VOCs are a type of exhaust gas that poses a serious hazard to the environment and humans. Atmospheric pollution is one of the most prominent environmental problems in China. Industrial waste gas is the main source of atmospheric pollutants.

 

        Actively respond to the environmental protection department's call for waste gas pollutants such as benzene, toluene, hydrogen chloride and sulfuric acid mist generated during the production process. The existing waste gas treatment facilities of the project can only meet the requirements of some organized waste gas treatment, and the collection and disposal of unorganized waste gas fails. Full coverage. In order to further improve the environmental protection of the project, we will conscientiously implement the national guidelines and normalization of environmental protection, protect the physical and mental health of the production workers and the quality of the surrounding environment, and minimize the impact on the surrounding environment.

 

        Industrial waste gas, oil and gas recovery, VOCS gas condensation recovery device is generally used for hydrocarbons, aromatics, alcohols, ethers, ketones, esters and other gases, it is condensed VOSC gas, (cold box heat transfer medium heat exchanger ) The heat is transferred to the refrigerant and then cooled. By using the difference in saturated vapor pressure at different temperatures of the material, the oil and gas are supersaturated by condensation to be directly condensed into a liquid state, and a small part of the gas enters the subsequent unit for reprocessing. . For the recovery of solvent gas, it can meet the environmental emission standards of tail gas according to the demand; if the gas has low-boiling gas, the process of adsorption treatment is separated and treated again, so that the emission gas meets environmental protection requirements. .

Condensation recovery method and principle:

 

        The condensation method is to directly introduce the exhaust gas from industrial production into the condenser, and recover the valuable organic matter through the functions of adsorption, absorption, analysis and separation, recover the waste heat of the exhaust gas, purify the exhaust gas, and make the exhaust gas meet the discharge standard. When the concentration of organic waste gas is high, the temperature is low, and the air volume is small, the condensation method can be used for purification treatment, which is generally applied to pharmaceutical and petrochemical enterprises. One or more other organic exhaust gas purification devices are usually installed behind the condensing recovery unit to achieve the target emission. The volatilized vocs gas is introduced into the equipment cold box (the device is set to a condensing temperature of 5 ° C - 45 ° C - 80 ° C - 120 ° C). Other temperature zones can be customized, and gradual condensing and liquefaction recovery is carried out according to requirements.

 

        Condensation principle: the high-temperature and high-pressure refrigerant gas discharged from the compressor when the compressor refrigeration-refrigeration system is working enters the condenser and is condensed into a high-pressure supercooled liquid, which is throttled and depressurized by the expansion valve to become a low-temperature low-pressure vapor-liquid two-phase mixture. Entering the evaporator {first-order heat exchanger, second-stage heat exchanger, third-stage heat exchanger), the refrigerant absorbs the heat of the heat-transfer medium passing through the evaporator to self-vaporize, and the refrigerant is fully vaporized and then The compressor draws into the compression chamber and enters the lower cycle.

 

        The low temperature brine medium is transported to the vocs gas condensing cold box by a circulation pump to exchange heat with the vocs gas. The whole system continuously circulates through the above process, thereby achieving the purpose of continuous cooling and liquefaction recovery of vocs gas. The vocs gas condensation-gas is cooled in the condensing unit heat exchanger {ie: cold box heat transfer medium heat exchanger), and the temperature is cooled by using the difference in saturated vapor pressure of the material at different temperatures. The oil and gas are supersaturated and condensed into a liquid to be directly recovered, and a very small portion of the gas enters the subsequent unit for reprocessing.

 

        Industrial waste gas, oil and gas recovery, VOCS gas condensation recovery device Uses: For industrial waste gas, oil and gas recovery, vocs gas single material or multi-material condensation recovery.

1. Hydrocarbons such as gasoline, crude oil, fuel oil, kerosene, diesel oil, heavy oil, mixed hydrocarbons, etc.

2. Aromatic: benzene, toluene, xylene, styrene, naphtha, etc.

3. Alcohols, ethers, ketones, esters, etc.;

 

Industrial waste gas, oil and gas recovery, VOCS gas condensation recovery device use place:

 

First, the classification of common organic waste gas

        VOCs (Volatile organic compounds), a common class of atmospheric pollutants, are produced in the paint production, chemical fiber industry, metal coating, chemical coatings, shoe-making, plywood manufacturing, tire manufacturing and other industries. Harmful volatile organic compounds mainly include acetone, toluene, phenol, dimethylaniline, formaldehyde, n-hexane, ethyl acetate, ethanol and the like.

Volatile organic waste gases (VOCs) in industrial enterprises are classified according to the source of production, mainly in the following categories:

 

1. Paint exhaust gas: The main components are volatile organic compounds such as acetone, butanol, xylene, toluene, ethyl acetate and butyl acetate. They are mainly produced in surface treatment enterprises such as paint spraying. Common treatment methods include oil curtain absorption. The water curtain absorbs, and then cooperates with the second and third grades of activated carbon adsorption.

2. Plastic and plastic waste gas: The main component is polymer monomer which is volatilized during the thermal processing of plastics, plastics, etc. Due to the complex composition of plastic and plastic, the exhaust gas mainly contains ethylene, propylene, styrene, acrylonitrile and An olefin plastic polymer monomer such as butadiene, but the concentration is generally low and the air volume is large. The enterprises involved mainly include plastic granulation enterprises, chemical fiber production enterprises, injection molding enterprises, rubber production enterprises, etc. The treatment methods mainly include activated carbon absorption and plasma purification.

3. Stereotypes: The main components are aldehydes, ketones, hydrocarbons, fatty acids, alcohols, esters, lactones, heterocyclic compounds, aromatic compounds. The enterprises involved are mainly dyeing and finishing enterprises and chemical fiber production enterprises, usually adopting water spray treatment technology and electrostatic adsorption treatment technology.

4. Chemical organic waste gas: It is mainly produced by chemical enterprises. The waste gas components have a great relationship with the chemical products designed and produced by chemical companies. Generally, the purification and collection methods such as condensation recovery and catalytic combustion technology are adopted.

5. Printing exhaust gas: The main components are toluene, non-methane total hydrocarbons, ethyl acetate, ethanol, etc. which are volatilized in the ink. The enterprises involved are mainly enterprises with ink printing processes, mainly such as packaging products, printing and other companies, generally using activated carbon adsorption.

6, vocs organic waste gas mainly from the chemical industry in the production process of exhaust emissions printing and other industries related to petroleum and chemical industry. Volatile organic compounds in organic waste gas are called VOCs (Vlatile organic compounds). In many industries of coating, printing, shoemaking and chemical production, some industrial products have a large amount of volatile organic compounds (VOCs) in the production process. Discharge.

7, VOCs main components of benzene, acetone, ethyl acetate, phenol, dimethyl sulfide, thiophene, methyl mercaptan, carbon disulfide, amide and so on.

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