Series targeted adsorption and parallel desorption organic waste gas treatment device

Abstract

The invention discloses a series targeted adsorption and parallel desorption organic waste gas treatment device. The device comprises a series adsorption system, a parallel desorption system and a catalytic combustion system. The series adsorption system comprises a waste gas inlet pipeline, an adsorption box body, an exhaust pipeline, a circulating pipeline and a main fan. The parallel desorptionsystem comprises a desorption fan, a second-stage heat exchanger, a desorption air inlet pipe, an automatic valve and a desorption exhaust pipe. The catalytic combustion system comprises a first-stage heat exchanger A, a first-stage heat exchanger B, a heater and a catalytic reactor. According to the invention, corresponding targeted adsorbents are selected according to molecular diameters and adsorption characteristics of different pollutants, a thin adsorption bed layer and a multi-stage parallel desorption mode are adopted, the desorption time is shortened, and the desorption peak concentration can be effectively controlled, so that the safety problem caused by desorption due to an overlong adsorption band is avoided, the heating frequency of the catalytic combustion system is reduceddue to the relative stability of the VOCs concentration during desorption, the agglomeration of a catalyst is avoided, the VOCs combustion reaction heat is fully utilized, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a serial targeted adsorption and parallel desorption organic waste gas treatment device. Background technique [0002] Most of the VOCs emitted by industrial enterprises have the characteristics of large air volume and multiple components. It is a common treatment process to adopt adsorption concentration, desorption and catalytic combustion. However, due to the relatively complex pollutant components and the existence of competitive adsorption, the conventional primary activated carbon adsorption and purification efficiency is not high; the desorption and cooling time of each carbon box is relatively long, in order to achieve continuous production, the general adsorption carbon box reaches adsorption saturation Desorption is carried out when the adsorption band is too long, which causes safety problems caused by the high peak concentration during desorpti...

AI Technical Summary

Problems solved by technology

However, due to the relatively complex pollutant components and the existence of competitive adsorption, the conventional primary activated carbon adsorption and purification efficiency is not high; the desorption and cooling time of each carbon box is relatively long, in order to achieve continuous production, the general adsorption carbon box reaches adsorption saturation The desorption is only carried out when the adsorption band is too long, which causes safety problems caused by an excessively high peak concentration during desorption. At the same time, the adsorption breakthrough point has been reached before the adsorption saturation, and the purification efficiency cannot be guaranteed.

[0003] According to relevant research, the ratio of the pore size of the adsorbent to the molecular diameter of the adsorbate is between 1.7 and 3.0, and the adsorbent can effectively adsorb pollutants. treatment, purification efficiency cannot be guaranteed

In order to improve the purification efficiency, there are also two-stage adsorption and three-stage adsorption on the market, or even more. The conventional N-stage adsorption requires a 2N-stage carbon box to achieve it. Not only does it occupy a large area, but the one-time investment cost is also too high. high

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