Method for multistage adsorption and recovery of organic gases through active carbon fiber

Abstract

The invention provides a method for multistage adsorption and recovery of organic gases through active carbon fiber. All adsorbers can operate the organic gases in a series-parallel manner through series tubes arranged between every adjacent adsorbers to realize multistage adsorption of the organic gases, the highest adsorption grade can reach (N-1) grade (N is the quantity of the adsorbers contained in a system), and the opening or closure of the series tubes can be controlled to switch the adsorption grade between 1 and (N-1). After the adsorbers are saturated, saturated steam is used to desorb the adsorbers, desorbed steam is processed through a condenser and an oil-water separator, and an organic solvent is recovered. The desorbed adsorbers are dried and regenerated by air or an inert gas, then enter an adsorption process, and respectively work according to the above flow in a circulating manner, and the last stage adsorption in the adsorption process is desorption of the regenerated adsorbers. Compared with present multistage adsorption technologies, the method has the advantages of agile operation, low running cost, small device investment, high adsorption grade and obvious investment saving.

Description

technical field [0001] The invention relates to a method for realizing multi-stage adsorption and recovery of organic gas by using activated carbon fibers, especially for the adsorption, purification and recovery of organic matter in high-concentration and large-volume organic waste gas. Background technique [0002] The treatment methods of organic waste gas at home and abroad are roughly divided into two types, one is the recovery method and the other is the destruction method. For organic waste gas with low concentration, complex composition and low recovery value, the destruction method is generally used to convert the organic pollutants into non-toxic and harmless substances through thermal destruction, catalytic oxidation, biological decomposition, etc., so that the waste gas can meet the standard However, for organic waste gas with high concentration, single composition and high recovery value, the organic matter in it is generally recycled by the recovery method. The...

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Problems solved by technology

If the thickness of the single-stage activated carbon fiber adsorption layer is excessively increased, although the adsorption efficiency can be improved, the adsorption time can be prolonged, and the possibility of penetration can be reduced, but because physical adsorption is an exothermic reaction, a large amount of heat will be generated during the adsorption process, and the adsorption of too thick The layer will cause heat storage and combustion, which will bring unsafe hidden dangers. At the same time, too thick activated carbon fibers will also increase the wind resistance and increase the pressure difference, which is not conducive to the continuous operation of the adsorption and desorption process.

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