Organic waste gas treatment system and solvent recovery technology

Abstract

The invention relates to the technical field of organic waste gas treatment, and discloses an organic waste gas treatment system. The organic waste gas treatment system comprises a pretreatment system, a tail gas adsorption system, a nitrogen desorption system and a solvent refining system, wherein the pretreatment system comprises a surface air cooler (2) and a filter (3) which are sequentially communicated; the tail gas adsorption system comprises an activated carbon particle adsorber (4); the nitrogen desorption system comprises a heat exchanger (5), a heater (6), a desorption fan (7), a nitrogen buffer tank (8), a condenser (9), a gas-liquid separator (10) and a solvent buffer tank (11); and the solvent refining system comprises a mixed solvent pump (12), a high gravity rectification device (13), a molecular sieve dehydration tank (14) and a refined solvent storage tank (15) which are sequentially communicated. The invention also discloses an organic waste gas treatment and solventrecovery technology. The water content of an organic solvent obtained after using heated nitrogen as a desorbing agent, high-boiling point organic waste gas can be recovered, and nitrogen can be directly recycled to reduce the energy consumption.

Description

technical field [0001] The invention relates to the technical field of organic waste gas treatment, in particular to an organic waste gas treatment system and a solvent recovery process. Background technique [0002] At present, domestic mainstream treatment technologies for volatile organic waste gas mainly include condensation method, adsorption method, absorption method and combustion method, etc. Condensation method is usually used for solvents that can be recovered by condensation at room temperature; It is used to recover solvents with higher added value; while the combustion method cannot recover solvents. Therefore, in order to better recover the solvent while treating the medium / low concentration organic waste gas, the adsorption method is generally used to treat the organic waste gas. [0003] The traditional adsorption method is adsorption + steam desorption + rectification separation + solvent recovery method. This method is suitable for the treatment of organi...

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Problems solved by technology

[0004] Aiming at the disadvantages of relatively high energy consumption, low solvent recovery rate and unsatisfactory organic waste gas treatment effect in the prior art, the present invention provides an organic waste gas treatment system and a solvent recovery process

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