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RU2005109412A - METHOD AND INSTALLATION FOR THE PRODUCTION OF INERT GASES AND OXYGEN BY MEANS OF CRYOGENIC AIR DISTRIBUTION - Google Patents

METHOD AND INSTALLATION FOR THE PRODUCTION OF INERT GASES AND OXYGEN BY MEANS OF CRYOGENIC AIR DISTRIBUTION Download PDF

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RU2005109412A
RU2005109412A RU2005109412/06A RU2005109412A RU2005109412A RU 2005109412 A RU2005109412 A RU 2005109412A RU 2005109412/06 A RU2005109412/06 A RU 2005109412/06A RU 2005109412 A RU2005109412 A RU 2005109412A RU 2005109412 A RU2005109412 A RU 2005109412A
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stream
column
oxygen
pressure column
enriched
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RU2005109412/06A
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RU2319084C2 (en
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Лазад ЖАУАНИ (FR)
Лазад ЖАУАНИ
Фредерик ЖЮДА (FR)
Фредерик Жюда
Бернар СОЛНЬЕ (FR)
Бернар СОЛНЬЕ
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Л`Эр Ликид, Состьете Аноним А Директуар Э Консей Де Сюрвейянс Пур Л`Этюд Э Л`Эксплуатасьон Де Проседе Жорж Клод (Fr)
Л`Эр Ликид, Состьете Аноним А Директуар Э Консей Де Сюрвейянс Пур Л`Этюд Э Л`Эксплуатасьон Де Проседе Жорж Клод
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—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
    • F25J3/04303—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
    • F25J3/04406—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
    • F25J3/04745—Krypton and/or Xenon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/32—Processes or apparatus using separation by rectification using a side column fed by a stream from the high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
    • F25J2200/54—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column in the low pressure column of a double pressure main column system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/90—Details relating to column internals, e.g. structured packing, gas or liquid distribution
    • F25J2200/94—Details relating to the withdrawal point
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (12)

1. Способ производства кислорода и инертных газов посредством перегонки в системе колонн, содержащей, по меньшей мере, одну колонну (К01) среднего давления, одну колонну (К02) низкого давления и, по меньшей мере, одну вспомогательную колонну (К05), причем в этом способе1. A method of producing oxygen and inert gases by distillation in a column system comprising at least one medium pressure column (K01), one low pressure column (K02) and at least one auxiliary column (K05), wherein this way i) по меньшей мере, один поток охлажденного и очищенного воздуха (1) направляют в колонну среднего давления, в которой его разделяют;i) at least one stream of chilled and purified air (1) is directed to a medium pressure column in which it is separated; ii) по меньшей мере, первый обогащенный азотом поток (11) отводят из колонны среднего давления, и, по меньшей мере, одну часть этого потока направляют, напрямую или не напрямую, в колонну низкого давления;ii) at least the first nitrogen-rich stream (11) is diverted from the medium pressure column, and at least one part of this stream is directed, directly or indirectly, to the low pressure column; iii) промежуточный поток (БЖ1) отводят с промежуточного уровня колонны среднего давления;iii) the intermediate stream (BJ1) is diverted from the intermediate level of the medium pressure column; iv) поток (БЖ2), обогащенный кислородом по отношению к промежуточному потоку, отводят из нижней части колонны среднего давления и направляют в нижнюю часть вспомогательной колонны;iv) a stream (BJ2), enriched with oxygen relative to the intermediate stream, is withdrawn from the lower part of the medium pressure column and sent to the lower part of the auxiliary column; v) богатый азотом поток (ОА2) отводят из верхней части колонны низкого давления;v) a nitrogen-rich stream (OA2) is withdrawn from the top of the low pressure column; vi) богатый кислородом поток жидкости (ЖК) отводят из колонны низкого давления в виде продукта, необязательно после стадии испарения для того, чтобы образовать газообразный продукт; иvi) an oxygen-rich liquid stream (LC) is withdrawn from the low pressure column as a product, optionally after an evaporation step, to form a gaseous product; and vii) обогащенный кислородом поток (ПРОДУВКА), который также обогащен криптоном и ксеноном по отношению к второму обогащенному кислородом потоку, отводят из вспомогательной колонны, отличающийся тем, что промежуточный поток (БЖ1) направляют в колонну низкого давления, и, по меньшей мере, один поток (5, 15) жидкости, содержащий, по меньшей мере, 78 мол.% азота, направляют в виде флегмы во вспомогательную колонну.vii) an oxygen-enriched stream (PURGE), which is also enriched in krypton and xenon with respect to the second oxygen-enriched stream, is diverted from the auxiliary column, characterized in that the intermediate stream (BJ1) is directed to a low pressure column, and at least one a liquid stream (5, 15) containing at least 78 mol.% nitrogen is sent as reflux to an auxiliary column. 2. Способ по п.1, в котором третий обогащенный кислородом поток (продувка) направляют в верхнюю часть очистной колонны (К90), а четвертый обогащенный кислородом поток (смесь), образующий смесь, обогащенную криптоном и ксеноном, отводят, по меньшей мере, на несколько теоретических тарелок ниже в колонне.2. The method according to claim 1, in which the third oxygen-enriched stream (purge) is directed to the top of the treatment column (K90), and the fourth oxygen-enriched stream (mixture) forming a mixture enriched in krypton and xenon is diverted at least a few theoretical plates lower in the column. 3. Способ по п.1 или 2, в котором поток (5) жидкости, направляемый в виде флегмы, во вспомогательную колонну (К05), представляет собой сжиженный воздух и/или жидкость, обогащенную азотом по отношению к потоку сжиженного воздуха, направляемому в колонну среднего давления.3. The method according to claim 1 or 2, in which the fluid stream (5), directed in the form of reflux, to the auxiliary column (K05), is liquefied air and / or a liquid enriched with nitrogen in relation to the stream of liquefied air sent to medium pressure column. 4. Способ по п.1 или 2, в котором нижнюю часть вспомогательной колонны нагревают с помощью газа верхнего погона из колонны (К10) аргона.4. The method according to claim 1 or 2, in which the lower part of the auxiliary column is heated using gas overhead from the column (K10) of argon. 5. Способ по п.3, в котором сжиженный воздух (5) и/или жидкость, обогащенную азотом по отношению к воздуху, получают посредством теплообмена с богатым кислородом потоком жидкости (ЖК), поступающим из нижней части колонны низкого давления, необязательно после ступени повышения давления.5. The method according to claim 3, in which liquefied air (5) and / or a liquid enriched with nitrogen relative to air is obtained by heat exchange with an oxygen-rich liquid stream (LC) coming from the lower part of the low pressure column, optionally after the stage increase in pressure. 6. Способ по п.3, в котором обогащенная азотом жидкость (15) содержит, по меньшей мере, 80 мол.% азота.6. The method according to claim 3, in which the nitrogen-enriched liquid (15) contains at least 80 mol.% Nitrogen. 7. Способ по п.3, в котором сжиженный воздух (5) не поступает из колонны среднего давления.7. The method according to claim 3, in which the liquefied air (5) does not come from the medium pressure column. 8. Способ по п.1 или 2, в котором поток (5, 15) жидкости, направляемый в верхнюю часть вспомогательной колонны, более богат азотом, чем промежуточный поток.8. The method according to claim 1 or 2, in which the liquid stream (5, 15) directed to the upper part of the auxiliary column is richer in nitrogen than the intermediate stream. 9. Способ по п.1 или 2, в котором, по меньшей мере, 10% произведенного кислорода отводят в форме жидкости из колонны низкого давления.9. The method according to claim 1 or 2, in which at least 10% of the oxygen produced is withdrawn in the form of a liquid from a low pressure column. 10. Установка для производства кислорода и инертных газов посредством перегонки в системе колонн, содержащей, по меньшей мере, одну колонну (К01) среднего давления, одну колонну (К02) низкого давления и одну вспомогательную колонну (К05), причем эта установка содержит10. Installation for the production of oxygen and inert gases by distillation in a column system containing at least one medium pressure column (K01), one low pressure column (K02) and one auxiliary column (K05), and this installation contains i) средство (1) для направления, по меньшей мере, одного потока охлажденного и очищенного воздуха в колонну среднего давления, где он разделяется;i) means (1) for directing at least one stream of chilled and purified air to a medium pressure column, where it is separated; ii) средство для отвода, по меньшей мере, первого обогащенного азотом потока (11) из колонны среднего давления, и средство для направления, по меньшей мере, одной части этого потока, напрямую или не напрямую, в колонну низкого давления;ii) means for withdrawing at least the first nitrogen-rich stream (11) from the medium pressure column, and means for directing at least one part of this stream, directly or indirectly, to the low pressure column; iii) средство для отвода богатого азотом потока (ОА2) из верхней части колонны низкого давления;iii) means for draining the nitrogen-rich stream (OA2) from the top of the low pressure column; iv) средство для отвода промежуточного потока (БЖ1) с промежуточного уровня колонны среднего давления;iv) means for diverting the intermediate stream (BJ1) from the intermediate level of the medium pressure column; v) средство для направления потока, более богатого кислородом, чем промежуточный поток, из колонны среднего давления в нижнюю часть вспомогательной колонны;v) means for directing a stream richer in oxygen than the intermediate stream from the medium pressure column to the bottom of the auxiliary column; vi) средство для направления потока (5, 15) жидкости в виде флегмы во вспомогательную колонну;vi) means for directing the flow (5, 15) of liquid in the form of reflux into the auxiliary column; vii) средство для отвода богатого кислородом потока жидкости (ЖК) из нижней части колонны низкого давления в виде продукта, необязательно после ступени испарения, чтобы образовать газообразный продукт; иvii) means for discharging an oxygen-rich liquid stream (LC) from the bottom of the low pressure column as a product, optionally after an evaporation step, to form a gaseous product; and viii) средство для отвода третьего обогащенного кислородом потока (ПРОДУВКА), который также обогащен криптоном и ксеноном по отношению ко второму обогащенному кислородом потоку, из вспомогательной колонны,viii) means for removing the third oxygen-rich stream (PURGE), which is also enriched in krypton and xenon with respect to the second oxygen-rich stream, from the auxiliary column, отличающаяся тем, что она включает средство для направления, в качестве потока флегмы, во вспомогательную колонну, сжиженного воздуха или потока жидкости, обогащенного азотом по отношению к потоку жидкого воздуха, направляемому в колонну среднего давления.characterized in that it includes means for directing, as a reflux stream, into the auxiliary column, liquefied air or a liquid stream enriched with nitrogen with respect to the liquid air stream directed to the medium pressure column. 11. Установка по п.10, которая включает очистную колонну (К 90), средство для направления третьего обогащенного кислородом потока (продувка) в верхнюю часть очистной колонны, и средство (смесь) для отвода четвертого обогащенного кислородом потока, образующего смесь, обогащенную криптоном и ксеноном, по меньшей мере, на несколько теоретических тарелок ниже в колонне.11. The installation according to claim 10, which includes a treatment column (K 90), means for directing a third oxygen-enriched stream (purge) to the top of the treatment column, and means (mixture) for draining the fourth oxygen-enriched stream forming a krypton-enriched mixture and xenon, at least a few theoretical plates below in the column. 12. Установка по п.10 или 11, которая включает трубопровод теплообмена, в котором сжиженный воздух и/или жидкость, обогащенную азотом по отношению к воздуху, получают путем теплообмена с богатым кислородом потоком жидкости, поступающим из нижней части колонны низкого давления необязательно после ступени повышения давления.12. The apparatus of claim 10 or 11, which includes a heat exchange pipe in which liquefied air and / or a nitrogen-enriched liquid with respect to air is obtained by heat exchange with an oxygen-rich liquid stream coming from the bottom of the low pressure column optionally after the stage increase in pressure.
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