paint dilution process is captured by the capture unit, and the captured polluted gas is transported to the atomization unit for humidification. Part of the gas will settle in the dust collecting box below after humidification, and the part of the gas that cannot settle is transported to the digestion unit for digestion treatment to form gaseous water and carbon dioxide for discharge.

[0022] As a preferred structure, Figure 1 As shown, the capture unit 100 includes an air collecting hood 6, an air collecting pipe 5 and an exhaust fan 20. The air collecting hood 6 is connected to the exhaust fan 20 through the air collecting pipe 5, and the air outlet of the exhaust fan 20 is connected to the atomization unit 200; the exhaust fan 20 is arranged on the bottom plate 101 of the frame body 1, and the front part of the air collecting pipe 5 and the air collecting hood 6 are extended to the outside of the main frame body 1. Among them, the air collecting hood 6 can be purchased as a universal exhaust hood according to actual needs, and the direction of the air collecting hood can be freely adjusted as the equipment moves; the air collecting pipe 5 is a telescopic hose, which can be made of a stainless steel bellows or other corrosion-resistant materials. The direction of the hood can be controlled by a retractable hose, so that the hood is close to the working area of ​​spraying and paint thinning, which can more significantly control the unorganized emissions of particulate matter and volatile organic substances. The particulate matter and volatile organic substances generated during the spraying and paint thinning process can be more effectively captured by the above structure, thereby achieving point-to-point directional and fixed-point collection of the generated polluted particulate matter and volatile organic substances.

[0023] In a specific embodiment of the present invention, Figure 2As shown, the atomization unit 200 includes an atomization box 4, an atomizer 9, a dust box 18 and a water tank 7 containing an alkaline solution, the water tank 7 is arranged on the top of the atomization box 4, the atomization box 4 is arranged on the top of the dust box 18, and the junction of the two is mutually connected, the dust box 18 is arranged on the bottom plate 101 of the frame body 1, and the atomizer 9 is arranged on the outside of the atomization box 4; the outlet of the exhaust fan 20 is connected to the air duct 10, the outlet end of the air duct 10 passes through the atomization box 4 and extends to the digestion unit 300, and a plurality of air holes facing the dust box 18 are provided on the lower side wall of the air duct 10 in the atomization box 4; the water inlet pipe 15 of the atomizer 9 is connected to the water tank 7 through a water pump, the spray port of the atomizer 9 extends into the air duct 10, and the spray port is correspondingly arranged above the air hole on the air duct 10. The alkaline solution in the water tank 7 is a sodium hydroxide aqueous solution, and water and sodium hydroxide can be injected through the feed port 8 at the top of the water tank 7, and stirred to form a sodium hydroxide aqueous solution. The sodium hydroxide aqueous solution in the water tank is atomized by an atomizer and then sprayed into the air duct. The sodium hydroxide aqueous solution can reduce the adhesion between the surface of the particles and the water droplets, making the particles easier to be captured and settled by the water droplets. For some polar or hydrophilic volatile organic compounds (such as alcohols, ketones, aldehydes, etc.), the sodium hydroxide aqueous solution helps to increase the solubility of these organic compounds, thereby improving their capture efficiency and the degree of attachment of water molecules. The polluted gas containing polluted particles and volatile organic compounds collides and combines with the atomized sodium hydroxide aqueous solution in the air duct, so that the captured pollutants (most of which are particles) are humidified and settled in the dust box below, while the volatile organic compounds enter the digestion unit after adding more water.

[0024] In the specific production, the atomizer adopts an ultrasonic atomizer, which acts on the alkaline solution entering, and atomizes the alkaline solution into particles during the high-frequency vibration process; the side of the dust box 18 is provided with a handle, which adopts a pull-out structure to facilitate the dumping of the sediment collected inside. At the same time, the side wall of the atomization box 4 is provided with a first pressure relief valve 16, which can ensure that the pressure in the atomization box remains constant and ensure the normal operation of the equipment.

[0025] In a specific embodiment of the present invention, Figure 7 , 8As shown, the digestion unit 300 includes a microwave generator 19, a microwave resonant cavity 3, an ultraviolet lamp tube assembly 21, a thermal catalyst bed and a photocatalyst bed. The microwave generator 19 is arranged at the top of the microwave resonant cavity 3, and is used to radiate microwaves into the microwave resonant cavity 3; the ultraviolet lamp tube assembly 21 is arranged at the top of the inner cavity of the microwave resonant cavity 3, the photocatalyst bed and the thermal catalyst bed are arranged in a digestion pipe 22 inside the microwave resonant cavity 3 in sequence, the outlet of the air duct 10 is connected to the inlet of the digestion pipe 22, and the outlet of the digestion pipe 22 is connected to the gas outlet on the side wall of the microwave resonant cavity 3; the material of the digestion pipe 22 is quartz glass, and the polluted gas discharged from the air duct 10 passes through the thermal catalyst bed and the photocatalyst bed in sequence to be digested. Among them, the UV lamp assembly is composed of two rows of upper and lower electrodeless UV lamps; the thermal catalyst bed is supported by quartz wool to support the thermal catalyst (precious metal catalyst, etc.), and the loose and porous structure increases the contact area between the thermal catalyst and the pollutants, and also increases the residence time of the pollutants in the thermal catalyst bed. With the assistance of microwaves, pollutants containing water can be rapidly heated up in a short time, and catalytic oxidation occurs under the action of the thermal catalyst. In a short period of time, most hydrocarbon organic matter can complete the oxidation bond breaking reaction. At the same time, due to the auxiliary effect of microwaves, the electromagnetic oscillation of the electrodeless UV lamp is stimulated to generate UV waves, and the gas after thermal catalysis enters the photocatalyst bed again. Under the action of UV waves, the photocatalyst acts on the remaining organic pollutants with high-strength covalent bonds. With the assistance of the photocatalyst, the UV waves break these covalent bonds, and the volatile organic matter is broken into gaseous water and carbon dioxide.

[0026] In addition, in order to ensure the safe digestion process, a second pressure relief valve 17 is provided on the side wall of the microwave resonance cavity 3 .

[0027] Further optimize the above scheme, such as Figure 6 , 7As shown, the reflux unit 400 includes a condenser 13, a water return pipe 14 and a reflux pipe 11. The condenser 13 is obliquely arranged outside the microwave resonance cavity 3. The inner layer of the condenser 13 is connected to the air outlet on the side wall of the microwave resonance cavity 3. The outer layer of the condenser 13 is filled with a heat-absorbing medium. The bottom of the inner layer of the condenser 13 is connected to the water return pipe 14 for conveying condensed water to the water tank 7. The air outlet at the upper end of the inner layer of the condenser 13 is connected to the atomization box 4 through the reflux pipe 11. The structure can be used to condense and recycle the gaseous water after microwave ultraviolet digestion treatment and capture carbon dioxide to achieve zero emission of gaseous pollutants. In the condenser, when the discharged mixed gas (containing CO2 and H2O) passes through, the gas will be cooled to a temperature lower than the condensation temperature of water (100°C). In this process, water vapor will condense into liquid water, while carbon dioxide will not usually condense in this process due to its low boiling point (-78.5°C). After being cooled by the condenser, the water vapor (H2O) will become liquid water and be diverted out, flowing into the water tank through the return pipe 14. Carbon dioxide, due to its lower condensation temperature, usually remains in the gaseous state and continues to flow downstream to the inside of the atomization box. Under the action of the atomized water containing alkaline solution, the gaseous carbon dioxide is captured by the alkaline water, and the generated carbonic acid or carbonate is captured in the dust collection box as the droplets settle. During the capture process, there will still be some fine particles that cannot naturally settle under the action of gravity. These atomized carbonic acid or carbonates collide with the pollutants entering the ultrasonic atomization area, and in the process, they have a certain adsorption and absorption effect on the pollutants, thereby enhancing the purification effect of the pollutants. The entire process only requires the addition of a certain amount of alkaline compounds to collect and treat the pollutants in the dust collection box.

[0028] Furthermore, the frame body 1 includes a bottom plate 101 and a frame 102 around it. The exhaust fan 20, atomization unit 200, digestion unit 300 and distribution box 2 of the capture unit 100 are all arranged in the frame 102 on the bottom plate 101, and the control panel 12 is arranged above the frame 102; a plurality of rollers 24 are arranged at the bottom of the bottom plate 101, and an oblique upward handrail 23 is arranged on the upper front side of the frame 102, so that the device can be moved to any work location by the handrail. The frame body with the above structure can reduce the overall weight of the device and is also convenient for processing and manufacturing.

[0029] In summary, the present invention has the following advantages: A) The present invention purifies the polluted particles and volatile organic compounds generated in the work area of ​​paint spraying and dilution operations. It adopts a portable and movable design, and can be used by plugging the distribution box into a three-phase 380V power supply. When implementing the spraying operation, the equipment can be moved to the spraying operation center, and through the control of the retractable universal air collection hood, the generated polluted particles and volatile organic compounds can be collected point by point in a directional and fixed manner, reducing the unorganized emission of pollutants generated during the operation.

[0030] B) The present invention integrates the pollutant capture unit, atomization unit and digestion unit together, reducing the unorganized emission of pollutants in multiple transfer processes during the treatment process. The multiple unit modules are centrally controlled through the control panel, and the activation and power regulation of multiple unit modules can be realized on the display screen of the control panel, which greatly reduces energy consumption.

[0031] C) The present invention uses ultrasonic atomization to atomize the alkaline aqueous solution, so that it collides and combines with the pollutant particles, increasing the contact area between the pollutants and the absorbent, and greatly increasing the sedimentation effect. Under the auxiliary effect of microwave and ultraviolet combined technology and catalyst, the high molecular organic compounds that are difficult to settle are broken during the high-temperature catalytic oxidation process, converted into small molecular organic matter and discharged, achieving a high-efficiency purification effect on pollutants.

[0032] D) The present invention practices green circular economy and thoroughly purifies the captured particulate matter and volatile organic matter. No secondary pollutants will be generated during the entire purification process. Under the action of the condenser, reflux pipe and water return pipe, the secondary utilization of tail gas products is achieved, reflecting the circular value.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A mobile purification device for treating paint spraying polluted gas, characterized in that: It comprises a movable frame body, on the bottom plate of which a capture unit, an atomization unit, a digestion unit and a reflux unit which are connected in sequence are arranged, and the reflux unit is connected to the atomization unit; the capture unit is used for capturing polluted gas; the atomization unit is used for spraying alkaline solution on the captured polluted gas to achieve humidification, the digestion unit is used for digesting the humidified polluted gas, and the reflux unit is used for cooling the digestion product and refluxing it to the atomization unit for secondary treatment; the capture unit, the atomization unit and the digestion unit are all connected to a control panel, and the capture unit, the atomization unit, the digestion unit and the control panel are all connected to a distribution box.

2. A mobile purification device for treating paint spraying polluted gas according to claim 1, characterized in that: The capture unit includes an air collecting hood, an air collecting pipe and an exhaust fan. The air collecting hood is connected to the exhaust fan through the air collecting pipe, and the air outlet of the exhaust fan is connected to the atomization unit. The exhaust fan is arranged on the bottom plate of the frame body, and the front part of the air collecting pipe and the air collecting hood both extend to the outside of the main frame body.

3. A mobile purification device for treating paint spraying polluted gas according to claim 2, characterized in that: The air collecting hood is a universal air extraction hood, and the air collecting pipe is a telescopic hose.

4. A mobile purification device for treating paint spraying polluted gas according to claim 2, characterized in that: The atomization unit comprises an atomization box, an atomizer, a dust collection box and a water tank containing an alkaline solution, wherein the water tank is arranged on the top of the atomization box, the atomization box is arranged on the top of the dust collection box, and the two are interconnected at the junction, the dust collection box is arranged on the bottom plate of the frame body, and the atomizer is arranged on the outside of the atomization box; the outlet of the exhaust fan is connected to the air duct, the outlet end of the air duct passes through the atomization box and extends to the digestion unit, and a plurality of air holes facing the dust collection box are arranged on the lower side wall of the air duct in the atomization box; the water inlet pipe of the atomizer is connected to the water tank through a water pump, the spray port of the atomizer extends into the air duct, and the spray port is correspondingly arranged above the air hole on the air duct.

5. A mobile purification device for treating paint spraying polluted gas according to claim 4, characterized in that: The alkaline solution in the water tank is a sodium hydroxide aqueous solution.

6. A mobile purification device for treating paint spraying polluted gas according to claim 4, characterized in that: A first pressure relief valve is arranged on the side wall of the atomizing box.

7. A mobile purification device for treating paint spraying polluted gas according to claim 4, characterized in that: The digestion unit comprises a microwave generator, a microwave resonant cavity, an ultraviolet lamp assembly, a thermal catalyst bed and a photocatalyst bed, wherein the microwave generator is arranged at the top of the microwave resonant cavity and is used to radiate microwaves into the microwave resonant cavity; The ultraviolet lamp tube assembly is arranged at the top of the inner cavity of the microwave resonant cavity, the photocatalyst bed and the thermal catalyst bed are arranged in a digestion pipe inside the microwave resonant cavity in sequence, the outlet of the air duct is connected to the inlet of the digestion pipe, and the outlet of the digestion pipe is connected to the gas outlet on the side wall of the microwave resonant cavity; the material of the digestion pipe is quartz glass, and the polluted gas discharged from the air duct passes through the thermal catalyst bed and the photocatalyst bed in sequence to be digested.

8. A mobile purification device for treating paint spraying polluted gas according to claim 7, characterized in that: The reflux unit includes a condenser, a water return pipe and a reflux pipe. The condenser is obliquely arranged outside the microwave resonance cavity. The inner layer of the condenser is connected to the air outlet on the side wall of the microwave resonance cavity. The outer layer of the condenser is filled with a medium that can absorb heat. The bottom of the inner layer of the condenser is connected to the water return pipe for transporting condensed water to a water tank. The air outlet at the upper end of the inner layer of the condenser is connected to the atomization box through the reflux pipe.

9. A mobile purification device for treating paint spraying polluted gas according to claim 7, characterized in that: A second pressure relief valve is provided on the side wall of the microwave resonance cavity.

10. A mobile purification device for treating paint spraying polluted gas according to any one of claims 1 to 9, characterized in that: The frame body includes a base plate and frames around it; the exhaust fan, atomization unit, digestion unit and distribution box of the capture unit are all arranged in the frame on the base plate, and the control panel is arranged above the frame; a plurality of rollers are arranged at the bottom of the base plate, and an upwardly inclined handrail is arranged at the upper front side of the frame.

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