A new type of activated carbon (mostly honeycomb carbon or fiber carbon) is applied to adsorb concentrated low concentration of organic waste gas, and hot air is introduced to heat the activated carbon after adsorption is close to saturation, so that the organic waste gas is desorbed into the catalytic combustion bed for flameless combustion purification treatment, and the hot gas is recycled in the system or a secondary heat exchanger is added for heat recovery. In this method, the low concentration of organic waste gas is concentrated into high concentration organic waste gas by activated carbon and then completely purified by catalytic combustion. This method absorbs the advantages of adsorption method and catalytic combustion method, overcomes the disadvantages of separate use, and is a mature and practical method for the treatment of organic waste gas in China.

Working principle of activated carbon

The waste gas containing organic matter is absorbed into the activated carbon micropore by the action of the fan and the activated carbon adsorption layer, and the clean gas is discharged by the strong adsorption capacity of activated carbon with large specific surface area. After a period of time, when the activated carbon reaches the saturated state, the adsorption is stopped, and the organic matter has been concentrated in the activated carbon. Catalytic combustion was used to desorption and regenerate saturated activated carbon and put it back into use.

The organic mixed waste gas to be treated is processed by the induced draft fan, and the dust and impurities in the waste gas are removed by the pre-treatment filter device first, otherwise the direct adsorption will block the micro-hole of the activated carbon, thus affecting the adsorption effect or even failure. After the preliminary filtration, "relatively pure organic waste gas" enters the adsorption device for adsorption purification treatment. The organic matter is trapped inside the activated carbon by the unique force, the clean gas is discharged into the atmosphere through the chimney, after a period of adsorption, the activated carbon reaches the saturated state, according to the PLC automatically

The control program alternates between the saturated activated carbon bed and the unattached activated carbon bed. The COCTO automatic heating will send hot air through the fan into the activated carbon bed to raise the carbon layer

Temperature will "steam" organic matter from the activated carbon, and the desorbed exhaust gas belongs to high concentration, small air volume and high temperature organic waste gas.