Introduction of organic VOCs waste gas treatment methods in the chemical industry
VOCs emitted from the chemical industry not only emit large amounts of emissions, but also have complex organic components. Most of the industrial waste gas has a certain amount of toxic, combustible gas and foul odor. It is possible that some industrial waste gas may also cause hidden dangers to the ozone layer, leading to ecological balance. Therefore, it can be seen that the treatment of VOCs waste gas in the chemical industry is extremely important.
At this stage, my country's treatment of VOCs includes activated carbon adsorption, absorption, condensation, thermal decomposition, catalytic combustion devices, and incineration treatment. The key to the choice of the treatment method lies in the chemical properties, physical factors, emissions, emission standards, organic waste gas concentration and the economic value of the collection of industrial waste gas.
1. Activated carbon adsorption method
Activated carbon adsorption method is mostly used in the purification and treatment of VOCs or organic solutions emitted by chemical industries such as spraying, plastics, paint coatings, rubber and other chemical industries. Most companies use activated carbon for gas adsorption. Activated carbon adsorption device is suitable for waste gas purification of industrial waste gas containing carbon tetroxide and styrene, and is mostly used in spraying, packaging and printing, spraying production and manufacturing, paint and coating production and other fields.
10.jpg Activated carbon box
The activated carbon adsorption method of exhaust gas treatment equipment uses the micropores inside the activated carbon to concentrate one or several components in the exhaust gas on the solid surface, thereby separating it from other components. For the treatment of volatile organic components, activated carbon adsorption is an economical and effective process. It has high adsorption efficiency and a wide range of applications. Exhaust gas treatment, but the activated carbon regeneration process is more complicated and the investment is higher.
2. Absorption method
The applicable absorption method in the production and manufacturing of the chemical industry is mainly the chemical absorption method. The main equipment is that the spray tower adopts the corresponding absorbent to fully contact the industrial waste gas of the chemical industry. The absorbent absorbs the harmful gases of the industrial waste gas and then purifies the waste gas. For example, water is required to absorb formaldehyde-containing waste gas from a synthetic resin plant; sodium hydroxide solution is used to circulate and absorb phenol-containing industrial waste gas in the production of sulfonated phenol; alkalinization absorption liquid is required to collect phenol; water and alkaline solutions are required to absorb chlorohydrin epoxy The waste gas from the hypochlorite tower in the production of propane and the collection of propane.
Spray tower
Three, condensation method
This method is to increase the gas pressure difference or reduce the heat of the industrial waste gas, so that a part of the harmful gas that is easily condensed in the industrial waste gas of the chemical industry is condensed into droplets and extracted from the industrial waste gas.
Fourth, the combustion method
Excessive organic air pollutants and malodorous compounds are contained in the industrial waste gas emitted during the processing of the chemical industry, which can be treated by the catalytic combustion device method or the direct combustion method. It must be noted that the intermediate products produced in the combustion process may have more hidden dangers than the original air pollutants. Therefore, it is necessary to grasp the heat of combustion and the length of time to ensure complete combustion.
The catalytic combustion device method uses a catalyst to completely burn the organic VOCs exhaust gas in the chemical industry at a lower heat (200~500℃); the direct combustion method usually uses an incinerator for treatment, but the direct combustion method consumes more fuel and is only used For the treatment of industrial waste gas with high combustion value.
The above is the introduction of the four organic VOCs waste gas treatment methods in the chemical industry. After reading it, you should have an understanding of the methods of VOC waste gas treatment. If you need to know more about it, you can contact Xicheng Environmental Protection Technology Co., Ltd., we will provide you with professional VOCs Exhaust gas treatment solutions.