KR101681725B1 - Power Control Method for FLNG - Google Patents

Power Control Method for FLNG Download PDF

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Publication number
KR101681725B1
KR101681725B1 KR1020150050678A KR20150050678A KR101681725B1 KR 101681725 B1 KR101681725 B1 KR 101681725B1 KR 1020150050678 A KR1020150050678 A KR 1020150050678A KR 20150050678 A KR20150050678 A KR 20150050678A KR 101681725 B1 KR101681725 B1 KR 101681725B1
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KR
South Korea
Prior art keywords
power
production facility
engines
gas
lng
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KR1020150050678A
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Korean (ko)
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KR20160121125A (en
Inventor
정희수
윤상득
Original Assignee
대우조선해양 주식회사
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Priority to KR1020150050678A priority Critical patent/KR101681725B1/en
Publication of KR20160121125A publication Critical patent/KR20160121125A/en
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Publication of KR101681725B1 publication Critical patent/KR101681725B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63JAUXILIARIES ON VESSELS
    • B63J99/00Subject matter not provided for in other groups of this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63JAUXILIARIES ON VESSELS
    • B63J3/00Driving of auxiliaries
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63JAUXILIARIES ON VESSELS
    • B63J3/00Driving of auxiliaries
    • B63J3/02Driving of auxiliaries from propulsion power plant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10Adaptations for driving, or combinations with, electric generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D19/00Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/30Use of alternative fuels, e.g. biofuels

Abstract

A power control system installed in an FLNG including an LNG production facility is disclosed.
The FLNG power control system includes: a production facility power system for producing electric power used in the LNG production facility; And an essential power system for producing essential power supplied to various equipment other than the LNG production facility, wherein the production facility power system and the essential power system share a plurality of engines.

Description

{Power Control Method for FLNG}

The present invention relates to a power control method applied to a FLNG, and more particularly, to a power control method for an FLNG that can increase LNG production and increase utilization of evaporative gas.

Natural gas is transported in the form of gas through land or sea gas pipelines or liquefied in the form of liquefied natural gas (LNG) or liquefied petroleum gas (LPG) and then stored in LNG transport or LPG transport Lt; / RTI >

Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C) and is well suited for long-distance transport through the sea, as its volume is reduced to approximately 1/600 of its gas equivalent.

In recent years, there has been an increasing demand for floating floating structures that drill and store LNG in the deep sea, such as FLNG (floating liquid natural gas plant) and LNG FSRU (floating storage and regasification unit), and these floating structures also have LNG carriers And an LNG storage tank installed in the LNG RV.

FLNG, also known as LNG FPSO (floating production storage and offloading), is a vessel capable of extracting gas from the deep sea and liquefying it to unload LNG to LNG carriers. (Hull) for storing LNG and a topside for producing and treating LNG.

On the other hand, even if the liquefied natural gas storage tank is insulated, there is a limit to completely block the external heat, and the liquefied natural gas is continuously vaporized in the storage tank by the heat transferred to the liquefied natural gas. Liquefied natural gas vaporized in the storage tank is called Boil-Off Gas (BOG).

When the pressure of the storage tank becomes equal to or higher than the set pressure due to the generation of the evaporative gas, the evaporative gas is used as the fuel of the ship or is re-liquefied and returned to the storage tank.

Generally, among the engines used in ships, there are gas-fuel engines such as DF (Dual Fuel) engine and ME-GI engine which can use natural gas as fuel. DF engine is composed of four strokes, Natural gas with a pressure of about 4.5 bar is injected into the combustion air inlet, and the Otto Cycle is used to compress the piston up.

FIG. 1 is a schematic view showing an embodiment of a system for producing electric power used in a conventional LNG production facility.

Referring to FIG. 1, one embodiment of a system for generating electric power used in a conventional LNG production facility is configured so that four gas turbines 10 generate electric power and supply electric power to the consuming place 30. Each of the gas turbines 10 can produce a maximum power of about 25 MW and the conventional LNG production facility requires a peak load of about 70 MW instantaneously and therefore includes four gas turbines 10 LNG production facilities to meet the power required.

2 is a block diagram schematically showing an embodiment of a system for producing a conventional essential electric power.

Referring to FIG. 2, one embodiment of a system that produces conventional mandatory power is configured such that three engines 20 produce power and provide power to the consumer 30. Each engine 20 can usually produce a maximum power of about 6 MW and a system that produces conventional required power instantaneously requires a peak load of about 18 MW to 20 MW so that three or four engines (20) to meet the power required by the system to produce the required power.

According to the conventional power control system for FLNG, the gas turbine 10 can use only gas as the fuel, and the engine 20 can use only the fuel oil as the fuel, It was difficult to use fuel. In addition, the conventional power control system for FLNG is separated from the system for producing electric power used for the LNG production facility and the system for producing the essential electric power, so that it can flexibly cope with the demand for the electric power used for the LNG production facility and the required electric power It was difficult to do. Particularly, even though the efficiency of the engine 20 is higher than that of the gas turbine 10, there is a limitation in using the gas turbine 10 in producing the electric power required by the LNG production facility.

The present invention relates to a system for interconnecting a system for producing electric power used in an LNG production facility and a system for producing essential electric power, producing electric power using a dual fuel gas turbine and a dual fuel engine, And an object thereof is to provide a power control method for an FLNG having priority.

According to an aspect of the present invention, there is provided a power control system installed in an FLNG including an LNG production facility, the power control system comprising: a production facility power system for generating electric power used in the LNG production facility; And an essential power system for producing essential power to be supplied to various equipment other than the LNG production facility, wherein the production facility power system and the essential power system are shared by a plurality of engines, / RTI >

The production facility power system comprises: a plurality of gas turbines; And a plurality of engines shared with the mandatory power system, wherein the production facility power system may preferentially use a plurality of engines shared with the mandatory power system to produce power.

The mandatory power system may include a plurality of engines shared with the production facility power system, and a single use engine.

The engine may be a dual fuel engine that can use both fuel oil and gas as fuel.

The gas turbine may be a dual fuel gas turbine capable of using both fuel oil and gas as fuel.

According to another aspect of the present invention, there is provided a system for supplying power to an LNG production facility by preferentially using a plurality of dual fuel engines, and for supplying power to the LNG production facility with the plurality of dual fuel engines If not, a plurality of dual fuel gas turbines are used to supply power to the LNG production facility, a plurality of dual fuel engines that supply power to the LNG production facility, and power to equipment other than the LNG production facility alone There is provided a power control method for a FLNG in which power is supplied to equipment other than the LNG production facility by a dual fuel engine.

According to another aspect of the present invention, there is provided a gas turbine engine including a plurality of dual fuel engines and a plurality of gas turbine engines, wherein the plurality of dual fuel engines are used preferentially over the plurality of gas turbine engines, Some of the dual fuel engines are provided with FLNGs that power both the LNG production facility and the equipment other than the LNG production facility.

According to the power control system for FLNG of the present invention, since a system for producing electric power used in an LNG production facility and a system for producing essential electric power are operated in conjunction with each other, Demand can be satisfied.

Further, according to the power control system for FLNG of the present invention, since the dual fuel gas turbine and the dual fuel engine are used, the utilization of the evaporative gas in the storage tank can be increased, Therefore, it is possible to increase the frequency of use of the engine instead of the gas turbine, which has a low efficiency, thereby increasing the production of electric power.

1 is a schematic view showing an embodiment of a system for generating electric power used in a conventional LNG production facility.
2 is a block diagram schematically showing an embodiment of a system for producing a conventional essential electric power.
3 is a schematic configuration diagram of a power control system for FLNG according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention.

3 is a schematic configuration diagram of a power control system for FLNG according to a preferred embodiment of the present invention.

Referring to FIG. 3, the power control system for FLNG of the present embodiment includes: a production facility power system 100 for producing electric power used in an LNG production facility; And a mandatory power system 200 that produces the required power.

Generally, the mandatory power is the power required by various equipments except for the power supplied by the production facility power system 100 to the LNG production facility.

The production facility power system 100 of the present embodiment produces and supplies the power required by the LNG production facility to the LNG production facility and includes three dual fuel gas turbines 40, (Dual Fuel Engine, 50). The LNG production facility is installed in the topside module of FLNG to produce LNG by liquefying and refining natural gas drilled by FLNG. The number of the dual fuel gas turbine 40 and the dual fuel engine 50 is not limited and can be changed as required.

Two dual fuel engines 50 included in the production facility power system 100 of the present embodiment are also included in the essential power system 200 of the present embodiment. That is, the production facility power system 100 and essential power system 200 of the present embodiment share two dual fuel engines 50. The number of dual fuel engines 50 shared by the production facility power system 100 and the essential power system 200 of the present embodiment is not limited and can be changed as needed.

The fact that the production facility power system 100 and the essential power system 200 of the present embodiment share two dual fuel engines 50 is different from the prior art in that the production facility power system 100 of this embodiment, The essential power systems 200 are operated in conjunction with each other rather than being independent of each other. Therefore, according to the power control system for FLNG of the present embodiment, power demand can be more flexibly satisfied than when operating both systems independently.

The production facility power system 100 of the present embodiment also includes a dual fuel engine 50 that preferentially uses the dual fuel engine 50 shared with the mandatory power system 200 to produce power and a dual fuel The dual fuel gas turbine 40 is used when production power is insufficient even when all the engines 50 are operated. Thus, the production facility power system 100 of the present embodiment preferentially uses the dual fuel engine 50, which is more efficient than the dual fuel gas turbine 40, so that it can produce more power than the fuel consumption.

The dual fuel gas turbine 40 of this embodiment can produce a maximum power of approximately 25 MW and the dual fuel engine 50 of this embodiment can produce a maximum power of approximately 16 MW. Thus, the production facility power system 100 of the present embodiment includes three dual fuel gas turbines 40 and two dual fuel engines 50 so that a total power of 107 MW (25 MW x 3 + 16 MW x 2) And send it to the consumer 30.

The production facility power system 100 of the present embodiment preferentially uses the two dual fuel engines 50 shared with the essential power system 200 so that up to approximately 32 MW (16 MW x 2) To operate the dual fuel gas turbine 40 when the production facility requires power in excess of 32 MW.

The mandatory power system 200 of the present embodiment includes three dual fuel engines 50 and two of the three dual fuel engines 50 share the production facility power system 100. The number of dual fuel engines 50 included in the essential power system 200 and the number of dual fuel engines 50 shared with the production facility power system 100 are not limited and may be varied as needed.

Since the dual fuel engine 50 of this embodiment can produce a maximum power of approximately 16 MW, the mandatory power system 200 of the present embodiment can produce a maximum power of approximately 48 MW (16 MW x 3) and send it to the consumer 30 have.

The dual fuel gas turbine 40 and the dual fuel engine 50 of this embodiment can use both gas and fuel oil as fuel, unlike conventional gas turbines and engines. Therefore, according to the FLNG power control system of the present embodiment, the fuel can be flexibly selected according to the situation, and utilization of the evaporative gas generated in the storage tank can be enhanced.

In addition, the power control system for FLNG of the present embodiment including three dual fuel gas turbines 40, compared to the conventional power control system for FLNG, which includes four gas turbines 10, There is an advantage that power can be supplied with the same or higher efficiency even with a smaller installation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

10: gas turbine 20: engine
30: Consumer 40: Dual fuel gas turbine
50: Dual fuel engine 100: Production equipment power system
200: Essential power system

Claims (7)

  1. A power control method applied to an FLNG including an LNG production facility,
    The production facility power system produces the power used in the LNG production facility,
    The essential electric power system generates essential electric power to be supplied to various devices other than the LNG production facility,
    The production facility power system and the required power system share a plurality of engines (hereinafter, referred to as 'a plurality of shared engines'),
    The production facility power system comprises: a plurality of gas turbines; And a plurality of shared engines,
    The essential power system comprises: a plurality of shared engines; And an engine used alone,
    The plurality of shared engines are more efficient than the plurality of gas turbines,
    The production facility power system produces electric power by preferentially using the 'plurality of sharing engines', and if it can not meet the electric power demand with the 'plurality of shared engines', it uses the plurality of gas turbines to produce electric power and,
    Wherein the production facility power system and the essential power system are interconnected and operated.
  2. delete
  3. delete
  4. The method according to claim 1,
    Wherein the engine is a dual fuel engine capable of using both fuel oil and gas as fuel.
  5. The method according to claim 1 or 4,
    Wherein the gas turbine is a dual fuel gas turbine capable of using both fuel oil and gas as fuel.
  6. delete
  7. delete
KR1020150050678A 2015-04-10 2015-04-10 Power Control Method for FLNG KR101681725B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150050678A KR101681725B1 (en) 2015-04-10 2015-04-10 Power Control Method for FLNG

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Application Number Priority Date Filing Date Title
KR1020150050678A KR101681725B1 (en) 2015-04-10 2015-04-10 Power Control Method for FLNG

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KR101681725B1 true KR101681725B1 (en) 2016-12-01

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090215328A1 (en) * 2006-10-13 2009-08-27 Rolls-Royce Plc Mixed propulsion system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011032958A1 (en) * 2009-09-17 2011-03-24 Shell Internationale Research Maatschappij B.V. Off-shore structure comprising two power systems and method of powering the same
KR101290290B1 (en) * 2011-11-24 2013-07-26 한국해양대학교 산학협력단 Energy management system and method for ship
KR101384653B1 (en) * 2012-02-07 2014-04-14 삼성중공업 주식회사 Floating structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090215328A1 (en) * 2006-10-13 2009-08-27 Rolls-Royce Plc Mixed propulsion system

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