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WO2001040413A1 - Stockage de gaz naturel - Google Patents

Stockage de gaz naturel Download PDF

Info

Publication number
WO2001040413A1
WO2001040413A1 PCT/AU2000/001481 AU0001481W WO0140413A1 WO 2001040413 A1 WO2001040413 A1 WO 2001040413A1 AU 0001481 W AU0001481 W AU 0001481W WO 0140413 A1 WO0140413 A1 WO 0140413A1
Authority
WO
WIPO (PCT)
Prior art keywords
natural gas
reservoir
liquefied natural
gas
boil
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/AU2000/001481
Other languages
English (en)
Inventor
Robert Amin
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.)
Metasource Pty Ltd
Woodside Energy Ltd
Original Assignee
Metasource Pty Ltd
Woodside Energy Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metasource Pty Ltd, Woodside Energy Ltd filed Critical Metasource Pty Ltd
Priority to AU18441/01A priority Critical patent/AU1844101A/en
Publication of WO2001040413A1 publication Critical patent/WO2001040413A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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 OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04

Definitions

  • the present invention relates to the storage of natural gas. More particularly, the present invention relates to the storage of liquefied natural gas and the retention of the boil off gas that results from such storage.
  • natural gas shall be taken as including natural gas, petroleum gas, butane, propane, ethane and like fuel gasses.
  • natural gas hydrate shall be taken as including hydrates formed from natural gas, associate gas, butane, propane, ethane, methane and like fuel gasses
  • Liquefied natural gas or "LNG” is conventionally stored as an extremely cold liquid under one atmospheric pressure and at -161 °C. With the transfer of heat to the stored LNG the temperature of the LNG will rise to its boiling point. However, such heat will be dissipated as latent heat as a result of the boiling of the LNG which, in the absence of further heat input, will lower the temperature. This phenomenon is called auto-refrigeration and necessitates the removal of the boil off gas from above the LNG to maintain a substantially constant pressure above the LNG The amount of boil off gas generated can be of the order of 1 -5% of the volume of LNG per day.
  • the boil-off gas is reliquefied, by cooling and pressu ⁇ sation, before being reintroduced to the storage vessel.
  • This process is carried out continuously, is energy intensive and as a result presents a significant economic impediment to the storage and transportation of LNG, particularly in the Tropics and sub-Tropics.
  • It an object of the present invention to provide a more efficient means of storing LNG.
  • a method for the storage of natural gas comprising:
  • the liquefied natural gas is used to cool the boil off gas and the water used to form the natural gas hydrate.
  • the boil-off gas is cooled by utilising a heat exchanger that utilises liquefied natural gas extracted from the reservoir as the heat exchange medium.
  • the water is cooled by utilising a heat exchanger that utilises liquefied natural gas extracted from the reservoir as the heat exchange medium.
  • the liquefied natural gas used to cool the boil-off gas and the water is returned to the liquefied natural reservoir.
  • the liquefied natural gas used to cool the boil-off gas and the water is vaporised for storage as compressed natural gas and/or delivery for consumption.
  • a natural gas storage facility comprising an insulated reservoir adapted to store liquefied natural gas, an extraction means for the extraction of boil off gas from the reservoir to maintain the pressure above the liquefied natural gas substantially constant, and a hydrate production means which utilises the boil-off gas for the production of natural gas hydrate.
  • the facility further comprises a heat exchanger which is connected to the extraction means to cool the boil off gas prior to its delivery to the hydrate production means.
  • the heat exchanger is used to cool water which is to be used in the production of the natural gas hydrate.
  • the heat exchanger utilises liquefied natural gas drawn from the reservoir as the heat exchange medium.
  • the outlet for the heat exchange medium from the heat exchanger is adapted to deliver the liquefied natural gas to the reservoir.
  • the outlet for the heat exchange medium from the heat exchanger is adapted to deliver the liquefied natural gas to a vaporiser.
  • the liquefied natural gas in the reservoir is used as a heat exchange medium in the hydrate production means.
  • the heat exchange medium is returned to the reservoir.
  • the heat exchange medium is delivered to a vaporiser.
  • the embodiment is directed to a storage facility for liquefied natural gas.
  • the storage facility which is illustrated schematically in the accompanying drawing comprises a substantially conventional storage reservoir 10 for storing LNG at a substantially constant pressure and temperature at most equal to its boiling point at that pressure.
  • the boil off gas is extracted through a vapour outlet 12 in the reservoir. According to conventional practice the extracted boil off gas is liquefied and returned to the reservoir.
  • the reservoir is associated with a facility 20 for the production of natural gas hydrate from the boil off gas.
  • the outlet 12 is connected to a compressor 14 which is in turn connected to a first heat exchanger 16 which is intended to cool the boil off gas.
  • the water which is required to for the natural gas hydrate production is cooled under pressure in a second heat exchanger 18.
  • the cooled boil off gas and water is then delivered to a reactor 20 to form natural gas hydrate which is stored in association with the LNG.
  • the formation of the natural gas hydrate may be in accordance with the methods which are the subject of co-pending International patent applications PCT/AUOO/00719 and PCT/AU00/00973.
  • the heat exchange medium of both the first and the second heat exchangers 16 and 18 comprises LNG which is extracted from the reservoir 10 through a delivery line 22.
  • the heat exchange medium (LNG) which is exhausted from the heat exchangers through the exhaust line 24 can be returned to the reservoir 10 through a first valve 26 where the returned LNG will be cooled by the ever present auto-refrigeration which is a characteristic of LNG storage.
  • the heat exchange medium (LNG) which is exhausted from the heat exchangers through the exhaust line 24 can be delivered to a vaporiser through a second valve 28 whereby the resultant gas can be stored as compressed natural gas, delivered to a distribution network for delivery to consumers or consumed.
  • the embodiment provides a means for the storage of the LNG which need not be associated with a means for the liquefaction of the boil off gas along with the high energy demands of such a facility.
  • the boil off gas is used a feed stock for the production of natural gas hydrate which is able to be stored relatively efficiently.
  • the stored LNG is used as the heat exchange medium in the production of the gas hydrate.
  • the embodiment provides a means of efficiently vaporising LNG at the delivery point for the natural gas whereby the heat generated by the hydration process is used to vaporise the LNG.
  • the embodiment can be used in facilities for the long term storage of LNG, transport facilities and at the point of delivery to customers.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

L'invention concerne un procédé de stockage de gaz naturel consistant à stocker le gaz naturel en tant que gaz naturel liquéfié dans un réservoir de stockage isolé, à maintenir la pression au dessus du gaz naturel liquéfié essentiellement constante par extraction des gaz évaporés du réservoir, à combiner le gaz naturel liquéfié avec de l'eau afin de former un hydrate de gaz naturel, et à stocker l'hydrate de gaz naturel ainsi formé.
PCT/AU2000/001481 1999-12-01 2000-11-30 Stockage de gaz naturel Ceased WO2001040413A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18441/01A AU1844101A (en) 1999-12-01 2000-11-30 Storage of natural gas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ4382A AUPQ438299A0 (en) 1999-12-01 1999-12-01 Storage of natural gas
AUPQ4382 1999-12-01

Publications (1)

Publication Number Publication Date
WO2001040413A1 true WO2001040413A1 (fr) 2001-06-07

Family

ID=3818524

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/001481 Ceased WO2001040413A1 (fr) 1999-12-01 2000-11-30 Stockage de gaz naturel

Country Status (2)

Country Link
AU (1) AUPQ438299A0 (fr)
WO (1) WO2001040413A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04316795A (ja) * 1991-04-16 1992-11-09 Tokyo Gas Co Ltd 天然ガスの貯蔵システム
WO1993001153A1 (fr) * 1990-01-29 1993-01-21 Jon Steinar Gudmundsson Procede de production d'hydrates gazeux pour le transport et le stockage
US6028234A (en) * 1996-12-17 2000-02-22 Mobil Oil Corporation Process for making gas hydrates

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001153A1 (fr) * 1990-01-29 1993-01-21 Jon Steinar Gudmundsson Procede de production d'hydrates gazeux pour le transport et le stockage
JPH04316795A (ja) * 1991-04-16 1992-11-09 Tokyo Gas Co Ltd 天然ガスの貯蔵システム
US6028234A (en) * 1996-12-17 2000-02-22 Mobil Oil Corporation Process for making gas hydrates

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class Q69, AN 1992-420511/51 *

Also Published As

Publication number Publication date
AUPQ438299A0 (en) 1999-12-23

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