Device of increasing adsorption bed thermal-circular gas desorption regeneration efficiency and method thereof

Abstract

The invention relates to a device of increasing thermal-circular gas desorption efficiency and a method thereof. In the method, a by-pass system is added at each of the front and the back of an activated charcoal bed. On the basis of thermal-circular gas desorption, compressive condensation and a membrane separation system are employed for increasing desorption efficiency. During adsorption, a valve of the by-pass is closed so that the by-pass system is out of work; during desorption, an inlet-outlet valve of to-be-processed gas on the activated charcoal bed is closed and the valve of the by-pass is opened and then thermal gas desorption is carried out through circular heating by a circulating fan and a gas flow heater. When the gas is heated to a preset temperature, the valve and a pressure-reducing valve are opened, so that a part of the gas passes through an air compressor and then is condensed in a condenser to recycle organic solvents being high in purity, wherein the gas being not recycled is completely separated through the membrane separation system. High concentration gas is subjected to compressive condensation recycling before flowing-back to the air compressor through the valve, while clean gas is heated in the gas flow heater through the pressure-reducing valve and the valve and then is desorbed. The device is used of purification of polluted gas and recycling of organic solvents, is greatly increased in desorption efficiency and is increased in recycling purity and recycling efficiency of the organic solvents.

Description

technical field [0001] The invention relates to the technical fields of chemical industry and environmental protection, in particular to a device and a method for improving the desorption regeneration efficiency of hot gas circulation in an adsorption bed. Background technique [0002] In the fields of chemical industry and environmental protection, activated carbon adsorption beds are widely used in exhaust gas purification and recovery processes. Activated carbon adsorption recovery, on the one hand, helps to reduce production costs and generate economic benefits, on the other hand, it can reduce environmental pollution, and is an important link in the clean production of enterprises. The commonly used activated carbon adsorption recovery uses steam desorption, which has the defects of secondary water pollution and high overall energy consumption, and has the problem of low desorption efficiency for organic substances with higher boiling points. The boiling point range of...

AI Technical Summary

Problems solved by technology

but if figure 1 The traditional hot gas cycle desorption process shown requires a lot of energy for heating and condensing the gas, which cannot be applied on a large scale

figure 2 The split-flow condensing system shown better solves the problem of capacity matching between heating and condensation, and greatly reduces the demand for equipment and energy consumption compared with the first method, but the condensation temperature in the split-flow process determines the recovery of each cycle. The amount of adsorbed substances, for some adsorbed substances with low boiling point, often requires a very low condensation temperature, which puts forward high requirements for refrigeration equipment, otherwise it will affect the desorption efficiency due to the high concentration of reflux gas, and increase the regeneration of the system time

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