WO2014065620A1 - 선박의 액화가스 처리 방법 - Google Patents
선박의 액화가스 처리 방법 Download PDFInfo
- Publication number
- WO2014065620A1 WO2014065620A1 PCT/KR2013/009542 KR2013009542W WO2014065620A1 WO 2014065620 A1 WO2014065620 A1 WO 2014065620A1 KR 2013009542 W KR2013009542 W KR 2013009542W WO 2014065620 A1 WO2014065620 A1 WO 2014065620A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gas
- engine
- storage tank
- lng
- fuel
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000012545 processing Methods 0.000 title claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 162
- 239000000446 fuel Substances 0.000 claims abstract description 127
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 134
- 230000006835 compression Effects 0.000 claims description 29
- 238000007906 compression Methods 0.000 claims description 29
- 229930195733 hydrocarbon Natural products 0.000 claims description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims description 10
- 239000004215 Carbon black (E152) Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 description 375
- 239000003949 liquefied natural gas Substances 0.000 description 198
- 239000007788 liquid Substances 0.000 description 40
- 239000003345 natural gas Substances 0.000 description 38
- 239000002737 fuel gas Substances 0.000 description 27
- 238000002347 injection Methods 0.000 description 25
- 239000007924 injection Substances 0.000 description 25
- 239000003507 refrigerant Substances 0.000 description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 19
- 238000010586 diagram Methods 0.000 description 19
- 230000004048 modification Effects 0.000 description 16
- 238000012986 modification Methods 0.000 description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 239000006200 vaporizer Substances 0.000 description 15
- 238000001704 evaporation Methods 0.000 description 14
- 230000008020 evaporation Effects 0.000 description 14
- 238000009434 installation Methods 0.000 description 13
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- 239000000969 carrier Substances 0.000 description 9
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- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 230000008016 vaporization Effects 0.000 description 9
- 238000003672 processing method Methods 0.000 description 8
- 235000013399 edible fruits Nutrition 0.000 description 6
- 238000009834 vaporization Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910052815 sulfur oxide Inorganic materials 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 239000003915 liquefied petroleum gas Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- -1 for example Substances 0.000 description 2
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- 238000005461 lubrication Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 150000003464 sulfur compounds Chemical class 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
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- 238000005304 joining Methods 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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- F02D19/06—Controlling 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
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- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B63H—MARINE PROPULSION OR STEERING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
- F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
- F25J1/0277—Offshore use, e.g. during shipping
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- 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
- F17C2201/0147—Shape complex
- F17C2201/0157—Polygonal
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- 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)
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- 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
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- 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
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- 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
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- 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
- F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
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- 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
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- 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
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- 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
- F17C2270/0107—Wall panels
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- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- 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
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Definitions
- the present invention relates to a method for treating liquefied gas of a ship.
- Liquefied gas such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas)
- LNG Liquefied Natural Gas
- LPG Liquefied Petroleum Gas
- the liquefied gas is transported in a gas state through a gas pipe on land or sea, or transported to a distant consumer while stored in a liquefied gas carrier in a liquefied state.
- Liquefied gas such as LNG or LPG is obtained by cooling natural gas or petroleum gas to cryogenic temperature (approximately -163 °C in case of LNG), and its volume is greatly reduced than in gas state, so it is very suitable for long distance transportation by sea. .
- Liquefied gas carriers such as LNG carriers
- a storage tank that can withstand cryogenic temperatures of liquefied gas It includes).
- Examples of offshore structures in which storage tanks for storing liquefied gas in such a cryogenic state are provided include vessels such as LNG Regasification Vessel (LV RV), LNG Floating Storage and Regasification Unit (FSRU), LNG Floating, Production, Storage and off-loading), structures such as BMPP (Barge Mounted Power Plant), and the like.
- vessels such as LNG Regasification Vessel (LV RV), LNG Floating Storage and Regasification Unit (FSRU), LNG Floating, Production, Storage and off-loading
- structures such as BMPP (Barge Mounted Power Plant), and the like.
- LNG RV is a LNG regasification facility installed on a LNG carrier that can be self-driving and floating.
- LNG FSRU stores LNG in a storage tank that is unloaded from LNG carriers at sea, away from the land. It is an offshore structure that vaporizes liquefied natural gas and supplies it to onshore demand.
- LNG FPSO purifies the mined natural gas from the sea and directly liquefies and stores it in a storage tank.If necessary, the LNG stored in this storage tank is transferred to an LNG carrier. It is a marine structure used for loading.
- BMPP is a structure used to generate electricity at sea by mounting a power generation facility on a barge.
- the vessel is a concept including all of the structures, such as LNG FPSO, LNG FSRU, BMPP, as well as liquefied gas carrier such as LNG carrier, LNG RV.
- the liquefaction temperature of natural gas is about -163 ° C at ambient pressure, so LNG is evaporated even if its temperature is slightly higher than -163 ° C at normal pressure.
- the LNG storage tank of the LNG carrier is insulated, but since the external heat is continuously transmitted to the LNG, LNG is transported while the LNG carrier is transporting the LNG.
- Boil-off gas (BOG) is generated in the LNG storage tank by continuously vaporizing it in the LNG storage tank.
- the generated boil-off gas increases the pressure in the storage tank and accelerates the flow of the liquefied gas in response to the fluctuation of the vessel, it may cause structural problems, so it is necessary to suppress the generation of the boil-off gas.
- the boil-off gas inside the storage tank is discharged to the outside of the storage tank to maintain the proper pressure of the storage tank to be re-liquefied through the re-liquefaction apparatus.
- the discharged boil-off gas is re-liquefied through heat exchange with a coolant, for example, nitrogen, mixed refrigerant, etc., cooled to a cryogenic temperature in the reliquefaction apparatus including a refrigeration cycle and returned to the storage tank.
- a coolant for example, nitrogen, mixed refrigerant, etc.
- LNG carriers equipped with a conventional DFDE propulsion system because the evaporation gas was processed through the evaporation gas compressor and heating only without installing a reliquefaction facility, were supplied as fuel to the DFDE to consume the evaporated gas.
- the boil-off gas has to be burned in a gas combustion unit (GCU) or vented into the atmosphere.
- GCU gas combustion unit
- the present invention is to solve the conventional problems as described above, liquefied gas treatment of a ship having a storage tank for storing liquefied natural gas, and an engine supplied with liquefied natural gas stored in the storage tank to use as fuel
- liquefied gas treatment of a ship having a storage tank for storing liquefied natural gas, and an engine supplied with liquefied natural gas stored in the storage tank to use as fuel
- the system by using the liquefied natural gas stored in the storage tank and the liquefied natural gas stored in the storage tank as an engine, to provide a liquefied gas treatment system and method of the vessel that can be used efficiently.
- a liquefied gas treatment method comprising: a liquefied gas treatment system comprising: a compressor line for compressing a BOG generated in the storage tank by a compressor to supply the fuel to the main engine and the sub engine as a fuel; A pump line for compressing LNG by a pump and supplying the main engine and the sub-engine as fuel, and a BOG generated in the storage tank in a laden state in which the amount of LNG stored in the storage tank is larger than a ballast state. Is supplied as fuel to at least one of the main engine and the sub engine via the compressor line.
- the liquefied gas in the process vessel is provided as how to.
- LNG stored in the storage tank may be supplied as fuel to the main engine and the sub engine through the pump line.
- BOG generated in the storage tank may be supplied as fuel to any one of the main engine and the sub engine through the compressor line.
- BOG generated in the storage tank may be supplied as fuel to the sub-engine through the compressor line, and LNG stored in the storage tank may be supplied as fuel to the main engine through the pump line.
- BOG generated in the storage tank is supplied as fuel to at least one of the main engine and the sub engine intermittently through the compressor line, and BOG is supplied to at least one of the main engine and the sub engine.
- the LNG stored in the storage tank may be supplied as fuel to at least one of the main engine and the sub engine through the pump line.
- BOG generated in the storage tank and LNG stored in the storage tank can be supplied as fuel to the main engine and the sub engine at the same time.
- the compressor includes a plurality of compression cylinders, and the BOG generated in the storage tank may be supplied as fuel to the secondary engine after being compressed by some compression cylinders among the plurality of compression cylinders.
- the BOG and the forced vaporized LNG generated in the storage tank may be supplied to the compressor, compressed, and then supplied as fuel to at least one of the main engine and the sub engine.
- a BOG not supplied as fuel to the main engine and the sub engine can be liquefied by exchanging heat with the BOG discharged from the storage tank and transferred to the compressor.
- the evaporation consumed by the GCU or the like can be stored. It is possible to reduce the amount of gas, there can be provided a liquefied gas treatment system and method of a ship that can be processed by re-liquefying the evaporated gas without the need to use a separate refrigerant such as nitrogen.
- the liquefied gas treatment system and method of the present invention it is possible to reliquefy the boil-off gas generated in the storage tank without installing a reliquefaction device that consumes a lot of energy and excessively requires an initial installation cost. The energy consumed can be reduced.
- the liquefied gas treatment system and method of the present invention after pressurizing the boil-off gas discharged from the storage tank, some of the compressed boil-off gas is supplied as fuel to the high-pressure natural gas injection engine of the ship, that is, the propulsion system, and compressed The remainder of the boil-off gas is liquefied by the cold heat of the boil-off gas before it is newly discharged and compressed from the storage tank to return to the storage tank.
- a reliquefaction apparatus using a separate refrigerant that is, a nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- a separate refrigerant that is, a nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- the evaporated gas cooled and liquefied in the heat exchanger after being compressed to reduce the pressure by the expander (Expander) it is possible to generate energy during expansion to recycle the energy that is discarded Can be.
- FIG. 1 is a schematic configuration diagram showing a liquefied gas treatment system of a ship according to a first embodiment of the present invention
- FIG. 2 is a schematic configuration diagram showing a liquefied gas treatment system of a ship according to a second preferred embodiment of the present invention
- 3 and 4 are schematic configuration diagrams showing liquefied gas treatment systems of a ship, according to variants of the second preferred embodiment of the present invention.
- FIG. 5 is a schematic configuration diagram showing a liquefied gas treatment system of a ship according to a third embodiment of the present invention.
- FIG. 6 is a schematic configuration diagram showing a liquefied gas treatment system of a ship according to a fourth embodiment of the present invention.
- FIG. 7 and 8 are schematic configuration diagrams showing liquefied gas treatment systems of a ship, according to variants of the fourth preferred embodiment of the present invention.
- FIG. 9 is a schematic structural diagram showing a liquefied gas treatment system of a ship according to a fifth embodiment of the present invention.
- 10 to 12 are schematic configuration diagrams showing liquefied gas treatment systems of a ship according to a modification of the fifth preferred embodiment of the present invention.
- FIG. 13 is a schematic structural diagram showing a liquefied gas treatment system according to a sixth preferred embodiment of the present invention.
- MEGI engines are in the spotlight as next generation eco-friendly engines that can reduce pollutant emissions by 23%, carbon dioxide by 80%, and sulfur compounds by 95% compared to diesel engines of the same class.
- Such a MEGI engine is a vessel such as an LNG carrier for storing and transporting LNG in a cryogenic storage tank (in this specification, a vessel is an LNG carrier, an LNG RV, etc., as well as a marine plant such as LNG FPSO, LNG FSRU, etc.).
- natural gas is used as fuel, and a high pressure gas supply pressure of about 150 to 400 bara (absolute pressure) is required for the engine depending on the load.
- the MEGI engine can be used directly on the propellers for propulsion, for which the MEGI engine consists of a two-stroke engine rotating at low speed. That is, the MEGI engine is a low speed two-stroke high pressure natural gas injection engine.
- a DF engine for example, DFDG; Dual Fuel Diesel Generator
- DFDG Dual Fuel Diesel Generator
- the DF engine can mix and burn oil and natural gas, or use only one selected from oil and natural gas as fuel.There is less sulfur compound in the fuel than if only oil is used as fuel. little.
- the DF engine does not need to supply fuel gas at the same high pressure as the MEGI engine, and compresses the fuel gas to about several to several tens of bara.
- the DF engine drives the generator by the driving force of the engine to obtain electric power, and uses this electric power to drive the propulsion motor or to drive various devices and facilities.
- the methane component having a relatively low liquefaction temperature is evaporated preferentially.
- the methane content is high and can be supplied as a fuel to the DF engine as it is.
- the methane content is relatively lower than the methane value required by the DF engine, and the ratio of hydrocarbon components (methane, ethane, propane, butane, etc.) constituting the LNG varies depending on the region, it is vaporized as it is. Not suitable for fueling DF engines.
- the liquefied natural gas is forcibly vaporized, and then the temperature is lowered to liquefy and remove the heavy hydrocarbon (HHC) component having a higher liquefaction point than methane. After the methane is adjusted, the methane can be further heated to meet the temperature requirements of the engine.
- HHC heavy hydrocarbon
- FIG. 1 is a block diagram showing a liquefied gas treatment system according to a first embodiment of the present invention.
- the liquefied gas treatment system of this embodiment can be applied to, for example, an LNG carrier equipped with a MEGI engine as a propulsion main engine (ie, propulsion means using LNG as fuel).
- the liquefied gas treatment system 100 provides a path for transferring LNG from a cargo tank 1 to a main engine 3 as a propulsion system.
- a fuel supply line 110 and a BOG line 140 providing a path for transferring BOG (Boil Off Gas) generated from the storage tank 1 to the main engine 3.
- BOG Bit Off Gas
- the liquefied gas processing system 100 using the BOG using the BOG according to the present embodiment, the LNG through the fuel supply line 110 as a fuel by the LNG pump (LNG pump 120) and LNG vaporizer (LNG vaporizer) 130 It is supplied to the main engine 3, the BOG is compressed by the BOG compressor 150 through the BOG line 140, and supplied to the main engine 3 as fuel, and the excess BOG from the BOG compressor 150 is supplied.
- the LNG pump LNG pump 120
- LNG vaporizer LNG vaporizer
- MEGI engines that can be used as the main engine 3 need to be fueled at high pressures of about 150 to 400 bara (absolute pressure). Therefore, as the LNG pump 120 and the BOG compressor 150 according to the present embodiment, a high pressure pump and a high pressure compressor capable of compressing LNG and BOG up to the pressure required by the MEGI engine are used.
- the fuel supply line 110 provides a path for transferring LNG supplied by the driving of the transfer pump 2 from the storage tank 1 of the LNGC to the main engine 3 as fuel, for example, and the LNG pump 120 And LNG vaporizer 130 is installed.
- LNG pump 120 is installed to provide the pumping force required for the transfer of LNG to the fuel supply line 110, for example an LNG HP pump (LNG High Pressure pump) can be used, as in the present embodiment is made of a plurality of parallel Can be installed as possible.
- LNG HP pump LNG High Pressure pump
- the LNG vaporizer 130 is installed at the rear end of the LNG pump 120 in the fuel supply line 110 to vaporize the LNG transported by the LNG pump 120.
- LNG is a fruit
- Various heating means for vaporizing by heat exchange with the fruit circulated through the circulation line 131 and providing heat of vaporization of LNG may be used as another example.
- the LNG vaporizer 130 may be used HP vaporizer (High Pressure vaporizer) that can be used at high pressure for the vaporization of LNG.
- the fruit is circulated and supplied to the fruit circulation line 131, for example, steam generated from the boiler may be used.
- the BOG line 140 provides a path for transferring the naturally occurring BOG from the storage tank 1 to the main engine 3, and is connected to the fuel supply line 110 as in the present embodiment, thereby making the BOG the main fuel. It can be supplied to the engine 3, alternatively, it can also provide a path for supplying the BOG directly to the main engine (3).
- the BOG compressor 150 is installed in the BOG line 140 to compress the BOG passing through the BOG line 140. Although only one BOG compressor 150 is shown in FIG. 1, the BOG compressor is configured such that two compressors of the same specification are connected in parallel to satisfy the redundancy requirements as in conventional fuel supply systems. Can be configured. However, when a single BOG compressor 150 is installed in the branch of the excess BOG line 160 in the BOG line 140 as in this embodiment, the economic burden and maintenance according to the installation of the expensive BOG compressor 150 And the additional effect of reducing the burden on repairs.
- the redundant BOG line 160 provides a path for supplying excess BOG from the BOG compressor 150 to the integrated IGG / GCU system 200, as well as the auxiliary IGG / GCU system 200, for example an auxiliary such as a DF engine.
- the excess BOG can be supplied as fuel to the engine or the like.
- the integrated IGG / GCU system 200 is a system in which an Inert Gas Generator (IGG) and a Gas Combustion Unit (GCU) are integrated.
- IGG Inert Gas Generator
- GCU Gas Combustion Unit
- connection line 170 may be provided with a heater 180 for heating BOG or vaporized LNG passing therethrough, and a pressure reduction valve for reducing excessive pressure by adjusting pressure by BOG or vaporized LNG.
- Valve (PRV) 190 may be installed.
- the heater 180 is a gas heater using the heat of combustion of the gas, or other heating means, including a fruit circulation supply for providing a heat source for heating by the circulation of the fruit may be used.
- the BOG When the pressure in the storage tank 1 is equal to or higher than a predetermined pressure or the amount of generation of BOG is large, the BOG is compressed by the BOG compressor 150 and supplied as fuel to the main engine 3. In addition, when the pressure in the storage tank 1 is less than the predetermined pressure or the amount of BOG is generated, the LNG is transported and vaporized by driving the LNG pump 120 and the LNG vaporizer 130 and supplied as fuel to the main engine 3. To be possible.
- the excess BOG from the BOG compressor 150 is supplied to the auxiliary engine such as the integrated IGG / GCU system 200 or the DF engine through the excess BOG line 160 to the consumption or storage tank 1 of the BOG. It is to be used for the purpose of generating inert gas to be supplied, and furthermore, to be used as fuel for auxiliary engines.
- the integrated IGG / GCU system 200 to which BOG is supplied may consume BOG continuously generated from the storage tank 1 by BOG combustion in the main body 210, and may be supplied to the storage tank 1 as needed.
- Combustion gas can also be produced as an inert gas.
- FIG. 2 shows a schematic configuration diagram of a liquefied gas treatment system of a ship according to a second preferred embodiment of the present invention.
- the liquefied gas treatment system of the present invention is applied to an LNG carrier equipped with a high-pressure natural gas injection engine (that is, a propulsion means using LNG as fuel), for example, a MEGI engine, which can use natural gas as a fuel.
- a high-pressure natural gas injection engine that is, a propulsion means using LNG as fuel
- MEGI engine which can use natural gas as a fuel.
- the liquefied gas treatment system of the present invention can be applied to all types of vessels installed with liquefied gas storage tanks, that is, LNG carriers, LNG RV, etc., and marine plants such as LNG FPSO, LNG FSRU, and BMPP.
- the boil-off gas (NBOG) generated and discharged from the storage tank 11 storing the liquefied gas is along the boil-off gas supply line (L1). It is conveyed and compressed in the compressor 13 and then supplied to a high pressure natural gas injection engine, such as a MEGI engine.
- the boil-off gas is compressed by a compressor 13 to a high pressure of about 150 to 400 bara and then supplied as fuel to a high pressure natural gas injection engine, for example, a MEGI engine.
- Storage tanks are equipped with sealed and insulated barriers to store liquefied gases, such as LNG, in cryogenic conditions, but they cannot completely block heat from the outside. Accordingly, the liquefied gas is continuously evaporated in the storage tank 11, and the evaporated gas is discharged through the evaporated gas discharge line L1 to maintain the pressure of the evaporated gas at an appropriate level. Let's do it.
- a discharge pump 12 is installed inside the storage tank 11, to discharge the LNG to the outside of the storage tank if necessary.
- the compressor 13 may include one or more compression cylinders 14 and one or more intermediate coolers 15 for cooling the boil-off gas which has risen in temperature while being compressed.
- the compressor 13 may be configured to compress, for example, the boil-off gas to about 400 bara.
- a compressor 13 of multistage compression is illustrated, comprising five compression cylinders 14 and five intermediate coolers 15, but the number of compression cylinders and intermediate coolers can be changed as necessary.
- it may be changed to have a structure in which a plurality of compressors are connected in series.
- the boil-off gas compressed by the compressor 13 is supplied to the high-pressure natural gas injection engine through the boil-off gas supply line L1, and all of the boil-off gas compressed according to the required amount of fuel required by the high-pressure natural gas injection engine
- the gas injection engine may be supplied, or only a part of the compressed boil-off gas may be supplied to the high pressure natural gas injection engine.
- the boil-off gas discharged from the storage tank 11 and compressed in the compressor 13 (that is, the entire boil-off gas discharged from the storage tank) is called a first stream
- evaporation is performed.
- the first stream of gas may be divided into a second stream and a third stream after compression so that the second stream is supplied as fuel to the high pressure natural gas injection engine and the third stream is liquefied and returned to the storage tank.
- the second stream is supplied to the high pressure natural gas injection engine through the boil-off gas supply line (L1).
- the second stream is passed through all of the plurality of compression cylinders 14 included in the compressor 13 and then connected to the high pressure natural gas injection engine (ie, the boil-off gas supply line L1) and the compressor. After passing through some of the plurality of compression cylinders 14 included in (13), it can be supplied as fuel through a line (ie, boil-off gas branch line L8) connected to the DF engine.
- the third stream is returned to the storage tank 11 through the boil-off gas return line L3.
- a heat exchanger 21 is installed in the boil-off gas return line L3 to cool and liquefy the third stream of compressed boil-off gas.
- the heat exchanger 21 exchanges the third stream of compressed boil-off gas with the first stream of boil-off gas supplied to the compressor 13 after being discharged from the storage tank 11.
- the third stream of compressed boil-off gas can be liquefied by receiving cold heat from the first stream of boil-off gas before compression.
- the heat exchanger 21 heats the cryogenic evaporation gas immediately after being discharged from the storage tank 11 and the high-pressure evaporated gas compressed by the compressor 13 to cool and liquefy the high-pressure evaporated gas.
- the boil-off gas LBOG cooled by the heat exchanger 21 and at least partially liquefied is decompressed while passing through the expansion valve 22 as the decompression means and supplied to the gas-liquid separator 23 in a gas-liquid mixed state. While passing through the expansion valve 22, the LBOG may be depressurized to approximately atmospheric pressure (eg, decompressed from 300 bar to 3 bar).
- the liquefied boil-off gas is separated from the gas and the liquid component in the gas-liquid separator 23, so that the liquid component, that is, LNG, is transferred to the storage tank 11 through the boil-off gas return line L3. It is discharged from the storage tank 11 through the boil-off gas recirculation line (L5) and joined to the boil-off gas supplied to the compressor (13). More specifically, the boil-off gas recirculation line L5 extends from the top of the gas-liquid separator 23 and is connected to the upstream side of the heat-exchanger 21 in the boil-off gas supply line L1.
- the pressure of the boil-off gas after decompression by the decompression means is advantageously set higher than the internal pressure of the storage tank 11.
- the heat exchanger 21 is installed in the boil-off gas return line L3 for convenience of description, but the heat exchanger 21 actually includes a first stream of boil-off gas being transferred through the boil-off gas supply line L1. Since the heat exchange is performed between the third streams of the boil-off gas being transferred through the boil-off gas return line (L3), the heat exchanger 21 is also installed in the boil-off gas supply line (L1).
- Another expansion valve 24 may be further installed in the boil-off gas recirculation line L5 so that the gas component discharged from the gas-liquid separator 23 may be reduced in pressure while passing through the expansion valve 24.
- the third stream of boil-off gas supplied to the gas-liquid separator 23 after being liquefied in the heat exchanger 21 and the gas-component separated from the gas-liquid separator 23 are transferred to the boil-off gas recycle line L5 to exchange heat.
- a cooler 25 is installed in the boil-off gas recirculation line L5 to further cool the three streams. That is, the cooler 25 further cools the boil-off gas in the high pressure liquid state with the natural gas in the low pressure cryogenic gas state.
- the cooler 25 has been described as being installed in the boil-off gas recirculation line L5. However, in the cooler 25, the third stream of the boil-off gas being transferred through the boil-off gas return line L3 and evaporated. Since heat exchange is performed between the gas components being conveyed through the gas recirculation line (L5), the cooler 25 is also installed in the boil-off gas return line (L3).
- the system may be configured such that the cooler 25 is omitted. If the cooler 25 is not installed, the efficiency of the entire system may be slightly lowered. However, piping arrangement and system operation are easy, and the initial installation cost and maintenance cost of the cooler are reduced.
- the compressor 13 is compressed or compressed step by step.
- the boil-off gas on the way is branched through the boil-off gas branch lines L7 and L8 and used in the boil-off gas consumption means.
- a GCU a DF Generator (DFDG), a gas turbine, or the like, which can use natural gas at a lower pressure as a fuel than a MEGI engine, may be used.
- the pressure of the boil-off gas branching through the boil-off gas branch lines L7 and L8 in the middle of the compressor 13 may be about 6 to 10 bara.
- the boil-off gas generated during the transport of cargo (ie LNG) of the LNG carrier is used as the fuel of the engine or re-liquefied Since it can be returned to the storage tank and stored, it is possible to reduce or eliminate the amount of evaporated gas consumed by the GCU, and to re-liquefy the evaporated gas without installing a reliquefaction device using a separate refrigerant such as nitrogen. Can be processed.
- a reliquefaction apparatus that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- a separate refrigerant there is no need to install additional equipment for supplying and storing refrigerant, which reduces the initial installation and operating costs for the entire system.
- FIG. 2 illustrates that the boil-off gas return line L3 for supplying the compressed BOG to the heat exchanger 21 is branched at the rear end of the compressor 13, the boil-off gas return line L3 is the above-mentioned boil-off gas.
- the compressor 13 may be installed to branch off the boil-off gas in the middle of being compressed in stages. 3 shows a variation of branching the two-stage compressed boil-off gas by two cylinders, and FIG. 4 shows a variation of the three-stage compressed boil-off gas.
- the pressure of the boil-off gas branching from the intermediate stage of the compressor 13 may be about 6 to 10 bara.
- the three front cylinders operate in an oil-free manner and the second two cylinders operate in an oil-lubricated manner.
- branching BOG in the rear stage or more than four stages it is necessary to configure the BOG to be transferred through the oil filter, but it may be advantageous in that branching below three stages does not require the use of an oil filter.
- FIG. 5 is a schematic configuration diagram of a liquefied gas treatment system of a ship according to a third preferred embodiment of the present invention.
- the liquefied gas treatment system according to the third embodiment is configured to forcibly vaporize and use LNG when the amount of the boil-off gas required by the MEGI engine or the DF Generator is higher than the amount of the boil-off gas naturally occurring. It is different from the liquefied gas treatment system of the second embodiment. Hereinafter, only the differences from the liquefied gas treatment system of the second embodiment will be described in more detail. In addition, the same components as the second embodiment are given the same reference numerals, and detailed description thereof will be omitted.
- the boil-off gas NBOG generated and discharged from the storage tank 11 storing the liquefied gas is along the boil-off gas supply line L1.
- a high pressure natural gas injection engine such as a MEGI engine
- a DF generator during multistage compression in the compressor 13 and used as fuel.
- the storage tank when the amount of boil-off gas as fuel required by the high pressure natural gas injection engine and the DF engine is larger than the amount of boil-off gas naturally occurring in the storage tank 11, the storage tank The forced vaporization line L11 is provided so that the LNG stored in 11 can be vaporized in the forced vaporizer 31 and supplied to the compressor 13.
- the amount of LNG stored in the storage tank is small so that the amount of generated evaporation gas is small or the amount of evaporated gas as fuel required by various engines is naturally Even if the amount of generated boil-off gas is greater than that, the fuel can be stably supplied.
- FIG. 6 is a schematic structural diagram of a liquefied gas treatment system of a ship according to a fourth preferred embodiment of the present invention.
- the liquefied gas treatment system according to the fourth embodiment is different from the liquefied gas treatment system of the second embodiment in that an expander 52 is used as the decompression means instead of the expansion valve. That is, according to the fourth embodiment, the boil-off gas LBOG cooled in the heat exchanger 21 and at least partially liquefied is decompressed while passing through the expander 52 and the gas-liquid separator 23 in a gas-liquid mixed state. Supplied to.
- the same components as the second embodiment are given the same reference numerals, and detailed description thereof will be omitted.
- the expander 52 produces energy while expanding the liquefied boil-off gas of high pressure to low pressure.
- LBOG may be decompressed to approximately atmospheric pressure as it passes through inflator 52.
- the liquefied boil-off gas is separated from the gas and the liquid component in the gas-liquid separator 23, so that the liquid component, that is, LNG, is transferred to the storage tank 11 through the boil-off gas return line L3. It is discharged from the storage tank 11 through the boil-off gas recirculation line (L5) and joined to the boil-off gas supplied to the compressor (13). More specifically, the boil-off gas recirculation line L5 extends from the top of the gas-liquid separator 23 and is connected to the upstream side of the heat-exchanger 21 in the boil-off gas supply line L1.
- the boil-off gas recirculation line L5 may be further provided with a decompression means, for example, an expansion valve 24, so that the gas component discharged from the gas-liquid separator 23 may be decompressed while passing through the expansion valve 24.
- a decompression means for example, an expansion valve 24, so that the gas component discharged from the gas-liquid separator 23 may be decompressed while passing through the expansion valve 24.
- FIG. 7 and 8 show a schematic configuration diagram showing a liquefied gas treatment system of a ship according to a modification of the fourth preferred embodiment of the present invention.
- the boil-off gas return line L3 for supplying the compressed BOG to the heat exchanger 21 is branched at the rear end of the compressor 13.
- the boil-off gas return line L3 may be installed to branch off the boil-off gas in the middle of being compressed by the compressor 13 step by step.
- FIG. 7 shows a variation of branching the two-stage compressed boil-off gas by two cylinders
- FIG. 8 shows a variation of the three-stage compressed boil-off gas.
- the three front cylinders operate in an oil-free lubrication method and the second two cylinders operate in an oil-lubricated manner.
- branching BOG in the rear stage or more than four stages it is necessary to configure the BOG to be transferred through the oil filter, but it may be advantageous in that branching below three stages does not require the use of an oil filter.
- the liquefied gas treatment system according to the fourth embodiment is further configured to further cool the cooled and liquefied evaporated gas while passing through the heat exchanger 21.
- the cooler 25 (see FIG. 6) as the heat exchanger can be modified to be omitted. If the cooler 25 is not installed, the efficiency of the entire system may be slightly lowered. However, piping arrangement and system operation are easy, and the initial installation cost and maintenance cost of the cooler are reduced.
- the liquefied gas processing system according to the fourth embodiment is modified so that the expander 52 and the expansion valve 55 as the decompression means are arranged in parallel. Can be. At this time, the expander 52 and the expansion valve 55 arranged in parallel are located between the heat exchanger 21 and the gas-liquid separator 23. Evaporation gas return line L3 between the heat exchanger 21 and the gas-liquid separator 23 for installing expansion valves 55 in parallel and, if necessary, using only expander 52 or expansion valve 55. Bypass line L31 is installed which branches from and bypasses inflator 52.
- the liquefied gas processing system and processing method according to the fourth embodiment of the present invention when transporting cargo (ie LNG) of the LNG carrier Since the generated boil-off gas can be used as fuel of an engine or re-liquefied and returned to the storage tank for storage, the amount of boil-off gas consumed by the GCU or the like can be reduced or eliminated. It is possible to re-liquefy and treat the boil-off gas without installing a reliquefaction device using a refrigerant.
- the liquefied gas treatment system and method according to the fourth embodiment of the present invention are applied to a plant such as LNG FPSO, LNG FSRU, or BMPP in addition to a vessel such as an LNG carrier or an LNG RV, it may occur in a storage tank storing LNG. Since the used boil-off gas can be used or reliquefied as a fuel in an engine (including not only an engine for propulsion but also an engine used for power generation, etc.), it is possible to reduce or eliminate wasted boil-off gas.
- a reliquefaction apparatus using a separate refrigerant that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- a separate refrigerant that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- FIG. 9 is a schematic structural diagram of a liquefied gas treatment system of a ship according to a fifth preferred embodiment of the present invention.
- the liquefied gas treatment system according to the fifth embodiment stores the evaporated gas liquefied in the heat exchanger 21 and then pressurized by the depressurization means (for example, the expansion valve 22) without passing through the gas-liquid separator 23, and the storage tank as it is. It differs from the liquefied gas treatment system of the second embodiment in that it is configured to return to (11).
- the depressurization means for example, the expansion valve 22
- the liquefied gas treatment system of the second embodiment is configured to return to (11).
- the same components as the second embodiment are given the same reference numerals, and detailed description thereof will be omitted.
- the vaporized gas ie, two-phase evaporated gas
- gaseous components ie, flash gas
- liquid components ie, liquefied evaporation gas
- the boil-off gas return line L3 may be configured such that the two-phase boil-off gas returned to the storage tank 11 is injected to the bottom of the storage tank 11.
- the gas component (ie, flash gas) in the two-phase boil-off gas injected to the bottom of the storage tank 11 may be partially dissolved in LNG stored in the storage tank 11 or liquefied by cold heat of LNG. .
- the flash gas (BOG) not melted or liquefied is discharged from the storage tank (11) again through the boil-off gas supply line (L1) together with the BOG (NBOG) additionally generated in the storage tank.
- the flash gas discharged from the storage tank 11 together with the newly generated BOG is recycled to the compressor 13 along the boil-off gas supply line L1.
- FIG. 10 is a schematic block diagram showing a liquefied gas treatment system of a ship according to a first modification of the fifth preferred embodiment of the present invention.
- the first modification of the fifth embodiment shown in FIG. 10 is based on the liquefied gas treatment system according to the fifth embodiment shown in FIG. 9 only in that an expander 52 is used instead of the expansion valve as the pressure reducing means. Different. That is, according to the first modification of the fifth embodiment, the boil-off gas LBOG cooled and liquefied in the heat exchanger 21 is decompressed while passing through an expander 52 to be in a gas-liquid mixed state. It returns to the storage tank 11 in an upper state.
- FIG. 11 is a schematic structural diagram showing a liquefied gas treatment system of a ship according to a second modification of the fifth preferred embodiment of the present invention.
- the second modification of the fifth embodiment shown in FIG. 11 is a diagram in that a plurality of compressors (for example, the first compressor 13a and the second compressor 13b) are used instead of the multistage compressor as the compression device. It is different from the liquefied gas treatment system according to the fifth embodiment shown in FIG.
- the boil-off gas (NBOG) generated and discharged from the storage tank 11 storing the liquefied gas is connected to the boil-off gas supply line L1. It is conveyed along and supplied to the 1st compressor 13a.
- the boil-off gas compressed in the first compressor 13a is compressed to about 6 to 10 bara and then supplied to a demanding system (for example, DFDE) using LNG as fuel along the fuel supply line L2. Can be.
- the boil-off gas supplied to and remaining in the DFDE may be further compressed by the second compressor 13b as a booster compressor, and then moving along the boil-off gas return line L3 as in the fifth embodiment described above. Liquefaction can be returned to the storage tank (11).
- the first compressor 13a may be a first stage compressor including one compression cylinder 14a and one intermediate cooler 15a.
- the second compressor 13b may be a first stage compressor including one compression cylinder 14b and one intermediate cooler 15b, and a multistage compressor including a plurality of compression cylinders and a plurality of intermediate coolers may be utilized if necessary. May be
- the boil-off gas compressed in the first compressor 13a is compressed to about 6 to 10 bara and then supplied to the customer, for example, the DF engine (ie, DFDE) through the fuel supply line L2, which is required by the engine.
- the DF engine ie, DFDE
- all of the boil-off gas may be supplied to the engine, or only a portion of the boil-off gas may be supplied to the engine.
- the first stream of boil-off gas is referred to as a first stream.
- Downstream of the compressor (13a) is divided into a second stream and a third stream, the second stream being supplied as fuel to the DF engine (i.e. DFDE) as the propulsion system and the third stream liquefied and returned to the storage tank. can do.
- the second stream is supplied to the DFDE through the fuel supply line (L2), the third stream is further pressurized by the second compressor (13b) and then stored through the boil-off gas return line (L3) through the liquefaction and decompression process
- the tank 11 is returned to.
- a heat exchanger 21 is installed in the boil-off gas return line L3 to liquefy the third stream of compressed boil-off gas. The heat exchanger 21 exchanges the third stream of compressed boil-off gas with the first stream of boil-off gas supplied to the first compressor 13a after being discharged from the storage tank 11.
- the third stream of compressed boil-off gas receives cold heat from the first stream of boil-off gas before being compressed (ie at least partially Liquefied).
- the heat exchanger 21 heats the cryogenic evaporation gas immediately after being discharged from the storage tank 11 and the high-pressure evaporated gas compressed by the compressor 13 to cool (liquefy) the high-pressure evaporated gas. .
- the boil-off gas LBOG cooled in the heat exchanger 21 is depressurized while passing through the expansion valve 22 (for example, JT valve) as a decompression means, and then returns to the storage tank 11 in a gas-liquid mixed state. do. While passing through the expansion valve 22, the LBOG may be depressurized to approximately atmospheric pressure (eg, decompressed from 300 bar to 3 bar).
- the expansion valve 22 for example, JT valve
- the first The boil-off gas compressed by the compressor 13a is branched through the boil-off gas branch line L7 and used in the boil-off gas consumption means.
- the boil-off gas consumption means a GCU, a gas turbine, etc. which can use natural gas as a fuel can be used.
- FIG. 12 is a schematic structural diagram showing a liquefied gas treatment system of a ship according to a third modification of the fifth preferred embodiment of the present invention.
- the third modification of the fifth embodiment shown in FIG. 12 uses the expander 52 instead of the expansion valve as the decompression means, liquefying according to the second modification of the fifth embodiment shown in FIG. It is different from the gas treatment system. That is, according to the third modification of the fifth embodiment, the boil-off gas LBOG cooled and liquefied in the heat exchanger 21 is decompressed while passing through an expander 52 serving as a decompression means to be in a gas-liquid mixed state. Then, it returns to the storage tank 11 in a two phase state.
- the liquefied gas processing system and processing method according to the fifth embodiment of the present invention when transporting cargo (ie LNG) of the LNG carrier Since the generated boil-off gas can be used as fuel of an engine or re-liquefied and returned to the storage tank for storage, the amount of boil-off gas consumed by the GCU or the like can be reduced or eliminated. It is possible to re-liquefy and treat the boil-off gas without installing a reliquefaction device using a refrigerant.
- the liquefied gas treatment system and method according to the fifth embodiment of the present invention is applied to a plant such as LNG FPSO, LNG FSRU, BMPP, in addition to a vessel such as an LNG carrier or LNG RV, it occurs in a storage tank storing LNG. Since the used boil-off gas can be used or reliquefied as a fuel in an engine (including not only an engine for propulsion but also an engine used for power generation, etc.), it is possible to reduce or eliminate wasted boil-off gas.
- a reliquefaction apparatus using a separate refrigerant that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- a separate refrigerant that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- FIG. 13 shows a liquefied gas treatment system according to a sixth embodiment of the present invention.
- the liquefied gas treatment system (ie, the high pressure pump 120) according to the first embodiment of the present invention shown in FIG.
- a hybrid system having a line pressurized and supplied as fuel to the propulsion system, a line pressurized by the compressor 150 to feed the BOG as fuel, and a second embodiment of the present invention shown in FIG.
- the liquefied gas treatment system according to the configuration is integrated.
- each liquefied gas treatment system according to the third to fifth embodiments shown in FIGS. 3 to 12 is a hybrid system (L23, L24, L25 of FIG. 13) as shown in FIG. Of course).
- the liquefied gas treatment system of the ship of the present invention shown in FIG. 13 includes a high pressure natural gas injection engine, for example, a MEGI engine, as a main engine, and a DF engine (DFDG) as a sub engine.
- a high pressure natural gas injection engine for example, a MEGI engine
- DFDG DF engine
- the main engine is used for propulsion for the operation of the ship
- the sub-engine is used for power generation to supply power to various devices and equipment installed inside the ship
- the present invention is used by the use of the main engine and the sub-engine It is not limited.
- a plurality of main engines and sub engines may be installed.
- the liquefied gas treatment system of a ship is a natural gas (that is, a gaseous BOG) stored in the storage tank 11 for engines (ie, a main engine MEGI engine and a sub-engine DF engine). And liquid LNG) as a fuel.
- a natural gas that is, a gaseous BOG
- engines ie, a main engine MEGI engine and a sub-engine DF engine.
- liquid LNG as a fuel.
- the liquefied gas treatment system of the ship is a main BOG supply line as an evaporation gas supply line for supplying BOG housed in the storage tank 11 to the main engine ( L1) and a BOG subsupply line L8 which branches from this BOG main supply line L1 and supplies BOG to the sub engine.
- the BOG main supply line L1 has the same configuration as the boil-off gas supply line L1 in the previous embodiment, but in the description made with reference to FIG. 13, the bog gas supply line for the DF engine (that is, the BOG sub supply line) (L8)) to be referred to as the main BOG supply line (L1).
- the BOG sub-supply line L8 has the same configuration as the boil-off gas branch line L8 in the previous embodiment, but in the description made with reference to FIG. 13, the BOG sub-supply line L8 is distinguished from the BOG main supply line L1 in order to distinguish it from the BOG main supply line L1. It is called subfeed line L8.
- the liquefied gas treatment system of the ship includes an LNG main supply line L23 for supplying LNG contained in the storage tank 11 to the main engine; And an LNG sub supply line L24 which branches from the LNG main supply line L23 and supplies LNG to the sub engine.
- the compressor 13 for compressing the BOG is installed in the BOG main supply line L1
- the high pressure pump 43 for compressing the LNG is installed in the LNG main supply line L23.
- the boil-off gas (NBOG) generated in the storage tank 11 storing the liquefied gas and discharged through the BOG discharge valve 41 is transferred along the main BOG supply line L1 and compressed in the compressor 13, and then pressurized.
- Natural gas injection engines such as MEGI engines.
- the boil-off gas is compressed to a high pressure of about 150 to 400 bara by the compressor 13 and then supplied to the high pressure natural gas injection engine.
- Storage tanks are equipped with sealed and insulated barriers to store liquefied gases, such as LNG, in cryogenic conditions, but they cannot completely block heat from the outside. Accordingly, the liquefied gas is continuously evaporated in the storage tank 11, and the evaporated gas is discharged inside the storage tank 11 to maintain the pressure of the evaporated gas at an appropriate level.
- liquefied gases such as LNG, in cryogenic conditions
- the compressor 13 may include one or more compression cylinders 14 and one or more intermediate coolers 15 for cooling the boil-off gas which has risen in temperature while being compressed.
- the compressor 13 may be configured to compress, for example, the boil-off gas to about 400 bara.
- FIG. 13 illustrates a compressor 13 of multistage compression including five compression cylinders 14 and five intermediate coolers 15, the number of compression cylinders and intermediate coolers can be changed as necessary. Further, in addition to the structure in which a plurality of compression cylinders are arranged in one compressor, it may be changed to have a structure in which a plurality of compressors are connected in series.
- the boil-off gas compressed by the compressor 13 is supplied to the high-pressure natural gas injection engine through the main BOG supply line L1, and all of the compressed boil-off gas is compressed according to the required amount of fuel required by the high-pressure natural gas injection engine.
- the gas injection engine may be supplied, or only a part of the compressed boil-off gas may be supplied to the high pressure natural gas injection engine.
- the sub BOG supply line L8 for supplying fuel gas to the sub engine DF engine is branched from the main BOG supply line L1. More specifically, the secondary BOG supply line L8 is branched from the main BOG supply line L1 so as to branch off the boil-off gas in the middle of being multistage-compressed in the compressor 13.
- FIG. 13 shows a branched two-stage BOG and supplies a portion thereof to the secondary engine through the secondary BOG supply line L8, this is only an example, and branches one or three to five stages of the compressed BOG.
- the system can be configured to be supplied to the secondary engine through the secondary BOG supply line.
- the compressor for example, a compressor manufactured by Burckhardt can be used.
- Buccart's compressor includes a total of five cylinders, the three front cylinders are known to operate in an oil-free lubrication method and the second two cylinders are known to operate in an oil-lubricated manner. Therefore, when using the Buccarter compressor as the compressor 13 for compressing the BOG, it is necessary to configure the BOG to be transferred through the oil filter when branching the BOG in four or more stages. It may be advantageous in that there is no need to use a filter.
- the DF engine which is a sub engine, lowers the BOG pressure and then reconnects to the sub engine when branching off the BOG under high pressure from the rear end of the compressor (13). It can be inefficient because it must be supplied.
- the methane component having a relatively low liquefaction temperature is preferentially vaporized, the methane content in the case of boiled gas can be supplied as a fuel to the DF engine as it is. Therefore, the BOG main supply line and the BOG sub supply line do not need to be installed separately for methane value control.
- the boil-off gas compressed or compressed in the compressor 13 can be branched through the boil-off gas branch line L7 to be used by the BOG consumption means.
- the evaporation gas consumption means a GCU, a gas turbine, or the like, which can use natural gas at a lower pressure than fuel as a MEGI engine, can be used.
- the boil-off gas branch line L7 is preferably branched from the BOG sub-supply line L8, as shown in FIG.
- the process of returning is the same as that already described above with reference to FIG. 2, and thus a detailed description thereof will be omitted.
- the compressor 13 illustrates that the boil-off gas return line L3 for supplying the compressed BOG to the heat exchanger 21 is branched at the rear end of the compressor 13, but the boil-off gas return line L3 is the above-mentioned boil-off gas. Similar to the BOG sub-supply line L8 as the branch line L7 and the boil-off gas branch line, the compressor 13 may be installed to branch off the boil-off gas in the middle of being compressed in stages. 3 shows a variation of branching the two-stage compressed boil-off gas by two cylinders, and FIG. 4 shows a variation of the three-stage compressed boil-off gas. At this time, the pressure of the boil-off gas branching from the intermediate stage of the compressor 13 may be about 6 to 10 bara.
- the three front cylinders operate in an oil-free manner and the second two cylinders operate in an oil-lubricated manner.
- branching BOG in the rear stage or more than four stages it is necessary to configure the BOG to be transferred through the oil filter, but it may be advantageous in that branching below three stages does not require the use of an oil filter.
- a discharge pump 12 installed inside the storage tank 11 for discharging the LNG to the outside of the storage tank 11, and is primarily compressed by the discharge pump 12.
- the high pressure pump 43 for secondaryly compressing the LNG to the pressure required by the MEGI engine is provided.
- Discharge pump 12 may be installed one inside each storage tank (11). Although only one high pressure pump 43 is shown in FIG. 4, a plurality of high pressure pumps may be connected and used in parallel as necessary.
- the pressure of the fuel gas required by the MEGI engine is a high pressure of about 150 to 400 bara (absolute pressure).
- high pressure should be considered to mean the pressure required by the MEGI engine, for example, a pressure of about 150 to 400 bara (absolute pressure).
- the LNG discharged through the discharge pump 12 from the storage tank 11 storing the liquefied gas is transferred along the LNG main supply line L23 and supplied to the high pressure pump 43. Subsequently, the LNG is compressed to high pressure in the high pressure pump 43 and then supplied to the vaporizer 44 to be vaporized. Vaporized LNG is supplied as fuel to a high pressure natural gas injection engine, such as a MEGI engine. Since the pressure required by the MEGI engine is supercritical, LNG compressed at high pressure is neither gas nor liquid. Thus, the expression of vaporizing LNG compressed at high pressure in the vaporizer 44 should be considered to mean that the temperature of the LNG in supercritical state is raised to the temperature required by the MEGI engine.
- the sub LNG supply line L24 for supplying fuel gas to the sub engine DF engine is branched from the main LNG supply line L23. More specifically, the secondary LNG supply line L24 is branched from the primary LNG supply line L23 so as to branch off the LNG before being compressed by the high pressure pump 43.
- the sub LNG supply line L24 branches off the main LNG supply line L23 at an upstream side of the high pressure pump 43, but according to a modification, the sub LNG supply line L24 is connected to the high pressure. It can be modified to branch from the main LNG supply line L23 on the downstream side of the pump 43.
- the LNG supply line L24 branches on the downstream side of the high pressure pump 43, since the pressure of the LNG has risen by the high pressure pump 43, before supplying LNG as fuel to the secondary engine, Therefore, it is necessary to lower the pressure of LNG to the pressure required by the secondary engine.
- the secondary LNG supply line L24 branches off the upstream side of the high pressure pump 43, so that it is not necessary to install additional decompression means.
- the vaporizer 45, the gas-liquid separator 46, and the heater 47 are installed in the secondary LNG supply line L24 to adjust the methane number and temperature of the LNG supplied as fuel to a value required by the DF engine.
- the methane content is relatively lower than that of the boil-off gas, which is lower than the methane value required by the DF engine, and the ratio of hydrocarbon components (methane, ethane, propane, butane, etc.) constituting LNG depending on the region Because of this difference, it is not suitable to be vaporized as it is and supplied to the DF engine as fuel.
- the LNG is heated in the vaporizer 45 and only partially vaporized.
- the fuel gas which is partially vaporized and mixed with a gaseous state (ie, natural gas) and a liquid state (ie, LNG), is supplied to the gas-liquid separator 46 to be separated into gas and liquid. Since the vaporization temperature of the HHC component having a high calorific value is relatively high, the proportion of the heavy hydrocarbon component is relatively high in the liquid LNG which is not vaporized in the partially vaporized fuel gas. Therefore, by separating the liquid component in the gas-liquid separator 46, that is, separating the heavy hydrocarbon component, the methane number of the fuel gas can be increased.
- the heating temperature in the vaporizer 45 can be adjusted to obtain an appropriate methane number.
- the heating temperature in the vaporizer 45 may be determined in the range of approximately -80 to -120 degrees Celsius.
- the liquid component separated from the fuel gas in the gas-liquid separator 46 is returned to the storage tank 11 through the liquid component return line L5.
- the boil-off gas return line L3 and the liquid component return line L25 may be extended to the storage tank 11 after joining.
- the methane-adjusted fuel gas is supplied to the heater 47 through the LNG sub supply line L24, and further heated to a temperature required by the sub engine, and then supplied as fuel to the sub engine.
- the secondary engine is for example DFDG
- the methane number required is generally 80 or more.
- the methane value before the separation of the heavy hydrocarbon component is 71.3
- the lower heating value (LHV) is 48,872.8 kJ / kg (1). atm, saturated vapor basis).
- the methane number is 95.5
- the LHV is 49,265.6 kJ / kg.
- the fuel gas may be supplied to the engine after being compressed through the compressor 13 or may be supplied to the engine after being compressed through the high pressure pump 43.
- ships such as LNG carriers and LNG RVs are used to transport LNG from the place of production to the place of consumption. Therefore, when operating from the place of production to the place of consumption, the ship operates in the state of Laden, which is loaded with LNG in a storage tank, and unloads the LNG. After returning to the production site, the storage tanks are operated in a nearly empty ballast state. In the Leiden state, the amount of LNG is relatively high, so the amount of boil-off gas is relatively high. In the ballast state, the amount of LNG is low, so the amount of LNG is relatively low.
- the amount of boil-off gas generated when the storage tank capacity of LNG is approximately 130,000 to 350,000 is approximately 3 to 4 ton / h at Leiden City. And from about 0.3 to 0.4 ton / h in ballast.
- the amount of fuel gas required by the engines is approximately 1 to 4 ton / h (mean about 1.5 ton / h) for the MEGI engine and approximately 0.5 ton / h for the DF engine (DFDG).
- the BOR Bit Off Rate
- the amount of BOG is also decreasing.
- the compressor line i.e., L1 and L8 in FIG. 13
- the high pressure pump line i.e., L23 and L24 in FIG. 13
- a large amount of evaporation gas is generated. It is preferable to supply fuel gas to the engines through the compressor line in the laden state, and to supply the fuel gas to the engines through the high pressure pump line in a ballast state in which the amount of boil-off gas is generated.
- the energy required to compress BOG by a compressor to a high pressure of 150 to 400 bara (absolute pressure) required by MEGI engines is significantly greater than the energy required to compress liquid (LNG) by a pump. Since energy is required and compressors for compressing gases at high pressures are quite expensive and also bulky, it can be considered economical to use only high pressure pump lines without compressor lines. For example, 2MW of power is consumed to drive a set of multi-stage compressors to fuel a ME-GI engine. With a high-pressure pump, only 100kW of power is consumed.
- the multi-stage compressor does not compress the boil-off gas to the high pressure required by the ME-GI engine and It may be efficient to divert the boil-off gas through secondary BOG feed line L8 during compression and use it as fuel in the DF engine. That is, for example, if the evaporation gas is supplied to the DF engine only through the second stage compression cylinder of the five stage compressor, the remaining three stage compression cylinders are idle.
- the power required is 2MW.However, if only 2 stages are used and the remaining three stages are idling, the power required is 600kW and the high-pressure pump supplies fuel to the ME-GI engine. The power required is 100kW. Therefore, when the amount of BOG generated is less than the fuel required in the ME-GI engine, such as in a ballast state, it is advantageous in terms of energy efficiency that BOG consumes the entire amount in a DF engine or the like and supplies LNG as fuel through a high pressure pump.
- LNG may be forcedly supplied by the compressor while supplying BOG as fuel to the ME-GI engine through the compressor.
- the BOG is collected without being discharged until the storage tank reaches a constant pressure.
- the engine may be supplied as fuel.
- the ship's engine may receive BOG compressed by the compressor 13 and LNG compressed by the high pressure pump 43 as fuel at the same time.
- the ship's engine (DF engine or ME-GI engine) alternately supplies either BOG compressed by the compressor 13 or LNG compressed by the high pressure pump 43 as fuel alternately. You can get it.
- Low-pressure engines that receive low-pressure fuel such as boilers, gas turbines, and low-pressure DF engines usually use evaporated gas generated from storage tanks as fuel, and LNG is forced when the amount of evaporated gas is less than the required fuel.
- a fuel supply system has been developed for use as a fuel by evaporation with a boil-off gas. Such a fuel supply system is limited to a case where only a low pressure engine is installed in a vessel.
- Naturally generated evaporated gas and forced vaporized LNG have different heating values, methane numbers, etc. That is, there is a problem that the output of the engine changes and the operation of the engine is very difficult as the amount of heat continuously changes.
- embodiments of the present invention described above are high pressure engines (e.g. ME-GI engines, approximately 150-400 bara) fueled at high pressures on ships and low pressure engines (e.g. DF) at low pressures.
- high pressure engines e.g. ME-GI engines, approximately 150-400 bara
- low pressure engines e.g. DF
- the evaporated gas when the amount of generated evaporated gas is less than the fuel demand of the entire engine, the evaporated gas is supplied as fuel only to the low pressure engine, or the LNG is supplied as fuel or stored for both the high pressure engine and the low pressure engine.
- the fuel is alternately supplied to the engine as LNG, and thus, a problem that occurs when the evaporated gas and the forced vaporized LNG are mixed and supplied to one engine can be prevented.
- the systems according to the embodiments of the present invention may, if necessary, supply BOG compressed by the compressor 13 and LNG compressed by the high pressure pump 43 to one engine at the same time as fuel. .
- the fuel gas supply system of the present invention in which the compressor line and the high pressure pump line are installed together, can continue normal operation through the other supply line even if a problem occurs in one supply line, and if only one compressor line is installed, With the use of less expensive compressors, the optimum fuel gas supply method can be selected and operated according to the amount of boil-off gas, which can reduce the initial drying cost and the additional cost.
- the boil-off gas generated when the cargo of the LNG carrier ie, LNG
- the LNG carrier ie, LNG
- the boil-off gas generated when the cargo of the LNG carrier (ie, LNG) is transported to the engine. Since it can be used as fuel or re-liquefied and returned to the storage tank for storage, it is possible to reduce or eliminate the amount of boil-off gas consumed by the GCU or the like.
- the evaporated gas can be reliquefied and treated without the need for installation.
- the present embodiment despite the recent trend that the capacity of the storage tank is increased, the amount of generated evaporated gas is increased, and the performance of the engine is improved, and the amount of fuel required is reduced. Since it can be returned to the storage tank, it is possible to prevent the waste of boil-off gas.
- a reliquefaction apparatus using a separate refrigerant that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
- a separate refrigerant that is, nitrogen refrigerant refrigeration cycle, mixed refrigerant refrigeration cycle, etc.
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Abstract
Description
Claims (10)
- LNG를 저장하고 있는 저장탱크와, 상기 저장탱크에 저장되어 있는 LNG를 연료로서 사용하는 주 엔진 및 부 엔진을 갖춘 선박의 액화가스 처리 시스템에 의해 액화가스를 처리하는 방법으로서,상기 액화가스 처리 시스템은, 상기 저장탱크에서 발생된 BOG를 압축기에 의해 압축하여 상기 주 엔진 및 상기 부 엔진에 연료로서 공급하는 압축기 라인과, 상기 저장탱크에 수용된 LNG를 펌프에 의해 압축하여 상기 주 엔진 및 상기 부 엔진에 연료로서 공급하는 펌프 라인을 포함하며,밸러스트 상태에 비해 상기 저장탱크에 저장된 LNG의 양이 많은 레이든 상태에서, 상기 저장탱크에서 발생하는 BOG는 상기 압축기 라인을 통하여 상기 주 엔진 및 상기 부 엔진 중 적어도 하나에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 밸러스트 상태에서, 상기 저장탱크에 저장된 LNG는 상기 펌프 라인을 통하여 상기 주 엔진 및 상기 부 엔진에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 밸러스트 상태에서, 상기 저장탱크에서 발생하는 BOG는 상기 압축기 라인을 통하여 상기 주 엔진 및 상기 부 엔진 중 어느 하나에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 밸러스트 상태에서, 상기 저장탱크에서 발생하는 BOG는 상기 압축기 라인을 통하여 상기 부 엔진에 연료로서 공급되고, 상기 저장탱크에 저장된 LNG는 상기 펌프 라인을 통하여 상기 주 엔진에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 밸러스트 상태에서, 상기 저장탱크에서 발생하는 BOG는 상기 압축기 라인을 통하여 간헐적으로 상기 주 엔진 및 상기 부 엔진 중 적어도 하나에 연료로서 공급되고, 상기 주 엔진 및 상기 부 엔진 중 적어도 하나에 BOG가 공급되지 않을 때, 상기 저장탱크에 저장된 LNG는 상기 펌프 라인을 통하여 상기 주 엔진 및 상기 부 엔진 중 적어도 하나에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 밸러스트 상태에서, 상기 저장탱크에서 발생하는 BOG와 상기 저장탱크에 저장된 LNG는 동시에 상기 주 엔진 및 상기 부 엔진에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 압축기는 복수개의 압축 실린더를 포함하며,상기 저장탱크에서 발생하는 BOG는 복수개의 상기 압축 실린더 중에서 일부의 압축 실린더에 의해 압축된 후 상기 부 엔진에 연료로서 공급되는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 저장탱크에서 발생하는 BOG와 강제기화된 LNG를 상기 압축기에 공급하여 압축시킨 후 상기 주 엔진 및 상기 부 엔진 중 적어도 하나에 연료로서 공급하는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 저장탱크에 저장된 LNG를 상기 부 엔진에 공급할 때, LNG의 메탄가를 상기 부 엔진에서 요구하는 값으로 맞추기 위해 LNG로부터 중탄화수소 성분을 분리하는 것을 특징으로 하는 선박의 액화가스 처리 방법.
- 청구항 1에 있어서,상기 압축기에 의해 압축된 BOG 중에서 상기 주 엔진 및 상기 부 엔진에 연료로서 공급되지 않은 BOG를, 상기 저장탱크로부터 배출되어 상기 압축기로 이송되고 있는 BOG와 열교환시켜 액화시키는 것을 특징으로 하는 선박의 액화가스 처리 방법.
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CN201380055569.1A CN104755737B (zh) | 2012-10-24 | 2013-10-24 | 用于船只的液化气处理方法 |
JP2015535579A JP6002330B2 (ja) | 2012-10-24 | 2013-10-24 | 船舶の液化ガス処理方法 |
EP13849580.9A EP2913512B1 (en) | 2012-10-24 | 2013-10-24 | Method for processing liquefied gas in ship |
NO13849580A NO2913512T3 (ko) | 2012-10-24 | 2013-10-24 | |
ES13849580.9T ES2646601T3 (es) | 2012-10-24 | 2013-10-24 | Método para procesamiento de gas licuado en un barco |
SG11201503115WA SG11201503115WA (en) | 2012-10-24 | 2013-10-24 | Liquefied gas treatment method for vessel |
DK13849580.9T DK2913512T3 (da) | 2012-10-24 | 2013-10-24 | Fremgangsmåde til behandling af flydende gas i et skib |
RU2015119532A RU2608617C2 (ru) | 2012-10-24 | 2013-10-24 | Способ обработки сжиженного газа для судна |
PL13849580T PL2913512T3 (pl) | 2012-10-24 | 2013-10-24 | Sposób przetwarzania skroplonego gazu w statku |
US14/692,639 US20150226379A1 (en) | 2012-10-24 | 2015-04-21 | Liquefied gas treatment method for vessel |
PH12015500895A PH12015500895A1 (en) | 2012-10-24 | 2015-04-22 | Method for processing liquefied gas in ship |
US15/091,465 US20160215929A1 (en) | 2012-10-24 | 2016-04-05 | Liquefied gas treatment method for vessel |
HRP20171645TT HRP20171645T1 (hr) | 2012-10-24 | 2017-10-27 | Postupak obrade ukapljenog plina na brodu |
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- 2013-10-24 DK DK15153500.2T patent/DK2896810T3/en active
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2014
- 2014-07-23 KR KR1020140093372A patent/KR101640770B1/ko active IP Right Grant
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2015
- 2015-04-21 US US14/692,639 patent/US20150226379A1/en not_active Abandoned
- 2015-04-21 US US14/692,637 patent/US9168993B1/en active Active
- 2015-04-22 PH PH12015500896A patent/PH12015500896A1/en unknown
- 2015-04-22 PH PH12015500894A patent/PH12015500894B1/en unknown
- 2015-04-22 PH PH12015500895A patent/PH12015500895A1/en unknown
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2016
- 2016-04-05 US US15/091,465 patent/US20160215929A1/en not_active Abandoned
- 2016-06-08 JP JP2016114893A patent/JP6366642B2/ja active Active
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2017
- 2017-10-27 HR HRP20171645TT patent/HRP20171645T1/hr unknown
- 2017-11-13 HR HRP20171733TT patent/HRP20171733T1/hr unknown
- 2017-11-17 HR HRP20171790TT patent/HRP20171790T1/hr unknown
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2018
- 2018-02-08 HR HRP20180253TT patent/HRP20180253T1/hr unknown
- 2018-03-08 HR HRP20180410TT patent/HRP20180410T1/hr unknown
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