EP1310753A1 - Procédé et dispositif pour la séparation cryogénique d'air - Google Patents

Procédé et dispositif pour la séparation cryogénique d'air Download PDF

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Publication number
EP1310753A1
EP1310753A1 EP02024221A EP02024221A EP1310753A1 EP 1310753 A1 EP1310753 A1 EP 1310753A1 EP 02024221 A EP02024221 A EP 02024221A EP 02024221 A EP02024221 A EP 02024221A EP 1310753 A1 EP1310753 A1 EP 1310753A1
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EP
European Patent Office
Prior art keywords
pressure column
air
pressure
liquid
column
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02024221A
Other languages
German (de)
English (en)
Inventor
Joachim Dr. Krey
Thorsten Möller
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 AGS GmbH
Original Assignee
Messer AGS GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messer AGS GmbH filed Critical Messer AGS GmbH
Publication of EP1310753A1 publication Critical patent/EP1310753A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04387—Details relating to the work expansion, e.g. process parameter etc. using liquid or hydraulic turbine expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
    • F25J2200/52—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column in the high pressure column of a double pressure main column system
    • 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
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/10—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream the 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
    • 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
    • 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
    • F25J2240/42—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 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

Definitions

  • the invention relates to a method and a device for cryogenic decomposition of air for the production of oxygen and / or nitrogen and / or argon according to the features of the preamble of claims 1 and 5.
  • An argon-enriched side stream is used to obtain argon product Low pressure column in a crude argon column in counterflow to liquid by means of conventional rectifiers in raw argon and in a liquid residual fraction disassembled.
  • the gaseous oxygen, nitrogen and Argon products can be external using conventional Compressors can be compressed to the required pressure.
  • the oxygen, nitrogen and Argon products (LOX, LAN, LAR) can, however, be internally compressed on the desired pressure can be brought by being drawn off in liquid form Conveyor (such as centrifugal or piston pumps) on the brought necessary pressure and by heat exchange with process streams, such as preferably by means of cleaned, pre-cooled and to the necessary pressure level compressed process air, evaporated.
  • the process air liquefied by internal compression in the air separation plant is no longer available as a buoyant gas in the pressure column of the rectification column Available, which increases the effectiveness of the separation process in the rectification column reduced and thus the economy of the air separation plant is reduced.
  • the nitrogen yield in the pressure column is among others process-specific and equipment-related factors, such as the number, design and arrangement of the rectifying devices, in particular of which in the rectification devices above the Air inlet area in the pressure column adjusting thermodynamic Balance, dependent.
  • thermodynamic Losses especially those associated with throttling Flash evaporation, on. These thermodynamic losses occur through additional energy consumption in the compression of the cleaned process air noticeable.
  • the air separation plant becomes both gaseous and liquid products deducted and is further a certain flexibility in the production of Liquid products (LOX, LIN, LAR) are required, the outlet temperatures change of the process streams cooled in the heat exchange network, whereby either additional losses occur in the production of liquid products or only limited operation of the relaxation device (Expansion turbine) is possible.
  • the invention is therefore based on the object, a method and a To provide a device for the low-temperature separation of air, which an oxygen and / or nitrogen and / or argon recovery with higher Product yields with reduced energy consumption and flexible plant operation guaranteed.
  • the air is at a pressure which is only slightly above the Operating pressure of the pressure column of the rectification is compressed and by the Cooling or rectification-disturbing ingredients, such as water vapor, Hydrocarbons or nitrous oxide, exempt.
  • the second partial air flow is through indirect heat exchange with evaporating Bottom product of the pressure column to a temperature that is about 1.5 to 2.5 degrees Kelvin is above the bottom temperature of the pressure column, cooled further.
  • the pre-cooled second partial flow of air is from the Pressure column deducted and connected in one of the pressure column Relaxation device (expansion turbine) working except for the Pressure level of the pressure column relaxed.
  • the relaxed, mostly liquefied partial air flow is in the pressure and / or after relaxation to the operating pressure of the low pressure column in the same fed in and further dismantled in a known manner.
  • the advantage of this low-temperature separation of air according to the invention is in the fact that regardless of the respective driving case or driving style Air separation plant the work-relaxing device (Expansion turbine) safely operated to relax the second partial air flow can be.
  • Another significant advantage of the invention is that additional buoyancy steam generated below the lower separation stage in the pressure column of the rectification and making the thermodynamic equilibrium in the pressure column so advantageous is changed, the nitrogen yield in the pressure column is increased.
  • the higher nitrogen yield achieved in the pressure column according to the invention increases the effectiveness of the low pressure column and any downstream one Argon rectification and thus enables economical low-temperature reduction of air with higher product yields with reduced Power consumption.
  • the invention further relates to a device for performing the The inventive method with a two-stage rectification column, the pressure and Low pressure column through a condenser / evaporator in heat exchanging Connected, a Rohargonklale, a heat exchange network and one Expansion device (expansion turbine), which can be Product lines equipped with control, regulation and conveyor systems are interconnected.
  • the low-temperature decomposition of air according to the invention is in particular also for exclusive oxygen production and for exclusive nitrogen production suitable.
  • Air 1 to be rectified is compressed in a compressor 2 to a pressure which is only slightly higher than the operating pressure of a pressure column 7 and is then cleaned in an adsorption dryer 3 of undesired ingredients.
  • a first partial stream 4 of the compressed and cleaned air 1 is cooled in a heat exchanger network 5 by indirect heat exchange in countercurrent with a vaporous product stream 6 drawn off from a low pressure column 11 down to a temperature range of the dew point of the air 1.
  • the predominantly gaseous partial stream 4 of the air 1 which has been pretreated in this way is fed directly below the rectifying devices into the pressure column 7 and is broken down there in a known manner into an oxygen-rich bottom liquid 8 and an oxygen-poor gaseous top product.
  • a second partial flow 9 of the compressed and cleaned air 1 becomes one further compressor 10 supplied.
  • the partial flow 9 of the air 1 compressed in the compressor 10 to a pressure level suitable for the evaporation of the 12 liquid oxygen product 13 drawn off from the pressure column and then conveyed to the desired product pressure level is then countercurrent in the heat exchange network 5 by indirect heat exchange with one from the low pressure column 11 withdrawn and pumped liquid sump product 13 cooled to the temperature range of the dew point of the air and fed into a sump evaporator 14 of the pressure column 7 and cooled by indirect heat exchange with evaporating bottom liquid 8 to a temperature which is about 1.5 to 2.5 degrees Kelvin above the temperature of the bottom liquid 8 of the pressure column 7.
  • the partial stream 9a cooled in this way is fed into an expansion device (expansion turbine) 15 connected downstream of the pressure column 7 and is expanded in this work-performing manner to the pressure level of the pressure column 7.
  • the now predominantly liquid partial flow 9b of air 1 is in the range of conventional rectifiers in the pressure and / or low pressure column 7,11 fed in and rectified in a known manner, the partial stream 9b before it is fed into the low-pressure column 11 to the operating pressure of the Low pressure column 11 is throttled.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP02024221A 2001-11-10 2002-10-31 Procédé et dispositif pour la séparation cryogénique d'air Withdrawn EP1310753A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10155383 2001-11-10
DE10155383A DE10155383A1 (de) 2001-11-10 2001-11-10 Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft

Publications (1)

Publication Number Publication Date
EP1310753A1 true EP1310753A1 (fr) 2003-05-14

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ID=7705384

Family Applications (1)

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EP02024221A Withdrawn EP1310753A1 (fr) 2001-11-10 2002-10-31 Procédé et dispositif pour la séparation cryogénique d'air

Country Status (2)

Country Link
EP (1) EP1310753A1 (fr)
DE (1) DE10155383A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1338856A2 (fr) * 2002-01-31 2003-08-27 L'AIR LIQUIDE, Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédé et installation pour la séparation d'air par distillation cryogénique
FR2848650A1 (fr) * 2002-12-13 2004-06-18 Air Liquide Procede et appareil de detente d'un fluide cryogenique
EP3312533A1 (fr) * 2016-10-18 2018-04-25 Linde Aktiengesellschaft Procédé de séparation de l'air et installation de séparation de l'air
EP3620739A1 (fr) * 2018-09-05 2020-03-11 Linde Aktiengesellschaft Procédé de décomposition à basse température de l'air et installation de décomposition de l'air

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286314A1 (fr) * 1987-04-07 1988-10-12 The BOC Group plc Procédé de séparation d'air
US4854954A (en) * 1988-05-17 1989-08-08 Erickson Donald C Rectifier liquid generated intermediate reflux for subambient cascades
US5379598A (en) * 1993-08-23 1995-01-10 The Boc Group, Inc. Cryogenic rectification process and apparatus for vaporizing a pumped liquid product
US5878597A (en) * 1998-04-14 1999-03-09 Praxair Technology, Inc. Cryogenic rectification system with serial liquid air feed
US5901577A (en) * 1997-04-03 1999-05-11 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and plant for air separation by cryogenic distillation
US6141990A (en) * 1998-03-11 2000-11-07 Air Liquide America Corporation Process and plant for separating air by cryogenic distillation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286314A1 (fr) * 1987-04-07 1988-10-12 The BOC Group plc Procédé de séparation d'air
US4854954A (en) * 1988-05-17 1989-08-08 Erickson Donald C Rectifier liquid generated intermediate reflux for subambient cascades
US5379598A (en) * 1993-08-23 1995-01-10 The Boc Group, Inc. Cryogenic rectification process and apparatus for vaporizing a pumped liquid product
US5901577A (en) * 1997-04-03 1999-05-11 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and plant for air separation by cryogenic distillation
US6141990A (en) * 1998-03-11 2000-11-07 Air Liquide America Corporation Process and plant for separating air by cryogenic distillation
US5878597A (en) * 1998-04-14 1999-03-09 Praxair Technology, Inc. Cryogenic rectification system with serial liquid air feed

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1338856A2 (fr) * 2002-01-31 2003-08-27 L'AIR LIQUIDE, Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédé et installation pour la séparation d'air par distillation cryogénique
EP1338856A3 (fr) * 2002-01-31 2003-09-10 L'AIR LIQUIDE, Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédé et installation pour la séparation d'air par distillation cryogénique
FR2848650A1 (fr) * 2002-12-13 2004-06-18 Air Liquide Procede et appareil de detente d'un fluide cryogenique
EP3312533A1 (fr) * 2016-10-18 2018-04-25 Linde Aktiengesellschaft Procédé de séparation de l'air et installation de séparation de l'air
EP3620739A1 (fr) * 2018-09-05 2020-03-11 Linde Aktiengesellschaft Procédé de décomposition à basse température de l'air et installation de décomposition de l'air
WO2020048634A1 (fr) 2018-09-05 2020-03-12 Linde Aktiengesellschaft Procédé de séparation cryogénique d'air et système de séparation d'air

Also Published As

Publication number Publication date
DE10155383A1 (de) 2003-05-28

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