EP0848220A1 - Method and plant for supplying an air gas at variable quantities - Google Patents
Method and plant for supplying an air gas at variable quantities Download PDFInfo
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- EP0848220A1 EP0848220A1 EP97402990A EP97402990A EP0848220A1 EP 0848220 A1 EP0848220 A1 EP 0848220A1 EP 97402990 A EP97402990 A EP 97402990A EP 97402990 A EP97402990 A EP 97402990A EP 0848220 A1 EP0848220 A1 EP 0848220A1
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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
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
- F25J3/04836—Variable air feed, i.e. "load" or product demand during specified periods, e.g. during periods with high respectively low power costs
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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
- F25J3/0403—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 nitrogen
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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
- F25J3/04036—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 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
- F25J3/04078—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
- F25J3/04084—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 nitrogen
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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
- F25J3/04151—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
- F25J3/04236—Integration of different exchangers in a single core, so-called integrated cores
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F25J3/04248—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
- F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low 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
- F25J3/04248—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
- F25J3/04309—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 nitrogen
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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
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
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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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/50—Oxygen or special cases, e.g. isotope-mixtures or low purity O2
- F25J2215/54—Oxygen production with multiple pressure O2
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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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/50—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being 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
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
- F25J2240/46—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval the fluid being oxygen
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- 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
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/10—Mathematical formulae, modeling, plot or curves; Design methods
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- 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
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/62—Details of storing a fluid in a tank
Definitions
- the present invention relates to a process for supplying a consumer line, during a time interval, a variable demand flow of an air component, in particular of oxygen, produced by an air distillation apparatus. It applies in particular to the supply of pressurized oxygen with highly variable flow.
- the pressures discussed here are absolute pressures, and the flows are flows molars.
- oxygen is used in "batch", with significant variations in flow and at moderately high pressures (of the order of a few bars to about twenty bars).
- moderately high pressures of the order of a few bars to about twenty bars.
- Various solutions are conventionally used in order to follow these changes in debit.
- EP-A-0 422 974 on behalf of the Applicant describes a "rocking" process intended for the production of gaseous oxygen at variable flow.
- Oxygen requested is withdrawn from a tank, pumped to operating pressure, and vaporized by condensation with a variable flow of air to be distilled.
- the compressor, and possibly the booster are significantly oversized compared to the flow nominal oxygen to be produced.
- they work for the majority of the time at high flows different from their nominal flow, and therefore with a degraded yield.
- the right operation of the scale assumes permanent presence a reserve of the two liquids.
- the invention aims to allow the supply of variable-flow air gases in particularly effective and economical conditions.
- the subject of the invention is also a air distillation installation intended for work of the process defined above.
- This installation comprises, according to the invention, means for withdrawing from the distillation apparatus a constant total flow of said constituent; a buffer capacity; of the first means for bringing at least part of said total flow at operating pressure and in gaseous form, these first means being connected to the consumer line; second means for bringing a second flow of said constituting at a high pressure greater than the pressure of use and in gaseous form, these second means being connected to the buffer capacity; and a conduct auxiliary fitted with a controlled expansion valve, connecting the buffer capacity to the consumer line.
- pressure P constant and equal to 16 bars, but it will be understood that this pressure P can also fluctuate around an average value.
- DN the flow nominal of the oxygen production installation. This DN flow is equal to D1 in this example, but, in variant it could be greater than this value if the installation is also intended to provide oxygen to other consumers.
- the flow d1 is sent directly to the user or consumer behavior, while the flow d2 is sent to a buffer or buffer.
- the requested flow D is greater than D1
- This flow d3 is represented by diagram (d).
- FIGS 2, 3 and 5 to 11 show several different installations capable of implement such a method.
- Figures 2 and 3 relate to a installation close to that shown in Figure 1 from US-A-5,329,776, and differ from it only by the addition of an additional racking line 35 of liquid oxygen, of an additional pump 36 adapted to bring this liquid oxygen to the aforementioned pressure P, additional passages 37 of the exchange line thermal, for vaporization and reheating up to the ambient temperature of this oxygen, from a high oxygen storage buffer 38 pressure from the 12-passage pump circuit 17, from a pressure regulator 138 disposed upstream of this buffer, and a line 39 provided with an expansion valve 40, connecting this buffer to the consumer line 15.
- the air distillation installation shown in FIG. 3 essentially comprises: an air compressor 1; an apparatus 2 for purifying the compressed air into water and CO 2 by adsorption, this apparatus comprising two adsorption bottles 2A, 2B, one of which operates in adsorption while the other is being regenerated; a turbine-booster assembly 3 comprising an expansion turbine 4 and a booster 5 whose shafts are coupled; a heat exchanger 6 constituting the heat exchange line of the installation; a double distillation column 7 comprising a medium pressure column 8 surmounted by a low pressure column 9, with a vaporizer-condenser 10 putting the overhead vapor (nitrogen) from column 8 in heat exchange relation with the tank liquid (oxygen) from column 9; a liquid oxygen tank 11, the bottom of which is connected to a liquid oxygen pump 12; and a liquid nitrogen tank 13, the bottom of which is connected to a liquid nitrogen pump 14.
- This facility is intended to provide, via a user line 15, gaseous oxygen under the operating pressure P.
- liquid oxygen drawn from the column 9 tank via line 16 and stored in the reservoir 11 is brought to the high pressure P1 (30 bars) by the pump 12 in the liquid state, then vaporized and heated under this high pressure in passages 17 of the exchanger 6, under the conditions of FIG. 1 (c), and sent to buffer 38. Under the conditions of Figure 1 (d), this oxygen is expanded at 40 and sent to the line 15 via line 39.
- the heat necessary for this vaporization and to this reheating, as well as to reheating and possibly vaporization of other fluids drawn from the double column, is supplied by the air to be distilled, in the following conditions.
- All of the air to be distilled is compressed by compressor 1 at a first high pressure significantly higher than the average column pressure 8 of use. Then the air, precooled in 18 and cooled to around room temperature in 19, is purified in one, 2A for example, of the bottles adsorption, and fully boosted by the booster 5, which is driven by the turbine 4.
- Air is then introduced at the hot end of exchanger 6 and completely cooled to a intermediate temperature. At this temperature, a fraction of the air continues to cool and is liquefied in passages 20 of the exchanger, then is relaxed at low pressure in an expansion valve 21 and introduced at an intermediate level in the column 9. The rest of the air is relaxed to average pressure in turbine 4 then sent directly, via a pipe 22, at the base of column 8.
- Low pressure nitrogen is heated in passages 28 of exchanger 6 then evacuated via a pipe 29, while the waste gas, after heating in passages 30 of the exchanger, is used to regenerate an adsorption bottle, the 2B bottle in the example considered, before being evacuated via a pipe 31.
- part medium pressure liquid nitrogen is, after expansion in an expansion valve 32, stored in the tank 13, and that a production of liquid nitrogen and / or oxygen liquid is supplied via line 33 (for nitrogen) and / or 34 (for oxygen).
- the pressure of the compressed air at 5 is the air condensation pressure by heat exchange with oxygen being vaporized under pressure of use P, i.e. the pressure for which air liquefaction knee 100, on the diagram heat exchange is located slightly to the right of the vertical bearing 101 for vaporizing oxygen under the pressure P ( Figure 4).
- the temperature difference at the end heat of the exchange line is adjusted by means of the turbine 4, the suction temperature of which is indicated in 102.
- pumps 12 and 36 can be connected in series, the pump suction 12 being stitched on the delivery line of the pump 36.
- Figure 5 shows a variant installation which differs from the previous one by the removal of pump 36 and of the vaporization-heating circuit corresponding.
- Figures 7 and 8 show another variant of the installation which does not differ from that of Figures 2 and 3 only by the fact that the oxygen at 16 bars is withdrawn in gaseous form from the column tank low pressure 9, via a line 44, heated under the low pressure in passages 45 of the exchange line 6, and brought to 16 bars by an oxygen compressor 46.
- Oxygen at 30 bar is drawn from the tank 11 by pump 12, which brings it to this high pressure in liquid form and then is vaporized and warmed in passages 17, and is sent directly to buffer 38.
- Figures 9 and 10 illustrate the implementation work of the invention with a conventional apparatus of air distillation without pump, nitrogen cycle (turbine 47 releasing at low pressure medium pressure nitrogen) and an argon separation column (not shown) coupled to the low pressure column by two lines 48.
- the oxygen flow D1 is withdrawn in gaseous form from the bottom column tank pressure and, after heating, is compressed to 16 bars and / or at 30 bars, under the conditions described above, by two respective oxygen compressors 49 and 50.
- the compressor 49 discharges directly into line 15, while compressor 50 backs up in buffer 38.
- Figures 11 and 12 does not differs from the previous one only in that the two oxygen compressors are connected in series instead to be mounted in parallel. So the compressor 49 compresses the entire flow D1 to 16 bars, and the compressor 50 carries from 16 to 30 bars the flow d2 described next to Figure 1 (c).
- compressors 49 and 50 can be made up of two floors or groups stages of the same machine.
- operating pressure means the pressure in line 15. However, this does not exclude a subsequent modification of this pressure, for example by expansion.
- the pressure regulator 138 can be deleted.
- the buffer pressure then changes between pressures P and P1 as a function of time.
- the method of the invention can use multiple buffers at high pressures P1, P2, ... different, all significantly greater than the operating pressure P.
- gas is then taken from one or the other of the buffers, according to the variations of this flow.
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Abstract
Description
La présente invention est relative à un procédé pour fournir à une conduite consommatrice, pendant un intervalle de temps, un débit demandé variable d'un constituant de l'air, notamment d'oxygène, produit par un appareil de distillation d'air. Elle s'applique en particulier à la fourniture d'oxygène sous pression à débit fortement variable.The present invention relates to a process for supplying a consumer line, during a time interval, a variable demand flow of an air component, in particular of oxygen, produced by an air distillation apparatus. It applies in particular to the supply of pressurized oxygen with highly variable flow.
Les pressions dont il est question ici sont des pressions absolues, et les débits sont des débits molaires.The pressures discussed here are absolute pressures, and the flows are flows molars.
Dans certaines activités industrielles telles que la sidérurgie des fours à arc électrique ou l'affinage de cuivre, l'oxygène est utilisé en "batch", avec des variations importantes de débit et à des pressions moyennement élevées (de l'ordre de quelques bars à une vingtaine de bars). Diverses solutions sont classiquement utilisées afin de suivre ces évolutions de débit.In certain industrial activities such that the steel industry of electric arc furnaces or copper refining, oxygen is used in "batch", with significant variations in flow and at moderately high pressures (of the order of a few bars to about twenty bars). Various solutions are conventionally used in order to follow these changes in debit.
Par exemple, EP-A-0 422 974 au nom de la Demanderesse décrit un procédé "à bascule" destiné à la production d'oxygène gazeux à débit variable. L'oxygène demandé est soutiré d'un réservoir, porté par pompage à la pression d'utilisation, et vaporisé par condensation d'un débit variable d'air à distiller.For example, EP-A-0 422 974 on behalf of the Applicant describes a "rocking" process intended for the production of gaseous oxygen at variable flow. Oxygen requested is withdrawn from a tank, pumped to operating pressure, and vaporized by condensation with a variable flow of air to be distilled.
Dans ce procédé connu, il est facile de montrer que pour maintenir constants les débits d'alimentation et de soutirage de l'appareil de distillation, il est nécessaire de faire varier le débit d'air entrant dans le même sens que les variations de la consommation d'oxygène. Dans le cas où l'oxygène est produit sous pression, l'air que l'on condense pour vaporiser l'oxygène liquide est surpressé par un surpresseur additionnel, et, lorsque la demande en oxygène varie, il faut faire varier de façon importante à la fois le débit surpressé et le débit comprimé par le compresseur principal.In this known process, it is easy to show that to keep the flow rates constant supply and withdrawal of the distillation apparatus, it is necessary to vary the air flow going in the same direction as the variations of the oxygen consumption. In the event that oxygen is pressurized product, the air that is condensed for vaporize liquid oxygen is boosted by a booster additional, and when the oxygen demand varies, you have to vary significantly at a time the boosted flow and the compressed flow by the compressor main.
Par conséquent, dans ce procédé connu, le compresseur, et éventuellement le surpresseur, sont surdimensionnés de façon importante par rapport au débit nominal d'oxygène à produire. De plus, ils travaillent pendant la majorité du temps à des débits fortement différents de leur débit nominal, et donc avec un rendement dégradé. A ceci s'ajoute le fait que le bon fonctionnement de la bascule suppose la présence permanente d'une réserve des deux liquides.Therefore, in this known method, the compressor, and possibly the booster, are significantly oversized compared to the flow nominal oxygen to be produced. In addition, they work for the majority of the time at high flows different from their nominal flow, and therefore with a degraded yield. Added to this is the fact that the right operation of the scale assumes permanent presence a reserve of the two liquids.
Il a également été proposé de stocker du gaz à produire, sous forme gazeuse, dans une capacité auxiliaire ou "buffer", à une pression supérieure à la pression de production. Cependant, cette solution n'est pas satisfaisante, car elle nécessite la mise en place de buffers de très grande dimension pour faire face à des pointes de consommation de longue durée. De plus, la production de la totalité du gaz à la pression du buffer est coûteuse en énergie.It has also been proposed to store gas to produce, in gaseous form, in a capacity auxiliary or "buffer", at a pressure higher than the production pressure. However, this solution is not not satisfactory, because it requires the installation very large buffers to deal with long-term consumption peaks. In addition, the production of all gas at buffer pressure is costly in energy.
L'invention a pour but de permettre la fourniture de gaz de l'air à débit variable dans des conditions particulièrement efficaces et économiques.The invention aims to allow the supply of variable-flow air gases in particularly effective and economical conditions.
A cet effet, l'invention a pour objet un procédé pour fournir à une conduite consommatrice, pendant un intervalle de temps, un débit demandé variable d'un constituant de l'air, notamment d'oxygène, produit par un appareil de distillation d'air, caractérisé en ce que :
- on soutire de l'appareil un débit total dudit constituant de valeur constante;
- on divise l'intervalle de temps en plusieurs
types de périodes, à savoir :
- éventuellement, au moins une première période pendant laquelle le débit demandé est égal audit débit total;
- au moins une deuxième période pendant laquelle le débit demandé est inférieur audit débit total; et
- au moins une troisième période pendant laquelle le débit demandé est supérieur audit débit total;
- pendant ladite ou lesdites premières périodes, on amène ledit débit total à la pression d'utilisation, et on l'envoie à la conduite consommatrice;
- pendant ladite ou lesdites deuxièmes
périodes :
- on amène le débit demandé à la pression d'utilisation, et on l'envoie à la conduite consommatrice; et
- on amène à une haute pression supérieure à la pression d'utilisation un débit de stockage dudit constituant égal à la différence entre ledit débit total et le débit demandé, et on stocke ce débit de stockage dans au moins une capacité- tampon; et
- pendant ladite ou lesdites troisièmes
périodes :
- on amène ledit débit total à la pression d'utilisation, et on l'envoie à la conduite consommatrice; et
- on envoie en outre dans la conduite consommatrice un débit complémentaire dudit constituant égal à la différence entre le débit demandé et ledit débit total, ce débit complémentaire étant prélevé dans au moins une capacité-tampon et détendu à la pression d'utilisation.
- a total flow of said constituent of constant value is withdrawn from the apparatus;
- we divide the time interval into several types of periods, namely:
- optionally, at least a first period during which the requested flow is equal to said total flow;
- at least a second period during which the requested flow is lower than said total flow; and
- at least a third period during which the requested flow is greater than said total flow;
- during said one or more first periods, said total flow is brought to the operating pressure, and it is sent to the consuming line;
- during said second period (s):
- the requested flow rate is brought to the operating pressure, and it is sent to the consuming line; and
- a storage flow rate of said constituent is brought to a high pressure higher than the operating pressure equal to the difference between said total flow rate and the requested flow rate, and this storage flow rate is stored in at least one buffer capacity; and
- during said third period (s):
- the said total flow is brought to the operating pressure, and it is sent to the consuming line; and
- in addition, a complementary flow of said constituent is sent to the consuming line, equal to the difference between the requested flow and said total flow, this additional flow being taken from at least one buffer capacity and expanded to the operating pressure.
Le procédé suivant l'invention peut comporter une ou plusieurs des caractéristiques suivantes :
- on soutire ledit débit total sous forme liquide de l'appareil de distillation, et on le comprime sous cette forme par pompage avant de le vaporiser;
- on amène à la pression d'utilisation un premier débit de liquide au moyen d'une première pompe, on amène à la haute pression le débit destiné à la capacité-tampon au moyen d'une seconde pompe, et on vaporise chaque flux de liquide sous sa pression de pompage;
- on amène ledit débit total à la pression d'utilisation au moyen d'une pompe unique, on vaporise ce liquide et on porte à la haute pression la fraction du gaz ainsi obtenu qui est destinée à la capacité-tampon;
- on amène ledit débit total à la haute pression au moyen d'une pompe unique, on détend une fraction de ce débit total à la pression d'utilisation, et on vaporise les deux flux chacun sous sa pression;
- on soutire sous forme liquide de l'appareil de distillation un premier débit, on le comprime par pompage, et on le vaporise sous cette pression; et on soutire sous forme gazeuse de l'appareil de distillation le reste dudit débit total, et on le comprime sous cette forme;
- on soutire ledit débit total sous forme gazeuse de l'appareil de distillation, on comprime à la pression d'utilisation une fraction de ce gaz, et on comprime à la haute pression le débit complémentaire destiné à la capacité-tampon;
- on comprime chaque débit indépendamment à partir de la pression de soutirage de l'appareil de distillation;
- on comprime ledit débit total à la pression d'utilisation, et on comprime une fraction de ce premier débit de la pression d'utilisation à la haute pression.
- said total flow rate is drawn off in liquid form from the distillation apparatus, and it is compressed in this form by pumping before vaporizing it;
- a first flow of liquid is brought to the operating pressure by means of a first pump, the flow intended for the buffer capacity is brought to high pressure by means of a second pump, and each flow of liquid is vaporized under its pumping pressure;
- the said total flow is brought to the operating pressure by means of a single pump, this liquid is vaporized and the fraction of the gas thus obtained which is intended for the buffer capacity is brought to high pressure;
- said total flow is brought to high pressure by means of a single pump, a fraction of this total flow is relaxed to the operating pressure, and the two flows are each vaporized under its pressure;
- a first flow is drawn off in liquid form from the distillation apparatus, it is compressed by pumping, and it is vaporized under this pressure; and the remainder of said total flow rate is drawn off in gaseous form from the distillation apparatus, and it is compressed in this form;
- said total flow is drawn off in gaseous form from the distillation apparatus, a fraction of this gas is compressed at the operating pressure, and the additional flow intended for the buffer capacity is compressed at high pressure;
- each flow is compressed independently from the withdrawal pressure of the distillation apparatus;
- said total flow is compressed at the operating pressure, and a fraction of this first flow is compressed from the operating pressure to the high pressure.
L'invention a également pour objet une installation de distillation d'air destinée à la mise en oeuvre du procédé défini ci-dessus. Cette installation comprend, suivant l'invention, des moyens pour soutirer de l'appareil de distillation un débit total constant dudit constituant; une capacité-tampon; des premiers moyens pour amener une partie au moins dudit débit total à la pression d'utilisation et sous forme gazeuse, ces premiers moyens étant reliés à la conduite consommatrice; des seconds moyens pour amener un second débit dudit constituant à une haute pression supérieure à la pression d'utilisation et sous forme gazeuse, ces seconds moyens étant reliés à la capacité-tampon; et une conduite auxiliaire munie d'une vanne de détente commandée, reliant la capacité-tampon à la conduite consommatrice.The subject of the invention is also a air distillation installation intended for work of the process defined above. This installation comprises, according to the invention, means for withdrawing from the distillation apparatus a constant total flow of said constituent; a buffer capacity; of the first means for bringing at least part of said total flow at operating pressure and in gaseous form, these first means being connected to the consumer line; second means for bringing a second flow of said constituting at a high pressure greater than the pressure of use and in gaseous form, these second means being connected to the buffer capacity; and a conduct auxiliary fitted with a controlled expansion valve, connecting the buffer capacity to the consumer line.
Suivant diverses caractéristiques optionnelles de cette installation :
- les premiers moyens comprennent une première pompe et des premiers moyens de vaporisation, et les seconds moyens comprennent une seconde pompe et des seconds moyens de vaporisation;
- les premiers moyens comprennent une pompe et des moyens de vaporisation, et les seconds moyens comprennent un compresseur dont l'aspiration est reliée à la sortie des moyens de vaporisation;
- les premiers moyens comprennent une pompe, une vanne de détente et des premiers moyens de vaporisation, et les seconds moyens comprennent des seconds moyens de vaporisation reliés au refoulement de la pompe;
- les premiers moyens comprennent un compresseur dont l'aspiration est reliée à un point de soutirage de gaz de l'appareil de distillation, et les seconds moyens comprennent une pompe et des moyens de vaporisation reliés au refoulement de cette pompe;
- les premiers et les seconds moyens comprennent respectivement deux compresseurs dont les aspirations sont reliées en parallèle à un point de soutirage de l'appareil de distillation ;
- les premiers moyens comprennent un premier compresseur dont l'aspiration est reliée à un point de soutirage de gaz de l'appareil de distillation, et les seconds moyens comprennent un second compresseur dont l'aspiration est reliée au refoulement du premier compresseur.
- the first means comprise a first pump and first spray means, and the second means comprise a second pump and second spray means;
- the first means comprise a pump and vaporization means, and the second means comprise a compressor whose suction is connected to the outlet of the vaporization means;
- the first means comprise a pump, an expansion valve and first vaporization means, and the second means comprise second vaporization means connected to the discharge of the pump;
- the first means comprise a compressor, the suction of which is connected to a gas withdrawal point of the distillation apparatus, and the second means comprise a pump and vaporization means connected to the discharge of this pump;
- the first and second means respectively comprise two compressors, the aspirations of which are connected in parallel to a withdrawal point of the distillation apparatus;
- the first means comprise a first compressor, the suction of which is connected to a gas withdrawal point of the distillation apparatus, and the second means comprise a second compressor, the suction of which is connected to the discharge of the first compressor.
Des exemples de mises en oeuvre de l'invention vont maintenant être décrits en regard des dessins annexés sur lesquels :
- la Figure 1 illustre le procédé de l'invention au moyen de quatre diagrammes (a) à (d) ;
- la Figure 2 représente très schématiquement une installation suivant l'invention;
- la Figure 3 représente la même installation de manière plus détaillée;
- la Figure 4 est un diagramme d'échange thermique correspondant à cette installation, avec en abscisses les températures (en °C) et en ordonnées les quantités de chaleur échangées;
- les Figures 5
et 6 sont des vues analogues à la Figure 2, relatives respectivement à deux variantes de l'installation; - la Figure 7 est une vue analogue à la Figure 2 d'une autre variante de l'installation;
- la Figure 8 est une vue analogue à la Figure 3 correspondant à l'installation de la Figure 7;
- les Figures 9 et 10 d'une part, 11 et 12
d'autre part, représentent deux autres modes de réalisation
de l'installation, de manière analogue aux Figures
2
et 3 respectivement.
- Figure 1 illustrates the process of the invention by means of four diagrams (a) to (d);
- Figure 2 very schematically shows an installation according to the invention;
- Figure 3 shows the same installation in more detail;
- FIG. 4 is a heat exchange diagram corresponding to this installation, with the temperatures on the abscissa (in ° C.) and the quantities of heat exchanged on the ordinate;
- Figures 5 and 6 are views similar to Figure 2, respectively relating to two variants of the installation;
- Figure 7 is a view similar to Figure 2 of another variant of the installation;
- Figure 8 is a view similar to Figure 3 corresponding to the installation of Figure 7;
- Figures 9 and 10 on the one hand, 11 and 12 on the other hand, represent two other embodiments of the installation, similarly to Figures 2 and 3 respectively.
La Figure 1 (a) illustre une courbe simplifiée de demande d'oxygène sous une pression d'utilisation P, au cours d'une période de temps s'étendant d'un temps t = 0 à un temps T. Dans ce qui suit, on supposera la pression P constante et égale à 16 bars, mais on comprendra que cette pression P peut également fluctuer autour d'une valeur moyenne.Figure 1 (a) illustrates a simplified curve oxygen demand under pressure of use P, over a period of time extending from a time t = 0 to a time T. In which follows, we will assume the pressure P constant and equal to 16 bars, but it will be understood that this pressure P can also fluctuate around an average value.
La demande variable d'oxygène est par exemple celle d'une installation sidérurgique à fours à arc électrique et comporte six intervalles de temps successifs :
- de t = 0 à t1, le débit demandé est nul;
- de t1 à t2, le débit demandé est D1;
- de t2 à t3, le débit demandé est D2 > D1;
- de t3 à t4, le débit demandé est D3 > D2;
- de t4 à t5, le débit demandé est D4 < D1;
- de t5 à T, le débit demandé est nul.
- from t = 0 to t1, the requested flow is zero;
- from t1 to t2, the requested bit rate is D1;
- from t2 to t3, the requested flow is D2>D1;
- from t3 to t4, the requested bit rate is D3>D2;
- from t4 to t5, the requested bit rate is D4 <D1;
- from t5 to T, the requested flow is zero.
On a également indiqué par DN le débit nominal de l'installation de production d'oxygène. Ce débit DN est égal à D1 dans cet exemple, mais, en variante, il pourrait être supérieur à cette valeur, si l'installation est destinée à fournir également de l'oxygène à d'autres consommateurs.We also indicated by DN the flow nominal of the oxygen production installation. This DN flow is equal to D1 in this example, but, in variant it could be greater than this value if the installation is also intended to provide oxygen to other consumers.
La Figure 1(b) représente la production dl d'oxygène à 16 bars par l'installation. Cette production varie comme suit :
- de t = 0 à t1 : d1 = 0
- de t1 à t4, c'est-à-dire lorsque la demande en oxygène est supérieure ou égale à D1 : d1 = D1;
- de t4 à t5, c'est-à-dire lorsque la demande en oxygène est supérieure à O mais inférieure à D1 : d1 = D4;
- de t5 à T : d1 = 0.
- from t = 0 to t1: d1 = 0
- from t1 to t4, that is to say when the oxygen demand is greater than or equal to D1: d1 = D1;
- from t4 to t5, that is to say when the oxygen demand is greater than O but less than D1: d1 = D4;
- from t5 to T: d1 = 0.
La Figure 1 (c) représente la production d2 d'oxygène à une haute pression P1 nettement supérieure à 16 bars, typiquement de l'ordre de 30 bars :
- de t = 0 à t1 : d2 = D1;
- de t1 à t4 : d2 = 0;
- de t4 à t5 : d2 = D1 - D4;
- de t5 à T : d2 = D1.
- from t = 0 to t1: d2 = D1;
- from t1 to t4: d2 = 0;
- from t4 to t5: d2 = D1 - D4;
- from t5 to T: d2 = D1.
On voit donc que, sur toute la période 0, T,
on a en permanence d1 + d2 = D1, débit constant considéré
comme "débit total" d'oxygène, vis-à-vis de l'utilisation
considérée.We therefore see that, over the
Le débit d1 est directement envoyé à la conduite utilisatrice ou consommatrice, tandis que le débit d2 est envoyé à une capacité-tampon ou buffer. Lorsque le débit D demandé est supérieur à D1, soit de t2 à t4, le complément d3 = D - D1 est prélevé dans la capacité-tampon, détendu à la pression d'utilisation et introduit dans la conduite consommatrice. Ce débit d3 est représenté par le diagramme (d).The flow d1 is sent directly to the user or consumer behavior, while the flow d2 is sent to a buffer or buffer. When the requested flow D is greater than D1, either by t2 to t4, the complement d3 = D - D1 is taken from the buffer capacity, relaxed to operating pressure and introduced into the consumer line. This flow d3 is represented by diagram (d).
Ainsi, la demande d'oxygène est fournie :
- de t1 à t2 et de t4 à t5, uniquement par
la
production d'oxygène sous 16 bars, et - de t2 à t4, partiellement par cette production sous 16 bars et partiellement par de l'oxygène prélevé dans la capacité-tampon et détendu.
- from t1 to t2 and from t4 to t5, only by producing oxygen at 16 bars, and
- from t2 to t4, partially by this production at 16 bars and partially by oxygen taken from the buffer capacity and expanded.
Les Figures 2, 3 et 5 à 11 représentent plusieurs installations différentes capables de mettre en oeuvre un tel procédé.Figures 2, 3 and 5 to 11 show several different installations capable of implement such a method.
Les Figures 2 et 3 sont relatives à une
installation voisine de celle représentée à la Figure 1
du US-A-5 329 776, et ne diffèrent de celle-ci que par
l'ajout d'une ligne additionnelle 35 de soutirage
d'oxygène liquide, d'une pompe additionnelle 36 adaptée
pour porter cet oxygène liquide à la pression P précitée,
de passages additionnelles 37 de la ligne d'échange
thermique, pour la vaporisation et le réchauffage
jusqu'au voisinage de la température ambiante de cet
oxygène, d'un buffer 38 de stockage de l'oxygène haute
pression provenant du circuit pompe 12-passages 17, d'un
régulateur de pression 138 disposé en amont de ce buffer,
et d'une ligne 39 munie d'une vanne de détente 40,
reliant ce buffer à la conduite consommatrice 15.Figures 2 and 3 relate to a
installation close to that shown in Figure 1
from US-A-5,329,776, and differ from it only by
the addition of an
Ainsi, comme décrit dans le US-A-5 329 776
précité, l'installation de distillation d'air représentée
à la Figure 3 comprend essentiellement : un compresseur
d'air 1; un appareil 2 d'épuration de l'air comprimé en
eau et en CO2 par adsorption, cet appareil comprenant
deux bouteilles d'adsorption 2A, 2B dont l'une fonctionne
en adsorption pendant que l'autre est en cours de
régénération; un ensemble turbine-surpresseur 3 comprenant
une turbine de détente 4 et un surpresseur 5 dont
les arbres sont couplés; un échangeur de chaleur 6
constituant la ligne d'échange thermique de
l'installation; une double colonne de distillation 7
comprenant une colonne moyenne pression 8 surmontée d'une
colonne basse pression 9, avec un vaporiseur-condenseur
10 mettant la vapeur de tête (azote) de la colonne 8 en
relation d'échange thermique avec le liquide de cuve
(oxygène) de la colonne 9; un réservoir d'oxygène liquide
11 dont le fond est relié à une pompe d'oxygène liquide
12; et un réservoir d'azote liquide 13 dont le fond est
relié à une pompe d'azote liquide 14.Thus, as described in the aforementioned US-A-5,329,776, the air distillation installation shown in FIG. 3 essentially comprises: an
Cette installation est destinée à fournir,
via une conduite utilisatrice 15, de l'oxygène gazeux
sous la pression d'utilisation P.This facility is intended to provide,
via a
Pour cela, de l'oxygène liquide soutiré de la
cuve de la colonne 9 via une conduite 16 et stocké dans
le réservoir 11, est amené à la haute pression P1 (30
bars) par la pompe 12 à l'état liquide, puis vaporisé et
réchauffé sous cette haute pression dans des passages 17
de l'échangeur 6, dans les conditions de la Figure 1(c),
et envoyé au buffer 38. Dans les conditions de la Figure
1(d), cet oxygène est détendu en 40 et envoyé dans la
conduite 15 via la conduite 39.For this, liquid oxygen drawn from the
La chaleur nécessaire à cette vaporisation et à ce réchauffage, ainsi qu'au réchauffage et éventuellement à la vaporisation d'autres fluides soutirés de la double colonne, est fournie par l'air à distiller, dans les conditions suivantes.The heat necessary for this vaporization and to this reheating, as well as to reheating and possibly vaporization of other fluids drawn from the double column, is supplied by the air to be distilled, in the following conditions.
La totalité de l'air à distiller est comprimée
par le compresseur 1 à une première haute pression
nettement supérieure à la moyenne pression de la colonne
8 d'utilisation. Puis l'air, prérefroidi en 18 et
refroidi au voisinage de la température ambiante en 19,
est épuré dans l'une, 2A par exemple, des bouteilles
d'adsorption, et surpressé en totalité par le surpresseur
5, lequel est entraíné par la turbine 4.All of the air to be distilled is compressed
by
L'air est alors introduit au bout chaud de
l'échangeur 6 et refroidi en totalité jusqu'à une
température intermédiaire. A cette température, une
fraction de l'air poursuit son refroidissement et est
liquéfiée dans des passages 20 de l'échangeur, puis est
détendue à la basse pression dans une vanne de détente
21 et introduite à un niveau intermédiaire dans la
colonne 9. Le reste de l'air est détendue à la moyenne
pression dans la turbine 4 puis envoyé directement, via
une conduite 22, à la base de la colonne 8.Air is then introduced at the hot end of
On reconnait par ailleurs sur la Figure 3 les
conduites habituelles des installations à double colonne,
celle représentée étant du type dit "à minaret", c'est-à-dire
avec production d'azote sous la basse pression : les
conduites 23 à 25 d'injection dans la colonne 9, à des
niveaux croissants, de "liquide riche" (air enrichi en
oxygène) détendu, de "liquide pauvre inférieur" (azote
impur) détendu et de "liquide pauvre supérieur" (azote
pratiquement pur) détendu, respectivement, ces trois
fluides étant respectivement soutirés à la base, en un
point intermédiaire et au sommet de la colonne 8; et les
conduites 26 de soutirage d'azote gazeux partant du
sommet de la colonne 9 et 27 d'évacuation du gaz résiduaire
(azote impur) partant du niveau d'injection du
liquide pauvre inférieur. L'azote basse pression est
réchauffé dans des passages 28 de l'échangeur 6 puis
évacué via une conduite 29, tandis que le gaz résiduaire,
après réchauffement dans des passages 30 de l'échangeur,
est utilisé pour régénérer une bouteille d'adsorption,
la bouteille 2B dans l'exemple considéré, avant d'être
évacué via une conduite 31.We also recognize in Figure 3 the
normal pipes in double column installations,
that represented being of the type known as "minaret", that is to say
with nitrogen production under low pressure:
On voit encore sur la Figure 3 qu'une partie
de l'azote liquide moyenne pression est, après détente
dans une vanne de détente 32, stockée dans le réservoir
13, et qu'une production d'azote liquide et/ou d'oxygène
liquide est fournie via une conduite 33 (pour l'azote)
et/ou 34 (pour l'oxygène).We can still see in Figure 3 that part
medium pressure liquid nitrogen is, after expansion
in an
De plus, de l'oxygène liquide supplémentaire
soutiré du réservoir 11 par la pompe 36 est vaporisé et
réchauffé sous la pression d'utilisation de 16 bars dans
des passages 37, dans les conditions de la Figure 1(b).In addition, additional liquid oxygen
withdrawn from the
La pression de l'air surpressé en 5 est la
pression de condensation de l'air par échange de chaleur
avec l'oxygène en cours de vaporisation sous la pression
d'utilisation P, c'est-à-dire la pression pour laquelle
le genou 100 de liquéfaction de l'air, sur le diagramme
d'échange thermique est situé légèrement à droite du
palier vertical 101 de vaporisation de l'oxygène sous la
pression P (Figure 4). L'écart de température au bout
chaud de la ligne d'échange est ajusté au moyen de la
turbine 4, dont la température d'aspiration est indiquée
en 102.The pressure of the compressed air at 5 is the
air condensation pressure by heat exchange
with oxygen being vaporized under pressure
of use P, i.e. the pressure for which
En ce qui concerne ce débit d'oxygène haute
pression, son palier 103 de vaporisation (Figure 4) est
décalé vers la droite par rapport au genou 100 de
liquéfaction de l'air surpressé, mais reste inférieur,
dans cet exemple, à la température du point 102.Regarding this high oxygen flow
pressure, its vaporization level 103 (Figure 4) is
shifted to the right with respect to the
Au cours de l'intervalle de temps O, T, la longueur de chaque palier 101, 103 varie, mais la somme des deux longueurs reste constante.During the time interval O, T, the length of each bearing 101, 103 varies, but the sum of the two lengths remains constant.
Par rapport à une installation analogue à une
seule pompe 12, c'est-à-dire telle que celle de la Figure
1 du US-A-5 329 776 précité, on obtient, toutes choses
égales par ailleurs, un gain d'énergie dû à la présence
du palier 101 en regard du genou 100. Cet excédent
d'énergie peut se valoriser soit en évacuant de
l'installation un supplément de liquide, généralement de
l'azote liquide, soit en abaissant la pression de
compression de l'air en 1, en maintenant bien entendu le
genou 100 à droite du palier 101. Le gain d'énergie
précité fluctue, au cours de l'intervalle de temps O, T,
avec la longueur du palier 101.Compared to an installation similar to a
La Figure 2 schématise la même installation en représentant seulement :
- la boíte froide 41 de l'installation, qui en contient les parties cryogéniques;
- les deux pompes à oxygène liquide 12
et 36, lesquelles, en pratique, sont bien entendu contenues dans la boíte froide; et - la conduite consommatrice 15,
le buffer 38, laligne 39 et la vanne de détente 40.
- the
cold box 41 of the installation, which contains the cryogenic parts thereof; - the two liquid oxygen pumps 12 and 36, which, in practice, are of course contained in the cold box; and
- the
consumer line 15, thebuffer 38, theline 39 and theexpansion valve 40.
On a ainsi schématisé le fait que les deux
productions d'oxygène, respectivement sous 16 bars et
sous 30 bars, dont la somme des débits est constamment
égale à D1, sont fournies par compression-vaporisation-réchauffement
de deux débits d'oxygène liquide provenant
de la colonne basse pression 9.We have thus schematized the fact that the two
oxygen production, respectively under 16 bars and
under 30 bars, whose sum of flows is constantly
equal to D1, are supplied by compression-vaporization-heating
two liquid oxygen flows from
of the
En variante, au lieu d'être branchées en
parallèle sur le réservoir 11, les pompes 12 et 36
peuvent être montées en série, l'aspiration de la pompe
12 étant piquée sur la conduite de refoulement de la
pompe 36.Alternatively, instead of being plugged in
parallel on
La Figure 5 représente une variante
d'installation qui diffère de la précédente par la
suppression de la pompe 36 et du circuit de vaporisation-réchauffement
correspondant.Figure 5 shows a variant
installation which differs from the previous one by the
removal of
Ainsi, la totalité du débit D1 est amenée par
la pompe 12 à 16 bars, vaporisé, réchauffé et envoyé dans
la conduite 15.Thus, the entire flow D1 is brought by
the
Dans les conditions de la Figure 1(c), de
l'oxygène est prélevé en un point 42 de la conduite 15,
comprimé à 30 bars par un compresseur d'oxygène 43 et
envoyé au buffer 38. Ce dernier est comme précédemment
relié à la conduite 15 par la conduite 39 équipée de la
vanne 40.Under the conditions of Figure 1 (c), of
the oxygen is taken from a
Dans la variante de la Figure 6, l'unique
pompe 12 amène le débit D1 à 30 bars. Une fraction de ce
débit est détendue à 16 bars dans une vanne de détente
143 et vaporisée, dans les conditions de la Figure 1(b),
et envoyée à la conduite 15. Le reste du liquide est
vaporisé sous la haute pression de 30 bars et envoyé au
buffer 38.In the variant of Figure 6, the
Les Figures 7 et 8 représentent une autre
variante de l'installation qui ne diffère de celle des
Figures 2 et 3 que par le fait que l'oxygène à 16 bars
est soutiré sous forme gazeuse de la cuve de la colonne
basse pression 9, via une conduite 44, réchauffé sous la
basse pression dans des passages 45 de la ligne d'échange
6, et porté à 16 bars par un compresseur d'oxygène 46.
L'oxygène à 30 bars, quant à lui, est soutiré du réservoir
11 par la pompe 12, qui l'amène à cette haute
pression sous forme liquide, puis est vaporisé et
réchauffé dans les passages 17, et est envoyé directement
au buffer 38.Figures 7 and 8 show another
variant of the installation which does not differ from that of
Figures 2 and 3 only by the fact that the oxygen at 16 bars
is withdrawn in gaseous form from the column tank
Dans les modes de réalisation qui précèdent, il est possible d'ajouter une capacité-tampon d'air liquide, afin d'amortir les variations dans le temps du débit d'air liquéfié alimentant la double colonne.In the foregoing embodiments, it is possible to add an air buffer capacity liquid, to absorb variations over time liquefied air flow supplying the double column.
Les Figures 9 et 10 illustrent la mise en
oeuvre de l'invention avec un appareil classique de
distillation d'air sans pompe, à cycle azote (turbine 47
détendant à la basse pression de l'azote moyenne pression)
et à colonne de séparation d'argon (non représentée)
couplée à la colonne basse pression par deux
conduites 48.Figures 9 and 10 illustrate the implementation
work of the invention with a conventional apparatus of
air distillation without pump, nitrogen cycle (
Dans ce cas, le débit D1 d'oxygène est
soutiré sous forme gazeuse de la cuve de la colonne basse
pression et, après réchauffement, est comprimé à 16 bars
et/ou à 30 bars, dans les conditions décrites plus haut,
par deux compresseurs d'oxygène respectifs 49 et 50. Le
compresseur 49 refoule directement dans la conduite 15,
tandis que le compresseur 50 refoule dans le buffer 38.In this case, the oxygen flow D1 is
withdrawn in gaseous form from the bottom column tank
pressure and, after heating, is compressed to 16 bars
and / or at 30 bars, under the conditions described above,
by two
L'installation des Figures 11 et 12 ne
diffère de la précédente que par le fait que les deux
compresseurs d'oxygène sont montés en série au lieu
d'être montés en parallèle. Ainsi, le compresseur 49
comprime la totalité du débit D1 à 16 bars, et le
compresseur 50 porte de 16 à 30 bars le débit d2 décrit
en regard de la Figure 1(c).The installation of Figures 11 and 12 does not
differs from the previous one only in that the two
oxygen compressors are connected in series instead
to be mounted in parallel. So the
Bien entendu, les compresseurs 49 et 50
peuvent être constitués par deux étages ou groupes
d'étages d'une même machine.Of course,
Dans tout ce qui précède, on a appelé
"pression d'utilisation" la pression de la conduite 15.
Toutefois, ceci n'exclut pas une modification ultérieure
de cette pression, par exemple par détente.In all of the above, we have called
"operating pressure" means the pressure in
Par ailleurs, dans chaque mode de réalisation
de l'installation, le régulateur de pression 138 peut
être supprimé. La pression du buffer évolue alors entre
les pressions P et P1 en fonction du temps.Furthermore, in each embodiment
of the installation, the
En variante encore, le procédé de l'invention peut utiliser plusieurs buffers à des hautes pressions P1, P2, ... différentes, toutes nettement supérieures à la pression d'utilisation P. Lorsque le débit demandé est supérieur à D1, on prélève alors du gaz dans l'un ou l'autre des buffers, suivant les variations de ce débit.In another variant, the method of the invention can use multiple buffers at high pressures P1, P2, ... different, all significantly greater than the operating pressure P. When the requested flow is greater than D1, gas is then taken from one or the other of the buffers, according to the variations of this flow.
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9615281A FR2757282B1 (en) | 1996-12-12 | 1996-12-12 | METHOD AND INSTALLATION FOR PROVIDING A VARIABLE FLOW OF AN AIR GAS |
FR9615281 | 1996-12-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0848220A1 true EP0848220A1 (en) | 1998-06-17 |
EP0848220B1 EP0848220B1 (en) | 2004-02-18 |
Family
ID=9498600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97402990A Revoked EP0848220B1 (en) | 1996-12-12 | 1997-12-10 | Method and plant for supplying an air gas at variable quantities |
Country Status (13)
Country | Link |
---|---|
US (1) | US5941098A (en) |
EP (1) | EP0848220B1 (en) |
JP (1) | JPH10259990A (en) |
KR (1) | KR100474464B1 (en) |
CN (1) | CN1130538C (en) |
AR (1) | AR008937A1 (en) |
BR (1) | BR9705641A (en) |
CA (1) | CA2224742A1 (en) |
DE (1) | DE69727648T2 (en) |
ES (1) | ES2216119T3 (en) |
FR (1) | FR2757282B1 (en) |
PL (1) | PL323709A1 (en) |
ZA (1) | ZA9711131B (en) |
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EP0895045A2 (en) * | 1997-07-30 | 1999-02-03 | Linde Aktiengesellschaft | Air separation process |
WO2016025063A1 (en) * | 2014-07-28 | 2016-02-18 | Praxair Technolgy, Inc. | Air separation method and apparatus |
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FR2751737B1 (en) * | 1996-07-25 | 1998-09-11 | Air Liquide | METHOD AND INSTALLATION FOR PRODUCING A VARIABLE FLOW AIR GAS |
DE10013075A1 (en) * | 2000-03-17 | 2001-09-20 | Linde Ag | Process for recovering gaseous nitrogen by the decomposition of air in a distillation column system comprises removing a part of the nitrogen-rich liquid from the condenser-vaporizer as a liquid product |
US6357259B1 (en) * | 2000-09-29 | 2002-03-19 | The Boc Group, Inc. | Air separation method to produce gaseous product |
EP1207362A1 (en) | 2000-10-23 | 2002-05-22 | Air Products And Chemicals, Inc. | Process and apparatus for the production of low pressure gaseous oxygen |
EP1202013B3 (en) * | 2000-10-23 | 2009-04-01 | Air Products And Chemicals, Inc. | Process and apparatus for the production of low pressure gaseous oxygen |
GB0219415D0 (en) * | 2002-08-20 | 2002-09-25 | Air Prod & Chem | Process and apparatus for cryogenic separation process |
FR2854683B1 (en) * | 2003-05-05 | 2006-09-29 | Air Liquide | METHOD AND INSTALLATION FOR PRODUCING PRESSURIZED AIR GASES BY AIR CRYOGENIC DISTILLATION |
FR2872262B1 (en) * | 2004-06-29 | 2010-11-26 | Air Liquide | METHOD AND INSTALLATION FOR PROVIDING SUPPORT OF A PRESSURIZED GAS |
US7409835B2 (en) * | 2004-07-14 | 2008-08-12 | Air Liquide Process & Construction, Inc. | Backup system and method for production of pressurized gas |
AU2005225027A1 (en) * | 2005-07-21 | 2007-02-08 | L'air Liquide Societe Anonyme Pour L'etude Et L"Exploitation Des Procedes Georges Claude | Process and apparatus for the separation of air by cryogenic distillation |
FR2895068B1 (en) * | 2005-12-15 | 2014-01-31 | Air Liquide | AIR SEPARATION METHOD BY CRYOGENIC DISTILLATION |
JP4688843B2 (en) * | 2007-05-07 | 2011-05-25 | 株式会社神戸製鋼所 | Air separation device |
US7821158B2 (en) * | 2008-05-27 | 2010-10-26 | Expansion Energy, Llc | System and method for liquid air production, power storage and power release |
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US8623107B2 (en) | 2009-02-17 | 2014-01-07 | Mcalister Technologies, Llc | Gas hydrate conversion system for harvesting hydrocarbon hydrate deposits |
JP5407661B2 (en) * | 2009-08-26 | 2014-02-05 | Jfeスチール株式会社 | Oxygen supply equipment and oxygen supply method |
CN102072612B (en) * | 2010-10-19 | 2013-05-29 | 上海加力气体有限公司 | N-type pattern energy-saving gas manufacturing method |
CN103575064B (en) * | 2012-07-23 | 2015-10-28 | 中国石油化工股份有限公司 | A kind of air separation oxygen nitrogen increases the device and method of pressure nitrogen gas load fast |
US9631863B2 (en) * | 2013-03-12 | 2017-04-25 | Mcalister Technologies, Llc | Liquefaction systems and associated processes and methods |
US8907524B2 (en) | 2013-05-09 | 2014-12-09 | Expansion Energy Llc | Systems and methods of semi-centralized power storage and power production for multi-directional smart grid and other applications |
US10119756B2 (en) | 2013-10-23 | 2018-11-06 | Praxair Technology, Inc. | Oxygen backup method and system |
US20150168056A1 (en) * | 2013-12-17 | 2015-06-18 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method For Producing Pressurized Gaseous Oxygen Through The Cryogenic Separation Of Air |
DE102016004606A1 (en) * | 2016-04-14 | 2017-10-19 | Linde Aktiengesellschaft | Process engineering plant and process for liquefied gas production |
US10260801B2 (en) * | 2016-06-30 | 2019-04-16 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes George Claude | Method for operating an air separation plant |
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-
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- 1997-12-10 ES ES97402990T patent/ES2216119T3/en not_active Expired - Lifetime
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- 1997-12-10 EP EP97402990A patent/EP0848220B1/en not_active Revoked
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- 1997-12-11 JP JP9341721A patent/JPH10259990A/en active Pending
- 1997-12-11 AR ARP970105832A patent/AR008937A1/en unknown
- 1997-12-12 US US08/990,085 patent/US5941098A/en not_active Expired - Fee Related
- 1997-12-12 CA CA002224742A patent/CA2224742A1/en not_active Abandoned
- 1997-12-12 PL PL97323709A patent/PL323709A1/en unknown
- 1997-12-12 CN CN97125391.9A patent/CN1130538C/en not_active Expired - Fee Related
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WO2016025063A1 (en) * | 2014-07-28 | 2016-02-18 | Praxair Technolgy, Inc. | Air separation method and apparatus |
Also Published As
Publication number | Publication date |
---|---|
CN1130538C (en) | 2003-12-10 |
FR2757282B1 (en) | 2006-06-23 |
JPH10259990A (en) | 1998-09-29 |
ES2216119T3 (en) | 2004-10-16 |
DE69727648D1 (en) | 2004-03-25 |
US5941098A (en) | 1999-08-24 |
BR9705641A (en) | 1999-05-25 |
EP0848220B1 (en) | 2004-02-18 |
KR100474464B1 (en) | 2005-06-17 |
ZA9711131B (en) | 1998-06-23 |
PL323709A1 (en) | 1998-06-22 |
CA2224742A1 (en) | 1998-06-12 |
KR19980063916A (en) | 1998-10-07 |
CN1190726A (en) | 1998-08-19 |
DE69727648T2 (en) | 2004-10-14 |
AR008937A1 (en) | 2000-02-23 |
FR2757282A1 (en) | 1998-06-19 |
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