WO2021167245A1 - Système de re-liquéfaction de gaz d'évaporation de gnl pour navires à gnl de petite et moyenne taille et procédé de re-liquéfaction de gaz d'évaporation de gnl l'utilisant - Google Patents

Système de re-liquéfaction de gaz d'évaporation de gnl pour navires à gnl de petite et moyenne taille et procédé de re-liquéfaction de gaz d'évaporation de gnl l'utilisant Download PDF

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WO2021167245A1
WO2021167245A1 PCT/KR2021/000244 KR2021000244W WO2021167245A1 WO 2021167245 A1 WO2021167245 A1 WO 2021167245A1 KR 2021000244 W KR2021000244 W KR 2021000244W WO 2021167245 A1 WO2021167245 A1 WO 2021167245A1
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boil
gas
lng
lng fuel
bog
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PCT/KR2021/000244
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English (en)
Korean (ko)
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정제헌
최금식
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선보공업주식회사
선보유니텍주식회사
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Publication of WO2021167245A1 publication Critical patent/WO2021167245A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, 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
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/06—Apparatus for de-liquefying, e.g. by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • 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
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a same fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/031—Treating the boil-off by discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/038—Treating the boil-off by recovery with expanding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

Definitions

  • the present invention relates to an LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships and a method for reliquefying LNG boil-off gas using the same.
  • a boil-off gas reliquefaction system By reliquefying multiple times through a heat exchanger, it effectively recycles waste BOG even in small and medium-sized vessels that are not equipped with a separate reliquefaction system, as well as reducing operating and bunkering costs of small and medium-sized vessels.
  • It relates to a boil-off gas reliquefaction system and a method for reliquefying LNG boil-off gas using the same.
  • LNG is emerging as a clean fuel that can reduce harmful substances such as SOx, NOx and carbon dioxide and greenhouse gases compared to conventional fossil fuels, and its application is very wide not only on land but also in the ocean, that is, in shipbuilding and ship fields. is the trend
  • LNG exists as a cryogenic liquid at -162°C under atmospheric pressure, and is supplied to individual consumers after being stored in a cryogenic tank.
  • the pressure of the main pipeline supply chain for natural gas that is connected to the main demand varies from country to country, but is usually operated in the range of 70-120 bar.
  • the LNG stored inside the storage tank is suppressed from heat inflow through the use of insulating materials, but due to the temperature difference between the atmospheric temperature and the inside of the tank, it inevitably causes heat inflow. It is known that 0.15% vol% of stored LNG is evaporated on a daily basis.
  • the evaporated BOG is compressed by the BOG compressor, and the LNG stored in the tank is pressurized to the pressure of the main pipeline supply network through a low-pressure pump and a high-pressure pump, and then is vaporized and sent out.
  • BOG reliquefaction device is a device that cools/liquefies BOG with sub-cooled sensible heat of LNG by directly contacting the first boosted LNG and pressurized BOG with a low pressure pump. Finally, BOG liquefied LNG is transferred to a high-pressure pump.
  • Such BOG reliquefaction apparatus is equipped with large LNG carriers, but in the case of small and medium-sized LNG fuel-powered ships, there is a problem in that proper facilities are not made due to the limitation of the scale.
  • the present invention is intended to solve the above problems, and it is a small and medium-sized LNG fuel that not only effectively recycles BOG thrown away even in small and medium-sized vessels that are not equipped with a separate reliquefaction system, but also reduces the operation and bunkering costs of small and medium-sized vessels.
  • An object of the present invention is to provide an LNG BOG reliquefaction system for a propulsion ship and a method for reliquefying LNG BOG using the same.
  • the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship is connected to an LNG fuel tank, and a boil-off gas compressor for compressing boil-off gas (BOG) in the LNG fuel tank, provided inside the LNG fuel tank
  • An in-tank pump that pressurizes the LNG fuel and supplies it to the engine, connected to the in-tank pump, and pressurizing the LNG fuel supplied through the in-tank pump to the required pressure required by the engine
  • a first heat exchanger for cooling the boil-off gas is provided between the pressurization pump and the boil-off gas compressor, and the evaporation gas is exchanged between the LNG fuel supplied through the pressurization pump and the boil-off gas supplied through the boil-off gas compressor.
  • a second heat exchanger for cooling the gas wherein the boil-off gas compressed through the boil-off gas compressor is first cooled through the second heat exchanger, and then secondary cooling is performed through the first heat exchanger can
  • the present invention provides a method for further cooling the BOG compressed by the BOG compressor by exchanging heat between the BOG supplied to the BOG compressor and the BOG compressed by the BOG compressor. 3 It may be characterized by further comprising a heat exchanger.
  • the present invention may further include a boil-off gas additional compressor for recompressing the boil-off gas compressed through the boil-off gas compressor.
  • the present invention may further include a booster pump provided between the in-tank pump and the first heat exchanger and further pressurizing the LNG fuel pressurized through the in-tank pump.
  • a vaporizer for vaporizing the LNG fuel that has undergone heat exchange through the second heat exchanger may be provided between the second heat exchanger and the engine.
  • the present invention is provided between the first heat exchanger and the LNG fuel tank, the boil-off gas cooled by the first heat exchanger is expanded to convert it into a liquefied LNG fuel, and then to the LNG fuel tank. It may be characterized in that it further comprises a flow control valve for supplying.
  • the present invention is provided between the flow control valve and the LNG fuel tank, and after separating the BOG remaining in the LNG fuel in a liquefied state supplied through the flow control valve, the separated BOG is It may further include a gas-liquid separator for re-supplying to the boil-off gas compressor.
  • the LNG boil-off gas reliquefaction method using the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship uses a boil-off gas compressor connected to the LNG fuel tank to reduce boil-off gas (BOG) in the LNG fuel tank.
  • BOG boil-off gas
  • supplying in the engine direction by using a second heat exchanger provided between the BOG compressor and the pressurization pump to exchange heat between the LNG fuel supplied through the pressurization pump and the BOG supplied through the BOG compressor.
  • Secondary cooling of the boil-off gas by exchanging heat with each other may include supplying the boil-off gas to the LNG fuel tank.
  • FIG. 1 is a diagram showing the configuration of an LNG boil-off gas reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention.
  • FIG. 2 is a view showing a method for reliquefying LNG boil-off gas in a series sequence using the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fueled propulsion ship shown in FIG.
  • FIG. 1 is a diagram showing the configuration of an LNG boil-off gas reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention.
  • the LNG BOG reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship is largely a BOG compressor 110 , an in-tanp pump 120 , a pressurization pump 130 , and a second It may be configured to include a first heat exchanger 140 and a second heat exchanger 150 .
  • the third heat exchanger 160, the boil-off gas additional compressor 170, the booster pump 180, the vaporizer 190, the flow control valve 200 and the gas-liquid separator 210 further comprising may be configured.
  • the boil-off gas compressor 110 is connected to the LNG fuel tank 10 , and serves to increase the temperature by pressurizing and compressing the boil-off gas (BOG) of low pressure generated in the LNG fuel tank 10 .
  • BOG boil-off gas
  • the boil-off gas compressor 110 increases the temperature of the boil-off gas to a temperature of 100 to 150 degrees Celsius by compressing the low-pressure boil-off gas to a pressure corresponding to, for example, 30 barg to 100 barg, preferably 50 barg. .
  • This boil-off gas is then liquefied while being cooled to a temperature of -130 degrees to -155 degrees below zero by heat-exchanging through the first and second heat exchangers 140 and 150 .
  • the in-tank pump 120 serves to pressurize the LNG fuel while being provided inside the LNG fuel tank 10 and supply it to the pressurization pump 130 to be described later. At this time, the pressure value for pressurizing the LNG fuel in the in-tank pump 120 corresponds to the pressure value required by the pressurization pump 130 .
  • the pressurization pump 130 is connected to the in-tank pump 120, and by additionally pressurizing the pressurized LNG fuel supplied through the in-tank pump 120, forms the pressure required by the engine and supplies it to the engine. do.
  • the first heat exchanger 140 is located between the in-tank pump 120 and the pressurization pump 130 , and uses the cooling heat of the pressurized LNG fuel supplied through the in-tank pump 120 to the boil-off gas compressor 110 . ) serves to cool the boil-off gas by exchanging heat with each other.
  • the BOG supplied through the BOG compressor 110 corresponds to BOG that has been primarily cooled through the second heat exchanger 150 to be described later. That is, the first heat exchanger 140 secondaryly cools the BOG that has been primarily cooled through the second heat exchanger 150 to be described later so that the BOG becomes a liquefied LNG fuel.
  • the second heat exchanger 150 is located between the pressurization pump 130 and the boil-off gas compressor 110 , and uses the cooling heat of the pressurized LNG fuel supplied through the pressure pump 130 to the boil-off gas compressor 110 . It serves to primarily cool the boil-off gas by exchanging heat with each other. That is, after the second heat exchanger 150 preferentially cools the BOG, the first heat exchanger 140 further cools the BOG.
  • a third heat exchanger ( 160) is further included.
  • the third heat exchanger 160 is provided to span a line connecting the LNG fuel tank 110 and the BOG compressor 110 and a line connecting the BOG compressor 110 and the second heat exchanger 150 , respectively. do.
  • the BOG supplied to the second heat exchanger 150 through the BOG compressor 110 is cooled by the cooling heat of the BOG passing through the third heat exchanger 160 in the LNG fuel tank 10 .
  • the present invention may include a boil-off gas additional compressor 170 for further compressing the boil-off gas compressed through the boil-off gas compressor 110 .
  • BOG additional compressor 170 is a consumer of compressed BOG and serves to recompress the remaining BOG remaining unused in a DF engine (DFGE) using natural gas as fuel and supply it back to the BOG compressor 110 .
  • DFGE DF engine
  • the reliquefaction efficiency and the reliquefaction amount may be increased by further increasing the pressure of the reliquefied BOG.
  • the BOG additional compressor 170 adjusts the pressure value of the BOG compressed through the BOG compressor 110 to 150 bar. It serves to further compress to 170 bar.
  • a booster pump 180 for further pressurizing the LNG fuel pressurized through the in-tank pump 120 between the in-tank pump 120 and the first heat exchanger 140 may be included.
  • the booster pump 180 further pressurizes the LNG fuel pressurized through the in-tank pump 120 to supply the LNG fuel with a high pressure (eg, 300 barg) to the first heat exchanger 140 .
  • the present invention includes a vaporizer 190 for vaporizing the LNG fuel that has undergone heat exchange between the second heat exchanger 150 and the engine of the ship through the second heat exchanger 150 .
  • the vaporizer 190 serves to create the temperature required by the engine by vaporizing the LNG fuel pressurized by the pressure pump 130 and heat exchanged.
  • hot water or steam may be applied as a thermal medium.
  • the present invention converts the LNG fuel in a liquefied state by expanding the boil-off gas cooled by the first heat exchanger 140 between the first heat exchanger 140 and the LNG fuel tank 100 and then the LNG It is configured to include a flow control valve 200 to be supplied to the fuel tank (10).
  • the flow control valve 200 corresponds to a Joule-Thomson valve, and by rapidly expanding the boil-off gas cooled by the first heat exchanger 140 , the LNG fuel in the liquefied state is reduced through the pressure drop of the compressed gas. As possible, it is supplied to the LNG fuel tank 10 . It may be reliquefied at a temperature of approximately minus 160 degrees Celsius by the flow control valve 200 .
  • the present invention separates the boil-off gas remaining in the LNG fuel in the liquefied state supplied through the flow control valve 200 between the flow control valve 200 and the LNG fuel tank 10 and then separates It may be configured to include a gas-liquid separator 210 for re-supplying the boil-off gas to the boil-off gas compressor 110 .
  • the gas-liquid separator 210 separates the line for supplying the reliquefied LNG fuel into the LNG fuel tank 10 by the flow control valve 200 and the BOG remaining in the reliquefied LNG fuel, and then the separated evaporation It is divided into a line for supplying gas to the boil-off gas supply line connecting the LNG fuel tank 10 and the boil-off gas compressor 110 again.
  • the boil-off gas separated by the gas-liquid separator 210 is again supplied to the boil-off gas compressor 110 after being merged with the LNG fuel supplied from the LNG fuel tank 10 .
  • the BOG discharged from the LNG fuel tank 10 is compressed using the BOG compressor 110 connected to the LNG fuel tank 10 (S201).
  • the LNG fuel supplied through the pressure pump 130 and the BOG compressor 110 are supplied.
  • the BOG is primarily cooled (S203).
  • the LNG fuel supplied through the in-tank pump 120 and the second heat exchanger 150 are mixed.
  • BOG is secondarily cooled and supplied to the LNG fuel tank 10 (S204).
  • the present invention BOG thrown away can be effectively recycled even in small and medium-sized ships that are not equipped with a separate reliquefaction system.
  • the present invention is a technology that can be widely used in the LNG industry to realize its practical and economical value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

La présente invention concerne un système de re-liquéfaction de gaz d'évaporation (BOG) de GNL pour navires de petite et de moyenne taille et un procédé de re-liquéfaction de BOG de GNL l'utilisant, le système effectuant la re-liquéfaction du BOG, qui est généré à partir d'un combustible de GNL apparaissant comme combustible propre, une pluralité de fois à travers une pluralité d'échangeurs de chaleur, ce qui permet à un gaz d'évaporation, qui doit être éliminé, d'être efficacement recyclé, même sur des navires de petite et de moyenne taille qui ne sont pas équipés d'un système de re-liquéfaction supplémentaire. L'invention permet de réduire les coûts d'exploitation et les frais de soute de navires de petite et de moyenne taille.
PCT/KR2021/000244 2020-02-20 2021-01-08 Système de re-liquéfaction de gaz d'évaporation de gnl pour navires à gnl de petite et moyenne taille et procédé de re-liquéfaction de gaz d'évaporation de gnl l'utilisant WO2021167245A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2020-0020804 2020-02-20
KR1020200020804A KR102418019B1 (ko) 2020-02-20 2020-02-20 중소형 lng 연료 추진선용 lng 증발가스 재액화 시스템 및 이를 이용한 lng 증발가스 재액화 방법

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WO2021167245A1 true WO2021167245A1 (fr) 2021-08-26

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JP (1) JP3231535U (fr)
KR (1) KR102418019B1 (fr)
CN (1) CN214701458U (fr)
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Publication number Priority date Publication date Assignee Title
CN114017988A (zh) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 一种基于混合工质制冷技术的lng船用bog再液化循环系统
CN114017989A (zh) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 Lng-bog再液化系统及其适用的混合冷剂

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0959657A (ja) * 1995-08-25 1997-03-04 Kobe Steel Ltd 低温液体及びそのボイルオフガスの処理方法及び装置
US20090211262A1 (en) * 2007-02-12 2009-08-27 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Lng tank ship having lng circulating device
KR20180076940A (ko) * 2016-12-28 2018-07-06 대우조선해양 주식회사 선박의 연료 공급 시스템
KR20190081519A (ko) * 2017-12-29 2019-07-09 대우조선해양 주식회사 선박용 증발가스 재액화 시스템 및 방법
KR20190098319A (ko) * 2018-02-14 2019-08-22 주식회사 동화엔텍 선박용 증발가스 재액화 시스템

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180093405A (ko) 2017-02-13 2018-08-22 대우조선해양 주식회사 증발가스 재액화 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0959657A (ja) * 1995-08-25 1997-03-04 Kobe Steel Ltd 低温液体及びそのボイルオフガスの処理方法及び装置
US20090211262A1 (en) * 2007-02-12 2009-08-27 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Lng tank ship having lng circulating device
KR20180076940A (ko) * 2016-12-28 2018-07-06 대우조선해양 주식회사 선박의 연료 공급 시스템
KR20190081519A (ko) * 2017-12-29 2019-07-09 대우조선해양 주식회사 선박용 증발가스 재액화 시스템 및 방법
KR20190098319A (ko) * 2018-02-14 2019-08-22 주식회사 동화엔텍 선박용 증발가스 재액화 시스템

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KR20210106596A (ko) 2021-08-31
CN214701458U (zh) 2021-11-12
KR102418019B1 (ko) 2022-07-07

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