Device and method for treating VOCs waste gas through activated carbon adsorption and high-temperature desorption-catalytic oxidation

Abstract

The invention provides a device and method for treating VOCs waste gas through activated carbon adsorption and high-temperature desorption-catalytic oxidation. By limiting the input of fresh air, desorption gas circularly perform desorption on an adsorption bed, and the oxygen content of the desorption gas is gradually reduced along with a VOCs oxidation reaction, so that the desorption temperature of the adsorption bed is increased, and finally, the high desorption efficiency is achieved. The device comprises a pretreatment device, adsorption beds, an adsorption fan and a chimney which are sequentially arranged according to an adsorption sequence; the device further comprises a plurality of adsorption beds, a heater, a catalytic oxidation device, a cooling device and a desorption fan, the adsorption beds, the heater, the catalytic oxidation device, the cooling device and the desorption fan are arranged according to a desorption sequence, a nitrogen purging device and an oxygen supplementing device are arranged between the adsorption beds and the catalytic oxidation device, an oxygen content meter is arranged at an outlet of the catalytic oxidation device; an oxidation unit comprises the plurality of adsorption beds; when one of the adsorption beds is subjected to desorption operation, the other adsorption beds are subjected to adsorption operation. The device is simple to operate and control, low in operation cost and capable of realizing a high desorption effect at low cost.

Description

【Technical field】 [0001] The invention relates to the technical field of waste gas treatment, in particular to an activated carbon adsorption high-temperature desorption-catalytic oxidation device and method for treating VOCs waste gas. 【Background technique】 [0002] VOCs are one of the main air pollutants, and many industries such as chemical industry, painting, and pharmaceuticals will produce VOCs. The adsorption-catalytic oxidation method is a common method for treating industrial VOCs waste gas. This method first enriches low-concentration VOCs through adsorption, and then desorbs through hot air. The desorbed gas containing high-concentration VOCs passes through the catalyst bed to achieve low-temperature combustion purification. . Activated carbon is a commonly used adsorbent in the adsorption-catalytic oxidation method, which is simple to install, easy to use, and low in cost. When activated carbon is used as the adsorbent, the desorption temperature is generally ...

AI Technical Summary

Problems solved by technology

The desorption temperature of activated carbon is low, and after desorption, there are many residual organic substances in the activated carbon, and the overall desorption efficiency is not high, resulting in reduced adsorption activity of activated carbon and shortened service life

Setting a lower desorption temperature mainly considers the safety of the system. If the temperature is too high, the organic matter enriched in the activated carbon will be oxidized and burned, causing local overheating and even causing a fire.

At present, this problem is a common problem in the treatment of VOCs exhaust gas by activated carbon adsorption-catalytic combustion

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