A kind of vocs exhaust gas recovery treatment equipment and its treatment process

Abstract

The invention discloses a VOCs waste gas recovery and treatment device and its treatment process, which can filter and dedust the VOCs waste gas through pre-treatment, increase the retention time and disorder of the VOCs waste gas in the condensation tank to improve the condensation efficiency, and pass three-stage condensation The various components present in the exhaust gas can be condensed and liquefied in a unique way to improve the recovery rate of VOCs. The key points of the technical solution are: the VOCs waste gas recovery and treatment equipment includes a pre-treatment device, a condensation tank group, a refrigerant liquid supply device and a recovery device, the pre-treatment device includes a filter mechanism and a dust removal mechanism; the condensation tank group includes three condensation tanks connected in sequence, At least one of the inner chambers of the condensing tank is provided with a central condensing pipe and a spiral guide plate; the cooling liquid supply device includes a chiller and a liquid nitrogen tank; the recovery device includes a liquid flow channel and a liquid storage tank, and the bottom of the liquid flow channel is inclined. The VOCs waste gas recovery and treatment process includes preparation, pretreatment, condensation, exhaust and recovery processes.

Description

technical field [0001] The invention relates to the field of condensation recovery devices, in particular to VOCs waste gas recovery and treatment equipment and a treatment process thereof. Background technique [0002] VOCs are a kind of volatile organic compounds, which are important precursors of urban haze and photochemical smog. They mainly come from coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and other industries. VOCs exist in large quantities in industrial waste gas. VOCs have an unpleasant special smell, and are toxic, irritating, teratogenic and carcinogenic, especially benzene, toluene and formaldehyde will cause great harm to human health. [0003] With my country's increasing emphasis on the environment and the promotion of green production and green chemical policies, various industries have begun to devote themselves to more effective VOCs recovery and treatment solutions. At present, the commonly used rec...

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Problems solved by technology

[0004] 1. The residence time of VOCs exhaust gas passing through the traditional condenser is short, that is, the contact time between the gas and the condenser tube is short, and the gas passes through the condenser smoothly, making it difficult for VOCs to fully contact with the condenser tube, resulting in the inability of VOCs to be completely condensed Liquefaction, lower recovery rate of VOCs

[0005] 2. Since the VOCs exhaust gas may contain various types of organic substances such as benzene, ketones, lipids, ethers, etc., and the condensation temperatures required for various types of organic substances are different, resulting in only part of the VOCs exhaust gas passing through the condenser. Components are liquefied, other components are still discharged with the exhaust gas

[0006] 3. In addition to the gas components, the industrial waste gas is also mixed with some large solid particles and dust with small particle sizes. The large solid particles will cause damage to the inside of the condensing tube and the condenser, and the particles are easily deposited on the inner wall of the condensing tube and the condenser. The performance of the condenser, and the exhaust gas containing dust discharged into the air will also pollute the environment

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