How to deal with VOC exhaust gas? What are the specific methods? Can it be explained in detail?

Hello, the common organic waste gas classification VOCS (Volatile Organic Compounds) is volatile organic compounds. It is a common type of air pollutant that produces in paint production, chemical fiber industry, metal coating, chemical coatings, shoe making, plywood manufacturing manufacturing , Tire manufacturing and other industries. Harmful volatile organic compounds mainly include acetone, titohopine, phenol, di methane, formaldehyde, orthopatane, ethyl acetate, ethanol, etc. Volatile organic exhaust gas (VOCS) in industrial enterprises is divided according to the source, mainly in the following:
1. Spray paint exhaust gas: The main ingredients are acetone, butanol, methane, ethyl acetate, acetate, etc. Volatile organic compounds are mainly produced in surface treatment enterprises such as paint spraying. Common treatment methods include curtain absorption, water curtain absorption, and combined with second- and third -level activated charcoal adsorption.
2. Plastic, plastic exhaust gas: The main components are polymer monitors vulnerable during the heating process of plastic, plastic and other particles. Due to the complicated components of plastic and plastic components, the exhaust gas mainly contains ethylene, acrylic, 苯,,,,, ingunlene,,,,, ingunlene,,,,,, ingylene, lynhylene,,,,, 苯,,,,, 苯,,,,, lynhylene, ingunlene,,,,, ingun,,,,, ingun,,,, Plastic polymer monitors such as acrylite and butadiene, but the concentration is generally low and the air volume is large. Enterprises include plastic granules, chemical fiber production enterprises, injection molding enterprises, rubber manufacturers, etc. The main methods include activated carbon absorption and plasma purification.
3. Format exhaust gas: The main component is its main component, aldehyde, ketone, hydrocarbon, fatty acid, alcohol, ester, lactone, hybrid compound, aromatic compounds. The enterprises involved are mainly dyeing enterprises and chemical fiber production enterprises. They usually use water spray treatment process and static adsorption processing process.
4. Chemical organic exhaust gas: It is mainly discharged by chemical enterprises. The types of chemical products designed and produced by exhaust gas ingredients have a large relationship with the types of chemical products. They generally use condensate recycling and catalytic combustion technology and other purification collection methods.
5. Printing exhaust gas: The main ingredients are toluene, non -methane total hydrocarbons, ethyl acetate, ethanol, etc. The enterprises involved are mainly enterprises containing ink printing processes, mainly such as packaging products, printing and other companies. Generally, activated carbon adsorption is generally used.

Sugs given by common VOC organic exhaust purification treatment methods:
If priority to choose high -safety, second -time, less consumption and secondary contamination method, full selection Use the remaining heat of exhaust gas to realize the recycling of resources. Under normal circumstances, due to the particularity of their production activities and high exhaust concentrations, petrochemical companies are mostly used to purify the methods such as condensation, absorption, and combustion. The exhaust concentration of the printing industries is low. Most of the activated carbon adsorption, catalytic combustion and other methods are used for exhaust gas purification treatment. The following methods are briefly summarized:
1. The condensation recycling method is the exhaust gas of industrial production production. Introduce directly to the condenser, after the role and response of adsorption, absorption, analysis, separation, etc., recover valuable organic matter, recycle the waste heat of exhaust gas, purify the exhaust gas, so that the exhaust gas meets the discharge standards. When organic exhaust gas concentration is high, the temperature is low, and the air volume is hour, the condensation method can be used for purification treatment, which is generally used in pharmaceutical and petrochemical enterprises. Usually, other organic exhaust gas purification devices of first or more levels of organic exhaust gas are also installed behind the condensed recycling device to achieve standard discharge.
2. Most of the physical absorption method in the production of absorption method is to introduce the exhaust gas into the absorption solution for absorption and purification. In the case of low concentration, low temperature, and high air volume, you can step on the absorption method, but it is necessary to be equipped with heating analysis and recycling device, and the investment amount is large. The method of absorbing paint fog commonly used by paint -coating operations enterprises, which is commonly used, is the common organic waste gas absorption method.
3. Direct combustion method Direct combustion method is to use auxiliary materials such as gas to ignite the exhaust gas, which prompts the harmful substances to transform into harmless substances under high temperature combustion. The exhaust gas with small air volume, but its safety technical requirements are high.
4. The catalytic combustion method is catalyzed. This method is suitable for the purification treatment of organic exhaust gas with high temperature and high concentration. It has the advantages of low combustion temperature, energy saving, high purification rate, and small area, but the investment is large.
5. Adsorption method can be divided into three types: a. Direct adsorption method, using activated carbon to adsorb and purify the organic exhaust gas, the purification rate can reach more than 95%. Replace activated carbon, frequent loading and unloading, replacement and other procedures increase the operating costs. B. Adsorption-recycling method. Use fiber activated carbon to attach organic waste gas to make it overheating steam anti -blow blowing in the state of saturation and achieve removal of regeneration. C. New adsorption-catalytic combustion method. The method of comprehensive adsorption method and catalytic combustion method has the advantages of stable operation, low investment, less operation costs, and simple maintenance. It uses the new adsorbing material to adsorb the organic exhaust gas to adsorb, so that it adsorbs, analyze, and attach it under the action of thermal air under the action of saturation, and then introduces the exhaust gas into a catalytic combustion bed for flameless combustion treatment to achieve thorough exhaust gas. Purification. This method is suitable for the low concentration and large wind gas purification treatment. It is the most current domestic application method.
6. Low -temperature plasma purification method Low -temperature plasma is the fourth state after solid, liquid, and gaseous. When the outer voltage reaches the gas discharge voltage of the gas, the gas is cut through, which produces electronics, various ions, atoms, atoms And the mixture including free radicals. Although the electron temperature is very high during the discharge process, the temperature of the heavy particles is very low, and the entire system is low -temperature, so it is called a low -temperature plasma. Low -temperature plasma degradation pollutants use these high -energy electronics and free radicals to decompose pollutants molecules in a very short period of time, and subsequent reactions occur to achieve the purpose of degradation pollutants. The traditional processing method of volatile organic pollutants (VOCS), such as absorption, adsorption, condensation, and combustion, it is difficult to achieve low -concentration VOCs, and photocatalytic degradation VOCS has the problem of being easily damaged by catalysts. VOCS can be unlimited by the above conditions and has potential advantages. However, because plasma is a cross discipline that contains basic disciplines such as discharge physics, discharge chemistry, chemical response engineering and vacuum technology. Therefore, there are very few units that can be mature at present. Most of the propaganda use of low -temperature plasma technology to treat exhaust gas is not a real low -temperature plasma waste gas treatment technology.
The summary of different organic exhaust ingredients and concentrations applicable to different organic exhaust gas treatment methods. At present, comprehensive technical maturity, economy, and equipment maintenance, the most widely used is activated carbon suction attachment. However, the activated carbon adsorption method has the shortcomings such as the application period of the applicable period of abolition of activated carbon-remove recovery and the existence of pollution transfer. Therefore, the new adsorption-catalytic combustion method has been commonly used in technical reforms or new projects. The low -temperature plasma purification method is favored by more and more enterprises due to the advantages of low maintenance costs in the later period, but there are also issues such as high investment costs. It is believed that with the development of technology and industry, low -temperature plasma purification technology will become more and more mature, equipment investment will also decline, and it will be widely used by then.
It hope it will be helpful to you ~

The processing method of VOCS is as follows:
one is to cover up the dilution method. As the name suggests, the diluted dilution is to use other smells to cover up the boring and discomfort in the exhaust gas to achieve the purpose of deodorizing; while the dilution is diluted by druming the odor with higher concentration until the human body is passed through the human body until the human body is passed through the human body until the human body is passed through the human body It is difficult to notice the senses. This method is essentially the negative effect of eliminating odor from the level of sensory experience, but the odor factors that cause stench still exist.
The second is the absorption method. This is also one of the technologies with the highest penetration rate and the most wide range of applicable scope of municipal and industrial deodorization. It mainly uses activated carbon and other absorbers. The porosity structure has a huge surface area and Van Dehuali. Stele factors are adsorbed to achieve the effect of separation from airflow. Although the cost of the technology industry is relatively low, the stinking ingredients have not been really removed. In the future, the attachment of attachment must be resolved and the secondary treatment is still required, and the service life is short. Essence
three is the cracking method. By decomposing and damaging the vulnerable gas molecules through various means, and directly solve the problem of exhaust gas treatment from the source of the odor. With the development of the environmental protection industry technology, the industry has been born in the industry, such as (catalytic) combustion method and high temperature cracking method (boiler rotation furnace furnace ), Chemical method (pharmaceutical spray tower or plant extract liquid spraying method), UV light solution method, (super energy) plasma method and biometrics. Among them, super -energy plasma and biometrics, as emerging application technologies for deodorizing industries, are being widely used due to the advantages of high -odor efficiency, small energy consumption, high safety coefficient, and no secondary pollution.
supermodel plasma technology to cracks the evil odor factors through the following four ways:
1) Chemical pathway, using bipolar shielding technology, at the environmental conditions of normal temperature and normal pressure, oxygen molecules can be separated into ecological atomic oxygen, and Pure ions, hydroxyl free radicals, single -line state oxygen, positive, negative charge ions and ion oxygen groups, etc. These high -oxidation, high -energy, and high -concentration ions can be oxidized with organic molecules or inorganic objects that produce odor pollution in the airflow to generate non -toxic small molecules; resulting in bacterial cell membranes and virus protein bags in the air The membrane structure changes, so that it is inactivated.
2) physical effects, under the effect of electric field generated by ion tube, after the electrons of the plasma in the electrode space obtained the energy, the speed of 3 million to 30 million times per second and non -elastic collision with odor gas molecules. Most of the molecular kinetic energy is converted into the internal energy of pollutant molecules, which trigger a series of complex physical and chemical reactions such as electrical ionization, cracking or exciting, and then degrade the pollution gas molecules into common non -toxic small molecules such as carbon dioxide and water, so as to achieve achievement Devuling.
3) The aggregation sedimentation, the dust particles passing through the electric field will bring the charge, and combine it into a larger group block under the interaction of charge, which is eventually removed by the filter or sinks with gravity, and then protects the human body from inhaled particulate matter. And the harm to carry microorganisms.
4) Keeping a healthy and happy mood, some studies have shown that nature, especially forests, wetland air environments, contain a lot of negative ions, and negative ions are closely related to human health. And effectively improve the activity of cerebral cortex, eliminate fatigue, and improve sleep.
The transformation process of biological method on foul pollutants is as follows:
① The dissolution process of evil odor gases. The waste gas and the water film on the surface of the water or solid -phase surface, the pollutants are dissolved in the water into the molecule or ions in the hydraulic, that is, the vulnerable substance is transferred from the gas phase to the liquid phase. This process is the physical process, follow the law of Henry;
② The adsorption and absorption process of vulnerable substances. The ingredients in the water solution are adsorbed and absorbed by microorganisms, and the malignant ingredients are transferred from water to microorganisms. The water of the absorbent is regenerated and recovered, and then used to dissolve the new exhaust ingredients. The adsorbed organic matter is transformed through biological transformation, that is, the dissolution of insoluble and colloidal organic objects through microorgan enzymes can be successively consumed in the body by microorganisms. Organic objects such as starch and protein, under the action of microbial cells (hydrolyzed enzymes), are hydrolyzed into small molecules before entering the cell body. It can be seen that once the surface of the microbial existence of sludge or membrane shape is covered by organic matter, the further adsorption effect will be limited, so it is necessary to update or replenish the microbial fungal gel with adsorption capacity through the surface of the membrane. In order to ensure the smooth progress of this process;
③ biodegradation process of vulnerable substances. The vicious ingredients entering the microbial cells are decomposed and used by the energy or nutrients of microorganisms, so that pollutants can be removed. The hydrocarbon and other organic components are oxidized and decomposed to CO2 and H2O, and sulfur-containing reduction components are oxidized to S, SO42-; nitrogen-containing ingredients are oxidized and decomposed to NH4 , NO2- and NO3-, etc.