Waste gas treatment plan for spray booth

1. Characteristics of paint spray exhaust gas pollution:

During the painting process, a large amount of exhaust gas is generated, which can be divided into coating mist and organic exhaust gas according to whether it is particulate matter. Paint mist is the particles formed by the atomization of paint under high pressure. During painting, part of the paint does not reach the surface of the paint. The organic waste gas that forms paint mist with the airflow comes from the volatilization of the thinner, and the organic solvent will not adhere to the surface of the paint with the paint. , All organic waste gas will be released during the coating and curing process. According to literature reports, coating waste gas contains hundreds of volatile organic compounds, which belong to compounds such as alkanes, cycloalkanes, alkenes, aromatic compounds, alcohols, aldehydes, ketones, esters, and ethers.

2. The hazards of paint spray exhaust gas.

In the painting process, spray particles and other forms of organic waste gas are often produced. The waste gas contains many toxic substances. If not handled properly, it will affect people's health, pollute the environment, and cause many problems.

Studies have shown that the content of volatile organic compounds in general coatings is 0.4-1.0 mg/m3. Due to the strong volatility of volatile organic compounds, under normal circumstances, 90% of the volatile organic compounds in the paint can be volatilized within 10 hours after the application of the paint, while the volatile organic compounds in the solvent only release 25% of the total amount during the drying process of the paint. The impact of volatile organic compounds on human health is mainly to irritate the eyes and respiratory tract, cause skin irritation, headache, sore throat and fatigue, and also contain a large number of carcinogens.

3. Waste gas treatment standards for paint spray booths .

1. Meet the national emission standards, such as "Emission Standards for Odor Pollutants";

2. Local and industrial emission standards, such as "Volatile Organic Compound Emission Standards for Painting Manufacturing Industry" (DB44/814-2010);

3. Does not affect nearby residents.

The testing standards vary from place to place, so the exhaust gas treatment standards of the paint spray booth should be formulated according to the specific conditions.

Treatment method of painting exhaust gas.

Generally speaking, paint spray exhaust mainly contains volatile organic compounds and some paint mist. The paint mist is removed by dry filtration or spraying. There are many treatment methods for volatile organic compounds, such as ultraviolet light oxygen, low-temperature plasma, activated carbon adsorption, catalytic combustion and other methods.