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DE1933080B2 - Process for delivering a methane-rich gas to a distribution network - Google Patents

Process for delivering a methane-rich gas to a distribution network

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Publication number
DE1933080B2
DE1933080B2 DE1933080A DE1933080A DE1933080B2 DE 1933080 B2 DE1933080 B2 DE 1933080B2 DE 1933080 A DE1933080 A DE 1933080A DE 1933080 A DE1933080 A DE 1933080A DE 1933080 B2 DE1933080 B2 DE 1933080B2
Authority
DE
Germany
Prior art keywords
methane
natural gas
pressure
distribution network
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE1933080A
Other languages
German (de)
Other versions
DE1933080A1 (en
DE1933080C3 (en
Inventor
Jean-Pierre Saint Mande Buffiere
Maurice Paris Grenier
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR157726A external-priority patent/FR1603033A/en
Application filed by LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Publication of DE1933080A1 publication Critical patent/DE1933080A1/en
Publication of DE1933080B2 publication Critical patent/DE1933080B2/en
Application granted granted Critical
Publication of DE1933080C3 publication Critical patent/DE1933080C3/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—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
    • F25J3/0247—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 CnHm with 4 carbon atoms or more
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
    • C10G5/06—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas by cooling or compressing
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
    • C10K3/06—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by mixing with gases
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • 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
    • F25J3/0204—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 feed stream
    • F25J3/0209—Natural gas or substitute natural gas
    • F25J3/0214—Liquefied 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
    • 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
    • F25J3/0233—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 CnHm with 1 carbon atom or more
    • 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
    • F25J3/0238—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 CnHm with 2 carbon atoms or more
    • 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
    • F25J3/0242—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 CnHm with 3 carbon atoms or more
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/04—Processes or apparatus using separation by rectification in a dual pressure main column system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/70—Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead 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
    • 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
    • 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
    • F25J2215/64—Propane or propylene
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Abgabe eines methanreichen Gases mit erhöhtem Druck an ein Verteilernetz, wobei verflüssigtes Naturgas auf Verteilernetzdruck gebracht, durch Erwärmen verdampft und mit einer gasförmigen Fraktion vermischt wird.The invention relates to a method for delivering a methane-rich gas at increased pressure to a Distribution network, where liquefied natural gas is brought to distribution network pressure and evaporated by heating and mixed with a gaseous fraction.

Methanreiches Naturgas besitz' häufig als solches oder nach vorheriger Fraktionierung unter Abtrennung schwererer Kohlenwasserstoffe als Methan für industrielle oder Haushaltszwecke einen zu hohen Heizwert, weswegen nichtbrennbare Gase, wie Luft oder Stickstoff, d. h. eine gasförmige Fraktion, die flüchtiger als das Methan ist, zugesetzt werden, um den Heizwert zu senken. Wenn man nun solche Gemische nach bekannten Verfahren, wie gemäß der FR-PS 15 01 013 auf den Verteilernetzdruck bringt, benötigt man einen relativ hohen Energieaufwand und einen hohen apparativen Aufwand, da man eine Rektifiziereinrichtung und eine Phasentrenneinrichtung benötigt, wobei nach Abtrennung einer schwereren Kohlenwasserstofffraktion von einer methanreichen Gasfraktion die schwerere Kohlenwasserstoffe enthaltende Fraktion rektifiziert und die dabei gewonnene methanreiche Gasfraktion mit der ersteren methanreichen Gasfraktion vereinigt wird.Methane-rich natural gas is often owned as such or after prior fractionation with separation heavier hydrocarbons than methane for industrial or household purposes too high a calorific value, therefore non-flammable gases such as air or nitrogen, d. H. a gaseous fraction that is more volatile than the methane is to be added to lower the calorific value. If you look at such mixtures known methods, as according to FR-PS 15 01 013 brings to the distribution network pressure, you need one relatively high expenditure of energy and a high expenditure on equipment, since one has a rectifying device and a phase separation device is required, wherein after separation of a heavier hydrocarbon fraction from a methane-rich gas fraction the fraction containing heavier hydrocarbons rectified and the methane-rich gas fraction obtained with the former methane-rich gas fraction is united.

Aus den US-PS 32 85 719 und 29 97 855 sind Einzelmaßnahmen des erfindungsgemäßen Verfahrens an sich bekannt, doch in einem völlig anderen Verfahrensschema und zur Lösung einer anderen Aufgabe.From US-PS 32 85 719 and 29 97 855 individual measures of the method according to the invention are known per se, but in a completely different procedural scheme and to solve a different one Task.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, ein methanreiches Gas mit erhöhtem Druck unter möglichst geringem Energieaufwand und apparativem Aufwand an ein Verteilernetz abzugeben.The object of the invention is to provide a methane-rich gas with increased pressure under to deliver to a distribution network with as little energy and equipment as possible.

Erfindungsgemäß ist das Verfahren zur Abgabe eines methanreichen Gases mit erhöhtem Druck an ein Verteilernetz, wobei verflüssigtes Naturgas auf Verteilernetzdruck gebracht, durch Erwärmen verdampft und mit einer gasförmigen Fraktion vermischt wird, dadurch gekennzeichnet, daß das verflüssigte Naturgas auf einen mittleren Druck komprimiert, die gasförmige Fraktion mit ihm vereinigt, das Gemisch auf Verteilernützdruck gebracht und dann durch Erwärmen verdampft wird.According to the invention, the method for delivering a methane-rich gas at increased pressure to a Distribution network, where liquefied natural gas is brought to distribution network pressure and evaporated by heating and is mixed with a gaseous fraction, characterized in that the liquefied natural gas Compressed to a medium pressure, the gaseous fraction combined with it, the mixture to the distribution pressure brought and then evaporated by heating.

Dieses Verfahren ist mit Hilfe eines Kompressors ίο durchführbar, dessen Verdichtungsverhältnis zwischen Ansaugen und Ausstoßen gering ist, so daß er eine niedrige Anzahl von Verdichtungsstufen aufweist.This method can be carried out with the help of a compressor ίο whose compression ratio is between Suction and discharge is small, so that it has a low number of compression stages.

Die zugemischte gasförmige Fraktion ist gewöhnlich flüchtiger als das Methan und besteht wenigstens teilweise aus nicht brennbaren Gasen, wie Luft oder Stickstoff. Die gasförmige Fraktion kann aber auch ganz oder teilweise aus methanreichen Dämpfen bestehen, die im Druckgleichgewicht mit flüssigem Naturgas stehen, wie etwa die Dämpfe der Entgasung von Vorratsbehältern für Naturgas, die im wesentlichen aus Methan und gegebenenfalls Äthan bestehen.The admixed gaseous fraction is usually more volatile than the methane and at least exists partly from non-flammable gases such as air or nitrogen. The gaseous fraction can also be whole or partly consist of methane-rich vapors that are in pressure equilibrium with liquid natural gas stand, such as the vapors of the degassing of storage containers for natural gas, which essentially consist of Methane and possibly ethane exist.

Bei der Zugabe der gasförmigen Fraktion zu dem auf einen mittleren Druck verflüssigten Naturgas bekommt man insgesamt eine flüssige Phase, indem sich dieWith the addition of the gaseous fraction to the natural gas liquefied to a medium pressure gets a total of a liquid phase by the

2Ί gasförmige Fraktion in dem verflüssigten Naturgas auflöst. Dies wird noch dadurch erleichtert, daß man wenigstens einen Teil der gasförmigen Fraktion vor der Vereinigung mit dem auf mittleren Druck komprimierten verflüssigten Naturgas auf dessen mittleren Druck 2Ί gaseous fraction dissolves in the liquefied natural gas. This is further facilitated by the fact that at least part of the gaseous fraction is brought to the mean pressure of the liquefied natural gas, which has been compressed to mean pressure, before it is combined

JO komprimiert. Weiterhin ist es vorteilhaft, die gasförmige Fraktion vor der Vereinigung mit dem verflüssigten Naturgas zu kühlen, zweckmäßig durch Wärmeaustausch der gasförmigen Fraktion mit einem vom auf Verteilernetzdruck befindlichen Hauptstrom vor dessen Erwärmung und Verdampfung abgezweigten Teilstrom. Zweckmäßig besitzt das Gemisch von gasförmiger Fraktion und verflüssigtem Naturgas nach der Vereinigung eine Temperatur unterhalb der Siedepunkte der Komponenten des Gemisches.JO compressed. It is also advantageous to use the gaseous To cool fraction before combining with the liquefied natural gas, expediently by heat exchange the gaseous fraction with a main stream at the distribution network pressure in front of it Heating and evaporation branched off partial flow. The mixture expediently has gaseous Fraction and liquefied natural gas after combining a temperature below the boiling point of the Components of the mixture.

'» Selbstverständlich kann die mit dem verflüssigten Naturgas zu vereinigende gasförmige Fraktion bereits aus einer anderen Vorrichtung mit der geeigneten Temperatur und dem geeigneten Druck in das vorliegende Verfahren eingeführt werden.'' Of course the one with the liquefied one can Natural gas to be combined gaseous fraction already from another device with the appropriate one Temperature and the appropriate pressure are introduced into the present process.

Die Zeichnung zeigt in schematischer Weise eine Ausführungsform des erfindungsgemäßen Verfahrens, bei der ein unter niedrigem Druck stehendes verflüssigtes Naturgas unter Zusatz von Stickstoff zur Senkung seines Heizwertes auf den Verteilernetzdruck gebracht wird.The drawing shows schematically an embodiment of the method according to the invention, in which a liquefied natural gas under low pressure with the addition of nitrogen for lowering its calorific value is brought to the distribution network pressure.

Das verflüssigte Naturgas, das durch die Leitung 101 ankommt, wird über eine Pumpe 102 und über die Leitung 103 in eine Leitung 127 eingeführt, in welcher es mit einer gasförmigen Fraktion vereinigt wird, die über die Leitung 125 zugeführt wird. Die gasförmige Fraktion besteht aus gasförmigem Stickstoff der über die Leitung 119 zuströmt, und aus Entgasungsdämpfen der nicht dargestellten Vorratsbehälter des verflüssigten Naturgases, die über die Leitung 120 zugeführt werden. Diese gasförmige Fraktion wird über den Verdichter 121 auf einen mittleren Druck verdichtet, dann über die Leitung 12Ώ einem Austauscher 104 zugeführt, in welchem sie in die Nähe der Temperatur des flüssigen Naturgases abgekühlt wird. Sie verläßt diesen Austauscher durch die Leitung 125. Das methanreiche verflüssigte Gasgemisch in der Leitung 127 wird durch eine Pumpe 129 auf den Enddruck des Verteilernetzes verdichtet und in dem Austauscher 131 durch Wärmeaustausch mit einemThe liquefied natural gas arriving through line 101 is introduced via a pump 102 and via line 103 into a line 127 , in which it is combined with a gaseous fraction which is fed via line 125. The gaseous fraction consists of gaseous nitrogen, which flows in via line 119 , and of degassing vapors from the storage containers (not shown) of the liquefied natural gas, which are supplied via line 120. This gaseous fraction is compressed to a medium pressure via the compressor 121 , then fed via the line 12Ώ to an exchanger 104 , in which it is cooled to near the temperature of the liquid natural gas. It leaves this exchanger through line 125. The methane-rich liquefied gas mixture in line 127 is compressed by a pump 129 to the final pressure of the distribution network and in the exchanger 131 by heat exchange with a

äußeren Wasserkreislauf 132 bei ungefähr 0°C vollständig vergast, bevor es über eine Leitung 133 einer nicht gezeigten Verteilerleitung zugeführt wird.Outer water circuit 132 is completely gasified at approximately 0 ° C. before it is fed via a line 133 to a distribution line (not shown).

Eine Fraktion des mit der Pumpe 129 verdichteten methanreichen verflüssigten Gases wird über eine Zweigleitung 143 in den Wärmetauscher 104 geleitet, bevor sie über die Leitung 144 dem methanreichen verdampften Gas in der Leitung 133 zugeführt wird.A fraction of the methane-rich liquefied gas compressed by the pump 129 is passed via a branch line 143 into the heat exchanger 104 before it is fed via the line 144 to the methane-rich vaporized gas in the line 133.

Beispielexample

Ein verflüssigtes Naturgas mit einer Temperatur von -162°C und einem Druck von 1 ata, das 93,15 Vol.-°/o Methan, 0,40 Vol.-% Stickstoff, 5,95 Vol.-% Äthan, 0,40 Vol.-°/o Propan und 0,i0 Vol.-% Butan enthielt, wurde über die Pumpe 102 bei einem mittleren Druck von 3,5 ata in die Leitung 103 gebracht, in welcher es eine Temperatur von — 161,4°C hatte. Dann wurde es durch die Leitung 127 geführt, in welcher es mit einer gasförmigen Mischung von Stickstoff und methanreichen Entgasungsdämpfen, die aus der Leitung 125 kamen, bei — 1400C gemischt wurde.A liquefied natural gas with a temperature of -162 ° C and a pressure of 1 ata, the 93.15 vol .-% methane, 0.40 vol .-% nitrogen, 5.95 vol .-% ethane, 0, 40% by volume of propane and 0.1% by volume of butane was brought into line 103 via pump 102 at a mean pressure of 3.5 ata, in which the temperature was -161.4 ° C had. Then it was passed through the line 127, in which it, with a gaseous mixture of nitrogen and methane-rich Entgasungsdämpfen coming from the conduit 125 at - 140 0 C was mixed.

Das verflüssigte methanreiche Gasgemisch, welches in der Leitung 127 erhalten wurde, hatte eine Temperatur von — 157,8° C, d. h. eine Temperatur etwas unterhalb des Siedepunktes. Dieses verflüssigte Gas wurde durch die Pumpe 129, die es auf Verteilernetzdruck brachte, in die Leitung 142 befördert, in der es dann eine Temperatur von - 147°C hatte. Von dort wurde das verflüssigte Gas über die Leitung 130 durch den Wärmeaustauscher 131 geleitet, in dem es durch Wärmeaustausch mit einem äußeren Wasserkreislauf 132 verdampft und auf 00C erwärmt wurde. Dann verließ es die Einrichtung durch die Leitung 133. Eine Abzweigung 143 gestattete in dem Wärmeaustauscher 104 die Verdampfung eines kleinen Teiles des verflüssigten Naturgases, und dieser verdampfte Anteil wurde durch die Leitung 144 zu der Leitung 133 geführt. In dem Austauscher 104 wurde die gasförmigeThe liquefied methane-rich gas mixture which was obtained in line 127 had a temperature of -157.8 ° C., ie a temperature slightly below the boiling point. This liquefied gas was conveyed by the pump 129, which brought it to the distribution network pressure, into the line 142 , in which it then had a temperature of -147 ° C. From there, the liquefied gas was passed via line 130 through heat exchanger 131 , in which it was evaporated by heat exchange with an external water circuit 132 and heated to 0 ° C. It then left the facility through line 133. A branch 143 allowed a small portion of the liquefied natural gas to evaporate in heat exchanger 104 , and this evaporated portion was conducted through line 144 to line 133 . In the exchanger 104 the gaseous

ίο Mischung aus der Leitung 122 durch Wärmeaustausch mil dem Anteil des verflüssigten Naturgases auf — 140°C von der Hauptleitung 142 abgezweigten Anteil des verflüssigten Naturgases abgekühlt. Die gekühlte gasförmige Mischung verließ den Austauscher durch dieίο Mixture from line 122 cooled by heat exchange with the portion of the liquefied natural gas to - 140 ° C portion of the liquefied natural gas branched off from the main line 142. The cooled gaseous mixture left the exchanger through the

ι? Leitung 125. ι? Line 125.

Die in dem Verfahren verwendete zuzumischende gasförmige Fraktion bestand aus Stickstoff aus Leitung 119 in einem volumetrischen Anteil von 6%. bezogen auf das in Leitung 133 strömende Gas, und aus den durch die Leitung 120 ankommenden Dämpfen in einem volumetrischen Anteil von 0,5%, bezogen auf das in der Leitung 133 fließende Gas. Die Dämpfe in Leitung 120 waren Entgasungsdämpfe aus den Vorratsbehältern des Naturgases und bestanden im wesentlichen aus MethanThe gaseous fraction to be admixed used in the process consisted of nitrogen from line 119 in a volumetric proportion of 6%. based on the gas flowing in line 133 , and from the vapors arriving through line 120 in a volumetric proportion of 0.5%, based on the gas flowing in line 133. The vapors in line 120 were degassing vapors from the natural gas storage tanks and consisted essentially of methane

2ϊ (und Äthan in geringen Anteilen). Die Mischung aus Stickstoff und methanreichen Dämpfen wurde im Druckgleichgewicht mit dem verflüssigten Naturgas in dem Verdichter 121 vor Eintritt in die Leitung 322 verdichtet.2ϊ (and ethane in small proportions). The mixture of nitrogen and methane-rich vapors was compressed in pressure equilibrium with the liquefied natural gas in the compressor 121 before entering the line 322 .

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (4)

Patentansprüche:Patent claims: 1. Verfahren zur Abgabe eines methanreichen Gases mit erhöhtem Druck an ein Verteilernetz, wobei ein verflüssigtes Naturgas auf Verteilernetzdruck gebracht, durch Erwärmen verdampft und mit einer gasförmigen Fraktion vermischt wird, dadurch gekennzeichnet, daß das verflüssigte Naturgas auf einen mittleren Druck komprimiert, die gasförmige Fraktion mit ihm vereinigt, das Gemisch auf Verteilernetzdruck gebracht und dann durch Erwärmen verdampft wird.1. Process for delivering a methane-rich gas at increased pressure to a distribution network, whereby a liquefied natural gas is brought to distribution network pressure, evaporated by heating and with a gaseous fraction is mixed, characterized in that the liquefied Natural gas is compressed to a medium pressure, the gaseous fraction is combined with it, the mixture brought to distribution network pressure and then evaporated by heating. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die gasförmige Fraktion vor der Vereinigung mit dem verflüssigten Naturgas gekühlt wird.2. The method according to claim 1, characterized in that the gaseous fraction before Association with the liquefied natural gas is cooled. 3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß wenigstens ein Teil der gasförmigen Fraktion vor der Vereinigung mit dem auf mittleren Druck komprimierten verflüssigten Naturgas auf dessen mittleren Druck komprimiert wird.3. The method according to claim 1 and 2, characterized in that at least part of the gaseous fraction before combining with the liquefied fraction compressed to medium pressure Natural gas is compressed to its mean pressure. 4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die gasförmige Fraktion durch Wärmeaustausch mit einem vom auf Verteilernetzdruck befindlichen Hauptstrom vor dessen Erwärmung und Verdampfung abgezweigten Teilstrom gekühlt wird.4. The method according to claim 1 to 3, characterized in that the gaseous fraction by Heat exchange with a main flow from the distribution network pressure before it is heated and evaporation branched off partial flow is cooled.
DE1933080A 1968-07-03 1969-06-30 Process for delivering a methane-rich gas to a distribution network Expired DE1933080C3 (en)

Applications Claiming Priority (2)

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FR157726A FR1603033A (en) 1968-07-03 1968-07-03 Production of high methan gas
FR166509A FR95809E (en) 1968-07-03 1968-09-17 Process for the production under high pressure of a gas rich in methane with the addition of a volatile gas fraction.

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DE1933080B2 true DE1933080B2 (en) 1978-06-22
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US7299655B2 (en) 2003-12-15 2007-11-27 Bp Corporation North America Inc. Systems and methods for vaporization of liquefied natural gas
EP1741971A3 (en) 2005-06-01 2011-07-20 Shell Internationale Research Maatschappij B.V. Method and apparatus for treating LNG
EP2796763A1 (en) * 2013-04-25 2014-10-29 Linde Aktiengesellschaft Method and facility for preparing a conditioned fuel gas
JP7330446B2 (en) * 2019-05-24 2023-08-22 レール・リキード－ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード An extraction system for extracting natural gas liquids (NGL) from liquefied natural gas (LNG)

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US2730870A (en) * 1950-06-15 1956-01-17 Air Prod Inc Method and apparatus for pumping volatile liquids
DE1045434B (en) * 1957-06-15 1958-12-04 Linde Eismasch Ag Method and device for delaying the increase in pressure and reducing gas losses when storing and / or transporting liquid that boils at low temperatures
GB883390A (en) * 1959-08-20 1961-11-29 British Oxygen Co Ltd Apparatus for storing and dispensing liquefied gases
US3285719A (en) * 1963-05-23 1966-11-15 Ofw xx
FR1501013A (en) * 1966-09-13 1967-11-10 Air Liquide Process for the production of a gas rich in methane under high pressure from liquid natural gas under low pressure

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DE1933080C3 (en) 1984-12-20
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