The survival of human beings can not be separated from the air, and changes in the physical properties of the air and changes in the chemical composition have a direct impact on human health. In the process of painting, organic solvents evaporate and emit toxic and harmful organic waste gas. This poses a threat to enterprises and personnel. To improve the working environment and protect the health of workers, reasonable ventilation is needed. Install the necessary purification system. Spray paint organic exhaust gas treatment method has a wide variety of features, various characteristics, commonly used water spray method, condensation method, absorption method, combustion method, catalytic method, adsorption method.
1. Water spray method: The water spray process has a common application in the treatment of atmospheric pollution, and it is also used in the spraying process. For example, the water curtain cabinet is an example. The principle is to spray water through the exhaust gas and dissolve the water in the exhaust gas. Sex or large particle components settle down to achieve separation of contaminants and clean gases. The advantage is that the water resources are easily available, and can be reused after filtration and precipitation, which greatly reduces the waste of water resources. The water spray has a high efficiency in processing large particle components, and is often used as a pretreatment for exhaust gas treatment.
2. Condensate recovery method: Directly condense or condense after condensing the exhaust gas. The condensate is separated to recover valuable organics. This method is used for exhaust gas treatment with high concentration, low temperature, and small air volume. However, this method has a large investment, high energy consumption, and high operating costs. Therefore, there is no special need and this method is generally not used.
3. Absorption: can be divided into chemical absorption and physical absorption, but the "triphenyl" exhaust gas has low chemical activity and generally does not use chemical absorption. The physical absorption is the use of a liquid absorbent having a relatively low volatility. It has a high affinity with the absorbed components, and is reused after it is saturated and cooled by heating. This method is used for exhaust gas with low atmospheric temperature, low temperature, and low concentration. The device is complex, the investment is large, the selection of absorbing liquid is difficult, and there is secondary pollution.
4. Direct combustion method: Use the heat released from combustion of auxiliary fuel such as gas or fuel to heat the mixed gas to a certain temperature (700-800°C), and stay for a certain time to burn combustible harmful gas. The method is simple in technology and low in equipment investment, but it has large energy consumption and high operating costs.
5. Catalytic combustion method: The exhaust gas is heated to 200 ~ 300 °C through the catalytic bed combustion, to achieve the purpose of purification. The method has low energy consumption, high purification rate, no secondary pollution, and simple and easy operation. It is suitable for the treatment of high-temperature and high-concentration organic waste gas. It is not suitable for the treatment of organic waste gas with low concentration and large air volume.
6. Adsorption method: (1) Direct adsorption method: The organic gas directly passes through the activated carbon and can reach a purification rate of 95%. The equipment is simple, the investment is small, and the operation is convenient. However, the activated carbon needs to be frequently replaced for low concentration and the pollutants do not need to be used. Recycling occasions. (2) Adsorption recovery method: After the organic gas is adsorbed on activated carbon, the activated carbon is saturated and desorption regeneration is performed with hot air.
Henan Zhongte Environmental Protection Equipment Co., Ltd. specializes in providing combined VOCs exhaust gas treatment technologies and equipment. Committed to become a company that integrates R&D and design, equipment manufacturing, project contracting and operation management. The company has the general contracting qualification for environmental pollution control, special environmental engineering design, and a number of related patent certificates. It is a member of the Environmental Protection Association.
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