FR2756367A1 - System for feeding an air separator using an adiabatic compressor - Google Patents

System for feeding an air separator using an adiabatic compressor Download PDF

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Publication number
FR2756367A1
FR2756367A1 FR9800262A FR9800262A FR2756367A1 FR 2756367 A1 FR2756367 A1 FR 2756367A1 FR 9800262 A FR9800262 A FR 9800262A FR 9800262 A FR9800262 A FR 9800262A FR 2756367 A1 FR2756367 A1 FR 2756367A1
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Prior art keywords
air
separation device
adiabatic compressor
exchange line
adiabatic
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FR9800262A
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French (fr)
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FR2756367B1 (en
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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
    • F25J3/04151—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • 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
    • F25J3/04151—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
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
    • F25J3/04575—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for a gas expansion plant, e.g. dilution of the combustion gas in a gas turbine
    • F25J3/04581—Hot gas expansion of indirect heated 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04612—Heat exchange integration with process streams, e.g. from the air gas consuming unit
    • F25J3/04618—Heat exchange integration with process streams, e.g. from the air gas consuming unit for cooling an air stream fed to the air fractionation unit
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
    • F25J2205/70—Heating the adsorption vessel
    • 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
    • F25J2230/06—Adiabatic compressor, i.e. without interstage 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

Process and installation for feeding an air separator in which at least one of the air compressors is adiabatic. Process and installation for feeding an air separator by cryogenic distillation in which at least part of the air intended for the separator is cooled in an exchange line (5) by a flow of one of the gases from the air, in particular impure nitrogen and the gas flow is humidified before it enters the exchange line.

Description

La présente invention concerne un procédé et une installation pour l'alimentation pour un appareil de séparation d'air. The present invention relates to a method and an installation for the supply for an air separation apparatus.

Les appareils de séparation des gaz de l'air sont généralement alimentés en air à partir d'au moins un compresseur isotherme équipé de réfrigérants inter étages dans lesquels l'air est refroidi par échange de sa chaleur avec l'air de réfrigération. Air gas separation devices are generally supplied with air from at least one isothermal compressor fitted with inter-stage refrigerants in which the air is cooled by heat exchange with the cooling air.

L'air sortant du compresseur est lui-même refroidi dans un réfrigérant final ou dans une tour air/eau, associée en général à une tour eau/azote et/ou un groupe frigorifique. Ce système généralement appelé prérefroidissement permet d'obtenir de l'air à une température relativement faible (environ 15 OC) avant de le diriger vers la dessiccation limitant aussi la taille de cette dernière, la quantité d'eau contenue dans l'air augmentant exponentiellement avec la température. De tels systèmes sont décrits dans Current Alternatives by the
Use of CFCs in Air Separation and Liquefaction Processes de Walter F. Castle, Kryogenika 1996.The air leaving the compressor is itself cooled in a final refrigerant or in an air / water tower, generally associated with a water / nitrogen tower and / or a refrigeration unit. This system generally called precooling makes it possible to obtain air at a relatively low temperature (around 15 ° C.) before directing it towards drying also limiting the size of the latter, the quantity of water contained in the air increasing exponentially. with the temperature. Such systems are described in Current Alternatives by the
Use of CFCs in Air Separation and Liquefaction Processes by Walter F. Castle, Kryogenika 1996.

Il est connu d'utiliser la chaleur du réfrigérant du compresseur pour réchauffer le gaz de régénération de
JP-A-62-335 691, de JP-196772/94, de FR-2 686 405 et de
JP-A-07144114.It is known to use the heat of the compressor refrigerant to heat the regeneration gas of
JP-A-62-335 691, JP-196772/94, FR-2 686 405 and
JP-A-07144114.

Or les compresseurs utilisés sont des compresseurs isothermes. The compressors used are isothermal compressors.

Il est un objet de la présente invention de diminuer le montant de l'investissement d'une unité de séparation d'air. It is an object of the present invention to reduce the amount of investment of an air separation unit.

Selon l'objet de l'invention, il est prévu un procédé d'alimentation pour un appareil de séparation d'air dans lequel au moins un des compresseurs d'air est un compresseur adiabatique. According to the subject of the invention, there is provided a supply method for an air separation device in which at least one of the air compressors is an adiabatic compressor.

Selon d'autres aspects de l'invention
- tout l'air comprimé par le compresseur adiabatique est envoyé à l'appareil de séparation d'air
- l'air provenant du compresseur adiabatique est refroidi par au moins un gaz de l'air provenant de l'appareil de séparation d'air
- un des gaz de l'air réchauffé par l'air comprimé dans le compresseur adiabatique est ensuite envoyé à une unité d'épuration de l'air où il sert à la régénération
- le gaz de l'air envoyé à la régénération est un gaz humidifié
- l'air provenant du compresseur adiabatique est refroidi par des gaz de l'air provenant de l'appareil de séparation dans une ligne d'échange avant d'être envoyé à une unité d'épuration où il est épuré en eau et/ou en Co2
- l'air épuré est renvoyé à la ligne d'échange
- l'épuration en eau et l'épuration en C02 ont lieu à deux températures différentes
- au moins une partie de l'air destiné à l'appareil est refroidi dans une ligne d'échange par un débit d'un gaz de l'air, notamment de l'azote impur provenant de l'appareil de séparation caractérisé en ce que le débit d'un gaz de l'air est humidifié avant de rentrer dans la ligne
Selon un autre objet de l'invention, il est prévu une installation pour l'alimentation d'un appareil de séparation d'air dans lequel au moins un des compresseurs d'air est un compresseur adiabatique.According to other aspects of the invention
- all the air compressed by the adiabatic compressor is sent to the air separation unit
- the air coming from the adiabatic compressor is cooled by at least one gas from the air coming from the air separation device
- one of the gases in the air heated by the compressed air in the adiabatic compressor is then sent to an air purification unit where it is used for regeneration
- the air gas sent for regeneration is a humidified gas
the air coming from the adiabatic compressor is cooled by gases from the air coming from the separation device in an exchange line before being sent to a purification unit where it is purified with water and / or in Co2
- the purified air is returned to the exchange line
- water purification and C02 purification take place at two different temperatures
- at least part of the air intended for the device is cooled in an exchange line by a flow of an air gas, in particular impure nitrogen coming from the separation device characterized in that that the flow of a gas from the air is humidified before entering the line
According to another object of the invention, an installation is provided for supplying an air separation device in which at least one of the air compressors is an adiabatic compressor.

Selon d'autres aspects de l'invention
- le compresseur adiabatique est dédié à l'appareil de séparation d'air;
- l'appareil de séparation d'air est un appareil de distillation cryogénique
- il y a une ligne d'échange et des moyens pour envoyer l'air provenant du compresseur adiabatique et au moins un des gaz de l'air provenant de l'appareil de séparation d'air à cette ligne d'échange
- il y des moyens pour humidifier un des gaz de l'air en amont de la ligne d'échange. According to other aspects of the invention
- the adiabatic compressor is dedicated to the air separation device;
- the air separation device is a cryogenic distillation device
- there is an exchange line and means for sending the air coming from the adiabatic compressor and at least one of the air gases coming from the air separation device to this exchange line
- There are means to humidify one of the air gases upstream of the exchange line.

Selon un autre objet de l'invention, il est prévu un procédé pour l'alimentation d'un appareil de séparation d'air par distillation cryogénique dans lequel au moins une partie de l'air destiné à l'appareil A est refroidi dans une ligne d'échange par un débit d'un gaz de l'air, notamment de l'azote impur provenant de l'appareil de séparation caractérisé en ce que le débit d'un gaz de l'air est humidifié avant de rentrer dans la ligne d'échange. According to another object of the invention, there is provided a method for feeding an air separation device by cryogenic distillation in which at least part of the air intended for the device A is cooled in a exchange line by a flow rate of an air gas, in particular impure nitrogen coming from the separation device characterized in that the flow rate of an air gas is humidified before entering the exchange line.

Selon un autre objet de l'invention, il est prévu une installation pour l'alimentation d'un appareil de séparation d'air par distillation cryogénique comprenant des moyens pour envoyer un débit d'air et un gaz de l'air à une ligne d'échange, caractérisée en ce qu'elle comprend des moyens pour humidifier le gaz de l'air en amont de la ligne d'échange. According to another object of the invention, an installation is provided for supplying an air separation device by cryogenic distillation comprising means for sending an air flow and an air gas to a line. exchange, characterized in that it comprises means for humidifying the gas of the air upstream of the exchange line.

Comme les compresseurs adiabatiques n'ont pas de réfrigérant, le coût de l'installation est réduit en supprimant les réfrigérants à eau sur le circuit d'alimentation en air de l'unité de séparation de gaz de l'air ainsi que l'ensemble du circuit d'eau de refroidissement associé, incluant entre autres, les tours de réfrigération d'eau, le traitement de l'eau, les pompes à eau, le réseau de distribution, la robinetterie, les alimentations électriques et l'instrumentation associée, et enfin le système de prérefroidissement à l'eau de l'air alimentant l'unité de séparation de gaz de l'air. As the adiabatic compressors have no refrigerant, the installation cost is reduced by eliminating the water refrigerants on the air supply circuit of the air gas separation unit as well as the assembly the associated cooling water circuit, including among others, water cooling towers, water treatment, water pumps, distribution network, valves, electrical supplies and associated instrumentation, and finally the air water pre-cooling system supplying the air gas separation unit.

Cette invention a également l'avantage de diminuer les coûts d'exploitation par une réduction importante de la consommation d'eau, par une suppression des coûts de maintenance du réseau d'eau associée à une suppression des problèmes éventuels de corrosion du circuit d'eau et le remplacement périodique de certains composants (réfrigérants, etc) et par la suppression de la consommation électrique des pompes à eau et des ventilateurs des tours de réfrigération d'eau.  This invention also has the advantage of reducing operating costs by a significant reduction in water consumption, by eliminating maintenance costs of the water network associated with eliminating possible corrosion problems of the circuit. water and the periodic replacement of certain components (refrigerants, etc.) and by eliminating the electrical consumption of water pumps and fans of water cooling towers.

En cas de système d'épuration de l'air en eau et C02 de type dessiccation décarbonation à lit(s) d'adsorbant(s) ou de tout autre système ne permettant pas l'épuration dans la ligne d'échange, l'air sera soutiré de la ligne d'échange avec les produits sortants pour être épuré en eau et en CO2 puis réintégré dans la ligne d'échange. La température de soutirage de l'air sera choisie de façon à optimiser la taille du système d'épuration en eau et CO2. In the case of a system for purifying air from water and C02 of the decarbonation desiccation type with a bed (s) of adsorbent (s) or any other system which does not allow purification in the exchange line, the air will be drawn from the exchange line with the outgoing products to be purified of water and CO2 and then reintegrated into the exchange line. The air withdrawal temperature will be chosen so as to optimize the size of the water and CO2 purification system.

D'autre part, les épurations en eau et C02 pourront être effectuées à deux températures de soutirage différentes, qui seront choisies de façon à optimiser économiquement l'ensemble du système ligne d'échange et épuration.On the other hand, the water and CO 2 purifications can be carried out at two different withdrawal temperatures, which will be chosen so as to economically optimize the entire exchange and purification line system.

Un exemple de mise en oeuvre de l'invention va maintenant être décrit en regard du dessin annexé sur lequel
- la figure 1 représente schématiquement une installation pour l'alimentation d'un appareil de séparation d'air conforme à l'invention.An example of implementation of the invention will now be described with reference to the attached drawing in which
- Figure 1 schematically shows an installation for the supply of an air separation device according to the invention.

Tout l'air destiné à l'appareil de séparation d'air A est comprimé par un compresseur d'air adiabatique 1. L'air comprimé est à 200 OC et doit être refroidi soit à l'aide d'un réfrigérant à eau (à contact direct ou non) soit par échange de chaleur avec tous les produits ou une partie des produits sortant de l'appareil de séparation A soit par passage dans un groupe frigorifique à absorption soit par plusieurs de ces systèmes. Dans l'exemple, de l'azote impur 3 provenant de l'appareil A refroidit l'air qui passe dans l'échangeur 5. All the air intended for the air separation device A is compressed by an adiabatic air compressor 1. The compressed air is at 200 ° C. and must be cooled either using a water cooler ( in direct contact or not) either by heat exchange with all the products or a part of the products leaving the separation device A or by passage through an absorption refrigeration unit or by several of these systems. In the example, impure nitrogen 3 from device A cools the air which passes through exchanger 5.

L'air est ensuite épuré dans l'unité d'épuration 7, qui est régénérée par une partie de l'azote impur réchauffé dans l'échangeur 5. The air is then purified in the purification unit 7, which is regenerated by a portion of the impure nitrogen heated in the exchanger 5.

L'azote impur peut être saturé en eau en amont de l'échangeur 5 ce qui entraîne une baisse de la température de celui-ci et augmente de la sorte sa capacité à refroidir l'air entrant (voir flèche H2O en pointillés).  The impure nitrogen can be saturated with water upstream of the exchanger 5, which causes the temperature of the latter to drop and thus increases its ability to cool the incoming air (see arrow H2O in dotted lines).

L'air provenant du compresseur adiabatique 1 peut se refroidir contre d'autres débits de gaz de l'air à part l'azote impur, dans la ligne d'échange.  The air coming from the adiabatic compressor 1 can cool against other air gas flows apart from impure nitrogen, in the exchange line.

Claims (12)

REVENDICATIONS 1. Procédé d'alimentation pour un appareil de séparation d'air dans lequel au moins un des compresseurs d'air est un compresseur adiabatique (1) et l'air provenant du compresseur adiabatique (1) est refroidi par des gaz de l'air provenant de l'appareil de séparation (A) dans une ligne d'échange (5) avant d'être envoyé à une unité d'épuration (7) où il est épuré en eau et/ou en CO2. 1. Supply method for an air separation apparatus in which at least one of the air compressors is an adiabatic compressor (1) and the air coming from the adiabatic compressor (1) is cooled by gases from the air from the separation device (A) in an exchange line (5) before being sent to a purification unit (7) where it is purified in water and / or CO2. 2. Procédé selon la revendication 1 dans lequel tout l'air comprimé par le compresseur adiabatique (1) est envoyé à l'appareil de séparation d'air (A). 2. Method according to claim 1 wherein all the air compressed by the adiabatic compressor (1) is sent to the air separation device (A). 3. Procédé selon l'une des revendications 1 ou 2 dans lequel l'air provenant du compresseur adiabatique (1) est refroidi par au moins un gaz de l'air provenant de l'appareil de séparation d'air (A). 3. Method according to one of claims 1 or 2 wherein the air from the adiabatic compressor (1) is cooled by at least one gas from the air from the air separation device (A). 4. Procédé selon la revendication 3 dans lequel un des gaz de l'air réchauffé par l'air comprimé dans le compresseur adiabatique (1) est ensuite envoyé à une unité d'épuration de l'air (7) où il sert à la régénération. 4. Method according to claim 3 wherein one of the gases of the air heated by the compressed air in the adiabatic compressor (1) is then sent to an air cleaning unit (7) where it is used for the regeneration. 5. Procédé selon la revendication 4 dans lequel le gaz de l'air envoyé à la régénération est un gaz humidifié. 5. The method of claim 4 wherein the gas of the air sent for regeneration is a humidified gas. 6. Procédé selon une des revendications précédentes dans lequel l'air épuré est renvoyé à la ligne d'échange (5). 6. Method according to one of the preceding claims wherein the purified air is returned to the exchange line (5). 7. Procédé selon une des revendications précédentes dans lequel l'épuration en eau et l'épuration en CO2 ont lieu à deux températures différentes. 7. Method according to one of the preceding claims wherein the water purification and CO2 treatment take place at two different temperatures. 8. Installation pour l'alimentation d'un appareil de séparation d'air dans lequel au moins un des compresseurs d'air est un compresseur adiabatique (1) et des moyens pour refroidir l'air provenant du compresseur adiabatique et pour envoyer l'air refroidi à une unité d'épuration. 8. Installation for supplying an air separation device in which at least one of the air compressors is an adiabatic compressor (1) and means for cooling the air coming from the adiabatic compressor and for sending the air cooled at a purification unit. 9. Installation selon la revendication 8 dans laquelle le compresseur adiabatique (1) est dédié à l'appareil de séparation d'air (A).  9. Installation according to claim 8 wherein the adiabatic compressor (1) is dedicated to the air separation device (A). 10. Installation selon la revendication 8 ou 9 dans laquelle l'appareil de séparation d'air est un appareil de distillation cryogénique. 10. Installation according to claim 8 or 9 wherein the air separation device is a cryogenic distillation device. 11. Installation selon l'une des revendications 8 à 10 comprenant une ligne d'échange (5) et des moyens pour envoyer l'air provenant du compresseur adiabatique (1) et au moins un des gaz de l'air provenant de l'appareil de séparation d'air (A) à cette ligne d'échange. 11. Installation according to one of claims 8 to 10 comprising an exchange line (5) and means for sending the air from the adiabatic compressor (1) and at least one of the air gases from the air separation device (A) at this exchange line. 12. Installation selon l'une des revendications 8 à 11 comprenant des moyens pour humidifier un des gaz de l'air en amont de la ligne d'échange.  12. Installation according to one of claims 8 to 11 comprising means for humidifying one of the air gases upstream of the exchange line.
FR9800262A 1998-01-13 1998-01-13 METHOD AND INSTALLATION FOR SUPPLYING AN AIR SEPARATION APPARATUS Expired - Fee Related FR2756367B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069454A1 (en) * 1981-06-18 1983-01-12 Air Products And Chemicals, Inc. Method and apparatus for compressing gas
US5089034A (en) * 1990-11-13 1992-02-18 Uop Process for purifying natural gas
FR2686405A1 (en) * 1992-01-20 1993-07-23 Air Liquide Air separation method and installation, and application of such an installation
JPH07144114A (en) * 1993-11-26 1995-06-06 Kawasaki Steel Corp Device for shortening regeneration time of pretreatment adsorber for feed air used for air liquefying separator
EP0833119A2 (en) * 1996-09-25 1998-04-01 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and plant for supplying an air separation unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069454A1 (en) * 1981-06-18 1983-01-12 Air Products And Chemicals, Inc. Method and apparatus for compressing gas
US5089034A (en) * 1990-11-13 1992-02-18 Uop Process for purifying natural gas
FR2686405A1 (en) * 1992-01-20 1993-07-23 Air Liquide Air separation method and installation, and application of such an installation
JPH07144114A (en) * 1993-11-26 1995-06-06 Kawasaki Steel Corp Device for shortening regeneration time of pretreatment adsorber for feed air used for air liquefying separator
EP0833119A2 (en) * 1996-09-25 1998-04-01 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and plant for supplying an air separation unit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 095, no. 009 31 October 1995 (1995-10-31) *

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