VOCs (volatile organic chemicals) removing technology of automobile painting industry

Abstract

The invention provides a VOCs (volatile organic chemicals) removing technology of an automobile painting industry. The VOCs removing technology of the automobile painting industry is applicable to removing of VOCs in painting exhaust gas of the automobile industry, the steamer industry, the packing industry and other industries. The technology is characterized in that fine powdered coal, clean water and filtrate of a pressure filter are mixed in a stirring sizing mixing barrel, and the pH is regulated; the fine powdered coal is fed into a flotation column; the painting exhaust gas is introduced into the flotation column through a bubble generator; the exhaust gas and the coal slurry are subjected to pollutant dissolving, absorbing and purifying in a pipeline and the flotation column, thus the pollutant-absorbed fine coal slurry and the purified gas can be obtained; the VOCs-absorbed fine coal slurry is dehydrated to be used as fuel; the dehydrated filtrate is returned into the sizing mixing barrel for recycling; the purified gas is directly exhausted or conveyed into the subsequent treatment process; the removing rate of the VOCs in the treated painting exhaust gas reaches 60-75%; the pollutant-absorbed powdered coal is used for combustion. Therefore, the harmless treatment of pollutants and the utilization of an absorbent without value reduction can be achieved. The technology is high in treatment efficiency, low in operation cost, simple and convenient to operate, and obvious in economic benefit.

Description

technical field [0001] The invention relates to a process for removing VOCs, in particular to a process for removing low-concentration VOCs in the automobile painting industry. Background technique [0002] With the rapid development of the automobile industry, the number of automobiles in my country has increased rapidly, and the automobile painting industry has also developed rapidly. Automobile painting operation is a key pollution link in the automobile manufacturing industry. During the operation process, a large amount of volatile organic compounds (VOCs), including benzene series (such as toluene, xylene), alcohols, esters, ketones and other organic pollutants will be produced. . These pollutants are extremely harmful to human health, and some of them have strong carcinogenic effects, so they need to be treated to meet the standards before they can be discharged. In the traditional car spraying section, the car body enters the paint spraying room, leveling room and ...

AI Technical Summary

Problems solved by technology

[0003] Adsorption-desorption-catalytic combustion method and activated carbon adsorption method are common methods for treating low-concentration VOCs spray paint exhaust gas, but these two methods have problems such as high investment cost, complicated operation, and high maintenance cost, which affect their practical application

At present, most enterprises directly discharge this part of the exhaust gas, causing a large amount of VOCs to enter the atmosphere, causing great harm

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