EP0758733B1 - Procédé de séparation d'air par rectification à basse température - Google Patents

Procédé de séparation d'air par rectification à basse température Download PDF

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Publication number
EP0758733B1
EP0758733B1 EP96112620A EP96112620A EP0758733B1 EP 0758733 B1 EP0758733 B1 EP 0758733B1 EP 96112620 A EP96112620 A EP 96112620A EP 96112620 A EP96112620 A EP 96112620A EP 0758733 B1 EP0758733 B1 EP 0758733B1
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Prior art keywords
stream
air
liquid
pressure
rectifier
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German (de)
English (en)
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EP0758733A2 (fr
EP0758733A3 (fr
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Helmut Dipl.-Ing. Attlfellner
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Linde GmbH
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Linde GmbH
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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
    • F25J3/04012—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
    • F25J3/04006—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
    • F25J3/04024—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 purified feed air, so-called boosted air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—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
    • F25J3/0403—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 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
    • F25J3/04006—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
    • F25J3/04006—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
    • F25J3/04103—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 using solely hydrostatic liquid head
    • 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
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
    • F25J3/04127—Gas turbine as the prime mechanical driver
    • 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
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04145—Mechanically coupling of different compressors of the air fractionation process to the same driver(s)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F25J3/04357—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen and comprising a gas work expansion 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
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04593—The air gas consuming unit is also fed by an air stream
    • F25J3/046—Completely integrated air feed compression, i.e. common MAC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00—Refrigeration
    • Y10S62/915—Combustion

Definitions

  • the invention relates to a method for air separation by low-temperature rectification in a rectification column system which has at least one rectification column with steps (a) to (h) listed in claim 1.
  • Such methods integrate the air separation by distillation and a process in which Compressed air and possibly air gases are consumed by the feed air for the Air separator and the air required in the chemical process are compressed together become.
  • the work-related relaxation of exhaust gases from the chemical Reaction generated mechanical energy is often used to generate electrical energy Energy used. If necessary, mechanical energy can also be used directly Air compression can be used.
  • the chemical reaction can be for example, coal gasification or combustion.
  • one of the products is removed from the rectification in liquid form liquid state pressurized and then against one accordingly condensed process stream evaporates, the latter at least partially condensed.
  • this internal compression it is possible to produce a gaseous product, as is often the case is required for a chemical process, with relatively little equipment to manufacture.
  • a method of the type mentioned at the outset is known from EP-A-0 584 419.
  • part of the compressed air is fed to a combustion chamber, the rest serves as Feed air for air separation.
  • Liquid oxygen becomes a low pressure stage Double rectification column removed, pressurized with a pump and counter post-compressed air evaporates.
  • the invention is based, such a method and a task to design the corresponding device so that the process is energetically special can be driven cheaply.
  • This object is achieved in that at least part of the mechanical Energy used in the work-related relaxation of the exhaust gas of the chemical Reaction is generated, is used for post-compression of the process stream, which is used for Evaporation of the liquid product stream by indirect heat exchange is used.
  • the process stream for evaporation of the liquid product can by a part of the first partial stream of the compressed air or from a nitrogen product stream the or one of the rectification columns are formed.
  • the first case it is preferred part of the feed air compressed to at least rectification pressure, partially or completely condensed against the evaporating liquid product and then fed into the or one of the rectification columns.
  • gaseous nitrogen for example from the pressure column of a double rectification column removed, post-compressed, at least partially condensed and as reflux one of the rectification columns abandoned and / or withdrawn as a liquid product.
  • Work generated in the refrigeration cycle can be used to recompress the process stream can be used, for example, via a second compressor, which mechanically with the expansion machine for the process stream is coupled.
  • This second Compressor can precompress the compressor coupled to the gas turbine downstream.
  • the liquid product stream from the lower Area of the low pressure column can be removed so that gaseous oxygen as internally compressed printed product is obtained.
  • Nitrogen e.g. from the top of the pressure column
  • argon from one connected argon rectification liquid pressure and against the post-compressed process stream are evaporated.
  • the liquid product or products before or after internal compression in a liquid tank caching it is possible the liquid product or products before or after internal compression in a liquid tank caching.
  • the invention also relates to a device for air separation by Low temperature rectification according to claim 8.
  • atmospheric air is drawn in through a filter 2, in an air compressor 3 compressed to a pressure of 5 to 14 bar, preferably 5.5 to 6.5 bar and then divided into a first partial flow 4 and a second partial flow 5.
  • the second partial stream 5 is fed to a combustion chamber 6 and there with a fuel 7 burned.
  • the exhaust gas 8 from the combustion is working in a gas turbine 9 relaxed.
  • the first partial stream 4 is freed from the heat of compression (aftercooler 10), in direct heat exchange with water 11 further cooled in a molecular sieve system 12 cleaned and fed via line 13 to the main heat exchanger 14.
  • the on about Dew point cooled air is a via line 15 of the pressure column 17 Double rectification column 16 fed, preferably directly above the sump.
  • the Operating pressure of the pressure column 17 is 5 to 14 bar, preferably 5.5 to 6.5 bar. At the Gaseous nitrogen produced at the top of the pressure column 17 becomes in the main condenser 19 liquefied against evaporating oxygen from the bottom of the low pressure column 18.
  • the condensate 20 is returned to the pressure column 17 (line 21) or - after subcooling in counterflow 23 - on the low pressure column 18 abandoned (line 22).
  • Oxygenated bottom liquid 24 from the Pressure column 17 is also supercooled (23) and at an intermediate level in the Low pressure column 18 (operating pressure 1.3 to 2 bar, preferably 1.5 to 1.7 bar) fed.
  • Gaseous nitrogen 25 from the top of the low pressure column can go after Heating in the counterflow 23 and in the main heat exchanger 14 via line 26 as Product will be deducted.
  • At least part of the oxygen product generated in the low pressure column 17 is withdrawn in liquid form (line 27) and brought to pressure by means of a pump 28, for example to 5 to 110 bar, depending on the product pressure required.
  • the pressure can be increased by static height or by Pressure build-up evaporation can be effected in a liquid tank.
  • the High-pressure liquid is evaporated in the main heat exchanger 14 and via line 29 dissipated as a gaseous printed product.
  • product evaporation is all in one Condenser evaporator separate from the main heat exchanger possible (see for example EP-A-0 584 419).
  • a part 30 of the cleaned feed air is used as Process stream used, which is used for the evaporation of the internally compressed Liquid product supplies the required heat. It is in a first post-compressor 31 and a second post-compressor 33 to a pressure of 12 to 120 bar, preferably 15 brought up to 60 bar.
  • the heat of compression is in each case in an aftercooler 32, 34 away.
  • the post-compressed air condenses at least in the main heat exchanger 14 partially, preferably completely against the evaporating liquid oxygen and is throttled via line 35 into the pressure column 17.
  • the entry point is located preferably some theoretical floors above the introduction of the main air (line 15).
  • a portion 36 of the post-compressed air is between the two post-compressors 31, 33 branched off at a temperature between the warm and cold ends of the Main heat exchanger lying temperature supplied to a turbine 37 and there Working from 10 to 60 bar, preferably 12 to 50 bar to about Pressure column pressure relaxed. The mechanical energy generated thereby becomes Post-compression 33 is used. The relaxed air 38 is shared with the Main air 15 led to the pressure column 17.
  • the turbine can 37 leading branch, the second post-compressor 33 and the after-cooler 34 omitted become.
  • the pressure required for the evaporation of the liquid product must then can be achieved in the first (and only) post-compressor 31.
  • the embodiment shown in Figure 2 differs from Figure 1 by Use of nitrogen 230 from the pressure column 17 instead of air for the Evaporation of the liquid pressurized oxygen.
  • the nitrogen gas 230 is first in the Main heat exchanger 14 warmed to about ambient temperature and then in the first post-compressor 231 and in the second post-compressor 233 to a pressure of brought from 12 to 120 bar, preferably 15 to 60 bar.
  • Part of the redensified Nitrogen is in the main heat exchanger 14 against the evaporating Liquid oxygen at least partially, preferably completely condensed and over Line 235 throttled in the pressure column 17; another part 236 is in the turbine 237, which drives the second post-compressor 233, relaxed to approximately pressure column pressure and returned to the circuit via line 238.
  • It is an embodiment with low or otherwise covered cooling requirements possible to do without the turbine-compressor combination 237/233.
  • gas turbine 9, air compressor 3 and first are seated Post-compressor 31/231, preferably on a common shaft. It depends on the mechanical energy generated in the gas turbine (taking into account the Efficiency of the machines) less or greater than that of the driven ones Compressors 3, 31/231 required power can also be a motor or generator sit on the common wave.
  • the mass transfer elements in pressure column 17 and low pressure column 18 can be made from conventional still bottoms, packing (disordered pack) and / or orderly pack exist. Combinations of different types of elements in a column are possible. Because of the low pressure drop, orderly ones Packs in all columns, especially in the low pressure column, preferred.

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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)

Claims (8)

  1. Procédé de fractionnement d'air par rectification à basse température dans un système de colonnes de rectification (16), qui présente au moins une colonne de rectification (17, 18), avec les étapes suivantes :
    (a) compression (3) d'un courant d'air (1) à au moins la pression la plus élevée qui règne à l'intérieur du système de colonnes de rectification (16),
    (b) subdivision du courant d'air comprimé dans un premier courant partiel (4), qui sert de courant d'air d'alimentation pour le système de colonnes de rectification, et en un deuxième courant partiel (5), qui est acheminé en tant qu'agent d'oxydation à une réaction chimique (6),
    (c) détente (9), fournissant du travail, d'au moins une partie du gaz de rejet (8) de la réaction chimique (7),
    (d) refroidissement (14) du premier courant partiel (4) à environ la température de point de rosée et introduction (15) dans la colonne, respectivement dans l'une des colonnes de rectification (17),
    (e) extraction d'un courant de produit liquide (27) de la colonne, respectivement de l'une des colonnes de rectification (18),
    (f) augmentation (28) de la pression dans le courant de produit liquide (27),
    (g) recompression (31, 33; 231, 233) d'un courant de processus (30; 230) de la rectification à basse température à une pression qui se situe substantiellement au-dessus de la pression la plus élevée régnant dans le système de colonnes de rectification (16), et
    (h) évaporation du courant de produit liquide par échange thermique indirect (14) avec au moins une partie (35, 235) du courant de processus recomprimé, caractérisé en ce que
    (i) au moins une partie de l'énergie mécanique, qui est produite dans l'étape (c) lors de la détente (9), fournissant du travail, du gaz de rejet (8) de la réaction chimique (7), est utilisée dans l'étape (g) en vue de la recompression (31) du courant de processus (30; 230).
  2. Procédé selon la revendication 1, caractérisé en ce qu'une partie de l'énergie mécanique, qui est produite dans l'étape (c) lors de la détente (9), fournissant du travail, du gaz de rejet (8) de la réaction chimique (7), est utilisée dans l'étape (a) en vue de la compression (3) du courant d'air (1).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le courant de processus est formé par une partie (30) du premier courant partiel (4) de l'air comprimé.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que le courant de processus est formé par un courant de produit d'azote (230) en provenance de la colonne ou de l'une des colonnes de rectification (17).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'une partie (36; 236) du courant de processus recomprimé, qui n'est pas amenée en échange thermique indirect avec le courant de produit liquide en cours d'évaporation (27), est détendue en fournissant du travail (37; 237).
  6. Procédé selon la revendication 5, caractérisé en ce qu'au moins une partie de l'énergie mécanique, qui est produite lors de la détente fournissant du travail (37; 237) de la partie (36; 236) du courant de processus, est utilisée en vue de la recompression (33) du courant de processus.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le système de colonnes de rectification présente une colonne pressurisée (17) et une colonne basse pression (18), le courant de produit liquide (27) étant extrait du domaine inférieur de la colonne basse pression (18).
  8. Dispositif de fractionnement d'air par rectification à basse température ayant un système de colonnes de rectification (16), qui présente au moins une colonne de rectification (17, 18) tout comme
    (a) un compresseur d'air (3),
    (b) une première conduite d'air (4), qui conduit de la sortie du compresseur d'air (3), à travers un échangeur thermique principal (14), au système de colonnes de rectification (16),
    (c) une deuxième conduite d'air (5), qui conduit de la sortie du compresseur d'air (3) à un dispositif de réaction chimique (6),
    (d) une turbine à gaz (9), dont l'entrée est raccordée à la sortie du dispositif de réaction chimique (6),
    (e) une conduite de produit liquide (27) en vue de l'extraction d'un courant de produit liquide en provenance de la colonne, respectivement de l'une des colonnes de rectification (18),
    (f) un moyen (28) en vue de l'augmentation de la pression dans le courant de produit liquide,
    (g) des moyens (33, 31; 231; 233) en vue de la recompression d'un courant de processus (30; 230) de la rectification à basse température à une pression qui se situe substantiellement au-dessus de la pression la plus élevée régnant dans le système de colonnes de rectification (16), et
    (h) des moyens (14) en vue de l'évaporation du courant de produit liquide par échange thermique indirect avec au moins une partie du courant de processus recomprimé,
    caractérisé par
       (i) des moyens en vue du transfert d'au moins une partie de l'énergie mécanique produite dans la turbine à gaz (9) aux moyens (31; 231) en vue de la recompression du courant de processus.
EP96112620A 1995-08-11 1996-08-05 Procédé de séparation d'air par rectification à basse température Expired - Lifetime EP0758733B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19529681 1995-08-11
DE19529681A DE19529681C2 (de) 1995-08-11 1995-08-11 Verfahren und Vorrichtung zur Luftzerlegung durch Tieftemperaturrektifikation

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EP0758733A2 EP0758733A2 (fr) 1997-02-19
EP0758733A3 EP0758733A3 (fr) 1997-07-30
EP0758733B1 true EP0758733B1 (fr) 2000-11-02

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EP (1) EP0758733B1 (fr)
DE (2) DE19529681C2 (fr)
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DE102007031759A1 (de) 2007-07-07 2009-01-08 Linde Ag Verfahren und Vorrichtung zur Erzeugung von gasförmigem Druckprodukt durch Tieftemperaturzerlegung von Luft
DE102007031765A1 (de) 2007-07-07 2009-01-08 Linde Ag Verfahren zur Tieftemperaturzerlegung von Luft
DE102009034979A1 (de) 2009-04-28 2010-11-04 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Erzeugung von gasförmigem Drucksauerstoff
EP2312248A1 (fr) 2009-10-07 2011-04-20 Linde Aktiengesellschaft Procédé et dispositif de production d'oxygène sous pression et de crypton/xénon
EP2458311A1 (fr) 2010-11-25 2012-05-30 Linde Aktiengesellschaft Procédé et dispositif de production d'un produit d'impression gazeux par décomposition à basse température d'air
DE102010052544A1 (de) 2010-11-25 2012-05-31 Linde Ag Verfahren zur Gewinnung eines gasförmigen Druckprodukts durch Tieftemperaturzerlegung von Luft
EP2520886A1 (fr) 2011-05-05 2012-11-07 Linde AG Procédé et dispositif de production d'un produit comprimé à oxygène gazeux par décomposition à basse température d'air
EP2568242A1 (fr) 2011-09-08 2013-03-13 Linde Aktiengesellschaft Procédé et dispositif destinés à la production d'acier
EP2600090A1 (fr) 2011-12-01 2013-06-05 Linde Aktiengesellschaft Procédé et dispositif destinés à la production d'oxygène sous pression par décomposition à basse température de l'air
DE102011121314A1 (de) 2011-12-16 2013-06-20 Linde Aktiengesellschaft Verfahren zur Erzeugung eines gasförmigen Sauerstoff-Druckprodukts durch Tieftemperaturzerlegung von Luft
DE102013017590A1 (de) 2013-10-22 2014-01-02 Linde Aktiengesellschaft Verfahren zur Gewinnung eines Krypton und Xenon enthaltenden Fluids und hierfür eingerichtete Luftzerlegungsanlage
DE102012017488A1 (de) 2012-09-04 2014-03-06 Linde Aktiengesellschaft Verfahren zur Erstellung einer Luftzerlegungsanlage, Luftzerlegungsanlage und zugehöriges Betriebsverfahren
EP2784420A1 (fr) 2013-03-26 2014-10-01 Linde Aktiengesellschaft Procédé de séparation de l'air et installation de séparation de l'air
WO2014154339A2 (fr) 2013-03-26 2014-10-02 Linde Aktiengesellschaft Procédé de séparation d'air et installation de séparation d'air
EP2801777A1 (fr) 2013-05-08 2014-11-12 Linde Aktiengesellschaft Installation de décomposition de l'air dotée d'un entraînement de compresseur principal
EP2963369A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif cryogeniques de separation d'air
EP2963370A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif cryogeniques de separation d'air
EP2963371A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif de production d'un produit de gaz sous pression par decomposition a basse temperature d'air
EP2963367A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procédé et dispositif cryogéniques de séparation d'air avec consommation d'énergie variable

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DE102012006484A1 (de) * 2012-03-29 2013-10-02 Linde Aktiengesellschaft Transportables Paket mit einer Coldbox und Verfahren zum Herstellen einer Tieftemperatur-Luftzerlegungsanlage
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DE102007031759A1 (de) 2007-07-07 2009-01-08 Linde Ag Verfahren und Vorrichtung zur Erzeugung von gasförmigem Druckprodukt durch Tieftemperaturzerlegung von Luft
DE102007031765A1 (de) 2007-07-07 2009-01-08 Linde Ag Verfahren zur Tieftemperaturzerlegung von Luft
EP2015013A2 (fr) 2007-07-07 2009-01-14 Linde Aktiengesellschaft Procédé et dispositif de production d'un gaz sous pression par séparation cryogénique d'air
EP2015012A2 (fr) 2007-07-07 2009-01-14 Linde Aktiengesellschaft Procédé pour la séparation cryogénique d'air
DE102009034979A1 (de) 2009-04-28 2010-11-04 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Erzeugung von gasförmigem Drucksauerstoff
EP2312248A1 (fr) 2009-10-07 2011-04-20 Linde Aktiengesellschaft Procédé et dispositif de production d'oxygène sous pression et de crypton/xénon
EP2458311A1 (fr) 2010-11-25 2012-05-30 Linde Aktiengesellschaft Procédé et dispositif de production d'un produit d'impression gazeux par décomposition à basse température d'air
DE102010052545A1 (de) 2010-11-25 2012-05-31 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung eines gasförmigen Druckprodukts durch Tieftemperaturzerlegung von Luft
DE102010052544A1 (de) 2010-11-25 2012-05-31 Linde Ag Verfahren zur Gewinnung eines gasförmigen Druckprodukts durch Tieftemperaturzerlegung von Luft
EP2466236A1 (fr) 2010-11-25 2012-06-20 Linde Aktiengesellschaft Procédé de production d'un produit d'impression gazeux par décomposition à basse température de l'air
EP2520886A1 (fr) 2011-05-05 2012-11-07 Linde AG Procédé et dispositif de production d'un produit comprimé à oxygène gazeux par décomposition à basse température d'air
DE102011112909A1 (de) 2011-09-08 2013-03-14 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung von Stahl
EP2568242A1 (fr) 2011-09-08 2013-03-13 Linde Aktiengesellschaft Procédé et dispositif destinés à la production d'acier
EP2600090A1 (fr) 2011-12-01 2013-06-05 Linde Aktiengesellschaft Procédé et dispositif destinés à la production d'oxygène sous pression par décomposition à basse température de l'air
DE102011121314A1 (de) 2011-12-16 2013-06-20 Linde Aktiengesellschaft Verfahren zur Erzeugung eines gasförmigen Sauerstoff-Druckprodukts durch Tieftemperaturzerlegung von Luft
DE102012017488A1 (de) 2012-09-04 2014-03-06 Linde Aktiengesellschaft Verfahren zur Erstellung einer Luftzerlegungsanlage, Luftzerlegungsanlage und zugehöriges Betriebsverfahren
EP2784420A1 (fr) 2013-03-26 2014-10-01 Linde Aktiengesellschaft Procédé de séparation de l'air et installation de séparation de l'air
WO2014154339A2 (fr) 2013-03-26 2014-10-02 Linde Aktiengesellschaft Procédé de séparation d'air et installation de séparation d'air
EP2801777A1 (fr) 2013-05-08 2014-11-12 Linde Aktiengesellschaft Installation de décomposition de l'air dotée d'un entraînement de compresseur principal
DE102013017590A1 (de) 2013-10-22 2014-01-02 Linde Aktiengesellschaft Verfahren zur Gewinnung eines Krypton und Xenon enthaltenden Fluids und hierfür eingerichtete Luftzerlegungsanlage
EP2963369A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif cryogeniques de separation d'air
EP2963370A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif cryogeniques de separation d'air
EP2963371A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif de production d'un produit de gaz sous pression par decomposition a basse temperature d'air
EP2963367A1 (fr) 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procédé et dispositif cryogéniques de séparation d'air avec consommation d'énergie variable
WO2016005031A1 (fr) 2014-07-05 2016-01-14 Linde Aktiengesellschaft Procédé et dispositif de fractionnement de l'air à basse température à consommation d'énergie variable

Also Published As

Publication number Publication date
DE19529681A1 (de) 1997-02-13
US5845517A (en) 1998-12-08
DK0758733T3 (da) 2001-01-15
DE19529681C2 (de) 1997-05-28
EP0758733A2 (fr) 1997-02-19
DE59606078D1 (de) 2000-12-07
EP0758733A3 (fr) 1997-07-30

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