EP0641982B1 - Verfahren und Einrichtung zur Herstellung von wenigstens einem durch Zerlegung von Luft gewonnenem Gas unter Druck - Google Patents

Verfahren und Einrichtung zur Herstellung von wenigstens einem durch Zerlegung von Luft gewonnenem Gas unter Druck Download PDF

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Publication number
EP0641982B1
EP0641982B1 EP94401838A EP94401838A EP0641982B1 EP 0641982 B1 EP0641982 B1 EP 0641982B1 EP 94401838 A EP94401838 A EP 94401838A EP 94401838 A EP94401838 A EP 94401838A EP 0641982 B1 EP0641982 B1 EP 0641982B1
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European Patent Office
Prior art keywords
pressure
air
column
heat
gas
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EP94401838A
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English (en)
French (fr)
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EP0641982A1 (de
Inventor
Norbert Rieth
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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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Publication of EP0641982A1 publication Critical patent/EP0641982A1/de
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • 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
    • 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
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
    • F25J3/04575—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for a gas expansion plant, e.g. dilution of the combustion gas in a gas turbine
    • F25J3/04581—Hot gas expansion of indirect heated 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04612—Heat exchange integration with process streams, e.g. from the air gas consuming unit
    • F25J3/04618—Heat exchange integration with process streams, e.g. from the air gas consuming unit for cooling an air stream fed to the air fractionation unit
    • 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
    • F25J2200/20—Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • 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
    • F25J2215/52—Oxygen production with multiple purity O2
    • 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
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • 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
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/12—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream the fluid being 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/04—Internal refrigeration with work-producing gas expansion loop

Definitions

  • EP-A-0 552 747 describes a process in which the waste gas from the low pressure column is withdrawn from the exchange line at a temperature intermediate and relaxed in a turbine which ensures the cold resistance of the installation.
  • the invention aims to allow a reduction in the production of liquid for a given oxygen and / or nitrogen production capacity gas under pressure, economically from the point of view of energy performance.
  • the invention also relates to an installation intended for setting using such a method.
  • This installation of the type comprising a double distillation column comprising a low pressure column operating under a pressure known as low pressure and producing a waste gas at the top, and a medium pressure column operating under pressure so-called medium pressure; compression means for bring all of the air to be distilled to at least one high pressure significantly higher than medium pressure, these means comprising a main compressor; of means for withdrawing from the double column and pumping at least one liquid product resulting from the distillation; a heat exchange line connecting heat exchange air and said liquid product; and an expansion turbine for part of this air, the intake of this turbine being connected to an intermediate point of the heat exchange line and its exhaust being connected to the medium pressure column, is characterized in that it includes a second expansion turbine whose admission is linked to the exit of passages from heating of the waste gas from the exchange line thermal, at the hot end of it.
  • the installation shown in Figure 1 is intended to produce gaseous oxygen under high pressure from about 10 to 100 bar, liquid oxygen and liquid nitrogen.
  • This installation essentially includes: a main air compressor 1 itself comprising at minus a medium pressure stage 1A and a high stage pressure 1B; an adsorption purification device 2; a blower-turbine assembly comprising a blower 3 and a turbine 4 whose wheels are set on the same tree; an atmospheric or water cooler 5 for the blower; a heat exchange line 6; a first auxiliary heat exchanger 7 and a second exchanger auxiliary heat 8; a second expansion turbine 9 braked by an alternator 10; a double column of distillation 11 comprising a medium pressure column 12 and a low pressure column 13 coupled by a vaporizer-condenser 14 which puts in exchange relation thermal nitrogen at the top of column 12 and oxygen column 13 tank liquid; an oxygen pump liquid 15; a storage 16 of liquid oxygen at the atmospheric pressure; a storage 17 of liquid nitrogen at atmospheric pressure; a separator pot 18; and one subcooler 19.
  • column 13 is under a pressure from about 1.7 to 5 bar, and column 11 under the corresponding pressure from 6.5 to 16 bars approximately.
  • Liquid oxygen is drawn off in a tank column 13. A fraction goes directly, after sub-cooling in 19 and expansion to atmospheric pressure in an expansion valve 24, in the storage 16, while the rest is brought by pump 15 to the high desired production pressure, then vaporized and reheated at room temperature in the exchange line thermal before being recovered via a pipe 25.
  • liquid nitrogen under the medium pressure withdrawn at the head of column 12, is sub-cooled in 19, expanded to atmospheric pressure in an expansion valve 26, and introduced into the pot separator 18.
  • the liquid phase is sent to the storage 17, while the vapor phase is combined at the impure nitrogen at the top of column 13, then the mixture is reheated in 19 then in 6.
  • the waste gas thus heated at the room temperature is overheated in 7 then relaxed to roughly at atmospheric pressure in 9 and then the gas relaxed is warmed up to 8. It can then, before being evacuated from the installation, serve to regenerate the absorbent device 2.
  • the invention also applies to the production of nitrogen gas under high pressure, carried by a pump (not shown) at the desired high pressure then vaporized in the heat exchange line, and / or to the production of oxygen and / or nitrogen under several pressures, using multiple high air pressures.
  • the vaporization of the liquid (s) can be carried out not concomitantly with air liquefaction, with a knee liquefying air below the oxygen vaporization temperature, or so concomitant with this liquefaction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (8)

  1. Verfahren zur Herstellung von gasförmigem Sauerstoff und/oder gasförmigem Stickstoff unter Druck, bei dem
    Luft in einer Vorrichtung destilliert wird, die einen Hauptluftverdichter (1), eine Destillationsdoppelsäule (11) mit einer unter einem sogenannten Niederdruck arbeitenden Niederdrucksäule (13) und einer unter einem sogenannten Mitteldruck arbeitenden Mitteldrucksäule (12) und eine Wärmeaustauschleitung (6) zum Abkühlen von behandelter Luft aufweist;
    (in 1, 3) die Gesamtheit der zu destillierenden Luft mindestens auf einen Hochdruck der Luft verdichtet wird, der deutlich höher als der Mitteldruck ist;
    die verdichtete Luft auf eine Zwischentemperatur abgekühlt wird und davon ein Teil vor dem Einleiten in die Mitteldrucksäule (12) in einer Turbine (4) auf den Mitteldruck entspannt wird;
    die nicht entspannte Luft verflüssigt, dann nach Entspannung (in 20, 21) in die Doppelsäule eingeleitet wird;
    (in 15) mindestens ein der Doppelsäule unter dem Produktionsdruck entnommenes, flüssiges Produkt zugeführt und dieses flüssige Produkt mittels Wärmeaustausch mit Luft verdampft wird, und
    das Restgas aus dem Kopf der Niederdrucksäule bis zum warmen Ende der Wärmeaustauschleitung erwärmt wird, dadurch gekennzeichnet, daß
    die Niederdrucksäule (13) unter einem Druck von ungefähr 1.7 bis 5 bar und die Mitteldrucksäule (11) unter einem ungefähr 6.5 bis 11 bar entsprechenden Druck betrieben werden; und
    das Restgas aus dem Kopf der Niederdruckkolonne nach Erwärmung bis zum warmen Ende der Wärmeaustauschleitung (6) in einer zweiten Turbine (9) entspannt wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Restgas vor seiner Entspannung mittels Wärmeaustausch (in 7) mit aus einer Zwischenstufe (1A) des Hauptverdichters (1) stammender Luft angewärmt wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das entspannte Restgas (in 8) zum Kühlen der aus der letzten Stufe (1b) des Hauptverdichters (1) stammenden Luft vor der Befreiung dieser Luft von Wasser und Kohlendioxid verwendet wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das flüssige Produkt Rohsauerstoff ist, und daß zudem flüssiger Sauerstoff höherer Reinheit hergestellt wird, der in einen Behälter (16) geleitet wird.
  5. Vorrichtung zur Herstellung von gasförmigem Sauerstoff und/oder gasförmigem Stickstoff unter Druck, umfassend eine Destillationsdoppelsäule (11) mit einer Niederdrucksäule (13), die unter einem sogenannten Niederdruck arbeitet und im Kopf ein Restgas erzeugt, und einer Mitteldruckkolonne (12), die unter einem sogenannten Mitteldruck arbeitet, Verdichtungsmittel (1, 3), um die Gesamtheit der zu destillierenden Luft mindestens auf einen Hochdruck deutlich oberhalb des Mitteldrucks zu bringen, wobei diese Mittel einen Hauptverdichter (1) umfassen, Entnahmemittel (15) an der Doppelsäule und Pumpmittel für mindestens ein durch die Destillation entstandenes, flüssiges Produkt, eine Wärmeaustauschleitung (6) zum Wärmeaustausch zwischen der Luft und dem flüssigen Produkt und eine Entspannungsturbine (4) für einen Teil dieser Luft, wobei der Einlaß dieser Turbine mit einem Zwischenpunkt der Wärmeaustauschleitung und ihr Auslaß mit der Mitteldrucksäule (12) verbunden ist, dadurch gekennzeichnet, daß sie eine zweite Entspannungsturbine (9) umfaßt, deren Einlaß mit dem Auslaß von Kanälen zum Erwärmen des Restgases der Wärmeaustauschleitung (6) am warmen Ende dieser letzten verbunden ist.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß sie einen Wärmeaustauscher (7) umfaßt, der den Wärmeaustausch zwischen dem von dem Auslaß zur zweiten Turbine (9) fließenden Gas und der aus einer Zwischenstufe (1A) des Hauptverdichters (1) stammenden Luft bewirkt.
  7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß sie einen zweiten Wärmeaustauscher (8) umfaßt, der den Wärmeaustausch zwischen dem aus der zweiten Turbine (9) stammenden Gas und der aus der letzten Stufe (1B) des Hauptverdichters (1) stammenden Luft bewirkt.
  8. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß die Niederdrucksäule (13) einen Destillationsteilbereich zwischen einer unteren Entnahmestelle für zum Speichern bestimmtem, flüssigen Sauerstoff und einer mit dem Einlaß der Pumpe (15) verbundenen Entnahmestelle für flüssigen Sauerstoff umfaßt.
EP94401838A 1993-09-01 1994-08-10 Verfahren und Einrichtung zur Herstellung von wenigstens einem durch Zerlegung von Luft gewonnenem Gas unter Druck Expired - Lifetime EP0641982B1 (de)

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FR9310418 1993-09-01
FR9310418A FR2709538B1 (fr) 1993-09-01 1993-09-01 Procédé et installation de production d'au moins un gaz de l'air sous pression.

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EP0641982A1 EP0641982A1 (de) 1995-03-08
EP0641982B1 true EP0641982B1 (de) 1998-05-06

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JP (1) JPH07151459A (de)
CN (1) CN1102700A (de)
CA (1) CA2131121A1 (de)
DE (1) DE69410040T2 (de)
ES (1) ES2118342T3 (de)
FR (1) FR2709538B1 (de)

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US5355682A (en) † 1993-09-15 1994-10-18 Air Products And Chemicals, Inc. Cryogenic air separation process producing elevated pressure nitrogen by pumped liquid nitrogen
FR2730172B1 (fr) * 1995-02-07 1997-03-21 Air Liquide Methode et appareil de surveillance de fonctionnement d'une installation de separation d'air
US20060000358A1 (en) * 2004-06-29 2006-01-05 Rajat Agrawal Purification and delivery of high-pressure fluids in processing applications
CN100443838C (zh) * 2005-04-20 2008-12-17 苏州市兴鲁空分设备科技发展有限公司 一种返流膨胀空气分离的方法和装置
US20070095100A1 (en) * 2005-11-03 2007-05-03 Rankin Peter J Cryogenic air separation process with excess turbine refrigeration
PL2873938T3 (pl) 2013-11-14 2021-11-02 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Sposób i urządzenie do oddzielania powietrza przez destylację kriogeniczną
CN104034123B (zh) * 2014-06-27 2016-05-18 莱芜钢铁集团有限公司 一种空气分离装置积液调纯一体化作业方法
IT202100032876A1 (it) * 2021-12-29 2023-06-29 Rita S R L Impianto e processo per la produzione di ossigeno e azoto gassosi mediante separazione criogenica di una miscela di gas contenente ossigeno ed azoto

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FR2461906A1 (fr) * 1979-07-20 1981-02-06 Air Liquide Procede et installation cryogeniques de separation d'air avec production d'oxygene sous haute pression
FR2652409A1 (fr) * 1989-09-25 1991-03-29 Air Liquide Procede de production frigorifique, cycle frigorifique correspondant et leur application a la distillation d'air.
FR2674011B1 (fr) * 1991-03-11 1996-12-20 Maurice Grenier Procede et installation de production d'oxygene gazeux sous pression.
US5197296A (en) * 1992-01-21 1993-03-30 Praxair Technology, Inc. Cryogenic rectification system for producing elevated pressure product
US5222365A (en) * 1992-02-24 1993-06-29 Praxair Technology, Inc. Cryogenic rectification system for producing high pressure nitrogen product

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JPH07151459A (ja) 1995-06-16
CA2131121A1 (fr) 1995-03-02
FR2709538A1 (fr) 1995-03-10
FR2709538B1 (fr) 1995-10-06
US5463870A (en) 1995-11-07
EP0641982A1 (de) 1995-03-08
CN1102700A (zh) 1995-05-17
DE69410040D1 (de) 1998-06-10
DE69410040T2 (de) 1999-01-28
ES2118342T3 (es) 1998-09-16

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