Organic waste gas adsorption-desorption recycling technology and device

Abstract

The invention relates to an organic waste gas adsorption-desorption recycling technology and device, and belongs to the field of organic waste gas treatment. The organic waste gas adsorption-desorption recycling technology is characterized in that nitrogen is used as a medium, an organic matter is recycled via vacuum circulating adsorption and compression condensing, then the exhaust of organic waste gas can reach standards, and the secondary pollution is avoided because of recycling of the organic matter; by adopting vacuum oxygen suction and circular heating and cooling adsorbers, the usage amount of nitrogen is greatly reduced, and a whole desorption cycle is shortened; by adopting compression condensing to recycle the organic matter, the condensing temperature is increased, the requirement on a condensing system is decreased, and the energy consumption in the running of the low-temperature condensing system is decreased. The organic waste gas adsorption-desorption recycling technology has the characteristics that the applicability is wide, the investment is saved, the energy consumption is low, the quality of a recycled product is good, and the secondary pollution is avoided; the investment running cost of an enterprise is greatly reduced, and the double earning of social benefits and economic benefits is realized.

Description

technical field [0001] The invention relates to the field of organic waste gas treatment, in particular to an organic waste gas adsorption-desorption recovery process and device. Background technique [0002] VOCs are a class of volatile organic compounds with a boiling point of 50°C to 260°C and a saturated vapor pressure of more than 133.33Pa at room temperature, which are very harmful to human health and the ecological environment. Effective recycling and treatment of this kind of organic waste gas can not only avoid environmental pollution, but also turn waste into treasure, reduce the investment cost of enterprises, and achieve a win-win situation of social and economic benefits. [0003] At present, among the methods of recovering organic solvents by adsorption-desorption, the most widely used method is still steam desorption, which desorbs organic waste gas with water vapor, and then turns the organic waste gas into liquid by cooling to realize the process of recyclin...

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Problems solved by technology

[0003] At present, among the methods of recovering organic solvents by adsorption-desorption, the most widely used method is still steam desorption, which desorbs organic waste gas with water vapor, and then turns the organic waste gas into liquid by cooling to realize the process of recycling. This method has the following problems: (1) During desorption, a large amount of water vapor condenses in the adsorption layer, which cannot be completely dried, which affects the adsorption performance and reduces the utilization rate; (2) When the organic waste gas contains easily hydrolyzed substances or halogens When substituting hydrocarbons and other substances, under the action of high-temperature water vapor, it will cause great corrosion to the equipment; (3) Due to the high water content of the mixed liquid, it is not easy to reuse, and it is impossible to directly recover alcohols, ketones, lipids, etc. Solvent recovery problems that are miscible and slightly soluble in water; (4) For some occasions containing high boiling point substances, the adsorption efficiency is affected because water vapor cannot be effectively resolved; high processing cost

[0005] Due to the small heat capacity of nitrogen, not only the heat exchange area required for gas heat exchange is relatively large, but more nitrogen is used to reach the desorption temperature of the adsorption bed; the condensation recovery of desorbed gas requires a lower condensation temperature, The requirements for equipment are also increased, and the low temperature loss is also large, which increases the investment and operation costs of enterprises.

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