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Adsorption-desorption exhaust gas treatment
Hits: 3162 times Added: 2017-6-12 [ Print ] [ Return ] [ Favorite ]

Overview: Adsorption-desorption technology is to use a porous solid adsorbent to adsorb one or several components in a mixture on the surface, and then decompose and adsorb the adsorption group with a suitable solvent, heating or blowing to achieve separation, The purpose of collection and recycling. Molecules in the gas can be adsorbed on the surface of the adsorbent phase because of the van der Waals force and chemical bonding force of the gas molecule and the adsorbed surface molecule, the former being physical adsorption and the latter being chemical adsorption. Desorption technology includes temperature desorption, decompression desorption, flush desorption, displacement desorption, and magnetization desorption. Among them, water vapor high temperature displacement desorption is more commonly used. For VOCs waste gas, if the composition of the pollutant is single or the adsorption is selective, consider the simple treatment after adsorption-desorption for reuse; if the composition of the gas pollutant is complex and the concentration is low, the concentration adsorption-desorption can be used, or Other technologies (RTO, RCO, etc.) assist governance, and ultimately achieve the purpose of resource and harmlessness.



1. Adsorption-desorption technology is to use a porous solid adsorbent to adsorb one or several components in the mixture on the surface, and then decompose the adsorption group with a suitable solvent, heating or blowing to achieve separation, The purpose of collection and recycling. Molecules in the gas can be adsorbed on the surface of the adsorbent phase because of the van der Waals force and chemical bonding force of the gas molecule and the adsorbed surface molecule, the former being physical adsorption and the latter being chemical adsorption. Desorption technology includes temperature desorption, decompression desorption, flush desorption, displacement desorption, and magnetization desorption. Among them, water vapor high temperature displacement desorption is more commonly used. For VOCs waste gas, if the composition of the pollutant is single or the adsorption is selective, consider the simple treatment after adsorption-desorption for reuse; if the composition of the gas pollutant is complex and the concentration is low, the concentration adsorption-desorption can be used, or Other technologies (RTO, RCO, etc.) assist governance, and ultimately achieve the purpose of resource and harmlessness.

2. The zeolite runner technology combines the three operation units of adsorption, desorption, and concentration and incineration. It is a relatively complete technology and device for treating VOCs. The principle is that the VOCs are periodically adsorbed and regenerated on the zeolite by the rotation of the runner. After the adsorption, the exhaust gas meets the standard discharge, and the concentrated exhaust gas is incinerated or refrigerated for recycling.

Adsorption and desorption technology

1. The use of activated carbon as an adsorbent has the advantages of high adsorption capacity. After two-stage condensation, the VOCs recovery rate is more than 80%, which realizes resource utilization;
2, compact device combination, high degree of automation, easy to operate;
3. Adopting water vapor desorption at about 100-150 ℃, the degree of damage to the activated carbon is small, and the deactivated activated carbon can be reused immediately after drying.

Zeolite runner technology

1. Suitable for large air volume and low concentration VOCs exhaust gas treatment;
2. The adsorbent is a hydrophobic zeolite, which can effectively deal with high-temperature volatile organic gases;
3. The construction cost and operation and maintenance costs are relatively high, which is not suitable for directly processing high boiling point VOCs.