EP0384483A2 - Procédé et dispositif de rectification d'air - Google Patents

Procédé et dispositif de rectification d'air Download PDF

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Publication number
EP0384483A2
EP0384483A2 EP90103572A EP90103572A EP0384483A2 EP 0384483 A2 EP0384483 A2 EP 0384483A2 EP 90103572 A EP90103572 A EP 90103572A EP 90103572 A EP90103572 A EP 90103572A EP 0384483 A2 EP0384483 A2 EP 0384483A2
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EP
European Patent Office
Prior art keywords
nitrogen
pressure
fraction
compressed
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90103572A
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German (de)
English (en)
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EP0384483A3 (en
EP0384483B1 (fr
Inventor
Dietrich Dipl.-Ing. Rottmann
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Linde GmbH
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Linde GmbH
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Priority claimed from DE19893905521 external-priority patent/DE3905521A1/de
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0384483A2 publication Critical patent/EP0384483A2/fr
Publication of EP0384483A3 publication Critical patent/EP0384483A3/de
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Publication of EP0384483B1 publication Critical patent/EP0384483B1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04854—Safety aspects of operation
    • F25J3/0486—Safety aspects of operation of vaporisers for oxygen enriched liquids, e.g. purging of liquids
    • 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
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • F25J3/04206—Division of the main heat exchange line in consecutive sections having different functions including a so-called "auxiliary vaporiser" for vaporising and producing a gaseous product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/0423—Subcooling of liquid process streams
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    • 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
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04327—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 argon or argon enriched stream
    • 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
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
    • F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
    • F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
    • 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
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04709—Producing crude argon in a crude argon column as an auxiliary column system in at least a dual pressure main column system
    • 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
    • F25J2230/42—Processes or apparatus involving steps for increasing the pressure of gaseous process streams 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/52—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being oxygen enriched compared to air, e.g. "crude oxygen"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/58—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being argon or crude argon
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/40—One fluid being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/50—One fluid being oxygen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00—Refrigeration
    • Y10S62/923—Inert gas
    • Y10S62/924—Argon

Definitions

  • the invention relates to a method for air separation by rectification, in which air is compressed, pre-cleaned, cooled and pre-separated in the pressure stage of a two-stage rectification into a nitrogen-rich fraction and an oxygen-rich liquid, and the two fractions are at least partially fed to the medium-pressure stage of the rectification and in oxygen and nitrogen are broken down, at least one gaseous nitrogen fraction being led out, heated and at least partially relaxed in a work-performing manner.
  • the invention also relates to a device for carrying out the method.
  • the object of the invention is to improve the economy of the method and the device of the type mentioned at the outset and, in particular, to provide process cooling in a particularly advantageous manner without restricting the further use of the gaseous nitrogen fraction.
  • This object is achieved in that at least part of the nitrogen which has been expanded to perform the work is heated and compressed again, at least part of the work obtained during the relaxation being used for the compression.
  • the expanded nitrogen content can be brought back to its original pressure (before decompression) or to a higher pressure if it is to be used further with the appropriate parameters.
  • the recompressed nitrogen can be fed into the combustion chamber, which is generally under increased pressure.
  • the relaxed portion of the gaseous nitrogen fraction is compressed to a pressure which is essentially equal to the pressure when the gaseous nitrogen fraction is divided, and also not subsequently thereafter relaxed part of the gaseous nitrogen fraction is supplied.
  • the entire gaseous nitrogen fraction is also available under the (generally increased) pressure of the medium pressure stage in the type of cold generation according to the invention and can be used, for example, in the combustion chamber of a coal gasification power plant.
  • the product purities achieved are often unsatisfactory, particularly in those applications in which the entire air separation and in particular the medium pressure stage must be carried out at relatively high pressures. This applies to the nitrogen produced, but particularly to the oxygen product.
  • a further nitrogen fraction is removed from the head of the medium pressure stage, heated, compressed, then cooled again and introduced into the pressure stage.
  • the (pure) nitrogen fraction is therefore at least partially carried out in a so-called amplification circuit.
  • the amount of nitrogen passed through the boost circuit into the pressure stage is condensed in indirect heat exchange with sump liquid from the medium pressure stage, drawn off in liquid form and passed on to the medium pressure stage as an additional return flow.
  • the invention also relates to a device for carrying out the method according to patent claims 6 and 7.
  • Compressed and pre-cleaned air is introduced via line 1, cooled in a main heat exchanger 17 in indirect heat exchange with product streams and fed into pressure stage 3 of a two-stage rectification column 2.
  • the pressure level 3 (operating pressure: 6 to 20 bar, preferably 8 to 17 bar) is with the medium pressure level 4 (operating pressure: 1.5 to 10 bar, preferably 2.0 to 8.0 bar) via a common condenser / evaporator 13 in heat exchanging connection.
  • the introduced air is pre-divided in pressure stage 3 into nitrogen and into an oxygen-enriched fraction.
  • the oxygen-enriched fraction is discharged in the liquid state via line 6, subcooled in heat exchanger 18 and throttled into the medium pressure stage 4.
  • Nitrogen from the head of pressure stage 3 is also drawn off in liquid form via line 5, subcooled in heat exchanger 18 and partly discharged as a liquid product via line 8.
  • the other part of the nitrogen from the pressure stage 3 is fed via line 9 as a return to the medium pressure stage 4.
  • Another liquid fraction is discharged via line 7 from pressure stage 3 and fed to low pressure stage 4.
  • liquid oxygen (line 14), gaseous pure nitrogen (line 15) and impure nitrogen (line 16) are removed and the nitrogen streams in the heat exchanger 18 are additionally heated in the main heat exchanger 17.
  • part (line 21) of the air in line 1 can be condensed in heat exchange 20 with oxygen 14 from the bottom of medium pressure stage 4.
  • the liquid 14 from the sump of the medium pressure stage 4 is brought to high pressure by means of a pump 19 and at which Heat exchange in the condenser 20 partially evaporates.
  • the partially condensed air 22 is introduced into the pressure stage 3 above the first feed point (line 1).
  • the vaporized portion of the oxygen is removed via line 23 and warmed (17). Another part of the oxygen is withdrawn via line 42 as a liquid product stream.
  • part of the impure nitrogen in line 16 is drawn off from the main heat exchanger 17 via line 30 at an average temperature of approximately 110 to 210 K, preferably 135 to 185 K, and in a pressure-reducing turbine 31 to perform a pressure of 2.6 to 1 , 4 bar, preferably about 2.0 bar relaxed.
  • the expanded nitrogen is again conducted via line 32 to the cold end of the main heat exchanger 17 and warmed to approximately ambient temperature. He releases the cold obtained during relaxation to air to be separated in line 1.
  • the pure nitrogen is required under a pressure higher than medium pressure level 4, it can be compressed after it has been heated. This is generally done in several compressor stages 40, 41. As a rule, each is behind Stage 40, 41 the heat of compression removed (not shown in the drawing) water cooler.
  • the additional nitrogen condenses at the top and thereby evaporates liquid in the bottom of the medium pressure stage 4. In liquid form, it is additionally removed via line 5 and fed as a return to the medium pressure column. A correspondingly increased amount of nitrogen is then withdrawn via line 15, warmed (18, 17) and compressed in the compressor stage 40, so that the amplification circuit closes and the balances of the heat exchangers 18 and 17 are balanced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP90103572A 1989-02-23 1990-02-23 Procédé et dispositif de rectification d'air Expired - Lifetime EP0384483B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3905521 1989-02-23
DE19893905521 DE3905521A1 (de) 1989-02-23 1989-02-23 Verfahren und vorrichtung zur luftzerlegung durch rektifikation
EP19890113815 EP0383994A3 (fr) 1989-02-23 1989-07-26 Procédé et dispositif de rectification d'air
EP89113815 1989-07-26

Publications (3)

Publication Number Publication Date
EP0384483A2 true EP0384483A2 (fr) 1990-08-29
EP0384483A3 EP0384483A3 (en) 1990-11-07
EP0384483B1 EP0384483B1 (fr) 1992-07-22

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EP19890113815 Withdrawn EP0383994A3 (fr) 1989-02-23 1989-07-26 Procédé et dispositif de rectification d'air
EP90103572A Expired - Lifetime EP0384483B1 (fr) 1989-02-23 1990-02-23 Procédé et dispositif de rectification d'air

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19890113815 Withdrawn EP0383994A3 (fr) 1989-02-23 1989-07-26 Procédé et dispositif de rectification d'air

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US (1) US5036672A (fr)
EP (2) EP0383994A3 (fr)
JP (1) JPH02245201A (fr)
CN (1) CN1025068C (fr)
AU (1) AU618659B2 (fr)
DE (1) DE59000211D1 (fr)

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EP0562893A1 (fr) † 1992-03-24 1993-09-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et installation de production d'azote sous haute pression et d'oxygène
EP0637725A1 (fr) * 1993-08-06 1995-02-08 Praxair Technology, Inc. Système de rectification cryogénique pour opération à pression plus basse
EP0713069A1 (fr) * 1991-12-18 1996-05-22 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et installation de séparation d'air
EP0834712A2 (fr) * 1996-10-01 1998-04-08 Air Products And Chemicals, Inc. Procédé de production d'azote à haute pression en utilisant une colonne à pression plus élevée et une ou plusieurs colonnes à pression plus haute
EP0932003A2 (fr) * 1998-01-22 1999-07-28 Air Products And Chemicals, Inc. Procédé de séparation d'air sous pression élevée en utilisant la détente d'un gaz perdu pour la compression d'un courant d'alimentation
EP0605262B1 (fr) * 1992-12-30 2000-06-28 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et installation de production d'oxygène gazeux sous pression

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FR2670278B1 (fr) * 1990-12-06 1993-01-22 Air Liquide Procede et installation de distillation d'air en regime variable de production d'oxygene gazeux.
DE4126945A1 (de) * 1991-08-14 1993-02-18 Linde Ag Verfahren zur luftzerlegung durch rektifikation
FR2681416B1 (fr) * 1991-09-13 1993-11-19 Air Liquide Procede de refroidissement d'un gaz dans une installation d'exploitation de gaz de l'air, et installation.
US5197296A (en) * 1992-01-21 1993-03-30 Praxair Technology, Inc. Cryogenic rectification system for producing elevated pressure product
US5245832A (en) * 1992-04-20 1993-09-21 Praxair Technology, Inc. Triple column cryogenic rectification system
US5228297A (en) * 1992-04-22 1993-07-20 Praxair Technology, Inc. Cryogenic rectification system with dual heat pump
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US5275004A (en) * 1992-07-21 1994-01-04 Air Products And Chemicals, Inc. Consolidated heat exchanger air separation process
US5321953A (en) * 1993-05-10 1994-06-21 Praxair Technology, Inc. Cryogenic rectification system with prepurifier feed chiller
US5406786A (en) * 1993-07-16 1995-04-18 Air Products And Chemicals, Inc. Integrated air separation - gas turbine electrical generation process
US5463871A (en) * 1994-10-04 1995-11-07 Praxair Technology, Inc. Side column cryogenic rectification system for producing lower purity oxygen
US5461872A (en) * 1994-11-21 1995-10-31 The Boc Group, Inc. Air separation method and apparatus
DE19529681C2 (de) * 1995-08-11 1997-05-28 Linde Ag Verfahren und Vorrichtung zur Luftzerlegung durch Tieftemperaturrektifikation
FR2739439B1 (fr) * 1995-09-29 1997-11-14 Air Liquide Procede et installation de production d'un gaz sous pression par distillation cryogenique
US5546767A (en) * 1995-09-29 1996-08-20 Praxair Technology, Inc. Cryogenic rectification system for producing dual purity oxygen
US5799508A (en) * 1996-03-21 1998-09-01 Praxair Technology, Inc. Cryogenic air separation system with split kettle liquid
JP3527609B2 (ja) * 1997-03-13 2004-05-17 株式会社神戸製鋼所 空気分離方法および装置
AU7330298A (en) * 1997-05-21 1998-12-11 Kemin Huang An oxygen-rich air conditioner
US5878597A (en) * 1998-04-14 1999-03-09 Praxair Technology, Inc. Cryogenic rectification system with serial liquid air feed
US5901578A (en) * 1998-05-18 1999-05-11 Praxair Technology, Inc. Cryogenic rectification system with integral product boiler
US6666048B1 (en) * 1999-04-05 2003-12-23 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Variable capacity fluid mixture separation apparatus and process
WO2003006890A1 (fr) * 2001-07-13 2003-01-23 Ebara Corporation Appareil de climatisation deshumidifiant
CN100436989C (zh) * 2004-01-29 2008-11-26 宝山钢铁股份有限公司 一种用全低压空分装置制取高纯氧的方法
JP4460975B2 (ja) * 2004-08-20 2010-05-12 三菱重工業株式会社 海水処理方法および海水処理装置
US7421856B2 (en) * 2005-06-17 2008-09-09 Praxair Technology, Inc. Cryogenic air separation with once-through main condenser
CN101548145B (zh) * 2006-11-07 2013-07-10 蒂艾克思股份有限公司 除湿
DE102007031765A1 (de) 2007-07-07 2009-01-08 Linde Ag Verfahren zur Tieftemperaturzerlegung von Luft
DE102007031759A1 (de) 2007-07-07 2009-01-08 Linde Ag Verfahren und Vorrichtung zur Erzeugung von gasförmigem Druckprodukt durch Tieftemperaturzerlegung von Luft
DE102009034979A1 (de) 2009-04-28 2010-11-04 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Erzeugung von gasförmigem Drucksauerstoff
EP2312248A1 (fr) 2009-10-07 2011-04-20 Linde Aktiengesellschaft Procédé et dispositif de production d'oxygène sous pression et de crypton/xénon
CN101886871B (zh) * 2010-08-04 2012-08-08 四川空分设备(集团)有限责任公司 一种空气分离制取压力氧气的方法及装置
DE102010052544A1 (de) 2010-11-25 2012-05-31 Linde Ag Verfahren zur Gewinnung eines gasförmigen Druckprodukts durch Tieftemperaturzerlegung von Luft
DE102010052545A1 (de) 2010-11-25 2012-05-31 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung eines gasförmigen Druckprodukts durch Tieftemperaturzerlegung von Luft
EP2520886A1 (fr) 2011-05-05 2012-11-07 Linde AG Procédé et dispositif de production d'un produit comprimé à oxygène gazeux par décomposition à basse température d'air
EP2551619A1 (fr) * 2011-07-26 2013-01-30 Linde Aktiengesellschaft Procédé et dispositif destinés à l'obtention d'oxygène pressurisé et d'azote pressurisé par la décomposition à basse température de l'air
DE102011112909A1 (de) 2011-09-08 2013-03-14 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung von Stahl
EP2600090B1 (fr) 2011-12-01 2014-07-16 Linde Aktiengesellschaft Procédé et dispositif destinés à la production d'oxygène sous pression par décomposition à basse température de l'air
US20130139547A1 (en) * 2011-12-05 2013-06-06 Henry Edward Howard Air separation method and apparatus
DE102011121314A1 (de) 2011-12-16 2013-06-20 Linde Aktiengesellschaft Verfahren zur Erzeugung eines gasförmigen Sauerstoff-Druckprodukts durch Tieftemperaturzerlegung von Luft
DE102012017488A1 (de) 2012-09-04 2014-03-06 Linde Aktiengesellschaft Verfahren zur Erstellung einer Luftzerlegungsanlage, Luftzerlegungsanlage und zugehöriges Betriebsverfahren
EP2784420A1 (fr) 2013-03-26 2014-10-01 Linde Aktiengesellschaft Procédé de séparation de l'air et installation de séparation de l'air
WO2014154339A2 (fr) 2013-03-26 2014-10-02 Linde Aktiengesellschaft Procédé de séparation d'air et installation de séparation d'air
EP2801777A1 (fr) 2013-05-08 2014-11-12 Linde Aktiengesellschaft Installation de décomposition de l'air dotée d'un entraînement de compresseur principal
DE102013017590A1 (de) 2013-10-22 2014-01-02 Linde Aktiengesellschaft Verfahren zur Gewinnung eines Krypton und Xenon enthaltenden Fluids und hierfür eingerichtete Luftzerlegungsanlage
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EP2963370B1 (fr) 2014-07-05 2018-06-13 Linde Aktiengesellschaft Procede et dispositif cryogeniques de separation d'air
TR201808162T4 (tr) 2014-07-05 2018-07-23 Linde Ag Havanın düşük sıcaklıkta ayrıştırılması vasıtasıyla bir basınçlı gaz ürününün kazanılmasına yönelik yöntem ve cihaz.
PL2963369T3 (pl) 2014-07-05 2018-10-31 Linde Aktiengesellschaft Sposób i urządzenie do niskotemperaturowej separacji powietrza
CN104833174B (zh) * 2015-05-26 2017-08-11 杭州杭氧股份有限公司 一种带压辅助氧塔低能耗生产带压低纯氧和高纯氧产品的装置及方法
CN105066587A (zh) * 2015-09-16 2015-11-18 开封空分集团有限公司 深冷分离及生产低纯度氧、高纯度氧和氮的装置及方法
EP3179186A1 (fr) * 2015-12-07 2017-06-14 Linde Aktiengesellschaft Procede de production d'un produit comprime riche en oxygene, gazeux et liquide dans une installation de decomposition de l'air et installation de decomposition de l'air

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0713069A1 (fr) * 1991-12-18 1996-05-22 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et installation de séparation d'air
EP0562893A1 (fr) † 1992-03-24 1993-09-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et installation de production d'azote sous haute pression et d'oxygène
EP0562893B2 (fr) † 1992-03-24 2000-12-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de production d'azote sous haute pression et d'oxygène
EP0605262B1 (fr) * 1992-12-30 2000-06-28 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et installation de production d'oxygène gazeux sous pression
EP0637725A1 (fr) * 1993-08-06 1995-02-08 Praxair Technology, Inc. Système de rectification cryogénique pour opération à pression plus basse
EP0834712A2 (fr) * 1996-10-01 1998-04-08 Air Products And Chemicals, Inc. Procédé de production d'azote à haute pression en utilisant une colonne à pression plus élevée et une ou plusieurs colonnes à pression plus haute
EP0834712A3 (fr) * 1996-10-01 1998-10-21 Air Products And Chemicals, Inc. Procédé de production d'azote à haute pression en utilisant une colonne à pression plus élevée et une ou plusieurs colonnes à pression plus haute
EP0932003A2 (fr) * 1998-01-22 1999-07-28 Air Products And Chemicals, Inc. Procédé de séparation d'air sous pression élevée en utilisant la détente d'un gaz perdu pour la compression d'un courant d'alimentation

Also Published As

Publication number Publication date
AU4996090A (en) 1990-08-30
EP0383994A2 (fr) 1990-08-29
JPH02245201A (ja) 1990-10-01
CN1045173A (zh) 1990-09-05
CN1025068C (zh) 1994-06-15
EP0383994A3 (fr) 1990-11-07
DE59000211D1 (de) 1992-08-27
EP0384483A3 (en) 1990-11-07
US5036672A (en) 1991-08-06
AU618659B2 (en) 1992-01-02
EP0384483B1 (fr) 1992-07-22

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