WO2009021350A1 - Processus et appareil de séparation d'air par distillation cryogénique - Google Patents

Processus et appareil de séparation d'air par distillation cryogénique Download PDF

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Publication number
WO2009021350A1
WO2009021350A1 PCT/CN2007/002404 CN2007002404W WO2009021350A1 WO 2009021350 A1 WO2009021350 A1 WO 2009021350A1 CN 2007002404 W CN2007002404 W CN 2007002404W WO 2009021350 A1 WO2009021350 A1 WO 2009021350A1
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WO
WIPO (PCT)
Prior art keywords
air
compressor
sent
heat exchange
mode
Prior art date
Application number
PCT/CN2007/002404
Other languages
English (en)
Inventor
Alain Guillard
Lasad Jaouani
Xavier Pontone
Original Assignee
L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude filed Critical L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude
Priority to CN200780100211A priority Critical patent/CN101779092A/zh
Priority to EP07785309.1A priority patent/EP2176610B1/fr
Priority to BRPI0721931-8A priority patent/BRPI0721931A2/pt
Priority to JP2010519320A priority patent/JP4908634B2/ja
Priority to US12/671,927 priority patent/US20110197630A1/en
Priority to CA2695817A priority patent/CA2695817A1/fr
Priority to PCT/CN2007/002404 priority patent/WO2009021350A1/fr
Publication of WO2009021350A1 publication Critical patent/WO2009021350A1/fr

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Classifications

    • 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 and apparatus for the separation of air by cryogenic distillation. It is frequently desirable to have an air separation unit which produces at least mainly gas during at least one period when electricity costs are higher and at least mainly liquid during at least one period when electricity costs are lower.
  • the present invention allows the apparatus to function with optimal power consumption during both modes of operation.
  • the apparatus 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. All pressures mentioned in this text are absolute pressures.
  • a process for the production of at least one liquid product and at least one gaseous product by cryogenic distillation of air under a first mode of operation and a second mode of operation the process producing more liquid as final product during the second mode than during the first mode
  • 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 and part of the feed air is sent to one of at least two expanders and thence to a column of the column system
  • at least part of the feed air is removed from an intermediate point of the heat exchange line, compressed at a cryogenic temperature in a cold compressor and sent to the heat exchange line to be further cooled and sent to the column system and part of the feed air
  • part of the feed air at the outlet pressure of the cold compressor is cooled and sent to the first expander
  • the cold compressor is coupled to the first expander
  • the second compressor is coupled to the second expander
  • an apparatus for the separation of air by cryogenic distillation comprising: a) a column system b) a heat exchange line c) a main compressor d) a cold compressor connected to the outlet of the main compressor e) a second compressor connected to the outlet of the main compressor f) first and second expanders g) means for sending air from the cold compressor to the first expander h) means for sending air from the second compressor to the second expander i) means for sending air from the first and second expanders to the column system j) means for sending air from the cold compressor and the second compressor to the column system via the heat exchange means without traversing either of the first and second expanders.
  • the means for sending air from the cold compressor to the first expander and means for sending air from the second compressor to the second expander include a common section of conduit;
  • the means for sending air from the cold compressor and the second compressor to the column system via the heat exchange means without traversing either of the first and second expanders includes at least one common passage in the heat exchange means;
  • the apparatus includes a third expander and means for sending air from the column system to the third expander and thence to the heat exchange means.
  • 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.
  • One part is cooled completely in the heat exchange line 19 as stream 41 , whilst the rest 33 is sent via valve 35 to turbine 39 coupled to cold compressor 37.
  • the expanded air is then sent to a column of the column system.
  • the air is sent as stream 45 to the high pressure column 65, forming the sole gaseous feed to the high pressure column.
  • 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 69 are removed from the low pressure and high pressure columns respectively.
  • 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 28 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. It will be appreciated that a small amount of liquid may be produced during the gas mode and that gas is produced during the liquid 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).
  • HP GOX product high pressure gaseous oxygen
  • all the air from compressor 1 is sent to compressors 11 ,17 as stream 5 and is compressed to 34 bars, valve 15 being open and valve 13 being closed.
  • the high pressure air 5 is then sent to the warm end of the heat exchange line 19. Once the stream 5 is partially cooled, it is divided in two, one part 41 being cooled completely in the heat exchange line 19 via conduit 43 and the rest 31 being sent to turbine 29 via conduit 23 and valve 21.
  • the expanded air stream 45 is sent to a column of the column system, in this case the high pressure column 65..
  • Compressor 17 is coupled to expander 29.
  • liquid oxygen LOX 53 and liquid nitrogen LIN 69 are removed from the low pressure and high pressure columns respectively.
  • 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).
  • HP GOX product high pressure gaseous oxygen
  • 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.
  • 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.
  • the air is sent as stream 45 to the high pressure column 65, forming the sole gaseous feed to the high pressure column.
  • 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)

Abstract

La présente invention concerne un processus de production d'au moins un produit liquide (53, 71) et d'au moins un produit gazeux (55, 61) par distillation cryogénique. Selon le premier mode, au moins une partie de l'air d'alimentation est retirée d'un point intermédiaire de la conduite d'échange de chaleur (19), comprimée à une température cryogénique dans un compresseur frigorifique (37) et envoyée à la conduite d'échange de chaleur (19) pour continuer d'être refroidie puis envoyée au système de colonne (65, 67), et une partie de l'air d'alimentation est envoyée à un premier détendeur (39). Selon le second mode, l'ensemble de l'air d'alimentation est comprimé à une haute pression supérieure d'au moins 20 barres à la pression de colonne la plus élevée du système de colonne (65, 67) dans un second compresseur (11, 17), refroidi dans la conduite d'échange de chaleur (19) et envoyé en partie à un système de colonne (65, 67), une autre partie de l'air haute pression étant envoyée au second détendeur (29).
PCT/CN2007/002404 2007-08-10 2007-08-10 Processus et appareil de séparation d'air par distillation cryogénique WO2009021350A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN200780100211A CN101779092A (zh) 2007-08-10 2007-08-10 用于通过低温蒸馏分离空气的方法和设备
EP07785309.1A EP2176610B1 (fr) 2007-08-10 2007-08-10 Processus de séparation d'air par distillation cryogénique
BRPI0721931-8A BRPI0721931A2 (pt) 2007-08-10 2007-08-10 Processo de aparelho para a separação de ar por destilação criogênica
JP2010519320A JP4908634B2 (ja) 2007-08-10 2007-08-10 極低温蒸留によって空気を分離する方法及び装置
US12/671,927 US20110197630A1 (en) 2007-08-10 2007-08-10 Process and Apparatus for the Separation of Air by Cryogenic Distillation
CA2695817A CA2695817A1 (fr) 2007-08-10 2007-08-10 Processus et appareil de separation d'air par distillation cryogenique
PCT/CN2007/002404 WO2009021350A1 (fr) 2007-08-10 2007-08-10 Processus et appareil de séparation d'air par distillation cryogénique

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 (1)

Publication Number Publication Date
WO2009021350A1 true WO2009021350A1 (fr) 2009-02-19

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PCT/CN2007/002404 WO2009021350A1 (fr) 2007-08-10 2007-08-10 Processus et appareil 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2948184A1 (fr) * 2009-07-20 2011-01-21 Air Liquide Procede et appareil de separation d'air par distillation cryogenique
FR2973486A1 (fr) * 2011-03-31 2012-10-05 Air Liquide Procede de separation d'air par distillation cryogenique
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EP2176610A4 (fr) 2018-03-21
CN101779092A (zh) 2010-07-14
EP2176610A1 (fr) 2010-04-21
US20110197630A1 (en) 2011-08-18
BRPI0721931A2 (pt) 2014-03-18
JP4908634B2 (ja) 2012-04-04
EP2176610B1 (fr) 2019-04-24
CA2695817A1 (fr) 2009-02-19

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