Active carbon fiber device and method for adsorbing, recovering and treating organic waste gas

Abstract

The present invention features that the waste organic gas recovering and treating apparatus includes also one rectifying and recovering system, which comprises rectifying tower between the outlet of analyzed gas and the condensator and solvent accepting trough between the rectifying tower and the condensator and is for recovering the organic solvent; and may includes also one analyzed gas by-pass cooling system and one gas distributing baffle. The method of recovering and treating waste organic gas may be alternate single stage adsorption-analysis-cooling and dehumidifying in two or three serially connected adsorbors, and through connection and arrangement of pipeline and valves, uninterrupted recovering and treating of waste organic gas is realized.

Description

technical field [0001] The invention relates to a device and a method for recovering and treating organic pollutants in waste gas with activated carbon fibers. More specifically, it relates to a device and method for recovering and treating organic waste gas that uses activated carbon fibers to absorb volatile organic pollutants in waste gas, then desorbs them with high-temperature water vapor, and condenses them into liquid organic solvents with a cooler. Background technique [0002] Organic waste gas refers to the gas of organic solvents volatilized into the atmosphere in petrochemical, electronics, textile, and painting production, such as benzene, toluene, styrene, acetone, chlorinated alkanes, cycloalkanes, n-hexane, ether, etc. [0003] At present, the main method to deal with this kind of waste gas is adsorption. There are two kinds of adsorbents, granular activated carbon and activated carbon fiber. Compared with granular activated carbon, activated carbon fiber h...

AI Technical Summary

Problems solved by technology

Usually, in order to improve the recovery rate of organic solvents, it is necessary to lower the temperature of the condensate, but the condensed water does not need low temperature, but because the organic solvent and water vapor are all cooled at the same temperature, not only the energy consumption of the coolant is high, but also The recovery effect of organic solvent is not easy to guarantee

[0012] ② After desorption, the adsorption core begins to enter the adsorption state without sufficient cooling. Since the temperature inside the activated carbon fiber is very high in the initial stage of adsorption (close to the temperature of desorption steam), the adsorption rate is very low, and the organic pollutants in the exhaust gas high concentration

During this time period, the pollutant concentration in the gas discharged from the adsorber is high and the compliance rate is low

[0013] ③After the exhaust gas enters the adsorber, there is no diffusion facility, and part of the air flow is directly blown to the activated carbon fiber adsorption core near the air inlet, which makes the gas velocity on the local activated carbon fiber too high, resulting in a large amount of adsorption on most activated carbon fibers. When there is a surplus, certain parts have penetrated ahead of time, so the adsorption has to be stopped and desorption started, resulting in problems such as low adsorption rate, short adsorption cycle, high desorption frequency, and increased waste gas treatment cost.

Since the specific gravity of the desorbed organic vapor is relatively light, it is easy to accumulate in the upper part of the adsorber, and the organic vapor cannot be discharged naturally at the bottom of the discharge port, so more steam is needed to entrain it, which not only causes waste of steam but also cannot desorb it. The organic solvent gas is completely discharged, and is re-adsorbed on the activated carbon fiber in the next adsorption process, occupying the effective adsorption capacity.

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