WO2009130430A2 - Method and apparatus for air separation by cryogenic distillation - Google Patents

Method and apparatus for air separation by cryogenic distillation Download PDF

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Publication number
WO2009130430A2
WO2009130430A2 PCT/FR2009/050495 FR2009050495W WO2009130430A2 WO 2009130430 A2 WO2009130430 A2 WO 2009130430A2 FR 2009050495 W FR2009050495 W FR 2009050495W WO 2009130430 A2 WO2009130430 A2 WO 2009130430A2
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WO
WIPO (PCT)
Prior art keywords
pressure column
low pressure
nitrogen
column
sent
Prior art date
Application number
PCT/FR2009/050495
Other languages
French (fr)
Other versions
WO2009130430A3 (en
Inventor
Benoît DAVIDIAN
Original Assignee
L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation 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 FR0852709A external-priority patent/FR2930330B1/en
Priority claimed from FR0852705A external-priority patent/FR2930326B1/en
Priority claimed from FR0852706A external-priority patent/FR2930327A1/en
Priority claimed from FR0852707A external-priority patent/FR2930328A1/en
Priority claimed from FR0852710A external-priority patent/FR2930331B1/en
Priority claimed from FR0852708A external-priority patent/FR2930329A1/en
Application filed by L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude filed Critical L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude
Priority to PCT/FR2009/050495 priority Critical patent/WO2009130430A2/en
Publication of WO2009130430A2 publication Critical patent/WO2009130430A2/en
Publication of WO2009130430A3 publication Critical patent/WO2009130430A3/en

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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
    • F25J3/04187—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
    • F25J3/04212—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 and simultaneously condensing vapor from a column serving as reflux within the or another column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04048—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
    • F25J3/04248—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
    • F25J3/04436—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 at least a triple pressure main column system
    • F25J3/04448—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 at least a triple pressure main column system in a double column flowsheet with an intermediate 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
    • F25J2200/34—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
    • 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

Definitions

  • the present invention relates to a method and an apparatus for separating air by cryogenic distillation. Oxycombustion in a boiler makes it easier to capture CO 2 .
  • the energy consumption of the air separation unit weighs significantly on the overall efficiency of the installation. It is proposed to reduce the consumption of the ASU, in the case where it is known to valorize nitrogen under pressure, for example by heating and then relaxation in a hot turbine (integration with boiler).
  • the invention consists in cleverly using a cold booster, so as to increase the pressure of the waste while maintaining the air pressure or to reduce the operating air pressure while maintaining the residual pressure constant, on diagrams of the type "apparatus under pressure".
  • a process for separating air by cryogenic distillation in a three-column system constituted by a medium pressure column, an intermediate pressure column and a low pressure column having at least a first pressure column.
  • a second vaporizer in which: i) compressed, purified and cooled air is sent in an exchange line to the medium pressure column; ii) nitrogen and oxygen enriched flow rates derived from the medium pressure column are sent to the low pressure column iii) is sent an oxygen-enriched liquid flow from the medium pressure column to the intermediate pressure column iv) a first gas containing at least as much nitrogen as air is sent to the first tank vaporizer of the low pressure column v) a second gas containing at least as much nitrogen as the air is sent to the second vaporizer at an intermediate level of the low pressure column vi) is sent a oxygen-rich liquid from the low pressure column vessel to a head condenser of the intermediate pressure column or the low pressure column vii) oxygen and nitrogen enriched liquids are fed from the intermediate pressure column to the low pressure column viii) an oxygen rich gas is withdrawn from the head condenser of the intermediate pressure column or the low pressure column and ix) a nitrogen rich gas is withdrawn from the head of the low pressure column.
  • At least the first gas containing at least as much nitrogen as the air upstream of the first vaporizer in the bottom of the low pressure column is overpressed in a cold booster, a nitrogen-rich gas is sent from the top of the middle column.
  • pressure to a third vaporizer in the low pressure column, located above the second vaporizer, the gas entering the third vaporizer substantially at medium pressure and the second gas has the same composition as the first gas;
  • the second gas containing at least as much nitrogen as the air upstream of the second vaporizer is overpressed in a second cold booster;
  • the first and second gases are air flows
  • the first and second gases are nitrogen flow rates
  • an oxygen rich liquid is sent from the bottom of the low pressure column to a top condenser of the low pressure column, a bottom liquid from the intermediate pressure column is sent to the head condenser of the intermediate pressure column; the liquid vaporises at least partially, the vaporized liquid is boostered in a cold booster and is sent to the low pressure column.
  • an apparatus for separating air by cryogenic distillation comprising a three-column system consisting of a medium pressure column, an intermediate pressure column and a low pressure column having at least one first and second vaporizers and: a) means for sending compressed, purified and cooled air in an exchange line to the medium pressure column; b) means for sending nitrogen and oxygen enriched flow rates derived from the medium pressure column at the low pressure column c) means for sending an oxygen enriched liquid flow from the medium pressure column to the intermediate pressure column; d) means for sending a first gas containing at least as much nitrogen as air to the first tank vaporizer of the low pressure column e) means for sending a second gas containing at least as much nitrogen as air to the second vaporizer at an intermediate level of the low pressure column; f) means for sending an oxygen-rich liquid to the bottom of the vessel; the low pressure column at a top condenser (31, 59) of the intermediate pressure column or the low pressure column; g) means for sending
  • the apparatus comprises:
  • a cold booster means for sending to the cold booster at least the first gas containing at least as much nitrogen as the air upstream of the first tank vaporizer;
  • low pressure column means for sending nitrogen from the medium pressure column to the third vaporizer substantially at medium pressure and means for dividing a gas flow in half to form the first and second gases;
  • the means for dividing a gas flow to form the first and the second are means for dividing an air flow; means for sending air to the second vaporizer (50) at substantially the medium pressure; - The means for dividing a gas flow to form the first and the second are means for dividing a flow of nitrogen from the medium pressure column;
  • the (each) turbine is coupled to a cold booster
  • FIG. 1 we see a double column consisting of a medium pressure column 9, and a low pressure column.
  • the low pressure column is a single body and contains three vaporizers.
  • the installation also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column.
  • All air 1 is compressed at a single pressure in a main compressor and passes through the exchange line 3 at this pressure. Downstream of the exchange line 3, the air is divided into three parts 13, 14, 1 14.
  • the flow 13 is sent to the tank of the medium pressure column 9.
  • the flow 14 is sent to a cold booster 85 where he is compressed.
  • the flow 14 is sent to a cold booster 185 where it is compressed.
  • the rich liquid tank 18 of the medium pressure column 9 is sent to the intermediate pressure column 25 after expansion.
  • a fluid close to the composition of the liquid air 27 of the medium pressure column 9 is sent to the upper part 19 of the low pressure column.
  • the poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion.
  • Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two.
  • Part 21 heats up partially in the line exchange 3 to form the flow 90. Then the flow 90 is expanded in a turbine 95 to form the expanded flow 91 and the expanded nitrogen flow 91 is heated through the entire exchange line 3. Another part 23 medium pressure nitrogen gas is sent to a tank vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62. The liquid flow 62 is sent to the head of the intermediate intermediate pressure column.
  • Residual nitrogen 43 taken at the top of the low pressure column is heated in the exchange line 3 to form the flow 45.
  • the upper vaporizer 152 is heated with nitrogen gas 150 from the medium pressure column, without pressure change.
  • the other two 50.52 vaporizers are heated by supercharged air in two 85,185 cold boosters connected in parallel.
  • the flow 14 is supercharged in the booster 85 and sent to the tank vaporizer 52, the flow 1 14 is supercharged in the booster 185 and sent to the intermediate vaporizer 50.
  • the condensed nitrogen produced in the upper vaporizer 152 is sent to the top of the medium pressure column 9 and the condensed air produced in the vaporizers 50, 52 is sent to the medium pressure column 9 at the level of withdrawal of the flow 27.
  • Liquid oxygen 37 is withdrawn from the tank of the low pressure column 19 and sent to the top condenser 31 of the intermediate pressure column. There it vaporizes to form the flow 41 which is heated in the exchanger 103 and then in the exchanger 3 to form the oxygen-rich product of the process.
  • the tank liquid 35 of the intermediate pressure column 25 is sent to the low pressure column 19.
  • Liquid nitrogen 27 is taken at the top of the intermediate pressure column 25 and sent to the top of the low pressure column 19.
  • purge flow 42 is withdrawn from the condenser 31.
  • the rich liquid tank 18 of the medium pressure column 9 is sent to the intermediate pressure column 25 after expansion.
  • a close fluid in composition liquid air 27 of the medium pressure column 9 is sent to the upper part 19 of the low pressure column after the poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion.
  • Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 21 is partially heated in the exchange line 3 to form the flow 90. Then this flow 90 is expanded in a turbine 95 to form the expanded flow 91 and this expanded nitrogen flow 91 is heated through the entire line. 3.
  • Another portion 23 of the medium pressure nitrogen gas is sent to a vessel vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62.
  • the liquid flow 62 is sent to the head of the middle intermediate pressure column.
  • Residual nitrogen 43 taken at the top of the low pressure column is heated in the exchange line 3 to form the flow 45.
  • the upper vaporizer 152 is heated with nitrogen gas 150 from the medium pressure column, without pressure change.
  • the other two 50.52 vaporizers are heated by supercharged air in two 85,185 cold boosters connected in parallel.
  • the flow 14 is supercharged in the booster 85 and sent to the tank vaporizer 52, the flow 1 14 is supercharged in the booster 185 and sent to the intermediate vaporizer 50.
  • the condensed nitrogen produced in the upper vaporizer 152 is sent to the top of the medium pressure column 9 and the condensed air produced in the vaporizers 50, 52 is sent to the medium pressure column 9 at the level of withdrawal of the flow 27.
  • Liquid oxygen 37 is withdrawn from the tank of the low pressure column 19 and sent to the top condenser 31 of the intermediate pressure column. There, it vaporizes to form the flow 41 which is heated in the exchanger 103 and then in the exchanger 3 to form the oxygen-rich product of the process.
  • the tank liquid 35 of the intermediate pressure column 25 is sent to the low pressure column 19.
  • Liquid nitrogen 27 is taken at the top of the intermediate pressure column 25 and sent to the top of the low pressure column 19.
  • purge flow 42 is withdrawn from the condenser 31.
  • medium pressure nitrogen withdrawn at the top of the medium pressure column 9 is divided into five.
  • a first part is supercharged in a first cold booster 85 and sent to the tank vaporizer 52
  • a second part is supercharged in a second cold booster 185 and sent to the intermediate booster 50
  • a third part is not overpressed but is sent to the vaporizer upper 151
  • the fourth portion 90 is for the turbine 95 as in Figure 2.
  • the fifth portion 23 serves to reboil the intermediate pressure column 25.
  • FIG. 3 we see a double column consisting of a medium pressure column 9, and a low pressure column.
  • the low pressure column is a single body and contains three vaporizers.
  • the installation also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column.
  • All the air 1 is compressed at a single pressure corresponding to the pressure of the column 9 in a main compressor and passes through the exchange line 3 at this pressure. Downstream of the exchange line 3, the air is divided into three parts 13,14,1 14.
  • the flow 13 is sent to the tank of the medium pressure column 9.
  • the flow 14 is sent to a cold booster 85 where he is compressed.
  • the flow 14 at medium pressure is sent to the intermediate vaporizer 50 without pressure change.
  • the rich liquid tank 18 of the medium pressure column 9 is sent to the intermediate pressure column 25 after expansion.
  • a fluid close to the composition of the liquid air 27 of the medium pressure column 9 is sent to the upper part 19 of the low pressure column.
  • the poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion.
  • Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two.
  • a portion 90 is partially heated in the exchange line 3.
  • a portion of this flow 90 is expanded in a turbine 95 to form the expanded flow 91 and this expanded nitrogen flow 91 is heated through the entire line of exchange 3.
  • Another portion of the flow 90 is heated to a temperature higher than the inlet temperature of the turbine 95 and is sent at this temperature to a turbine 195. Then it warms up again in the exchanger 3.
  • a other part 23 nitrogen gas medium pressure is sent to a tank vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62.
  • the liquid flow 62 is sent to the head of the intermediate intermediate pressure column.
  • Residual nitrogen 43 taken at the head of the low pressure column is heated in the exchange line 3 to form the flow 45.
  • the upper vaporizer 152 is heated with nitrogen gas 150 from the medium pressure column, without pressure change.
  • the two other vaporizers 50, 52 are heated by air, of which respectively a superpressed flow rate in the cold booster 85 and an unpressurized flow rate 14.
  • the flow 14 is supercharged in the booster 85 and sent to the tank vaporizer 52.
  • the flow 1 14 is not overpressed and is sent to the intermediate vaporizer 50.
  • the condensed nitrogen produced in the upper vaporizer 152 is sent to the top of the medium pressure column 9 and the condensed air produced in the vaporizers 50,52 is sent to the medium pressure column 9 at the level of withdrawal of the flow rate 27.
  • Liquid oxygen 37 is withdrawn from the tank of the low pressure column
  • the tank liquid 35 of the intermediate pressure column 25 is sent to the low pressure column 19.
  • Liquid nitrogen 27 is taken at the top of the intermediate pressure column 25 and sent to the top of the low pressure column 19.
  • a purge flow 42 is withdrawn from the condenser 31.
  • FIG. 4 there is shown a double column constituted by a medium pressure column 9, and a low pressure head condenser column 59.
  • the low pressure column comprises an upper portion 19 and a lower portion
  • each part having a tank vaporizer 50, 52.
  • the installation also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column and having a head condenser 31 and a vaporizer of tank 22.
  • Air 1 from a main compressor is divided in two to form a flow 5 and a flow 1 1.
  • the flow rate 5 is overpressed in a hot booster 2, cooled and sent to the hot end of an exchange line 3 where it cools partially to form the flow 7.
  • the flow 7 is expanded in an insufflation turbine 4 to form the expanded flow 6 which is sent to an intermediate level of the upper part 19 of the low pressure column.
  • the rest of the air 1 1 cools in the exchange line 3, being divided into two flow rates 13, 14 just downstream of the cold end
  • the flow 13 is sent to the tank of the medium pressure column 9.
  • the flow 14 is sent to the tank vaporizer 52 of the lower part 39 of the low pressure column where it condenses to form the flow 15, is expanded in a valve and sent to the medium pressure column 9 in liquid form.
  • the rich liquid tank 18 of the medium pressure column 9 is sent to the lower part of the intermediate pressure column 25 after expansion.
  • a fluid close to the liquid air 27 of the medium pressure column 9 is divided in two, a portion 28 being sent to the upper part 19 of the low pressure column after expansion and a portion 29 being sent to an intermediate level of the column at intermediate pressure after relaxation.
  • the flow 15 after expansion is sent, partly to the medium pressure column 9, partly to the intermediate pressure column 25, partly to the low pressure column 19 after further expansion (instead of the fluid 27 ).
  • the poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion.
  • Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 21 is heated in the exchange line 3 to form the flow 20.
  • Another portion 23 of the medium pressure nitrogen gas is sent, without being overpressed, to a tank vaporizer 22 of the intermediate pressure column 25. where it condenses to form the liquid flow 62.
  • the liquid flow 62 is mixed with the reflux flow 9 and the liquid 27 withdrawn at the top of the intermediate pressure column and the mixture is sent to the top of the low pressure column.
  • Bottom liquid from the lower portion 39 is expanded and fed to the head condenser 59 of the low pressure column 19.
  • the overhead gas 55 of the lower portion 39 is sent to the bottom of the low pressure column and the liquid tank 53 of the tank of the upper part 19 of the low pressure column is sent to the top of the lower part.
  • Gaseous oxygen 41 vaporized in the head condenser 59 against the top nitrogen of the low pressure column is heated in the exchange line 3 to form the product 44.
  • Residual nitrogen 43 taken at the head of the low pressure column is heated in the exchange line 3 to form the flow 45.
  • the top condenser 31 of the intermediate pressure column 25 is fed with the tank liquid 35 of this same column.
  • the liquid is divided in two, a fraction 63 feeding the top condenser of the column 25 and the remainder 64 being expanded and sent to the upper part of the low pressure column 19.
  • the vaporized liquid 61 in the condenser is compressed in a booster cold 85 and then sent as flow 66 to the low pressure column at a lower level than the tank liquid inlet 64.
  • the cooling capacity being surplus (with a cold end gap of the important exchange line), we can place the cold booster 85 without medium pressure nitrogen turbine or increase the insufflation (ie without extra cold).
  • FIG. 5 shows a double column constituted by a medium pressure column 9, and a head condenser low pressure column 59.
  • the low pressure column comprises an upper part 19 and a lower part 39, each part having a vaporizer of tank 50, 52.
  • the plant also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column and having a top condenser 31 and a tank vaporizer 22.
  • Air 1 from a main compressor is divided in two to form a flow 5 and a flow 1 1.
  • the flow rate 5 is supercharged in a hot booster 2, cooled and sent to the hot end of an exchange line 3 where it cools partially to form the flow 7.
  • the flow 7 is expanded in an insufflation turbine 4 to form the relaxed flow 6 that is sent to a level intermediate of the upper part 19 of the low pressure column.
  • the rest of the air 1 1 cools in the exchange line 3 to form the flow 12.
  • the entire flow 12 is sent to the bottom vaporizer 52 of the lower part 39 of the low pressure column, without being overpressed, where it condenses to form the flow 15, and sent to the medium pressure column 9 in partially liquid form.
  • This variant of partial condensation of the air in the tank of the low pressure column can be applied to all the diagrams proposed in this document.
  • the rich liquid tank 18 of the medium pressure column 9 is sent to the lower part of the intermediate pressure column 25 after expansion.
  • the poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion.
  • Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 21 is heated in the exchange line 3 to form the flow 20.
  • Another portion 23 of the medium pressure nitrogen gas is sent without overpressure to a tank vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62.
  • the liquid flow 62 is mixed with the reflux flow 9 and the liquid 27 withdrawn at the top of the intermediate pressure column and the mixture is sent to the top of the low pressure column.
  • Bottom liquid from the bottom portion 39 is expanded and fed to the head condenser 59 of the low pressure column 19.
  • the overhead gas 55 from the lower portion 39 is sent to the bottom of the low pressure column and the bottom liquid 53 the tank of the upper part 19 of the low pressure column is sent to the top of the lower part.
  • Gaseous oxygen 41 vaporized in the head condenser 59 against the top nitrogen of the low pressure column is heated in the exchange line 3 to form the product 44.
  • Residual nitrogen 43 taken at the head of the low pressure column is heated in the exchange line 3 to form the flow 45.
  • the top condenser 31 of the intermediate pressure column 25 is fed with the tank liquid 35 of this same column.
  • the liquid is divided in two, a fraction 63 feeding the top condenser of the column 25 and the remainder 64 being expanded and sent to the upper part of the low pressure column 19.
  • the vaporized liquid 61 in the condenser is compressed in a cold booster 85 and sent as flow 66 to the low pressure column at a lower level than the tank liquid inlet 64.
  • the cold booster 85,185 can be driven by an electric motor, mechanically by a medium pressure nitrogen expansion turbine (if present), by the blowing turbine 4 or by a combination of different elements.
  • the blowing turbine 4 can be replaced by a nitrogen turbine, for keeping the appliance cold.

Abstract

In a method for air separation by cryogenic distillation in a three-column system, formed of a medium pressure column (9), an intermediate pressure column (25), and a low pressure column (19, 39) having at least a first and second vaporizer (52, 50), compressed air is sent, purified and cooled, into an exchange line (3) to the medium pressure column; flows enriched with nitrogen and oxygen derived from the medium pressure column are sent to the low pressure column; an oxygen-enriched liquid flow is sent from the medium pressure column to the intermediate pressure column; a first gas containing at least as much nitrogen as the air in the first vaporizer is sent into the low pressure column vat (52); a second gas containing at least as much nitrogen as the air in the second vaporizer (50) is sent to an intermediate level of the low pressure column; an oxygen-rich liquid is sent from the low pressure column vat to a head condenser (31, 59) of the intermediate pressure column or low pressure column; oxygen- and nitrogen-enriched liquids are sent from the intermediate pressure column to the low pressure column; an oxygen-rich gas is collected in the head condenser (31, 59) of the intermediate pressure column or low pressure column; and a nitrogen-rich gas is extracted from the head of the low pressure column.

Description

Procédé et appareil de séparation d'air par distillation cryogénique Method and apparatus for separating air by cryogenic distillation
La présente invention concerne un procédé et un appareil de séparation d'air par distillation cryogénique. L'oxycombustion dans une chaudière permet de faciliter la capture de CO2.The present invention relates to a method and an apparatus for separating air by cryogenic distillation. Oxycombustion in a boiler makes it easier to capture CO 2 .
La consommation énergétique de l'appareil de séparation d'air (ASU) pèse de façon significative sur le rendement global de l'installation. On se propose de réduire la consommation de l'ASU, dans le cas où l'on sait valoriser l'azote sous pression, par exemple par chauffage puis détente dans une turbine chaude (intégration avec chaudière).The energy consumption of the air separation unit (ASU) weighs significantly on the overall efficiency of the installation. It is proposed to reduce the consumption of the ASU, in the case where it is known to valorize nitrogen under pressure, for example by heating and then relaxation in a hot turbine (integration with boiler).
L'invention consiste à utiliser de façon astucieuse un surpresseur froid, de façon à augmenter la pression du résiduaire tout en maintenant la pression d'air ou à réduire la pression d'air de fonctionnement tout en maintenant la pression du résiduaire constante, sur des schémas de type « appareils sous pression ». Selon un objet de l'invention, il est prévu un procédé de séparation d'air par distillation cryogénique dans une installation à trois colonnes, constituées par une colonne moyenne pression, une colonne à pression intermédiaire et une colonne basse pression ayant au moins un premier et un deuxième vaporiseur dans lequel : i) on envoie de l'air comprimé, épuré et refroidi dans une ligne d'échange à la colonne moyenne pression ii) on envoie des débits enrichis en azote et en oxygène dérivés de la colonne moyenne pression à la colonne basse pression iii) on envoie un débit liquide enrichi en oxygène de la colonne moyenne pression à la colonne à pression intermédiaire iv) on envoie un premier gaz contenant au moins autant d'azote que l'air au premier vaporiseur en cuve de la colonne basse pression v) on envoie un deuxième gaz contenant au moins autant d'azote que l'air au deuxième vaporiseur à un niveau intermédiaire de la colonne basse pression vi) on envoie un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête de la colonne à pression intermédiaire ou de la colonne basse pression vii) on envoie des liquides enrichis en oxygène et en azote de la colonne à pression intermédiaire à la colonne basse pression viii) on prélève un gaz riche en oxygène dans le condenseur de tête de la colonne à pression intermédiaire ou de la colonne basse pression et ix) on soutire un gaz riche en azote de la tête de la colonne basse pression.The invention consists in cleverly using a cold booster, so as to increase the pressure of the waste while maintaining the air pressure or to reduce the operating air pressure while maintaining the residual pressure constant, on diagrams of the type "apparatus under pressure". According to an object of the invention, there is provided a process for separating air by cryogenic distillation in a three-column system, constituted by a medium pressure column, an intermediate pressure column and a low pressure column having at least a first pressure column. and a second vaporizer in which: i) compressed, purified and cooled air is sent in an exchange line to the medium pressure column; ii) nitrogen and oxygen enriched flow rates derived from the medium pressure column are sent to the low pressure column iii) is sent an oxygen-enriched liquid flow from the medium pressure column to the intermediate pressure column iv) a first gas containing at least as much nitrogen as air is sent to the first tank vaporizer of the low pressure column v) a second gas containing at least as much nitrogen as the air is sent to the second vaporizer at an intermediate level of the low pressure column vi) is sent a oxygen-rich liquid from the low pressure column vessel to a head condenser of the intermediate pressure column or the low pressure column vii) oxygen and nitrogen enriched liquids are fed from the intermediate pressure column to the low pressure column viii) an oxygen rich gas is withdrawn from the head condenser of the intermediate pressure column or the low pressure column and ix) a nitrogen rich gas is withdrawn from the head of the low pressure column.
Selon d'autres aspects facultatifs :According to other optional aspects:
- on surpresse dans un surpresseur froid au moins le premier gaz contenant au moins autant d'azote que l'air en amont du premier vaporiseur en cuve de la colonne basse pression, on envoie un gaz riche en azote de la tête de la colonne moyenne pression à un troisième vaporiseur dans la colonne basse pression, situé au-dessus du deuxième vaporiseur, le gaz rentrant le troisième vaporiseur substantiellement à la moyenne pression et le deuxième gaz a la même composition que le premier gaz ;- At least the first gas containing at least as much nitrogen as the air upstream of the first vaporizer in the bottom of the low pressure column is overpressed in a cold booster, a nitrogen-rich gas is sent from the top of the middle column. pressure to a third vaporizer in the low pressure column, located above the second vaporizer, the gas entering the third vaporizer substantially at medium pressure and the second gas has the same composition as the first gas;
- on surpresse dans un deuxième surpresseur froid le deuxième gaz contenant au moins autant d'azote que l'air en amont du deuxième vaporiseur ;the second gas containing at least as much nitrogen as the air upstream of the second vaporizer is overpressed in a second cold booster;
- le premier et le deuxième gaz sont des débits d'air ;the first and second gases are air flows;
- le premier et le deuxième gaz sont des débits d'azote ;the first and second gases are nitrogen flow rates;
- on envoie un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête de la colonne basse pression, on envoie un liquide de cuve de la colonne à pression intermédiaire au condenseur de tête de la colonne à pression intermédiaire où le liquide se vaporise au moins partiellement, on surpresse du liquide vaporisé dans un surpresseur froid et on l'envoie à la colonne basse pression.an oxygen rich liquid is sent from the bottom of the low pressure column to a top condenser of the low pressure column, a bottom liquid from the intermediate pressure column is sent to the head condenser of the intermediate pressure column; the liquid vaporises at least partially, the vaporized liquid is boostered in a cold booster and is sent to the low pressure column.
Selon un autre objet de l'invention, il est prévu un appareil de séparation d'air par distillation cryogénique comprenant une installation à trois colonnes, constituées par une colonne moyenne pression, une colonne à pression intermédiaire et une colonne basse pression ayant au moins un premier et un deuxième vaporiseur et : a) des moyens pour envoyer de l'air comprimé, épuré et refroidi dans une ligne d'échange à la colonne moyenne pression b) des moyens pour envoyer des débits enrichis en azote et en oxygène dérivés de la colonne moyenne pression à la colonne basse pression c) des moyens pour envoyer un débit liquide enrichi en oxygène de la colonne moyenne pression à la colonne à pression intermédiaire d) des moyens pour envoyer un premier gaz contenant au moins autant d'azote que l'air au premier vaporiseur en cuve de la colonne basse pression e) des moyens pour envoyer un deuxième gaz contenant au moins autant d'azote que l'air au deuxième vaporiseur à un niveau intermédiaire de la colonne basse pression f) des moyens pour envoyer un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête (31 , 59) de la colonne à pression intermédiaire ou de la colonne basse pression g) des moyens pour envoyer des liquides enrichis en oxygène et en azote de la colonne à pression intermédiaire à la colonne basse pression h) des moyens pour prélever un gaz riche en oxygène dans le condenseur de tête de la colonne à pression intermédiaire ou de la colonne basse pression et i) des moyens pour soutirer un gaz riche en azote de la tête de la colonne basse pression.According to another object of the invention, there is provided an apparatus for separating air by cryogenic distillation comprising a three-column system consisting of a medium pressure column, an intermediate pressure column and a low pressure column having at least one first and second vaporizers and: a) means for sending compressed, purified and cooled air in an exchange line to the medium pressure column; b) means for sending nitrogen and oxygen enriched flow rates derived from the medium pressure column at the low pressure column c) means for sending an oxygen enriched liquid flow from the medium pressure column to the intermediate pressure column; d) means for sending a first gas containing at least as much nitrogen as air to the first tank vaporizer of the low pressure column e) means for sending a second gas containing at least as much nitrogen as air to the second vaporizer at an intermediate level of the low pressure column; f) means for sending an oxygen-rich liquid to the bottom of the vessel; the low pressure column at a top condenser (31, 59) of the intermediate pressure column or the low pressure column; g) means for sending oxygen and nitrogen enriched liquids from the intermediate pressure column to the low column pressure h) means for withdrawing an oxygen-rich gas from the head condenser of the intermediate pressure column or the low pressure column and i) means for withdrawing a gas rich in oxygen. nitrogen from the head of the low pressure column.
Selon d'autres aspects facultatifs, l'appareil comprend :According to other optional aspects, the apparatus comprises:
- un troisième vaporiseur au-dessus du deuxième vaporiseur dans la colonne basse pression, un surpresseur froid, des moyens pour envoyer au surpresseur froid au moins le premier gaz contenant au moins autant d'azote que l'air en amont du premier vaporiseur en cuve de la colonne basse pression, des moyens pour envoyer de l'azote de la colonne moyenne pression au troisième vaporiseur substantiellement à la moyenne pression et des moyens pour diviser un débit de gaz en deux pour former le premier et le deuxième gaz ; - un deuxième surpresseur froid et des moyens pour envoyer au deuxième surpresseur froid le deuxième gaz contenant au moins autant d'azote que l'air en amont du deuxième vaporiseur ;a third vaporizer above the second vaporizer in the low pressure column, a cold booster, means for sending to the cold booster at least the first gas containing at least as much nitrogen as the air upstream of the first tank vaporizer; low pressure column means for sending nitrogen from the medium pressure column to the third vaporizer substantially at medium pressure and means for dividing a gas flow in half to form the first and second gases; a second cold booster and means for sending to the second cold booster the second gas containing at least as much nitrogen as the air upstream of the second vaporizer;
- les moyens pour diviser un débit de gaz pour former le premier et le deuxième sont des moyens pour diviser un débit d'air ; - des moyens pour envoyer de l'air au deuxième vaporiseur (50) à substantiellement la moyenne pression ; - les moyens pour diviser un débit de gaz pour former le premier et le deuxième sont des moyens pour diviser un débit d'azote provenant de la colonne moyenne pression ;- The means for dividing a gas flow to form the first and the second are means for dividing an air flow; means for sending air to the second vaporizer (50) at substantially the medium pressure; - The means for dividing a gas flow to form the first and the second are means for dividing a flow of nitrogen from the medium pressure column;
- au moins une turbine et des moyens pour envoyer de l'azote de la colonne moyenne pression à la (aux) turbine(s) ;at least one turbine and means for sending nitrogen from the medium pressure column to the turbine (s);
- la (chaque) turbine est couplée à un surpresseur froid ;the (each) turbine is coupled to a cold booster;
- des moyens pour envoyer un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête de la colonne basse pression, des moyens pour envoyer un liquide de cuve de la colonne à pression intermédiaire au condenseur de tête de la colonne à pression intermédiaire où le liquide se vaporise au moins partiellement, un surpresseur froid, des moyens pour envoyer du liquide vaporisé dans le surpresseur froid et des moyens pour envoyer le liquide vaporisé surpressé à la colonne basse pression.means for sending an oxygen rich liquid from the bottom of the low pressure column to a top condenser of the low pressure column, means for sending a bottom liquid from the intermediate pressure column to the top condenser of the column at intermediate pressure where the liquid vaporizes at least partially, a cold booster, means for sending vaporized liquid into the cold booster and means for sending the boiled vaporized liquid to the low pressure column.
Cinq appareils selon l'invention seront décrits, en se référant aux Figures 1 à 6.Five devices according to the invention will be described, with reference to FIGS. 1 to 6.
Dans la Figure 1 , on voit une double colonne constituée par une colonne moyenne pression 9, et une colonne basse pression. La colonne basse pression constitue un seul corps et contient trois vaporiseurs. L'installation comprend également une colonne 25 opérant à une pression intermédiaire entre les moyenne et basse pressions, du type communément appelé colonne Etienne.In Figure 1, we see a double column consisting of a medium pressure column 9, and a low pressure column. The low pressure column is a single body and contains three vaporizers. The installation also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column.
Tout l'air 1 est comprimé à une seule pression dans un compresseur principal et traverse la ligne d'échange 3 à cette pression. En aval de la ligne d'échange 3, l'air est divisé en trois parties 13, 14, 1 14. Le débit 13 est envoyé à la cuve de la colonne moyenne pression 9. Le débit 14 est envoyé à un surpresseur froid 85 où il est comprimé. Le débit 1 14 est envoyé à un surpresseur froid 185 où il est comprimé. Le liquide riche 18 de cuve de la colonne moyenne pression 9 est envoyé à la colonne à pression intermédiaire 25 après détente. Un fluide proche en composition de l'air liquide 27 de la colonne moyenne pression 9 est envoyée à la partie supérieure 19 de la colonne basse pression. Le liquide pauvre 17 est envoyé en tête de la partie supérieure 19 de la colonne basse pression après détente. De l'azote gazeux moyenne pression 21 est soutiré en tête de la colonne moyenne pression et est divisé en deux. Une partie 21 se réchauffe partiellement dans la ligne d'échange 3 pour former le débit 90. Ensuite ce débit 90 est détendu dans une turbine 95 pour former le débit détendu 91 et ce débit d'azote détendu 91 se réchauffe en traversant entièrement la ligne d'échange 3. Une autre partie 23 de l'azote gazeux moyenne pression est envoyée à un vaporiseur de cuve 22 de la colonne à pression intermédiaire 25 où elle se condense pour former le débit liquide 62. Le débit liquide 62 est envoyé à la tête de la colonne moyenne pression intermédiaire.All air 1 is compressed at a single pressure in a main compressor and passes through the exchange line 3 at this pressure. Downstream of the exchange line 3, the air is divided into three parts 13, 14, 1 14. The flow 13 is sent to the tank of the medium pressure column 9. The flow 14 is sent to a cold booster 85 where he is compressed. The flow 14 is sent to a cold booster 185 where it is compressed. The rich liquid tank 18 of the medium pressure column 9 is sent to the intermediate pressure column 25 after expansion. A fluid close to the composition of the liquid air 27 of the medium pressure column 9 is sent to the upper part 19 of the low pressure column. The poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion. Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. Part 21 heats up partially in the line exchange 3 to form the flow 90. Then the flow 90 is expanded in a turbine 95 to form the expanded flow 91 and the expanded nitrogen flow 91 is heated through the entire exchange line 3. Another part 23 medium pressure nitrogen gas is sent to a tank vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62. The liquid flow 62 is sent to the head of the intermediate intermediate pressure column.
De l'azote résiduaire 43 pris en tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le débit 45. Le vaporiseur supérieur 152 est chauffé par de l'azote gazeux 150 provenant de la colonne moyenne pression, sans changement de pression. Les deux autres vaporiseurs 50,52 sont chauffés par de l'air surpressé dans deux surpresseurs froids 85,185 connectés en parallèle. Le débit 14 est surpressé dans le surpresseur 85 et envoyé au vaporiseur de cuve 52, le débit 1 14 est surpressé dans le surpresseur 185 et envoyé au vaporiseur intermédiaire 50. L'azote condensé produit dans le vaporiseur supérieur 152 est envoyé en tête de la colonne moyenne pression 9 et l'air condensé produit dans les vaporiseurs 50,52 est envoyé à la colonne moyenne pression 9 au niveau de soutirage du débit 27.Residual nitrogen 43 taken at the top of the low pressure column is heated in the exchange line 3 to form the flow 45. The upper vaporizer 152 is heated with nitrogen gas 150 from the medium pressure column, without pressure change. The other two 50.52 vaporizers are heated by supercharged air in two 85,185 cold boosters connected in parallel. The flow 14 is supercharged in the booster 85 and sent to the tank vaporizer 52, the flow 1 14 is supercharged in the booster 185 and sent to the intermediate vaporizer 50. The condensed nitrogen produced in the upper vaporizer 152 is sent to the top of the medium pressure column 9 and the condensed air produced in the vaporizers 50, 52 is sent to the medium pressure column 9 at the level of withdrawal of the flow 27.
De l'oxygène liquide 37 est soutiré de la cuve de la colonne basse pression 19 et envoyé au condenseur de tête 31 de la colonne à pression intermédiaire. Là il se vaporise pour former le débit 41 qui se réchauffe dans l'échangeur 103 et ensuite dans l'échangeur 3 pour former le produit riche en oxygène du procédé.Liquid oxygen 37 is withdrawn from the tank of the low pressure column 19 and sent to the top condenser 31 of the intermediate pressure column. There it vaporizes to form the flow 41 which is heated in the exchanger 103 and then in the exchanger 3 to form the oxygen-rich product of the process.
Le liquide de cuve 35 de la colonne à pression intermédiaire 25 est envoyé à la colonne basse pression 19. De l'azote liquide 27 est pris en tête de la colonne à pression intermédiaire 25 et envoyé en tête de la colonne basse pression 19. Un débit de purge 42 est soutiré du condenseur 31 .The tank liquid 35 of the intermediate pressure column 25 is sent to the low pressure column 19. Liquid nitrogen 27 is taken at the top of the intermediate pressure column 25 and sent to the top of the low pressure column 19. purge flow 42 is withdrawn from the condenser 31.
Dans la Figure 2, tout l'air est comprimé par un compresseur principal à la moyenne pression, refroidi dans la ligne d'échange 3 et envoyé à la colonne moyenne pression.In Figure 2, all the air is compressed by a main compressor at medium pressure, cooled in the exchange line 3 and sent to the medium pressure column.
Le liquide riche 18 de cuve de la colonne moyenne pression 9 est envoyé à la colonne à pression intermédiaire 25 après détente. Un fluide proche en composition de l'air liquide 27 de la colonne moyenne pression 9 est envoyée à la partie supérieure 19 de la colonne basse pression après Le liquide pauvre 17 est envoyé en tête de la partie supérieure 19 de la colonne basse pression après détente. De l'azote gazeux moyenne pression 21 est soutiré en tête de la colonne moyenne pression et est divisé en deux. Une partie 21 se réchauffe partiellement dans la ligne d'échange 3 pour former le débit 90. Ensuite ce débit 90 est détendu dans une turbine 95 pour former le débit détendu 91 et ce débit d'azote détendu 91 se réchauffe en traversant entièrement la ligne d'échange 3. Une autre partie 23 de l'azote gazeux moyenne pression est envoyée à un vaporiseur de cuve 22 de la colonne à pression intermédiaire 25 où elle se condense pour former le débit liquide 62. Le débit liquide 62 est envoyé à la tête de la colonne moyenne pression intermédiaire.The rich liquid tank 18 of the medium pressure column 9 is sent to the intermediate pressure column 25 after expansion. A close fluid in composition liquid air 27 of the medium pressure column 9 is sent to the upper part 19 of the low pressure column after the poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion. Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 21 is partially heated in the exchange line 3 to form the flow 90. Then this flow 90 is expanded in a turbine 95 to form the expanded flow 91 and this expanded nitrogen flow 91 is heated through the entire line. 3. Another portion 23 of the medium pressure nitrogen gas is sent to a vessel vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62. The liquid flow 62 is sent to the head of the middle intermediate pressure column.
De l'azote résiduaire 43 pris en tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le débit 45. Le vaporiseur supérieur 152 est chauffé par de l'azote gazeux 150 provenant de la colonne moyenne pression, sans changement de pression. Les deux autres vaporiseurs 50,52 sont chauffés par de l'air surpressé dans deux surpresseurs froids 85,185 connectés en parallèle. Le débit 14 est surpressé dans le surpresseur 85 et envoyé au vaporiseur de cuve 52, le débit 1 14 est surpressé dans le surpresseur 185 et envoyé au vaporiseur intermédiaire 50. L'azote condensé produit dans le vaporiseur supérieur 152 est envoyé en tête de la colonne moyenne pression 9 et l'air condensé produit dans les vaporiseurs 50,52 est envoyé à la colonne moyenne pression 9 au niveau de soutirage du débit 27.Residual nitrogen 43 taken at the top of the low pressure column is heated in the exchange line 3 to form the flow 45. The upper vaporizer 152 is heated with nitrogen gas 150 from the medium pressure column, without pressure change. The other two 50.52 vaporizers are heated by supercharged air in two 85,185 cold boosters connected in parallel. The flow 14 is supercharged in the booster 85 and sent to the tank vaporizer 52, the flow 1 14 is supercharged in the booster 185 and sent to the intermediate vaporizer 50. The condensed nitrogen produced in the upper vaporizer 152 is sent to the top of the medium pressure column 9 and the condensed air produced in the vaporizers 50, 52 is sent to the medium pressure column 9 at the level of withdrawal of the flow 27.
De l'oxygène liquide 37 est soutiré de la cuve de la colonne basse pression 19 et envoyé au condenseur de tête 31 de la colonne à pression intermédiaire. Là, il se vaporise pour former le débit 41 qui se réchauffe dans l'échangeur 103 et ensuite dans l'échangeur 3 pour former le produit riche en oxygène du procédé.Liquid oxygen 37 is withdrawn from the tank of the low pressure column 19 and sent to the top condenser 31 of the intermediate pressure column. There, it vaporizes to form the flow 41 which is heated in the exchanger 103 and then in the exchanger 3 to form the oxygen-rich product of the process.
Le liquide de cuve 35 de la colonne à pression intermédiaire 25 est envoyé à la colonne basse pression 19. De l'azote liquide 27 est pris en tête de la colonne à pression intermédiaire 25 et envoyé en tête de la colonne basse pression 19. Un débit de purge 42 est soutiré du condenseur 31 . Dans ce cas, de l'azote moyenne pression soutiré en tête de la colonne moyenne pression 9 est divisé en cinq. Une première partie est surpressée dans un premier surpresseur froid 85 et envoyée au vaporiseur de cuve 52, une deuxième partie est surpressée dans un deuxième surpresseur froid 185 et envoyée au vaporiseur intermédiaire 50 , une troisième partie n'est pas surpressée mais est envoyée au vaporiseur supérieur 151 et la quatrième partie 90 est destinée à la turbine 95 comme dans la Figure 2. La cinquième partie 23 sert à rebouillir la colonne à pression intermédiaire 25.The tank liquid 35 of the intermediate pressure column 25 is sent to the low pressure column 19. Liquid nitrogen 27 is taken at the top of the intermediate pressure column 25 and sent to the top of the low pressure column 19. purge flow 42 is withdrawn from the condenser 31. In this case, medium pressure nitrogen withdrawn at the top of the medium pressure column 9 is divided into five. A first part is supercharged in a first cold booster 85 and sent to the tank vaporizer 52, a second part is supercharged in a second cold booster 185 and sent to the intermediate booster 50, a third part is not overpressed but is sent to the vaporizer upper 151 and the fourth portion 90 is for the turbine 95 as in Figure 2. The fifth portion 23 serves to reboil the intermediate pressure column 25.
Dans la Figure 3 on voit une double colonne constituée par une colonne moyenne pression 9, et une colonne basse pression. La colonne basse pression constitue un seul corps et contient trois vaporiseurs. L'installation comprend également une colonne 25 opérant à une pression intermédiaire entre les moyenne et basse pressions, du type communément appelé colonne Etienne.In Figure 3 we see a double column consisting of a medium pressure column 9, and a low pressure column. The low pressure column is a single body and contains three vaporizers. The installation also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column.
Tout l'air 1 est comprimé à une seule pression correspondant là pression de la colonne 9 dans un compresseur principal et traverse la ligne d'échange 3 à cette pression. En aval de la ligne d'échange 3, l'air est divisé en trois parties 13,14,1 14. Le débit 13 est envoyé à la cuve de la colonne moyenne pression 9. Le débit 14 est envoyé à un surpresseur froid 85 où il est comprimé. Le débit 1 14 à la moyenne pression est envoyé au vaporiseur intermédiaire 50 sans modification de pression. Le liquide riche 18 de cuve de la colonne moyenne pression 9 est envoyé à la colonne à pression intermédiaire 25 après détente. Un fluide proche en composition de l'air liquide 27 de la colonne moyenne pression 9 est envoyée à la partie supérieure 19 de la colonne basse pression. Le liquide pauvre 17 est envoyé en tête de la partie supérieure 19 de la colonne basse pression après détente. De l'azote gazeux moyenne pression 21 est soutiré en tête de la colonne moyenne pression et est divisé en deux. Une partie 90 se réchauffe partiellement dans la ligne d'échange 3. Ensuite une partie de ce débit 90 est détendue dans une turbine 95 pour former le débit détendu 91 et ce débit d'azote détendu 91 se réchauffe en traversant entièrement la ligne d'échange 3. Une autre partie du débit 90 se réchauffe à une température plus élevée que la température d'entrée de la turbine 95 et est envoyée à cette température à une turbine 195. Ensuite elle se réchauffe de nouveau dans l'échangeur 3. Une autre partie 23 de l'azote gazeux moyenne pression est envoyée à un vaporiseur de cuve 22 de la colonne à pression intermédiaire 25 où elle se condense pour former le débit liquide 62. Le débit liquide 62 est envoyé à la tête de la colonne moyenne pression intermédiaire.All the air 1 is compressed at a single pressure corresponding to the pressure of the column 9 in a main compressor and passes through the exchange line 3 at this pressure. Downstream of the exchange line 3, the air is divided into three parts 13,14,1 14. The flow 13 is sent to the tank of the medium pressure column 9. The flow 14 is sent to a cold booster 85 where he is compressed. The flow 14 at medium pressure is sent to the intermediate vaporizer 50 without pressure change. The rich liquid tank 18 of the medium pressure column 9 is sent to the intermediate pressure column 25 after expansion. A fluid close to the composition of the liquid air 27 of the medium pressure column 9 is sent to the upper part 19 of the low pressure column. The poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion. Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 90 is partially heated in the exchange line 3. Then a portion of this flow 90 is expanded in a turbine 95 to form the expanded flow 91 and this expanded nitrogen flow 91 is heated through the entire line of exchange 3. Another portion of the flow 90 is heated to a temperature higher than the inlet temperature of the turbine 95 and is sent at this temperature to a turbine 195. Then it warms up again in the exchanger 3. A other part 23 nitrogen gas medium pressure is sent to a tank vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62. The liquid flow 62 is sent to the head of the intermediate intermediate pressure column.
De l'azote résiduaire 43 pris en tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le débit 45.Residual nitrogen 43 taken at the head of the low pressure column is heated in the exchange line 3 to form the flow 45.
Le vaporiseur supérieur 152 est chauffé par de l'azote gazeux 150 provenant de la colonne moyenne pression, sans changement de pression. Les deux autres vaporiseurs 50,52 sont chauffés par de l'air, dont respectivement un débit surpressé dans le surpresseur froid 85 et un débit non surpressé 1 14. Le débit 14 est surpressé dans le surpresseur 85 et envoyé au vaporiseur de cuve 52, le débit 1 14 n'est pas surpressé et est envoyé au vaporiseur intermédiaire 50. L'azote condensé produit dans le vaporiseur supérieur 152 est envoyé en tête de la colonne moyenne pression 9 et l'air condensé produit dans les vaporiseurs 50,52 est envoyé à la colonne moyenne pression 9 au niveau de soutirage du débit 27. De l'oxygène liquide 37 est soutiré de la cuve de la colonne basse pressionThe upper vaporizer 152 is heated with nitrogen gas 150 from the medium pressure column, without pressure change. The two other vaporizers 50, 52 are heated by air, of which respectively a superpressed flow rate in the cold booster 85 and an unpressurized flow rate 14. The flow 14 is supercharged in the booster 85 and sent to the tank vaporizer 52. the flow 1 14 is not overpressed and is sent to the intermediate vaporizer 50. The condensed nitrogen produced in the upper vaporizer 152 is sent to the top of the medium pressure column 9 and the condensed air produced in the vaporizers 50,52 is sent to the medium pressure column 9 at the level of withdrawal of the flow rate 27. Liquid oxygen 37 is withdrawn from the tank of the low pressure column
19 et envoyé au condenseur de tête 31 de la colonne à pression intermédiaire. Là il se vaporise pour former le débit 41 qui se réchauffe dans l'échangeur 103 et ensuite dans l'échangeur 3 pour former le produit riche en oxygène du procédé.19 and sent to the head condenser 31 of the intermediate pressure column. There it vaporizes to form the flow 41 which is heated in the exchanger 103 and then in the exchanger 3 to form the oxygen-rich product of the process.
Le liquide de cuve 35 de la colonne à pression intermédiaire 25 est envoyé à la colonne basse pression 19.The tank liquid 35 of the intermediate pressure column 25 is sent to the low pressure column 19.
De l'azote liquide 27 est pris en tête de la colonne à pression intermédiaire 25 et envoyé en tête de la colonne basse pression 19. Un débit de purge 42 est soutiré du condenseur 31 .Liquid nitrogen 27 is taken at the top of the intermediate pressure column 25 and sent to the top of the low pressure column 19. A purge flow 42 is withdrawn from the condenser 31.
Dans la Figure 4, on voit une double colonne constituée par une colonne moyenne pression 9, et une colonne basse pression à condenseur de tête 59. La colonne basse pression comprend une partie supérieure 19 et une partie inférieureIn Figure 4, there is shown a double column constituted by a medium pressure column 9, and a low pressure head condenser column 59. The low pressure column comprises an upper portion 19 and a lower portion
39, chaque partie ayant un vaporiseur de cuve 50, 52. L'installation comprend également une colonne 25 opérant à une pression intermédiaire entre les moyenne et basse pressions, du type communément appelé colonne Etienne et ayant un condenseur de tête 31 et un vaporiseur de cuve 22.39, each part having a tank vaporizer 50, 52. The installation also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column and having a head condenser 31 and a vaporizer of tank 22.
De l'air 1 provenant d'un compresseur principal est divisé en deux pour forme un débit 5 et un débit 1 1 . Le débit 5 est surpressé dans un surpresseur chaud 2, refroidi et envoyé au bout chaud d'une ligne d'échange 3 où il se refroidit partiellement pour former le débit 7. Le débit 7 est détendu dans une turbine d'insufflation 4 pour former le débit détendu 6 qui est envoyé à un niveau intermédiaire de la partie supérieure 19 de la colonne basse pression. Le reste de l'air 1 1 se refroidit dans la ligne d'échange 3, étant divisé en deux débits 13, 14 juste en aval du bout froid Le débit 13 est envoyé à la cuve de la colonne moyenne pression 9. Le débit 14 est envoyé au vaporiseur de cuve 52 de la partie inférieure 39 de la colonne basse pression où il se condense pour former le débit 15, est détendu dans une vanne et envoyé à la colonne moyenne pression 9 sous forme liquide.Air 1 from a main compressor is divided in two to form a flow 5 and a flow 1 1. The flow rate 5 is overpressed in a hot booster 2, cooled and sent to the hot end of an exchange line 3 where it cools partially to form the flow 7. The flow 7 is expanded in an insufflation turbine 4 to form the expanded flow 6 which is sent to an intermediate level of the upper part 19 of the low pressure column. The rest of the air 1 1 cools in the exchange line 3, being divided into two flow rates 13, 14 just downstream of the cold end The flow 13 is sent to the tank of the medium pressure column 9. The flow 14 is sent to the tank vaporizer 52 of the lower part 39 of the low pressure column where it condenses to form the flow 15, is expanded in a valve and sent to the medium pressure column 9 in liquid form.
Le liquide riche 18 de cuve de la colonne moyenne pression 9 est envoyé à la partie inférieure de la colonne à pression intermédiaire 25 après détente. Un fluide proche de l'air liquide 27 de la colonne moyenne pression 9 est divisé en deux, une partie 28 étant envoyée à la partie supérieure 19 de la colonne basse pression après détente et une partie 29 étant envoyée à un niveau intermédiaire de la colonne à pression intermédiaire 25 après détente. De façon alternative, le débit 15 après détente est envoyé, en partie vers la colonne moyenne pression 9, en partie vers la colonne à pression intermédiaire 25, en partie vers la colonne basse pression 19 après nouvelle détente (en lieu et place du fluide 27). Le liquide pauvre 17 est envoyé en tête de la partie supérieure 19 de la colonne basse pression après détente. De l'azote gazeux moyenne pression 21 est soutiré en tête de la colonne moyenne pression et est divisé en deux. Une partie 21 se réchauffe dans la ligne d'échange 3 pour former le débit 20.. Une autre partie 23 de l'azote gazeux moyenne pression est envoyée, sans être surpressée, à un vaporiseur de cuve 22 de la colonne à pression intermédiaire 25 où elle se condense pour former le débit liquide 62. Le débit liquide 62 est mélangé avec le débit de reflux 9 ainsi que du liquide 27 soutiré en tête de la colonne à pression intermédiaire et le mélange est envoyé en tête de la colonne basse pression.The rich liquid tank 18 of the medium pressure column 9 is sent to the lower part of the intermediate pressure column 25 after expansion. A fluid close to the liquid air 27 of the medium pressure column 9 is divided in two, a portion 28 being sent to the upper part 19 of the low pressure column after expansion and a portion 29 being sent to an intermediate level of the column at intermediate pressure after relaxation. Alternatively, the flow 15 after expansion is sent, partly to the medium pressure column 9, partly to the intermediate pressure column 25, partly to the low pressure column 19 after further expansion (instead of the fluid 27 ). The poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion. Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 21 is heated in the exchange line 3 to form the flow 20. Another portion 23 of the medium pressure nitrogen gas is sent, without being overpressed, to a tank vaporizer 22 of the intermediate pressure column 25. where it condenses to form the liquid flow 62. The liquid flow 62 is mixed with the reflux flow 9 and the liquid 27 withdrawn at the top of the intermediate pressure column and the mixture is sent to the top of the low pressure column.
Du liquide de cuve de la partie inférieure 39 est détendu et envoyé au condenseur de tête 59 de la colonne basse pression 19. Le gaz de tête 55 de la partie inférieure 39 est envoyé en cuve de la colonne basse pression et le liquide de cuve 53 de la cuve de la partie supérieure 19 de la colonne basse pression est envoyé en tête de la partie inférieure.Bottom liquid from the lower portion 39 is expanded and fed to the head condenser 59 of the low pressure column 19. The overhead gas 55 of the lower portion 39 is sent to the bottom of the low pressure column and the liquid tank 53 of the tank of the upper part 19 of the low pressure column is sent to the top of the lower part.
De l'oxygène gazeux 41 vaporisé dans le condenseur de tête 59 contre l'azote de tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le produit 44.Gaseous oxygen 41 vaporized in the head condenser 59 against the top nitrogen of the low pressure column is heated in the exchange line 3 to form the product 44.
De l'azote résiduaire 43 pris en tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le débit 45.Residual nitrogen 43 taken at the head of the low pressure column is heated in the exchange line 3 to form the flow 45.
Le condenseur de tête 31 de la colonne à pression intermédiaire 25 est alimenté par le liquide de cuve 35 de cette même colonne. Le liquide est divisé en deux, une fraction 63 alimentant le condenseur de tête de la colonne 25 et le reste 64 étant détendu et envoyé à la partie supérieure de la colonne basse pression 19. Le liquide vaporisé 61 dans le condenseur est comprimé dans un surpresseur froide 85 puis envoyé comme débit 66 à la colonne basse pression à un niveau inférieur à l'arrivée de liquide de cuve 64. La puissance frigorifique étant excédentaire (avec un écart au bout froid de la ligne d'échange important), on peut placer le surpresseur froid 85 sans turbiner d'azote moyenne pression ou augmenter l'insufflation (i.e. sans faire de froid supplémentaire).The top condenser 31 of the intermediate pressure column 25 is fed with the tank liquid 35 of this same column. The liquid is divided in two, a fraction 63 feeding the top condenser of the column 25 and the remainder 64 being expanded and sent to the upper part of the low pressure column 19. The vaporized liquid 61 in the condenser is compressed in a booster cold 85 and then sent as flow 66 to the low pressure column at a lower level than the tank liquid inlet 64. The cooling capacity being surplus (with a cold end gap of the important exchange line), we can place the cold booster 85 without medium pressure nitrogen turbine or increase the insufflation (ie without extra cold).
Cependant, on a tout intérêt à augmenter un peu la production de froid pour trouver un optimum énergétique.However, we have every interest in increasing the production of cold a little to find an energy optimum.
Dans la Figure 5, on voit une double colonne constituée par une colonne moyenne pression 9, et une colonne basse pression à condenseur de tête 59. La colonne basse pression comprend une partie supérieure 19 et une partie inférieure 39, chaque partie ayant un vaporiseur de cuve 50, 52. L'installation comprend également une colonne 25 opérant à une pression intermédiaire entre les moyenne et basse pressions, du type communément appelé colonne Etienne et ayant un condenseur de tête 31 et un vaporiseur de cuve 22.FIG. 5 shows a double column constituted by a medium pressure column 9, and a head condenser low pressure column 59. The low pressure column comprises an upper part 19 and a lower part 39, each part having a vaporizer of tank 50, 52. The plant also comprises a column 25 operating at an intermediate pressure between the medium and low pressures, of the type commonly called Etienne column and having a top condenser 31 and a tank vaporizer 22.
De l'air 1 provenant d'un compresseur principal est divisé en deux pour former un débit 5 et un débit 1 1 . Le débit 5 est surpressé dans un surpresseur chaud 2, refroidi et envoyé au bout chaud d'une ligne d'échange 3 où il se refroidit partiellement pour former le débit 7. Le débit 7 est détendu dans une turbine d'insufflation 4 pour former le débit détendu 6 qui est envoyé à un niveau intermédiaire de la partie supérieure 19 de la colonne basse pression. Le reste de l'air 1 1 se refroidit dans la ligne d'échange 3 pour former le débit 12. Le débit entier 12 est envoyé au vaporiseur de cuve 52 de la partie inférieure 39 de la colonne basse pression, sans être surpressé, où il se condense pour former le débit 15, et envoyé à la colonne moyenne pression 9 sous forme partiellement liquide. Cette variante de condensation partielle de l'air en cuve de la colonne basse pression peut être appliquée à l'ensemble des schémas proposés dans ce document.Air 1 from a main compressor is divided in two to form a flow 5 and a flow 1 1. The flow rate 5 is supercharged in a hot booster 2, cooled and sent to the hot end of an exchange line 3 where it cools partially to form the flow 7. The flow 7 is expanded in an insufflation turbine 4 to form the relaxed flow 6 that is sent to a level intermediate of the upper part 19 of the low pressure column. The rest of the air 1 1 cools in the exchange line 3 to form the flow 12. The entire flow 12 is sent to the bottom vaporizer 52 of the lower part 39 of the low pressure column, without being overpressed, where it condenses to form the flow 15, and sent to the medium pressure column 9 in partially liquid form. This variant of partial condensation of the air in the tank of the low pressure column can be applied to all the diagrams proposed in this document.
Le liquide riche 18 de cuve de la colonne moyenne pression 9 est envoyé à la partie inférieure de la colonne à pression intermédiaire 25 après détente. Le liquide pauvre 17 est envoyé en tête de la partie supérieure 19 de la colonne basse pression après détente. De l'azote gazeux moyenne pression 21 est soutiré en tête de la colonne moyenne pression et est divisé en deux. Une partie 21 se réchauffe dans la ligne d'échange 3 pour former le débit 20. Une autre partie 23 de l'azote gazeux moyenne pression est envoyée sans surpression à un vaporiseur de cuve 22 de la colonne à pression intermédiaire 25 où elle se condense pour former le débit liquide 62. Le débit liquide 62 est mélangé avec le débit de reflux 9 ainsi que du liquide 27 soutiré en tête de la colonne à pression intermédiaire et le mélange est envoyé en tête de la colonne basse pression.The rich liquid tank 18 of the medium pressure column 9 is sent to the lower part of the intermediate pressure column 25 after expansion. The poor liquid 17 is sent to the top of the upper part 19 of the low pressure column after expansion. Medium pressure nitrogen gas 21 is withdrawn at the top of the medium pressure column and is divided in two. A portion 21 is heated in the exchange line 3 to form the flow 20. Another portion 23 of the medium pressure nitrogen gas is sent without overpressure to a tank vaporizer 22 of the intermediate pressure column 25 where it condenses to form the liquid flow 62. The liquid flow 62 is mixed with the reflux flow 9 and the liquid 27 withdrawn at the top of the intermediate pressure column and the mixture is sent to the top of the low pressure column.
Du liquide de cuve de la partie inférieure 39 est détendu et envoyé au condenseur de tête 59 de la colonne basse pression 19. Le gaz de tête 55 de la partie inférieure 39 est envoyé en cuve de la colonne basse pression et le liquide de cuve 53 de la cuve de la partie supérieure 19 de la colonne basse pression est envoyé en tête de la partie inférieure.Bottom liquid from the bottom portion 39 is expanded and fed to the head condenser 59 of the low pressure column 19. The overhead gas 55 from the lower portion 39 is sent to the bottom of the low pressure column and the bottom liquid 53 the tank of the upper part 19 of the low pressure column is sent to the top of the lower part.
De l'oxygène gazeux 41 vaporisé dans le condenseur de tête 59 contre l'azote de tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le produit 44.Gaseous oxygen 41 vaporized in the head condenser 59 against the top nitrogen of the low pressure column is heated in the exchange line 3 to form the product 44.
De l'azote résiduaire 43 pris en tête de la colonne basse pression se réchauffe dans la ligne d'échange 3 pour former le débit 45.Residual nitrogen 43 taken at the head of the low pressure column is heated in the exchange line 3 to form the flow 45.
Le condenseur de tête 31 de la colonne à pression intermédiaire 25 est alimenté par le liquide de cuve 35 de cette même colonne. Le liquide est divisé en deux, une fraction 63 alimentant le condenseur de tête de la colonne 25 et le reste 64 étant détendu et envoyé à la partie supérieure de la colonne basse pression 19. Le liquide vaporisé 61 dans le condenseur est comprimé dans un surpresseur froid 85 et envoyé comme débit 66 à la colonne basse pression à un niveau inférieur à l'arrivé de liquide de cuve 64.The top condenser 31 of the intermediate pressure column 25 is fed with the tank liquid 35 of this same column. The liquid is divided in two, a fraction 63 feeding the top condenser of the column 25 and the remainder 64 being expanded and sent to the upper part of the low pressure column 19. The vaporized liquid 61 in the condenser is compressed in a cold booster 85 and sent as flow 66 to the low pressure column at a lower level than the tank liquid inlet 64.
Pour les Figures 4 et 5, il pourrait y avoir une vaporisation partielle du liquide très riche 35,62 dans le condenseur 31 de la colonne à pression intermédiaire 25 : en sortie, il y aurait un séparateur de phases, le gaz du séparateur étant comprimé par un surpresseur froid vers la colonne basse pression et le liquide étant comprimé par une pompe vers la colonne basse pression.For Figures 4 and 5, there could be a partial vaporization of the very rich liquid 35,62 in the condenser 31 of the intermediate pressure column 25: at the outlet, there would be a phase separator, the separator gas being compressed by a cold booster to the low pressure column and the liquid being compressed by a pump to the low pressure column.
La présence du condenseur de tête 59 n'est pas obligatoire pour les Figures 4 à 6.The presence of the overhead condenser 59 is not required for Figures 4 to 6.
Pour les six figures, le surpresseur froid 85,185 peut être entraîné par un moteur électrique, mécaniquement par une turbine de détente azote moyenne pression (si présente), par la turbine d'insufflation 4 ou par une combinaison d'éléments différents. La turbine d'insufflation 4 peut être remplacée par une turbine azote, pour le maintien en froid de l'appareil.For the six figures, the cold booster 85,185 can be driven by an electric motor, mechanically by a medium pressure nitrogen expansion turbine (if present), by the blowing turbine 4 or by a combination of different elements. The blowing turbine 4 can be replaced by a nitrogen turbine, for keeping the appliance cold.
Pour les figures 4, 5 et 6, si on souhaite faire un appareil mono-pression azote, on pourrait ajouter :For FIGS. 4, 5 and 6, if it is desired to make a nitrogen mono-pressure device, one could add:
• Turbiner l'azote moyenne pression vers l'azote résiduaire et comprimer à froid l'azote résiduaire, jusqu'à une pression intermédiaire.• Turbine the medium pressure nitrogen to the residual nitrogen and cold compress the residual nitrogen to an intermediate pressure.
• Turbiner l'azote moyenne pression vers l'azote résiduaire et comprimer à froid l'air vers le vaporiseur de cuve de la colonne basse pression (avec une répartition adéquate de l'énergie entre le deux surpresseurs froid le cas échéant), pour réduire la pression d'air, tout en maintenant constante la pression de l'azote résiduaire.• Turbine the medium pressure nitrogen to the residual nitrogen and cold compress the air to the low pressure column vessel vaporizer (with adequate energy distribution between the two cold boilers if necessary), to reduce the air pressure, while maintaining the pressure of the residual nitrogen constant.
• Turbiner l'azote MP vers l'azote résiduaire et comprimer à froid l'azote moyenne pression vers le vaporiseur de cuve de la colonne basse pression ( Fig 1 ) (avec une répartition adéquate de l'énergie entre les deux surpresseurs froids le cas échéant), pour réduire la pression d'air, tout en maintenant constante la pression de l'azote résiduaire. • Turbine the MP nitrogen to the residual nitrogen and cold compress the medium pressure nitrogen to the bottom column vaporizer (Fig. 1) (with an adequate distribution of energy between the two cold boosters the case if necessary), to reduce the air pressure while maintaining the pressure of the residual nitrogen constant.

Claims

REVENDICATIONS
1 . Procédé de séparation d'air par distillation cryogénique dans une installation à trois colonnes, constituées par une colonne moyenne pression (9), une colonne à pression intermédiaire (25) et une colonne basse pression (19,39) ayant au moins un premier et un deuxième vaporiseur (52,50) dans lequel : i) on envoie de l'air comprimé, épuré et refroidi dans une ligne d'échange (3) à la colonne moyenne pression ii) on envoie des débits enrichis en azote et en oxygène dérivés de la colonne moyenne pression à la colonne basse pression iii) on envoie un débit liquide enrichi en oxygène de la colonne moyenne pression à la colonne à pression intermédiaire iv) on envoie un premier gaz contenant au moins autant d'azote que l'air au premier vaporiseur en cuve (52) de la colonne basse pression v) on envoie un deuxième gaz contenant au moins autant d'azote que l'air au deuxième vaporiseur (50) à un niveau intermédiaire de la colonne basse pression vi) on envoie un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête (31 ,59) de la colonne à pression intermédiaire ou de la colonne basse pression vii) on envoie des liquides enrichis en oxygène et en azote de la colonne à pression intermédiaire à la colonne basse pression viii) on prélève un gaz riche en oxygène dans le condenseur de tête (31 ,59) de la colonne à pression intermédiaire ou de la colonne basse pression et ix) on soutire un gaz riche en azote de la tête de la colonne basse pression.1. Process for the separation of air by cryogenic distillation in a three-column plant, constituted by a medium pressure column (9), an intermediate pressure column (25) and a low pressure column (19,39) having at least a first and a second vaporizer (52, 50) in which: i) compressed, purified and cooled air is sent in an exchange line (3) to the medium pressure column ii) flow rates enriched with nitrogen and oxygen are sent; derived from the medium pressure column at the low pressure column iii) an oxygen enriched liquid flow is sent from the medium pressure column to the intermediate pressure column iv) a first gas containing at least as much nitrogen as the air is sent at the first tank vaporizer (52) of the low pressure column v) a second gas containing at least as much nitrogen as air is sent to the second vaporizer (50) at an intermediate level of the low pressure column vi) is sent liquid rich in oxygen from the tank of the low pressure column to a top condenser (31, 59) of the intermediate pressure column or the low pressure column vii) oxygen and nitrogen enriched fluids of the pressure column are sent intermediate to the low pressure column viii) an oxygen-rich gas is withdrawn from the top condenser (31, 59) of the intermediate pressure column or the low pressure column and ix) a nitrogen-rich gas is withdrawn from the head of the low pressure column.
2. Procédé selon la revendication 1 dans lequel on surpresse dans un surpresseur froid (85) au moins le premier gaz contenant au moins autant d'azote que l'air en amont du premier vaporiseur en cuve (52) de la colonne basse pression, on envoie un gaz riche en azote de la tête de la colonne moyenne pression à un troisième vaporiseur (151 ,152) dans la colonne basse pression, situé au-dessus du deuxième vaporiseur, le gaz rentrant le troisième vaporiseur substantiellement à la moyenne pression et le deuxième gaz a la même composition que le premier gaz. 2. Method according to claim 1 wherein in at least one cold booster (85) is at least the first gas containing at least as much nitrogen as the air upstream of the first bottom evaporator (52) of the low pressure column, a nitrogen-rich gas is fed from the head of the medium pressure column to a third vaporizer (151, 152) in the low pressure column, located above the second vaporizer, the gas returning the third vaporizer substantially to the medium pressure and the second gas has the same composition as the first gas.
3. Procédé selon la revendication 2 dans lequel on surpresse dans un deuxième surpresseur froid (185) le deuxième gaz contenant au moins autant d'azote que l'air en amont du deuxième vaporiseur(δθ).3. Method according to claim 2 wherein in a second cold booster (185) the second gas containing at least as much nitrogen as the air upstream of the second vaporizer (δθ) is overpressed.
4. Procédé selon la revendication 1 , 2 ou 3 dans lequel le premier et le deuxième gaz sont des débits d'air.4. The method of claim 1, 2 or 3 wherein the first and second gases are airflows.
5. Procédé selon la revendication 1 , 2 ou 3 dans lequel le premier et le deuxième gaz sont des débits d'azote.The process of claim 1, 2 or 3 wherein the first and second gases are nitrogen rates.
6. Procédé selon la revendication 1 dans lequel on envoie un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête (59) de la colonne basse pression (19,39), on envoie un liquide de cuve de la colonne à pression intermédiaire (25) au condenseur de tête (31 ) de la colonne à pression intermédiaire où le liquide se vaporise au moins partiellement, on surpresse du liquide vaporisé dans un surpresseur froid (85) et on l'envoie à la colonne basse pression.6. A method according to claim 1 wherein an oxygen rich liquid is sent from the tank of the low pressure column to a head condenser (59) of the low pressure column (19,39), a tank liquid of the intermediate pressure column (25) at the head condenser (31) of the intermediate pressure column where the liquid vaporizes at least partially, is overpressed vaporized liquid in a cold booster (85) and is sent to the column low pressure.
7. Appareil de séparation d'air par distillation cryogénique comprenant une installation à trois colonnes, constituées par une colonne moyenne pression (9), une colonne à pression intermédiaire (25) et une colonne basse pression (19,39) ayant au moins un premier et un deuxième vaporiseur (50,52,151 ,152) et : a) des moyens pour envoyer de l'air comprimé, épuré et refroidi dans une ligne d'échange (3) à la colonne moyenne pression b) des moyens pour envoyer des débits enrichis en azote et en oxygène dérivés de la colonne moyenne pression à la colonne basse pression c) des moyens pour envoyer un débit liquide enrichi en oxygène de la colonne moyenne pression à la colonne à pression intermédiaire d) des moyens pour envoyer un premier gaz contenant au moins autant d'azote que l'air au premier vaporiseur en cuve de la colonne basse pression e) des moyens pour envoyer un deuxième gaz contenant au moins autant d'azote que l'air au deuxième vaporiseur à un niveau intermédiaire de la colonne basse pression f) des moyens pour envoyer un liquide riche en oxygène de la cuve de la colonne basse pression à un condenseur de tête (31 ,59) de la colonne à pression intermédiaire ou de la colonne basse pression g) des moyens pour envoyer des liquides enrichis en oxygène et en azote de la colonne à pression intermédiaire à la colonne basse pression h) des moyens pour prélever un gaz riche en oxygène dans le condenseur de tête (31 ,59) de la colonne à pression intermédiaire ou de la colonne basse pression et i) des moyens pour soutirer un gaz riche en azote de la tête de la colonne basse pression.7. Apparatus for the separation of air by cryogenic distillation comprising a three-column system consisting of a medium pressure column (9), an intermediate pressure column (25) and a low pressure column (19,39) having at least one first and second vaporizers (50, 52, 151, 152) and: a) means for sending compressed, purified and cooled air in an exchange line (3) to the medium pressure column; b) means for sending flow rates enriched with nitrogen and oxygen derived from the medium pressure column at the low pressure column; c) means for sending an oxygen enriched liquid flow from the medium pressure column to the intermediate pressure column; d) means for sending a first gas containing at least as much nitrogen as air in the first tank vaporizer of the low pressure column e) means for sending a second gas containing at least as much nitrogen as air to the second vaporizer at an intermediate level of the low pressure column; f) means for sending an oxygen-rich liquid from the bottom column vessel; pressure at a top condenser (31, 59) of the intermediate pressure column or the low pressure column g) means for supplying oxygen and nitrogen enriched liquids from the intermediate pressure column to the low pressure column h) means for withdrawing an oxygen-rich gas from the head condenser (31, 59) of the intermediate pressure column or the low pressure column and i) means for withdrawing a nitrogen-rich gas from the head of the lower column pressure.
8. Appareil selon la revendication 6 comprenant un troisième vaporiseurApparatus according to claim 6 comprising a third vaporizer
(150,151 ) au-dessus du deuxième vaporiseur (50) dans la colonne basse pression, un surpresseur froid (85), des moyens pour envoyer au surpresseur froid au moins le premier gaz contenant au moins autant d'azote que l'air en amont du premier vaporiseur en cuve (52) de la colonne basse pression (19,39), des moyens pour envoyer de l'azote de la colonne moyenne pression au troisième vaporiseur substantiellement à la moyenne pression et des moyens pour diviser un débit de gaz en deux pour former le premier et le deuxième gaz.(150,151) above the second vaporizer (50) in the low pressure column, a cold booster (85), means for sending to the cold booster at least the first gas containing at least as much nitrogen as the air upstream the first tank vaporizer (52) of the low pressure column (19,39), means for sending nitrogen from the medium pressure column to the third vaporizer substantially at medium pressure and means for dividing a gas flow into two to form the first and the second gas.
9. Appareil selon la revendication 8 comprenant un deuxième surpresseur froid (185) et des moyens pour envoyer au deuxième surpresseur froid le deuxième gaz contenant au moins autant d'azote que l'air en amont du deuxième vaporiseur (50).9. Apparatus according to claim 8 comprising a second cold booster (185) and means for sending to the second cold booster the second gas containing at least as much nitrogen as air upstream of the second vaporizer (50).
10. Appareil selon la revendication 8 ou 9 dans lequel les moyens pour diviser un débit de gaz pour former le premier et le deuxième sont des moyens pour diviser un débit d'air. Apparatus according to claim 8 or 9 wherein the means for dividing a gas flow to form the first and the second are means for dividing an air flow.
1 1 . Appareil selon la revendication 10 comprenant des moyens pour envoyer de l'air au deuxième vaporiseur (50) à substantiellement la moyenne pression.1 1. Apparatus according to claim 10 including means for supplying air to the second vaporizer (50) at substantially the medium pressure.
12. Appareil selon la revendication 8 ou 9 dans lequel les moyens pour diviser un débit de gaz pour former le premier et le deuxième sont des moyens pour diviser un débit d'azote provenant de la colonne moyenne pression.The apparatus of claim 8 or 9 wherein the means for dividing a gas flow to form the first and second are means for dividing a nitrogen flow from the medium pressure column.
13. Appareil selon l'une des revendication 8 à 1 1 comprenant une turbine (95,195) et des moyens pour envoyer de l'azote de la colonne moyenne pression à la turbine.13. Apparatus according to one of claims 8 to 11 comprising a turbine (95.195) and means for sending nitrogen from the medium pressure column to the turbine.
14. Appareil selon la revendication 12 dans lequel la turbine (95,195) est couplée à un surpresseur froid (85,185).Apparatus according to claim 12 wherein the turbine (95, 195) is coupled to a cold booster (85, 185).
15. Appareil selon la revendication 7 comprenant des moyens pour envoyer un liquide riche en oxygène de la cuve de la colonne basse pression (19,39) à un condenseur de tête (31 ) de la colonne basse pression, des moyens pour envoyer un liquide de cuve de la colonne à pression intermédiaire (25) au condenseur de tête (31 ) de la colonne à pression intermédiaire où le liquide se vaporise au moins partiellement, un surpresseur froid (85), des moyens pour envoyer du liquide vaporisé dans le surpresseur froid et des moyens pour envoyer le liquide vaporisé surpressé à la colonne basse pression. Apparatus according to claim 7 comprising means for supplying an oxygen-rich liquid from the low pressure column vessel (19,39) to a head condenser (31) of the low pressure column, means for delivering a liquid of the intermediate pressure column (25) to the head condenser (31) of the intermediate pressure column where the liquid vaporizes at least partially, a cold booster (85), means for sending vaporized liquid into the booster cold and means for sending the pressurized vaporized liquid to the low pressure column.
PCT/FR2009/050495 2008-04-22 2009-03-23 Method and apparatus for air separation by cryogenic distillation WO2009130430A2 (en)

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PCT/FR2009/050495 WO2009130430A2 (en) 2008-04-22 2009-03-23 Method and apparatus for air separation by cryogenic distillation

Applications Claiming Priority (13)

Application Number Priority Date Filing Date Title
FR0852709A FR2930330B1 (en) 2008-04-22 2008-04-22 METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION
FR0852705A FR2930326B1 (en) 2008-04-22 2008-04-22 METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION
FR0852707 2008-04-22
FR0852708 2008-04-22
FR0852705 2008-04-22
FR0852706A FR2930327A1 (en) 2008-04-22 2008-04-22 Air separating method for carbon oxycombustion frame, involves sending oxygen and nitrogen enrich liquids, and reheating nitrogen rich flow from low pressure columns and oxygen rich flow in exchange line
FR0852709 2008-04-22
FR0852707A FR2930328A1 (en) 2008-04-22 2008-04-22 Air separating method for oxycombustion application in boiler, involves sending oxygen and nitrogen enriched liquids to low pressure column, removing oxygen enriched gas in condenser, and drawing nitrogen enriched gas from column
FR0852706 2008-04-22
FR0852710A FR2930331B1 (en) 2008-04-22 2008-04-22 METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION
FR0852708A FR2930329A1 (en) 2008-04-22 2008-04-22 Air separating method, involves sending residual oxygen directly to atmosphere through tower in direct contact with water at hot end of exchange line and cold compressor that uses part of refrigerated power of turbine
FR0852710 2008-04-22
PCT/FR2009/050495 WO2009130430A2 (en) 2008-04-22 2009-03-23 Method and apparatus for air separation by cryogenic distillation

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