EP0562893B2 - Verfahren zur Herstellung von Hochdruck-Stickstoff und Sauerstoff - Google Patents

Verfahren zur Herstellung von Hochdruck-Stickstoff und Sauerstoff Download PDF

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Publication number
EP0562893B2
EP0562893B2 EP93400522A EP93400522A EP0562893B2 EP 0562893 B2 EP0562893 B2 EP 0562893B2 EP 93400522 A EP93400522 A EP 93400522A EP 93400522 A EP93400522 A EP 93400522A EP 0562893 B2 EP0562893 B2 EP 0562893B2
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European Patent Office
Prior art keywords
pressure
nitrogen
oxygen
column
compressor
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English (en)
French (fr)
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EP0562893A1 (de
EP0562893B1 (de
Inventor
Yves Koeberle
Jean-Pierre Tranier
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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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04145—Mechanically coupling of different compressors of the air fractionation process to the same driver(s)
    • 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
    • F25J3/04012—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
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
    • F25J3/04121—Steam turbine as the prime mechanical driver
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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
    • 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
    • F25J3/04315—Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
    • 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
    • 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
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
    • 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
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
    • F25J3/04545—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels for the gasification of solid or heavy liquid fuels, e.g. integrated gasification combined cycle [IGCC]
    • 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
    • F25J3/04587—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for the NH3 synthesis, e.g. for adjusting the H2/N2 ratio
    • 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
    • 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
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

Definitions

  • the present invention relates to a process for the simultaneous production of a portion of pure nitrogen under a high nitrogen pressure and secondly oxygen, by air distillation in a double distillation column comprising a medium pressure column and a low pressure column of the "minaret" type producing pure nitrogen at the head.
  • a particular application of the invention is the production simultaneous one part of high purity nitrogen, containing less than 10 ppm oxygen, in large quantities (i.e. representing at least 20% and typically more than 30% of the treated air flow), under 50 to 60 bar, for a ammonia, and secondly purity oxygen manufacturing unit medium to high, i.e. 95 to 99.5 mol%, at a pressure of the order of 65 bar with high extraction yield, for production of hydrogen by reaction of oxygen with heavy hydrocarbons, hydrogen being intended to supply the same manufacturing unit ammonia.
  • Low pressure column of the minaret type means a low pressure column forming part of a double distillation column air, the upper end part of which is supplied at the head by "upper poor liquid” (practically pure nitrogen) withdrawn at the top of the medium pressure and relaxed column, and produces pure nitrogen at the top low pressure.
  • US-A-2,982,108 describes a process for simultaneous production pressurized nitrogen and oxygen in which a compressor is used pressurize the nitrogen produced to a pressure which cannot exceed 40 bar, if it is assumed that the compressor has at most six wheels.
  • the nitrogen compressor and the air compressor can particular be connected to a common motor source.
  • the installation shown in the drawings is intended to produce on the one hand, under 55 bar, high purity nitrogen gas (containing typically less than 10 ppm oxygen), at a flow rate at least equal to 20% of the treated air flow, and on the other hand, under 65 bar, oxygen having a purity from 95 to 99.5%, with a high extraction yield.
  • high purity nitrogen gas containing typically less than 10 ppm oxygen
  • 65 bar oxygen having a purity from 95 to 99.5%
  • the installation essentially comprises an air compressor 1, an apparatus 2 for air purification by adsorption, an exchange line thermal 3 of the counter-current type, a double distillation column 4, an expansion turbine 5, a liquid oxygen pump 6, a compressor of nitrogen 7, an oxygen compressor 8 and an energy source 9 consisting for example by a steam turbine.
  • the double column 4 comprises a medium pressure column 10 surmounted by a low pressure column 11, the end portion of which upper forms an 11A minaret of pure nitrogen production under the lower pressure.
  • a condenser-vaporizer 12 puts in exchange relationship thermal the overhead vapor (practically pure nitrogen) from column 10 and the tank liquid (oxygen from determined purity) of column 11.
  • an equipped pipe an expansion valve 13 makes it possible to raise "liquid rich "(oxygen-enriched air) from the column tank 10 at an intermediate point in column 11; a pipe fitted with an expansion valve 14 allows rise from the "lower lean liquid” (impure nitrogen) of a intermediate point of column 10 at the base of the minaret 11A; and a pipe fitted with an expansion valve 15 makes it possible to raise "upper lean liquid” (nitrogen practically pure) from the head of column 10 to the top minaret.
  • the nitrogen compressor 7 consists of a single three-stage compressor.
  • the first two floors each include two compression wheels and have average compression ratios per wheel of 2 and 1.73 respectively, while the third floor comprises a single compression wheel with a compression ratio of 1.83.
  • the overall compression ratio of the compressor is therefore 22.
  • Each wheel has at its output a refrigerant.
  • the oxygen compressor 8 is also consisting of a single compressor. This compressor has six wheels with an average compression ratio per wheel of 1.37. The overall compression ratio is therefore 6.5.
  • the shaft 16 of the compressor 7 is coupled to the shaft 17 of the compressor 1 by a coupling 18, and the whole is driven by the common energy source 9.
  • the shaft 16 can cause the different compressor 7 stages via speed multipliers suitable for each stage.
  • the compressor 8 is driven by an energy source separate 19.
  • the incoming air is compressed to 11 bars in compressor 1, purified in 2, cooled from the hot end at the cold end of the exchange line 3, and introduced to the near its dew point in tank of column 10.
  • the pure low pressure nitrogen leaving gas from the top of the 11A minaret and warmed to room temperature cold end at the hot end of the exchange line is introduced to the suction of the first stage of the compressor 7, with the possible exception of a nitrogen flow produced at low pressure via line 20.
  • Nitrogen high pressure is produced at the discharge of the third compressor stage and evacuated via line 21.
  • Compressor 7 is also used as nitrogen cycle compressor. Nitrogen medium pressure is drawn off at the top of column 10, via line 22, warmed to room temperature in the exchange line and introduced via a pipe 23 at the suction of the second stage of compressor 7. From nitrogen at high cycle pressure is released at discharge of this second stage via a pipe 24, cooled, liquefied and sub-cooled in the line exchange, expanded at medium pressure in a valve trigger 25 and introduced at the top of column 10.
  • the nitrogen flow flowing in the pipe 24 is greater than the flow rate by a predetermined amount of nitrogen flowing in line 23.
  • the difference constitutes an additional flow of liquid nitrogen, known as rectification support, introduced at reflux at the top of column 10. This flow is taken from the current low pressure nitrogen drawn in from the first stage of the compressor 7.
  • Impure nitrogen constituting the waste gas of the installation, is withdrawn at the base of the minaret 11A via a pipe 25, heated to a temperature intermediary in the exchange line, out of the latter, relaxed at atmospheric pressure in a turbine 5 which keeps the installation cold, then reintroduced into the exchange line, warmed up to room temperature, and finally used to regenerate the adsorption bottles of device 2 and evacuated from the installation via a pipe 26.
  • Oxygen at 65 bar is produced from the next way.
  • the desired liquid oxygen flow is withdrawn in the tank of column 11, brought by pump 6 to a intermediate oxygen pressure, vaporized and heated at room temperature in exchange line 3, then compressed to production pressure by compressor 8.

Claims (3)

  1. Verfahren zur gleichzeitigen Herstellung von einerseits reinem Stickstoff unter einem hohen Stickstoffdruck von 50 bis 60 bar und andererseits Sauerstoff durch Destillation von Luft in einer Doppel-Destillationskolonne (4), umfassend eine Mitteldruckkolonne (10) und eine Niederdruckkolonne (11) nach Art eines "Minaretts", die an ihrem Kopf den reinen Stickstoff liefert, wobei der aus der Niederdruckkolonne (11) austretende Stickstoff nach Erwärmen mittels eines einzigen Stickstoffverdichters (7) des Zentrifugentyps mit höchstens sechs Verdichterrädern auf den hohen Druck verdichtet wird, wobei die Niederdruckkolonne (11) unter einem Druck in der Größenordnung von PN/ρN betrieben wird, wobei PN der hohe Stickstoffdruck und ρN das Verdichtungsverhältnis des genannten Stickstoffverdichters ist, und wobei der Sauerstoff unter einem hohen Sauerstoffdruck von mehr als etwa 10 bar absolut erzeugt wird, am Sumpf der Niederdruckkolonne (11) entnommener flüssiger Sauerstoff mit einer Pumpe (6) auf einen Sauerstoffzwischendruck gebracht und nach Verdampfen und Erwärmen mittels eines einzigen Sauerstoffverdichters (8) des Zentrifugentyps mit höchstens sechs Verdichtungsrädern auf den hohen Sauerstoffdruck verdichtet wird, wobei der Sauerstoffzwischendruck in der Größenordnung von Po/ρo liegt, wobei Po das Verdichtungsverhältnis des genannten Sauerstoffverdichters ist und der einzige dreistufige Stickstoffverdichter (7) mit höchstens zwei Rädern pro Stufe verwendet wird und außerdem die zweite Stufe verwendet wird, um eine Menge Stickstoff aus dem Kreislauf, der aus der Mitteldruckkolonne (10) entnommen und erwärmt wurde, auf einen Zwischendruck zwischen dem mittleren Druck und dem hohen Druck zu verdichten, und der verdichtete Stickstoff aus dem Kreislauf abgekühlt, verflüssigt, auf den mittleren Druck entspannt und am Kopf der Mitteldruckkolonne (10) eingeleitet wird, und außerdem die beiden ersten Stufen verwendet werden, um zur Rektifikationsunterstützung einen Stickstoffstrom, der am Kopf der Niederdruckkolonne (11) entnommen und erwärmt wurde, von dem niedrigen Druck auf einen Zwischendruck zwischen dem mittleren Druck und dem hohen Druck zu verdichten, und dieser verdichtete Stickstoff abgekühlt, verflüssigt, auf den mittleren Druck entspannt und am Kopf der Mitteldruckkolonne (10) eingeleitet wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Stickstoff aus dem Kreislauf auf einen unterkritischen Druck verdichtet wird, bei dem die Kondensationstemperatur des Stickstoffs ein wenig geringer ist als die Verdampfungstemperatur des Sauerstoffs unter dem genannten Sauerstoffzwischendruck.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zur Kühlung der Vorrichtung zur Destillation von Luft aus der Niederdruckkolonne (11) entnommener Rohstickstoff in einer Turbine (5) entspannt wird, wobei dieser Rohstickstoff nach Entspannung und Erwärmung vorzugswiese verwendet wird, um Adsorptionsflaschen (2), die der Reinigung der behandelten Luft dienen, zu regenerieren.
EP93400522A 1992-03-24 1993-03-02 Verfahren zur Herstellung von Hochdruck-Stickstoff und Sauerstoff Expired - Lifetime EP0562893B2 (de)

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FR9203501 1992-03-24
FR9203501A FR2689224B1 (fr) 1992-03-24 1992-03-24 Procede et installation de production d'azote sous haute pression et d'oxygene.

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FR (1) FR2689224B1 (de)
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EP0562893A1 (de) 1993-09-29
DE69310429D1 (de) 1997-06-12
US5341647A (en) 1994-08-30
FR2689224B1 (fr) 1994-05-06
CA2092140C (fr) 1998-08-18
CA2092140A1 (fr) 1993-09-25
ES2101256T3 (es) 1997-07-01
DE69310429T3 (de) 2001-08-23
ES2101256T5 (es) 2001-03-16
FR2689224A1 (fr) 1993-10-01
ZA932796B (en) 1993-09-30
EP0562893B1 (de) 1997-05-07
DE69310429T2 (de) 1997-12-11

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