EP2268990A2 - Procede et appareil de production d'oxygene par separation d'air par distillation cryogenique - Google Patents

Procede et appareil de production d'oxygene par separation d'air par distillation cryogenique

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Publication number
EP2268990A2
EP2268990A2 EP09742273A EP09742273A EP2268990A2 EP 2268990 A2 EP2268990 A2 EP 2268990A2 EP 09742273 A EP09742273 A EP 09742273A EP 09742273 A EP09742273 A EP 09742273A EP 2268990 A2 EP2268990 A2 EP 2268990A2
Authority
EP
European Patent Office
Prior art keywords
column
nitrogen
pressure column
vaporizer
sent
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.)
Withdrawn
Application number
EP09742273A
Other languages
German (de)
English (en)
French (fr)
Inventor
Benoît DAVIDIAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FR0852710A external-priority patent/FR2930331B1/fr
Priority claimed from FR0852708A external-priority patent/FR2930329A1/fr
Priority claimed from FR0852705A external-priority patent/FR2930326B1/fr
Priority claimed from FR0852706A external-priority patent/FR2930327A1/fr
Priority claimed from FR0852707A external-priority patent/FR2930328A1/fr
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP2268990A2 publication Critical patent/EP2268990A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04181—Regenerating the adsorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—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
    • F25J3/0406—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 nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04103—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression using solely hydrostatic liquid head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—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
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—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
    • F25J3/04206—Division of the main heat exchange line in consecutive sections having different functions including a so-called "auxiliary vaporiser" for vaporising and producing a gaseous 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
    • 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
    • F25J3/04284—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
    • F25J3/04309—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 nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—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
    • F25J3/04418—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 with thermally overlapping high and low pressure columns
    • 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
    • F25J2200/34—Processes or apparatus using separation by rectification using a side column fed by a stream from the 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
    • 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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/40—One fluid being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/42—One fluid being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/50—One fluid being oxygen

Definitions

  • the present invention relates to a method and an apparatus for producing oxygen by air separation by cryogenic distillation.
  • An object of the invention is to reduce the specific energy for the separation of oxygen low purity low pressure, especially in the schemes where the nitrogen under pressure is not valued by the end customer.
  • the object of the invention is achieved by the use of a scheme with three vaporizers in the low pressure column in which: • The tank vaporizer works with medium pressure compressed cold nitrogen
  • the low intermediate vaporizer works either with medium pressure air or with medium pressure cold pressed nitrogen Depending on the variants, the specific energy gain is 0.5% to 7%.
  • US-A-5006139 discloses a method of producing nitrogen using a low pressure column whose vessel vaporizer is heated by a compressed medium pressure nitrogen flow in a cold compressor. According to the invention, it is also proposed to use several turbines to better optimize the exchange line. The process of the present invention produces gaseous oxygen and preferably does not produce nitrogen from the medium pressure column.
  • a process for producing oxygen by air separation by cryogenic distillation in an installation comprising a double column comprising a medium pressure column and a low pressure column, the low pressure column containing a vat vaporizer, an intermediate vaporizer and an upper vaporizer in which: a) compressed air is purified in a purification unit, cooled in a heat exchange line and sent to the medium pressure column of the double column b) a fluid rich in oxygen is taken from the low pressure column, heated and sent to the customer c) nitrogen withdrawn from the medium pressure column is divided into at least three parts d) a first part of the nitrogen is expanded in a first turbine e) a second part of the nitrogen is supercharged in a cold compressor and sent to the tank vaporizer, the nitrogen thus condensed being sent to at least one column of the double column; f) a third part of the nitrogen is sent to the upper vaporizer, without pressure modification step downstream of the column from which it is withdrawn and upstream of the upper vapor
  • the gas flow sent to the intermediate vaporizer is nitrogen coming from the medium pressure column
  • the gas flow to the intermediate vaporizer is compressed air, purified and cooled.
  • the first part of the expanded nitrogen in the first turbine is used for the regeneration of the purification unit
  • the first turbine drives the cold compressor where the second part of the fluid is overpressed and supplies substantially all the process frigories;
  • the low pressure column does not include a head condenser
  • a device for producing oxygen by separation of air by cryogenic distillation comprising a double column comprising a medium pressure column and a low pressure column, the low pressure column containing a tank vaporizer, an intermediate vaporizer and an upper vaporizer, a purification unit, an exchange line, at least a first turbine, at least a cold compressor, means for sending purified compressed air into the purification unit and cooled in the exchange line to the medium-pressure column of the double column, means for taking an oxygen-rich fluid in the low pressure column, means for heating it possibly constituted at least in part by the exchange line and means for sending the warm oxygen-rich fluid sent to the customer, means for dividing nitrogen withdrawn from the medium pressure column in at least three parts, means for sending a first portion of the nitrogen to a first turbine, means for sending a second portion of the nitrogen to a compressor cooler for being overpressed, means for sending the second portion supercharged to the vessel vaporizer, means for sending the nitrogen thus condensed to at least one column of the
  • the apparatus comprises: means for connecting the intermediate vaporizer with the head of the medium pressure column
  • the first turbine is coupled to the cold compressor where the second part of the fluid is supercharged and constitutes the only turbine of the apparatus
  • the low pressure column does not include a head condenser means for vaporizing liquid oxygen, possibly in the exchange line, and possibly means for pressurizing liquid oxygen upstream of the means for vaporizing the liquid oxygen
  • Figure 1 shows an air separation apparatus in which a flow of pressurized and purified air 1 is divided into three flow rates 3, 5, 7.
  • the flow 3 cools by running from one end to the other line 11 and is sent to the medium pressure column 15 of a double column.
  • the flow 5 cools by running from one end to the other the exchange line 11 and is sent to an intermediate vaporizer 21 of the low pressure column 17 of the double column 15, 17.
  • the other air flow 7 is supercharged in a hot booster 9 cools by traversing from one end to the other the exchange line 11 and is sent to a vaporizer 13 where it condenses at least partially by heat exchange with liquid oxygen pressurized.
  • the condensed air is either sent entirely to the medium pressure column or divided between the medium pressure column and the low pressure column 17.
  • Rich liquid 25 Rich liquid 25, poor liquid 61 and possibly a liquid 27 close to liquid air are sent from the medium pressure column 15 to the low pressure column 17 as reflux flow rates after subcooling in exchanger 29.
  • a flow of liquid oxygen 33 is withdrawn from the low pressure column, pressurized by the pump 35 and vaporized in the vaporizer 13 upstream of the exchange line 11.
  • the compression of the fluid 33 can also be done by a hydrostatic head, without the pump 35.
  • Low pressure nitrogen 31 is withdrawn at the top of the low pressure column 17 and is heated in the exchangers 29, 11.
  • a medium pressure nitrogen gas flow 39 is withdrawn at the top of the medium pressure column 15 and divided into two. Part 53 is sent to an upper vaporizer 23 of the low pressure column 17 where it condenses before being returned to the medium pressure column as reflux. The rest of the nitrogen 41 is divided in two, a portion 43 is sent to a compressor cold 51 to form a flow 55, this flow 55 is sent to the vessel vaporizer 19 of the low pressure column 17. In this vaporizer 19 it condenses and then serves as reflux for at least one of the columns.
  • the remainder 45 of the nitrogen is sent to the exchange line, is heated to an intermediate level and is sent to a turbine 47.
  • the nitrogen expanded in the turbine 47 is sent to the cold end of the exchange line and warms up to become flow 49.
  • FIG. 2 shows an air separation apparatus in which a pressurized and purified air flow rate 1 is divided into two flow rates. 7.
  • the flow 3 cools by traversing from one end to the other the exchange line 11 and is sent to the medium pressure column 15 of a double column.
  • the other air flow 7 is supercharged in a hot booster 9 cools by traversing from one end to the other the exchange line 11 and is sent to a vaporizer 13 where it condenses at least partially by exchange of heat with pressurized liquid oxygen.
  • the condensed air is either sent entirely to the medium pressure column or divided between the medium pressure column and the low pressure column 17.
  • Rich liquid 25 Rich liquid 25, poor liquid 61 and possibly a liquid 27 close to liquid air are sent from the medium pressure column 15 to the low pressure column 17 as reflux flow rates after subcooling in exchanger 29.
  • a flow of liquid oxygen 33 is withdrawn from the low pressure column, pressurized by the pump 35 and vaporized in the vaporizer 13 upstream of the exchange line 11.
  • the compression of the fluid 33 can also be done by a hydrostatic head, without the pump 35.
  • Low pressure nitrogen 31 is withdrawn at the top of the low pressure column 17 and is heated in the exchangers 29, 11.
  • a medium pressure nitrogen gas flow 39 is withdrawn at the top of the medium pressure column 15 and divided into two. Part 53 is sent to an upper vaporizer 23 of the low pressure column 17 where it condenses before being returned to the medium pressure column as reflux. The rest of the air is again divided in two. A fraction is sent to the compressor cold 151 to become the flow 155 which heats the intermediate vaporizer 21 before being sent to the columns as reflux. The rest of the nitrogen 41 is divided in two, a portion 43 is sent to a cold compressor 51 to form a flow 55, this flow 55 is sent to the vessel vaporizer 19 of the low pressure column 17. In this vaporizer 19 it condenses and then serves as reflux for at least one of the columns.
  • the remainder 45 of the nitrogen is sent to the exchange line, is heated to an intermediate level and is sent to a turbine 47.
  • the nitrogen expanded in the turbine 47 is sent to the cold end of the exchange line and
  • the presence of the two cold compressors 51, 151 on the medium pressure nitrogen makes it possible to better adjust the power distribution on the compressors, in line with the need for reboiling of the low pressure column.
  • Figure 3 shows an air separation apparatus in which a flow of air 1 pressurized by a compressor M and purified in a purification unit 2 is divided into two flow rates 3.7.
  • the flow 3 cools by traversing from one end to the other the exchange line 11 and is sent to the medium pressure column 15 of a double column.
  • the other 7 is supercharged in a hot booster 9 cools by traversing from one end to the other the exchange line 11 and is sent to a vaporizer 13 where it is condensed at least partially by heat exchange with water. pressurized liquid oxygen.
  • the condensed air is either sent entirely to the medium pressure column or divided between the medium pressure column and the low pressure column 17.
  • Rich liquid 25, poor liquid 61 and possibly a liquid 27 close to liquid air are sent from the medium pressure column 15 to the low pressure column 17 as reflux flow rates after subcooling in exchanger 29.
  • a flow of liquid oxygen 33 is withdrawn from the low pressure column, pressurized by the pump 35 and vaporized in the vaporizer 13 upstream of the exchange line 11.
  • the compression of the fluid 33 can also be done by a hydrostatic head, without the pump 35.
  • Low pressure nitrogen 31 is withdrawn at the top of the low pressure column 17 and is heated in the exchangers 29, 11.
  • a medium pressure nitrogen gas flow 39 is withdrawn at the top of the medium pressure column 15 and divided into two. Part 53 is sent to an upper vaporizer 23 of the low pressure column 17 where it condenses before being returned to the medium pressure column as reflux. The rest of the air is again divided in two. A fraction is sent to the cold compressor 151 to become the flow 155, the flow 155 is cooled in the exchange line 11 before serving to heat the intermediate vaporizer 21 before being sent to the columns as reflux. The rest of the nitrogen 41 is divided in two, a portion 43 is sent to a cold compressor 51 to form a flow 55, this flow 55 is sent to the vessel vaporizer 19 of the low pressure column 17, after having cooled in the exchange line 11.
  • this vaporizer 19 it condenses and then serves as reflux for at least one of the columns.
  • the rest of the nitrogen is sent to the exchange line, warms to an intermediate level and is divided in two.
  • a portion 49 of the nitrogen 45 is sent to a turbine 47.
  • the nitrogen expanded in the turbine 47 is sent to the cold end of the exchange line and heats up before serving to periodically regenerate the purification unit 2
  • the remainder of the nitrogen 46 continues its heating in the exchange line 11 and is divided in two, a portion 149 being sent to a turbine 147 with a higher inlet temperature than the turbine 47.
  • This part of the Nitrogen is relaxed, warmed up and sent to the atmosphere.
  • the remainder 249 of the nitrogen is sent to a turbine 247 with a higher inlet temperature than the turbines 47, 147. This portion 249 of the nitrogen is expanded, heated and sent to the atmosphere.

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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)
EP09742273A 2008-04-22 2009-04-08 Procede et appareil de production d'oxygene par separation d'air par distillation cryogenique Withdrawn EP2268990A2 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
FR0852710A FR2930331B1 (fr) 2008-04-22 2008-04-22 Procede et appareil de separation d'air par distillation cryogenique
FR0852708A FR2930329A1 (fr) 2008-04-22 2008-04-22 Procede et appareil de separation d'air par distillation cryogenique
FR0852705A FR2930326B1 (fr) 2008-04-22 2008-04-22 Procede et appareil de separation d'air par distillation cryogenique
FR0852706A FR2930327A1 (fr) 2008-04-22 2008-04-22 Procede et appareil de separation d'air par distillation cryogenique
FR0852709A FR2930330B1 (fr) 2008-04-22 2008-04-22 Procede et appareil de separation d'air par distillation cryogenique
FR0852707A FR2930328A1 (fr) 2008-04-22 2008-04-22 Procede et appareil de separation d'air par distillation cryogenique
PCT/FR2009/050617 WO2009136075A2 (fr) 2008-04-22 2009-04-08 Procede et appareil de separation d'air par distillation cryogenique

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EP2268990A2 true EP2268990A2 (fr) 2011-01-05

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EP (1) EP2268990A2 (zh)
JP (1) JP2011518307A (zh)
CN (1) CN102016469A (zh)
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CA (1) CA2722261A1 (zh)
FR (1) FR2930330B1 (zh)
WO (1) WO2009136075A2 (zh)

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FR2930331B1 (fr) * 2008-04-22 2013-09-13 Air Liquide Procede et appareil de separation d'air par distillation cryogenique
FR2973865B1 (fr) * 2011-04-08 2015-11-06 Air Liquide Procede et appareil de separation d'air par distillation cryogenique
US9097459B2 (en) 2011-08-17 2015-08-04 Air Liquide Process & Construction, Inc. Production of high-pressure gaseous nitrogen
US20130042647A1 (en) * 2011-08-18 2013-02-21 Air Liquide Process & Construction, Inc. Production Of High-Pressure Gaseous Nitrogen
EP2758734B1 (de) * 2011-09-20 2018-07-18 Linde Aktiengesellschaft Verfahren und vorrichtung zur tieftemperaturzerlegung von luft
FR2990500A1 (fr) * 2012-05-11 2013-11-15 Air Liquide Procede et appareil de separation d'air par distillation cryogenique
EP3019803B1 (de) * 2013-07-11 2022-04-20 Linde GmbH Verfahren und vorrichtung zur sauerstoffgewinnung durch tieftemperaturzerlegung von luft mit variablem energieverbrauch
FR3011916B1 (fr) * 2013-10-15 2015-11-13 Air Liquide Procede et appareil de separation d'air par distillation cryogenique
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US10018414B2 (en) * 2015-07-31 2018-07-10 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for the production of low pressure gaseous oxygen

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AU2009245592B2 (en) 2013-09-19
WO2009136075A3 (fr) 2010-10-07
AU2009245592A1 (en) 2009-11-12
WO2009136075A4 (fr) 2010-11-25
CN102016469A (zh) 2011-04-13
US20110067445A1 (en) 2011-03-24
FR2930330A1 (fr) 2009-10-23
FR2930330B1 (fr) 2013-09-13
JP2011518307A (ja) 2011-06-23
CA2722261A1 (fr) 2009-11-12
WO2009136075A2 (fr) 2009-11-12

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