VOC exhaust gas treatment methods and advantages and disadvantages

Introduction of VOC exhaust gas treatment methods and advantages and disadvantages

Thermal combustion method: Organic exhaust gas and fuel gas are fully mixed at high temperature to achieve complete combustion. Applicable to the treatment of high-concentration, small-volume flammable gas, high purification efficiency, organic waste gas is completely oxidized and decomposed

Disadvantages: the equipment is easy to corrode, the processing cost is high, and secondary pollution is easy to form

Catalytic combustion method: Under the action of a catalyst, the hydrocarbons in organic waste gas are rapidly oxidized into water and carbon dioxide at a lower temperature to achieve the purpose of treatment.

Disadvantages: The catalyst is susceptible to poisoning and high input cost. Absorption method: The organic waste gas is easily soluble in water, and the waste gas is in direct contact with water, so that it dissolves in water to achieve the effect of removing waste gas. It is suitable for organic gases with water-soluble and organized emission sources. The process is simple, the management is convenient, the equipment operation cost is low, and the disadvantages are: secondary pollution occurs, and the washing liquid needs to be treated; the purification efficiency is low

Adsorption method: The use of adsorbents to adsorb organic waste gas is suitable for the treatment of low-concentration organic waste gas. High purification efficiency and low cost.

Disadvantages: regeneration is difficult and requires constant replacement; biological method: the life process of microorganisms is used to decompose the gaseous pollutants in the exhaust gas into less or even harmless substances. There are a variety of microorganisms in nature, and almost all inorganic and organic pollutants can be converted. Biological treatment does not require regeneration and other advanced treatment processes. Compared with other purification methods, it has the advantages of simple equipment, low energy consumption, safety and reliability, and no secondary pollution, but it cannot recycle pollutants.

Low-temperature plasma technology: During the process of dielectric barrier discharge, particles with high chemical activity, such as electrons, ions, free radicals, and excited molecules, are generated inside the plasma. Pollutants in the exhaust gas react with these active groups with higher energy, and are finally converted into substances such as CO2 and H2O, so as to achieve the purpose of purifying the exhaust gas.

It has a wide range of applications and high purification efficiency, and is especially suitable for multi-component malodorous gases that are difficult to handle in other methods, such as chemical and pharmaceutical industries. The electron energy is high, which can interact with almost all malodorous gas molecules; the running cost is low; the response is fast, the equipment starts and stops very quickly, and it is opened as needed.

Disadvantages: high one-time investment and hidden safety hazards. Introduction to UV photocatalytic oxidation: UV photooxidation treatment technology is a special treatment method that uses special ultraviolet band (C-band) and breaks down waste gas molecules under the action of special catalytic oxidants. Exhaust gas molecules first pass through special bands of high-energy ultraviolet light to break up organic molecules and break their molecular chains. At the same time, by decomposing oxygen and water in the air, high-concentration ozone is obtained. Ozone further absorbs energy to form free hydroxyl groups with higher oxidation performance. Oxidation Exhaust molecules. At the same time, a variety of composite inert catalysts are configured according to different exhaust gas components, which greatly improves the speed and efficiency of exhaust gas treatment, thereby achieving the purpose of purifying exhaust gas. No shortcomings were found.

The voc online monitor briefly describes VOCs as a collective name for volatile organic compounds, mainly including non-methane total hydrocarbons (alkanes, olefins, alkynes, aromatic hydrocarbons), oxygen-containing organic compounds (aldehydes, ketones, alcohols, ethers, etc.), halogenated Hydrocarbons, nitrogen compounds, sulfur compounds, etc. Because VOCs are volatile and lively, they can participate in atmospheric photochemical reactions to produce harmful substances, causing great harm to the environment and humans. There are two sources of VOCs, natural and man-made. Anthropogenic sources are mainly industrial emissions and domestic emissions. The main sources of domestic emissions are automobile exhaust, home decoration, straw burning, and kitchen soot; more than half of the sources are industrial emissions. Industries that emit more VOCs include petrochemicals, packaging and printing, pharmaceuticals, and automotive spraying. Organic waste gas control technology can be divided into source reduction technology, process control technology and end treatment technology.