EP2691718A2 - Verfahren zur herstellung eines gases aus druckluft durch kryogene destillation - Google Patents

Verfahren zur herstellung eines gases aus druckluft durch kryogene destillation

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Publication number
EP2691718A2
EP2691718A2 EP12717421.7A EP12717421A EP2691718A2 EP 2691718 A2 EP2691718 A2 EP 2691718A2 EP 12717421 A EP12717421 A EP 12717421A EP 2691718 A2 EP2691718 A2 EP 2691718A2
Authority
EP
European Patent Office
Prior art keywords
temperature
air
exchange line
booster
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12717421.7A
Other languages
English (en)
French (fr)
Other versions
EP2691718B1 (de
Inventor
Patrick Le Bot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP2691718A2 publication Critical patent/EP2691718A2/de
Application granted granted Critical
Publication of EP2691718B1 publication Critical patent/EP2691718B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04096—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of argon or argon enriched stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04381—Details relating to the work expansion, e.g. process parameter etc. using work extraction by mechanical coupling of compression and expansion so-called companders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/50—Oxygen or special cases, e.g. isotope-mixtures or low purity O2
    • F25J2215/54—Oxygen production with multiple pressure O2
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/04—Multiple expansion turbines in parallel

Definitions

  • the present invention relates to a method and apparatus for producing pressurized air gas by cryogenic distillation.
  • An object of the invention is to propose an alternative for producing process diagrams making it possible to improve the installation costs of the air separation apparatus for oxygen production between 10 and 16 bar, preferably between 14 and 16 bar. 16 bars, so the order of 15 bars.
  • the state of the art for appliances producing oxygen under pressure of the order of 1 5 bar is constituted by "pump" devices, using a main air compressor at a pressure of about 6 bars, and an air booster compressing a portion of the air flow at a pressure of the order of 35-40 bar.
  • this solution is not available for devices of small sizes, for which the combination of a low flow to boost and a very high discharge pressure leads to a real output flow of the booster too small to be technologically feasible .
  • the proposed solution reduces costs for such devices by using a single air compressor at a moderately high discharge pressure, which offers a competitive advantage over the two previous solutions: compressor uniqueness and avoiding an expensive oxygen compressor.
  • US-A-20050126221 discloses an air separation method according to the preamble of claim 1.
  • two series boosters compress the air at intermediate temperatures of the main exchanger, the inlet temperature of the first booster being hotter than the outlet temperature of the second booster.
  • a refrigeration unit is used to lower the inlet temperature of the second booster, thus increasing the complexity of the process.
  • US-A-20060010912 discloses an air separation process in which medium pressure air is supercharged in two cold booster compressors in series.
  • the two boosters must not be coupled to a turbine, because the process turbines only work during a particular step to make liquid. In nominal operation, the process is kept cold by adding cryogenic liquid.
  • all the air is carried at high pressure (substantially higher than the pressure of the medium pressure column) and purified at this pressure, and then divided into at least two parts. Only a fraction of the air, the fraction subsequently liquefying at the cold end of the main exchange line, undergoes a succession of cryogenic compressions so as to bring this flow rate to a pressure sufficient to allow the vaporization of oxygen at the pressure desired.
  • the rest of the air is expanded in at least one turbine at the pressure of the medium pressure column. At least some of the work done by the air expansion is used for cryogenic compression.
  • a method of air separation by cryogenic distillation in an installation comprising a system of columns (31, 33), including a column (31) operating at the highest pressure called the medium pressure in which:
  • At least a portion of the air supercharged in the first booster is cooled in the exchange line, supercharged by means of at least a second booster to a single stage and sucking at a second intermediate temperature of the exchange line and is sent back to the exchange line where it cools, then liquefies, possibly at the cold end of the exchange line and is sent into the column system after expansion;
  • Another part of the purified air under the high pressure is cooled in the exchange line and then at least partially relaxed in at least two turbines having one or more inlet temperatures which is an intermediate temperature or which are intermediate temperatures of the exchange line and then sent to the column system for separation;
  • the work released by the expansion of the air is used at least partially for the cryogenic compression performed by the first and / or the second booster by coupling the first booster to one of the two turbines and the second booster to the other of the two. turbines;
  • the purified air in the purification unit is sent to the outlet temperature of the purification unit at an exchange line, the liquid oxygen pressurized at a pressure less than or equal to 1 6 bars, preferably between 10 and 16 bars, vaporizes in the exchange line, an energy dissipation device is coupled to at least one of the booster pumps, the first temperature differs from the second temperature by at most 10 ° C and the first and second temperatures are between -145 ° C and -165 ° C.
  • the two turbines have equal or different inlet temperatures constituted by the third intermediate temperature and a fourth intermediate temperature of the exchange line;
  • the third temperature is lower than the first temperature.
  • the third temperature differs from the fourth temperature by at most 20 ° C, or even at most 10 ° C;
  • the first temperature is greater than the second temperature
  • the first temperature is less than or equal to the second temperature
  • part of the air is liquefied at high pressure, preferably in the exchange line;
  • the air of at least one of the turbines is sent to the column operating at the highest pressure
  • the system comprises a double air separation column comprising a first column and a second column operating at a lower pressure than the first, the air expanded in the two turbines (17, 27) being sent to the first column;
  • the first temperature is colder than the outlet temperature of the second booster
  • the outlet temperature (s) of the first and / or second booster is / are between -1 10 ° C and -150 ° C;
  • the outlet temperature (s) of the first and / or second booster is / are between -125 ° C and -145 ° C.
  • an apparatus for separating air by cryogenic distillation comprising a system of columns, a column operating at the highest pressure called the medium pressure, a compressor for compressing all the air at a high pressure, at least 3 bar higher at medium pressure, a purification unit connected to the compressor to purify all the air at high pressure, a pipe to send a constituent part between 10% to 35% purified air under high pressure to cool in a line of exchange, a first booster to a single stage, a second booster to a single stage, a pipe to send the constituent part between 10 and 35% of the air to purify at the first booster at a first intermediate temperature of the exchange line, a pipe for sending at least a portion of the supercharged air into the first booster to cool in the exchange line, a pipe to send that cold part to the second booster at a second intermediate temperature of the exchange line, a conduit for sending air from the second booster to the exchange line to cool, a condu ite to send the cooled air from the second booster compressor of the
  • An air flow is compressed in a main compressor 3 to a pressure at least 3 bar above the pressure of the column 31, which is the medium pressure column of a double distillation air separation column cryogenic.
  • the compressed air is purified in a purification unit 7 to form the purified flow 9.
  • the purified flow is sent to the exchange line January 1 without having been cooled and in the exchange line it cools to a first intermediate temperature. At this temperature, the air is divided into a portion 13 and a portion 14.
  • the portion 13 enters a single first booster 15 having a single stage at the first intermediate temperature where it is supercharged.
  • the supercharged air is sent to the exchange line January 1 where it cools again to a second intermediate temperature, lower than the first intermediate temperature. At this second intermediate temperature, at least Part of the superpressed air in the booster 15 or all the air 13 is supercharged in a single second booster 25 having a single stage.
  • the first intermediate temperature differs from the second temperature by at most 10 ° C and the first and second temperatures range from -145 ° C to -165 ° C.
  • the first intermediate temperature may optionally be greater than or equal to the second intermediate temperature.
  • Each of the outlet temperatures of the boosters 15, 25 is between -10 ° C and -150 ° C, preferably between -125 ° C and -145 ° C.
  • the doubly supercharged flow 13 is returned to the exchange line at the pressure required for the vaporization of a flow of oxygen under pressure.
  • the supercharged flow 13 cools to this pressure to the cold end of the exchange line January 1 and condenses.
  • the flow is expanded, and is sent to the medium pressure column 31.
  • the rest of the air 14 is divided into two or three parts. According to a variant, all the air 14 is divided into two parts.
  • a part 19 is sent to a turbine 17 having an inlet temperature which is a third intermediate temperature of the exchange line, then is sent in gaseous form to the medium pressure column 31.
  • Another part 21 is sent to a turbine 27 having an inlet temperature which is a fourth intermediate temperature of the exchange line, greater than the third temperature, then is sent in gaseous form to the medium pressure column 31.
  • the parts 19, 21 are mixed to form a single flow 23.
  • a part 26 of the air at high pressure can possibly continue to cool down to the cold end of the heat exchanger 11 and condense.
  • the outlet of the exchanger it will be expanded in a valve and sent to the column system, for example to the medium pressure column 31.
  • the double column comprises a medium pressure column 31 and a low pressure column 33, thermally interconnected with reflux rates 39, 41 in a known manner.
  • the low pressure column 33 produces a nitrogen flow 43 which is heated in the exchange line 11. It also produces liquid oxygen 35 in vessel which is pressurized to a pressure between 10 and 16 bar and vaporizes in the exchange line to form gaseous oxygen under pressure.
  • part of the flow 13 can continue cooling to the cold end of the exchanger and not be overpressed by the booster 25. This fraction of flow will condense. At the outlet of the exchanger, it will be expanded in a valve and sent to the column system, for example to the medium pressure column 31.
  • the booster 1 5 is driven at least in part by one of the two turbines 17 or 25, and the booster 25 by the other turbine 25 or 17. In each case, there can also be a motor or a generator coupled to the compressor.
  • An energy dissipating device 22, 24, for example a brake, preferably an oil-brake system, will be integrated with at least one of the two turbine / compressor systems 15/17, 25/27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP12717421.7A 2011-03-31 2012-03-30 Verfahren zur herstellung eines gases aus druckluft durch kryogene destillation Active EP2691718B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1152734A FR2973487B1 (fr) 2011-03-31 2011-03-31 Procede et appareil de production d'un gaz de l'air sous pression par distillation cryogenique
PCT/FR2012/050701 WO2012131277A2 (fr) 2011-03-31 2012-03-30 Procede de production d'un gaz de l'air sous pression par distillation cryogenique

Publications (2)

Publication Number Publication Date
EP2691718A2 true EP2691718A2 (de) 2014-02-05
EP2691718B1 EP2691718B1 (de) 2018-05-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12717421.7A Active EP2691718B1 (de) 2011-03-31 2012-03-30 Verfahren zur herstellung eines gases aus druckluft durch kryogene destillation

Country Status (7)

Country Link
US (1) US20140007617A1 (de)
EP (1) EP2691718B1 (de)
CN (1) CN103827613B (de)
ES (1) ES2675668T3 (de)
FR (1) FR2973487B1 (de)
TR (1) TR201808938T4 (de)
WO (1) WO2012131277A2 (de)

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MX2016001221A (es) * 2013-08-02 2016-05-24 Linde Ag Metodo y dispositivo para producir nitrogeno comprimido.
EP2963371B1 (de) * 2014-07-05 2018-05-02 Linde Aktiengesellschaft Verfahren und vorrichtung zur gewinnung eines druckgasprodukts durch tieftemperaturzerlegung von luft
EP2963369B1 (de) * 2014-07-05 2018-05-02 Linde Aktiengesellschaft Verfahren und vorrichtung zur tieftemperaturzerlegung von luft
EP3101374A3 (de) * 2015-06-03 2017-01-18 Linde Aktiengesellschaft Verfahren und anlage zur tieftemperaturzerlegung von luft
EP3290843A3 (de) * 2016-07-12 2018-06-13 Linde Aktiengesellschaft Verfahren und vorrichtung zur erzeugung von druckstickstoff und flüssigstickstoff durch tieftemperaturzerlegung von luft
WO2020179859A1 (ja) 2019-03-06 2020-09-10 第一三共株式会社 ピロロピラゾール誘導体

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Publication number Publication date
CN103827613A (zh) 2014-05-28
ES2675668T3 (es) 2018-07-11
EP2691718B1 (de) 2018-05-02
CN103827613B (zh) 2016-03-16
FR2973487B1 (fr) 2018-01-26
WO2012131277A2 (fr) 2012-10-04
TR201808938T4 (tr) 2018-07-23
US20140007617A1 (en) 2014-01-09
FR2973487A1 (fr) 2012-10-05
WO2012131277A3 (fr) 2015-08-20

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