Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Reexamination Certificate
2000-04-26
2001-05-01
McDermott, Corrine (Department: 3744)
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
C062S434000
Reexamination Certificate
active
06223558
ABSTRACT:
INVENTION BACKGROUND
The present invention relates to the environmental protection and electric power industry, especially to the method and the apparatus of deep refrigeration purification of industrial waste gas, in particular the furnace flue gas, and electric power generation with utilizing heat energy work of the waste gas.
Waste gas discharged in modern industrial production seriously pollutes the atmosphere. Toxic and harmful gaseous constituents in the waste gas threaten human survival. Apparently, worldwide environmental protection is very important and the conventional technical solutions for solving the industrial waste gas pollution are only limited to the methods of smoke prevention, dust control and simple desulphurization or the like to abate pollution. Up to now, mostly all of the industrial furnace waste gas is discharged to the atmospheric space relying in the manner that the pollutants are directly discharged into atmospheric layer by adopting chimneys.
OBJECT OF THE INVENTION
The object of the invention is to provide a new method and the apparatus of refrigeration purification and power generation of industrial waste gas. It adopts pure-phase changeable non-heating refrigeration technique for obtaining high efficiency deep cool quantity, and makes use of deep cool quantity to liquefying toxic and harmful constituents in the waste gas firstly to separate clean gas from toxic and harmful constituents, to thoroughly purify the industrial waste gas, and makes use of the heat energy of the industrial waste gas to generate electric power.
BRIEF OF INVENTION
The technical solution according to the invention as follows:
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; 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.
A apparatus of refrigeration purification and power generation of industrial waste gas, wherein a front part of which 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 apparatus of the pure-phase changeable non-heating refrigeration; A rear part of which is comprised of a rear insulating pressure vessel, a medium pump, heat exchangers mounted in the rear insulating pressure vessel as same as those in the last stage refrigeration cycles of the front part, motor, a axial flow wind turbine, a centrifugal air compressor, dust and smoke collectors and liquid waste gas collectors, and expansion turbine groups and a electric power generator group; A isolation layer is provided in the mid of said rear insulating pressure vessel where the upper side of the isolator layer is a negative pressure cooling region and the lower side of the isolator layer is a pressurized cooling region; Said heat exchangers are respectively installed inside the negative pressure cooling region and the pressurized cooling region, the motor being transmission-linked to the centrifugal air compressor and the axial flow wind turbine via coupling shaft; Said axial flow wind turbine is installed in an inlet of the negative pressure-cooling region and a first dust and smoke collector is further mounted at the inlet, hot industrial waste gas being introduced into the rear part insulating pressure vessel to drive blades of the axial flow wind turbine for centrifugal separating the dust and smoke which is initially collected; Said centrifugal air compressor is installed on the isolation layer, namely, mounted on an inlet of the pressurized cooling region, a second dust and smoke collector being further mounted at the inlet, dust and smoke being centrifugal separated and collected again; Said liquid waste gas collectors are respectively provided in the interspace of the heat exchangers inside the negative pressure cooling region and the pressurized cooling region so that the condensed and liquefied toxic and harmful constituents are respectively collected as raw material where oxygen and nitrogen constituents in the waste gas are finally condensed as liquid and stored at the bottom of the pressurized cooling region of rear part insulating pressure vessel; Said medium pump is connected to an inlet pipe of the heat exchanger in the negative pressure-cooling region via a first insulating pressure pipe, an outlet pipe of the heat exchanger in the negative pressure-cooling region being connected to the first expansion turbine group via a second insulating pressure pipe, an inlet pipe of the heat exchanger in the pressurized cooling region being connected to medium pump in the front part last stage of refrigeration cycle via a medium delivery pipe, an outlet pipe of the heat exchanger in the pressurized cooling region being connected to the second expansion turbine group via an insulating return pipe; Said first and second expansion turbine groups are respectively linked to the electric power generator group via coupling shafts, another end of the first expansion turbine group being a clean gas outlet where an another end of the second expansion turbine group being connected to refrigerating space in the front part last stage of refrigeration cycle via a second insulating return pipe.
The present invention is that industrial waste gas is introduced into the said apparatus and progressively c
Drake Malik N.
Jenkens & Gilchrist P.C.
McDermott Corrine
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