Method and device for treating volatile organic chemicals (VOCs) gas of medium or low concentration

Abstract

The invention relates to a method and a device for treating volatile organic chemicals (VOCs) gas of medium or low concentration. The method comprises the steps of filtering the VOCs gas of medium orlow concentration for removing particulate matters, then decomposing and oxidizing the VOCs gas by means of UVC photolysis, UVC photoexcited oxidation, ozone oxidation and TiO2 photocatalytic oxidation as well as molecular sieve adsorption and desorption so as to enable the VOCs gas to be converted into CO2 and water, filtering the obtained gas by using an ozone filtering device, and discharging the gas when the gas is proved to be qualified by means of detection. After the method and the device are adopted, on-line VOCs adsorption and desorption can be realized by means of a synergistic effect of a molecular sieve module and UVC light irradiation; in a treatment process, chemical additives and precious metal catalysts are not needed to be used, so that secondary pollutants are not produced, the efficiency is greatly increased, and a good treatment efficiency is further realized. After being treated, most of the VOCs gas is decomposed and oxidized, and extra energy consumption is not caused; furthermore, the operation and maintenance costs of the device are reduced.

Description

technical field [0001] The invention belongs to the field of organic waste gas treatment, and in particular relates to a treatment method and device for medium and low concentration VOCs gas. Background technique [0002] VOCs refer to various volatile organic compounds with a boiling point of 50°C to 260°C at room temperature. There can be millions of VOCs in a broad sense, and they are one of the main pollutants in the atmosphere. According to its chemical structure, it can be divided into the following categories: hydrocarbons (alkanes, olefins and aromatics), esters, aldehydes, ketones, alcohols, phenols, amines, nitriles (cyanides), and organic halogens Derivatives etc. [0003] Most volatile organic compounds are toxic and have the characteristics of wide pollution, toxicity, odor, large emission and low concentration. Their good treatment is a difficult problem in the environmental protection industry. Due to the different molecular structures of various VOCs, diffe...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a treatment method and device for medium and low concentration VOCs gas, which overcomes the problems of unsatisfactory treatment effect and high cost of medium and low concentration VOCs gas in the prior art. The present invention can make adsorption and desorption real-time On-line, no chemical additives and precious metal catalysts are required during the treatment process, no secondary pollutants are produced, the treatment effect on medium and low concentration VOCs gases is over 90%, no additional energy consumption is required, and operation and maintenance costs are reduced

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