Automobile Paint Room Exhaust Treatment Plan

The paint booth is a device used for painting and drying the surface of equipment. It is widely used in the painting and baking construction of workpieces in the automotive, machinery, hardware, furniture, glass steel products, chemical equipment and other industries. Due to the increasing popularity of the use, the resulting problem of exhaust pollution has begun to attract attention.

The composition of the exhaust gas generated in the paint booth is complicated and it is difficult to handle. Firstly, when the surface of the equipment is painted, paint mist and exhaust gas will be generated. When the equipment is dried after spraying, in addition to volatile components such as organic solvents, partial plasticizers or resin monomers, thermal decomposition products and reaction products are also formed. Things, the composition is more complicated.

For the treatment of the exhaust gas in the paint booth, since the particulate matter which easily damages the equipment such as paint mist is present, the exhaust gas is first subjected to operations such as paint mist and dust before the VOCs mixed exhaust gas is treated. In general, the VOCs mixed gas is mostly washed by a front spray tower.

Working principle of spray tower: The mixed exhaust gas is introduced into the purification tower by the air duct. After the filler layer, the exhaust gas and the absorption liquid are fully contacted and absorbed or chemically reacted to achieve the purpose of purification. After the exhaust gas is purified, it is dehydrated by a defogging board.

The VOCs waste gas from which the paint mist and dust are removed is subjected to the next purification treatment. The methods that can be used include:

Photocatalytic oxidation: Photocatalytic oxidation is catalyzed by external visible light. Photocatalytic oxidation is a catalyst for semiconductors and air. The light is used as energy to degrade organic matter into CO2 and H2O.

Heterogeneous Catalytic Oxidation: A collection of exhaust gas treatment technologies such as photocatalytic oxidation, UV photon photolysis, and advanced oxidants. The treatment efficiency of the organic matter can be improved, and the technology can be reacted at normal temperature and pressure, the operation cost is low, the equipment has a small footprint, and the safety performance is high.

Plasma catalytic oxidation: The organic exhaust gas is activated by plasma excitation and dissociation, and then the activated exhaust gas is subjected to catalytic oxidation reaction with oxygen in the exhaust gas through high-energy rays on the surface of the rare metal oxide, and finally converted into carbon dioxide and water.

RTO regenerative combustion: The regenerative combustion method is to completely oxidize organic molecules into carbon dioxide and water in a high temperature environment to achieve standard discharge, and has high purification efficiency.

As one of the main sources of atmospheric pollution, VOCs are not only one of the main substances forming PM2.5, but also an important precursor of ozone formation in the near-surface layer. Some environmental experts said that to solve ozone pollution, the problem of VOCs should be solved first. Therefore, the problem of VOCs has become an environmental protection issue that is urgently needed to be solved. In addition to the installation of end-of-pipe facilities and corresponding monitoring equipment for enterprises that require VOCs, the use of raw materials should be as close as possible to clean and environmentally friendly materials, and reduce VOCs emissions from the source.