A coating VOCs exhaust gas treatment device

Abstract

The utility model provides a kind of coating VOCs waste gas treatment device, including bottom plate, the upper end of bottom plate is provided with left side and is provided with air inlet pipe, the inside of air inlet pipe is provided with fan, the right end of air inlet pipe is connected with filter box by air pipe, the inside of filter box is detachably provided with filter plate, the left end of filter plate is provided with cleaning assembly, cleaning assembly includes the sliding slot being set in the inside of filter box, the inside of sliding slot is provided with sliding rod, sliding plate is slidably arranged between two sliding rods, by the coating VOCs waste gas treatment device of the utility model, by setting brush plate, sliding plate drives brush plate to move, and then brush plate can clean filter plate, brush plate regularly (such as every hour, every shift) automatically sweeps filter plate surface paint mist, dust, maintains filter pressure difference stable, and then can ensure that fan air volume is constant, waste gas is continuously and effectively collected and handled, and VOCs is prevented from escaping.

Description

Technical Field

[0001] This utility model belongs to the technical field of waste gas treatment devices, and specifically relates to a coating VOCs waste gas treatment device. Background Technology

[0002] During the production, application (such as in automobiles, furniture, steel structures, ships, and buildings) and use of coatings, a large amount of volatile organic compounds (VOCs) are released. If these waste gases are discharged directly without treatment, they will cause serious harm to the environment, human health, and the compliant operation of enterprises. Therefore, it is necessary to use coating VOCs waste gas treatment devices to treat VOCs waste gases.

[0003] Most existing VOCs exhaust gas treatment devices for coatings filter the exhaust gas through a filter plate inside a filter box before sending it to a purification box for further purification. While this method can meet the requirement of initially filtering particulate impurities in the exhaust gas before sending it to the purification box for further treatment, the filter plates inside the filter box cannot be cleaned in a timely manner. After prolonged filtration, the filter plates are prone to clogging, requiring frequent cleaning by staff, which increases the labor intensity of staff and reduces work efficiency. Utility Model Content

[0004] In view of this, this utility model addresses the shortcomings of the prior art by providing a paint VOCs exhaust gas treatment device. By setting up a brush plate, the moving plate drives the brush plate to move, thereby enabling the brush plate to clean the filter plate. The brush plate automatically cleans the paint mist and dust on the surface of the filter plate periodically (such as every hour or every shift), maintaining a stable filtration pressure difference, thereby ensuring a constant fan air volume, continuous and effective collection and treatment of exhaust gas, and preventing VOCs from escaping.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a coating VOCs waste gas treatment device, including a base plate, an air inlet pipe on the left side of the upper end of the base plate, a fan inside the air inlet pipe, a filter box connected to the right end of the air inlet pipe through an air duct, a filter plate detachably installed inside the filter box, a cleaning component on the left end of the filter plate, the cleaning component including a sliding groove inside the filter box, a sliding rod inside the sliding groove, a movable plate slidably installed between two sliding rods, a brush plate installed at the end of the movable plate near the filter plate, and a driving component for driving the movable plate to move at the upper end of the filter box.

[0006] As a further improvement of this utility model, the driving component includes a telescopic push rod disposed at the upper end of the filter box, the telescopic end of which extends into the interior of the filter box and connects with the upper side wall of the moving plate.

[0007] As a further improvement of this utility model, the sidewall of the brush plate abuts against the filter plate.

[0008] As a further improvement of this utility model, a through hole is provided at the lower end of the filter box, and a collection box is provided at the lower end of the through hole.

[0009] As a further improvement of this utility model, a purification box is provided at the right end of the filter box, and a purification component is provided inside the purification box.

[0010] As a further improvement of this utility model, the purification component includes an air inlet equalization mesh disposed at the left end of the purification box, and a filter screen disposed at the right end of the air inlet equalization mesh.

[0011] As a further improvement of this utility model, an ultraviolet lamp is provided at the right end of the filter screen, and an outlet flow equalization net is fixedly installed on the right side of the ultraviolet lamp.

[0012] As a further improvement of this utility model, an air outlet is provided at the right end of the purification box.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: Firstly, by setting up a brush plate, the moving plate drives the brush plate to move, which in turn allows the brush plate to clean the filter plate. The brush plate automatically cleans the paint mist and dust on the surface of the filter plate periodically (such as every hour or every shift), maintaining a stable filtration pressure difference. This ensures a constant fan air volume, continuous and effective collection and treatment of exhaust gas, and prevents VOCs from escaping.

[0014] Secondly, by setting up a collection box, the dust cleaned by the brush plate can fall into the collection box through the through hole, and the dust can be collected. After the dust falls into the collection box automatically, the worker only needs to take out the collection box periodically (such as weekly), seal and pack it → affix a hazardous waste label → transfer it to a qualified unit for disposal. There is no need to enter the filter box for cleaning, and a single person can complete the dust cleaning operation, which improves efficiency by more than 80%.

[0015] Thirdly, by setting up a filter screen, the material of which is activated carbon filter cotton, the activated carbon filter cotton has a high specific surface area and rich microporous structure, and has a strong adsorption capacity for the following substances: benzene, toluene, xylene (BTX), irritating odors produced by paint and thinner. It is particularly suitable for: water-based paint exhaust gas (containing alcohols and ethers, which are difficult to be efficiently treated by combustion methods), large air volume, low concentration of coating exhaust gas, and improves purification efficiency.

[0016] Fourth, by setting up an airflow equalization network, when exhaust gas enters the purification box from the pipeline, the airflow often deviates to one side due to reasons such as the eccentric position of the inlet and excessive wind speed, forming a high-speed short-circuit zone, which causes the exhaust gas to flow out without being fully treated, or a low-speed dead zone, resulting in the accumulation of pollutants and low utilization rate of purification materials. The airflow equalization network (such as a perforated plate, honeycomb grid or metal mesh) forces the airflow to be evenly distributed on the cross section through local resistance adjustment, ensuring that the entire purification cross section is effectively utilized. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cleaning component structure of this utility model; Figure 3 This is a schematic diagram of the purification box and filter screen structure of this utility model; Figure 4 This is a front view structural diagram of the present invention.

[0019] In the diagram: 101, base plate; 102, air inlet duct; 103, fan; 104, filter box; 105, filter plate; 106, slide bar; 107, moving plate; 108, brush plate; 201, telescopic push rod; 202, collection box; 301, purification box; 302, air inlet equalization mesh; 303, filter screen; 304, ultraviolet lamp; 305, air outlet equalization mesh; 306, air outlet. Detailed Implementation

[0020] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0021] like Figure 1 , 2 As shown in Figure 3, a VOCs waste gas treatment device for coatings includes a base plate 101. An air inlet pipe 102 is located on the upper end of the base plate 101 and on the left side. A fan 103 is installed inside the air inlet pipe 102. If VOCs generated during the coating process (such as spraying and drying) are not captured in time, they will be emitted into the workshop or environment without proper control. The fan 103 operates within the air inlet pipe 102, keeping the entire collection system (including the gas collection hood, air duct, and filter box 104) under negative pressure, ensuring that the waste gas is efficiently drawn in from the source and preventing leakage. The right end of the air inlet duct 102 is connected to the filter box 104 via the air duct. The filter box 104 is detachably equipped with a filter plate 105. The left end of the filter plate 105 is equipped with a cleaning component. The cleaning component includes a sliding groove inside the filter box 104. The sliding groove is equipped with a sliding rod 106. A moving plate 107 is slidably arranged between the two sliding rods 106. A brush plate 108 is provided at the end of the moving plate 107 near the filter plate 105. The upper end of the filter box 104 is equipped with a driving component for driving the moving plate 107 to move.

[0022] like Figure 2 As shown, the driving component includes a telescopic push rod 201 mounted on the upper end of the filter box 104. The telescopic end of the telescopic push rod 201 extends into the interior of the filter box 104 and connects to the upper side wall of the moving plate 107. The side wall of the brush plate 108 abuts against the filter plate 105. When the telescopic push rod 201 is activated, the telescopic end of the telescopic push rod 201 drives the moving plate 107 to move along the slide rod 106. The moving plate 107 drives the brush plate 108 to move, thereby enabling the brush plate 108 to clean the filter plate 105. The brush plate 108 automatically cleans the paint mist and dust on the surface of the filter plate 105 periodically (e.g., every hour, every shift), maintaining a stable filtration pressure difference. This ensures that the air volume of the fan 103 is constant, and that the exhaust gas is continuously and effectively collected and treated, preventing VOCs from escaping.

[0023] like Figure 2 As shown, a through hole is provided at the lower end of the filter box 104, and a collection box 202 is provided at the lower end of the through hole. The dust cleaned by the brush plate 108 can fall into the collection box 202 through the through hole, and the dust can be collected. After the dust falls into the collection box 202 automatically, the worker only needs to periodically (such as weekly) remove the collection box 202, seal and pack it → affix a hazardous waste label → transfer it to a qualified unit for disposal. There is no need to enter the filter box 104 for cleaning. A single person can complete the dust removal operation, which improves efficiency by more than 80%.

[0024] like Figure 3 As shown, a purification box 301 is provided at the right end of the filter box 104, and a purification component is provided inside the purification box 301.

[0025] like Figure 3 As shown, the purification component includes an air inlet equalization mesh 302 located at the left end of the purification box 301. When exhaust gas enters the purification box 301 from the pipe, the airflow often deviates to one side due to reasons such as eccentric inlet position and excessive wind speed, forming a high-speed short-circuit zone, resulting in exhaust gas flowing out without being fully treated, or a low-speed dead zone, leading to pollutant accumulation and low utilization rate of purification materials. The air inlet equalization mesh 302 (such as a perforated plate, honeycomb grid, or metal mesh) forces the airflow to be evenly distributed on the cross section through local resistance adjustment, ensuring that the entire purification cross section is effectively utilized. A filter mesh 303 is set at the right end of the air inlet equalization mesh 302. The filter mesh 303 is made of activated carbon filter cotton. Activated carbon filter cotton has a high specific surface area and rich microporous structure, and has a strong adsorption capacity for the following substances: benzene, toluene, xylene (BTX), irritating odors produced by paint and thinner. It is particularly suitable for: water-based paint exhaust gas (containing alcohols and ethers, which are difficult to be efficiently treated by combustion), large air volume, low concentration painting exhaust gas, and improves purification efficiency.

[0026] like Figure 3As shown, a UV lamp 304 is installed at the right end of the filter 303. The UV lamp 304 (usually in the UVC band, 254nm or 185nm) can excite oxygen in the air to generate ozone, and in conjunction with a photocatalyst, produce highly oxidizing hydroxyl radicals and superoxide radicals. These active substances can oxidize the low concentration of VOCs (such as benzene, toluene, formaldehyde, esters, etc.) remaining in the airflow after filtration into carbon dioxide, water, and harmless small molecules, while simultaneously removing the irritating odor generated by spraying. An outlet flow equalization net 305 is fixedly installed on the right side of the UV lamp 304. After the exhaust gas passes through the filter 303 and the UV lamp 304 cavity, it often results in local high-speed zones (short circuits) and low-speed zones (dead zones) due to uneven suction by the fan 103 and internal structural obstructions (such as lamp brackets and guide plates). The outlet flow equalization net 305 (usually a perforated plate, honeycomb mesh, or metal wire mesh) increases local resistance and forces airflow redistribution, making the cross-sectional wind speed deviation ≤ ±15% to achieve uniform outflow.

[0027] In use, airflow is drawn into the air inlet duct 102 by the fan 103, first passing through the filter box 104. The filter plate 105 inside the filter box 104 can perform preliminary filtration of the exhaust gas, intercepting paint mist and particulate matter to prevent blockage and pollution. Then, the gas enters the filter box 104 and first passes through the airflow equalization net 302. When the exhaust gas enters the purification box 301 from the duct, it is often caused by factors such as an off-center inlet position and excessive wind speed, resulting in the airflow being deflected to one side, forming a high-speed short-circuit zone, causing the exhaust gas to flow out without being fully treated, or a low-speed dead zone, leading to the accumulation of pollutants, low utilization rate of purification materials, and uneven airflow. The flow net 302 (such as a perforated plate, honeycomb grid, or metal mesh) forces the airflow to be evenly distributed across the cross-section through local resistance adjustment, ensuring that the entire purification cross-section is effectively utilized. Then, the gas passes through the filter 303, which is made of activated carbon filter cotton. Activated carbon filter cotton has a high specific surface area and abundant microporous structure, and has a strong adsorption capacity for the following substances: benzene, toluene, xylene (BTX), irritating odors produced by paint and thinner. It is particularly suitable for: water-based paint exhaust gas (containing alcohols and ethers, which are difficult to be efficiently treated by combustion methods), large air volume, low concentration painting exhaust gas, and improves purification efficiency.

[0028] Next, the gas passes through the irradiation area of ​​UV lamp 304. UV lamp 304 (usually UVC band, 254 nm or 185 nm) can excite oxygen in the air to generate ozone, which, together with the photocatalyst, produces highly oxidizing hydroxyl radicals and superoxide radicals. These active substances can oxidize the low concentration of VOCs (such as benzene, toluene, formaldehyde, esters, etc.) that remain in the airflow after filtration into carbon dioxide, water, and harmless small molecules, while simultaneously removing the irritating odor generated by spraying. Then, it passes through the outlet flow equalization net 305. After the exhaust gas passes through the filter 303 and the UV lamp 304 cavity, it often causes local high-speed zones (short circuits) and low-speed zones (dead zones) due to uneven suction by the fan 103 and internal structural obstructions (such as lamp brackets and guide plates). The outlet flow equalization net 305 (usually a perforated plate, honeycomb mesh, or metal wire mesh) increases local resistance and forces the airflow to redistribute, so that the cross-sectional wind speed deviation is ≤ ±15%, achieving uniform outflow.

[0029] After a long period of filtration, a lot of impurities will remain on the surface of the filter plate 105. At this time, the telescopic push rod 201 is activated. The telescopic end of the telescopic push rod 201 drives the moving plate 107 to move along the slide rod 106. The moving plate 107 drives the brush plate 108 to move, so that the brush plate 108 can clean the filter plate 105. The brush plate 108 automatically cleans the paint mist and dust on the surface of the filter plate 105 periodically (such as every hour or every shift) to maintain a stable filtration pressure difference. This ensures that the air volume of the fan 103 is constant, the exhaust gas is continuously and effectively collected and treated, and VOCs are prevented from escaping.

[0030] According to another embodiment of the present invention, such as Figure 1 , 4 As shown, an air outlet 306 is provided at the right end of the purification box 301, and an air outlet hood is provided at the air outlet 306. If the air outlet 306 is directly exposed, the purified gas may be re-inhaled by the workshop fresh air system or doors and windows due to wind direction, building eddies, etc. (i.e., "exhaust gas short circuit"), which is especially risky in low-rise factories and dense factory areas. The air outlet hood (often designed as an umbrella shape, cone shape or with guide vanes) can increase the emission dynamic pressure, promote the rapid rise and diffusion of airflow, reduce the VOCs concentration at the factory boundary, and avoid excessive fugitive emissions.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A VOCs waste gas treatment device for coatings, comprising a base plate (101), characterized in that: The upper end of the base plate (101) is provided with an air inlet pipe (102) on the left side, and a fan (103) is provided inside the air inlet pipe (102). The right end of the air inlet pipe (102) is connected to a filter box (104) through an air duct. A filter plate (105) is detachably provided inside the filter box (104). A cleaning component is provided on the left end of the filter plate (105). The cleaning component includes a sliding groove provided inside the filter box (104). A sliding rod (106) is provided inside the sliding groove. A moving plate (107) is slidably provided between the two sliding rods (106). A brush plate (108) is provided at the end of the moving plate (107) near the filter plate (105). A driving component for driving the moving plate (107) to move is provided at the upper end of the filter box (104).

2. The coating VOCs waste gas treatment device as described in claim 1, characterized in that: The driving component includes a telescopic push rod (201) disposed at the upper end of the filter box (104), the telescopic end of which extends into the interior of the filter box (104) and connects to the upper side wall of the movable plate (107).

3. The coating VOCs waste gas treatment device as described in claim 1, characterized in that: The sidewall of the brush plate (108) abuts against the filter plate (105).

4. The coating VOCs waste gas treatment device as described in claim 1, characterized in that: The filter box (104) has a through hole at its lower end, and a collection box (202) is provided at the lower end of the through hole.

5. The coating VOCs waste gas treatment device as described in claim 1, characterized in that: A purification box (301) is provided at the right end of the filter box (104), and a purification component is provided inside the purification box (301).

6. The coating VOCs waste gas treatment device as described in claim 5, characterized in that: The purification component includes an air inlet equalization net (302) disposed at the left end of the purification box (301), and a filter (303) disposed at the right end of the air inlet equalization net (302).

7. The coating VOCs waste gas treatment device as described in claim 6, characterized in that: An ultraviolet lamp (304) is provided at the right end of the filter (303), and an outlet flow equalization net (305) is fixedly installed on the right side of the ultraviolet lamp (304).

8. The coating VOCs waste gas treatment device as described in claim 5, characterized in that: An air outlet (306) is provided at the right end of the purification box (301).

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