In the spray painting process of the spray painting room, it is inevitable to produce exhaust gas, not only to pollute the environment but also to damage the health of the human body. Therefore, it is necessary to deal with these waste gases. The treatment methods of exhaust gas in the spray paint house are mainly included in the following ways: breaking method, water spray method, combustion method, absorption method, condensation method, plasma low temperature urging. Chemical oxidation and adsorption. The most commonly used methods are water spray and adsorption.
Water spray method:
Water spray method is widely used. The principle of water spray is to separate the pollutants and clean gas by spraying water in the exhaust gas, water solubility or large particles settlement. Take the non pump water curtain painting room as an example, the pump free water curtain spray booth adopts air induction to raise water to form a circulating water curtain. When the workers face the surface of the workpiece to spray paint on the surface of the water curtain, the air containing lacquer mist passes through the curtain and enters the air water passage after the impact of the curtain, and produces a strong mixture with the water in the channel. When the air collector is entered, the velocity of the flow is suddenly reduced, the gas and water are separated, and the air is pumped into the activated carbon after the air baffle is passed. When the water is separated into the tank, the water flows from the spillway to the pan to form a water curtain and flow back to the water tank. In this process, the paint mist is formed into a residue to adsorb and remove the paint particles. After investigation, the efficiency of water curtain paint mist treatment system to remove particulate matter is about 70%.
A large number of particles are also contained in the exhaust gas of the paint mist treatment system treated by water curtain. In order to prevent the blocking of subsequent active carbon purification facilities, the glass fiber filter cotton should be installed at the top of the spray chamber to further remove the paint particles. Glass fiber filter cotton is also called lacquer felt, resistance paint net, lacquer cotton, glass fiber fluffy felt and paint filter net. It is made up of high strength continuous monofilament glass fiber, presenting an increasing structure, high capture rate and good isolation effect of paint fog, good compression performance, and keeping its shape constant, and its filter fiber is good for storing paint fog dust. The fogging felt filter material is green and white, the green surface is the air facing side, and the temperature resistance is strong, which can reach 100% relative temperature resistance and high temperature resistance to 170 degrees Celsius.