Method and device for recovering volatile organic compound through adsorption-electric heat desorption

Abstract

The invention relates to a method and a device for recovering volatile organic compound through adsorption-electric heat desorption. The method comprises the following steps of: (1) inputting waste gas containing VOCS (Volatile Organic Chemicals) from the upper part of a shell of an adsorption-electric heat desorption device, wherein the waste gas absorbed and purified by a hollow cylinder containing VOCS is discharged from the lower part of the shell; (2) inputting inert gas into the VOCS-absorbed hollow cylinder, electrifying and heating to warm the hollow cylinder, continuously introducing inert gas which penetrates outward from a hollow passage in the hollow cylinder through the cylinder wall, desorbing the VOCS absorbed on the cylinder wall to obtain the VOCS-containing inert airflow; and (3) condensing the VOCS-containing inert airflow so that the inert airflow is liquefied and flows to a VOCS tank, and the inert gas is discharged from the upper part of the shell of the adsorption-electric heat desorption device for cycle use. The invention has the advantages that the method and device has the characteristics of high efficiency, energy saving, short operation period and capability of recycling the inert gas.

Description

technical field [0001] The invention relates to the technical field of treating volatile organic compounds in industrial waste gas, in particular to an adsorption-electrothermal desorption recovery method for volatile organic compounds and a device thereof. Background technique [0002] Organic waste gas generally refers to harmful air pollutants or volatile organic compounds (HAPs / VOCs), that is, organic compounds with a saturated vapor pressure greater than 70.91Pa or a boiling point less than 260°C at room temperature. The composition of volatile organic pollutants is complex, including aromatic hydrocarbons, esters, ketones, ethers, halogenated hydrocarbons, aliphatic hydrocarbons, chlorinated hydrocarbons, oxygen-containing hydrocarbons, sulfur hydrocarbons, and polycyclic aromatic hydrocarbons with low boiling points. Mainly from industrial production processes, such as petrochemical, pharmaceutical, pesticide, printing, artificial leather, shoemaking, paint and coatin...

AI Technical Summary

Problems solved by technology

Most volatile organic compounds (VOCs) are flammable and explosive, and their accumulation also poses unsafe hazards to production enterprises, seriously threatening human beings and restricting the sustainable development of the national economy.

[0003] Activated carbon fiber (ACF s ) adsorption-water vapor desorption treatment to recover organic compounds in waste gas is the most widely used method in industry at home and abroad, but the water vapor regeneration method has great limitations: first, when water vapor is regenerated, organic gases and Saturated water vapor mixes to form a condensed mixture, such as benzene and water layers, alcohol and water are mixed together, and a tower group is required to separate the resulting organic mixture; second, some organic gases are not suitable for steam regeneration, such as halogen (Chlorine, bromine, fluorine) alkanes or similar, decomposed by water vapor during the regeneration process, the formed halogen acid (such as hydrochloric acid) corrodes the equipment; third, the desorption time of water vapor is long and energy consumption is high; fourth, water Regarding steam sources and prices, the traditional concept believes that water vapor is the most convenient energy. However, in today's energy conservation, emission reduction, and environmental protection, the ratio of water vapor to electric energy and the source are facing difficulties, which brings steam prices that are unacceptable for industrial production.

Images