FR2862746A1 - Assembly for the separation of air by cryogenic distillation, with a system of columns, takes in frozen compressed air at a vaporizer/condenser column with the liquid output used at least partially to chill the air for compression - Google Patents

Assembly for the separation of air by cryogenic distillation, with a system of columns, takes in frozen compressed air at a vaporizer/condenser column with the liquid output used at least partially to chill the air for compression Download PDF

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Publication number
FR2862746A1
FR2862746A1 FR0350903A FR0350903A FR2862746A1 FR 2862746 A1 FR2862746 A1 FR 2862746A1 FR 0350903 A FR0350903 A FR 0350903A FR 0350903 A FR0350903 A FR 0350903A FR 2862746 A1 FR2862746 A1 FR 2862746A1
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Prior art keywords
air
liquid
column
liquids
compressed
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FR0350903A
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French (fr)
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FR2862746B1 (en
Inventor
Philippe Guindon
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04854—Safety aspects of operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
    • 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
    • F25J3/04854—Safety aspects of operation
    • F25J3/0486—Safety aspects of operation of vaporisers for oxygen enriched liquids, e.g. purging of liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/02—Compressor intake arrangement, e.g. filtering or cooling
    • 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
    • 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
    • F25J2250/52—One fluid being oxygen enriched compared to air, e.g. "crude 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/02—Internal refrigeration with liquid vaporising loop
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The assembly for the separation of air by cryogenic distillation, with a system of columns (15,17), compresses the air in a compressor (7). The compressed air is frozen in an exchange line (13) and passed to a vaporizer/condenser column (15). The liquid output (21,22) passes through a heat exchange system (3,11,23) to chill the air supply for compression.

Description

- on utilise au moins une partie des frigories contenues dans le liquideat least some of the frigories contained in the liquid are used

(les liquides) pour refroidir un débit de fluide de refroidissement par échange de chaleur indirect ou direct et d'utiliser le débit de fluide de refroidissement ainsi refroidi pour refroidir de l'air à comprimer ou comprimé ;  (Liquids) for cooling a coolant flow rate by indirect or direct heat exchange and using the cooling fluid flow thus cooled to cool air to be compressed or compressed;

- au moins un liquide dont les frigories servent à refroidir l'air provient d'une cuve d'une colonne du système - au moins un liquide dont les frigories servent à refroidir l'air provient d'un bain d'un vaporiseur-condenseur, étant de préférence un liquide de purge de déconcentration - au moins une partie du liquide de purge de déconcentration échange de la chaleur directement ou indirectement avec l'air destiné au compresseur.  - at least one liquid whose frigories serve to cool the air comes from a tank of a column of the system - at least one liquid whose frigories are used to cool the air comes from a bath of a vaporizer-condenser , preferably being a deconcentration purge liquid - at least a portion of the deconcentration purge liquid exchanges heat directly or indirectly with the air for the compressor.

Selon un autre objet de l'invention, il est prévu une installation de séparation d'air dans un appareil de distillation cryogénique comprenant un système de colonnes, un compresseur, une ligne d'échange, des moyens pour envoyer de l'air comprimé du compresseur à la ligne d'échange, des moyens pour envoyer de l'air refroidi de la ligne d'échange à une colonne du système de colonnes, un vaporiseur-condenseur pour condenser un gaz de l'appareil, des moyens pour soutirer au moins un liquide d'une colonne du système, de préférence un liquide de purge du vaporiseur-condenseur, des moyens pour soutirer un produit gazeux ou liquide de l'appareil caractérisée en ce qu'elle comprend des moyens d'échange de chaleur pour transférer au moins une partie des frigories contenues dans le liquide (les liquides) à de l'air à distiller en amont de la ligne d'échange, ces moyens étant situés en amont de la ligne d'échange.  According to another object of the invention, there is provided an air separation plant in a cryogenic distillation apparatus comprising a column system, a compressor, an exchange line, means for sending compressed air from the compressor at the exchange line, means for sending cooled air from the exchange line to a column of the column system, a vaporizer-condenser for condensing a gas of the apparatus, means for withdrawing at least a liquid of a column of the system, preferably a purge liquid of the vaporizer-condenser, means for withdrawing a gaseous or liquid product from the apparatus characterized in that it comprises heat exchange means for transferring to the least part of the frigories contained in the liquid (the liquids) to the air to be distilled upstream of the exchange line, these means being located upstream of the exchange line.

Selon d'autres aspects facultatifs, l'installation comprend: - des moyens pour envoyer au moins une partie du liquide (des liquides) à des moyens d'échange de la chaleur direct ou indirect avec de l'air destiné à la distillation en amont du compresseur; - un échangeur de chaleur et des moyens pour envoyer au moins une partie du liquide (des liquides) et au moins une partie de l'air comprimé à distiller en amont de la ligne d'échange; - un premier échangeur de chaleur, des moyens pour envoyer au moins une partie du liquide (des liquides) et un débit de fluide de refroidissement au premier échangeur pour refroidir le débit de refroidissement, un deuxième échangeur et des moyens pour envoyer au moins une partie du débit de fluide de refroidissement refroidi et de l'air à comprimer ou comprimé au deuxième échangeur; - des moyens pour envoyer au moins une partie du liquide (des liquides) soutiré(s) au premier échangeur de chaleur pour l'air destiné à la distillation en amont ou aval du compresseur par échange de la chaleur direct ou indirect; - des moyens pour envoyer au moins une partie du purge de déconcentration et au moins une partie de l'air comprimé à distiller à l'échangeur de chaleur en amont de la ligne d'échange; - le fluide de refroidissement est de l'eau.  According to other optional aspects, the installation comprises: means for sending at least a portion of the liquid (liquids) to means for direct or indirect heat exchange with air intended for upstream distillation compressor; - A heat exchanger and means for sending at least a portion of the liquid (liquids) and at least a portion of the compressed air to be distilled upstream of the exchange line; a first heat exchanger, means for sending at least a portion of the liquid (liquids) and a flow rate of cooling fluid to the first exchanger for cooling the cooling flow, a second exchanger and means for sending at least a part the flow rate of cooled cooling fluid and the air to be compressed or compressed at the second exchanger; - Means for sending at least a portion of the liquid (liquid) withdrawn (s) to the first heat exchanger for air for distillation upstream or downstream of the compressor by direct or indirect heat exchange; means for sending at least a portion of the deconcentration purge and at least a portion of the compressed air to be distilled to the heat exchanger upstream of the exchange line; the cooling fluid is water.

L'invention sera décrite en plus de détail en se référant à la figure qui représente schématiquement une installation de séparation d'air selon l'invention.  The invention will be described in more detail with reference to the figure which schematically shows an air separation installation according to the invention.

Un débit d'air destiné à être distillé 1 se trouvant à entre 19 C en hiver et 40 C en été est prérefroidi dans un échangeur de chaleur 3. Le débit refroidi est ensuite filtré par un filtre 5 avant d'être comprimé. Suite à la compression dans le compresseur qui l'amène à une température plus élevée, il est refroidi en utilisant un circuit d'eau 9 dans un échangeur de chaleur 11. S'il s'agit d'un compresseur à plusieurs étages, un circuit de refroidissement sera prévu après chaque étage. Ensuite il est épuré (non-illustré) et se refroidit jusqu'à une température cryogénique dans une ligne d'échange 13. L'air refroidi 1 est envoyé à la colonne moyenne pression 15 d'une double colonne de séparation d'air. La colonne moyenne pression 15 est couplée thermiquement à une colonne basse pression 17 au moyen d'un vaporiseur 19 de manière classique. Les conduites habituelles de remontée de liquides et de produits ne sont pas illustrés dans un souci de simplicité, de même que les moyens de fourniture de frigories.  An air flow intended to be distilled 1 between 19 C in winter and 40 C in summer is pre-cooled in a heat exchanger 3. The cooled flow is then filtered by a filter 5 before being compressed. Following compression in the compressor which brings it to a higher temperature, it is cooled using a water circuit 9 in a heat exchanger 11. If it is a multistage compressor, a Cooling circuit will be provided after each floor. Then it is purified (not shown) and cools to a cryogenic temperature in an exchange line 13. The cooled air 1 is sent to the medium pressure column 15 of a double air separation column. The medium pressure column 15 is thermally coupled to a low pressure column 17 by means of a vaporizer 19 in a conventional manner. The usual lines of rising liquids and products are not illustrated for the sake of simplicity, as well as the means of supply of frigories.

De temps à autre ou en permanence, un débit de purge 21 est soutiré de la cuve de la colonne basse pression pour déconcentrer le bain de liquide où peuvent se concentrer des impuretés.  From time to time or permanently, a purge flow 21 is withdrawn from the bottom of the low pressure column to deconcentrate the liquid bath where impurities can concentrate.

Ce débit de purge de 15 Nm3lh à -186 C est envoyé à un échangeur 23 sans se réchauffer dans la ligne d'échange 13. Dans l'échangeur 23 il refroidit l'eau du circuit de refroidissement 9, débit liquide dont la température varie à l'entrée de 23 de 25 C en hiver à 35 C en été.  This purge flow rate of 15 Nm3lh at -186 C is sent to an exchanger 23 without heating in the exchange line 13. In the exchanger 23 it cools the water of the cooling circuit 9, liquid flow whose temperature varies at the entrance of 23 of 25 C in winter to 35 C in summer.

Réchauffé à -100 C, le débit 21 est envoyé de l'échangeur 23 à l'échangeur 3 où il refroidit l'air en amont du compresseur 7.  Reheated to -100 C, the flow 21 is sent from the exchanger 23 to the exchanger 3 where it cools the air upstream of the compressor 7.

Evidemment le débit de purge peut être envoyé uniquement à l'échangeur 3 ou à l'échangeur 23.  Obviously the purge flow rate can be sent only to the exchanger 3 or the exchanger 23.

Dans cet exemple, le débit de purge vient d'un vaporiseur principal d'un double colonne. II sera aisément compris que l'installation peut comprendre une seule colonne avec condenseur de tête, une triple colonne, un système de colonnes avec colonne argon et éventuellement colonne de déazotation. Le débit de purge peut provenir d'un ou plusieurs vaporiseurs de l'installation, y compris un vaporiseur non-intégré à une colonne.  In this example, the purge flow comes from a main vaporizer of a double column. It will be readily understood that the installation may comprise a single column with head condenser, a triple column, a column system with argon column and possibly denitrogenation column. The purge flow may be from one or more vaporizers in the facility, including a non-integrated column vaporizer.

Alternativement ou additionellement, le liquide envoyé à au moins un des échangeurs 3,23 peut être un autre liquide d'une colonne du système. Il peut s'agir d'une partie d'une production qui est excédentaire. Illustré à la figure est un soutirage de liquide riche 22 prévu pour éviter que le niveau de liquide en cuve de la colonne moyenne pression 15 dépasse un seuil donné. Ce liquide peut être envoyé seul à au moins un des échangeurs ou mélangé avec un autre fluide.  Alternatively or additionally, the liquid sent to at least one of the exchangers 3.23 may be another liquid of a column of the system. It can be a part of a production that is surplus. Illustrated in the figure is a rich liquid withdrawal 22 provided to prevent the liquid level in the tank of the medium pressure column 15 exceeds a given threshold. This liquid can be sent alone to at least one of the exchangers or mixed with another fluid.

Le liquide utilisé pour refroidir l'air en amont de la ligne d'échange peut même provenir d'un autre appareil de séparation d'air ou d'un autre type d'appareil.  The liquid used to cool the air upstream of the exchange line may even come from another air separation apparatus or another type of apparatus.

Claims (9)

REVENDICATIONS 1. Procédé de séparation d'air dans un appareil de distillation cryogénique comprenant un système de colonnes (15,17) comprenant les étapes de: i) comprimer l'air destiné à la distillation dans un compresseur (7) pour produire de l'air comprimé ii) refroidir l'air comprimé dans une ligne d'échange (13) pour produire de l'air comprimé et refroidi iii) envoyer de l'air comprimé et refroidi à une colonne (15) du système de 10 colonnes iv) produire au moins un produit gazeux ou liquide à partir d'une colonne du système v) condenser un gaz de l'appareil dans un vaporiseur-condenseur (19) de l'appareil par échange de chaleur avec un liquide de l'appareil qui se vaporise vi) soutirer au moins un liquide (21, 22) d'une colonne du système de colonnes, de préférence du vaporiseur-condenseur comme purge de déconcentration caractérisé en ce qu'il comprend l'étape d'utiliser au moins une partie des frigories contenues dans l'au moins un liquide soutiré (21, 22) pour refroidir de l'air à distiller en amont de la ligne d'échange.  A method of separating air in a cryogenic distillation apparatus comprising a column system (15, 17) comprising the steps of: i) compressing the air for distillation in a compressor (7) to produce compressed air ii) cooling the compressed air in an exchange line (13) to produce compressed and cooled air iii) supplying compressed and cooled air to a column (15) of the 10 column system iv) producing at least one gaseous or liquid product from a column of the system; v) condensing a gas from the apparatus in a vaporizer-condenser (19) of the apparatus by heat exchange with a liquid of the apparatus which vaporise vi) withdrawing at least one liquid (21, 22) from a column of the column system, preferably the vaporizer-condenser as a deconcentration purge characterized in that it comprises the step of using at least a part of the frigories contained in the at least one liquid withdrawn (21, 22) for cooling dir of air to be distilled upstream of the exchange line. 2. Procédé selon la revendication 1 dans lequel au moins une partie du liquide (des liquides) (21, 22) échange de la chaleur directement ou indirectement avec de l'air destiné au compresseur (7).  2. Method according to claim 1 wherein at least a portion of the liquid (liquids) (21, 22) exchanges heat directly or indirectly with air for the compressor (7). 3. Procédé selon l'une des revendications 1 ou 2 comprenant l'étape d'utiliser au moins une partie des frigories contenues dans le liquide (les liquides) (21, 22) pour refroidir l'air comprimé à distiller en amont de la ligne d'échange par échange de chaleur indirect avec l'air dans un échangeur de chaleur (3, 11).  3. Method according to one of claims 1 or 2 comprising the step of using at least a portion of the frigories contained in the liquid (liquids) (21, 22) for cooling the compressed air to be distilled upstream of the exchange line by indirect heat exchange with air in a heat exchanger (3, 11). 4. Procédé selon l'une des revendications 1, 2 ou 3 comprenant l'étape d'utiliser au moins une partie des frigories contenues dans le liquide (les liquides) (21, 22) pour refroidir un débit de fluide de refroidissement (9) par échange de chaleur indirect ou direct et d'utiliser le débit de fluide de refroidissement ainsi refroidi pour refroidir de l'air à comprimer ou comprimé.  4. Method according to one of claims 1, 2 or 3 comprising the step of using at least a portion of the frigories contained in the liquid (liquids) (21, 22) to cool a flow of cooling fluid (9). ) by indirect or direct heat exchange and use the cooling fluid flow thus cooled to cool air to compress or compressed. 5. Installation de séparation d'air dans un appareil de distillation cryogénique comprenant un système de colonnes (15, 17), un compresseur (7) , une ligne d'échange (13), des moyens pour envoyer de l'air comprimé du compresseur à la ligne d'échange, des moyens pour envoyer de l'air refroidi de la ligne d'échange à une colonne (15) du système de colonnes, un vaporiseurcondenseur (19) pour condenser un gaz de l'appareil, des moyens pour soutirer au moins un liquide (21, 22) d'une colonne du système, de préférence un liquide de purge du vaporiseur-condenseur, des moyens pour soutirer un produit gazeux ou liquide de l'appareil caractérisée en ce qu'elle comprend des moyens d'échange de chaleur (3, 11, 23) pour transférer au moins une partie des frigories contenues dans le liquide (les liquides) à de l'air à distiller en amont de la ligne d'échange, ces moyens étant situés en amont de la ligne d'échange.  5. Air separation plant in a cryogenic distillation apparatus comprising a column system (15, 17), a compressor (7), an exchange line (13), means for supplying compressed air from the compressor at the exchange line, means for sending cooled air from the exchange line to a column (15) of the column system, a condenser vaporizer (19) for condensing a gas from the apparatus, means for withdrawing at least one liquid (21, 22) from a column of the system, preferably a purge liquid from the vaporizer-condenser, means for withdrawing a gaseous or liquid product from the apparatus characterized in that it comprises heat exchange means (3, 11, 23) for transferring at least a portion of the frigories contained in the liquid (the liquids) to air to be distilled upstream of the exchange line, these means being located in upstream of the exchange line. 6. Installation selon la revendication 5 comprenant des moyens pour envoyer au moins une partie du liquide (des liquides) (21, 22) à des moyens d'échange (3) de la chaleur directe ou indirecte avec de l'air destiné à la distillation en amont du compresseur.  6. Installation according to claim 5 comprising means for sending at least a portion of the liquid (liquids) (21, 22) to exchange means (3) of direct or indirect heat with air intended for the distillation upstream of the compressor. 7. Installation selon l'une des revendications 5 ou 6 comprenant un échangeur de chaleur (3, 11, 23) et des moyens pour envoyer au moins une partie du liquide (des liquides) et au moins une partie de l'air comprimé à distiller en amont de la ligne d'échange.  7. Installation according to one of claims 5 or 6 comprising a heat exchanger (3, 11, 23) and means for sending at least a portion of the liquid (liquids) and at least a portion of the compressed air to distill upstream of the exchange line. 8. Installation selon l'une des revendications 5, 6 ou 7 comprenant un premier échangeur de chaleur (11), des moyens pour envoyer au moins une partie du liquide (des liquides) (21, 22) et un débit de fluide de refroidissement (9) au premier échangeur pour refroidir le débit de refroidissement, un deuxième échangeur (23) et des moyens pour envoyer au moins une partie du débit de fluide de refroidissement refroidi et de l'air à comprimer ou comprimé au deuxième échangeur.  8. Installation according to one of claims 5, 6 or 7 comprising a first heat exchanger (11), means for sending at least a portion of the liquid (liquids) (21, 22) and a flow of cooling fluid (9) at the first exchanger for cooling the cooling rate, a second exchanger (23) and means for sending at least a portion of the cooled cooling fluid flow rate and air to be compressed or compressed at the second exchanger. 9. Installation selon la revendication 8 dans laquelle le fluide de refroidissement (9) est de l'eau.  9. Installation according to claim 8 wherein the cooling fluid (9) is water.
FR0350903A 2003-11-25 2003-11-25 METHOD AND INSTALLATION OF AIR SEPARATION BY CRYOGENIC DISTILLATION Expired - Fee Related FR2862746B1 (en)

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