EP2211131A1 - Procédé destiné au fonctionnement d'une installation de séparation de l'air - Google Patents

Procédé destiné au fonctionnement d'une installation de séparation de l'air Download PDF

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Publication number
EP2211131A1
EP2211131A1 EP09151023A EP09151023A EP2211131A1 EP 2211131 A1 EP2211131 A1 EP 2211131A1 EP 09151023 A EP09151023 A EP 09151023A EP 09151023 A EP09151023 A EP 09151023A EP 2211131 A1 EP2211131 A1 EP 2211131A1
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EP
European Patent Office
Prior art keywords
product
oxygen
air
air separation
line
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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Application number
EP09151023A
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German (de)
English (en)
Inventor
Dirk Jusczyk
Witold Balczarczyk
Lothar Frohne
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Linde GmbH
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Linde GmbH
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Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP09151023A priority Critical patent/EP2211131A1/fr
Publication of EP2211131A1 publication Critical patent/EP2211131A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04642—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
    • F25J3/04727—Producing pure argon, e.g. recovered from a crude argon column using an auxiliary pure argon column for nitrogen rejection
    • 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
    • F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • 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
    • F25J3/04406—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
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/90—Mixing of components
    • 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
    • F25J2215/02—Mixing or blending of fluids to yield a certain product
    • 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
    • F25J2215/50—Oxygen or special cases, e.g. isotope-mixtures or low purity O2
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/58—Processes or apparatus involving steps for recycling of process streams the recycled stream being argon or crude argon

Definitions

  • the present invention relates to a method for operating an air separation plant and a device having an air separation plant for providing an oxygen product with a predetermined oxygen concentration.
  • blast furnaces are usually operated with oxygen-enriched air to ensure a more efficient oxidation and reduction reaction.
  • air separation plants were built near the blast furnace facilities to provide suitable oxygen-enriched air for the blast furnace process.
  • Modern air separation plants usually provide, especially if air components such as argon are rectified, highly pure oxygen products of a molar content of over 99% oxygen ready. For most industrial applications, however, no correspondingly high purity oxygen is used, for example in combustion processes. The provision of such an excess oxygen product by the air separation plant may therefore be inefficient.
  • a method for operating an air separation plant, the air separation plant providing a high purity oxygen product having a predetermined oxygen content and at least one further air separation product.
  • a pretreatment and supply of ambient air in an air separation process of the air separation plant takes place as pressurized process air.
  • the high purity oxygen product is mixed with the process air to form a supply oxygen product having a predetermined oxygen content.
  • ASU Air Separation Units
  • the high-purity nitrogen extracted from an air separation plant usually has only 1 ppm (parts per million) oxygen content.
  • the pretreatment and supply of ambient air as pressurized process air often includes the filtering of ambient air, compressing this filtered ambient air and in particular the cleaning and cooling z.
  • the process air is substantially free of dust particles, furthermore, sulfur oxides and ammonia are washed out and any hydrocarbons present in the ambient air and CO 2 are removed from the air, for example, by molecular sieve absorbers.
  • the air separation process carried out in the air separation plant is usually based on the Linde process, can be performed by a Zweiklaklaapparat and preferably takes place according to the principle of internal compression.
  • the further air separation product such as a nitrogen product
  • a nitrogen product can be easily removed from the rectification cycle of the air separation plant. Since in particular nitrogen is present in a particularly pure degree (with only 1 ppm oxygen content), a particularly precise adjustment of the oxygen content for the delivery oxygen product is possible.
  • a particularly well-defined delivery oxygen product can be achieved for the customer.
  • a noble gas product such as argon
  • argon is used as a further air separation product. If oxidation or combustion processes are operated with the delivery oxygen product of the predetermined oxygen concentration, the generation of harmful nitrogen oxides can practically be prevented by mixing the high-purity or excess oxygen product from the air separation process with argon.
  • An apparatus for providing a delivery oxygen product having a predetermined oxygen content comprises an air separation plant which provides a high purity oxygen product having a predetermined oxygen content and at least one further air separation product. It is an air cleaning and drying device for providing pretreated process air and a mixing device for mixing the high-purity oxygen product with the process air and / or the further air separation product to a Delivery oxygen product provided with a predetermined oxygen content.
  • a corresponding device is particularly suitable for carrying out one of the methods described above for operating an air separation plant.
  • the device may, for. B. have a control center device for controlling the air separation plant and the mixing device, wherein the control center device is set up such that a method, as explained above, is performed.
  • the air separation process of the air separation apparatus contemplated herein provides a high purity oxygen product, that is, at least 99% oxygen content.
  • a high purity oxygen product that is, at least 99% oxygen content.
  • simple, usually one-column rectification plants are used. It is then also necessary, in order to obtain a delivery oxygen product with suitable oxygen content, to mix further, for example in gas cylinders, oxygen medium-purity process product. So far, no delivery products are considered with an oxygen content between 90% and 99%.
  • the supply oxygen product has an oxygen content of 98.5%.
  • the oxygen product with 98.5% is particularly suitable for use in glass engineering plants.
  • the oxygen content of the delivery oxygen product is between 99% and 99.5%.
  • the high purity oxygen product preferably has an oxygen content of 99.8%.
  • a computer program product which causes the implementation of a corresponding method for operating an air separation plant on a program-controlled computer or control device.
  • a program-controlled computer or control device is for example a PC or a computer of a control room for the control and regulation of plants, in particular air separation plants in question, is installed on the appropriate software.
  • the computer program product may, for example, be implemented in the manner of a data carrier, such as a USB stick, floppy disk, CD-ROM, DVD, or else be implemented on a server device as a downloadable program file.
  • the device 1 comprises an air separation plant 2, which rectifies ambient air or subjects it to countercurrent distillation.
  • an air separation plant 2 comprises an air cleaning and drying device 3, which is supplied with ambient air via an ambient air line 6.
  • the air purification and drying device 3 filters dust particles and other disturbing for the air separation process components such as nitrogen or sulfur oxides and hydrocarbons from the ambient air and cools them off.
  • the thus pretreated ambient air is supplied as process air to a process air line 7, which in an air separation process, in the Fig. 1 designated by the reference numeral 4, and can be implemented by a code box.
  • An air separation process if properly implemented, will then supply a high purity oxygen product to an oxygen line 9, a high purity nitrogen product to a nitrogen line 10, and, with a suitable design of the code box, further argon to an argon line 11.
  • a suitable design of the code box further argon to an argon line 11.
  • At the air purification and drying device 3 will become more Process air tapped and provided on a process air line 8.
  • the ultrahigh-purity oxygen which is tapped on the oxygen line 9 is not necessary or undesirable.
  • commercial air separation plants that also have an argon cycle provide an oxygen product with 99.8% oxygen content.
  • a mixing device 5 is provided, which via the oxygen line 9, the high-purity oxygen product of 99.8% oxygen and the pretreated via the process air line 8, ie purified and dried process air, which is also suitable for the actual air separation supplied.
  • a delivery oxygen product is now produced by "diluting" the high-purity oxygen product from the line 9 with the process air from the line 8, which has the desired oxygen concentration of, for example, 98.5% oxygen.
  • This delivery oxygen product is provided to an output line 12 the actual customer.
  • a control center computer 100 which controls the components of the air separation plant 2 and the mixing device 5 via suitable control signals CT1, CT2 such that the desired quantities and flows of the high-purity oxygen product and the process air with each other are mixed and present as delivery oxygen product on the output line 12.
  • the apparatus 101 in turn comprises an air separation plant 2 which is adapted to accept ambient air from a raw air conduit 6 and to supply a high purity nitrogen product to a nitrogen conduit 10 via an air separation process, such as a Linde internal compression process, to an oxygen conduit 9 supply and on an argon line 11 to deliver an argon product.
  • an air separation plant 2 which is adapted to accept ambient air from a raw air conduit 6 and to supply a high purity nitrogen product to a nitrogen conduit 10 via an air separation process, such as a Linde internal compression process, to an oxygen conduit 9 supply and on an argon line 11 to deliver an argon product.
  • a portion of the nitrogen of the line 13 is branched off and fed to a mixing device 5.
  • the mixing device 5 is further supplied to the high-purity oxygen product through the line 9.
  • the nitrogen product on line 14 is retrievable.
  • the mixer 5 mixes the high purity oxygen product of the conduit 9 with the high purity nitrogen product of the conduit 13 to provide a desired delivery oxygen product having the oxygen concentration or a desired oxygen content of, for example, 98.5% at the discharge conduit 12.
  • a desired delivery oxygen product having the oxygen concentration or a desired oxygen content of, for example, 98.5% at the discharge conduit 12.
  • only the nitrogen product of the line 13 is mixed with the oxygen product of the line 9.
  • a third variant of a device for providing an oxygen product with a predetermined oxygen content is shown schematically.
  • the device 102 points, as already to the Fig. 1 and 2 explains, an air separation plant 2, which is supplied via a raw air line 6 ambient air.
  • the air separation plant 2 supplies an oxygen line 9 with a high-purity oxygen product, for example with an oxygen content of 99.8%.
  • a nitrogen line 10 a nitrogen product with, for example, only 1ppm oxygen can be tapped off, and on an argon line 11, liquid argon is supplied with only 1 ppm oxygen or 1 ppm nitrogen.
  • the mixing device 5 is fed via the branched argon line 15 to an argon product, ie a noble gas, and via the oxygen line 9 the high-purity oxygen product.
  • the high purity oxygen product is diluted with the argon product and provided at the delivery conduit 12 as a delivery oxygen product for the customer.
  • the delivery oxygen product then has, for example, a composition of 98.5% oxygen and 1.5% argon.
  • the high-purity oxygen product can be mixed with the further decomposition products in any desired composition.
  • the purity of the delivery oxygen product can be adapted to the requirements of the customer, which is different for example in refineries, blast furnaces, glass industry or natural gas burners.
  • FIG. 4 is a schematic representation of an air separation plant shown with a first variant of a mixing device for providing an oxygen product with a predetermined oxygen content.
  • the Fig. 4 shows a device 103 with typical elements of an air separation plant, which is particularly suitable for cryogenic argon production.
  • the plant or apparatus 103 essentially comprises a sucked ambient air cooling and washing means 20, molecular sieve absorbers 22 for purifying the cooled and prefiltered air, a main heat exchanger 28, the cold box 29 having a two-part column or rectification column 31 and optionally an argon circuit 30 for Argonrektbericht with corresponding columns 32, 33, 34.
  • the actual air separation plant deliver on an oxygen line 9, the high purity oxygen product with a concentration of 99.8% gaseous oxygen (GOX) and on a nitrogen line 10 high purity gaseous nitrogen (GAN) with a share of only 1ppm oxygen.
  • GOX gaseous oxygen
  • GAN high purity gaseous nitrogen
  • LOX high purity liquid oxygen
  • LIN liquid nitrogen
  • LAR liquid argon product
  • the cleaning system may include, for example, evaporative coolers operated with water.
  • the thus pre-cooled air is supplied via the air line 21 to a molecular sieve absorber 22 in order to achieve ultrafine drying and to remove carbon dioxide and hydrocarbon traces in the air.
  • the process air is conveyed via line 25, compressed in another compressor 26 and the line 27 the Main heat exchanger 28 supplied.
  • the rectification of the air is carried out in pure nitrogen, which is present at the top of the respective column, and there is oxygen-enriched fluid at the bottom of the column.
  • the reflux for the rectification is effected by condensation of the gaseous nitrogen in the column at the boiling oxygen in the Kondesor undergraduategang between the lower pressure column and the upper low-pressure column. A portion of the liquid nitrogen is used as reflux to the pressure column and the remainder is subcooled and fed to the top of the low pressure column.
  • the air separation plants as they are in the Fig. 4 are constructed in the vicinity of other industrial plants, which in particular require a special oxygen product.
  • a special oxygen product For example, for certain gas burners in the glass industry, supply oxygen products are needed at 98.5%.
  • the standard air separation unit on the oxygen product line 9 supplies an excessively pure oxygen product.
  • the high-purity oxygen product is present, for example, at a pressure of 1.15 bar.
  • a mixing device is provided in order to supply at a discharge line 49 a starting or delivery oxygen product having a desired oxygen concentration at, for example, an output pressure of 7.0 bar.
  • the process air is tapped behind the molecular sieve adsorber 22 via the branch process air line 38.
  • the process air which is also referred to as control or instrument air, is present at a pressure of about 4.5 - 5.2 bar and is supplied to the control valve 39.
  • the oxygen line 9 splits into two sub-lines 41, 42.
  • the line 42 is fed to a compressor or turbine 46, which brings the oxygen product to a discharge pressure of 7.0 bar.
  • the oxygen line 41 is guided into a mixing chamber 43, which is also connected via the line 40 to the control valve 39.
  • the mixing chamber 43 provides via the conduit 44 the high purity pilot or process blended oxygen product to the compressor 45 of the conduit 47 which provides the blended oxygen product.
  • the lines 47, 48 lead to the common output line 49. It is thus possible, by controlling or regulating the control valve 39, for example via the control center control, not shown, to intersect the over-pure oxygen product of the line 9 with already pressurized process air to the desired output concentration to achieve the delivery oxygen product with oxygen.
  • the system compared to conventional configurations more efficient, since the blending with process air more product on the delivery line 49 are available.
  • the desired concentration of oxygen is already present for further use, for example for gas burners. Due to the fact that the process air is already available at 4.5 bar for the decomposition process, mixing in the mixing chamber is particularly easy.
  • additional control valves for example in the oxygen line 41, can be provided.
  • a section of an air separation plant is shown with a second variant of a mixing device for providing an oxygen product with a predetermined oxygen content.
  • the main heat exchanger 28 and the cold box 29 is shown.
  • the main heat exchanger 28 is supplied through the control air line 23, 27, the air to be processed and then subjected in the cold box 29 with the rectification column 31 an air separation process. In essence, the same process steps as in terms of Fig. 4 explained.
  • a super-clean oxygen product can be tapped off and on a nitrogen line 10 high-purity nitrogen product.
  • the oxygen line 9 is first split into partial branches 51, 52, 53.
  • the oxygen lines 52, 53 are respectively supplied to compressors 56, 57, which lead via further oxygen lines 58, 59 to a common output line 61.
  • High purity nitrogen which is also frequently vented to the atmosphere, is subjected to compression by the compressor 50 and fed to a control valve 39.
  • the oxygen branch 51 and the compressed nitrogen product are fed to a mixing chamber 54, wherein the respective gas stream is adjusted depending on the desired oxygen concentration in the delivery oxygen product.
  • the oxygen product blended with the nitrogen in the mixing chamber 54 is supplied to a compressor 55 which is connected to the common discharge pipe 61 via an output pipe 60. At the output line 61 is now the blended with nitrogen high purity oxygen product in a concentration, as it is desired for further processing.
  • the high-purity oxygen at the line 9 as well as the high-purity nitrogen at the nitrogen line 10 are usually at a pressure of 1.15 bar. Therefore, a compression of the nitrogen product by the compressor 40 to about 6 bar.
  • the after-compressors 55, 56, 57 then bring the delivery oxygen product to be supplied to the common delivery line 61 to an output pressure of 7 bar.
  • a compressor for example, offer four- or multi-stage turbocompressors.
  • the Fig. 6 shows an exemplary process flow diagram of an air separation plant, which provides further decomposition products in addition to oxygen.
  • Abgriffsstellen 62 shown for the further decomposition products, which are suitable for mixing the high-purity oxygen product.
  • tapping points 62 may be coupled either singly or together with a mixing device to intersect a delivery oxygen product from the high purity oxygen product at line 19 with further decomposition products and / or process air.
  • the tapping points 62 can be provided, for example, on the line 8, the process air, ie compressed and purified air leads.
  • a gaseous high purity nitrogen product may be used on the nitrogen line 10 for mixing with the high purity oxygen product.
  • the blending or mixing of the high-purity oxygen product on the line 9 with the argon product present on the line 35 is conceivable.
  • An air separation process with internal compaction is performed, further with an argon rectification. It is first sucked raw ambient air to the air line 6 and filtered in the filter 16 and compressed in a turbo compressor at, for example, about 6 bar. The filter 16 removes dust particles before entering the compressor 18. In a further stage, the sucked air is cleaned via a direct contact cooler 20A and trickle evaporator cooler 20B. In the direct contact cooler 20A, the sucked and compressed air is washed out so that contaminants are removed. The water used in the lines 86, 88 is cooled in the trickle evaporator 20B against dried nitrogen residual gas from the rectification process. In the molecular sieve absorbers 22A, 22B used alternately to allow regeneration of the molecular sieves, moisture, carbon dioxide or hydrocarbons are removed from the air in the conduit 21. Finally, process air is available in the lines 23, 89.
  • the air is brought in the heat exchanger 84 in countercurrent to the recovered from the rectification of residual oxygen gas in line 83 near the liquefaction temperature.
  • the cycle compressor 24 compresses the process air, which is cooled in the main heat exchanger 28 in countercurrent with the oxygen from the low pressure column 31A and the nitrogen from the condenser 73 by means of the inner compression pumps 75, 77.
  • the oxygen and nitrogen evaporate, which can then be tapped off as the respective product on the oxygen or nitrogen lines 9, 10.
  • the recompressed, substantially liquid air passes through a liquid separator 65 and is supplied to the lower part of the column 31B through the line 71.
  • the liquid oxygen is supplied via the line 74
  • the liquid nitrogen is supplied via the line 76 to the inner compression pumps 75, 77 and brought into the high-pressure heat exchanger 28.
  • the pressure column 31B the air is pre-decomposed so that an oxygen-rich sump is formed and a virtually pure nitrogen-containing overhead fraction is formed.
  • the evaporator capacitor combination 73 of the vaporizing pure oxygen is liquefied.
  • a portion of the nitrogen is fed to the pressure column 31B as reflux.
  • the upper low-pressure column 31A further decomposition of the prefractions into pure oxygen takes place as bottom product, which is tapped on the line 74 and pure nitrogen as the top product which can be tapped on the line 82.
  • Reinargon can also be obtained in further rectification steps, with oxygen-argon mixture taken from the low-pressure column 31A being prefractionated in the crude argon column 32. In this case, the remaining nitrogen in the pure argon column 33 is completely removed, so that practically pure argon drops as product on the line 35.
  • the points indicated by the box 62 are suitable for coupling to a mixing device, as exemplified in the preceding figures. Thus it is possible to blur the high purity oxygen product to a suitable oxygen concentration for the consumer as the delivery oxygen product.
  • the presented methods and plants are particularly suitable for the provision of oxygen products for refineries or natural gas burners which are to be fired with certain oxygen mixtures.

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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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP09151023A 2009-01-21 2009-01-21 Procédé destiné au fonctionnement d'une installation de séparation de l'air Withdrawn EP2211131A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3048401A1 (fr) * 2015-01-20 2016-07-27 Linde Aktiengesellschaft Procédé et dispositif destinés à l'extraction variable d'argon par la séparation cryogénique de l'air
EP3767561A1 (fr) * 2019-07-17 2021-01-20 Linde GmbH Procédé de modélisation d'un procédé de fabrication d'un dispositif technique

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DE345760C (de) * 1917-02-16 1921-12-16 Walter Lachmann Rektifikationssaeule, vornehmlich fuer die Erzeugung von Sprengluft
US3143412A (en) 1960-11-28 1964-08-04 Dravo Corp Method of enriching the oxygen content of air supplied to blast furnaces
US4732597A (en) 1986-04-22 1988-03-22 The United States Of America As Represented By The United States Department Of Energy Low energy consumption method for separating gaseous mixtures and in particular for medium purity oxygen production
EP0377117A1 (fr) 1988-12-01 1990-07-11 Linde Aktiengesellschaft Procédé et dispositif de séparation de l'air
US5379599A (en) * 1993-08-23 1995-01-10 The Boc Group, Inc. Pumped liquid oxygen method and apparatus
US5722259A (en) * 1996-03-13 1998-03-03 Air Products And Chemicals, Inc. Combustion turbine and elevated pressure air separation system with argon recovery
JP2002286361A (ja) 2001-03-26 2002-10-03 Nippon Sanso Corp 窒素製造装置の副生ガスを利用した酸素富化ガスの製造方法及び装置
EP1666824A1 (fr) * 2004-12-03 2006-06-07 Linde Aktiengesellschaft Procédé et dispositif pour la récupération d'Argon par séparation cryogénique d'air
US20080011015A1 (en) * 2006-07-14 2008-01-17 Jean-Renaud Brugerolle System and apparatus for providing low pressure and low purity oxygen

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DE345760C (de) * 1917-02-16 1921-12-16 Walter Lachmann Rektifikationssaeule, vornehmlich fuer die Erzeugung von Sprengluft
US3143412A (en) 1960-11-28 1964-08-04 Dravo Corp Method of enriching the oxygen content of air supplied to blast furnaces
US4732597A (en) 1986-04-22 1988-03-22 The United States Of America As Represented By The United States Department Of Energy Low energy consumption method for separating gaseous mixtures and in particular for medium purity oxygen production
EP0377117A1 (fr) 1988-12-01 1990-07-11 Linde Aktiengesellschaft Procédé et dispositif de séparation de l'air
US5379599A (en) * 1993-08-23 1995-01-10 The Boc Group, Inc. Pumped liquid oxygen method and apparatus
US5722259A (en) * 1996-03-13 1998-03-03 Air Products And Chemicals, Inc. Combustion turbine and elevated pressure air separation system with argon recovery
JP2002286361A (ja) 2001-03-26 2002-10-03 Nippon Sanso Corp 窒素製造装置の副生ガスを利用した酸素富化ガスの製造方法及び装置
EP1666824A1 (fr) * 2004-12-03 2006-06-07 Linde Aktiengesellschaft Procédé et dispositif pour la récupération d'Argon par séparation cryogénique d'air
US20080011015A1 (en) * 2006-07-14 2008-01-17 Jean-Renaud Brugerolle System and apparatus for providing low pressure and low purity oxygen

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"OXYGEN ENRICHEMENT OF AIR: PROCESS DEVELOPMENTS AND ECONOMIC TRENDS", RESEARCH DISCLOSURE, MASON PUBLICATIONS, HAMPSHIRE, GB, no. 417, 1 January 1999 (1999-01-01), pages 94 - 101, XP000888462, ISSN: 0374-4353 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3048401A1 (fr) * 2015-01-20 2016-07-27 Linde Aktiengesellschaft Procédé et dispositif destinés à l'extraction variable d'argon par la séparation cryogénique de l'air
EP3767561A1 (fr) * 2019-07-17 2021-01-20 Linde GmbH Procédé de modélisation d'un procédé de fabrication d'un dispositif technique
WO2021008730A1 (fr) * 2019-07-17 2021-01-21 Linde Gmbh Procédé de modélisation d'un processus de fabrication d'un dispositif de technique des procédés

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