Spray paint exhaust gas: The main components are acetone, butanol, xylene, toluene, ethyl acetate, butyl acetate and other volatile organic compounds. They mainly come from surface treatment companies such as paint spraying. Common The best methods to treat spray paint exhaust gas include oil curtain absorption, water curtain absorption, and combined with two- and three-stage activated carbon adsorption towers.

1. Comparison of spray paint exhaust gas treatment methods:

1. Water Spray method: Spray paint exhaust gas treatment. Water spray technology is widely used in air pollution control. It has been used in the spray painting process, such as water curtain cabinets. The principle is to spray water on exhaust gas emissions, and water-soluble or large particles settle to achieve pollution. The purpose of separation of substances and clean gases. The utility model has the advantage of simple water resources. After sedimentation and filtration at the same time, it can be reused to reduce the waste of water resources. The water spray has a very high efficiency in processing large particles and is usually used for pretreatment of waste gas treatment.

2. Condensation method: spray paint exhaust gas treatment is directly condensed or after adsorption concentration and condensation, the condensate is recovered by separating and valuable organic matter. This method is used for high concentration, low temperature, and small waste gas treatment air volume. However, the investment is large, the energy consumption is high, and the operating cost is high. This method is generally not used to purify spray paint exhaust gas.

3 Plasma reaction method: Use plasma containing high-energy active groups to decompose exhaust gas molecules and generate carbon dioxide and water, thereby achieving the purpose of purifying exhaust gas. However, this method is not suitable for the treatment of flammable and explosive spray paint organic waste gas, as it has safety risks and the later maintenance of the equipment is complicated.

4 Direct combustion method uses oil or natural gas as auxiliary fuel to burn and heat the mixture to a certain temperature (700 ℃ - 800 ℃), and stops for some time to produce harmful gases from fuel combustion. This method has a simple process and low equipment investment, but has high energy consumption and high operating costs.

5 The catalytic combustion method uses a catalyst to rapidly oxidize hydrocarbons in organic waste gas into water and carbon dioxide under low temperature conditions to achieve the purpose of treatment. However, when used for low-concentration exhaust gas with large air volume, the cost is high and the operating cost is high.

6. Activated carbon adsorption: Directly adsorbing organic gases through activated carbon. The equipment is simple, the investment is small, and the operation is convenient, but the activated carbon needs to be replaced frequently. The equipment has large wind resistance, requires high fan pressure, and consumes large amounts of power. Replacement of activated carbon after use and subsequent processing are troublesome. After saturation, it is difficult to draw air in the spray room, which affects product quality.

7. Plant liquid gas phase chemical reaction: Use a high-efficiency spray tower to efficiently remove paint residue and paint mist in spraying exhaust gas. Using plant liquid for washing can reduce the viscosity of paint residue and paint mist and improve spray washing. The tower’s removal efficiency of paint slag and paint mist. Use a highly activated biological waste gas purification tower to ensure that waste gas indicators are discharged up to standard, remove odors in the waste gas, and reduce the impact of waste gas on the surrounding environment. Effectively remove benzene, esters, ketones, non-methane total hydrocarbons, VOC and other organic waste gases. Low cost, no safety hazards, and no secondary pollution. Recommended.