Patent ID: 6223558
Filing Date: 2001-05-01
Classification: B01D,F23J,Y02E

Abstract:
A method of refrigeration purification and power generation of industrial waste gas wherein a front part is comprised of double stages or above multi-stage refrigeration cycle of the pure-phase changeable non-heating refrigeration technique, high efficiency deep cool quantity being prepared by the method of the pure-phase changeable non-heating refrigeration, characterizing in that, hot waste gas introduced into a rear part is progressively cooled by stages with the use of the deep cool quantity, with the use of the feature that the liquefying boiling temperatures of the toxic and harmful constituents in the waste gas are all higher than the boiling temperature of the clean oxygen and nitrogen, the waste gas is firstly liquefied by stages in its corresponding boiling temperature region in the respectively refrigerating stairs to completely separate with the clean gas and then respectively be collected as raw material; At the same time, with the use of the last stage phase change in the method of the last stage of the pure-phase changeable non-heating refrigeration technique to cool a refrigeration medium in the refrigeration cycle, the refrigeration medium, on one hand, releases sensible cool and latent cool to final liquefy the clean gaseous constituents in the industrial waste gas and, on the other side, absorbs heat thereon and is evaporated into high-temperature saturated steam to drive expansion turbine for power generation, and then the refrigeration medium of the last stage is cooled down and depressurized after turbining and enters into condensing space at the end of last stage refrigeration cycle to be reliquefied; At the same time, with the use of the fully liquefied clean gas in the industrial waste gas as medium, it absorbs heat from hot waste gas continuously entering into high temperature stage and evaporates into high-pressure steam to drive expansion turbine for electric power generation, the high-pressure clean gas are depressurized, cooled down and discharged freely after passing the expansion turbine; At the same time, the initial cooled industrial waste gas flow after rapid heat exchanged with deep refrigerating clean gas is being mechanically compressed to increase its density and temperature for providing heat in rapid evaporation of the refrigeration medium of the last stage into high-temperature saturated steam; At the same time, with the use of the pressure difference between a negative pressure generated in rapid cooling of hot industrial waste gas flow after being introduced into rear part and the normal pressure of the hot industrial waste gas flow before being introduced into rear part, and with the use of a work energy formed between the pressure difference and hot industrial waste gas flow, a mechanical motion is generated via wind turbine for the kinetic energy complement in the process of mechanical compression of the initial cooled industrial waste gas flow.