A device and method for concentration, recovery and treatment of organic waste gas

Abstract

The invention relates to a treatment device and method for concentrating and recovering organic waste gas. The method comprises the steps of (1) feeding the organic waste gas into a membrane assembly through a dust remover; (2) keeping the membrane assembly in vacuum and separating out nitrogen, oxygen and water vapor to obtain the concentrated organic waste gas; (3) pre-cooling the concentrated organic waste gas through an exhaust gas heat exchanger, and feeding the concentrated organic waste gas into a cryogenic catcher; and (4) condensing organic matter steam in the cryogenic catcher, reusing condensate to a production system, carrying out heat exchange and online analysis on non-condensable gas through the exhaust gas heat exchanger, evacuating if the exhaust gas is qualified, and if the exhaust gas is not qualified, returning the exhaust gas to an inlet of the membrane assembly in cycle for secondary treatment until the exhaust gas is qualified. The invention provides a treatment method for the organic waste gas, which is safe in operation and free of new pollution, the application range of the organic matter content is wide, and the organic matters in the waste gas can be recycled.

Description

Technical field [0001] The invention relates to an organic waste gas treatment method, in particular to an organic waste gas concentration recovery treatment device and method that uses molecular sieve membrane technology to concentrate organic steam and condense and recover the treatment. Background technique [0002] In recent years, the degree of air pollution in my country has become increasingly severe, especially in the northern region where there have been many continuous smog and haze weather, which has aroused the general attention and attention of the government, academia and the public, and the treatment of exhaust gas has become an urgent task. Organic waste gas, especially waste gas from petrochemical, fine chemical, printing and dyeing, screen printing, spraying, printing and other industries that use a large amount of organic solvents, play a major role in causing air pollution. At present, the treatment of organic waste gas mainly includes adsorption method, regen...

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Problems solved by technology

This method has a simple structure and is suitable for a wide range of organic component concentrations, but the adsorption capacity of the adsorbent will decay with the prolongation of use time, and the decay rate is related to the component composition and desorption frequency. Can not run stably for a long time

In addition, steam desorption is used to convert waste gas into waste water, causing new pollution sources

[0004] The regenerator combustion method uses natural gas to generate a flame and provide a heat source, and converts the organic components introduced into the regenerator waste gas into harmless carbon dioxide and water in the form of combustion. This method treats the organic components thoroughly and basically does not produce new pollution. However, it consumes a large amount of natural gas, and at the same time, because the organic components in the exhaust gas need to be combusted with air, if it reaches the explosion limit of organic matter, it will easily cause a safety accident

[0005] The plasma method uses electrode discharge to generate plasma, and the waste gas passes through the plasma, and the organic components are decomposed into low-toxic or harmless substances such as carbon dioxide and water under the action of the plasma. When the concentration of organic waste gas is too high, the plasma electrode will be covered by carbon deposits, greatly reducing efficiency

[0006] The above methods have more or less insurmountable shortcomings. In addition, both the combustion in the regenerator and the plasma method destroy the structure of the organic components, and the organic components in the waste gas cannot be recycled. The adsorption method forms an aqueous solution of organic matter, and the organic composition There is no chemical change, but the concentration of organic matter in the aqueous solution is low, so it is difficult to recycle

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