EP4375602A1 - Verfahren und vorrichtung zur verflüssigung und gegebenenfalls trennung von co2 durch destillation - Google Patents

Verfahren und vorrichtung zur verflüssigung und gegebenenfalls trennung von co2 durch destillation Download PDF

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Publication number
EP4375602A1
EP4375602A1 EP23211892.7A EP23211892A EP4375602A1 EP 4375602 A1 EP4375602 A1 EP 4375602A1 EP 23211892 A EP23211892 A EP 23211892A EP 4375602 A1 EP4375602 A1 EP 4375602A1
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EP
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Prior art keywords
temperature
flow
pressure
feed flow
cooling
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EP23211892.7A
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English (en)
French (fr)
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EP4375602B1 (de
Inventor
Mathieu LECLERC
Richard Dubettier-Grenier
Thomas Morel
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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
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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
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0027—Oxides of carbon, e.g. CO2
    • 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
    • F25J1/0032—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
    • 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
    • F25J1/02—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
    • F25J1/0201—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
    • 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
    • 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
    • F25J1/02—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
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235—Heat exchange integration
    • F25J1/0242—Waste heat recovery, e.g. from heat of compression
    • 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
    • F25J1/02—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
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0296—Removal of the heat of compression, e.g. within an inter- or afterstage-cooler against an ambient heat sink
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0266—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 characterised by the separated product stream separation of carbon dioxide
    • 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
    • F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
    • 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
    • F25J2215/04—Recovery of liquid products
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/80—Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
    • F25J2220/82—Separating low boiling, i.e. more volatile components, e.g. He, H2, CO, Air gases, CH4
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/06—Adiabatic compressor, i.e. without interstage cooling
    • 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
    • F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
    • F25J2260/02—Integration in an installation for exchanging heat, e.g. for waste heat recovery
    • 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
    • F25J2270/02—Internal 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
    • F25J2270/80—Quasi-closed internal or closed external carbon dioxide refrigeration cycle

Definitions

  • the present invention relates to a process and an apparatus for liquefying CO2 and possibly separating CO2 by distillation and/or washing and/or partial condensation.
  • the CO2 flow that is liquefied or separated can contain more than 95% CO2 but also other impurities such as water, oxygen, nitrogen, argon, methane, carbon monoxide , hydrogen, helium etc....
  • CO2 liquefiers using CO2 as a refrigerant involve the use of a cycle compressor followed by liquefaction, or densification in the case of operation beyond the critical pressure of CO2.
  • a significant amount of heat is generated during the compression of CO2 which is typically dissipated in the intermediate exchangers of the compressor as well as during condensation/densification by being transferred to the cooling fluid, typically water or air. It is therefore dissipated without being valued.
  • these dissipated calories can have value in certain cases.
  • they could be used to heat a fluid, for example water for district heating, to preheat boiler water, etc.
  • the invention presents heat recovery solutions with a moderate impact on the electricity consumption of the liquefier.
  • heat recovery in a multi-stage compressor can be achieved by avoiding certain intermediate cooling in order to allow the temperature of the compressed gas to increase.
  • the gas When the gas is hot enough, it can be cooled against the fluid to be heated such as boiler or district heating water.
  • the CO2 is compressed in a multi-stage compressor, at the intermediate inlets corresponding to the different cooling levels of the cold process. Between each floor there is a water cooler. At the compressor outlet, the CO2 increases in density in a water or air cooler then in another exchanger whose cold fluid is a part of the liquid CO2 obtained by expansion of the densified CO2. The rest of the CO2, liquid and therefore partially cooled, is sent to the cold process for sub-cooling against the different flows of CO2 at different pressures which are integrated into the compressor. These flows are therefore also partially cold because they come from the heat exchange with the partially cooled liquid CO2. Thus, they cool the CO2 compressed in the compressor with which they are mixed by direct contact, limiting the temperature rise in the intermediate stages of compression, which makes heat recovery unsuitable.
  • the invention makes it possible to optimize heat exchanges in order to increase the temperature of the fluids returned to the compressor from the coldest part of the process, in order to be able to recover more calories from their compression and the condensation/densification of the CO2 , while having an impact on the compression energy of moderate CO2. It may be considered counterintuitive to reheat before compression, but the impact on compression energy is minimized since recycled flow rates are decreased as more cold is transferred to the densifying CO2.
  • the fluids are heated against the CO2 which is itself cooled by a fluid (for example district heating water) which is at ambient temperature or which is slightly warm (for example at most 40°C). Therefore, taking into account the approach temperatures, the recycled gases are between 20 and 50°C where we recycled between 0°C and 20°C before the implementation of the invention.
  • a fluid for example district heating water
  • the recycled gases are between 20 and 50°C where we recycled between 0°C and 20°C before the implementation of the invention.
  • an apparatus for liquefying and possibly separating a feed flow rich in CO2 comprising a compressor for compressing the feed flow from an initial pressure up to a first pressure greater than 30 bara to obtain a feed flow at the first pressure and a first temperature, a first heat exchanger, fluidly connected to the compressor, to cool the feed flow at the first pressure and the first temperature by indirect heat exchange with a flow of water or oil at a second temperature lower than the first temperature which heats up, to form a feed flow at the first pressure and a third temperature, a second heat exchanger fluidly connected to the first heat exchanger for cooling from the feed flow at the first pressure and the third temperature to form a feed flow at the first pressure and a fourth temperature by heat exchange with at least one flow that is produced by heating a liquid resulting from liquefaction and optionally separating the feed flow, a third heat exchanger fluidly connected to the second heat exchanger for cooling from the feed flow to the first pressure and the fourth temperature by exchange of heat with a flow
  • the supply flow 1 is sent to the input of a stage C2 of a compressor.
  • the gas 1 is mixed with a gas 13 to form a gas which is compressed in the stage C2 to form the flow 7.
  • the flow 7 compressed to a first pressure greater than 30 bara is cooled from a first temperature T1 to a third temperature T2 and cools in a cooler R1 by indirect contact with a fluid at a second temperature, for example water up to an intermediate temperature of at least 40°C (for example between 40 and 60°C, for example 48-52°C) so that the density of the CO2 7 remains relatively low, less than 400kg/m3, the CO2 being cooled to a first temperature.
  • the fluid in chiller R1 can be oil, district heating water or boiler water. The fluid, for example water, from the cooler R1 therefore recovers the heat of compression of the CO2.
  • the CO2 partially cooled by the cooler R1 at the first temperature is sent to a heat exchanger E 1, for example of the plate and fin type exchanger. It cools from the second temperature T2 to a third temperature T3 which is an intermediate temperature of this exchanger E1, lower than the first temperature and then leaves the exchanger to be cooled by a cooler R2 cooled by a fluid at a ambient temperature which is air or water. This ambient temperature is between 5 and 40°C.
  • cooler R2 Since the CO2 has already been cooled by cooler R1, cooler R2 can be smaller and consume less fluid at room temperature.
  • the CO2 cooled to a fourth temperature T4 and condensed or partially densified by the cooler R2 is subcooled in the heat exchanger E1 or in another heat exchanger and then is expanded in a valve V1 to form a two-phase fluid which separates in a liquefaction and separation unit comprising a phase separator S.
  • This separator S produces a gas 9 which is sent to a section B of the liquefaction and possibly separation unit by partial condensation and /or washing and/or distillation.
  • the separator S also produces a liquid, part of which 11 is sent to section B of the liquefaction unit and the remainder 13 vaporizes and heats up in the heat exchanger E1 at a pressure substantially equal to the inlet pressure from floor C2.
  • the liquid 13 can vaporize in the exchanger E1 upstream or downstream of the cooler R2.
  • the vaporized liquid 13 is mixed with the gas 1 as mentioned.
  • Section B produces a final product 23 which is liquid carbon dioxide, generally purer in carbon dioxide than flow 1.
  • the supply flow 1 is sent to the input of a stage C1 of a common compressor comprising n, here four, stages, including two stages CR1, CR2 upstream of the stage C1.
  • Gas 1 is mixed with gas 17 to form gas 3 which is compressed in stage C1 to form flow 5.
  • Flow 5 is mixed with flow 13 and then is sent directly to the final stage C2 without having been cooled.
  • the flow 7 compressed in the two stages up to a first pressure greater than 30 bara, or even greater than 60 bara, is cooled from a first temperature T1 to a second temperature T2 and cools in a cooler R1 by indirect contact with a fluid , for example water up to an intermediate temperature of at least 40°C (for example between 40 and 60°C, for example 48-52°C) so that the density of the CO2 7 remains relatively low , less than 400kg/m3, the CO2 being cooled to a first temperature.
  • the fluid in chiller R1 can be oil, district heating water or boiler water.
  • the fluid, for example water, from the cooler R1 therefore recovers the heat of compression of the CO2.
  • the CO2 partially cooled by the cooler R1 at the first temperature is sent to a heat exchanger, for example of the plate and fin type exchanger. It cools from the second temperature T2 to a third temperature T3 which is an intermediate temperature of this exchanger E1, lower than the first temperature and then leaves the exchanger to be cooled by a cooler R2 cooled by a fluid at an ambient temperature which is air or water. This ambient temperature is between 5 and 40°C.
  • cooler R2 Since the CO2 has already been cooled by cooler R1, cooler R2 can be smaller and consume less fluid at room temperature.
  • the CO2 cooled to a fourth temperature T4 and condensed or partially densified by the cooler R2 is subcooled in the heat exchanger E1 or in another heat exchanger and then is expanded in a valve V1 to form a two-phase fluid which is separates in a liquefaction and separation unit comprising a phase separator S.
  • This separator S produces a gas 9 which is sent to a section B of the liquefaction and possibly separation unit by partial condensation and/or washing and/or distillation.
  • the separator S also produces a liquid, part of which 11 is sent to section B of the liquefaction unit and the remainder 13 vaporizes and heats up in the heat exchanger E1 at a pressure substantially equal to the outlet pressure of floor C1.
  • the liquid 13 can vaporize in the exchanger E1 upstream or downstream of the cooler R2.
  • the vaporized liquid 13 is mixed with the gas 5 as mentioned.
  • Three other gaseous CO2 flow rates 21, 19, 17, at the inlet pressures of stages CR1, CR2 and C1 respectively, coming from section B are heated in the exchanger E1 and are sent to the inlet of stages CR1, CR2 and C1 respectively.
  • the pressure of flow 19 is lower than that of 17.
  • the pressure of flow 21 is lower than that of 19.
  • These gas flows 17, 19, 21 are produced during the liquefaction and/or separation process by washing and/or distillation and/or partial condensation which takes place in section B.
  • At least one of the flow rates 17, 19, 21 can be produced in liquid form, vaporized in section B and sent as gas to the exchanger E1.
  • Section B produces a final product 23 which is liquid carbon dioxide, generally purer in carbon dioxide than flow 1.
  • Gas 21 is compressed in stage CR1 then mixed with gas 19 and sent to the next stage CR2 without intermediate cooling.
  • the compressed gas in the CR2 stage is cooled by a cooler RR1 and then is mixed with the feed flow 1 and the gas 17.
  • the common compressor CR1, CR2, C1, C2 comprises n, here four, stages on the same axis and only n-2, here two, coolers, including an intercooler RR1 between the stages CR2 and C1 and a final cooler R1 in downstream of the last floor C2.
  • FIG.3 shows an alternative process to that of Figure 1 in which only flow 13 is used to cool the gas coming from cooler R2 upstream of valve V1 in exchanger E2.
  • the gases 17, 19, 21 do not pass into the exchanger E2 but are heated in the heat exchanger E1 and are sent respectively upstream of the stage C1, upstream of the stage CR2 and upstream of the floor CR1.
  • at least one of the flow rates 17, 19, 21 can be produced in liquid form, vaporized in section B and sent as gas to the exchanger E1.
  • the exchanger E2 can be of the type allowing heat exchange between only two fluids, for example a tube and shell exchanger.
  • FIG.4 still shows an alternative process of Figure 1 in which the separation unit does not include a phase separator S or valve V1.
  • Unit B is a liquefaction or separation unit by distillation and/or washing and/or partial condensation.
  • the unit also produces gases rich in CO2 14, 17, 19, 21 respectively at pressures between stages C1 and C2, between stages CR2 and C1, between stages CR1 and CR2 and upstream of stage CR1. At least one of the flows 14, 17, 19, 21 is produced in liquid form, vaporized in section B and sent as gas to the exchanger E1.
  • coolers between stages CR1 and CR2 and between stages C1 and C2 are absent while the cooler RR1 and the cooler R1 are present.
  • the presence of the RR1 cooler is also optional.
  • the number of gases heated and recycled each at a different pressure is strictly equal to the number of stages of the compressor. It will be understood that the number of compressor stages may vary.
  • the number of heated gases, each at its pressure can be less than the number of stages, for example equal to n-1, so that for certain stages, no flow is recycled directly upstream of the floor.
  • the outlet pressure of the last stage of compressor C2 can be supercritical.
  • liquefaction will include the densification of a supercritical gas or partial liquefaction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP23211892.7A 2022-11-28 2023-11-24 Verfahren und vorrichtung zur verflüssigung und gegebenenfalls trennung von co2 durch destillation Active EP4375602B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2212380A FR3142538B1 (fr) 2022-11-28 2022-11-28 Procédé et appareil de liquéfaction de CO2 ou de séparation de CO2 par distillation

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EP4375602A1 true EP4375602A1 (de) 2024-05-29
EP4375602B1 EP4375602B1 (de) 2025-06-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6484087A (en) * 1987-09-24 1989-03-29 Jgc Corp Manufacture of liquefied carbon dioxide
RU2376537C1 (ru) * 2008-09-22 2009-12-20 ОАО "Тольяттиазот" Способ ожижения диоксида углерода
US20120027627A1 (en) * 2009-04-01 2012-02-02 David Getze Compressor system for a process gas plant having heat return, and the process gas plant for carbon dioxide gas separation
FR2974167A1 (fr) 2011-04-14 2012-10-19 Air Liquide Procede et appareil de liquefaction d'un gaz
US10415878B2 (en) * 2015-03-23 2019-09-17 Colin NIKIFORUK Industrial and hydrocarbon gas liquefaction

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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CN108709367A (zh) * 2018-05-22 2018-10-26 中石化宁波工程有限公司 一种二氧化碳的液化装置及使用方法

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