EP2176610B1 - Processus de séparation d'air par distillation cryogénique - Google Patents

Processus de séparation d'air par distillation cryogénique Download PDF

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Publication number
EP2176610B1
EP2176610B1 EP07785309.1A EP07785309A EP2176610B1 EP 2176610 B1 EP2176610 B1 EP 2176610B1 EP 07785309 A EP07785309 A EP 07785309A EP 2176610 B1 EP2176610 B1 EP 2176610B1
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EP
European Patent Office
Prior art keywords
air
sent
mode
compressor
heat exchange
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.)
Not-in-force
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EP07785309.1A
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German (de)
English (en)
Other versions
EP2176610A4 (fr
EP2176610A1 (fr
Inventor
Alain Guillard
Lasad Jaouani
Xavier Pontone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Publication of EP2176610A1 publication Critical patent/EP2176610A1/fr
Publication of EP2176610A4 publication Critical patent/EP2176610A4/fr
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Publication of EP2176610B1 publication Critical patent/EP2176610B1/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
    • F25J3/04151—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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of 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
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—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
    • 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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
    • 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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • 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
    • F25J2215/40—Air or oxygen enriched air, i.e. generally less than 30mol% of 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air

Definitions

  • the present invention relates to a process for the separation of air by cryogenic distillation.
  • the present invention allows the apparatus to function with optimal power consumption during both modes of operation.
  • the air separation unit includes an air separation column system which may be of any known type, but may particularly be a double column system including a high pressure column and a low pressure column, thermally coupled via a reboiler condenser at the bottom of the low pressure column wherein nitrogen from the top of the high pressure column is condensed.
  • an air separation column system which may be of any known type, but may particularly be a double column system including a high pressure column and a low pressure column, thermally coupled via a reboiler condenser at the bottom of the low pressure column wherein nitrogen from the top of the high pressure column is condensed.
  • US 2006/010912 A1 describes an air separation process in which in all modes of operation, compressed and purified gaseous air is cooled in a heat exchange line and sent to at least one column of a column system, a liquid stream enriched in a component of air is removed from a column of the column system and vaporised in the heat exchange line, air at an elevated pressure is sent to the heat exchange line, condensed and sent to the column system.
  • Part of the feed air can be sent to one of at least two expanders and thence to a column of the column system.
  • a first mode, called peak period no air is sent to a second compressor but air is sent to a cold compressor and then liquefied. No refrigeration is produced using the air expanders.
  • a second mode called off-peak period
  • only a part of the air is sent to the second compressor to be compressed to a pressure higher than the highest column pressure of the column system and no air is sent to the cold compressor, whilst refrigeration is produced using two air expanders.
  • the process can produce more liquid as final product than during the first mode. It is not clear how the production of liquid for consumption outside the air separation unit varies during the two modes and the second compressor outlet pressure is not given.
  • Figures 1 , 2 and 3 show air flow diagrams for an air separation unit according to the invention.
  • the dashed lines indicate couplings between a compressor and a turbine.
  • FIG. 1 uses a double column system in which a high pressure column 65 is placed underneath a low pressure column 67 and thermally coupled thereto via a reboiler condenser 69.
  • cooled, purified and compressed gaseous air is fed to the high pressure column 65.
  • Reflux streams (not shown) are sent from the high pressure column to the low pressure column 67 as is well known in the art.
  • gaseous nitrogen 61 is removed from the top of the low pressure column 67 and warmed in exchanger 19 whilst waste nitrogen 59 is removed from lower down the low pressure column 67 and warmed in exchanger 19 before being used to regenerate the purification unit 8.
  • liquid oxygen is removed from the bottom of the low pressure column 57 and pressurised as stream 55 in pump 57 before being vaporised in the heat exchanger 19 to form product high pressure gaseous oxygen (HP GOX).
  • liquid oxygen LOX 53 and liquid nitrogen LIN 71 are removed from the low pressure.
  • liquid oxygen is removed from the bottom of the low pressure column 67 and pressurised as stream 55 in pump 57 before being vaporised in the heat exchanger 19 to form product high pressure gaseous oxygen (HP GOX).
  • the cooling section 43 receives air at 47 bars which is then cooled by passing through the whole heat exchange line during the liquid mode and receives air at 26 bars coming from the cold compressor 37 during the gas mode.
  • section 23 sees a reversal of flow between the two modes, air flowing in one direction from the heat exchange line 19 to the turbine 29 in liquid mode and in the other direction from the cold compressor 37 to the heat exchange line 19 in gas mode.
  • the nitrogen 61 is compressed to a higher pressure in compressor 63.
  • liquid oxygen is removed from the bottom of the low pressure column 57 and pressurised as stream 55 in pump 57 before being vaporised in the heat exchanger 19 to form product high pressure gaseous oxygen (HP GOX).
  • liquid oxygen LOX 53 and liquid nitrogen LIN 71 are removed from the low pressure.
  • liquid oxygen is removed from the bottom of the low pressure column 67 and pressurised as stream 55 in pump 57 before being vaporised in the heat exchanger 19 to form product high pressure gaseous oxygen (HP GOX).
  • the cooling section 43 receives air which is then cooled by passing through the whole heat exchange line during the liquid mode and receives air at 26 bars coming from the cold compressor 37 during the gas mode.
  • section 23 sees a reversal of flow between the two modes, air flowing in one direction from the heat exchange line 19 to the turbine 29 in liquid mode and in the other direction from the cold compressor 37 to the heat exchange line 19 in gas mode.
  • the nitrogen 61 is compressed to a higher pressure in compressor 63.
  • FIG. 3 may use a double column system as shown and described for Figure 1 , in which a high pressure column 65 is placed underneath a low pressure column 67 and thermally coupled thereto via a reboiler condenser 69.
  • liquid oxygen is removed from the bottom of the low pressure column 57 and pressurised as stream 55 in pump 57 before being vaporised in the heat exchanger 19 to form product high pressure gaseous oxygen (HP GOX).
  • the cooling section 43 receives air at 47 bars which is then cooled by passing through the whole heat exchange line during the liquid mode and receives air at 26 bars coming from the cold compressor 37 during the gas mode.
  • section 23 sees a reversal of flow between the two modes, air flowing in one direction from the heat exchange line 19 to the turbine 29 in liquid mode and in the other direction from the cold compressor 37 to the heat exchange line 19 in gas mode.

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  • 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)

Claims (7)

  1. Procédé de production d'au moins un produit liquide (53) et d'au moins un produit gazeux (55, 61) par distillation cryogénique d'air dans un premier mode opératoire et dans un second mode opératoire, le procédé produisant plus de liquide comme produit final au cours du second mode qu'au cours du premier mode, dans lequel, dans tous les modes opératoires, de l'air gazeux comprimé et purifié est refroidi dans une ligne d'échange thermique (19) et envoyé à au moins une colonne d'un système colonnaire (65, 67), un courant de liquide (55) enrichi en un composant de l'air est retiré d'une colonne du système colonnaire et vaporisé dans la ligne d'échange thermique, de l'air (3) sous pression élevée est envoyé à la ligne d'échange thermique, condensé et envoyé au système colonnaire et une partie de l'air comprimé et purifié est envoyée à l'un d'au moins deux dispositifs expanseurs (29, 39) et, de là, à une colonne du système colonnaire, dans lequel :
    a) selon le premier mode, au moins une partie (7) de l'air comprimé et purifié est retirée d'un point intermédiaire de la ligne d'échange thermique, comprimée à une température cryogénique dans un compresseur froid (37) et envoyée à la ligne d'échange thermique pour être encore refroidie et envoyée au système colonnaire et une partie de l'air d'alimentation est envoyée au premier dispositif expanseur (39), aucun air n'étant envoyé à un second compresseur (11, 12, 17) et
    b) selon le second mode, la totalité de l'air comprimé et purifié (5) est comprimée à une pression élevée d'au moins 20 bars supérieure à la pression colonnaire la plus élevée du système colonnaire dans le second compresseur (11, 12, 17), refroidie dans la ligne d'échange thermique et envoyée en partie à un système colonnaire, une autre partie de l'air sous pression élevée étant envoyée au second dispositif expanseur (29), aucun air n'étant envoyé au compresseur froid.
  2. Procédé selon la revendication 1, dans lequel, selon le premier mode, une partie de l'air à la pression de sortie du compresseur froid est refroidie et envoyée au premier dispositif expanseur (39).
  3. Procédé selon la revendication 1 ou 2, dans lequel le compresseur froid (37) est couplé au premier dispositif expanseur (39).
  4. Procédé selon la revendication 1, 2 ou 3, dans lequel le second compresseur (11, 12, 17) est couplé au second expanseur (29).
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'air traité dans le second compresseur (11, 12, 17) dans le second mode et dans le compresseur froid (37) dans le premier mode est ensuite envoyé à un moyen de transfert commun (23) en amont du système colonnaire.
  6. Procédé selon la revendication 5, dans lequel, dans le premier mode, l'air est envoyé du compresseur froid (37) à la ligne d'échange thermique (19) via un conduit (23) et, dans le second mode, l'air est envoyé du second compresseur (11, 12, 17) au second dispositif expanseur (29) via le même conduit.
  7. Procédé selon la revendication 5, dans lequel, dans le premier mode, l'air est envoyé du compresseur froid (37) via un passage de la ligne d'échange thermique (19) à son extrémité froide et, dans le second mode, l'air est envoyé du second compresseur (11, 12, 17) à l'extrémité froide de la ligne d'échange thermique via le même passage.
EP07785309.1A 2007-08-10 2007-08-10 Processus de séparation d'air par distillation cryogénique Not-in-force EP2176610B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/002404 WO2009021350A1 (fr) 2007-08-10 2007-08-10 Processus et appareil de séparation d'air par distillation cryogénique

Publications (3)

Publication Number Publication Date
EP2176610A1 EP2176610A1 (fr) 2010-04-21
EP2176610A4 EP2176610A4 (fr) 2018-03-21
EP2176610B1 true EP2176610B1 (fr) 2019-04-24

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EP07785309.1A Not-in-force EP2176610B1 (fr) 2007-08-10 2007-08-10 Processus de séparation d'air par distillation cryogénique

Country Status (7)

Country Link
US (1) US20110197630A1 (fr)
EP (1) EP2176610B1 (fr)
JP (1) JP4908634B2 (fr)
CN (1) CN101779092A (fr)
BR (1) BRPI0721931A2 (fr)
CA (1) CA2695817A1 (fr)
WO (1) WO2009021350A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2948184B1 (fr) 2009-07-20 2016-04-15 Air Liquide Procede et appareil de separation d'air par distillation cryogenique
FR2973487B1 (fr) * 2011-03-31 2018-01-26 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede et appareil de production d'un gaz de l'air sous pression par distillation cryogenique
FR2973486B1 (fr) * 2011-03-31 2013-05-03 Air Liquide Procede de separation d'air par distillation cryogenique
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US20110197630A1 (en) 2011-08-18
BRPI0721931A2 (pt) 2014-03-18
EP2176610A4 (fr) 2018-03-21
JP2010536003A (ja) 2010-11-25
JP4908634B2 (ja) 2012-04-04
WO2009021350A1 (fr) 2009-02-19
CA2695817A1 (fr) 2009-02-19
CN101779092A (zh) 2010-07-14
EP2176610A1 (fr) 2010-04-21

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