EP0718576B1 - Verfahren zur Trennung eines Gasgemisches durch kryogene Destillation - Google Patents

Verfahren zur Trennung eines Gasgemisches durch kryogene Destillation Download PDF

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Publication number
EP0718576B1
EP0718576B1 EP95402924A EP95402924A EP0718576B1 EP 0718576 B1 EP0718576 B1 EP 0718576B1 EP 95402924 A EP95402924 A EP 95402924A EP 95402924 A EP95402924 A EP 95402924A EP 0718576 B1 EP0718576 B1 EP 0718576B1
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EP
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Prior art keywords
refrigerant
gas mixture
flow
process according
pressure
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English (en)
French (fr)
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EP0718576A1 (de
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Philippe Fraysse
Mike De L'isle
Daniel Rousseau
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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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
    • 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
    • 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
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • 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
    • 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
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04339—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air
    • F25J3/04345—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air and comprising a gas work expansion loop
    • 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
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F25J3/04357—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen and comprising a gas work expansion loop
    • 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
    • F25J3/044—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 single pressure main column system only
    • 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
    • F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead gas
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—Nitrogen
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen

Definitions

  • Climatic conditions are important in the design air separation devices and, more generally, in devices cryogenic. More particularly, the water for cooling the refrigerants of the various stages of compression of the air compressor can vary depending on the climate and even between day and night, so important in some countries so that one can save in these country temperature fluctuations on the water of the order of 15 ° C.
  • the refrigeration unit has the disadvantage of being of a expensive investment and to use at least one rotating machine, which is unreliable and energy consuming.
  • US-A-4,375,367 describes a system in which an air flow at distiller is cooled before being purified by recycling the air produced by the purification system.
  • a refrigeration unit is essential in this case.
  • EP-A-0.624.765A discloses a system which makes it possible to substitute the refrigeration unit by a heat exchange system with a flow of pressurized fluid from the air separation plant. Usage of a cycle fluid to cool the air upstream of the purification system is not described.
  • This patent application also does not disclose a installation in which the air is precooled in an auxiliary exchanger with only one other fluid.
  • JP-A-54103777 describes the use of a nitrogen flow coming from a distillation column to cool the air to be purified.
  • EP-A-0.505.812 discloses that an air flow to be purified can be cooled with a purified air flow, before the expansion of the latter.
  • the subject of the invention is a method as described above, characterized in that liquid is produced as the final product and at least part of the refrigerant is expanded in a expansion before it exchanges heat with the non-gas mixture refined.
  • the proposed solution applies to all distillation apparatus a gaseous mixture containing oxygen and nitrogen and which, for this, use a refrigeration cycle, for example a gas or nitrogen mixture. It is well suited to liquid production devices.
  • the invention applies in particular to small appliances for production of liquid by air distillation using a nitrogen cycle capable to supply the air with the necessary extra refrigeration for its refrigeration up to its purification temperature.
  • the invention may consist in installing at the outlet of the final refrigerant from the air compressor an auxiliary exchanger allowing, for example, heat exchange between compressed air with a fraction of cycle nitrogen taken at an intermediate level of a main exchanger. Compressed air is thus cooled by the cycle nitrogen which is heated in this exchanger auxiliary, then remixed with the rest of the cycle nitrogen which continued to heating in the main exchanger.
  • the invention also relates to a separation installation of a gaseous mixture containing nitrogen and oxygen by distillation cryogenic comprising a compressor, a purification system, a main exchanger, at least one distillation column, means constituting a refrigeration system and an auxiliary exchanger which puts the gas mixture compressed by the compressor in exchange relationship thermal with a refrigerant coming either from the column or from the feed downstream of the purification system, characterized in that it includes means for withdrawing a liquid product and a machine for expansion to relax at least part of the refrigerant upstream of the auxiliary exchanger.
  • an air flow is compressed to 6 X 10 5 Pa by a compressor 1 and cooled to 40 ° C in a water cooler 3. Then the flow enters the auxiliary exchanger 5 where it cools down to 25 ° C by heat exchange with a nitrogen flow rate of 6 ⁇ 10 5 Pa.
  • Separator pots (not shown) at the outlet of the refrigerant 3 and of the exchanger 5 make it possible to remove the condensed water from the treated air after cooling.
  • the air is cooled in the main exchanger 9 near its dew point, then sent to a double tank conventional column 11 in which the air is separated into liquid oxygen, residual nitrogen at the pressure of the low pressure column (1.3 ⁇ 10 5 Pa) and gaseous and liquid nitrogen substantially pure at the pressure of the medium pressure column (6 ⁇ 10 5 Pa).
  • the flow rate of substantially pure nitrogen gas is heated in the main exchanger 9 to a temperature of 22 ° C., from which the first flow rate 13A of pure nitrogen is drawn off by the draw-off valve 15 before passing into l auxiliary exchanger 5 where it cools the supply air to 25 ° C.
  • the nitrogen of cycle 13A is thus heated to 37 ° C.
  • a second flow of pure gaseous nitrogen 13B continues to heat up in the main exchanger 9 up to 35 ° C. and joins the first flow 13A after it has passed through the auxiliary exchanger 5.
  • the combined flows are recompressed to 42 bar in the compressor 21 and cooled in the main exchanger 9.
  • a third flow 13C of recompressed pure nitrogen is expanded in the turbine 23 of 42X 10 5 Pa up to 6 X 10 5 Pa and recycled with the nitrogen gas withdrawn from the column at 6X 10 5 Pa.
  • the compressor 21 is coupled to the turbine 23.
  • the residual nitrogen heats up in the main exchanger 9, is further heated in the electric heater 8 and is used to regenerate one of the beds of adsorbent he 7.
  • the water temperature can reach 20-22 ° C. Under these conditions, the compressed air will come out of the final refrigerant of the compressor 1 at a temperature close to 25 ° C and valve 15 will be closed.
  • the water temperature can reach 30-32 ° C and the air leaving the final refrigerant of compressor 1 will be at a temperature close to 40 ° C.
  • Cycle nitrogen 13A will then be sent at a sufficient rate by valve 15 opens sufficiently for the temperature of the outlet air of the auxiliary exchanger 5 is close to 25 ° C.
  • the system has no refrigeration units, the entire cooling capacity being provided by the nitrogen cycle.
  • the system in Figure 2 differs from that in Figure 1 in that the nitrogen cycle is replaced by an air cycle (the gas mixture at distill).
  • the equipment remains essentially the same.
  • the air flow is compressed in the compressor 17 to 30 X 10 5 Pa, cooled in the exchanger 19 and recompressed by the compressor 21 to 42 X 10 5 Pa. Then, the air cools in the main exchanger 9.
  • An air flow 13C is withdrawn after being partially cooled, the remaining part of the air therefore being liquefied and sent to column 11.
  • the flow 13C is expanded to 6 X 10 5 Pa in the turbine 23. A part of this expanded air is sent to the column 11 as a gas supply and the rest of the air is heated in the exchanger 9.
  • a flow 13A of this air is partially heated, drawn off by the valve 15 and sent to the auxiliary exchanger 5 where it cools all the supply air to 25 ° C.
  • the flow 13A then joins the air to be compressed in the compressor 17.
  • the air flow 13B continues to heat up and joins the supply air downstream of the purification system 7.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (21)

  1. Verfahren zur Trennung eines Stickstoff und Sauerstoff enthaltenden Gasgemisches durch Destillation in einer Tieftemperaturapparatur, umfassend die folgenden Stufen:
    Kompression des Gasgemisches,
    Reinigung des komprimierten Gasgemisches von Wasser und Kohlendioxid,
    Abkühlung des gereinigten Gasgemisches bis in den Bereich seines Taupunkts,
    Destillation des abgekühlten Gasgemisches in mindestens einer Destillationskolonne (11), und
    Liefern der Kälteenergie für die Apparatur durch ein anderes Kühlsystem als eine Tiefkühleinheit, bei dem man mindestens einen Teil des Gasgemisches zwischen der Kompressions- und der Reinigungsstufe durch indirekten Wärmeaustausch mit einer Menge (13B) Kältefluid abkühlt, das ein Produkt der Destillationskolonne ist oder einen Teil des zu destillierenden Gasgemisches darstellt, dadurch gekennzeichnet, daß man als Endprodukt eine Flüssigkeit herstellt und mindestens einen Teil des Kältefluids vor dem Wärmeaustausch mit dem ungereinigten Gasgemisch in einer Entspannungsmaschine entspannt.
  2. Verfahren nach Anspruch 1, bei dem das Kühlsystem ein Kältekreislauf ist.
  3. Verfahren nach Anspruch 2, bei dem das Kältefluid, mit dem das Gasgemisch Wärme austauscht, das Fluid des Kältekreislaufs ist.
  4. Verfahren nach Anspruch 2 oder 3, bei dem das Kühlsystem ein Luft- oder Stickstoffkreislauf ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Menge (13B) an Kältefluid zum Konstanthalten der Temperatur des Teils des Gasgemisches reguliert wird.
  6. Verfahren nach einem der vorhergehenden Ansprüche, bei dem man das Gasgemisch durch ein Permeations- und/oder Adsorptionssystem (7) von Wasser und Kohlendioxid reinigt.
  7. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Menge (13B) an Kältefluid eine durch eine Mitteldruckkolonne einer zweigeteilten Destillationskolonne (11) produzierte Stickstoffmenge ist.
  8. Verfahren nach einem der vorhergehenden Ansprüche, bei dem mindestens ein Teil des Gasgemisches oder der Kältefluidmenge verflüssigt und in die Destillationskolonne (11) eingeführt wird.
  9. Verfahren nach einem der vorhergehenden Ansprüche, bei dem das Kühlsystem die Einführung einer Menge von einer äußeren Quelle kommender kalter Flüssigkeit in die Destillationskolonne (11) umfaßt.
  10. Verfahren nach einem der vorhergehenden Ansprüche, bei dem mindestens ein Teil des Kältefluids vor der Entspannung auf höheren Druck gebracht wird.
  11. Verfahren nach einem der vorhergehenden Ansprüche, bei dem das Kältefluid nach seiner Entspannung gegen das gereinigte Gasgemisch teilweise wieder erwärmt wird.
  12. Vorrichtung zur Trennung eines Stickstoff und Sauerstoff enthaltenden Gasgemisches durch Tieftemperaturdestillation, umfassend einen Kompressor (1), ein Reinigungssystem (7), einen Hauptaustauscher (9j, mindestens eine Destillationskolonne (11) und Mittel (17, 21, 23), die ein Kühlsystem und einen Hilfsaustauscher (5) darstellen, der das durch den Kompressor (1) komprimierte Gasgemisch in Wärmeaustauschbeziehung mit einem entweder von der Kolonne (11) kommenden oder nach dem Reinigungssystem (7) zugeführten Kältefluid setzt, dadurch gekennzeichnet, daß sie Mittel zum Abziehen eines flüssigen Produkts und eine Entspannungsmaschine (23) zum Entspannen mindestens eines Teils des Kältefluids vor dem Hilfsaustauscher enthält.
  13. Vorrichtung nach Anspruch 12, bei der ein Regelventil (15) die dem Hilfsaustauscher (5) zugeführte Menge Kältefluid steuert.
  14. Vorrichtung nach Anspruch 12 oder 13, bei der das Kältefluid im Kühlkreislauf umläuft.
  15. Vorrichtung nach einem der Ansprüche 12 bis 14, bei der das Kältefluid von einer Mitteldruckkolonne einer zweigeteilten Kolonne (11) kommender gasförmiger Stickstoff oder ein Teil des Gasgemisches ist.
  16. Vorrichtung nach einem der Ansprüche 12 bis 15, bei der das Reinigungssystem (7) durch Adsorption und/oder Permeation arbeitet.
  17. Vorrichtung nach einem der Ansprüche 12 bis 16, enthaltend Mittel (17, 19, 21) zum Verflüssigen des Kältefluids nach dem Hilfsaustauscher (5) und zur Führung mindestens eines Teils zu der Destillationskolonne (11).
  18. Vorrichtung nach einem der Ansprüche 12 bis 17, enthaltend mindestens einen Kompressor (17, 21), der das Kältefluid nach dem Hilfsaustauscher (5) komprimiert.
  19. Vorrichtung nach einem der Ansprüche 12 bis 18, enthaltend Mittel zum Einführen einer Menge von einer äußeren Quelle kommender Flüssigkeit in die Destillationskolonne (11).
  20. Vorrichtung nach einem der Ansprüche 12 bis 19, bei der der Hilfsaustauscher (5) das Gasgemisch in Wärmeaustauschbeziehung mit einem einzigen Kältefluid setzt.
  21. Vorrichtung nach einem der Ansprüche 12 bis 20, umfassend Mittel (17, 21) zur Erhöhung des Drucks des zur Entspannung bestimmten Teils des Kältefluids.
EP95402924A 1994-12-23 1995-12-22 Verfahren zur Trennung eines Gasgemisches durch kryogene Destillation Expired - Lifetime EP0718576B1 (de)

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FR9415608A FR2728663B1 (fr) 1994-12-23 1994-12-23 Procede de separation d'un melange gazeux par distillation cryogenique
FR9415608 1994-12-23

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EP0718576B1 true EP0718576B1 (de) 1999-09-01

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DE (1) DE69511833T2 (de)
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DE19720453A1 (de) * 1997-05-15 1998-11-19 Linde Ag Verfahren und Vorrichtung zur Gewinnung von Stickstoff durch Tieftemperaturzerlegung von Luft
US5806342A (en) * 1997-10-15 1998-09-15 Praxair Technology, Inc. Cryogenic rectification system for producing low purity oxygen and high purity oxygen
US5968234A (en) * 1998-04-14 1999-10-19 Air Products And Chemicals, Inc. Temperature swing adsorption with regeneration by elevated pressure ASU nitrogen-enriched gas
FR2790823B1 (fr) * 1999-03-12 2001-06-15 Air Liquide Procede et installation de purification et de separation d'air par voie cryogenique sans pre-refroidissement
FR2807150B1 (fr) * 2000-04-04 2002-10-18 Air Liquide Procede et appareil de production d'un fluide enrichi en oxygene par distillation cryogenique
US6543253B1 (en) 2002-05-24 2003-04-08 Praxair Technology, Inc. Method for providing refrigeration to a cryogenic rectification plant
US7225637B2 (en) * 2004-12-27 2007-06-05 L'Air Liquide Société Anonyme á´ Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Integrated air compression, cooling, and purification unit and process
CN100441990C (zh) * 2006-08-03 2008-12-10 西安交通大学 利用空分制冷系统的小型天然气液化装置
US8601833B2 (en) * 2007-10-19 2013-12-10 Air Products And Chemicals, Inc. System to cold compress an air stream using natural gas refrigeration
US9546814B2 (en) 2011-03-16 2017-01-17 8 Rivers Capital, Llc Cryogenic air separation method and system
EP2505948B1 (de) 2011-03-30 2018-10-10 General Electric Technology GmbH Kryogene CO2-Trennung mithilfe eines Kühlsystems
FR2976059B1 (fr) * 2011-05-31 2013-05-31 Air Liquide Appareil et procede integre de separation d'un melange de dioxyde de carbone et au moins un autre gaz et de separation d'air par distillation cryogenique
CN102425574A (zh) * 2011-10-20 2012-04-25 河北东明中硅科技有限公司 多晶硅系统制氮制动风机用空气的处理方法
CN103438665B (zh) * 2013-09-01 2015-06-17 杭州哲达科技股份有限公司 降低空分设备综合电单耗的装置及方法
WO2018042336A2 (en) 2016-08-30 2018-03-08 8 Rivers Capital, Llc Cryogenic air separation method for producing oxygen at high pressures
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FR2728663A1 (fr) 1996-06-28
CN1133964A (zh) 1996-10-23
ES2138172T3 (es) 2000-01-01
US5651271A (en) 1997-07-29
DE69511833D1 (de) 1999-10-07
EP0718576A1 (de) 1996-06-26
FR2728663B1 (fr) 1997-01-24
JPH08254389A (ja) 1996-10-01
CA2165916A1 (fr) 1996-06-24
DE69511833T2 (de) 2000-05-18

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