How to deal with organic waste gas in the hottest

How to deal with organic waste gas in coating industry

how to deal with organic waste gas in coating industry

September 7, 2020

in recent years, the problem of air pollution has become increasingly prominent. The content of volatile organic compounds VOCs in the atmosphere is small, but it will cause great harm. It is one of the main sources of air pollution. As a large country in the production and consumption of ink and coating, the VOCs Pollution in China is very serious, and the treatment of VOCs is urgent. Next, we will introduce the organic waste gas treatment process in the ink and coating industry

organic waste gas treatment method:

1. Condensation method

condensation method is a treatment method used to recover valuable organic substances in VOCs and recycle them as resources. Using the different saturated vapor pressure of organic substances at different temperatures and pressures, some substances are supersaturated and condensed to be recovered by cooling and pressurizing. The condensation method has the advantages of high storage of materials collected by the amplifier and simple equipment and operating conditions. However, due to the need for higher pressure or lower temperature, the operation cost is too high. The condensation method is suitable for the treatment of high concentration organic waste gas

2. Absorption method

absorption method uses absorption solution cm; The principle of similar miscibility with organic waste gas can achieve the purpose of treating organic waste gas. It is suitable for the treatment of medium and high concentration waste gas, but it is difficult to choose a cheap and low volatile absorption solution, and there is a problem of waste liquid treatment, and the purification effect is not ideal

3. Regenerative oxidation method

regenerative oxidation method uses high-efficiency ceramic regenerator to store the heat generated during the decomposition of organic waste gas, and uses the heat stored by ceramic regenerator to heat the untreated organic waste gas, so as to achieve high thermal efficiency

realize the heat storage and heat release of heat storage materials through the program switching of exhaust gas flow. The heat recovery efficiency is generally more than 95%, the oxidation temperature is generally between 800 ℃ ~ 980 ℃, and the purification rate is more than 98%. It is suitable for the treatment of medium and high concentration and complex VOCs. For the treatment of organic waste gas with low concentration and large air volume, there are disadvantages of large equipment investment and high operation cost

4. Catalytic oxidation method

heat the exhaust gas to 200 ℃ ~ 300 ℃, oxidize and decompose it into carbon dioxide and water under the action of catalyst, so as to achieve the purpose of purification. It has the advantages of low ignition temperature, high purification rate, no secondary pollution, simple process, convenient maintenance, good safety and so on. This technology is suitable for the treatment of medium and high concentration organic waste gas, and the process is mature. For the treatment of organic waste gas with low concentration and large air volume, there are disadvantages of large equipment investment and high operation cost

5. Adsorption method

using adsorbents with high porosity and high specific surface area pre pressurized by water injection, VOCs gas molecules are separated from waste gas by physical adsorption (reversible reaction) or chemical adsorption (irreversible reaction). The purification rate can reach 95%. The equipment is simple and the investment is small. However, the adsorbent cannot be regenerated after it is saturated, the replacement cost of adsorbent is high, and there are problems of secondary pollution

6, adsorption Recovery method

use adsorbents such as activated carbon fiber or granular carbon to adsorb organic waste gas. When it is nearly saturated, it is desorbed and regenerated with water vapor or inert gas. The high concentration gas under regeneration is condensed and separated to recover the liquid. This technology is applicable to the treatment of organic waste gas with medium and high concentration and recycling value