CN102809262B - A kind of method and device utilizing IGCC gas turbine compressed air production oxygen - Google Patents
A kind of method and device utilizing IGCC gas turbine compressed air production oxygen Download PDFInfo
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- CN102809262B CN102809262B CN201210300001.9A CN201210300001A CN102809262B CN 102809262 B CN102809262 B CN 102809262B CN 201210300001 A CN201210300001 A CN 201210300001A CN 102809262 B CN102809262 B CN 102809262B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
- F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
- F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04109—Arrangements of compressors and /or their drivers
- F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
- F25J3/04127—Gas turbine as the prime mechanical driver
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04163—Hot end purification of the feed air
- F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
- F25J3/04181—Regenerating the adsorbents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
- F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
- F25J3/042—Division of the main heat exchange line in consecutive sections having different functions having an intermediate feed connection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
- F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04593—The air gas consuming unit is also fed by an air stream
- F25J3/04606—Partially integrated air feed compression, i.e. independent MAC for the air fractionation unit plus additional air feed from the air gas consuming unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
- F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
- F25J2205/70—Heating the adsorption vessel
Abstract
A kind of method and device utilizing IGCC gas turbine compressed air production oxygen, described device at least comprises an air separation unit be made up of rectifying column, it also comprises: have one can draw the compressed-air actuated gas turbine group compressor of one combustion gas, one can by described combustion gas compressed air with carry out heat exchange from air separation unit nitrogen at room out before heat exchanger; A leading portion heat exchanger channels entered for combustion gas compressed air is provided with in main heat exchanger in air separation unit, this leading portion heat exchanger channels is provided with the high-temperature turbine decompressor of a connection band generator on the top of main heat exchanger, combustion gas compressed air outlet on this high-temperature turbine decompressor is connected to the back segment heat exchanger channels in main heat exchanger again, described back segment heat exchanger channels outlet raw air compressor come air converge runner after or be directly communicated with and access in the medium pressure column of rectifying column; The present invention achieves the separation of oxygen, nitrogen in the double tower of rectifying column; Obtain liquid oxygen at lower pressure column, liquid oxygen is after at least one liquid oxygen pump compression, and in main heat exchanger, re-heat vaporizes normal temperature as high pressure oxygen product.
Description
Technical field
What the present invention relates to is a kind of heat energy and pressure energy of utilizing IGCC gas turbine compressed air, produces method and the device of high pressure oxygen, belong to cryogenic technique field for air separation unit.
Background technology
Integrated gasification combined cycle for power generation system, i.e. IGCC(Integrated Gasification Combined Cycle), it is advanced power systems Coal Gasification Technology and efficient combined cycle combined, environmentally friendly, non-pollutant discharge, has practical significance to environmental protection.
IGCC system mainly comprises air separation unit, gas turbine group, vapor wheel unit.Gas turbine unit comprises compressor, decompressor, generator and combustion chamber.Decompressor drives generator and compressor by mechanical connection, sees shown in accompanying drawing 1.
Gas turbine unit be compressor work produce compressed air, pressure 1.3MPa(absolute pressure), temperature 400 DEG C.Compressed air except small part be injected into the combustion chamber of gas turbine combustion-supporting except, major part by expenditure and pressure to 0.5MPa(absolute pressure), through purifying, lower the temperature after send into the raw air of air separation unit as oxygen.As shown in the figure.In the process, the heat energy that gas turbine compressed air is a large amount of is recycled water quench cooling and wastes; The pressure energy of 1.3MPa is throttled to 0.5MPa and is wasted too.Compressed air is 30% of air separation unit processing air capacity, and the molecular screener adsorbing system of air separation unit needs a large amount of heats to carry out regenerating molecular sieve simultaneously.If the heat energy that gas turbine compressed air can be utilized a large amount of and pressure energy, be conducive to the reduction of air separation unit oxygen energy consumption.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, and provide a kind of and the compressed-air actuated heat energy of gas turbine and pressure energy can be reclaimed, for air separation unit oxygen improves heat and cold, thus reduce the consumption of integrated gasification combined cycle for power generation system, realize heat recovery, so that cost-saving and power, the IGCC gas turbine compressed air that utilizes reducing air separation unit oxygen energy consumption produces method and the device of oxygen.
The object of the invention is to have come by following technical solution, a kind of device utilizing IGCC gas turbine compressed air to produce oxygen, which comprises at least one primarily of raw air compressor, cooling, purification unit, the air separation unit of the rectifying column formation of main heat exchanger and mesolow double tower and main condenser composition, it also comprises one can draw the compressed-air actuated gas turbine group compressor of one combustion gas, one can by described combustion gas compressed air with carry out heat exchange from air separation unit nitrogen at room out before heat exchanger; A leading portion heat exchanger channels entered for combustion gas compressed air is provided with in main heat exchanger in air separation unit, this leading portion heat exchanger channels is provided with the high-temperature turbine decompressor of a connection band generator on the top of main heat exchanger, combustion gas compressed air outlet on this high-temperature turbine decompressor is connected to the back segment heat exchanger channels in main heat exchanger again, described back segment heat exchanger channels outlet raw air compressor come air converge runner after or be directly communicated with and access in the medium pressure column of rectifying column.
Be provided with between described front heat exchanger and main heat exchanger a pair combustion gas compressed air carry out purifying with except anhydrating, the purification unit of carbon dioxide and hydrocarbon impurity.
At least divide after supercooling, purification unit after described raw air compressor and be connected to two road raw airs, first via raw air connects a High-Pressure Compressor through piping, connecting the supercharger of a cryogenic turboexpander with pipeline after the first cooler, supercharger outlet is connected to the second cooler, connects main heat exchanger afterwards by pipeline; Pick out a branch line at the middle part bifurcated of described main heat exchanger and connect cryogenic turboexpander, access in the medium pressure column of described rectifying column afterwards; And directly pick out a pipeline from bottom from main heat exchanger and access in the medium pressure column of described rectifying column directly or indirectly;
Second road raw air directly or indirectly accesses in the medium pressure column of described rectifying column after the second road raw air runner of described main heat exchanger.
Utilize IGCC gas turbine compressed air to produce a method for oxygen, the method is: the heat energy and the pressure energy that utilize IGCC gas turbine compressed air, and produce high pressure oxygen for air separation unit, it comprises following several step:
1) one compressed air is drawn from gas turbine group compressor, wherein at least partially by a front heat exchanger, carry out heat exchange with the dirty nitrogen of air separation unit normal temperature out, make dirty nitrogen temperature increase, compressed air is cooled to normal temperature, thus achieves the recovery of compressed air heat energy;
2) compressed air heat energy continues purifying after reclaiming, after purification unit except anhydrating, send into the main heat exchanger of empty point ice chest after carbon dioxide and hydrocarbon impurity;
3) after compressed air guides to main heat exchanger, extract out from the top of main heat exchanger, then the high-temperature turbine decompressor being sent to a band generator carries out expansion step-down and cooling, and high-temperature turbine decompressor drives electrical power generators by mechanical couplings, thus achieves the recovery of compressed air pressure energy;
4) compressed air after cooling continues to carry out heat exchange with adverse current body in main heat exchanger, thus cool further, the raw air come with air separation unit air compressor converges in the rectifying column medium pressure column that enters in ice chest, as a part of raw air of air separation unit.
5) rectifying column described in forms Double-Tower Structure by a medium pressure column and a lower pressure column by main condenser connection, pass through main condenser, medium pressure column provides lower pressure column bottom liquid to evaporate the heat producing upflowing vapor, and lower pressure column provides the condensation of medium pressure column top nitrogen to produce the cold of phegma, in double tower, achieve the separation of oxygen, nitrogen; Obtain liquid oxygen at lower pressure column, liquid oxygen is after at least one liquid oxygen pump compression, and in main heat exchanger, re-heat vaporizes normal temperature as high pressure oxygen product.
The present invention comes from described air separation unit air compressor as another part raw air of air separation unit, and the air compressor raw air of described air separation unit is divided into following two parts:
Part raw air is delivered to a High-Pressure Compressor and is compressed, and introduces afterwards after main heat exchanger exchanges with body heat of backflowing and cools, then use a high pressure throttling arrangement, send into the bottom of medium pressure column after throttling;
The raw air introducing main heat exchanger of remainder exchanges with fluid thermal of backflowing and is also cooled, and also sends into the bottom of medium pressure column afterwards, participates in the rectifying in medium pressure column.
The compressed air of gas turbine unit has a large amount of heat energy and pressure energy, IGCC air separation unit produces high pressure oxygen to be needed to consume a large amount of electric energy, the object of the present invention is to provide and a kind ofly can make full use of the heat energy of IGCC gas turbine compressed air and the apparatus and method of pressure energy, relative to prior art, it has less specific energy consumption and produces hyperbaric oxygen, and does not disturb other system of IGCC and affect; It has fully recycled a large amount of heat energy of the compressed air of IGCC system and pressure energy, thus reduces the cost that air separation unit produces high pressure oxygen, can obtain high pressure oxygen economically.
Accompanying drawing explanation
Fig. 1 is existing gas turbine group process principle figure.
Fig. 2 is technological process schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.Shown in Fig. 2, a kind of device utilizing IGCC gas turbine compressed air to produce oxygen of the present invention, which comprises at least one primarily of raw air compressor, cooling, purification unit, the air separation unit of the rectifying column formation of main heat exchanger and mesolow double tower and main condenser composition;
It also comprises: have one can draw the compressed-air actuated gas turbine group compressor of one combustion gas 31, can by described combustion gas compressed air with carry out heat exchange from air separation unit nitrogen at room out before heat exchanger 37; A leading portion heat exchanger channels entered for combustion gas compressed air is provided with in main heat exchanger in air separation unit, this leading portion heat exchanger channels is provided with the high-temperature turbine decompressor 41 of a connection band generator on the top of main heat exchanger, combustion gas compressed air outlet on this high-temperature turbine decompressor 41 is connected to the back segment heat exchanger channels in main heat exchanger again, described back segment heat exchanger channels outlet raw air compressor come air converge runner after or be directly communicated with and access in the medium pressure column of rectifying column.
Be provided with between described front heat exchanger 37 and main heat exchanger a pair combustion gas compressed air carry out purifying with except anhydrating, the purification unit 39. of carbon dioxide and hydrocarbon impurity
At least divide after supercooling, purification unit after raw air compressor 2 of the present invention and be connected to two road raw airs, first via raw air connects a High-Pressure Compressor 13 through piping, connecting the supercharger 16 of a cryogenic turboexpander with pipeline after the first cooler, supercharger 16 outlet is connected to the second cooler, connects main heat exchanger 20 afterwards by pipeline; Pick out a branch line at the middle part bifurcated of described main heat exchanger 20 and connect cryogenic turboexpander 22, access in the medium pressure column of described rectifying column afterwards; And directly pick out a pipeline from bottom from main heat exchanger 20 and access in the medium pressure column of described rectifying column directly or indirectly;
Second road raw air directly or indirectly accesses in the medium pressure column of described rectifying column after the second road raw air runner of described main heat exchanger.
Utilize IGCC gas turbine compressed air to produce a method for oxygen, the method is: the heat energy and the pressure energy that utilize IGCC gas turbine compressed air, and produce high pressure oxygen for air separation unit, it comprises following several step:
1) one compressed air 35 is drawn from gas turbine group compressor 31, wherein at least partially by a front heat exchanger, heat exchange is carried out with the dirty nitrogen of air separation unit normal temperature out, dirty nitrogen temperature is made to increase, compressed air is cooled to normal temperature, thus achieves the recovery of compressed air heat energy;
2) compressed air heat energy continues purifying after reclaiming, after purification unit except anhydrating, send into the main heat exchanger 20 of empty point ice chest after carbon dioxide and hydrocarbon impurity;
3) after compressed air guides to main heat exchanger 20, extract out from the top of main heat exchanger 20, then the high-temperature turbine decompressor being sent to a band generator carries out expansion step-down and cooling, high-temperature turbine decompressor drives electrical power generators by mechanical couplings, thus achieves the recovery of compressed air pressure energy;
4) compressed air after cooling continues to carry out heat exchange with adverse current body in main heat exchanger, thus cool further, the raw air come with air separation unit air compressor converges in the rectifying column medium pressure column that enters in ice chest, as a part of raw air of air separation unit.
5) rectifying column described in forms Double-Tower Structure by a medium pressure column and a lower pressure column by main condenser connection, pass through main condenser, medium pressure column provides lower pressure column bottom liquid to evaporate the heat producing upflowing vapor, and lower pressure column provides the condensation of medium pressure column top nitrogen to produce the cold of phegma, in double tower, achieve the separation of oxygen, nitrogen; Obtain liquid oxygen at lower pressure column, liquid oxygen is after at least one liquid oxygen pump compression, and in main heat exchanger, re-heat vaporizes normal temperature as high pressure oxygen product.
Another part raw air as air separation unit of the present invention comes from described air separation unit air compressor, and the air compressor raw air of described air separation unit is divided into following two parts:
Part raw air is delivered to a High-Pressure Compressor and is compressed, and introduces afterwards after main heat exchanger exchanges with body heat of backflowing and cools, then use a high pressure throttling arrangement, send into the bottom of medium pressure column after throttling;
The raw air introducing main heat exchanger of remainder exchanges with fluid thermal of backflowing and is also cooled, and also sends into the bottom of medium pressure column afterwards, participates in the rectifying in medium pressure column.
Embodiment:
The present invention utilizes the heat energy of IGCC gas turbine compressed air and pressure energy to produce high pressure oxygen, which comprises at least the hot-air-turbine decompressor of medium/low pressure double tower, band generator, High-Pressure Compressor, Cryogenic air turbo-expander, main heat exchanger, high-pressure throttle and connection pipeline.
Draw one about 400 DEG C from gas turbine blower 31,1.3MPa(absolute pressure) compressed air 35, guide to heat exchanger 37.In heat exchanger 37, the dirty nitrogen of compressed air 1 and air separation unit normal temperature out carries out heat exchange, and dirty nitrogen temperature rises to about 200 DEG C, and compressed air is cooled to normal temperature, thus achieves the recovery of compressed air heat energy.
Then compressed air introduce purification unit 39 by pipeline 38, in purification unit, purifies compressed air, sends into main heat exchanger 20 except anhydrating, after carbon dioxide and hydrocarbon impurity by pipeline 40.
After compressed air 40 guides to main heat exchanger 20, extract out from the top of main heat exchanger 20, then the high-temperature turbine decompressor 41 being sent to a band generator expands and is depressured to 0.5 ~ 0.6MPa(absolute pressure), preferred 0.55MPa(absolute pressure), compressed air expands and cools to-60 ~-80 DEG C in high-temperature turbine decompressor, high-temperature turbine decompressor drives generator 42 to generate electricity by mechanical couplings, thus achieves the recovery of compressed air pressure energy.
Compressed air 43 after cooling continues to exchange with adverse current body heat at main heat exchanger 20, is cooled to dew-point temperature, and the air (23,27) with air separation unit air compressor converges and enters medium pressure column 29, as 25% raw air of air separation unit.
The air 1 that 75% raw air compresses normal temperature and pressure by air compressor 2 provides.Raw air is incorporated into air cooling compressor 4 by pipeline 3 and is cooled to 15 ~ 20 DEG C, preferably 17 DEG C.Guided to the molecular sieve adsorber (8,9) of one group of alternation by pipeline 6, by the absorption of the adsorbent of molecular sieve of the inside except anhydrating, the impurity such as carbon dioxide and hydrocarbon.
The molecular sieve adsorber (8,9) of alternation, switched every 4 ~ 8 hours and uses container, preferably 6 hours, a job regeneration.Regenerating molecular sieve heating and temperature control is at 170 ~ 200 DEG C, and regeneration gas is air separation unit waste gas 30 out.
Raw air 11 part is guided to High-Pressure Compressor 13 by pipeline 12 and is compressed to 4.0 ~ 5.0 MPa(absolute pressures), preferred 5.0MPa(absolute pressure).Then the supercharger 16 that cooling rear 14 is incorporated into cryogenic turboexpander by pipeline 15 is compressed to supercritical pressure 6.0 ~ 7.5 MPa(absolute pressure), after cooling, 18 are sent to main heat exchanger 20 by pipeline 19.
Part pressure-air is extracted out from the middle part of main heat exchanger 20, is sent to cryogenic turboexpander 22 by pipeline 21.After the expansion of cryogenic turboexpander 22, air cooling-down, to bubble point temperature, converges with other raw air (23,43) and enters medium pressure column 29.
Another partial high pressure air is cooled to dew-point temperature with backflowing after body heat exchanges, and extracts out, be sent to a high pressure throttling arrangement 25, send into the bottom of medium pressure column 29 after throttling by pipeline 24 from the bottom of main heat exchanger 20.
Wherein, high pressure throttling arrangement can be choke valve, also can be liquid expander, preferred liquid decompressor.Relative to choke valve, liquid expander can reduce the irreversible loss of air separation unit.
Raw air 11 part enters main heat exchanger 20 by pipeline 27, exchanges and introduce medium pressure column 29 after being cooled to dew-point temperature with fluid thermal of backflowing.Medium pressure column 29 belongs to stripping tower, and volatile components oxygen, argon do not concentrate in the middle and lower part of medium pressure column 29, and volatile components nitrogen concentrates at the top of medium pressure column 29.
Medium pressure column 29 and lower pressure column 50 connect formation Double-Tower Structure by main condenser 61, by main condenser 61, medium pressure column 29 provides lower pressure column 50 bottom liquid to evaporate the heat producing upflowing vapor, and lower pressure column 50 provides the condensation of medium pressure column 29 top nitrogen to produce the cold of phegma 52, in double tower, achieve the separation of oxygen, nitrogen.The bottom of lower pressure column 50 obtains at least 99.6%(V/V) liquid oxygen of purity, from the liquid oxygen 46 that the bottom of lower pressure column 50 is drawn, compress rear introducing main heat exchanger 20 by High Pressure Liquid Oxygen Pump 45, vaporize normal temperature as high pressure oxygen product 60 with the orthoflow fluid heat exchange of main heat exchanger.
Dirty nitrogen 57 is extracted at the top of lower pressure column 50 out, after main heat exchanger 20 re-heat, enters heat exchange gas 37 heat up by pipeline 59, then enters molecular sieve adsorber (8,9) by pipeline 30 and regenerates.
The refrigeration of this device is realized jointly by cryogenic turboexpander 22 and high-temperature turbine decompressor 41.Low temperature nitrogen decompressor provides the low temperature cold of-177 ~-170 DEG C; High-temperature turbine decompressor 41 provides the high temperature cold of-60 ~-80 DEG C.
Above-described embodiment is only the preferred embodiment of the present invention, and for utilizing IGCC gas turbine compressed air to produce for high pressure oxygen device, can make various modification or optimization, these are also protection scope of the present invention.
Conventional air device produces 1Nm
3/ h high pressure oxygen electric consumption is 0.6 kilowatt. hour, the present invention produces 1Nm
3/ h high pressure oxygen electric consumption is 0.45 kilowatt. hour, be that conventional air device produces 75% of high pressure oxygen electric consumption.Patent of the present invention, if apply, will obtain great economic benefit.
Claims (4)
1. the device utilizing IGCC gas turbine compressed air to produce oxygen, which comprises at least one primarily of raw air compressor, cooling, purification unit, the air separation unit of the rectifying column formation of main heat exchanger and mesolow double tower and main condenser composition, it is characterized in that having one can draw the compressed-air actuated gas turbine group compressor (31) of one combustion gas, one can by described combustion gas compressed air with carry out heat exchange from air separation unit nitrogen at room out before heat exchanger (37); A leading portion heat exchanger channels entered for combustion gas compressed air is provided with in main heat exchanger in air separation unit, this leading portion heat exchanger channels is provided with the high-temperature turbine decompressor (41) of a connection band generator on the top of main heat exchanger, combustion gas compressed air outlet on this high-temperature turbine decompressor (41) is connected to the back segment heat exchanger channels in main heat exchanger again, and the compression air flow channel after described back segment heat exchanger channels outlet raw air compressor also converges in the medium pressure column of rear direct access rectifying column;
At least divide after supercooling, purification unit after described raw air compressor (2) and be connected to two road raw airs, first via raw air connects a High-Pressure Compressor (13) through piping, connecting the supercharger (16) of a cryogenic turboexpander with pipeline after the first cooler, supercharger (16) outlet is connected to the second cooler, connects main heat exchanger (20) afterwards by pipeline; Pick out a branch line at the middle part bifurcated of described main heat exchanger (20) and connect cryogenic turboexpander (22), access in the medium pressure column of described rectifying column afterwards; And pick out a pipeline from the bottom of main heat exchanger (20) and access in the medium pressure column of described rectifying column directly or indirectly; Second road raw air directly or indirectly accesses in the medium pressure column of described rectifying column after the second road raw air runner of described main heat exchanger.
2. produce the device of oxygen according to the IGCC gas turbine compressed air that utilizes described in claim 1, it is characterized in that being provided with between described front heat exchanger (37) and main heat exchanger a pair combustion gas compressed air carry out purifying with except anhydrating, the purification unit (39) of carbon dioxide and hydrocarbon impurity.
3. utilize IGCC gas turbine compressed air to produce a method for oxygen, the method is: the heat energy and the pressure energy that utilize IGCC gas turbine compressed air, and produce high pressure oxygen for air separation unit, it comprises following several step:
1) one compressed air (35) is drawn from gas turbine group compressor (31), wherein at least partially by a front heat exchanger, heat exchange is carried out with the dirty nitrogen of air separation unit normal temperature out, dirty nitrogen temperature is made to increase, compressed air is cooled to normal temperature, thus achieves the recovery of compressed air heat energy;
2) compressed air heat energy continues purifying after reclaiming, after purification unit except anhydrating, send into the main heat exchanger (20) of empty point ice chest after carbon dioxide and hydrocarbon impurity;
3) after compressed air guides to main heat exchanger (20), extract out from the top of main heat exchanger (20), then the high-temperature turbine decompressor being sent to a band generator carries out expansion step-down and cooling, high-temperature turbine decompressor drives electrical power generators by mechanical couplings, thus achieves the recovery of compressed air pressure energy;
4) compressed air after cooling continues to carry out heat exchange with adverse current body in main heat exchanger, thus cool further, the raw air come with air separation unit air compressor converges in the rectifying column medium pressure column that enters in ice chest, as a part of raw air of air separation unit;
5) rectifying column described in forms Double-Tower Structure by a medium pressure column and a lower pressure column by main condenser connection, pass through main condenser, medium pressure column provides lower pressure column bottom liquid to evaporate the heat producing upflowing vapor, and lower pressure column provides the condensation of medium pressure column top nitrogen to produce the cold of phegma, in double tower, achieve the separation of oxygen, nitrogen; Obtain liquid oxygen at lower pressure column, liquid oxygen is after at least one liquid oxygen pump compression, and in main heat exchanger, re-heat vaporizes normal temperature as high pressure oxygen product.
4. the method utilizing IGCC gas turbine compressed air to produce oxygen according to claim 3, the method is: another part raw air as air separation unit comes from described air separation unit air compressor, and the air compressor raw air of described air separation unit is divided into following two parts:
Part raw air is delivered to a High-Pressure Compressor and is compressed, and introduces afterwards after main heat exchanger exchanges with body heat of backflowing and cools, then use a high pressure throttling arrangement, send into the bottom of medium pressure column after throttling;
The raw air introducing main heat exchanger of remainder exchanges with body heat of backflowing and is also cooled, and also sends into the bottom of medium pressure column afterwards, participates in the rectifying in medium pressure column.
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| CN104964516A (en) * | 2015-07-10 | 2015-10-07 | 杭州杭氧股份有限公司 | Partly-integrated type air separation device matched with IGCC power plant and method achieved through partly-integrated type air separation device |
| CN106440659A (en) * | 2016-08-19 | 2017-02-22 | 浙江智海化工设备工程有限公司 | Low energy consumption inner compression air separation device |
| CN110274438A (en) * | 2019-05-27 | 2019-09-24 | 陕西秦风气体股份有限公司 | A kind of air separation unit |
| CN114111218A (en) * | 2020-08-25 | 2022-03-01 | 贵州盈德气体有限公司 | Novel energy-saving process for air separation liquefaction of compressed air |
| CN116780783B (en) * | 2023-08-16 | 2024-01-26 | 势加透博(河南)能源科技有限公司 | Carbon dioxide trapping energy storage system and control method |
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Address after: No.799, Xiangfu Road, Qingshanhu street, Lin'an District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou oxygen generator group Co.,Ltd. Address before: 311241, No. 99, East Ring Road, Qingshan Lake Street, Hangzhou, Zhejiang, Ling'an Patentee before: HANGZHOU HANGYANG Co.,Ltd. |
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Address after: 799 Xiangfu Road, Qingshanhu street, Lin'an District, Hangzhou City, Zhejiang Province Patentee after: Hang Yang Group Co.,Ltd. Address before: 799 Xiangfu Road, Qingshanhu street, Lin'an District, Hangzhou City, Zhejiang Province Patentee before: Hangzhou oxygen generator group Co.,Ltd. |