How to deal with the VOCs of the car paint booth?

Spraying technology is an indispensable part of the car manufacturing assembly line. Car painting machine and car welding machine are frequently used and the pollution is serious. In addition to national regulations, certain governance standards have been proposed in various places. In many industries, paint waste gas is a kind of waste gas that is difficult to purify. Only by adopting appropriate treatment technology according to the characteristics of the coating waste gas can low emissions and low energy consumption be achieved. Let's learn about the sources and treatment methods of exhaust gas in the car paint booth.

Sources of exhaust gas from car paint booths

The key source of organic waste gas in the automobile spraying workshop is the paint mist that the solvent contained in the paint coating evaporates during the whole painting process and the volatile organic waste gas caused by the dry process.

The key ingredients are benzene, xylene, xylene, etc. Generally speaking, the water content of VOCs (industrial waste gas) caused by the application of intermediate coating, top coating and cleaning of organic solvents is large. Actually, in the assembly workshop, there are spraying rooms, drying rooms, paint mixing rooms, drying rooms, etc. that cause a lot of industrial waste gas. The organic waste gas components caused by different production workshops are different.

Waste gas treatment method for spray booth

1. Water spray method + activated carbon adsorption desorption + catalytic combustion

(1) Use a spray tower to remove paint mist and water-soluble substances, then pass through a dry filter and enter the activated carbon adsorption device. When the activated carbon is fully adsorbed, desorb again to remove the gas after desorption. The fan enters the catalytic combustion device to burn, burns into carbon dioxide and water, and then discharges;

(2) Generally applicable to the organic waste gas concentration between 2000-5000mg/m3, the organic waste gas undergoes low-temperature oxidation and flameless combustion under the action of a catalyst to oxidize the organic components into CO2 and H2O products.

Features: flameless combustion, easy to control, low combustion control temperature, low external heating energy consumption, different types of catalysts and combustion processes must be selected for different exhaust gas components.

2. Water spray + UV light oxygen waste gas treatment + activated carbon adsorption desorption

The spray tower is used to remove paint mist and water-soluble substances, and then through a dry filter, enter the UV photo-catalytic exhaust gas treatment equipment and then the activated carbon adsorption device. When the activated carbon is fully adsorbed, desorption (desorption method) There are steam desorption, electric heating desorption, nitrogen desorption), the treated waste gas is absorbed and concentrated and then condensed, and the condensate is separated and recovered valuable organic matter. This method is used for waste gas treatment with high concentration, low temperature and small air volume.

Through different pollution control devices and pollution control systems, using industrial RTO and automotive TAR equipment to reduce environmental pollution and control the air pollution in time, the exhaust gas problem will be greatly improved.