Active carbon fiber organic gas recovery method and system using nitrogen as desorption medium

Abstract

The invention relates to a method for recovering active carbon fibre organic waste gas by taking nitrogen as desorption medium, belonging to the field of environmental protection. The method for recovering active carbon fibre organic waste gas by taking nitrogen as desorption medium takes the active carbon fibre as a fixed bed adsorber of the adsorbent, adopts thermal nitrogen desorption and can recover and reuse the organic waste gas and nitrogen at the same time. The method of the invention adopts the thermal nitrogen adsorption, generates no secondary contaminant, realizes that the exhaustreaches the standard of the environmental protection, leads the adsorption layer to keep dry at the same time, improves the utilization ratio of the active carbon fibre and prolongs the service life of the active carbon fibre. As vapour is not used for desorption, the equipment has no corrosion problem, thus greatly reducing the manufacture cost of the equipment. The method of the invention has extremely good recovery effects on solvent with large water solubility and easy hydrolysis performance and organic waste gas with high boiling point, has low water content in the recovered products, high quality of the solvent and reduces the running cost.

Description

Technical field [0001] The invention relates to the field of environmental protection. It recovers high-boiling gaseous compounds, such as liquid compounds in normal state, from gaseous mixtures, and particularly relates to organic-containing waste gas generated in the production process of printing, light industry, coating, chemical, electronics and other industries A method of recovering a variety of organic waste gas and recycling them. Background technique [0002] Activated carbon fiber (ACF), also known as fibrous activated carbon, is a highly efficient active adsorption material and environmentally friendly engineering material with better performance than activated carbon. More than 50% of its carbon atoms are located on the inner and outer surfaces, forming a unique adsorption structure, which is called a surface solid. It is made of fibrous precursors, carbonized and activated by a certain procedure. The more developed specific surface area and narrower pore size dist...

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Problems solved by technology

[0004] (1) Secondary discharge sewage is produced, especially when recovering organic matter with high solubility, it is difficult to treat sewage, and the operation cost of using a rectification tower is high

[0005] (2) During desorption, a large amount of water vapor condenses in the activated carbon fiber adsorption layer. Although the dry wind blows, the water content of the activated carbon fiber is still high, which affects its adsorption performance and reduces the utilization rate.

[0006] When the organic waste gas contains substances such as easily hydrolyzed substances or halogenated hydrocarbons, the equipment is easily corroded under the action of high-temperature water vapor, and there are many impurities in the recycled products

[0007] (3) When the working conditions are poor, impurities such as dust entrained in the airflow will accumulate in the activated carbon fibers, and the activated carbon fibers will lose their activity under the effects of salting out and filling.

[0008] (4) For some occasions containing high boiling point substances, since the water vapor cannot be effectively desorbed, the adsorption rate of the above-mentioned process and device will drop a lot after a period of operation, and cannot operate normally

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