NO331660B1 - Device for liquid production of LNG and method for converting an LNG ship to such device - Google Patents

Device for liquid production of LNG and method for converting an LNG ship to such device Download PDF

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Publication number
NO331660B1
NO331660B1 NO20084875A NO20084875A NO331660B1 NO 331660 B1 NO331660 B1 NO 331660B1 NO 20084875 A NO20084875 A NO 20084875A NO 20084875 A NO20084875 A NO 20084875A NO 331660 B1 NO331660 B1 NO 331660B1
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Norway
Prior art keywords
lng
hull
ship
accordance
production system
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NO20084875A
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Norwegian (no)
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NO20084875L (en
Inventor
Tor Skogan
Lars Sannes
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Moss Maritime As
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Priority to NO20084875A priority Critical patent/NO331660B1/en
Priority to SG2011036092A priority patent/SG171756A1/en
Priority to PCT/NO2009/000376 priority patent/WO2010059059A1/en
Priority to CN200980146302.7A priority patent/CN102216153B/en
Publication of NO20084875L publication Critical patent/NO20084875L/en
Publication of NO331660B1 publication Critical patent/NO331660B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B83/00—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems
    • B63B83/20—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems for conversion to a different use, e.g. for converting tankers into a FPSO-FLNG units
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0128—Shape spherical or elliptical
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0103—Exterior arrangements
    • F17C2205/0119—Vessel walls form part of another structure
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

Abstract

Oppfinnelsen angår en anordning for flytende produksjon av LNG. Anordningen omfatter et LNG-skip omfattende et skipsskrog (12) og minst en sfærisk LNG-lagringstank (13) for lagring av LNG, en fremskytende skrogstruktur (16) festet til skipsskroget (12), et LNG-produksjonssystem (16) for konvertering av naturgass til LNG, hvor LNG-produksjonssystemet er arrangert i den fremskytende skrogstrukturen (16) og midler for overføring av LNG fra LNG- produksjonssystemet til den minst ene sfæriske LNG-lagringstanken (13). Oppfinnelsen angår også en fremgangsmåte for konvertering av et LNG-skip til en anordning for flytende produksjon av LNG.The invention relates to a device for liquid production of LNG. The device comprises an LNG ship comprising a ship hull (12) and at least one spherical LNG storage tank (13) for storing LNG, a projecting hull structure (16) attached to the ship hull (12), an LNG production system (16) for converting natural gas to LNG, where the LNG production system is arranged in the projecting hull structure (16) and means for transferring LNG from the LNG production system to the at least one spherical LNG storage tank (13). The invention also relates to a method for converting an LNG vessel into a device for liquid production of LNG.

Description

TEKNISK OMRÅDE TECHNICAL AREA

Den foreliggende oppfinnelsen angår en anordning for flytende produksjon av LNG og en fremgangsmåte for konvertering av et LNG-skip til en anordning for flytende produksjon av LNG. The present invention relates to a device for liquid production of LNG and a method for converting an LNG ship to a device for liquid production of LNG.

BAKGRUNN BACKGROUND

For transport av naturgass til fjerntliggende markeder kan gassen konverteres til LNG (Liquefied Natural Gas) og skipes over sjø ved hjelp av LNG-skip. Hittil er mer enn 280 LNG-skip blitt bygget i verden. På grunn av den lave temperaturen til lasten (-163°C) er lasteromssystemet på et LNG-skip en komplisert og kostbar installasjon. Over de siste årene har det vært gjort betydelige forsøk på å optimalisere teknologien og redusere kostnaden til LNG-skipslastesystemer av designere og skipsverft. For the transport of natural gas to distant markets, the gas can be converted to LNG (Liquefied Natural Gas) and shipped over sea using LNG ships. To date, more than 280 LNG ships have been built in the world. Due to the low temperature of the cargo (-163°C), the hold system on an LNG ship is a complicated and expensive installation. Over recent years, significant efforts have been made to optimize the technology and reduce the cost of LNG ship loading systems by designers and shipyards.

LNG-skipsmarkedet har vært og er fortsatt fullstendig dominert av to lastesystemdesign; Moss sin sfæriske tank og membrandesignen. The LNG shipping market has been and still is completely dominated by two cargo system designs; Moss's spherical tank and membrane design.

Nylig har det vært foreslått konsepter for å danne flytende LNG-produksjonsenheter, ofte henvist til som en "FLNG-enhet" eller "en FLNG". En slik enhet er tilveiebrakt for offshore produksjon av LNG. Til sammenligning med LNG-skipsdesign vil mengden utstyr som brukes på en FLNG-enhet være betydelig. Siden skipsskroget og LNG-lagringstankene på et LNG-skip er optimalisert for transport av LNG, kan isolasjon av LNG-produksjonsutstyr være vanskelig eller også umulig uten å vesentlig påvirke utformingen av skipsskroget og/eller LNG-lagringstankene. Som svar på denne utfordringen har FLNG-konsepter vært foreslått med LNG-lagringstankutforminger som er ulike fra de dominerende Moss-utformingene og membranutformingene. Konstruksjonen av disse alternative systemene er beheftet med risiko og kostnader sammenlignet med de dominerende LNG-skipsutformingene. Recently, concepts have been proposed to form floating LNG production units, often referred to as an "FLNG unit" or "an FLNG". Such a unit has been provided for offshore production of LNG. In comparison to LNG ship designs, the amount of equipment used on an FLNG unit will be significant. Since the ship's hull and the LNG storage tanks on an LNG ship are optimized for the transport of LNG, insulation of LNG production equipment can be difficult or even impossible without significantly affecting the design of the ship's hull and/or the LNG storage tanks. In response to this challenge, FLNG concepts have been proposed with LNG storage tank designs that are different from the dominant Moss designs and membrane designs. The construction of these alternative systems is fraught with risk and costs compared to the dominant LNG ship designs.

Publikasjonen WO 98/56651 viser et skip med sfæriske lagringstanker for LNG og et produksjonsanlegg for olje/gass. The publication WO 98/56651 shows a ship with spherical storage tanks for LNG and a production plant for oil/gas.

Formålet med den foreliggende oppfinnelsen er å tilveiebringe et system og fremgangsmåter for flytende produksjon av LNG som kan ta direkte fordel av erfaringen med LNG-skip. Videre formål med foreliggende oppfinnelse er å tilveiebringe en fremgangsmåte for konvertering av et LNG-skip til en anordning for flytende produksjon av LNG. The purpose of the present invention is to provide a system and methods for the liquid production of LNG which can take direct advantage of the experience with LNG ships. A further purpose of the present invention is to provide a method for converting an LNG ship into a device for liquid production of LNG.

SAMMENDRAG AV OPPFINNELSEN SUMMARY OF THE INVENTION

Den foreliggende oppfinnelsen angår en anordning for flytende produksjon av LNG, omfattende: et LNG-skip som omfatter et skipsskrog (12) og minst én sfærisk LNG-lagringstank for lagring av LNG samt et LNG-produksjonssystem for konvertering av naturgass til LNG; hvor anordningen videre omfatter: en fremskytende skrogstruktur festet til skipsskroget; hvor LNG-produksjonssystemet er arrangert i den fremskytende skrogstrukturen; midler for overføring av LNG fra LNG-produksjonssystemet til den minst ene sfæriske LNG-lagringstanken. The present invention relates to a device for liquid production of LNG, comprising: an LNG ship comprising a ship hull (12) and at least one spherical LNG storage tank for storing LNG as well as an LNG production system for converting natural gas to LNG; wherein the device further comprises: a projecting hull structure attached to the ship's hull; where the LNG production system is arranged in the forward hull structure; means for transferring LNG from the LNG production system to the at least one spherical LNG storage tank.

I ett aspekt i samsvar med oppfinnelsen er enkelte elementer av LNG-produksjonssystemet arrangert i skipsskroget. In one aspect in accordance with the invention, certain elements of the LNG production system are arranged in the ship's hull.

I ett aspekt i samsvar med oppfinnelsen er skrogstrukturen festet til den ytre sideflaten av skroget til LNG-skipet. In one aspect in accordance with the invention, the hull structure is attached to the outer side surface of the hull of the LNG ship.

I ett aspekt i samsvar med oppfinnelsen er skipsskroget og skrogstrukturen en integrert struktur. In one aspect in accordance with the invention, the ship's hull and the hull structure are an integrated structure.

I ett aspekt i samsvar med oppfinnelsen er skrogstrukturen sveiset til skipsskroget. In one aspect in accordance with the invention, the hull structure is welded to the ship's hull.

I ett aspekt i samsvar med oppfinnelsen er en øvre overflate av skrogstrukturen i det vesentlige på nivå med hoveddekket til LNG-skipet. In one aspect in accordance with the invention, an upper surface of the hull structure is substantially level with the main deck of the LNG ship.

I ett aspekt i samsvar med oppfinnelsen er skrogstrukturen arrangert over vannivået til skipsskroget. In one aspect in accordance with the invention, the hull structure is arranged above the water level of the ship's hull.

I ett aspekt i samsvar med oppfinnelsen omfatter det midler for å motta naturgass fra en ekstern kilde og midler for overføring av naturgassen til LNG-produksjonssystemet. In one aspect in accordance with the invention, it comprises means for receiving natural gas from an external source and means for transferring the natural gas to the LNG production system.

I ett aspekt i samsvar med oppfinnelsen er skrogstrukturen vanntett. In one aspect in accordance with the invention, the hull structure is waterproof.

I ett aspekt i samsvar med oppfinnelsen omfatter skrogstrukturen oppdriftsbeholdere. In one aspect in accordance with the invention, the hull structure comprises buoyancy containers.

I ett aspekt i samsvar med oppfinnelsen er skrogstrukturen og LNG-produksjonssystemet tilveiebrakt for å ettermonteres på LNG-skipet. In one aspect in accordance with the invention, the hull structure and the LNG production system are provided to be retrofitted to the LNG ship.

Den foreliggende oppfinnelsen angår også en fremgangsmåte for konvertering av et LNG-skip til en anordning for flytende produksjon av LNG, hvor LNG-skipet omfatter et skipsskrog, minst én sfærisk LNG-lagringstank for lagring av LNG og et LNG-produksjonssystem; hvor fremgangsmåten omfatter følgende trinn: - tilveiebringelse av skipsskroget hos LNG-skipet med en fremskytende skrogstruktur; - arrangering av LNG-produksjonssystemet i den fremskytende skrogstrukturen; - kobling av LNG-produksjonssystemet til den minst ene sfæriske LNG-lagringstanken. The present invention also relates to a method for converting an LNG ship into a device for floating production of LNG, where the LNG ship comprises a ship hull, at least one spherical LNG storage tank for storing LNG and an LNG production system; where the method comprises the following steps: - provision of the hull of the LNG ship with a projecting hull structure; - arrangement of the LNG production system in the forward hull structure; - connection of the LNG production system to the at least one spherical LNG storage tank.

I ett aspekt i samsvar med oppfinnelsen omfatter fremgangsmåten festing av skrogstrukturen til den ytre sideoverflaten av skipsskroget. In one aspect in accordance with the invention, the method comprises attaching the hull structure to the outer side surface of the ship's hull.

I ett aspekt i samsvar med oppfinnelsen omfatter fremgangsmåten sveising av skrogstrukturen til skipsskroget. In one aspect in accordance with the invention, the method comprises welding the hull structure to the ship's hull.

I ett aspekt i samsvar med oppfinnelsen omfatter fremgangsmåten ettermontering av skrogstrukturen og LNG-produksjonssystemet til skipsskroget. 1 ett aspekt i samsvar med oppfinnelsen omfatter fremgangsmåten tilveiebringelse av skrogstrukturen over vannlinjen til skipsskroget. In one aspect in accordance with the invention, the method comprises retrofitting the hull structure and the LNG production system to the ship's hull. 1 one aspect in accordance with the invention, the method includes providing the hull structure above the waterline of the ship's hull.

DETALJERT BESKRIVELSE DETAILED DESCRIPTION

I det følgende vil det henvises til de vedlagte tegninger som følger: In the following, reference will be made to the attached drawings as follows:

Fig. 1 illustrerer et planriss av et typisk LNG-skip av Moss-typen, med fire sfæriske LNG-tanker. Fig. 1 illustrates a plan view of a typical LNG ship of the Moss type, with four spherical LNG tanks.

Fig. 2 illustrerer et planriss av en FLNG-enhet basert på LNG-skipet i fig. 1. Fig. 2 illustrates a plan view of an FLNG unit based on the LNG ship in fig. 1.

Fig. 3a og 3b illustrerer tverrsnittsdeler av ulike utførelsesformer av FLNG-enheten. Fig. 4 illustrerer en alternativ utførelsesform av fig. 2, som også viser elementer av LNG-produksjonssystemet. Fig. 1 illustrerer det generelle arrangementet hos et typisk LNG-skip 1 av Moss-typen. LNG-skipet anvendes for lagring av LNG. LNG-skipet 1 omfatter i det vesentlige et skipsskrog 2 hvori det er tilveiebrakt sfæriske LNG-lagringstanker 3. LNG-skipet 1 anses å være velkjent for en fagperson på området og vil ikke bli beskrevet her i detalj. I utførelsesformen vist i fig. 1 omfatter LNG-skipet 1 fire sfæriske LNG-lagringstanker 3. Fig. 3a and 3b illustrate cross-sectional parts of various embodiments of the FLNG unit. Fig. 4 illustrates an alternative embodiment of fig. 2, which also shows elements of the LNG production system. Fig. 1 illustrates the general arrangement of a typical LNG ship 1 of the Moss type. The LNG ship is used for storing LNG. The LNG ship 1 essentially comprises a ship hull 2 in which spherical LNG storage tanks 3 are provided. The LNG ship 1 is considered to be well known to a person skilled in the field and will not be described here in detail. In the embodiment shown in fig. 1, the LNG ship 1 comprises four spherical LNG storage tanks 3.

Det henvises nå til fig. 2, som illustrerer den foreliggende oppfinnelsen som en anordning 11 for flytende produksjon av LNG (dvs. en FLNG). Som i fig. 1 omfatter anordningen et LNG-skip omfattende et skipsskrog 12 og minst én sfærisk LNG-lagringstank 13 for lagring av LNG. Reference is now made to fig. 2, which illustrates the present invention as a device 11 for the liquid production of LNG (ie a FLNG). As in fig. 1, the device comprises an LNG ship comprising a ship hull 12 and at least one spherical LNG storage tank 13 for storing LNG.

Anordningen 11 kan utnyttes som en mer eller mindre stasjonær flytende enhet forankret til havbunnen eller posisjonert ved DP (dynamisk posisjonering); hvor naturgass konverteres til LNG på anordningen 11 og hvor tankene 13 anordnes som midlertidig lager. I et slikt tilfelle vil LNG bli fraktet til markedet ved hjelp av et annet transportfartøy som fyller deres LNG-tanker fra tankene 13 hos anordningen 11. Imidlertid kan anordningen 11 også omfatte et fremdriftssystem 14 for transportering av LNG. The device 11 can be used as a more or less stationary floating unit anchored to the seabed or positioned by DP (dynamic positioning); where natural gas is converted to LNG on the device 11 and where the tanks 13 are arranged as temporary storage. In such a case, LNG will be transported to the market by means of another transport vessel that fills its LNG tanks from the tanks 13 of the device 11. However, the device 11 may also include a propulsion system 14 for transporting LNG.

Anordningen eller FLNG'en 11 omfatter videre en fremskytende skrogstruktur 16 festet til skipsskroget 12. Den fremskytende skrogstrukturen 16 omtales her som en såkalt sponsonstruktur, som er et uttrykk som anvendes for å beskrive strukturer som skyter eller stikker frem fra siden av et skip. Sponsonstrukturen 16 kan være festet til den ytre sideoverflaten til skroget av skipsskroget, f.eks. kan sponsonstrukturen 16 være sveiset til skipsskroget 12. Dermed er sponsonstrukturen 16 passende for å bli ettermontert på et eksisterende LNG-skip. The device or the FLNG 11 further comprises a projecting hull structure 16 attached to the ship's hull 12. The projecting hull structure 16 is referred to here as a so-called sponson structure, which is an expression used to describe structures that shoot or protrude from the side of a ship. The sponson structure 16 may be attached to the outer side surface of the hull of the ship's hull, e.g. the sponson structure 16 can be welded to the ship's hull 12. Thus, the sponson structure 16 is suitable for being retrofitted to an existing LNG ship.

Skipsskroget 12 og sponsonstrukturen 16 kan også arrangeres som en integrert struktur, f.eks. dersom hele FLNG-enheten bygges som en ny struktur. The ship's hull 12 and the sponson structure 16 can also be arranged as an integrated structure, e.g. if the entire FLNG unit is built as a new structure.

Som vist i fig. 2 og fig. 3a-b omfatter sponsonstrukturen 16 to strukturer, én sponsonstruktur på hver side (styrbord og babord) av skipsskroget 12. As shown in fig. 2 and fig. 3a-b, the sponson structure 16 comprises two structures, one sponson structure on each side (starboard and port) of the ship's hull 12.

Som vist i fig. 3a og 3b kan det øvre dekket av sponsonstrukturen 16 være på samme nivå som hoveddekket til skipsskroget 16.1 fig. 3a er det vist at sponsonstrukturen 16 er arrangert over vannivået A til skipsskroget 12. Følgelig kan sponsonstrukturen 16 ettermonteres på et LNG-skip uten behov for en tørrdokk under ettermonteringsprosessen. As shown in fig. 3a and 3b, the upper deck of the sponson structure 16 can be at the same level as the main deck of the ship's hull 16.1 fig. 3a, it is shown that the sponson structure 16 is arranged above the water level A of the ship's hull 12. Accordingly, the sponson structure 16 can be retrofitted on an LNG ship without the need for a dry dock during the retrofitting process.

Imidlertid vil det også være mulig å arrangere sponsonstrukturen 16 slik at den er helt eller delvis under vannivået A, som indikert i fig. 3b. Sponsonstrukturen 16 kan være vanntett. Dermed kan sponsonstrukturen 16 bidra til oppdrift og hydrostatisk stabilitet til FLNG'en når den er nedsenket i vann. However, it will also be possible to arrange the sponson structure 16 so that it is completely or partially below the water level A, as indicated in fig. 3b. The sponson structure 16 can be waterproof. Thus, the sponson structure 16 can contribute to buoyancy and hydrostatic stability of the FLNG when it is submerged in water.

Det skal bemerkes at vannivået A i fig. 3a er indikert for et fartøy hvor det ikke er noe LNG i LNG-lagringstankene 13. Når tankene er lagret med LNG vil sponsonstrukturene 16 normalt være delvis nedsenket i vann og dermed bidra til oppdrift og hydrostatisk stabilitet som nevnt ovenfor. It should be noted that the water level A in fig. 3a is indicated for a vessel where there is no LNG in the LNG storage tanks 13. When the tanks are stored with LNG, the sponson structures 16 will normally be partially submerged in water and thus contribute to buoyancy and hydrostatic stability as mentioned above.

Anordningen eller FLNCen 11 omfatter videre et LNG-produksjonssystem 17 for konvertering av naturgass til LNG. LNG-produksjonssystemet 17 er arrangert i den fremskytende skrogstrukturen 16. Imidlertid kan enkelte elementer av LNG-produksjonssystemet 17 være arrangert i skipsskroget 12 dersom dette er passende. Det skal bemerkes at uttrykket "i" er brukt her. Imidlertid vil en fagperson på området vite at ulike elementer av LNG-produksjonssystemet 17 kan være anbrakt på innsiden av skrogstrukturen 16, på innsiden av skipsskroget 12, på dekket eller dekkene til skrogstrukturen 16 eller skipsskroget 12, etc. eller hvor det måtte være passende å tilveiebringe slikt utstyr. The device or FLNC 11 further comprises an LNG production system 17 for converting natural gas to LNG. The LNG production system 17 is arranged in the forward hull structure 16. However, some elements of the LNG production system 17 can be arranged in the ship's hull 12 if this is appropriate. It should be noted that the term "in" is used herein. However, one skilled in the art will know that various elements of the LNG production system 17 may be located on the inside of the hull structure 16, on the inside of the ship's hull 12, on the deck or decks of the hull structure 16 or the ship's hull 12, etc. or wherever appropriate to provide such equipment.

Anordningen eller FLNCen 11 omfatter videre midler (ikke vist) for overføring av LNG fra LNG-produksjonssystemet 17 til den minst ene sfæriske LNG-lagringstanken 13. Videre vil anordningen 11 også omfatte midler for mottak av naturgass fra en ekstern kilde og midler for prosessering og overføring av naturgass til LNG-produksjonssystemet 17. The device or FLNC 11 further includes means (not shown) for transferring LNG from the LNG production system 17 to the at least one spherical LNG storage tank 13. Furthermore, the device 11 will also include means for receiving natural gas from an external source and means for processing and transfer of natural gas to the LNG production system 17.

Siden skrogstrukturen 16 ikke vesentlig påvirker skipsskroget 12, LNG-lagringstankene, etc., er skrogstrukturen 16 og LNG-produksjonssystemet 17 svært passende til å bli ettermontert på LNG-skipet. Since the hull structure 16 does not significantly affect the ship hull 12, the LNG storage tanks, etc., the hull structure 16 and the LNG production system 17 are very suitable to be retrofitted to the LNG ship.

Det henvises nå til fig. 4, hvor ulike elementer av LNG-produksjonssystemet 17 er indikert med følgende henvisningstall: Reference is now made to fig. 4, where various elements of the LNG production system 17 are indicated by the following reference numbers:

- 17a-17b henviser til kompressormoduler - 17a-17b refer to compressor modules

- 17c henviser til en gassforbehandlingsmodul for rensing av gassen fra den eksterne kilden - 17c refers to a gas pretreatment module for cleaning the gas from the external source

- 17d angir et rørstativ - 17d indicates a pipe rack

- 17e angir en kondenseringsmodul for å kondensere gassen til flytende form - 17e indicates a condensing module for condensing the gas into liquid form

- 17f angir en kjølingsmodul for kjølingsformål - 17f indicates a cooling module for cooling purposes

- 17g-h viser henholdsvis ennå en kondenseringsmodul og en kjølemodul. - 17g-h respectively still show a condensing module and a cooling module.

Disse elementene anses kjente for en fagperson på området og vil ikke bli beskrevet ytterligere her. These elements are considered known to a person skilled in the art and will not be described further here.

I skrogstrukturen 16 kan det også være tilveiebrakt tomrom, vannballasttanker, eller én eller flere tanker for lagring av hydrokarbonvæsker, etc, som trekkes ut av LNG-produksjonssystemet. In the hull structure 16 there may also be provided void space, water ballast tanks, or one or more tanks for the storage of hydrocarbon liquids, etc., which are withdrawn from the LNG production system.

Sponsonstrukturene vil nå bli beskrevet i ytterligere detalj. Sponsonstrukturene er stål strukturer med avstivede skallplater og tversgående rammer/skott, utformet slik at de kan sveises direkte til sidene av skipsskroget 12, og har kun mindre påvirkning på utformingen av skipsskroget 12. Sponsonstrukturene kan være utformet og fabrikkert ved bruk av konvensjonelle skipsstrukturelementer som stålplater og valsede/bygde profiler, etc. The sponson structures will now be described in further detail. The sponson structures are steel structures with stiffened shell plates and transverse frames/bulks, designed so that they can be welded directly to the sides of the ship's hull 12, and have only minor influence on the design of the ship's hull 12. The sponson structures can be designed and fabricated using conventional ship structural elements such as steel plates and rolled/built profiles, etc.

Dimensjoneringen av sponsonstrukturene må være tilfredsstillende for å støtte vektene/belastningene fra utstyret som installeres på toppen av sponsonene, utvendig sjøtrykk, innvendig tankvæsketrykk, etc. Sponsonstrukturene vil også representere en vesentlig økning av den totale langsgående styrken til skipsskroget 12. The dimensioning of the sponson structures must be satisfactory to support the weights/loads from the equipment installed on top of the sponsons, external sea pressure, internal tank liquid pressure, etc. The sponson structures will also represent a significant increase in the overall longitudinal strength of the ship's hull 12.

Toppsiden av sponsonstrukturene kan være tilveiebrakt som flate dekk, som tilveiebringer rom og strukturmessig lengde for installasjon av utstyr. Dette er det primære formålet med sponsonene, men like viktig vil sponsonene tilveiebringe ekstra hydrostatisk stabilitet til fartøyet, når sponsonene er tilveiebrakt nedsenket i vann, som er et viktig aspekt gitt den vesentlige vekten og gravitasjonssentrum for utstyret tilknyttet LNG-produksjon. The top side of the sponson structures can be provided as flat decks, providing space and structural length for installation of equipment. This is the primary purpose of the sponsons, but just as importantly, the sponsons will provide extra hydrostatic stability to the vessel, when the sponsons are provided submerged in water, which is an important aspect given the significant weight and center of gravity of the equipment associated with LNG production.

Hoveddimensjonene til sponsonene vil avhenge av flere faktorer, som påkrevd rom for utstyret som skal installeres på toppen av sponsonene, påkrevd hydrostatisk stabilitetsbidrag fra sponsonene, mulige krav for bruk av det innvendige av sponsonene som lager for flytende hydrokarbon og/eller ballastvanntanker, etc. The main dimensions of the sponsons will depend on several factors, such as required space for the equipment to be installed on top of the sponsons, required hydrostatic stability contribution from the sponsons, possible requirements for using the interior of the sponsons as storage for liquid hydrocarbon and/or ballast water tanks, etc.

Det skal bemerkes at oppfinnelsen er like attraktiv for nye bygg som for konverteringer, siden sponsoninstallasjon kun har minimal påvirkning på utformingen av skipsskroget 12 og ingen påvirkning på utformingen av LNG-lagringstankene 3. Dermed representerer oppfinnelsen en mulighet for å utnytte allerede eksisterende LNG-skipene som FLNG-enheter. It should be noted that the invention is just as attractive for new builds as for conversions, since sponson installation has only minimal influence on the design of the ship's hull 12 and no influence on the design of the LNG storage tanks 3. Thus, the invention represents an opportunity to utilize already existing LNG ships as FLNG units.

Sponsonene kan reises og tilpasses skipsskrogstrukturen i en byggedokk på et skipsverft. Imidlertid kan sponsonene også utformes og tilpasses på måter slik at de kan tilpasses når skipsskroget er flytende langs en ekviperingskai (eng: outfitting quay). Sponsonene kan bygges i seksjoner og løftes til sin endelige posisjon ved hjelp av landfaste kraner eller flytende kraner. For forenkling av oppreisingsprosedyren kan utvidelsen av sponsonene så langt som mulig være begrenset innenfor flatsideområdet (eng: flat-of-side area) av hovedskroget. The sponsons can be erected and adapted to the ship's hull structure in a construction dock at a shipyard. However, the sponsons can also be designed and adapted in ways such that they can be adapted when the ship's hull is floating along an outfitting quay. The sponsons can be built in sections and lifted to their final position using land-based cranes or floating cranes. To simplify the recovery procedure, the extension of the sponsons can be limited as far as possible within the flat-of-side area of the main hull.

En fremgangsmåte for konvertering av et LNG-skip til en anordning for flytende produksjon av LNG er også tilveiebrakt. Som nevnt ovenfor omfatter LNG-skipet et skipsskrog 12 og minst én sfærisk LNG-lagringstank 13 for lagring av LNG. Fremgangsmåten omfatter følgende trinn: - tilveiebringelse av skipsskroget 12 for LNG-skipet med en fremskytende skrogstruktur 16; - arrangering av LNG-produksjonssystem 17 i den fremskytende skrogstrukturen 16; - kobling av LNG-produksjonssystemet 17 til den minst ene sfæriske LNG-lagringstanken 13. A method for converting an LNG ship into a device for floating production of LNG is also provided. As mentioned above, the LNG ship comprises a ship hull 12 and at least one spherical LNG storage tank 13 for storing LNG. The method comprises the following steps: - provision of the ship hull 12 for the LNG ship with a projecting hull structure 16; - arrangement of LNG production system 17 in the advancing hull structure 16; - connection of the LNG production system 17 to the at least one spherical LNG storage tank 13.

Fremgangsmåten kan ytterligere omfatte trinnet festing av skrogstrukturen 16 til den ytre sideoverflaten hos skipsskroget 12. The method can further include the step of attaching the hull structure 16 to the outer side surface of the ship's hull 12.

Fremgangsmåten kan videre omfatte trinnet sveising av skrogstrukturen 16 til skipsskroget 12. The method can further include the step of welding the hull structure 16 to the ship's hull 12.

Fremgangsmåten kan ytterligere omfatte trinnet ettermontering av skrogstrukturen 16 og LNG-produksjonssystemet 17 til skipsskroget 12. The method can further include the step of retrofitting the hull structure 16 and the LNG production system 17 to the ship's hull 12.

Fremgangsmåten kan ytterligere omfatte trinnet tilveiebringelse av skrogstrukturen The method may further comprise the step of providing the hull structure

16 over vannlinjen til skipsskroget 12. 16 above the waterline of the ship's hull 12.

Ytterligere modifikasjoner og variasjoner vil være naturlige for en fagperson på området når han leser beskrivelsen ovenfor. Rammen av oppfinnelsen vil fremkomme av de følgende krav og deres ekvivalenter. Further modifications and variations will be apparent to one skilled in the art upon reading the above description. The scope of the invention will emerge from the following claims and their equivalents.

Claims (16)

1. Anordning for flytende produksjon av LNG, omfattende et LNG-skip som omfatter et skipsskrog (12) og minst én sfærisk LNG-lagringstank (13) for lagring av LNG samt et LNG-produksjonssystem (17) for konvertering av naturgass til LNG; karakterisert vedat anordningen videre omfatter: - en fremskytende skrogstruktur (16) festet til skipsskroget (12); hvor LNG-produksjonssystemet (17) er arrangert i den fremskytende skrogstrukturen (16); - midler for overføring av LNG fra LNG-produksjonssystemet (17) til den minst ene sfæriske LNG-lagringstanken (13).1. Device for floating production of LNG, comprising an LNG ship comprising a ship hull (12) and at least one spherical LNG storage tank (13) for storing LNG as well as an LNG production system (17) for converting natural gas to LNG; characterized in that the device further comprises: - a projecting hull structure (16) attached to the ship's hull (12); wherein the LNG production system (17) is arranged in the projecting hull structure (16); - means for transferring LNG from the LNG production system (17) to the at least one spherical LNG storage tank (13). 2. Anordning i samsvar med patentkrav 1, hvor enkelte elementer av LNG-produksjonssystemet (17) er arrangert i skipsskroget (12).2. Device in accordance with patent claim 1, where certain elements of the LNG production system (17) are arranged in the ship's hull (12). 3. Anordning i samsvar med patentkrav 1, hvor skrogstrukturen (16) er festet til den ytre sideoverflaten av skroget til LNG-skipet.3. Device in accordance with patent claim 1, where the hull structure (16) is attached to the outer side surface of the hull of the LNG ship. 4. Anordning i samsvar med patentkrav 1, hvor skipsskroget (12) og skrogstrukturen (16) er en integrert struktur.4. Device in accordance with patent claim 1, where the ship's hull (12) and the hull structure (16) are an integrated structure. 5. Anordning i samsvar med patentkrav 1, hvor skrogstrukturen (16) er sveiset til skipsskroget (12).5. Device in accordance with patent claim 1, where the hull structure (16) is welded to the ship's hull (12). 6. Anordning i samsvar med patentkrav 1, hvor en øvre overflate av skrogstrukturen er i det vesentlige på nivå med hoveddekket til LNG-skipet.6. Device in accordance with patent claim 1, where an upper surface of the hull structure is substantially at the level of the main deck of the LNG ship. 7. Anordning i samsvar med patentkrav 1, hvor skrogstrukturen (16) er arrangert over vannivået til skipsskroget (12).7. Device in accordance with patent claim 1, where the hull structure (16) is arranged above the water level of the ship's hull (12). 8. Anordning i samsvar med patentkrav 1, hvor det omfatter midler for mottak av naturgass fra en ekstern kilde og midler for frakting av naturgassen til LNG-produksjonssystemet (17).8. Device in accordance with patent claim 1, where it includes means for receiving natural gas from an external source and means for transporting the natural gas to the LNG production system (17). 9. Anordning i samsvar med patentkrav 1, hvor skrogstrukturen (16) er vanntett.9. Device in accordance with patent claim 1, where the hull structure (16) is waterproof. 10. Anordning i samsvar med patentkrav 1, hvor skrogstrukturen (16) omfatter oppdriftsrom.10. Device in accordance with patent claim 1, where the hull structure (16) comprises buoyancy space. 11. Anordning i samsvar med patentkrav 1, hvor skrogstrukturen (16) og LNG-produksjonssystemet (17) er tilveiebrakt til å bli ettermontert på LNG-skipet.11. Device in accordance with patent claim 1, where the hull structure (16) and the LNG production system (17) are provided to be retrofitted to the LNG ship. 12. Fremgangsmåte for konvertering av et LNG-skip til en anordning for flytende produksjon av LNG, hvor LNG-skipet omfatter et skipsskrog (12), minst én sfærisk LNG-lagringstank (13) for lagring av LNG og et LNG-produksjonssystem (17); karakterisert vedat fremgangsmåten omfatter følgende trinn: - tilveiebringelse av skipsskroget (12) hos LNG-skipet med en fremskytende skrogstruktur (16); - arrangering av LNG-produksjonssystemet (17) i den fremskytende skrogstrukturen (16); - kobling av LNG-produksjonssystemet (17) til den minst ene sfæriske LNG-lagringstanken (13).12. Method for converting an LNG ship into a device for floating production of LNG, where the LNG ship comprises a ship hull (12), at least one spherical LNG storage tank (13) for storing LNG and an LNG production system (17 ); characterized in that the method comprises the following steps: - provision of the hull (12) of the LNG ship with a projecting hull structure (16); - arrangement of the LNG production system (17) in the advancing hull structure (16); - connection of the LNG production system (17) to the at least one spherical LNG storage tank (13). 13. Fremgangsmåte i samsvar med patentkrav 12, hvor fremgangsmåten omfatter festing av skrogstrukturen (16) til den ytre sideoverflaten av skipsskroget (12).13. Method in accordance with patent claim 12, wherein the method comprises attaching the hull structure (16) to the outer side surface of the ship's hull (12). 14. Fremgangsmåte i samsvar med patentkrav 12, hvor fremgangsmåten omfatter sveising av skrogstrukturen (16) til skipsskroget (12).14. Method in accordance with patent claim 12, where the method comprises welding the hull structure (16) to the ship's hull (12). 15. Fremgangsmåte i samsvar med patentkrav 12, hvor fremgangsmåten omfatter ettermontering av skrogstrukturen (16) og LNG-produksjonssystemet (17) til skipsskroget (12).15. Method in accordance with patent claim 12, wherein the method comprises retrofitting the hull structure (16) and the LNG production system (17) to the ship's hull (12). 16. Fremgangsmåte i samsvar med patentkrav 12, hvor fremgangsmåten omfatter tilveiebringelse av skrogstrukturen (16) over vannlinjen til skipsskroget (12).16. Method in accordance with patent claim 12, wherein the method comprises providing the hull structure (16) above the waterline of the ship's hull (12).
NO20084875A 2008-11-19 2008-11-19 Device for liquid production of LNG and method for converting an LNG ship to such device NO331660B1 (en)

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PCT/NO2009/000376 WO2010059059A1 (en) 2008-11-19 2009-10-28 Device for floating production of lng and method for converting a lng-carrier to such a device
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CN102216153A (en) 2011-10-12
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NO20084875L (en) 2010-05-20
CN102216153B (en) 2014-01-01

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