With the worsening domestic air pollution problem, the implementation plan of "Action Plan on Prevention and Control of Air Pollution" has been promulgated in all parts of the country. VOCs emission charges are levied on chemical companies. As the main source of VOCs, chemical companies also become the focus of exhaust gas treatment technology focus. According to the relevant investigation and research, the emissions of chemical companies (organic chemicals, fine chemicals and other enterprises) in the sources of VOCs rank the first among the industrial sources of industrial VOCs emissions. There are two main forms of VOCs in chemical industry: First, emissions generated in the production process, emissions of pollutants in the gas and chemical production processes and process conditions related to the conditions of a wide range of different types and large, the emissions of organized, emissions can be estimated. The second is through other parts of the volatile generated VOCs because of its strong diffusion and reactivity, under certain conditions, after a variety of complex chemical reactions into the form of such forms of VOCs emissions can not be accurately estimated, Analysis of the source of production is also difficult. Chemical Industry VOCs governance four new technologies The current methods of treatment of VOCs can be divided into two categories, one is recycling technology, the other is the destruction of technology. The core idea of ​​recovery technology is to first absorb, filter and separate the VOCs generated in the chemical industry, and then carry out purification and other treatment, and finally start the resource recycling. The traditional recovery technologies include: absorption technology, adsorption technology and membrane separation technology . Destruction technology is through different chemical reactions, the VOCs into other non-toxic substances discharged to achieve the purpose of emission reduction. Traditional destruction techniques mainly refer to combustion techniques. New technologies developed in recent years include leak detection and repair (LDAR) technology, plasma technology, biotechnology and photocatalysis. Leak detection and repair technology Leak Detection and Repair (LDAR) technology can be used in the management of unorganized emissions of VOCs in chemical companies. The technology is implemented at ambient temperature and uses fixed or mobile detection equipment (including photoionization, non-dispersive infrared, etc.) for chemical companies During production, equipment or space sources that may generate VOCs leaks are regularly monitored to confirm that there is a leak and finally the environmental impact caused by the leakage of raw materials can be controlled by repairing leaks beyond a certain concentration. The process of expanding LDAR technology includes: Determine the needs of the analysis, the preparation of programs to determine the allowable leakage and leak detection frequency; Undertake quantitative and qualitative testing; Expand the leakage point repair and repair testing, and make the final assessment. Low temperature plasma technology Low temperature plasma technology is another new technology of VOCs developed in recent years. The main principle of low temperature plasma treatment of VOCs is to use the plasma produced by dielectric discharge to repeatedly bombard the gas molecules in the exhaust gas at high electric field intensity to deactivate, ionize and crack various components in the exhaust gas at a high electric field intensity , Destroy the structure of VOCs molecules. A series of complex chemical reactions, such as oxidation, transform complex macromolecular pollutants into some small molecule safe substances, such as CO2, H2O, CO and NO2; or convert toxic and harmful substances into non-toxic and harmless substance. Low-temperature plasma technology low power consumption, the device is simple, easy to operate, small footprint, easy to use, in recent years has been rapid development. Catalytic oxidation technology The working principle of catalytic oxidation is that VOCs react with carbon dioxide and water under the environment of 250-450 ℃ and the relevant catalysts to achieve the purpose of VOCs treatment. Photocatalysis refers to the light in the semiconductor conditions, when the photon energy is higher than the absorption threshold of the catalyst, the semiconductor valence band transition from the valence band to the conduction band, resulting in photo-generated electrons and holes, followed by air in the nano The surface of particles form superoxide anion, and finally the hydroxyl radicals formed on the surface of the catalyst will convert volatile organic compounds into carbon dioxide and water, non-toxic and harmless substances. Biological treatment technology Biological treatment technology was first applied to the exhaust gas deodorization, and with the continuous research of VOCs treatment technology, the technology has been gradually applied to the field of volatile organic pollutants. The principle of biological treatment technology is that the waste gas generated in the chemical industry flows through an absorption device with a liquid absorbent. The device is cultivated with domesticated special microorganisms that can catabolize the exhaust gas so as to achieve the purpose of waste gas treatment. The biological treatment technology is divided into biological washing technology, biological filtration technology and biological trickling filtration technology according to the technology department, and the corresponding treatment devices are a biological scrubber, a biological filter tank and a biological trickling filter tower, respectively. Treatment options should be flexible VOCs in different chemical companies composition, concentration and gas flow are different, so the choice of treatment technology to be flexible use. Moreover, the VOCs produced by the chemical industry in the production process are all discharged as a mixture. Therefore, the combined treatment technology can not only achieve the discharge of pollutants but also reduce the pollution treatment costs. Photocatalytic oxidation technology is the most concerned technology for the purification of volatile organic compounds in space. It can decompose organic pollutants by ultraviolet light at room temperature and convert it into non-hazardous carbon dioxide and water. Plasma technology can be combined with catalysis, which can greatly improve the removal efficiency of VOCs, Psa Oxygen Generator,Oxygen Generator Portable,Oxygen Generator Cylinder Filling,Oxygen Generator For Home Jiangsu Minnuo Group Co.,Ltd , https://www.mingngroupcn.com