EP2458311A1 - Procédé et dispositif de production d'un produit d'impression gazeux par décomposition à basse température d'air - Google Patents

Procédé et dispositif de production d'un produit d'impression gazeux par décomposition à basse température d'air Download PDF

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Publication number
EP2458311A1
EP2458311A1 EP10015788A EP10015788A EP2458311A1 EP 2458311 A1 EP2458311 A1 EP 2458311A1 EP 10015788 A EP10015788 A EP 10015788A EP 10015788 A EP10015788 A EP 10015788A EP 2458311 A1 EP2458311 A1 EP 2458311A1
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EP
European Patent Office
Prior art keywords
pressure
compressor
partial flow
air
warm
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.)
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EP10015788A
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German (de)
English (en)
Inventor
Alexander Dr. Alekseev
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Linde GmbH
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Linde GmbH
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Publication of EP2458311A1 publication Critical patent/EP2458311A1/fr
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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
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of 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
    • F25J3/04078—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
    • F25J3/04084—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 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
    • F25J3/04151—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
    • F25J3/042—Division of the main heat exchange line in consecutive sections having different functions having an intermediate feed connection
    • 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
    • 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
    • F25J3/04284—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
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low 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
    • F25J3/04339—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 air
    • F25J3/04345—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 air 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
    • F25J3/04248—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
    • 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

Definitions

  • the invention relates to a method for obtaining a gaseous printed product by cryogenic separation of air according to the preamble of patent claim 1.
  • the distillation column system of the invention can be designed as a two-column system (for example as a classic Linde double column system), or as a three-column or multi-column system. It may in addition to the columns for nitrogen-oxygen separation, further devices for obtaining high purity products and / or other air components, in particular of noble gases, for example, an argon production and / or a krypton-xenon recovery.
  • a liquid pressurized oxygen product stream is vaporized against a heat carrier and finally recovered as a gaseous pressure product.
  • This method is also called internal compression. It serves for the production of pressure oxygen. In the case of a supercritical pressure, no phase transition takes place in the true sense, the product stream is then "pseudo-evaporated".
  • a high-pressure heat carrier is liquefied (or pseudo-liquefied when it is under supercritical pressure).
  • the heat transfer medium is often formed by part of the air, in the present case by the "second partial flow" of the compressed feed air.
  • EP 1139046 A1 EP 1146301 A1 .
  • expansion machine includes any machine for work-relaxing a process stream.
  • the expansion machines are formed in the invention by expansion turbines.
  • the "main heat exchanger” may be formed of one or more parallel and / or serially connected heat exchanger sections, for example one or more plate heat exchanger blocks. It serves to cool the feed air streams in indirect heat exchange with return streams from the distillation column system.
  • the invention is therefore based on the object to provide a method of the type mentioned above and a corresponding device, which are economically particularly favorable to operate.
  • At least a portion of the air from the second expansion machine (third partial flow) is not discarded, but used in the rectification, more precisely in the low pressure column.
  • the yield of the system is increased and the already put into the third partial flow cleaning effort is not lost;
  • the second expansion machine can still be operated with a particularly low outlet pressure, ie with relatively high power.
  • the outlet pressure of the second expansion machine is approximately equal to the operating pressure of the low-pressure column (plus line losses).
  • it may be higher than the low pressure column pressure, but this would be associated with energy losses and may only be useful in special circumstances.
  • the entire third partial flow can be performed in the low-pressure column.
  • at least 30%, in particular at least 50%, of the work-performing expanded third partial stream are introduced into the low-pressure column.
  • third partial flow here refers to the entire air flow guided through the second expansion machine.
  • the rest of the working part of the relaxed third partial stream or a part thereof can be returned to the air compressor.
  • it is fed to the air compressor at the inlet or at an intermediate stage, usually at the inlet.
  • a part of the work-performing expanded third partial flow is discharged into the atmosphere. This may be useful, in particular, when the outlet pressure of the second expansion machine is at the level of the low-pressure column pressure.
  • the total feed air can be compressed together in the warm after-compressor, ie in particular the first, the second and the third partial flow.
  • Air ducts possibly diverted for other purposes, so-called instrument air, are not counted here as "total feed air”.
  • the diversion of the third partial flow from other air parts then takes place downstream of the warm after-compressor. This procedure is particularly useful for serial connection of the turbines, but can also be used in parallel connection.
  • the first and the second partial flow are recompressed in the warm after-compressor, and the third partial flow is conducted past the warm after-compressor.
  • the diversion of the third partial flow of other air parts takes place here upstream of the warm after-compressor.
  • the second partial flow is recompressed in the warm after-compressor, and the first and the third partial flow are conducted past the warm after-compressor.
  • the diversion of the third partial flow of other parts of the air also takes place here upstream of the warm after-compressor or downstream of the common branch of the first and third partial flow from the purified, but not recompressed feed air flow.
  • the third partial flow is introduced into the second expansion machine at approximately the outlet pressure of the air compressor or below approximately the outlet pressure of the warm after-compressor.
  • the splitting into the first and third partial flow takes place upstream of the work-performing depressions.
  • the two relaxation machines are connected in parallel.
  • the third partial flow is expanded together with the first partial flow in the first expansion machine and fed downstream of the first expansion machine separately from the first partial flow of the second expansion machine.
  • the splitting into the first and third partial flow is therefore carried out only upstream of the first expansion machine.
  • the two expansion machines are connected in series.
  • the air compressor is the only external energy driven machine for compressing air.
  • a single machine is meant here a single stage or multi-stage compressor whose stages are all connected to the same drive, all stages in the same Housing housed or connected to the same gear.
  • the entire feed air is compressed to a pressure which is significantly above the highest pressure of the distillation column system, in particular significantly above the operating pressure of the high-pressure column.
  • This pressure difference between the outlet pressure of the air compressor and the operating pressure of the high-pressure column is, for example, at least 4 bar and is preferably between 6 and 16 bar.
  • the compressed in the air compressor total air (except for possible smaller proportions such as instrument air) is preferably completely divided among the three sub-streams.
  • a nitrogen internal compression can be supplemented by removing a liquid nitrogen product stream from the distillation column system, brought to elevated pressure in the liquid state, vaporized or pseudo-evaporated under this elevated pressure in the main heat exchanger, warmed to about ambient temperature and finally withdrawn as a gaseous nitrogen pressure product stream.
  • the invention also relates to a device according to claim 12.
  • the device according to the invention can be supplemented by the following features, which can be applied individually independently of each other or in any combination.
  • the distillation column system is designed as a classic Linde double column system in which the low-pressure column 90 and the high-pressure column 80 are arranged one above the other and are in heat exchanging connection via a main condenser.
  • the first and the third partial flow 11, 13 are here jointly led by the outlet of the cleaning device 5 via line 10 to the warm end of the main heat exchanger 14.
  • a liquid oxygen product stream 30 is withdrawn from the low pressure column 90, pressurized (52) in a liquid state pump (52), vaporized under this elevated pressure in the main heat exchanger or, if the pressure is higher than the critical pressure, pseudo-liquid. evaporated, warmed to about ambient temperature and finally withdrawn as a gaseous oxygen pressure product stream 33.
  • a nitrogen-pressure product can also be obtained by means of internal compression.
  • a liquid nitrogen product stream from the high-pressure column or its top condenser, the main condenser is brought in a pump in the liquid state to an elevated pressure, evaporated under this increased pressure in the main heat exchanger or, if the pressure is higher than the critical pressure, pseudo -Vaporized, warmed to about ambient temperature and finally withdrawn as a gaseous nitrogen pressure product stream.
  • the second partial flow 7 can be precooled upstream of the hot secondary compressor 8.
  • the aftercooler may then be omitted under certain circumstances.
  • FIG. 2 differs from FIG. 1 exclusively in that the third partial flow 13 upstream of the second expansion machine 25 is not cooled in the main heat exchanger 14, but is led directly below approximately ambient temperature for work-performing expansion. Accordingly, the exit temperature of the expansion machine 25 is greater and line 28 is therefore introduced at a higher intermediate temperature in the main heat exchanger as-stream 20 from the cold compressor 19th
  • FIG. 3 differs from FIG. 1 solely in that the remainder 28 of the work-performing expanded third partial stream 26, which does not pass via line 27 into the low-pressure column 90, is not supplied to the air compressor, but is discharged via line 329 into the atmosphere.
  • FIG. 4 differs from FIG. 1 exclusively in that not only the second partial flow 12, but also the first partial flow 11 in the warm secondary compressor 8 is recompressed.
  • the third partial stream 413 is branched off directly downstream of the cleaning device 5.
  • FIGS. 2 to 4 can be combined with one another as desired.
  • the common recompression of the first and the second partial flow according to FIG. 4 also in the method according to Figures 2 and 3 be applied.
  • FIG. 5 corresponds largely to a combination of FIG. 2 (Blowing the remainder 28, 329 of the working expanded third partial stream 26 into the atmosphere; alternatively, the stream 329 could also be analogous to FIG. 1 be led to the air compressor) with the FIG. 4 (common warm re-compression of the first partial flow 11 and the second partial flow 413), however, are in FIG. 5 the two expansion machines 16, 525 not parallel, but connected in series.
  • the first and the third partial flow are here jointly (lines 510 and 515) of the first expansion machine 16 fed.
  • the work-relaxing relaxed common flow 516 is in the Example introduced into the high-pressure column 80, wherein the first partial flow ascends as steam in the interior of the high-pressure column.
  • the third partial flow 513 is removed again directly at the feed point. (Equivalently, the division between the first and third partial streams could also be carried out upstream of the high-pressure column 80, the third partial stream would then be conducted past the high-pressure column 80.
  • FIG. 6 represents a modification of the FIG. 5 Here is - analogous to FIG. 1 - Only the second partial flow 12 in the warm booster 8 nachverêtt. The first and the third partial flow are passed together via line 610 to the secondary compressor 8.

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  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP10015788A 2010-11-25 2010-12-17 Procédé et dispositif de production d'un produit d'impression gazeux par décomposition à basse température d'air Withdrawn EP2458311A1 (fr)

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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
DE102014019612A1 (de) 2014-12-30 2015-04-02 Linde Aktiengesellschaft Verfahren und Anlage zur Tieftemperaturzerlegung von Luft
DE102013019504A1 (de) 2013-11-21 2015-05-21 Linde Aktiengesellschaft Verfahren zur Gewinnung eines flüssigen Stickstoffprodukts durch Tieftemperaturzerlegung von Luft und Luftzerlegungsanlage
EP2963369A1 (fr) * 2014-07-05 2016-01-06 Linde Aktiengesellschaft Procede et dispositif cryogeniques de separation d'air
EP2980514A1 (fr) 2014-07-31 2016-02-03 Linde Aktiengesellschaft Procédé de séparation cryogénique de l'air et installation de séparation d'air
EP3101374A2 (fr) 2015-06-03 2016-12-07 Linde Aktiengesellschaft Procede et installation cryogeniques de separation d'air
EP3196573A1 (fr) 2016-01-21 2017-07-26 Linde Aktiengesellschaft Procede de production d'un produit pneumatique et installation de decomposition d'air
WO2019081065A1 (fr) 2017-10-24 2019-05-02 Linde Aktiengesellschaft Procédé et appareil de traitement d'un mélange de gaz acides
WO2019120619A1 (fr) 2017-12-19 2019-06-27 Linde Aktiengesellschaft Procédé de traitement de gaz comprenant un processus oxydatif fournissant de la chaleur perdue et appareil correspondant
WO2020160842A1 (fr) 2019-02-07 2020-08-13 Linde Gmbh Procédé et appareil de traitement de gaz comprenant un processus oxydatif pour traiter un mélange de gaz acides à l'aide de gaz provenant d'un processus de séparation d'air
US10794630B2 (en) 2017-08-03 2020-10-06 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for separating air by cryogenic distillation

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TR201808162T4 (tr) 2014-07-05 2018-07-23 Linde Ag Havanın düşük sıcaklıkta ayrıştırılması vasıtasıyla bir basınçlı gaz ürününün kazanılmasına yönelik yöntem ve cihaz.
US20210348839A1 (en) * 2020-05-05 2021-11-11 Jeremiah J. Rauch System and method for cryogenic air separation using a booster loaded liquid turbine for expansion of a liquid air stream

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