With the increasingly strict enforcement of environmental protection, the maintenance of spray paint exhaust in automobile maintenance enterprises needs to be strengthened. Volatile organic pollutants are produced in various aspects such as paint mixing, spraying, baking paint, cleaning spray gun, etc., especially in the spray baking process, the paint contains Almost all of the VOCs are volatilized into the air of the paint booth, which is the main organized source of steam repair enterprises; the general management of the paint adjustment and cleaning spray guns is weak, and some even operate in the open area, and the volatile organic compounds generated are difficult to be effectively collected and processed. , is an important source of unorganized emissions.
The treatment methods of organic waste gas mainly include adsorption method, uv photo-oxidation method, catalytic combustion method, thermal combustion method, condensation method, etc. These methods have different characteristics in terms of applicable objects, processing effects, equipment costs, and operating costs. The main components of the company's spraying waste gas are benzene series, alcohol ethers, ester organic solvents, small amount of car repair and spraying, large amount of air in the spray booth, and low concentration organic waste. Automobile maintenance enterprises generally adopt integrated spray paint booths. It is equipped with filter cotton + activated carbon adsorption method to treat paint exhaust gas, wherein the ground cotton is mainly used to collect paint mist particles, and activated carbon is mainly used to adsorb VOCs.
At present, the relevant standards, the design specifications of the activated carbon loading has not been clearly defined, the common spray paint exhaust gas purification equipment uses a multi-layer activated carbon plate for adsorption, a total of about 4 pieces, the total weight of about 50kg, using horizontal or M-type placement. Activated carbon The loading amount determines the total amount of organic waste gas to be adsorbed and the frequency of replacement. According to the carbon tetrachloride adsorption rate, the minimum loading of activated carbon can be calculated according to the content of VOCs in the raw materials.
At present, the activated carbon adsorption method is a mature and effective technique for treating painted paint exhaust gas. In the actual operation process, the purification effect is closely related to the type of activated carbon, activated carbon loading, exhaust gas composition and other factors. The activated carbon, reasonable verification of the amount of activated carbon, cooling the exhaust gas, dehumidification pretreatment and other optimization, can improve the purification effect. Currently, uv photocatalytic technology, low temperature plasma decomposition, zeolite runner concentration and other VOCs treatment technology in the auto repair industry The promotion and application, the combination of these technological processes and activated carbon adsorption will be the development direction of organic waste gas treatment in the future auto repair industry.
