Device and process for recycling volatile organic gas in adsorption-desorption manner

Abstract

The invention discloses a device for recycling a volatile organic gas in an adsorption-desorption manner and a utilization method of the device. The device comprises activated carbon fiber adsorption towers, a vacuum pump, a condenser and a liquid storage pot, wherein an activated carbon fiber adsorption column as well as an upper fixing rack and a lower fixing rack which are used for fixing the activated carbon fiber adsorption column are arranged in each adsorption tower; the activated carbon fiber adsorption column is formed by a hollow insulating pipe which has an airtight bottom and an upper opened end and activated carbon fiber fabric which wraps the wall of the side surface of the hollow insulating pipe; air through holes are formed in the wall of the side surface of the hollow insulating pipe; the wall of the side surface of the hollow insulating pipe is completely wrapped by the activated carbon fiber fabric; two ends of the activated carbon fiber adsorption column are connected with an electrode in which a current can be conducted. According to the device, organic molecules adsorbed by a plurality of activated carbon fiber adsorption towers are recycled in a desorption condensation manner through the combination of electric-heating and vacuum technologies. According to the process of the device, the continuous adsorption-desorption recycling of the organic waste gas can be realized, so that the recycling rate of the organic waste gas is high and the activated carbon fiber can be completely regenerated.

Description

(1) Technical field [0001] The invention relates to the technical field of air pollution control, in particular to an adsorption and desorption process of an activated carbon fiber adsorption tower and its application in the adsorption-desorption recovery of industrial organic waste gas (VOCS). (2) Background technology [0002] Activated carbon fiber has the characteristics of high specific surface area and large pore volume. Compared with activated carbon and zeolite, it has obvious advantages in adsorption capacity, so it is the preferred adsorbent in the adsorption-desorption recovery process of organic waste gas. However, more than 90% of the adsorption pores of activated carbon fibers are in the range of micropores (≤2nm), and it is difficult for the adsorbed organic molecules to desorb on the surface of activated carbon fibers, which affects the regeneration and life of activated carbon fibers, and also leads to its adsorption-desorption recovery. The organic waste ga...

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Problems solved by technology

[0007] Aiming at the shortcomings of large water vapor consumption, long desorption time and easy secondary pollution in the regeneration process of the existing organic waste gas activated carbon fiber adsorbent, the present invention proposes a fast, complete and environmentally friendly activated carbon fiber regeneration process. The scheme uses electric heating and vacuum technology to quickly desorb the organic molecules in the pores of the activated carbon fiber and condense them into liquid, while effectively maintaining the high adsorption capacity of the activated carbon fiber.

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