Industrial organic waste gas treatment and cleaning process

Abstract

The invention discloses an industrial organic waste gas treatment and cleaning process. The process includes adsorption, desorption and steam desorption treatment. The desorption steam flow as a heating medium forms a condensate through a jacket or coil of an evaporator; the condensate is mixed with supplemented industrial soft water and further cooled through a cooler one and a cooler two; and the mixture is discharged into an oil-water separator. Gaseous organic compounds and non-condensable gas merge into the industrial organic waste gas for treatment; liquid organic matters close to the equilibrium solubility and water are subjected to standing and stratification; an upper organic phase layer is recovered as a mixed organic solvent; a lower layer of steam condensate water as the circulating water is pressurized by a cold water pump and sent into the evaporator for evaporation; the generated circulating steam is sent to a steam drum for buffer, and then is subjected to temperature and pressure adjustment by a steam superheater, so that the circulating steam can substitute industrial steam in the desorption process of activated carbon. The invention realizes cycle utilization of desorption steam condensate, has no waste water discharge, at the same time improves the utilization rate of heat energy, and meets the requirements of energy saving, emission reduction and clean production.

Description

technical field [0001] The invention relates to an activated carbon vapor desorption cleaning process for industrial organic waste gas treatment, and belongs to the technical field of environmental protection and air pollution control. Background technique [0002] Most of the volatile organic pollutants (Volatile Organic Compounds, VOCs) are toxic, harmful, and have certain carcinogenicity; participate in photochemical reactions, form photochemical smog, or produce secondary organic aerosols, causing large areas of urban air "smog"; Partially depletes the ozone layer. Industries involving VOCs emissions, including petrochemicals, fine chemicals, spraying, packaging and printing, pharmaceutical and pesticide manufacturing, semiconductor and electronic product manufacturing, wood-based panels and wooden furniture manufacturing, leather, enameled wire, shoemaking, coatings, inks, adhesives Mixture production, metal casting, etc., there are many industries, and the VOCs produc...

AI Technical Summary

Problems solved by technology

Activated carbon water vapor desorption process, due to the advantages of simple process, wide application range, safe operation, and low equipment investment by 1 / 2~1 / 3, has the earliest industrial application time and mature process equipment, but it has low heat energy utilization rate and waste water discharge. Secondary pollution, etc.

[0005] Aiming at the activated carbon steam desorption process, Sun Zongchang et al. (Chinese patent ZL 200910065213.1) invented a method for recovering ethyl acetate in the steam desorption condensed wastewater through the aeration tower, but the load of the adsorption tower and the energy consumption of heating air were increased, and the desorption was limited. With the impact of ethyl acetate hydrolysis and solubility balance, it is still necessary to discharge waste water containing organic matter; Cai Zhihuang (Chinese patent ZL 200610037129.5) invented a method of using the waste heat of desorbed water vapor to heat waste water to recover solvent through partition heat exchange, but most of the steam The latent heat is not used, and the load of the adsorption tower is increased and the wastewater containing organic matter still needs to be discharged

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