FR2953915A1 - METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION - Google Patents

METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION Download PDF

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Publication number
FR2953915A1
FR2953915A1 FR0958880A FR0958880A FR2953915A1 FR 2953915 A1 FR2953915 A1 FR 2953915A1 FR 0958880 A FR0958880 A FR 0958880A FR 0958880 A FR0958880 A FR 0958880A FR 2953915 A1 FR2953915 A1 FR 2953915A1
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France
Prior art keywords
pressure column
low pressure
enclosure
chamber
oxygen
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Granted
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FR0958880A
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French (fr)
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FR2953915B1 (en
Inventor
Benoit Davidian
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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Priority to FR0958880A priority Critical patent/FR2953915B1/en
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to CN201080055693.4A priority patent/CN102652247B/en
Priority to AU2010329766A priority patent/AU2010329766B2/en
Priority to EP10776785.7A priority patent/EP2510294B1/en
Priority to CA2782958A priority patent/CA2782958A1/en
Priority to ES10776785.7T priority patent/ES2486260T3/en
Priority to PCT/FR2010/052099 priority patent/WO2011070257A1/en
Priority to JP2012542592A priority patent/JP5694363B2/en
Priority to US13/515,059 priority patent/US20120285197A1/en
Publication of FR2953915A1 publication Critical patent/FR2953915A1/en
Application granted granted Critical
Publication of FR2953915B1 publication Critical patent/FR2953915B1/en
Priority to ZA2012/03625A priority patent/ZA201203625B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F25J3/04436—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 at least a triple pressure main column system
    • F25J3/04454—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 at least a triple pressure main column system a main column system not otherwise provided, e.g. serially coupling of columns or more than three pressure levels
    • 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
    • F25J3/04066—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 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
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04181—Regenerating the adsorbents
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/04—Mixing or blending of fluids with the feed 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
    • 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
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
    • F25J2240/46—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval the fluid being oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/50—Processes or apparatus involving steps for recycling of process streams the recycled stream being oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle heat exchanger
    • 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
    • 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
    • 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
    • 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

Abstract

Un appareil de séparation d'air comprend une colonne moyenne pression (39), une colonne basse pression (41), une enceinte (141), un échangeur (13), un condenseur de cuve (25) de la colonne basse pression et un condenseur (15)placé dans l'enceinte, une conduite pour envoyer de l'air comprimé, épuré et refroidi de l'échangeur à la colonne moyenne pression, une conduite pour envoyer un gaz calorigène au condenseur placé dans l'enceinte, une conduite pour envoyer un gaz enrichi en azote de la colonne moyenne pression au condenseur de la colonne basse pression, une conduite pour envoyer un débit enrichi en oxygène de la cuve de la colonne moyenne pression à la colonne basse pression, une conduite pour envoyer du liquide riche en oxygène de la cuve de la colonne basse pression à l'enceinte, une conduite pour soutirer de l'enceinte un fluide plus riche en oxygène que celui envoyé à l'enceinte, une conduite pour renvoyer un gaz de l'enceinte à la colonne basse pression, une conduite pour soutirer un gaz en tête de la colonne basse pression caractérisé en ce qu'il comprend un moyen de détente (51) pour détendre le liquide riche en oxygène en aval de la cuve de la colonne basse pression et en amont de l'enceinte et un compresseur (21) pour comprimer le gaz de l'enceinte en aval de l'enceinte et en amont de la colonne basse pression.An air separation apparatus comprises a medium pressure column (39), a low pressure column (41), an enclosure (141), an exchanger (13), a bottom condenser (25) of the low pressure column and a condenser (15) placed in the chamber, a pipe for sending compressed, purified and cooled air from the exchanger to the medium-pressure column, a pipe for sending a heat-transfer gas to the condenser placed in the chamber, a pipe for supplying a nitrogen-enriched gas from the medium pressure column to the condenser of the low pressure column, a conduit for sending an oxygen enriched flow from the medium pressure column vessel to the low pressure column, a conduit for sending rich liquid in oxygen from the tank of the low pressure column to the chamber, a pipe for withdrawing from the chamber a fluid richer in oxygen than that sent to the chamber, a pipe for returning a gas from the chamber to the column low pressure, a conduit for withdrawing a gas at the top of the low pressure column characterized in that it comprises an expansion means (51) for relaxing the oxygen-rich liquid downstream of the low pressure column vessel and upstream of the enclosure and a compressor (21) for compressing the gas of the enclosure downstream of the enclosure and upstream of the low pressure column.

Description

La présente invention est relative à un procédé et à un appareil de séparation d'air par distillation cryogénique. The present invention relates to a method and apparatus for air separation by cryogenic distillation.

Il est connu de séparer l'air dans un appareil comprenant une colonne moyenne pression et deux colonnes basse pression opérant à la même pression, une des colonnes basse pression étant alimentée en tête par le liquide de cuve de l'autre et chaque colonne basse pression ayant un condenseur de cuve. It is known to separate the air in an apparatus comprising a medium pressure column and two low pressure columns operating at the same pressure, one of the low pressure columns being fed at the top by the vessel liquid of the other and each low pressure column. having a tank condenser.

Un but de l'invention est de réduire l'énergie de séparation pour produire de l'oxygène impur, en particulier dans le cas où il n'y a pas de co-production io d'azote. An object of the invention is to reduce the separation energy to produce impure oxygen, particularly in the case where there is no co-production of nitrogen.

Un autre but de l'invention est de réduire le coût d'au moins certains éléments de l'appareil. Another object of the invention is to reduce the cost of at least some elements of the apparatus.

Tous les pourcentages relatifs à des puretés sont des pourcentages molaires. All percentages for purities are molar percentages.

15 L'invention implique l'utilisation d'un compresseur froid pour comprimer un gaz riche en oxygène, provenant d'une enceinte opérant à une pression en dessous de celle de la colonne basse pression, le gaz étant destiné à la cuve d'une colonne basse pression. Ceci permet de découpler la pression en cuve de colonne moyenne pression avec le haut de la colonne basse pression. The invention involves the use of a cold compressor to compress an oxygen-rich gas from an enclosure operating at a pressure below that of the low pressure column, the gas being directed to the vessel of a low pressure column. This makes it possible to decouple the medium pressure column vessel pressure with the top of the low pressure column.

20 L'invention est particulièrement intéressante pour le cas où de l'air se condense partiellement dans le condenseur de l'enceinte opérant à plus basse pression que la colonne basse pression. The invention is of particular interest in the case where air partially condenses in the condenser of the lower pressure vessel than the low pressure column.

Selon un objet de l'invention, il est prévu un procédé de séparation d'air par distillation cryogénique dans lequel : According to one object of the invention, there is provided a method of air separation by cryogenic distillation in which:

25 i) un débit d'air comprimé et épuré est refroidi dans un échangeur et envoyé à une colonne opérant à une moyenne pression I) a flow of compressed and purified air is cooled in an exchanger and sent to a column operating at medium pressure

ii) le débit d'air se sépare en un débit enrichi en azote et un débit enrichi en oxygène ii) the airflow separates into a nitrogen enriched flow and an oxygen enriched flow rate

iii) une partie du débit enrichi en azote est envoyé à une colonne basse 30 pression iii) a portion of the nitrogen-enriched flow is fed to a low pressure column

iv)au moins une partie du débit enrichi en oxygène est envoyée à la colonne basse pression v) un débit riche en azote est soutiré de la tête de la colonne basse pression iv) at least a portion of the oxygen-enriched flow is sent to the low-pressure column; v) a nitrogen-rich flow is withdrawn from the head of the low-pressure column;

vi) un débit riche en oxygène est soutiré de la cuve de la première colonne basse pression et envoyé à une enceinte contenant au moins un condenseur-vaporiseur vi) a flow rich in oxygen is withdrawn from the tank of the first low pressure column and sent to an enclosure containing at least one condenser-vaporizer

vii) un débit gazeux provenant de l'enceinte en est soutiré renvoyé à la première colonne basse pression, de préférence en cuve vii) a gas flow from the chamber is withdrawn returned to the first low pressure column, preferably in the tank

viii) une partie du débit enrichi en azote de l'étape ii) se condense au moins partiellement dans un condenseur de cuve de la colonne basse pression viii) part of the nitrogen enriched flow of step ii) is condensed at least partially in a bottom condenser of the low pressure column

io et est envoyé à la colonne moyenne pression et/ou la colonne basse pression and is sent to the medium pressure column and / or the low pressure column

ix) un débit de gaz calorigène, éventuellement au moins une partie de l'air comprimé, épuré et refroidi dans l'échangeur de l'étape i), se condense au moins partiellement dans le condenseur vaporiseur de l'enceinte ix) a flow of caloric gas, possibly at least a portion of the compressed air, purified and cooled in the exchanger of step i), is condensed at least partially in the vaporizer condenser of the enclosure

x) on soutire un fluide plus riche en oxygène de l'enceinte que le débit 15 soutiré en cuve de la colonne basse pression x) a fluid richer in oxygen from the chamber is withdrawn than the flow 15 withdrawn from the bottom of the low pressure column

caractérisé en ce que l'on détend le débit riche en oxygène soutiré de la cuve de la colonne basse pression en amont de l'enceinte et on pressurise le débit gazeux de l'enceinte en amont de la première colonne basse pression. characterized in that the oxygen-rich flow rate withdrawn from the low pressure column tank is expanded upstream of the chamber and the gaseous flow rate of the chamber upstream of the first low pressure column is pressurized.

De préférence : Preferably:

20 - on comprime le débit gazeux provenant de l'enceinte dans un compresseur ayant une température d'entrée inférieure à -50°C, de préférence aucun étape de chauffage a lieu entre l'enceinte et le compresseur ; The gas flow rate coming from the chamber is compressed in a compressor having an inlet temperature lower than -50 ° C., preferably no heating step takes place between the chamber and the compressor;

- on détend le débit riche en oxygène soutiré de la colonne basse pression à une pression au plus 1 bar en dessous de la pression en cuve de la the oxygen-rich flow rate withdrawn from the low-pressure column is depressurized at a pressure at most 1 bar below the tank pressure of the

25 colonne basse pression, de préférence au plus 0,5 bar, voire au plus 0,2 bar en dessous de cette pression et/ou on comprime le débit gazeux provenant de l'enceinte pour augmenter sa pression d'au plus 1 bar, de préférence au plus 0,5 bar, voire au plus 0,2 bar en amont de la colonne basse pression ; Low pressure column, preferably at most 0.5 bar, or even at most 0.2 bar below this pressure and / or the gas flow rate from the enclosure is compressed to increase its pressure by at most 1 bar, preferably at most 0.5 bar, or even at most 0.2 bar upstream of the low pressure column;

- l'enceinte ne contient pas de moyen d'échange de masse, voire ne - the enclosure does not contain any means of mass exchange, or even

30 contient ni garnissages ni plateaux de distillation ; Contains neither liners nor distillation trays;

- l'enceinte constitue une deuxième colonne basse pression et contient des moyens d'échange de masse, tels que des garnissages ou des plateaux de distillation, placés au moins au-dessus du condenseur. - The enclosure is a second low pressure column and contains mass exchange means, such as packings or distillation trays, placed at least above the condenser.

Selon un autre objet de l'invention, il est prévu un appareil de séparation d'air comprenant une colonne moyenne pression, une colonne basse pression, une enceinte, un échangeur, un condenseur de cuve de la colonne basse pression et un condenseur placé dans l'enceinte, une conduite pour envoyer de l'air comprimé, épuré et refroidi de l'échangeur à la colonne moyenne pression, une conduite pour envoyer un gaz calorigène au condenseur placé dans l'enceinte, une conduite pour envoyer un gaz enrichi en azote de la colonne moyenne pression au condenseur de la colonne basse pression, une conduite pour envoyer un débit enrichi en oxygène de la cuve de la colonne According to another object of the invention, there is provided an air separation apparatus comprising a medium pressure column, a low pressure column, an enclosure, an exchanger, a bottom condenser of the low pressure column and a condenser placed in a the enclosure, a pipe for sending compressed air, purified and cooled from the exchanger to the medium pressure column, a pipe for sending a heat transfer gas to the condenser placed in the enclosure, a pipe for sending a gas enriched in nitrogen from the medium pressure column to the condenser of the low pressure column, a pipe to send an oxygen enriched flow of the column vessel

io moyenne pression à la colonne basse pression, une conduite pour envoyer du liquide riche en oxygène de la cuve de la colonne basse pression à l'enceinte, une conduite pour soutirer de l'enceinte un fluide plus riche en oxygène que celui envoyé à l'enceinte, une conduite pour renvoyer un gaz de l'enceinte à la colonne basse pression, une conduite pour soutirer un gaz en tête de la medium pressure at the low pressure column, a pipe for sending oxygen-rich liquid from the tank of the low pressure column to the enclosure, a pipe for withdrawing a fluid richer in oxygen from the enclosure than that sent to the enclosure, a pipe for returning a gas from the enclosure to the low pressure column, a pipe for drawing a gas at the head of the

15 colonne basse pression caractérisé en ce qu'il comprend un moyen de détente pour détendre le liquide riche en oxygène en aval de la cuve de la colonne basse pression et en amont de l'enceinte et un compresseur pour comprimer le gaz de l'enceinte en aval de l'enceinte et en amont de la colonne basse pression. Low pressure column characterized in that it comprises an expansion means for relaxing the oxygen-rich liquid downstream of the low pressure column and upstream of the chamber and a compressor for compressing the gas of the enclosure downstream of the enclosure and upstream of the low pressure column.

20 Eventuellement : 20 Possibly:

- l'enceinte comprend des moyens d'échange de matière au-dessus du condenseur; the enclosure comprises means for exchanging material above the condenser;

- l'enceinte ne comprend aucun moyen d'échange de matière au-dessus du condenseur; the enclosure does not include any material exchange means above the condenser;

25 - l'appareil comprend une turbine et une conduite pour envoyer un gaz riche en azote de la colonne moyenne pression à la turbine ; The apparatus comprises a turbine and a pipe for supplying a nitrogen rich gas from the medium pressure column to the turbine;

- l'appareil comprend une pompe pour pressuriser un débit d'oxygène liquide provenant de la colonne basse pression et/ou de l'enceinte en amont de l'échangeur. - The apparatus comprises a pump for pressurizing a flow of liquid oxygen from the low pressure column and / or the chamber upstream of the exchanger.

30 L'invention sera décrite en plus de détail en se référant aux figures, qui représentent des appareils selon l'invention. The invention will be described in more detail with reference to the figures, which show apparatus according to the invention.

Dans la Figure 1, l'air 1 est comprimé entre 3 et 5 bars dans un compresseur 3, épuré dans une unité d'épuration 5 et divisé en deux. Une partie 9 se refroidit dans l'échangeur 13 et est envoyée au condenseur de cuve 15 d'une enceinte 141 où elle se condense partiellement avant être envoyé à la colonne moyenne pression 39 d'une double colonne. In Figure 1, the air 1 is compressed between 3 and 5 bar in a compressor 3, purified in a purification unit 5 and divided into two. A part 9 cools in the exchanger 13 and is sent to the tank condenser 15 of a chamber 141 where it partially condenses before being sent to the medium pressure column 39 of a double column.

La double colonne comprend la colonne moyenne pression 39 et une colonne basse pression 41 qui la surmonte, le lien thermique entre les deux colonnes étant assuré par un condenseur 25 dans la cuve de la colonne basse pression 41. The double column comprises the medium pressure column 39 and a low pressure column 41 which overcomes it, the thermal link between the two columns being provided by a condenser 25 in the tank of the low pressure column 41.

L'autre partie de l'air 7 est comprimé dans un compresseur 11, refroidi dans l'échangeur 13 et utilisé pour vaporiser de l'oxygène liquide sous The other part of the air 7 is compressed in a compressor 11, cooled in the exchanger 13 and used to vaporize liquid oxygen under

io pression. Comme l'oxygène est vaporisé à une basse pression la vaporisation a lieu dans un vaporiseur extérieur 27, distinct de l'échangeur 13. L'air liquéfié ainsi formé est envoyé à la colonne moyenne pression 39 après détente dans une vanne 19. L'air liquide peut également être envoyé à la colonne basse pression. pressure. As the oxygen is vaporized at a low pressure, the vaporization takes place in an external vaporizer 27, distinct from the exchanger 13. The liquefied air thus formed is sent to the medium pressure column 39 after expansion in a valve 19. Liquid air can also be sent to the low pressure column.

15 Un liquide enrichi en oxygène 17 est soutiré en cuve de la colonne moyenne pression 39, refroidi dans l'échangeur 43, détendu dans une vanne et envoyé à la colonne basse pression 41. Un liquide 49 ayant substantiellement la composition de l'air est soutiré à un niveau intermédiaire de la colonne moyenne pression 39, refroidi dans l'échangeur 43, détendu dans une vanne et An oxygen enriched liquid 17 is withdrawn in the vat from the medium pressure column 39, cooled in the exchanger 43, expanded in a valve and sent to the low pressure column 41. A liquid 49 having substantially the composition of the air is withdrawn at an intermediate level of the medium pressure column 39, cooled in the exchanger 43, expanded in a valve and

20 envoyé à la colonne basse pression 41. Un liquide enrichi en azote 47 est soutiré en tête de la colonne moyenne pression 39, refroidi dans l'échangeur 43, détendu dans une vanne et envoyé en tête de la colonne basse pression 41. It is sent to the low pressure column 41. A nitrogen-enriched liquid 47 is withdrawn at the top of the medium-pressure column 39, cooled in the exchanger 43, expanded in a valve and sent to the top of the low-pressure column 41.

Un gaz 45 riche en azote est soutiré en tête de la colonne basse A gas 45 rich in nitrogen is withdrawn at the top of the column

25 pression, chauffé dans l'échangeur 43 et ensuite dans l'échangeur 13. Une partie de ce gaz peut être comprimé dans le compresseur 35 pour former le débit 37 qui participe à la régénération de l'unité d'épuration 5. 25, a portion of this gas can be compressed in the compressor 35 to form the flow 37 which participates in the regeneration of the purification unit 5.

Un débit d'azote moyenne pression 33 est soutiré en tête de la colonne moyenne pression 39, chauffé dans l'échangeur 13, détendu dans la turbine 23 A medium pressure nitrogen flow 33 is withdrawn at the top of the medium pressure column 39, heated in the exchanger 13, expanded in the turbine 23

30 et de nouveau chauffé dans l'échangeur 13 avant de servir à la régénération de l'unité d'épuration 5. 30 and again heated in the exchanger 13 before serving to the regeneration of the purification unit 5.

Un débit riche en oxygène 53 contenant entre 45 et 75 % d'oxygène est soutiré de la cuve de la colonne basse pression 41, détendu dans une vanne 51 et envoyé en tête de l'enceinte 141 qui dans cette variante est une colonne de distillation avec un condenseur de cuve 15. Au-dessus du condenseur se trouvent des moyens d'échange de chaleur et de masse 143, par exemple des garnissages, structurés ou pas, ou des plateaux. La vanne 51 ne fait baisser la pression du liquide que de 0.15 .bar environ A flow rich in oxygen 53 containing between 45 and 75% of oxygen is withdrawn from the tank of the low pressure column 41, expanded in a valve 51 and sent to the top of the chamber 141 which in this variant is a distillation column With a tank condenser 15. Above the condenser there are means for heat and mass exchange 143, for example packings, structured or not, or trays. The valve 51 only lowers the liquid pressure by about 0.15 bar.

Le liquide 53 est séparé dans l'enceinte pour former un liquide plus riche en oxygène 29 en cuve. C'est ce liquide 29 qui est envoyé au vaporiseur 27 après pressurisation dans la pompe 63. Un liquide de purge 61 est soutiré du vaporiseur 27. Alternativement un gaz riche en oxygène peut être soutiré de The liquid 53 is separated in the chamber to form a richer oxygen-rich liquid 29 in the tank. It is this liquid 29 which is sent to the vaporizer 27 after pressurization in the pump 63. A purge liquid 61 is withdrawn from the vaporizer 27. Alternatively an oxygen-rich gas can be withdrawn from

io l'enceinte 141. the enclosure 141.

Un gaz de tête 145 est soutiré de l'enceinte, comprimé à la température de soutirage dans un compresseur 21 qui fait augmenter sa pression d'au plus 0.15.bars. Le gaz produit est réinjecté dans la cuve de la colonne basse pression à la pression de sortie du compresseur 21. A top gas 145 is withdrawn from the chamber, compressed at the withdrawal temperature in a compressor 21 which increases its pressure by at most 0.15 bar. The product gas is reinjected into the tank of the low pressure column at the outlet pressure of the compressor 21.

15 Avec un écart de température dans l'échangeur 13 de 2°C au bout chaud, on obtient un gain d'environ 2.5% par rapport au même schéma sans le compresseur froid en cuve de la colonne basse pression With a temperature difference in the exchanger 13 of 2 ° C. at the hot end, a gain of approximately 2.5% is obtained with respect to the same scheme without the cold compressor in the tank of the low pressure column.

L'appareil de la figure 2 diffère de celui de la figure 1 en ce que l'enceinte 141 ne contient pas de garnissages ou de plateaux. Il y a aussi la The apparatus of FIG. 2 differs from that of FIG. 1 in that the enclosure 141 does not contain packings or trays. There is also the

20 condensation partielle ascendante dans le vaporiseur 15. Ainsi la différence de composition entre le liquide 53 envoyé à l'enceinte et le liquide 29 soutiré de l'enceinte est très réduite même si le liquide 29 est tout de même plus riche en oxygène que le liquide 53. Le gaz 145 est le gaz produit par vaporisation partielle du liquide 53 dans l'enceinte 141 par échange de chaleur avec l'air 9. In this way, the difference in composition between the liquid 53 sent to the chamber and the liquid 29 withdrawn from the chamber is very small even if the liquid 29 is still richer in oxygen than the The gas 145 is the gas produced by partial vaporization of the liquid 53 in the chamber 141 by heat exchange with the air 9.

25 Si on serre l'écart de température au bout chaud de l'échangeur 13 à 2°C, on a un gain d'environ 1.5% par rapport au même schéma sans compresseur froid en cuve BP. If the temperature difference is tightened at the hot end of exchanger 13 at 2 ° C., a gain of about 1.5% is obtained with respect to the same scheme without cold compressor in LP tank.

On obtient une énergie très légèrement meilleure celui du procédé de WO-A-2007/129152 avec l'échangeur serré à 2°C au bout chaud. Même si A slightly better energy is obtained than the method of WO-A-2007/129152 with the exchanger tight at 2 ° C hot end. Even if

30 dans les deux procédés, on utilise un compresseur froid, dans la variante de l'invention la puissance du compresseur froid est 10 fois plus petite que dans la variante de l'art antérieur et la turbine azote 2 fois plus petite. On constate aussi que le taux de compression dans la variante selon l'invention est très faible et qu'une technologie proche d'un ventilateur doit suffire pour le compresseur 21 : ces éléments permettent de dire que le compresseur froid 21 et la turbine 23 seront moins coûteux que dans le procédé de l'art antérieur. In both processes, a cold compressor is used, in the variant of the invention the power of the cold compressor is 10 times smaller than in the variant of the prior art and the nitrogen turbine 2 times smaller. It can also be seen that the compression ratio in the variant according to the invention is very low and that a technology close to a fan must suffice for the compressor 21: these elements make it possible to say that the cold compressor 21 and the turbine 23 will be less expensive than in the method of the prior art.

La compression cryogénique d'un fluide relativement riche en oxygène ne doit pas poser de problème de sécurité. Cryogenic compression of a relatively oxygen-rich fluid should not pose a safety problem.

Le concept de compression de la partie vapeur dans la colonne basse pression peut être étendu au cas des schémas avec trois condenseurs dans la colonne basse pression, avec un ou deux compresseurs froid à placer entre les trois condenseurs de la colonne basse pression. io The concept of compression of the vapor part in the low pressure column can be extended to the case of diagrams with three condensers in the low pressure column, with one or two cold compressors to be placed between the three condensers of the low pressure column. io

Claims (10)

REVENDICATIONS1. Procédé de séparation d'air par distillation cryogénique dans lequel : i) un débit d'air comprimé et épuré est refroidi dans un échangeur (13) et envoyé à une colonne (39) opérant à une moyenne pression ii) le débit d'air se sépare en un débit enrichi en azote et un débit enrichi en oxygène iii) une partie du débit enrichi en azote est envoyé à une colonne basse pression (41) io iv) au moins une partie du débit enrichi en oxygène est envoyée à la colonne basse pression v) un débit riche en azote est soutiré de la tête de la colonne basse pression vi) un débit riche en oxygène est soutiré de la cuve de la première 15 colonne basse pression et envoyé à une enceinte (141) contenant au moins un condenseur-vaporiseur (15) vii) un débit gazeux provenant de l'enceinte en est soutiré renvoyé à la colonne basse pression, de préférence en cuve, viii) une partie du débit enrichi en azote de l'étape ii) se condense au 20 moins partiellement dans un condenseur de cuve (25) de la colonne basse pression et est envoyé à la colonne moyenne pression et/ou la colonne basse pression ix) un débit de gaz calorigène, éventuellement au moins une partie de l'air comprimé, épuré et refroidi dans l'échangeur de l'étape i), se condense 25 au moins partiellement dans le condenseur vaporiseur de l'enceinte x) on soutire un fluide plus riche en oxygène de l'enceinte que le débit soutiré en cuve de la colonne basse pression xi) caractérisé en ce que l'on détend le débit riche en oxygène soutiré de la cuve de la colonne basse pression en amont de l'enceinte et on 30 pressurise le débit gazeux de l'enceinte en amont de la première colonne basse pression. REVENDICATIONS1. A method of separating air by cryogenic distillation in which: i) a flow of compressed and purified air is cooled in an exchanger (13) and sent to a column (39) operating at medium pressure; ii) the air flow rate separates into a nitrogen enriched flow and an oxygen enriched flow iii) a portion of the nitrogen enriched flow is fed to a low pressure column (41) iv) at least a portion of the oxygen enriched flow is sent to the column low pressure v) a nitrogen-rich flow is withdrawn from the head of the low-pressure column vi) an oxygen-rich flow is withdrawn from the vessel of the first low-pressure column and sent to an enclosure (141) containing at least one condenser-vaporizer (15) vii) a gas flow from the chamber is withdrawn returned to the low pressure column, preferably in the tank, viii) a portion of the nitrogen-enriched flow of step ii) condenses at 20 less partially in a condensed tank reactor (25) of the low pressure column and is sent to the medium pressure column and / or the low pressure column ix) a flow of caloric gas, possibly at least a portion of the compressed air, purified and cooled in the exchanger of step i), is condensed at least partially in the vaporizer condenser of the chamber x) is withdrawn a fluid richer in oxygen from the chamber than the flow withdrawn into the bottom of the low pressure column xi) characterized in that the oxygen-rich flow rate withdrawn from the bottom of the low-pressure column tank is upstream of the enclosure and the gaseous flow rate of the enclosure upstream of the first low-pressure column is pressurized. 2. Procédé selon la revendication 1 dans lequel on comprime le débit gazeux provenant de l'enceinte dans un compresseur (21) ayant une température d'entrée inférieure à -50°C, de préférence aucun étape de chauffage ayant lieu entre l'enceinte et le compresseur. 2. Method according to claim 1 wherein the gas flow rate from the chamber is compressed in a compressor (21) having an inlet temperature lower than -50 ° C, preferably no heating step taking place between the enclosure and the compressor. 3. Procédé selon la revendication 1 ou 2 dans lequel on détend le débit riche en oxygène soutiré de la colonne basse pression (41) à une pression au plus 1 bar en dessous de la pression en cuve de la colonne basse pression, de préférence au plus 0,5 bar, voire au plus 0,2 bar en dessous de cette io pression et/ou on comprime le débit gazeux provenant de l'enceinte (141) pour augmenter sa pression d'au plus 1 bar, de préférence au plus 0,5 bar, voire au plus 0,2 bar en amont de la colonne basse pression. 3. Method according to claim 1 or 2 wherein the oxygen-rich flow rate withdrawn from the low-pressure column (41) is expanded to a pressure at most 1 bar below the tank pressure of the low-pressure column, preferably at plus 0.5 bar, or at most 0.2 bar below this pressure and / or compressing the gas flow from the enclosure (141) to increase its pressure by at most 1 bar, preferably at most 0.5 bar, or at most 0.2 bar upstream of the low pressure column. 4. Procédé selon l'une des revendications précédentes dans lequel 15 l'enceinte (141) ne contient pas de moyen d'échange de masse, voire ne contient ni garnissages ni plateaux de distillation. 4. Method according to one of the preceding claims wherein the chamber (141) does not contain mass exchange means, or contains neither liners nor distillation trays. 5. Procédé selon l'une des revendications 1 à 3 dans lequel l'enceinte (141) constitue une deuxième colonne basse pression et contient des moyens 20 d'échange de masse (143), tels que des garnissages ou des plateaux de distillation, placés au moins au-dessus du condenseur. 5. Method according to one of claims 1 to 3 wherein the enclosure (141) is a second low pressure column and contains mass exchange means (143), such as packings or distillation trays, placed at least above the condenser. 6. Appareil de séparation d'air comprenant une colonne moyenne pression (39), une colonne basse pression (41), une enceinte (141), un 25 échangeur (13), un condenseur de cuve (25) de la colonne basse pression et un condenseur (15)placé dans l'enceinte, une conduite pour envoyer de l'air comprimé, épuré et refroidi de l'échangeur à la colonne moyenne pression, une conduite pour envoyer un gaz calorigène au condenseur placé dans l'enceinte, une conduite pour envoyer un gaz enrichi en azote de la colonne moyenne 30 pression au condenseur de la colonne basse pression, une conduite pour envoyer un débit enrichi en oxygène de la cuve de la colonne moyenne pression à la colonne basse pression, une conduite pour envoyer du liquide riche en oxygène de la cuve de la colonne basse pression à l'enceinte, une 20conduite pour soutirer de l'enceinte un fluide plus riche en oxygène que celui envoyé à l'enceinte, une conduite pour renvoyer un gaz de l'enceinte à la colonne basse pression, une conduite pour soutirer un gaz en tête de la colonne basse pression caractérisé en ce qu'il comprend un moyen de détente (51) pour détendre le liquide riche en oxygène en aval de la cuve de la colonne basse pression et en amont de l'enceinte et un compresseur (21) pour comprimer le gaz de l'enceinte en aval de l'enceinte et en amont de la colonne basse pression. io 6. Air separation apparatus comprising a medium pressure column (39), a low pressure column (41), an enclosure (141), an exchanger (13), a bottom condenser (25) of the low pressure column and a condenser (15) placed in the chamber, a pipe for sending compressed, purified and cooled air from the exchanger to the medium pressure column, a pipe for sending a heat-transfer gas to the condenser placed in the chamber, a conduit for supplying a nitrogen enriched gas from the medium pressure column to the condenser of the low pressure column; a conduit for supplying an oxygen enriched flow from the medium pressure column vessel to the low pressure column; oxygen-rich liquid from the tank of the low pressure column to the chamber, a conduit for withdrawing from the chamber a fluid richer in oxygen than that sent to the enclosure, a pipe for returning a gas from the enclosure at the low column pres a line for withdrawing a gas at the top of the low pressure column, characterized in that it comprises an expansion means (51) for relaxing the oxygen-rich liquid downstream of the low pressure column and upstream of the low pressure column; the enclosure and a compressor (21) for compressing the gas of the enclosure downstream of the enclosure and upstream of the low pressure column. io 7. Appareil selon la revendication 6 dans lequel l'enceinte (141) comprend des moyens d'échange de matière (143) au-dessus du condenseur (15). 7. Apparatus according to claim 6 wherein the enclosure (141) comprises material exchange means (143) above the condenser (15). 8. Appareil selon la revendication 6 dans lequel l'enceinte (141) ne 15 comprend aucun moyen d'échange de matière au-dessus du condenseur (15). Apparatus according to claim 6 wherein the enclosure (141) does not include any material exchange means over the condenser (15). 9. Appareil selon l'une des revendications précédentes 6 à 8 comprenant une turbine (23) et une conduite pour envoyer un gaz riche en azote de la colonne moyenne pression à la turbine. 9. Apparatus according to one of the preceding claims 6 to 8 comprising a turbine (23) and a pipe for sending a nitrogen-rich gas from the medium pressure column to the turbine. 10. Appareil selon l'une des revendications 6 à 9 comprenant une pompe (63) pour pressuriser un débit d'oxygène liquide provenant de la colonne basse pression et/ou de l'enceinte en amont de l'échangeur. 10. Apparatus according to one of claims 6 to 9 comprising a pump (63) for pressurizing a flow of liquid oxygen from the low pressure column and / or the chamber upstream of the exchanger.
FR0958880A 2009-12-11 2009-12-11 METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION Expired - Fee Related FR2953915B1 (en)

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FR0958880A FR2953915B1 (en) 2009-12-11 2009-12-11 METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION
US13/515,059 US20120285197A1 (en) 2009-12-11 2010-10-05 Process and unit for the separation of air by cryogenic distillation
EP10776785.7A EP2510294B1 (en) 2009-12-11 2010-10-05 Process and unit for the separation of air by cryogenic distillation
CA2782958A CA2782958A1 (en) 2009-12-11 2010-10-05 Process and unit for the separation of air by cryogenic distillation
ES10776785.7T ES2486260T3 (en) 2009-12-11 2010-10-05 Procedure and apparatus or equipment for air separation by cryogenic distillation
PCT/FR2010/052099 WO2011070257A1 (en) 2009-12-11 2010-10-05 Process and unit for the separation of air by cryogenic distillation
CN201080055693.4A CN102652247B (en) 2009-12-11 2010-10-05 Process and unit for the separation of air by cryogenic distillation
AU2010329766A AU2010329766B2 (en) 2009-12-11 2010-10-05 Process and unit for the separation of air by cryogenic distillation
JP2012542592A JP5694363B2 (en) 2009-12-11 2010-10-05 Method and unit for separation of air by cryogenic distillation
ZA2012/03625A ZA201203625B (en) 2009-12-11 2012-05-17 Process and unit for the separation of air by cryogenic distillation

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CN102652247B (en) 2014-09-24

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