WO1999060316A1 - Liquefying a stream enriched in methane - Google Patents

Liquefying a stream enriched in methane Download PDF

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Publication number
WO1999060316A1
WO1999060316A1 PCT/EP1999/003584 EP9903584W WO9960316A1 WO 1999060316 A1 WO1999060316 A1 WO 1999060316A1 EP 9903584 W EP9903584 W EP 9903584W WO 9960316 A1 WO9960316 A1 WO 9960316A1
Authority
WO
WIPO (PCT)
Prior art keywords
auxiliary
heat exchanger
stream
refrigerant
multicomponent refrigerant
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.)
Ceased
Application number
PCT/EP1999/003584
Other languages
English (en)
French (fr)
Inventor
Hendrik Frans Grootjans
Robert Klein Nagelvoort
Kornelis Jan Vink
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.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EA200001214A priority Critical patent/EA002265B1/ru
Priority to EP99926398A priority patent/EP1088192B1/en
Priority to AU43672/99A priority patent/AU743583B2/en
Priority to IL13951499A priority patent/IL139514A/xx
Priority to BR9910599-3A priority patent/BR9910599A/pt
Priority to US09/700,867 priority patent/US6370910B1/en
Priority to JP2000549892A priority patent/JP4434490B2/ja
Priority to DK99926398T priority patent/DK1088192T3/da
Priority to DE69900758T priority patent/DE69900758T2/de
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Publication of WO1999060316A1 publication Critical patent/WO1999060316A1/en
Priority to NO20005862A priority patent/NO318874B1/no
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • 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
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262—Details of the cold heat exchange system
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
    • 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
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • 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
    • F25J1/003—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
    • F25J1/0055—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 originating from an incorporated cascade
    • 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
    • F25J1/0211—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR 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
    • 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
    • F25J1/0237—Heat exchange integration integrating refrigeration provided for liquefaction and purification/treatment of the gas to be liquefied, e.g. heavy hydrocarbon removal from natural gas
    • F25J1/0238—Purification or treatment step is integrated within one refrigeration cycle only, i.e. the same or single refrigeration cycle provides feed gas cooling (if present) and overhead gas 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
    • 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
    • F25J1/0237—Heat exchange integration integrating refrigeration provided for liquefaction and purification/treatment of the gas to be liquefied, e.g. heavy hydrocarbon removal from natural gas
    • F25J1/0239—Purification or treatment step being integrated between two refrigeration cycles of a refrigeration cascade, i.e. first cycle providing feed gas cooling and second cycle providing overhead gas cooling
    • F25J1/0241—Purification or treatment step being integrated between two refrigeration cycles of a refrigeration cascade, i.e. first cycle providing feed gas cooling and second cycle providing overhead gas cooling wherein the overhead cooling comprises providing reflux for a 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
    • 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
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F25J1/0254—Operation; Control and regulation; Instrumentation controlling particular process parameter, e.g. pressure, temperature
    • 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.
    • F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas
    • 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
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general

Definitions

  • the present invention relates to a method of liquefying a stream that is enriched in methane.
  • This stream is obtained from natural gas, and the product obtained by the method is referred to as liquefied natural gas (LNG) .
  • LNG liquefied natural gas
  • the natural gas stream is cooled in a tube arranged in the auxiliary heat exchanger before it is introduced into the scrub column.
  • the temperature of the cold end of the auxiliary heat exchanger is limited by the temperature of the reflux stream.
  • more heat has to be extracted in the main heat exchanger to liquefy the stream enriched in methane.
  • the method of liquefying a stream enriched in methane according to the present invention is characterized in that partly condensing the gaseous overhead stream is done in a tube arranged in the auxiliary heat exchanger.
  • the temperature of the multicomponent refrigerant withdrawn from the cold end of the auxiliary heat exchanger was also limited by the temperature of the reflux.
  • An advantage of the method of the present invention is that this limitation has been removed. Consequently a lower circulation rate of the multicomponent refrigerant is required.
  • Figure 1 shows schematically a flow scheme of the plant in which the method of the invention is carried out
  • the evaporated multicomponent refrigerant is withdrawn from warm end of the shell side 19 of the main heat exchanger 15 through conduit 25.
  • compressor 27 the multicomponent refrigerant is compressed to elevated refrigerant pressure. Heat of compression is removed using an air cooler 30.
  • the multicomponent refrigerant is passed through conduit 32 to an auxiliary heat exchanger 35.
  • a first tube 38 of the auxiliary heat exchanger 35 the multicomponent refrigerant is partly condensed at elevated refrigerant pressure by indirect heat exchange with an auxiliary multicomponent refrigerant evaporating at low auxiliary refrigerant pressure in the shell side 39 of the auxiliary heat exchanger 35 to obtain multicomponent refrigerant which is passed to the main heat exchanger 17.
  • the multicomponent refrigerant is passed from the first tube 38 through a conduit 42 to a separator 45, where it is separated into a gaseous overhead stream and a liquid bottom stream.
  • the gaseous overhead stream is passed through a conduit 47 to a second tube 49 arranged in the main heat exchanger 17, where the gaseous overhead stream is cooled, liquefied and sub-cooled at elevated refrigerant pressure.
  • the liquefied and sub-cooled gaseous overhead stream is passed through conduit 50 provided with an expansion device in the form of an expansion valve 51 to the cold end of the shell side 19 of the main heat exchanger 17 in which it is allowed to evaporate at low refrigerant pressure.
  • the liquid bottom stream is passed through a conduit 57 to a third tube 59 arranged in the main heat exchanger 17, where the liquid bottom stream is cooled at elevated refrigerant pressure.
  • the cooled liquefied bottom stream is passed through conduit 60 provided with an expansion device in the form of expansion valve 61 to the middle of the shell side 19 of the main heat exchanger 17 in which it is allowed to evaporate at low refrigerant pressure.
  • the evaporating multicomponent refrigerant does not only extract heat from the fluid passing through the first tube 15 in order to liquefy it, but also from the refrigerant passing through the second and the third tube 49 and 59.
  • the auxiliary multicomponent refrigerant evaporated at low auxiliary refrigerant pressure in the shell side 39 of the auxiliary heat exchanger 35 is removed therefrom through conduit 65.
  • compressor 67 the auxiliary multicomponent refrigerant is compressed to elevated auxiliary refrigerant pressure. Heat of compression is removed using an air cooler 70.
  • the auxiliary multicomponent refrigerant is passed through conduit 72 to a second tube 78 arranged in the auxiliary heat exchanger 35 in which it is cooled.
  • the cooled auxiliary multicomponent refrigerant is passed through conduit 80 provided with an expansion device in the form of expansion valve 81 to the cold end of the shell side 39 of the auxiliary heat exchanger 35 in which it is allowed to evaporate at low auxiliary refrigerant pressure .
  • the gaseous overhead stream is supplied through conduit 8 to a third tube 83 arranged in the auxiliary heat exchanger 35.
  • this third tube 83 the gaseous overhead stream is partly condensed.
  • the partly condensed gaseous overhead stream is removed from the third tube 83 and passed via conduit 85 to separator 90.
  • separator 90 a condensate stream is removed to obtain the stream enriched in methane at elevated pressure that is passed through the conduit 10 to the first tube 15 arranged in the main heat exchanger 17.
  • the condensate stream is returned through conduit 91 to the upper part of the scrub column 5 as reflux.
  • the method of the present invention differs from the known method in that in the known method the natural gas stream was cooled in the auxiliary heat exchanger before it was supplied to the scrub column.
  • reflux was obtained from a fractionation unit, and the temperature of this reflux determines the upper limit of the temperature of the cooled natural gas as supplied to the scrub column.
  • the temperature to which the natural gas can be cooled in the known method was about -22 °C in order that it is above the reflux temperature. This means that the lowest temperature that can be obtained at the cold end of the auxiliary heat exchanger is also -22 °C. This is then as well the temperature of the partly condensed multicomponent refrigerant.
  • cooling the natural gas to -22 °C upstream of the scrub column also implies that the process gets less and less efficient, because of the cold removed with the liquid heavier hydrocarbons withdrawn from the bottom of the scrub column .
  • the gaseous overhead stream withdrawn through conduit 8 from the top of the scrub column 5 is partly condensed to a much lower temperature of about -50 °C, and that can be done because it provides the reflux to the scrub column 50.
  • the temperature at the cold end of the auxiliary heat exchanger 35 is much lower than in the known method.
  • the temperature to which the multicomponent refrigerant is cooled is much lower and this results in a lower circulation rate of the multicomponent refrigerant.
  • the natural gas stream is pre-cooled and dried before it enters into the scrub column 5.
  • Pre- cooling is suitably effected by indirect heat exchange with a bleed stream from the auxiliary multicomponent refrigerant passing through conduit 72 downstream of the air cooler 70.
  • the auxiliary multicomponent refrigerant is passed through conduit 93 provided with expansion valve 95 to a heat exchanger 97 arranged in conduit 1.
  • the heat exchanger 97 twice, at first in the conduit 1 and secondly in the circuit between the conduits 72 and 65. However, it is the same heat exchanger .
  • the multicomponent refrigerant is partly condensed in two stages.
  • This embodiment of the present invention will be described with reference to Figure 2.
  • the auxiliary heat exchanger of Figure 2 comprises a first auxiliary heat exchanger 35' and a second auxiliary heat exchanger 35".
  • the multicomponent refrigerant is passed through conduit 32 to the first auxiliary heat exchanger 35'.
  • the multicomponent refrigerant is cooled at elevated refrigerant pressure by indirect heat exchange with an auxiliary multicomponent refrigerant evaporating at intermediate auxiliary refrigerant pressure in the shell side 39' of the first auxiliary heat exchanger 35'. Cooled multicomponent refrigerant is passed through connecting conduit 98 to the second auxiliary heat exchanger 35''.
  • the multicomponent refrigerant is partly condensed at elevated refrigerant pressure by indirect heat exchange with an auxiliary multicomponent refrigerant evaporating at low auxiliary refrigerant pressure in the shell side 39'' of the second auxiliary heat exchanger 35'' to obtain multicomponent refrigerant, which is passed through conduit 42 to the main heat exchanger (not shown in Figure 2) .
  • compressor 67 is a two-stage compressor. In the second stage of the compressor 67, the auxiliary multicomponent refrigerant is compressed to elevated auxiliary refrigerant pressure. Heat of compression is removed using an air cooler 70.
  • the auxiliary multicomponent refrigerant is passed through conduit 72 to a second tube 78' arranged in the first auxiliary heat exchanger 35' in which it is cooled.
  • conduit 80' provided with an expansion device in the form of expansion valve 81' to the cold end of the shell side 39' of the first auxiliary heat exchanger 35' in which it is allowed to evaporate at intermediate auxiliary refrigerant pressure.
  • the evaporating refrigerant extracts heat from the fluids flowing through the tubes 38' and 78' .
  • the remainder of the auxiliary multicomponent refrigerant is passed through connecting conduit 99 to a second tube 78'' arranged in the second auxiliary heat exchanger 35'' in which it is cooled.
  • the cooled auxiliary multicomponent refrigerant is passed through conduit 80'' provided with an expansion device in the form of expansion valve 81'' to the cold end of the shell side 39'' of the second auxiliary heat exchanger 35'' in which it is allowed to evaporate at low auxiliary refrigerant pressure.
  • the evaporating refrigerant extracts heat from the fluids flowing through the tubes 38'' and 78'', and from the gaseous overhead stream withdrawn from the top of the scrub column 5 passing through the third tube 83.
  • Evaporated auxiliary multicomponent refrigerant at low auxiliary refrigerant pressure is removed through conduit 65''.
  • the auxiliary multicomponent refrigerant is compressed to elevated auxiliary refrigerant pressure.
  • the gaseous overhead stream withdrawn from the top of the scrub column 5 is partly condensed in both the first and the second auxiliary heat exchanger 35' and 35''.
  • the natural gas stream is pre-cooled and dried before it enters into the scrub column 5.
  • Pre- cooling is suitably effected by indirect heat exchange with a bleed stream from the auxiliary multicomponent refrigerant passing through conduit 72 downstream of the air cooler 70.
  • the auxiliary multicomponent refrigerant is passed through conduit 93' provided with expansion valve 95 ' to a heat exchanger 97 ' arranged in conduit 1.
  • the air coolers 30 and 70 may be replaced by water coolers and, if required, they or the water coolers can be supplemented by heat exchangers in which a further coolant is used.
  • the expansion valve 61 can be replaced by an expansion turbine.
  • auxiliary heat exchanger(s) 35, 35' and 35'' can be SL 'ound or plate-fin heat exchangers.

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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)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Cyclones (AREA)
PCT/EP1999/003584 1998-05-21 1999-05-20 Liquefying a stream enriched in methane Ceased WO1999060316A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DK99926398T DK1088192T3 (da) 1998-05-21 1999-05-20 Fordråbning af en med methan beriget strøm
EP99926398A EP1088192B1 (en) 1998-05-21 1999-05-20 Liquefying a stream enriched in methane
AU43672/99A AU743583B2 (en) 1998-05-21 1999-05-20 Liquefying a stream enriched in methane
IL13951499A IL139514A (en) 1998-05-21 1999-05-20 Liquefying a stream enriched in methane
BR9910599-3A BR9910599A (pt) 1998-05-21 1999-05-20 Processo para liquefazer uma corrente enriquecida em metano
EA200001214A EA002265B1 (ru) 1998-05-21 1999-05-20 Способ сжижения потока, обогащенного метаном
JP2000549892A JP4434490B2 (ja) 1998-05-21 1999-05-20 メタンに富む流れの液化
US09/700,867 US6370910B1 (en) 1998-05-21 1999-05-20 Liquefying a stream enriched in methane
DE69900758T DE69900758T2 (de) 1998-05-21 1999-05-20 Verflüssigung eines mit methan angereicherten stromes
NO20005862A NO318874B1 (no) 1998-05-21 2000-11-20 Fremgangsmate for vaeskedannelse av en metananriket strom

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98304072 1998-05-21
EP98304072.6 1998-05-21

Publications (1)

Publication Number Publication Date
WO1999060316A1 true WO1999060316A1 (en) 1999-11-25

Family

ID=8234842

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/003584 Ceased WO1999060316A1 (en) 1998-05-21 1999-05-20 Liquefying a stream enriched in methane

Country Status (22)

Country Link
US (1) US6370910B1 (https=)
EP (1) EP1088192B1 (https=)
JP (1) JP4434490B2 (https=)
KR (1) KR100589454B1 (https=)
CN (1) CN1144999C (https=)
AU (1) AU743583B2 (https=)
BR (1) BR9910599A (https=)
DE (1) DE69900758T2 (https=)
DK (1) DK1088192T3 (https=)
DZ (1) DZ2795A1 (https=)
EA (1) EA002265B1 (https=)
EG (1) EG22433A (https=)
ES (1) ES2171087T3 (https=)
GC (1) GC0000016A (https=)
ID (1) ID27003A (https=)
IL (1) IL139514A (https=)
MY (1) MY119750A (https=)
NO (1) NO318874B1 (https=)
PE (1) PE20000397A1 (https=)
TR (1) TR200003425T2 (https=)
TW (1) TW477890B (https=)
WO (1) WO1999060316A1 (https=)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1008823A3 (en) * 1998-12-09 2000-11-15 Air Products And Chemicals, Inc. Dual mixed refrigerant cycle for gas liquefaction
EP1092931A1 (en) * 1999-10-12 2001-04-18 Air Products And Chemicals, Inc. Hybrid cycle for the production of liquefied natural gas
EP1016844A3 (en) * 1998-12-30 2001-04-25 Praxair Technology, Inc. Multiple circuit cryogenic liquefaction of industrial gas with multicomponent refrigerant
US6539747B2 (en) 2001-01-31 2003-04-01 Exxonmobil Upstream Research Company Process of manufacturing pressurized liquid natural gas containing heavy hydrocarbons
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