EP3255366A1 - Procédé et dispositif de production d'un produit gazeux à base d'oxygène sous pression - Google Patents

Procédé et dispositif de production d'un produit gazeux à base d'oxygène sous pression Download PDF

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Publication number
EP3255366A1
EP3255366A1 EP16001298.5A EP16001298A EP3255366A1 EP 3255366 A1 EP3255366 A1 EP 3255366A1 EP 16001298 A EP16001298 A EP 16001298A EP 3255366 A1 EP3255366 A1 EP 3255366A1
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Prior art keywords
pressure
secondary condenser
condenser
air
nitrogen
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EP16001298.5A
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German (de)
English (en)
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Stefan Lochner
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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
    • F25J3/04151—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
    • F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest 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
    • F25J3/04006—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
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04181—Regenerating the adsorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
    • 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.
    • F25J3/04381—Details relating to the work expansion, e.g. process parameter etc. using work extraction by mechanical coupling of compression and expansion so-called companders
    • 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.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work 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
    • 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
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
    • F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
    • F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
    • 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
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04721—Producing pure argon, e.g. recovered from a crude argon 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/40—Air or oxygen enriched air, i.e. generally less than 30mol% of O2
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/40—One fluid being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/42—One fluid being nitrogen

Definitions

  • the invention relates to a method for producing a gaseous pressure oxygen product according to the preamble of patent claim 1.
  • the production of air products in the liquid or gaseous state by cryogenic separation of air in air separation plants is known.
  • Such air separation plants have distillation column systems which can be designed, for example, as two-column systems, in particular as classic Linde double-column systems, but also as three-column or multi-column systems.
  • devices for obtaining further air components in particular the noble gases krypton, xenon and / or argon, can be provided (cf., for example, FG Kerry, Industrial Gas Handbook: Gas Separation and Purification, Boca Raton: CRC Press, 2006, Chapter 3: Air Separation Technology).
  • the distillation column system of the invention may be designed as a classical double column system, but also as a three or more column system. It may have, in addition to the columns for nitrogen-oxygen separation, other devices for obtaining other air components, in particular noble gases, for example an argon recovery.
  • a “main heat exchanger” serves to cool feed air in indirect heat exchange with recycle streams from the distillation column system. It may be formed from a single or a plurality of parallel and / or serially connected and functionally connected heat exchanger sections, for example one or more plate heat exchanger blocks.
  • the term "condenser-evaporator” refers to a heat exchanger in which a first condensing fluid stream undergoes indirect heat exchange with a second evaporating fluid stream. Each condenser-evaporator has a liquefaction space and an evaporation space, which consist of liquefaction passages or evaporation passages.
  • the condensation (liquefaction) of the first fluid flow is performed, in the evaporation space the evaporation of the second fluid flow.
  • Evaporation and liquefaction space are formed by groups of passages that are in heat exchange relationship with each other.
  • the Evaporation space of a condenser-evaporator may be formed as a bath evaporator, falling film evaporator or forced-flow evaporator.
  • secondary condenser is meant a condenser-evaporator which is designed to be used exclusively for the indirect transfer of latent heat from a condensing process stream to an evaporating process stream against a second condensing process stream, and not or substantially not suitable for the transfer of sensible heat is. It is realized by a heat exchanger, which is formed separately from other heat exchangers, in particular a main heat exchanger or a subcooling countercurrent, both of which regularly serve exclusively or predominantly for the heat exchange of purely gaseous streams.
  • a secondary condenser is usually designed as a bath evaporator.
  • the first partial flow of air also called throttle flow, introduced into the evaporation space of the secondary condenser.
  • a system for generating significant amounts of liquid oxygen and liquid nitrogen has a high pre-liquefaction of the air, which makes the separation difficult.
  • the secondary condenser serves to reduce this pre-liquefaction - in contrast to the more widespread use of secondary condensers for the evaporation of impure oxygen.
  • air is evaporated in the secondary condenser against condensing nitrogen. The conversion of liquid air to liquid nitrogen reduces pre-liquefaction, thereby improving the separation efficiency of the system.
  • the invention is therefore based on the object to improve the method of the type mentioned and a corresponding device to the effect that very little energy is consumed, especially if the sum of the liquid nitrogen product and the gaseous pressure nitrogen product (via internal compression and / or directly from the High pressure column) is greater than the sum the liquid oxygen product and the gaseous pressure oxygen product (via internal compression). (The above comparison refers to the molar amounts per unit time.)
  • the liquefaction space of the secondary condenser is fed in the invention not with high-pressure column nitrogen, but with a nitrogen fraction higher pressure.
  • a higher pressure can be driven on the air side - for example, slightly above the operating pressure of the high pressure column.
  • the vaporized air does not have to be recompressed as in the prior art, but can be introduced directly into the high-pressure column without further use of energy and fed to the separation.
  • the nitrogen for the secondary condenser comes from the low-pressure column instead of the high-pressure column and is then under high-pressure column pressure.
  • the liquid nitrogen produced in the secondary condenser can also be used in the high-pressure column as reflux.
  • the invention thus has a kind of amplification circuit which improves the efficiency of the separation.
  • the booster driven by the first expansion machine may be the front or the rear of the two booster (in the flow direction).
  • first and the second partial flow together or even the total feed air in the two serially connected after-compressors can be recompressed to the second pressure.
  • That of the serially connected after-compressor which is not driven by the first expansion machine can be driven by a second expansion machine.
  • a gaseous air stream from the evaporation space of the secondary condenser in the main heat exchanger is heated to a second intermediate temperature, which is preferably higher than the first intermediate temperature.
  • the gaseous air flow under the second Intermediate temperature is then fed to the second expansion machine and there relaxes work.
  • the relaxed in the second expansion machine air flow is preferably heated in the main heat exchanger and can be used as a regeneration gas in the cleaning device.
  • air as a regeneration gas
  • the low-pressure column can be driven at particularly low pressure, thereby saving energy during air compression.
  • the purifier is regenerated in a conventional manner with impure nitrogen from the low pressure column.
  • the second partial flow in the first expansion machine is expanded to approximately the pressure in the evaporation space of the auxiliary condenser and then introduced into the evaporation space of the secondary condenser.
  • the secondary condenser can be used as a separator (phase separator) to separate liquid droplets present in the expanded second partial flow.
  • a part of the second partial flow can also be introduced directly into the high-pressure column.
  • the liquefied in the liquefaction space of the secondary condenser nitrogen is introduced into the high-pressure column and serves as reflux for the distillation.
  • the liquid remaining air from the evaporation space of the secondary condenser or a part thereof is fed to the high-pressure column at an intermediate point. It is usually more useful here than if it were completely introduced into the low-pressure column. In particular, it can be divided between low-pressure column and high-pressure column.
  • this liquid air can be partially or completely subcooled in the subcooling countercurrent and introduced into the low pressure column as intermediate reflux.
  • the invention also relates to a device according to claim 14.
  • the device according to the invention can be supplemented by device features which correspond to the characteristics of individual, several or all dependent method claims.
  • the liquid oxygen product is preferably taken from the bottom of the low-pressure column, the liquid nitrogen product from the top of the high-pressure column or from the liquefaction space of the main condenser.
  • the total feed air (AIR) is compressed via a filter 1 from a main air compressor 2 with aftercooling 3 (and unillustrated intermediate cooling) to a "first pressure" of 23 bar.
  • the subsequent pre-cooling system has an optional cooling by a refrigeration system 4 and a water separator 6. Alternatively, all known types of pre-cooling systems are possible, for example with direct contact cooler.
  • the pre-cooled feed air 7 is fed to a cleaning device 8, preferably a switchable molecular sieve adsorber.
  • the purified air 9 is recompressed in two serial booster compressors 10, 12 with aftercoolers 11, 13 to a "second pressure" of 36 bar.
  • the entire feed air is subjected to the re-compaction. (This does not exclude that smaller parts of the air under the first or the second pressure can be diverted as instrument air.)
  • parts of the air under the first or the second pressure as second or third throttle flow can be used (in the Drawing not shown).
  • the air 14 comprises both the "first partial flow”, the throttle flow, and the "second partial flow", the air flow for the cold turbine. It is fed to the main heat exchanger 30 at its warm end.
  • the first partial flow 15 is led to the cold end and then expanded to a pressure of 5.7 bar, here in a throttle valve 16. Subsequently, it is introduced into the evaporation space of the secondary condenser 17.
  • the secondary condenser is designed in the embodiment as a bath evaporator
  • Gaseous air 18 from the secondary condenser 17 is introduced to a first part as gaseous feed air 19 in the high-pressure column 20.
  • the high-pressure column 20 is part of a distillation column system, which also has the secondary condenser 17, the main condenser 22 and the low-pressure column 21. Liquid remaining air 23 from the secondary condenser is fed to the high-pressure column 20 at an intermediate point.
  • the second partial flow 24 is withdrawn at a first intermediate temperature of 160 K from the main heat exchanger 30 and flows to a first expansion machine 25, which is designed as an expansion turbine. There, the second partial flow is released from the second pressure to the pressure in the evaporation space of the secondary condenser 17.
  • the secondary capacitor 17 is additionally used here as a separator to separate a very small proportion of liquid at the outlet from the work-performing expansion 25.
  • a second part 26 of the gaseous air 18 from the secondary condenser 17 is supplied to the main heat exchanger 30 at the cold end and reheated there to a second intermediate temperature of 267 K.
  • the warmed-up air stream 27 enters a second expansion machine (expansion turbine) 28 and is there discharged to slightly above atmospheric pressure, in particular to about 1.2 bar.
  • the warm low-pressure air 31 is supplied via line 32 as a regeneration of the cleaning device 8, optionally after heating in a Regeneriergaserhitzer 33, and then blown off via line 34 into the atmosphere (ATM). Alternatively, a part or all is blown off via line 35.
  • liquid crude oxygen via a supercooling countercurrent 37 and the lines 38 and 39 is introduced into the low pressure column 21.
  • a classical argon recovery 70 is provided with crude argon column 71 for obtaining liquid argon LAR, at least a part is passed over the argon condenser 72 and finally passed via lines 40 and 41 to the low pressure column.
  • a portion of the liquid air, which was introduced via line 23 into the high-pressure column 20, is removed again via line 42, cooled in the subcooling countercurrent 37 and fed via line 43 into the low-pressure column.
  • the gaseous top nitrogen 44 of the high pressure column 20 is almost completely condensed to a first part 45 in the main condenser 22 against vaporizing bottom oxygen of the low pressure column 21.
  • the liquid nitrogen 46 obtained in the process is fed to a first part 47 on the top of the high-pressure column 20.
  • the remainder 48 is subcooled in the subcooling countercurrent 37 and passed via line 49 to the top of the low pressure column 21. There it is either added to the top of the low-pressure column (50) or withdrawn as liquid nitrogen product LIN.
  • the remainder 54 of the gaseous top nitrogen 44 of the high-pressure column 20 is warmed in the main heat exchanger 30 and discharged via line 55 as gaseous pressurized nitrogen product PGAN.
  • Liquid oxygen 51 from the bottom of the low-pressure column is optionally subcooled in the subcooling countercurrent 37 and finally recovered as a liquid oxygen product LOX.
  • Gaseous impurity nitrogen 52 from the low pressure column 21 is heated in the subcooling countercurrent 37 and in the main heat exchanger 30.
  • the warm impure nitrogen 53 is released as a residual WASTE.
  • the gaseous nitrogen 56 from the top of the low pressure column 21 is also heated in subcooling countercurrent 37 and main heat exchanger 30 to about ambient temperature.
  • only part of the warm low-pressure nitrogen 57 is released as a low-pressure product GAN; the remainder 58 is brought to a condensation pressure of 7.9 bar in a nitrogen compressor 59 with aftercooler 60.
  • the compressed nitrogen 61 is in Main heat exchanger 30 is cooled again and introduced via line 62 into the liquefaction space of the secondary condenser 17.
  • the liquid nitrogen 63 obtained in the secondary condenser 17 is fed to the top of the high-pressure column 20.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP16001298.5A 2016-06-09 2016-06-09 Procédé et dispositif de production d'un produit gazeux à base d'oxygène sous pression Withdrawn EP3255366A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16001298.5A EP3255366A1 (fr) 2016-06-09 2016-06-09 Procédé et dispositif de production d'un produit gazeux à base d'oxygène sous pression

Applications Claiming Priority (1)

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EP16001298.5A EP3255366A1 (fr) 2016-06-09 2016-06-09 Procédé et dispositif de production d'un produit gazeux à base d'oxygène sous pression

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023030689A1 (fr) * 2021-09-02 2023-03-09 Linde Gmbh Procédé pour obtenir un ou plusieurs produits de l'air et installation de séparation d'air

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228297A (en) * 1992-04-22 1993-07-20 Praxair Technology, Inc. Cryogenic rectification system with dual heat pump
EP0684437A1 (fr) * 1994-05-27 1995-11-29 The BOC Group plc Séparation d'air
US5660059A (en) 1995-07-06 1997-08-26 The Boc Group Plc Air separation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228297A (en) * 1992-04-22 1993-07-20 Praxair Technology, Inc. Cryogenic rectification system with dual heat pump
EP0684437A1 (fr) * 1994-05-27 1995-11-29 The BOC Group plc Séparation d'air
US5660059A (en) 1995-07-06 1997-08-26 The Boc Group Plc Air separation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
F.G. KERRY: "Industrial Gas Handbook: Gas Separation and Purification", 2006, CRC PRESS, article "Air Separation Technology"

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023030689A1 (fr) * 2021-09-02 2023-03-09 Linde Gmbh Procédé pour obtenir un ou plusieurs produits de l'air et installation de séparation d'air

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