WO2021239724A1 - Centrale électrique indépendante flottante et procédé de conversion d'un support gnl en cette dernière - Google Patents

Centrale électrique indépendante flottante et procédé de conversion d'un support gnl en cette dernière Download PDF

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Publication number
WO2021239724A1
WO2021239724A1 PCT/EP2021/063883 EP2021063883W WO2021239724A1 WO 2021239724 A1 WO2021239724 A1 WO 2021239724A1 EP 2021063883 W EP2021063883 W EP 2021063883W WO 2021239724 A1 WO2021239724 A1 WO 2021239724A1
Authority
WO
WIPO (PCT)
Prior art keywords
power generator
sponson
power plant
modules
lng
Prior art date
Application number
PCT/EP2021/063883
Other languages
English (en)
Inventor
Theo BOSMAN
Hoemin CHUNG
Ted BRINKEL
Jaap-Harm WESTHUIS
Original Assignee
Single Buoy Moorings Inc.
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 Single Buoy Moorings Inc. filed Critical Single Buoy Moorings Inc.
Priority to EP21730806.3A priority Critical patent/EP4157708A1/fr
Publication of WO2021239724A1 publication Critical patent/WO2021239724A1/fr

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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
    • 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 
    • 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
    • B63B2035/4433—Floating structures carrying electric power plants
    • B63B2035/444—Floating structures carrying electric power plants for converting combustion energy into electric energy

Definitions

  • the present invention relates to a floating independent power plant (FIPP) comprising a converted LNG carrier with a hull and a plurality of LNG storage tanks.
  • the invention further relates to converting an LNG carrier into a floating independent power plant and to a power generator module for conversion of an LNG carrier into a floating independent power plant.
  • FIPP floating independent power plant
  • a method of converting a LNG carrier into a floating LNG plant is known from WO 2012/072292.
  • the LNG carrier comprises as least a hull and a plurality of LNG storage tanks and the floating LNG plant comprises at least one sponson on the side of the hull, for creating additional hull volume, process equipment for LNG processing on the floating LNG plant, and a reservoir for storing fluids separated during the LNG processing, wherein said reservoir is formed by the ballast tank or in the space reserved for the ballast tank of the original LNG carrier.
  • the present invention seeks to provide a floating LNG plant for supplying power.
  • the present invention further seeks to provide a floating LNG plant which can be manufactured by converting an LNG carrier with reduced production in critical time. Further, the present invention seeks to provide a floating solution which allows to keep the initial full containment system of an LNG carrier.
  • the present invention provides a floating independent power plant (FIPP) comprising a converted LNG carrier with a hull and a plurality of LNG storage tanks arranged within the hull, wherein the floating independent power plant comprises: a regasification unit, connected with an inlet to the plurality of LNG storage tanks, for regasification of stored LNG; a sponson on either side of the hull, each sponson being subdivided into a plurality of substantially equally sized compartments along the length of the sponson; a plurality of power generator modules comprising power generator sets, each forming one of the plurality of compartments and provided with an inlet connected to an outlet of the regasification unit for receiving fuel gas and adapted for generating electricity using the received fuel gas, wherein each of the compartments comprising a power generator set is provided with an exhaust stack and an air inlet in an upper side, with the exhaust stack and air inlet being located on longitudinally opposite sides of the compartment and with the exhaust stacks
  • FIPP floating independent power plant
  • the FIPP may be moored at any location where power needs be supplied.
  • the lay-out of the FIPP allows the compartments of the sponsons holding the power generator sets being manufactured as modular units, which can be nearly finished prior to integration into the sponson. As a result, manufacturing logistics and efficiency are Improved.
  • the adjoining modular units By placing the adjoining modular units in mirror position around adjoining walls, the exhaust stacks of adjoining compartments are combined, saving deck space.
  • LNG carrier or "original LNG carrier” is used. This means a vessel that has originally been constructed for transporting LNG.
  • sponson refers to any projecting hull structure in order to provide additional hull volume.
  • the sponson normally extends along the length of a vessel.
  • the top side of the sponson can be made flat, thereby providing additional deck space.
  • the top side could be adapted to be flush with the vessel’s main deck.
  • the top side of a sponson does not need to be flat and does not need to be flush with the vessel’s main deck. It is very well possible to connect a sponson to the hull below the main deck.
  • the sponson Is divided in a lower part and an upper part.
  • the lower part serves as a base onto which the power generator modules are placed to form the upper part and is integrated to the original LNG carrier in a dry-dock.
  • This allows the generator modules being integrated with the vessel afloat, reducing the amount of time the vessel needs to be in the dry-dock.
  • the power generator modules forming the upper part of the sponson may be assembled and pre-commissioned prior to integration on the lower sponson parts.
  • many construction phases of the FFIP may be carried out in parallel, reducing critical time of construction phases carried out on the vessel.
  • the FIPP comprises at least ten power generator modules and each sponson is subdivided into at least five compartments.
  • Each power generator module may produce 18MW power, allowing the FIPP to produce at least 180MW in total.
  • the floating independent power plant comprises a steam turbine generator and/or one or more diesel generators for supporting sailing such that the floating independent power plant is self- propelled during deployment.
  • Having a propulsion unit on-board advantageously allows the vessel being repositioned and deployed to different locations without need of additional support vessels for towing.
  • the cooling equipment comprises a closed fresh water circulation loop for each power generator set and a heat exchanger installed above each of the sponsons and/or on the main deck in direct contact with the outside environment, with each of the closed fresh water circulation loops running between one of the power generation sets and the heat exchanger, the heat exchanger being an air flow heat exchanger.
  • the air flow heat exchanger comprises aplurality of air cooled cells. This creates a large heat exchange area. [0014] In an embodiment, the air flow heat exchanger further comprises at least one fan for providing forced airflow as local cooling medium, providing enhanced heat transfer.
  • each power generator set is provided with at least one dedicated air cooled cell, such that each power generator set has dedicated cooling.
  • This set-up avoids the need of a very large collector and a general pumping system for distributing cooling water evenly over each of the power generation modules when in use.
  • the use of dedicated systems allows individual operation of each of the power generation modules according to match the electricity needs, i.e. when a relatively low amount of electricity is required from the FIPP some power generation modules may be switched off. Each unit operates as a separate entity.
  • the cooling equipment comprises a closed fresh water circulation loop for each power generator set and a heat exchanger installed in the hull or one of the sponsons, with each of the closed fresh water loops running between one of the power generator sets and the heat exchanger for exchanging heat therewith and wherein the heat exchanger is connected with an inlet to at least one cold seawater storage tank for receiving seawater as cooling medium in the heat exchanger and with an outlet extending through the hull to overboard heated seawater to open sea, wherein the cold seawater storage tank is located in one or more compartments of the sponsons not holding a power generator set and the cold seawater storage tank is provided with a connection to a seawater lift system.
  • the sea water lift system is already commonly available vessels for cooling on-board. This system does not require additional deck space, unlike the air cooling.
  • each of the closed fresh water circulation loops comprises a pump for pumping the fresh water through the closed fresh water circulation loop, which pump is driven by the power generator set. This allows each unit being operated as a separate entity.
  • the regasification unit is provided with a closed fresh water circulation loop which runs between the regasification unit and the heat exchanger, for cooling the regasification unit.
  • the floating independent power plant comprises an export gantry for connecting to an onshore grid for supply of the generated electricity thereto.
  • the invention provides a method of converting a Moss type LNG carrier to a floating independent power plant, comprising the steps of removing existing bilge keels from either side of the hull; providing a plurality of power generator modules each comprising a power generator set, an air inlet and an outlet, wherein the air inlet and the outlet are located on opposite sides of the module; assembling the plurality of power generator modules in an upper part of two sponsons, such that each of the two sponsons is subdivided into a plurality of substantially equally sized compartments along a longitudinal direction, and such that adjoining power generating modules are mirrored around their adjoining wall, and combining the outlets of adjoining power generator modules in a funnel of exhaust pipes; attaching the two sponsons to either side of the hull, integrating a lower part of each sponson at the location of the bilge keel; providing a regasification unit for creating fuel gas from LNG, connecting said regasification unit with
  • the method further comprises providing each of the power generator modules with at least one air cooled cell on an upper side forming a deck of the sponson and a closed fresh water circulation loop running between the power generator set and said at least one air cooled cell.
  • this step is carried out for each sponson after the assembly of the plurality of power generator modules therein.
  • the air cooling system may be included in each modules prior to integration into the sponsons.
  • the method further comprises providing at least one fan on an upper side of each of the power generator modules for creating a forced airflow that is directed over the at least one air cooled cell.
  • the in invention provides a sponson for converting a Moss type LNG carrier to a floating independent power plant according to the method of claim 11, the sponson being subdivided into a plurality of substantially equally sized compartments along a longitudinal direction of the sponson and arranged to receive a plurality of power generator modules, each holding one power generator module, arranged such that adjoining power generating modules are mirrored around their adjoining wall, the sponson comprising at least one funnel of exhaust pipes for combining the outlets of adjoining power generator modules and said sponson being adapted for being fixedly mounted on a side of the hull of the Moss type LNG carrier.
  • FIG. 1 shows a high-level schematic of the power generating system of a floating independent power plant
  • FIG. 2A shows a schematic top view of an embodiment of a floating independent power plant according to the invention
  • Fig. 2B shows a schematic cross-section of the floating independent power plant of Fig. 2A;
  • FIG. 2C shows a schematic of the cooling system of the floating independent power plant of Figs. 2A and B;
  • FIG. 3A shows a schematic top view of an embodiment of a floating independent power plant according to the invention
  • Fig. 3B shows a schematic cross-section of the floating independent power plant of Fig. 3 A; and [0031] Fig. 3C shows a schematic of the cooling system of the floating independent power plant of Figs. 3A and B.
  • Fig. 1 shows a high-level schematic of the power generating system of a floating independent power plant (FIPP).
  • the FIPP is shown to comprise manifolds 31, LNG tanks 30, a regasification unit 40, a boiler 41, a propulsion unit 42, a power generation module 50 with a power generator set 51 and a cooling system 52, and an export gantry 59.
  • the manifolds 31 serve as an inlet to the LNG tanks 30 and are adapted for loading LNG via marine loading hoses from LNG carriers which more alongside the FIPP.
  • the regasification unit 40 is with an inlet connected to an outlet of the LNG tanks 30 and is adapted to regasify LNG to provide gas as fuel gas via a first outlet to the plurality of power generation sets 51 and via a second outlet to the boiler 41.
  • the boiler 41 is with a first outlet connected to the propulsion unit 42 and with a second outlet connected to the plurality of power generation sets 51.
  • the power generation sets 51 are each connected with an electric output to the export gantry 59 for exporting generated electricity to a power grid.
  • Each of the power generation sets 51 is individually connected to a cooling system 52. Two embodiments of FIPP cooling systems are described in more detail with reference to Figs. 2C and 3C.
  • the regasification unit comprises at least one centrifugal type fuel gas compressor (not shown) to compress boil-off gas from the LNG tanks 30 to a required fuel gas pressure for the gas engines.
  • the at least one fuel gas compressor discharges pressurised gas to at least one fuel gas after-cooler/heater (not shown), which regulates the final temperature of the fuel gas prior to feeding the gas engines.
  • the regasification unit further comprises at least one steam heated fuel gas vaporiser (not shown), adapted to produce from the LNG additional fuel gas which is required on top of the boil-off gas and suitable for direct supply to the gas engines. Pressurised LNG is introduced from the LNG tanks 30 and the boil-off gas is combined with the fuel gas downstream of the after-cooler/heater.
  • Each power generator set 51 comprises at least one gas engine and an electric power generator (both not shown), wherein the gas engine(s) will deliver mechanical power to the electric power generator(s) for the production of electricity.
  • the gas at fuel gas power is lead from the regasification unit to at least one of the plurality of power generation modules 50 into the power generator set 51 thereof.
  • the generated electricity from the at least one power generator set 51 is generated at 15 kV and raised up to 132 kV export voltage, metered and subsequently supplied to the on shore grid through the export gantry 59.
  • the export voltage can be set to specific project needs.
  • the boiler 41 is running in order to supply steam for local power generation and LNG vaporisation.
  • a boil-off gas system which is already present in the original LNG carrier is used for supplying gas to the boiler 41.
  • the FIPP is self-propelled with a high pressure steam system as propulsion unit.
  • the boiler 41 bums marine gas oil and/or gas depending on the LNG storage on board. All power generator units are shut-down during sailing.
  • the required electricity for supporting the FIPP sailing is generated by a steam turbo generator and/or diesel generator, which is already present in the original LNG carrier from which the FIPP is converted and which is part of the aforementioned propulsion unit 42.
  • a steam turbo generator is used, a secondary function of the boiler comprises continuous LNG gas burning, so that no diesel oil consumption is required.
  • Figs. 2A and 2B respectively show a schematic top view and cross-sectional view of an embodiment of a FIPP, with a detailed schematic of the cooling system thereof shown in Fig. 2C.
  • the FIPP is a vessel, with four Moss type LNG tanks 30, having a sponson 10, 20 on both sides of the hull 1.
  • the sponsons 10, 20 extend over the full length of a cargo section of the hull 1 and are constructed to house the power generation modules 50 with the gas engine driven power generator sets 51 and their supporting systems.
  • the sponsons 10, 20 are both subdivided into six equal length sections forming twelve compartments in total. In each of the compartments of one of the sponsons 20 a single power generator set 51 is installed.
  • the compartments with the power generator sets 51 can be manufactured and pre-commissioned separately as power generation modules 50 and installed into the sponsons in a near-complete state.
  • Four of the compartments of the other of the sponsons are each formed by a single power generation module 50, while the two compartments in the middle of the ship under the LNG transfer station have a seawater cooling system 60 installed.
  • Air inlets 54 and outlets are created in the upper side of each of the power generation module 50 compartments. These inlets 54 and outlets are located as far apart as possible on opposite sides of each compartment to maximise air flow there through. The outlets of two neighbouring compartments are combined into a single exhaust funnel 55 to minimise the number of structures on the upper deck of the sponsons 10, 20.
  • the structures of the sponsons 10, 20 have the same frame distances as the original LNG carrier’s hull 1 in order to guarantee continuation of the original LNG carrier’s hull structure inside the sponsons for optimal load transfer in the structure.
  • the lower part of each of the sponsons 10, 20 is integrated at the location of the former bilge keel at mid-ship.
  • the height of the sponsons 10, 20 is continuous between the fore and aft ends, such that the upper sides of both sponsons 10, 20 is aligned with the upper deck of the hull 1.
  • the shape of the hull 1 towards the ends thereof dictates a widening of the sponsons 10, 20 to maintain a proper connection between said sponsons 10, 20 and the hull 1.
  • the sponsons 10, 20 are slightly tapered on both ends thereof to reduce the drag during sailing.
  • a pipe rack 58 is created on the upper deck to transport fuel gas, cooling water and cabling across the vessel.
  • the pipe rack 58 is installed on the longitudinal sides of the deck of the original LNG carrier.
  • the cooling system 52’ in this embodiment is based on a seawater cooling system 60.
  • the cooling system 52’ comprises a dedicated fresh water circulation loop 68 for each of the power generation modules 50 and the regasification unit 40, comprising at least one pump 5 lc for circulating the fresh water therein, and the seawater cooling system 60 located in the sponson 10, which comprises a sea chest 61, seawater lift pumps 62 and heat exchanger tanks 65.
  • Each of the fresh water circulation loops 68 runs between the power generation module 50 or regasification unit 40, where the fresh water absorbs heat from the engines and auxiliaries, to the heat exchanger tanks, where the fresh water releases heat to the seawater therein, prior to being cycled back to the power generation module 50 or regasification unit 40.
  • the sea chest 61 is located in the bottom of the sponson 10, below sea-level, and adapted to take in and store cold seawater.
  • the seawater lift pumps 62 take ‘cold’ seawater as cooling medium from the sea chest 61 and pump it via inlets 63 into the heat exchanger tanks 65, where the cold seawater exchanges heat with the fresh water from the fresh water circulation loops 68 running there through. Heated seawater is expelled overboard the vessel via outlet channels 64, positioned at an upper side of the heat exchanger tanks 65.
  • Figs. 3 A and 3B respectively show a schematic top view and cross-sectional view of an alternative embodiment of a FIPP, with a detailed schematic of the cooling system thereof shown in Fig. 3C.
  • the embodiment of Fig. 3A-3C is similar to the one shown in Fig. 2A-2C, except that in the embodiment of Fig. 3A-3C both sponsons 10’, 20’ are subdivided into five equal length sections forming compartments, which have a single power generator set 51 installed therein.
  • cooling system 52 is an air cooling system, as shown in Fig. 3C.
  • the air cooling system 52 comprises a dedicated fresh water circulation loop 68’ for each of the power generation modules 50’, comprising a pump 51c for circulation of the fresh water therein, and a heat exchanger 69' in the form of air cooler cells 65’ provided with fans 67 creating a forced ambient air flow.
  • the fresh water in the fresh water circulation loop 68’ is heated up by the gas engine and auxiliary equipment in the power generation module 50’ and pumped to the air cooling cells, which are located outside the compartment on or above deck level, to exchange heat with the ambient air flow prior to being cycled back to the power generation module 50’.
  • the air cooling cells are for example arranged at deck level, which may extend over the sponsons, or alternatively on a higher level, for example mounted on a rack above deck level.
  • Each power generation module 50’ is connected via the dedicated fresh water circulation loop 68’ to a dedicated heat exchanger 69', which is installed above the sponson 10’, 20’.
  • the dedicated heat exchanger 69' may take almost full width of the sponson, in some embodiments.
  • each heat exchanger has five air cooler cells 65’.
  • the fresh water is preferably lead over or through the air cooler cells in a thin flow layer, for example through the use of a finned tube bundle, in order to create a large heat exchange area and enhance heat transfer.
  • the fans 67 provide additional (forced) airflow over the surface of the air cooler cells 65’, further enhancing heat transfer and thus improving the cooling capacity of the cooling system.
  • the air cooling system 52 is shown to replace the seawater cooling system of Fig. 2, but alternatively it may be desirable to use the cooling system of Fig. 3C in addition to the seawater based cooling system of Fig. 2C.
  • the present invention has been described above with reference to a number of exemplary embodiments as shown in the drawings. Modifications and alternative implementations of some parts or elements are possible, and are included in the scope of protection as defined in the appended claims.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

FFIP comprenant un support de GNL converti présentant une pluralité de réservoirs de stockage de GNL à l'intérieur de la coque, comprenant : une unité de regazéification, reliée par une entrée à la pluralité de réservoirs de stockage de GNL, permettant la regazéification de GNL ; une nageoire de part et d'autre de la coque, chacune subdivisée en une pluralité de compartiments de taille égale le long de la nageoire ; une pluralité de modules de générateur d'énergie comprenant des ensembles de générateurs d'énergie, chacun formant l'un des compartiments et présentant une entrée reliée à une sortie de l'unité de regazéification, conçus pour générer de l'électricité à l'aide du gaz combustible, chacun des compartiments comprenant un ensemble générateur d'énergie étant pourvu d'une pipe d'échappement et d'une entrée d'air situées sur des côtés longitudinalement opposés du compartiment et les pipes d'échappement de compartiments adjacents étant combinés ; et un équipement de refroidissement, accouplé à la pluralité de modules de génération d'énergie et agencé pour refroidir lesdits modules.
PCT/EP2021/063883 2020-05-25 2021-05-25 Centrale électrique indépendante flottante et procédé de conversion d'un support gnl en cette dernière WO2021239724A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21730806.3A EP4157708A1 (fr) 2020-05-25 2021-05-25 Centrale électrique indépendante flottante et procédé de conversion d'un support gnl en cette dernière

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20176328 2020-05-25
EP20176328.1 2020-05-25

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WO2021239724A1 true WO2021239724A1 (fr) 2021-12-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023102595A1 (fr) * 2021-12-07 2023-06-15 Charlie Six Pty Ltd Navire à gaz liquéfié

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010059059A1 (fr) * 2008-11-19 2010-05-27 Moss Maritime As Dispositif pour la production flottante de gaz naturel liquéfié et procédé destiné à convertir un méthanier en un tel dispositif
WO2012072292A1 (fr) 2010-11-30 2012-06-07 Single Buoy Moorings Inc. Usine de gnl flottante
WO2018144024A1 (fr) * 2017-02-05 2018-08-09 Pcore Energy Llc Regazéification de gaz naturel liquéfié et système d'optimisation de chaleur de production d'énergie
WO2019145560A1 (fr) * 2018-01-29 2019-08-01 Single Buoy Moorings Inc. Centrale électrique en mer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010059059A1 (fr) * 2008-11-19 2010-05-27 Moss Maritime As Dispositif pour la production flottante de gaz naturel liquéfié et procédé destiné à convertir un méthanier en un tel dispositif
WO2012072292A1 (fr) 2010-11-30 2012-06-07 Single Buoy Moorings Inc. Usine de gnl flottante
WO2018144024A1 (fr) * 2017-02-05 2018-08-09 Pcore Energy Llc Regazéification de gaz naturel liquéfié et système d'optimisation de chaleur de production d'énergie
WO2019145560A1 (fr) * 2018-01-29 2019-08-01 Single Buoy Moorings Inc. Centrale électrique en mer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023102595A1 (fr) * 2021-12-07 2023-06-15 Charlie Six Pty Ltd Navire à gaz liquéfié

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