EP1298399A1 - Procédé et dispositif de production d'oxygène liquide et d'azote liquide - Google Patents

Procédé et dispositif de production d'oxygène liquide et d'azote liquide Download PDF

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Publication number
EP1298399A1
EP1298399A1 EP02019784A EP02019784A EP1298399A1 EP 1298399 A1 EP1298399 A1 EP 1298399A1 EP 02019784 A EP02019784 A EP 02019784A EP 02019784 A EP02019784 A EP 02019784A EP 1298399 A1 EP1298399 A1 EP 1298399A1
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EP
European Patent Office
Prior art keywords
operating state
gas
heat exchanger
liquefied
oxygen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP02019784A
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German (de)
English (en)
Inventor
Jürgen Voit
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Linde GmbH
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Linde GmbH
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Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP1298399A1 publication Critical patent/EP1298399A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0017—Oxygen
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
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    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
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    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
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    • F25J1/0072—Nitrogen
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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    • F25J1/0075—Oxygen
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    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
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    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
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    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
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    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0234—Integration with a cryogenic air separation unit
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    • F25J1/0235—Heat exchange integration
    • F25J1/0236—Heat exchange integration providing refrigeration for different processes treating not the same feed stream
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    • 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
    • F25J3/04357—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 and comprising a gas work expansion loop
    • 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
    • F25J3/04363—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 oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • 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
    • 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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/50—One fluid being oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/58—One fluid being argon or crude argon
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/04—Internal refrigeration with work-producing gas expansion loop
    • F25J2270/06—Internal refrigeration with work-producing gas expansion loop with multiple gas expansion loops
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/12—External refrigeration with liquid vaporising loop
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/14—External refrigeration with work-producing gas expansion loop
    • F25J2270/16—External refrigeration with work-producing gas expansion loop with mutliple gas expansion loops of the same refrigerant
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/50—Quasi-closed internal or closed external oxygen refrigeration cycle
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/58—Quasi-closed internal or closed external argon refrigeration cycle

Definitions

  • the invention relates to a method for producing liquid oxygen and / or liquid nitrogen, with the gas to be liquefied in a circuit heat exchanger through indirect heat exchange with a circulating medium is liquefied, the circulating medium compressing in a refrigeration cycle, cooled down, relieved of work and / or liquefied, in the circuit heat exchanger warmed and / or evaporated and returned to compression and the circulating medium in a first operating state by a first fluid is formed.
  • Nitrogen liquefaction processes of this type are generally known, for example from DE 2548222 B, DE 3732364 A, EP 316768 A, DE 4030750 A, DE 4303771 A, DE 4418435 A, EP 795727 A or EP 949471 A. From US 5678425 is also known to such a method in two different operating states operate. In one operating state, only liquid nitrogen is produced other liquid nitrogen and liquid oxygen. In both cases air is considered Circulation medium used.
  • the invention has for its object a method of the type mentioned and to provide a corresponding device that is suitable both for the production of liquid oxygen and liquid nitrogen are suitable and especially have low energy consumption.
  • thermodynamic parameter of the two fluids is different, for example Boiling temperature, specific heat of vaporization and / or specific heat.
  • the refrigeration and liquefaction process can optimally match that gas to be liquefied can be adjusted to the lowest possible To achieve energy consumption in liquefaction.
  • first and second operating status can be in the same system different liquid products can be obtained without the Economics of the process have to be compromised. For example 5% less energy is used to generate liquid oxygen, if oxygen, argon or an argon and oxygen as the circulating medium containing mixture is used instead of nitrogen.
  • the gas to be liquefied and the circulating medium preferably have similar ones Boiling points. This means that the boiling points in the in the Liquefaction process occurring pressure by a maximum of 5 K, preferably around differ by a maximum of 3 K.
  • the two media can be the same have chemical composition.
  • the gas to be liquefied and the circulating medium by nitrogen formed whereas in the second operating state oxygen both as and liquefying gas, as well as being used as a circulating medium.
  • argon or at least 80 mol% preferably mixture containing at least 95 mol% of argon is used as the circulating medium become; in practice it is convenient to use a mainly argon and Use oxygen-containing mixture such as raw argon, which is usually in the Raw argon column of a low-temperature air separation plant is manufactured.
  • the gas to be liquefied is preferably made from one in both operating states Air separation plant, in particular a low-temperature air separation plant, taken.
  • a rinsing fraction is passed through the circuit heat exchanger and preferably introduced into a storage container.
  • the rinse fraction can become one later be supplied to the air separation plant. So the Recover the cold content of the rinse fraction and the rinse does not represent a significant one Energy loss.
  • the invention also relates to a device for producing liquid Oxygen and / or liquid nitrogen according to claims 8 to 11.
  • Gas 1 to be liquefied is fed in the method and the device of FIG. 1 under approximately atmospheric pressure via line 2 to a feed gas compressor 3 with aftercooler 4 and compressed there to an intermediate pressure of, for example, 4 to 8 bar, preferably 5 to 6 bar.
  • the circulating medium 6, 7 has the same chemical composition as the gas 1 to be liquefied in both operating states.
  • the two gases are mixed under the intermediate pressure and fed together via line 8 to a circuit compressor 9 with aftercooler 10.
  • There the gas is compressed to a high pressure of, for example, 26 to 32 bar, preferably 28 to 30 bar.
  • a first partial flow 12 of the high pressure gas 11 is in a cycle heat exchanger 13 cooled to a first intermediate temperature and then in a warm turbine 14 relaxed while working to about the intermediate pressure.
  • the relaxed first partial stream of the circulating medium flows via lines 15, 7 and 8 through the circuit heat exchanger 13 to the inlet of the circuit compressor 9 back.
  • a second (22) and third (23) partial flow of high pressure gas 11 are initially together (16) in the series-connected post-compressors 17, 19 with after-coolers 18, 20 to an even higher pressure of, for example, 45 to 60 bar, preferably Brought 48 to 52 bar, which prevails in line 21.
  • the second Partial flow 22 in the circuit heat exchanger 13 to a second, lower one Cooled intermediate temperature and then in a cold turbine 24 relaxed workload to about the intermediate pressure.
  • the resulting two-phase mixture 25 is in an intermediate pressure separator (phase separator) 26th introduced. Steam from the intermediate pressure separator 26 flows over the lines 27, 6 and 8 through the circuit heat exchanger 13 to the inlet of the circuit compressor 9 back.
  • the third partial flow 23 is up to the cold end of the circuit heat exchanger 13 out, then throttle relaxed to about the intermediate pressure (28) and over Line 29 introduced into the intermediate pressure separator (phase separator) 26.
  • the Liquid 30 is further expanded to approximately atmospheric pressure (31) and in one Low-pressure separator 32 is subjected to a further phase separation.
  • the remaining liquid 33 forms the liquid product, while the flash gas over the Lines 34, 35 and 2 through the circuit heat exchanger 13 to the entry of Feed gas compressor 3 flows back.
  • the refrigeration cycle When switching from the first to the second operating state, the refrigeration cycle must be rinsed.
  • the supply of nitrogen gas is first in line 1 ended and instead oxygen is blown into the circuit - initially as Rinse fraction.
  • the connection between the product line 33 and the Consumer or storage for liquid nitrogen interrupted and the liquid instead, passed into a storage tank (not shown) for rinsing liquid. This continues until the desired purity for in the product line 33 the liquid oxygen product is reached. Then the product line 33 with connected to the consumer or storage for liquid oxygen and the second The operating state is reached. (Then the collected Flushing liquid in an air separation plant as described below be processed.) Switching from the second to the first operating state works analog.
  • Both oxygen and nitrogen are in one in the embodiment Low-temperature air separation plant manufactured.
  • This includes one Main heat exchanger 36 and a two-column rectification system with a high-pressure column 37 and low pressure column 38, via a condenser-evaporator (Main condenser) 39 are in heat-exchanging connection (Linde double column).
  • a condenser-evaporator (Main condenser) 39 are in heat-exchanging connection (Linde double column).
  • compressed and cleaned air is the warm end of the Main heat exchanger 36 supplied, cooled there to about dew point temperature and introduced via line 41 into the high pressure column 37.
  • Raw liquid oxygen 42 and liquid nitrogen 43 from the high pressure column 37 or the The main condenser 39 is throttled into the low-pressure column 38 (44, 45).
  • valve 51 When switching over to the second operating state, valve 51 is closed, so that the entire nitrogen product of the air separation plant is gaseous is subtracted (GAN). At the same time the valve 52 is opened and at least one Part of the gaseous oxygen from line 53 via line 1 in the Condensing circuit. This oxygen initially serves as a flushing fraction.
  • the impure liquid (oxygen-nitrogen mixture) accumulating in line 33 during the flushing is as described above in a (not shown) Storage tank caught. As soon as the desired in the product line 33 Oxygen purity is reached, from flushing to the second operating condition switched by the product liquid 33 no longer in the storage container for Flushing liquid, but to a liquid oxygen consumer or storage is directed.
  • the rinsing liquid can gradually flow into the high-pressure column 37 at a suitable point and / or the low pressure column 38 can be fed.
  • Figure 2 largely corresponds to Figure 1. Only the different features are explained in more detail below.
  • an argon-oxygen mixture is used in the second operating state (e.g. about 98 mol% argon and about 2 mol% oxygen containing raw argon) as a circulating medium for the liquefaction of oxygen used.
  • the circuit heat exchanger here has two blocks 13, 213, the Block 213 is designed as a condenser-evaporator.
  • valve 51 When switching from the first to the second operating state, the valve 51 closed so that the entire nitrogen product of the air separation plant is withdrawn in gaseous form (GAN). At the same time, valve 258 is opened and Raw argon flows into the refrigeration circuit via line 259. The raw argon 259 serves initially as a rinse fraction.
  • the impure during line 33 flushing Liquid (argon-oxygen-nitrogen mixture) is as in Figure 1 in a (not illustrated) storage container collected.
  • Desired argon-oxygen content is reached by flushing to alternate second operating state switched by closing valve 254 and valves 255 and 252 are opened.
  • gaseous cold oxygen flows 201 in the condenser-evaporator 213, is liquefied there via line 233 as withdrawn liquid oxygen product and to a liquid oxygen consumer or memory directed (not shown).
  • liquid oxygen liquid circulating medium 256 led into the condenser-evaporator 213, evaporated there and finally flows back via lines 257, 34, 35 and 2 to the feed gas compressor Third
  • the system of Figure 2 can additionally the valve 52 and the corresponding line from Figure 1, via which oxygen can be introduced into the circuit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP02019784A 2001-09-28 2002-09-04 Procédé et dispositif de production d'oxygène liquide et d'azote liquide Withdrawn EP1298399A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10148166 2001-09-28
DE10148166A DE10148166A1 (de) 2001-09-28 2001-09-28 Verfahren und Vorrichtung zur Erzeugung von flüssigem Sauerstoff und flüssigem Stickstoff

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3625509A4 (fr) * 2017-05-16 2021-02-10 Ebert, Terrence, J. Appareil et procédé de liquéfaction de gaz
CN114674112A (zh) * 2022-04-07 2022-06-28 安阳钢铁股份有限公司 一种液化装置氧氮自动转换方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285028A (en) * 1964-01-06 1966-11-15 Air Prod & Chem Refrigeration method
EP0580348A1 (fr) * 1992-07-20 1994-01-26 Air Products And Chemicals, Inc. Liquéfacteur hybride pour air et azote de recyclage
US5337571A (en) * 1991-09-18 1994-08-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and installation for the production of oxygen gas under high pressure by air distillation
US5678425A (en) * 1996-06-07 1997-10-21 Air Products And Chemicals, Inc. Method and apparatus for producing liquid products from air in various proportions
US6220053B1 (en) * 2000-01-10 2001-04-24 Praxair Technology, Inc. Cryogenic industrial gas liquefaction system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285028A (en) * 1964-01-06 1966-11-15 Air Prod & Chem Refrigeration method
US5337571A (en) * 1991-09-18 1994-08-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and installation for the production of oxygen gas under high pressure by air distillation
EP0580348A1 (fr) * 1992-07-20 1994-01-26 Air Products And Chemicals, Inc. Liquéfacteur hybride pour air et azote de recyclage
US5678425A (en) * 1996-06-07 1997-10-21 Air Products And Chemicals, Inc. Method and apparatus for producing liquid products from air in various proportions
US6220053B1 (en) * 2000-01-10 2001-04-24 Praxair Technology, Inc. Cryogenic industrial gas liquefaction system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3625509A4 (fr) * 2017-05-16 2021-02-10 Ebert, Terrence, J. Appareil et procédé de liquéfaction de gaz
US11204196B2 (en) 2017-05-16 2021-12-21 Terrence J. Ebert Apparatus and process for liquefying gases
CN114674112A (zh) * 2022-04-07 2022-06-28 安阳钢铁股份有限公司 一种液化装置氧氮自动转换方法

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