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    Waste gas treatment equipment for cyclone plate columnChina’s VOCs emissions, an important precursor of pollution, are still on the rise, with data showing that China’s absolute VOCs

    来源:admin(传梦环保整理发布)   时间:2018-08-08

    China's VOCs emissions, an important precursor of pollution, are still on the rise, with data showing that China's absolute VOCs emissions exceed 20 million tons per year.
    In order to improve the quality of the atmosphere, China is speeding up the prevention and control of VOCs pollution. In the "13th Five-Year" program for the prevention and control of volatile organic pollutants, it is clearly proposed that by 2020, a sound management system for the prevention and control of VOCs pollution is established, and the emission reduction of VOCs pollution in key areas and key industries is reduced by more than 10%.
    In addition, the government has also introduced the VOCs emission reduction program for the local and different industries, and 21 provinces and municipalities have begun to levy pollution charges for the VOCs. The strengthening of the policy level will make the prevention and control of VOCs pollution become one of the key tasks of environmental protection work for many enterprises, and this will also lead to the explosive growth of the VOCs governance, monitoring, third party services and other markets. The related data forecast during the "13th Five-Year", the scale of the VOCs prevention and control of the market will reach 140 billion yuan. Petroleum refining and petroleum chemical industry, coal chemical industry and chemical storage and transportation are the key industries of VOCs emission. The related data show that the emission of VOCs in the petrochemical industry only reached 3 million tons per year.
    VOCs emissions from petrochemical industry can be classified into two types of organized and unorganized emissions, including twelve emission sources.
    There are many kinds of VOCs with wide sources and complex components. A single enterprise may face some problems such as lack of enthusiasm, funds and resources for prevention and control of VOCs.
    According to the relevant investigation and research, the emission of chemical enterprises (organic chemicals, fine chemicals and other enterprises) in the emission sources of VOCs ranks first in the national industrial VOCs emission sources.
    There are mainly two forms of VOCs in chemical enterprises:
    The first is the emission of waste gas produced in the production process. The pollutants in the gas discharge are related to the process of chemical production and the working conditions of the process, with many kinds and large differences in nature. This kind of emission is organized and the emissions can be estimated.
    The two is produced by other link volatilization. Due to its strong diffusivity and reactive activity, the VOCs can be transformed by a variety of complex chemical reactions under certain conditions. The emission of VOCs produced in this kind of form can not be accurately estimated, and the source analysis is also in difficulty.
    The four new technologies of VOCs control in chemical industry can be divided into two types, one is recovery technology, the other is destruction technology.
    The core idea of the recycling technology is to absorb, filter and separate the VOCs produced in the chemical industry, and then carry out purification and other treatment. Finally, the recycling technology is carried out. The traditional recycling technology includes absorption technology, adsorption technology and membrane separation technology.
    Destruction technology is through different chemical reactions, VOCs into other non-toxic and harmless substances discharged, to achieve the goal of emission reduction.
    The traditional destruction technology mainly refers to the combustion technology.
    New technologies developed in recent years include leak detection and repair (LDAR) technology, plasma technology, biotechnology and photocatalysis technology.
    Leakage detection and repair technology leakage detection and repair (LDAR) technology can be used in the management of the unorganized emission of VOCs in chemical enterprises. This technology is implemented at normal temperature, using fixed or mobile detection equipment (including photoionization, non dispersive infrared, etc.) which may produce VOCs leaks in the production of chemical enterprises. The source is regularly monitored to confirm the existence of leaked equipment, and finally to control the impact of the leakage of raw materials on the environment by repairing the leaks beyond a certain concentration.
    The process of developing the LDAR technology includes: determining the requirements analysis, making the plan, determining the leakage value and leakage detection frequency, developing the quantitative and qualitative detection, unfolding the repair and post repair detection of the dew point, and carrying out the final evaluation.
    Low temperature plasma technology is a new technology of VOCs governance developed in recent years.
    The main principle of treating VOCs by low temperature plasma technology is to use the plasma generated by the dielectric discharge to bombardment gas molecules in the exhaust gas at a very fast speed, to activate, ionize and crack various components in the exhaust gas and destroy the structure of the VOCs molecule. Through a series of complex chemical reactions such as oxidation, complex macromolecular pollutants are converted into small molecules such as CO2, H2O, CO and NO2, or toxic and harmful substances are converted to innocuous or low toxic and low toxic substances. Low-temperature plasma technology has been developed rapidly in recent years because of its low power consumption, simple device, easy operation, small area and convenient use.
    The principle of catalytic oxidation technology is that VOCs can produce carbon dioxide and water under the conditions of temperature of 250~450 C and related catalysts, and thus achieve the purpose of treating VOCs.
    Photocatalytic technology means that under the condition of light in the semiconductor, when the photon energy is higher than the absorption threshold of the catalyst, the valence band electrons of the semiconductor can jump from the valence band to the guide band, produce photoelectrons and holes, and then form superoxide anion on the surface of the nanoparticles in the air, and finally the hydroxyl group formed on the surface of the catalyst. Free radicals convert volatile organic compounds into non-toxic and harmless substances such as carbon dioxide and water.
    Biological treatment technology is the first application of biological treatment technology to waste gas deodorization, and with the deepening of research on VOCs treatment technology, this technology is gradually applied to the control field of volatile organic pollutants. The principle of biological treatment is the absorption of waste gas in a chemical industry through a liquid absorbent. In this device, a special microorganism is trained to be domesticated.

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    Zouping Shuaike Painting Purification Equipment Co., Ltd. is a subsidiary of Guangzhou Jiuhua Machinery Equipment Co., Ltd. It specializes in the design and manufacture of environmental protection painting equipment. Its main products are UV photocatalysis, spray tower, swirl tower, activated carbon environmental protection box, water curtain cabinet, central dust removal, paint baking room ass...

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