Device for trapping paint waste gas aerosol

Abstract

The utility model relates to a device for trapping paint waste gas aerosol, which comprises a positive pole column, a bottom plate and a negative pole side wall, a cavity is formed by the bottom plate and the negative pole side wall, and the positive pole column is arranged in the middle of the cavity; an air inlet is formed in the bottom plate, and an air outlet is formed in the upper end of the cavity; a water inlet is formed in the negative electrode side wall, first water outlets which are uniformly distributed on the inner wall of the negative electrode side wall by a circle are formed corresponding to the water inlet, and after water is introduced, a layer of water film or water curtain is annularly formed on the whole inner wall of the negative electrode side wall or close to the inner wall; a second water outlet is formed in the lower end of the outer side of the negative electrode side wall and is used for discharging water flowing down from the water film or the water curtain; during working, a high-voltage electric field is formed between the positive pole and the negative pole side wall. According to the device disclosed by the utility model, paint waste gas aerosol is effectively captured and separated, the paint spraying environment is effectively improved, and the treated water meets the environment-friendly discharge requirement; the device is simple in structure and low in cost, and has good economic value.

Description

Technical Field

[0001] The utility model relates to a device for capturing paint waste gas aerosol, and belongs to the technical field of paint waste gas aerosol processing equipment. Background Art

[0002] The spray painting process is widely used in machinery, electrical equipment, household appliances, automobiles, ships, furniture and other industries. The raw materials (paints) of spray paint are composed of non-volatile components and volatile components. The non-volatile components include film-forming substances and auxiliary film-forming substances, and the volatile components refer to solvents and diluents (mainly xylene). The organic gas in the spray painting exhaust comes from the volatilization of solvents and diluents. The organic solvent will not adhere to the surface of the sprayed paint with the paint. It will be released to form organic waste gas during the spray painting and curing process. The amount of xylene waste gas volatilized in the spray painting process accounts for about 60% of the diluent usage, and another 40% volatilizes during the light curing process. The two-phase suspension formed after the volatilization of the paint and solvent in the spray painting operation escapes into the surrounding air, polluting the air and endangering human health. Especially for the waste gas treatment of photocuring paint, since it needs to be treated by heat storage combustion later, during the combustion process, the aerosol is very easy to adhere to the surface of the heat storage body, reducing the effectiveness of the heat storage body and increasing the difficulty of complete combustion of the waste gas. Therefore, how to effectively capture the paint waste gas aerosol generated in the painting process is a technical problem that needs to be solved urgently. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In order to solve the above problems in the prior art, the utility model provides a device and method for capturing paint waste gas aerosol.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0007] A device for capturing paint waste gas aerosols comprises a positive pole, a bottom plate and a negative pole side wall, wherein the bottom plate and the negative pole side wall form a cavity, and the positive pole is arranged in the middle of the cavity; an air inlet is provided on the bottom plate; a water inlet is provided on the negative pole side wall, and a first water outlet is provided inside the upper end of the negative pole side wall corresponding to the water inlet, and the first water outlet is evenly distributed around the inner wall of the negative pole side wall, and after water is passed, a water film or water curtain is formed in a circle around the entire inner wall of the negative pole side wall or a position close to the inner wall; when working, a high-voltage electric field is formed between the positive pole and the negative pole side wall.

[0008] In the device as described above, preferably, a second water outlet is provided on the outer side of the negative electrode side wall, and the second water outlet is used to discharge water flowing down from the water film or the water curtain.

[0009] In the device as described above, preferably, the air inlet is connected to an absorption device, and the absorption device is used to absorb the paint waste aerosol, i.e., paint mist, generated by spraying paint.

[0010] In the device as described above, preferably, the air inlet is provided with a valve for adjusting the gas flow rate.

[0011] In the device as described above, preferably, the voltage difference of the high voltage electric field is 18 kV to 60 kV.

[0012] The device as described above is preferably provided with a filter at the air inlet, and the filter is used to filter and remove large particles.

[0013] In the device as described above, preferably, the positive electrode column is a cylindrical or square column, and the overall shape of the negative electrode side wall is a round barrel or a square barrel.

[0014] In the device as described above, preferably, the position of the first water outlet is flush with or slightly higher than the upper end surface of the positive electrode column, and the second water outlet is connected to the water inlet through a pipeline, and a circulation pump is provided on the pipeline to realize water recycling.

[0015] (III) Beneficial effects

[0016] The beneficial effects of the present invention are:

[0017] The utility model provides a device for capturing paint waste gas aerosols, which has simple configuration and low cost. It can effectively capture the paint waste gas aerosols in the polluted air and then return them to water. Adding a coagulant to the water can precipitate and solidify the aerosols, which becomes a solid after solidification, effectively improving the paint spraying environment. The treated water meets environmentally friendly emission requirements.

[0018] The utility model provides a device for capturing paint waste gas aerosols, which can effectively capture most aerosols, with a capturing efficiency of more than 95%; it can also capture most paint solvents, and can ionize paint solvent molecules or aerosol clusters, so that most of the harmful substances in the air are removed, effectively avoiding harm to the health of spray painting workers and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic longitudinal section of a device preferably used for capturing paint waste gas aerosols according to the utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of a device preferably used for capturing paint waste gas aerosols according to the utility model;

[0021] Figure 3 It is a schematic longitudinal section diagram of the utility model device when it is in operation.

[0022] [Description of Reference Numerals]

[0023] 1: positive electrode;

[0024] 2: Bottom plate;

[0025] 3: negative electrode side wall;

[0026] 4: Aerosol;

[0027] 5: Water film;

[0028] 6: Water;

[0029] 7. Air inlet;

[0030] 8. Water inlet;

[0031] 9. Pipeline. DETAILED DESCRIPTION

[0032] The utility model provides a device for capturing paint waste gas aerosol. When the device is working, the paint waste gas aerosol passes through the high-voltage electric field formed by the device, so that the aerosol is positively charged under the action of the electric field and moves toward the negative electrode. When the positively charged aerosol contacts the water film or water curtain near the negative electrode, it will dissolve into the water film or water curtain, and then flow out with the water film or water curtain, thereby achieving the purpose of capturing the paint waste gas aerosol.

[0033] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0034] Example 1

[0035] A device for capturing paint exhaust aerosols, such as Figure 1 and Figure 2 As shown, it includes a positive pole column 1, a bottom plate 2, and a negative pole side wall 3. The bottom plate 2 and the negative pole side wall 3 form a cavity with a closed lower end, and the positive pole column 1 is arranged in the middle of the cavity; an air inlet is opened on the bottom plate, and an air outlet is arranged at the upper end of the cavity; a water inlet is arranged on the negative pole side wall, and a first water outlet is arranged inside the upper end of the negative pole side wall corresponding to the water inlet, and the first water outlet is evenly distributed around the inner wall of the negative pole side wall. After water is passed, a layer of water film or water curtain is formed in a circle on the entire inner wall of the negative pole side wall or near the inner wall, and the middle of the water film or water curtain is facing the positive pole column 1.

[0036] The positive pole 1 and the negative pole side wall 3 are connected to a DC high voltage converted by a transformer, and the high voltage electric field formed by the high voltage electrode has an adjustable size. The voltage difference forming the electric field is preferably 18 kV to 60 kV. The arrow in the figure indicates the direction of the electric field. The air inlet on the bottom plate can be connected to an absorption device, which is used to absorb the paint mist generated by spray painting, that is, the paint waste gas aerosol. Furthermore, a filter screen is also provided at the air inlet, which is used to filter large particles.

[0037] Furthermore, in order to effectively adjust the flow rate or flow velocity of the aerosol entering the high voltage electric field, a valve for adjusting the gas flow rate is provided on the air inlet.

[0038] In order to discharge the water collected at the bottom, a second water outlet is provided at the lower end of the outer side of the negative electrode side wall, and the second water outlet is used to discharge the water flowing down the water film or water curtain. Further, the position of the second water outlet is set lower than the lower end surface of the positive electrode column 1.

[0039] The shape of the positive electrode column 1 can be set to be a cylindrical column or a square column. The overall shape of the negative electrode side wall can be set to be a cylindrical round barrel or a square barrel.

[0040] When working, water is first introduced into the water inlet to form a water film or water curtain on the inner wall of the negative electrode side wall. Then power is turned on, and under the action of the high voltage electric field, Figure 1 In the process, the aerosol 4 of the paint waste gas entering the electric field loses electrons and becomes positively charged. Under the action of the high-voltage electric field, it moves toward the negative electrode side wall, contacts the water film 5 on the negative electrode side wall and dissolves into the water film 5. The water film 5 flows down from top to bottom under the action of gravity and gathers on the bottom plate to form water 6 containing aerosol. The aerosol water 6 can be put into the recovery water tank through the second water outlet, and a flocculant (aluminum sulfate or polysulfuric acid) is added to the water tank for stirring. The flocculant settles to the bottom, and the treated water meets the environmental discharge requirements and can be discharged; the aerosol precipitates and becomes powder, and the powder is taken out regularly, and the powder is compressed into blocks to become solid waste, and the solid waste is recycled and refined and separated.

[0041] Example 2

[0042] When capturing the paint waste gas aerosol, the paint waste gas aerosol generated by the spray painting, i.e., the paint mist, is first collected by an absorption device. After the paint mist is filtered to remove large particles, the mist-like mixed aerosol enters the electrostatic field channel with the positive electrode in the middle and the negative electrode in the periphery. The electrostatic field channel can be the device for capturing the paint waste gas aerosol in Example 1, such as Figure 3 As shown, water is first passed to the water inlet 8 to form a water film 5 on the inner wall of the negative electrode side wall; after power is turned on, a high-voltage electric field is generated; the mist-like mixed aerosol enters the electrostatic field channel through the air inlet 7. Under the action of the high-voltage electric field, the aerosol 4 of the paint waste gas loses electrons and becomes positively charged. Figure 3 The arrow in the figure indicates the direction of the aerosol 4 flow. The positively charged aerosol moves toward the negative electrode side wall under the action of the electric field. If there is no water film or water curtain near the negative electrode side wall, it will be adsorbed on the negative electrode side wall to form a thick film, which will be difficult to clean over time. If there is a water film 5, the positively charged aerosol dissolves in the water film, flows down from top to bottom with the water film 5, and gathers on the bottom plate to form water 6 with aerosol. The water can be discharged and then treated with flocculants. It is also possible to add flocculants to the bottom of the bottom plate by providing a flocculant addition port, and then discharge them for recycling after treatment.

[0043] In one embodiment, if Figure 3 In order to recycle water, a water inlet 8 is provided at the upper end of the negative electrode side wall, and the second water outlet of the negative electrode side wall is connected to the water inlet 8 at the upper end through a pipe 9. The lower end interface of the pipe 9, i.e., the water outlet, is located lower than the lower end surface of the positive electrode column 1, and the upper end interface of the pipe 9, i.e., the water inlet 8, is flush with the upper end surface of the positive electrode column 1. A lifting pump is provided on the pipe 9 to lift the water at the lower end to the upper end for recycling. The aerosol treatment device of the utility model can collect more than 95% of the aerosol entering the electric field pipe.

[0044] For the treatment of waste gas from light-curing paint, the waste gas after the aerosol is captured needs to be treated by heat storage combustion. During the combustion process, the aerosol is very easy to adhere to the surface of the heat storage body, reducing the effectiveness of the heat storage body and increasing the difficulty of complete combustion of the waste gas. The waste gas treated by the device of the utility model can be smoothly heated by the heat storage body to a temperature that can be continuously and completely burned, which greatly saves natural gas or electricity and saves resources.

[0045] The above is only a preferred embodiment of the utility model, and does not limit the utility model in other forms. Any person skilled in the art can use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A device for capturing paint waste gas aerosol, characterized in that: It includes a positive pole column, a bottom plate and a negative pole side wall, wherein the bottom plate and the negative pole side wall form a cavity, and the positive pole column is arranged in the middle of the cavity; an air inlet is opened on the bottom plate, and an air outlet is arranged at the upper end of the cavity; a water inlet is arranged on the negative pole side wall, and a first water outlet is arranged inside the upper end of the negative pole side wall corresponding to the water inlet, and the first water outlet is evenly distributed around the inner wall of the negative pole side wall. After water is passed, a layer of water film or water curtain is formed in a circle on the entire inner wall of the negative pole side wall or a position close to the inner wall; when working, a high-voltage electric field is formed between the positive pole column and the negative pole side wall.

2. The device according to claim 1, characterized in that A second water outlet is provided on the outer side of the negative electrode side wall, and the second water outlet is used to discharge water flowing down from the water film or the water curtain.

3. The device according to claim 1, characterized in that The air inlet is connected to an absorption device, and the absorption device is used to absorb paint waste gas aerosol generated by spraying paint.

4. The device according to claim 1, characterized in that A filter is also provided at the air inlet, which is used to filter and remove large particles.

5. The device according to claim 1, characterized in that The air inlet is provided with a valve for adjusting the gas flow rate.

6. The device according to claim 1, characterized in that The voltage difference of the high voltage electric field is 18 kilovolts to 60 kilovolts.

7. The device according to claim 1, characterized in that The positive electrode column is a cylindrical or square column, and the overall shape of the negative electrode side wall is a round barrel or a square barrel.

8. The device according to claim 2, characterized in that The position of the first water outlet is flush with or slightly higher than the upper end surface of the positive pole, and the position of the second water outlet is lower than the lower end surface of the positive pole; the second water outlet is connected to the water inlet through a pipeline, and a circulation pump is provided on the pipeline.

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