Organic waste gas treatment method

Abstract

The invention relates to a method for treating organic waste gas, comprising the following steps: (A1) adjusting the intake air volume, the organic waste gas to be treated enters the adsorption treatment channel and is adsorbed by the adsorption unit and then discharged up to the standard, the maximum value of the intake air volume Q max =m·k 1 k 2 / (C t); (A2) The adsorption unit is switched to the desorption state, and the steam enters the desorption treatment channel; (A3) The desorption unit is switched to the residual desorption gas circulation state, the circulation fan is started, and the residual desorption The attached gas is cooled and the gas-liquid is separated, and the separated gas returns to the desorption unit and then circulates in the circulation treatment channel, and the separated liquid enters the stratified tank; (A4) the desorption unit is switched to the purge state, and the purge gas Enter the desorption unit through the purge gas inlet valve to be purged and then discharged; (A5) The desorption unit is switched to the adsorption state. The invention has the advantages of safety and reliability, the combination of residual desorption gas circulation and purging, and the discharge of tail gas up to the standard throughout the whole process.

Description

technical field [0001] The invention relates to the field of waste gas treatment and recovery, in particular to a treatment method for organic waste gas that uses a combination of residual desorption gas circulation and purge gas purging to cool and adsorb after steam desorption. Background technique [0002] The method of temperature swing adsorption and desorption regeneration after adsorption has been used to treat organic waste gas for many years, especially suitable for industrial exhaust gas with large air volume and low concentration. Desorption regeneration includes steam desorption, hot nitrogen desorption and vacuum desorption, among which steam desorption is widely used because of its good desorption effect, low energy consumption and convenient public works. However, the temperature swing adsorption steam desorption has the following defects in the application process: [0003] 1. Use low-pressure saturated steam for desorption, and the desorption efficiency is ...

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Problems solved by technology

[0003] 1. Use low-pressure saturated steam for desorption, and the desorption efficiency is 98% after desorption for 30 minutes. The residual organic matter is purged and discharged, resulting in the initial discharge gas not meeting the standard; if the desorption time continues to increase, the desorption effect will not increase. Obviously, if the desorption efficiency is 99% after 60 minutes of desorption, at the same time, the increase of desorption time will lead to the inability to switch the adsorption tank, and the prolongation of the adsorption time will lead to the emission of purified tail gas in the later stage of adsorption not up to the standard;

[0004] 2. When the desorption is completed, the adsorber is filled with a large amount of steam, and the residual steam is blown out during the purging process, resulting in a large amount of liquid and white smoke in the exhaust pipe and chimney, which not only affects the service life of the chimney, but also affects the environmental quality;

[0005] 3. The best adsorption temperature of the adsorption material is 20-40°C, high temperature is not conducive to the adsorption of organic matter, and when the desorption is completed, the temperature of the adsorber is about 100°C, and the organic matter cannot be adsorbed by the adsorbent

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