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Introduction and comparison of waste gas treatment process and how to choose

Views:1     Author:autower     Publish Time: 2019-08-30      Origin:http://www.autower.cn/

Introduction and comparison of waste gas treatment process and how to choose

  Nowadays, the degree of industrialization is getting higher and higher. When liberation increases productivity, it also brings a lot of industrial waste gas. These exhaust gas components are complex and difficult to quantify qualitatively and quantitatively, and are generally classified as volatile organic compounds. Volatile organic compounds are commonly referred to as VOCs, and sometimes expressed as total volatile organic compounds (TVOC) in the form of evaporation at ambient temperature in the air. Its toxicity, irritation, carcinogenicity and special odor can affect the skin and mucous membranes. This has caused damage and impact on the human body. Therefore, environmental issues and waste gas treatment have become one of the focus issues of daily attention.

  Exhaust gas treatment is a very systematic and very professional work. It is not only without the smell of pungent odor, but also meets the national and local environmental protection requirements. Nowadays, the environmental protection requirements are becoming more and more strict, and the environmental protection enterprises and environmental protection equipment have been tested. Now there are several processes for waste gas treatment:

  1. Oxidation combustion method, mainly based on catalytic combustion and heat storage combustion.

  2. Low-temperature condensation method, large-area application in oil and gas recovery and other fields.

  3. Activated carbon adsorption method, a wide range of uses.

  4. Chemical washing method.

  5. Photooxidation of plasma by oxygen.

  6. There are many processes for the treatment of waste gas such as biological bacteria solution. How to choose one is suitable for you, and energy-saving is the key.

  Catalytic combustion is a very hot term in the environmental protection industry. Catalytic combustion has the advantages of high processing efficiency and large amount of equipment exhaust gas treatment. The catalytic combustion device is suitable for large air volume and low concentration of organic waste gas. Now it is widely used in spray booths and filling workshops. Such as volatile places, but catalytic combustion can not deal with organic waste gas containing chloride, after combustion will produce helium or dioxins, higher concentration of exhaust gas will cause the adsorption time to become shorter, the risk of high concentration during combustion and other safety hazards . The low-temperature condensing equipment is just the opposite. It is suitable for high-concentration and low-volume organic waste gas. The higher the concentration, the easier it is to condense and separate. It achieves the purpose of recovery and treatment, good condensing safety, high purity of condensed and recovered organic matter, and continues to be used after recycling. Exhaust gas can be treated to tap potential and increase efficiency for enterprises. Nowadays, large-scale use in oil and gas tank areas, chemical storage tank exhaust gas, gas station oil depots, etc., low temperature condensation also has disadvantages. When the concentration is low, the condensation temperature is reduced, and the pursuit is blindly pursued. Low concentration will result in high energy consumption and uneconomical operation. Therefore, low-temperature condensation is generally used in combination with activated carbon adsorption and desorption, which not only ensures high-efficiency treatment and recovery, but also reduces the power consumption of activated carbon adsorption.

  Activated carbon adsorption is a very common adsorption material. It has the advantages of strong adsorption capacity, cheap materials and simple process. However, the adsorption capacity of activated carbon is small and it is easy to be saturated. It needs to be combined with activated carbon desorption regeneration process to ensure the treatment effect of exhaust gas. It adopts two methods of steam desorption and pressure desorption, and cooperates with PLC automatic control system to realize unattended automatic operation. The use cycle of activated carbon is generally about one year. The replaced activated carbon is dangerous and must be treated by qualified processing mechanism. The overall activated carbon waste gas treatment equipment is an effective way of low investment, low operating cost and suitable for low concentration exhaust gas treatment.

  The chemical washing method utilizes the water solubility of organic substances in the exhaust gas, and the organic substances are dissolved in water to realize the treatment of the exhaust gas. This method is very suitable for easily soluble substances such as alcohols, aldehydes, acids, etc. If the exhaust gas is acidic, a certain concentration of alkali liquor can be used. Washing, ensuring the effect can also neutralize the exhaust gas, and it is often used in the exhaust gas, and often combined with the turbidity tower to remove dust.

  Photocatalytic oxidation of photo-oxygen is suitable for exhaust gas such as malodor. It uses a covalent bond to lower the chemical bond energy of the exhaust gas. The photo-oxygen plasma uses ions from high-voltage electrodes to emit ions and electrons, destroys the principle of malodor and organic molecular structure, and bombards the odor and organic molecules in the exhaust gas. Therefore, the odor and organic molecules are cracked and decomposed into carbon dioxide, water and other compounds for deodorization and purification. However, the photo-oxygen plasma equipment has low processing efficiency, and the general efficiency is about 30%, which is suitable for the concentration of malodorous gas, and the plasma device exists. Certain safety hazards must be used with caution when exhausting gas.

  Biobacterial method, which uses the life process of microorganisms to decompose gaseous pollutants in exhaust gas into less or even harmless substances. Since the process of transforming harmful substances in the exhaust gas by the microorganisms is difficult to carry out in the gas phase, the gaseous pollutants in the exhaust gas are first transferred to the mass transfer process in the liquid film of the liquid phase or the solid surface through the gas phase, and then the pollutants are in the liquid. The phase or solid surface is degraded by microbial adsorption. Therefore, the biological bacteria solution method is cumbersome for the exhaust gas treatment process, and the biological bacteria have different effects on the different treatments of organic substances, and the treatment effect on the benzene substances is better. The biological bacteria solution method is not suitable for waste gas treatment, because the biological bacteria solution method is cumbersome for the waste gas treatment process, and the investment is large, and the living environment is required to be high.

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