WO2015170889A1 - Fuel supply system and fuel supply method of leg carrier - Google Patents

Fuel supply system and fuel supply method of leg carrier Download PDF

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Publication number
WO2015170889A1
WO2015170889A1 PCT/KR2015/004545 KR2015004545W WO2015170889A1 WO 2015170889 A1 WO2015170889 A1 WO 2015170889A1 KR 2015004545 W KR2015004545 W KR 2015004545W WO 2015170889 A1 WO2015170889 A1 WO 2015170889A1
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Prior art keywords
bog
reliquefaction
fuel supply
leg
compressor
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PCT/KR2015/004545
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French (fr)
Korean (ko)
Inventor
정제헌
백창현
김병열
장재호
유병용
강동억
Original Assignee
대우조선해양 주식회사
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Publication of WO2015170889A1 publication Critical patent/WO2015170889A1/en

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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
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • 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
    • 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
    • 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
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • 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
    • 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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
    • 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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/0087—Propane; Propylene
    • 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
    • F25J1/0203—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 using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0208—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 using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle in combination with an internal quasi-closed refrigeration loop, e.g. with deep flash recycle loop
    • 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
    • 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
    • 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
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/62—Ethane or ethylene
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/08—Cold compressor, i.e. suction of the gas at cryogenic temperature and generally without afterstage-cooler
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • 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

Definitions

  • the present invention relates to a fuel supply system and a fuel supply method that can be applied to a ME-GI engine used as a propulsion engine of a LEG 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. .
  • the liquefied gas carrier ship is for discharging the liquefied gas to the land requirements by loading the liquefied gas into the sea and for this purpose, includes a storage tank capable of withstanding the cryogenic temperature of the liquefied gas.
  • 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, Structures such as storage and off-loading).
  • vessels such as LNG Regasification Vessel (LV RV), LNG Floating Storage and Regasification Unit (FSRU), LNG Floating, Production, Structures such as storage and off-loading).
  • LNG RV is a LNG regasification facility installed on a liquefied gas carrier that can be self-driving and floating.
  • LNG FSRU stores liquefied natural gas, which is unloaded from LNG carriers, in a storage tank after liquefaction as needed.
  • It is an offshore structure that vaporizes natural gas and supplies it to land demand.
  • LNG FPSO is a marine structure that is used to directly purify mined natural gas from the sea and liquefy directly to store it in a storage tank, and to transfer LNG stored in the storage tank to an LNG carrier if necessary.
  • the offshore structure is a concept including not only vessels such as liquefied gas carriers and LNG RVs but also structures such as LNG FPSO and LNG FSRU.
  • 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 in order to maintain an appropriate pressure in the storage tank to be re-liquefied through the re-liquefaction device.
  • the evaporated gas is compressed to a low pressure of approximately 4 to 8 bara and fed to the reliquefaction apparatus before it is done.
  • the compressed boil-off gas is liquefied through heat exchange with nitrogen cooled to cryogenic temperatures in a reliquefaction apparatus including a nitrogen refrigeration cycle and then returned to the storage tank.
  • the boil-off gas In order to increase the efficiency of reliquefaction of the boil-off gas, it is preferable to compress the boil-off gas to a high pressure.
  • the LNG stored in the storage tank is kept at a normal pressure, if the pressure of the re-liquefied liquefied liquefied gas is too high, When flash gas (flash gas) is generated. Therefore, although the re-liquefaction efficiency is low, there is a problem in that the boil-off gas can be compressed at a low pressure of about 4 to 8 bara.
  • the low-pressure BOG is a nitrogen gas refrigerant.
  • Korean Patent Publication No. 10-2006-0123675 describes compression to about 6.8 bara
  • Korean Patent Publication No. 10-2001-0089142 corresponding US Patent US 6,530,241 In the detailed description of compression to 4.5 bara is described).
  • the liquefied boil-off gas that is, LBOG
  • flash gas was generated when it returned to the storage tank, thereby compressing the pressure of the boil-off gas to a low pressure in the boil-off gas compressor.
  • the evaporated gas generated from the storage tank is re-liquefied through the reliquefaction apparatus and then returned to the storage tank.
  • the flash gas is generated as much as possible.
  • the basic concept was to not raise the pressure of the re-liquefied boil-off gas to suppress it.
  • Examples of reliquefaction apparatuses for reliquefaction of boil-off gas include International Patent Publications WO 2007/117148, WO 2009/136793, and WO 2011/078689, Korean Patent Publication No. 2006-0123675, and Korean Patent Publication No. 2001-0089142 Nitrogen refrigeration cycles disclosed in Japanese Patent Application Laid-Open and the like, mixed refrigerant cycles and the like have been used.
  • a conventional boil-off gas reliquefaction apparatus when re-liquefying the boil-off gas, it is generally pressurized at about 4 to 8 bara to reliquefy, and in the art, it is technically reasonable to pressurize more than that. There was widespread perception that they could not.
  • the nitrogen refrigeration cycle has a problem of low liquefaction efficiency using nitrogen gas (N 2 ) as the refrigerant
  • the mixed refrigerant cycle has a problem of low stability because it uses a refrigerant in which nitrogen and hydrocarbon gas are mixed as the refrigerant.
  • a turbo expander-type nitrogen reverse Brayton cycle was implemented to reliquefy the boil-off gas, and a mixed refrigerant in a land LNG liquefaction plant.
  • a Joule-Thompson refrigeration cycle was implemented to liquefy natural gas. Nitrogen reverse Brayton cycles used for marine use are advantageous in ships or offshore structures where space is limited due to their relatively simple configuration, but have low efficiency.
  • the mixed refrigerant Joule-Thomson refrigeration cycles used for land use are relatively Although the efficiency is high, due to the characteristics of the mixed refrigerant, there is a problem in that the device configuration is complicated, such as the use of a separator to separate when a gas-liquid state exists at the same time. However, this reliquefaction method is still widely used.
  • the LEG stored in the storage tank of the LEG vessel may be pressurized using a low pressure pump and a high pressure pump, and then heated in a heater to be supplied as fuel of the ME-GI engine for propulsion of the LEG vessel.
  • a low pressure pump and a high pressure pump may be pressurized using a low pressure pump and a high pressure pump, and then heated in a heater to be supplied as fuel of the ME-GI engine for propulsion of the LEG vessel.
  • the LEG stored in the storage tank of the LEG ship is -90 °C
  • the cryogenic equipment must be used as equipment such as low pressure pump, high pressure pump, heater, etc., the technology development for fuel supply system not using cryogenic equipment This is required.
  • the present invention uses a reliquefaction system installed in the LEG ship, the fuel supply to supply the fuel of the ME-GI engine to the BOG generated in the LEG storage tank to satisfy the conditions required as the fuel of the ME-GI engine It's about the system.
  • the present invention also uses a reliquefaction system provided on the LEG vessel, and supplies the BOG generated in the LEG storage tank to the fuel of the ME-GI engine so as to satisfy the conditions required as the fuel of the ME-GI engine. It relates to a fuel supply method.
  • the present invention also uses a reliquefaction system provided on the LEG vessel, and supplies the BOG generated in the LEG storage tank to the fuel of the ME-GI engine so as to satisfy the conditions required as the fuel of the ME-GI engine.
  • a fuel supply system which relates to a fuel supply system that does not use cryogenic equipment.
  • the present invention is a fuel supply system for supplying fuel to a propulsion ME-GI engine of a LEG ship (Liquefied Ethane Gas Carrier) as a first embodiment, and the BOG (Boil Off Gas) generated in the LEG storage tank A reliquefaction system for reliquefaction; An HP booster pump for pressurizing the reliquefied reliquefaction BOG in the reliquefaction system; And a heater for heating the BOG pressurized by the high pressure pump.
  • LEG ship Liiquefied Ethane Gas Carrier
  • BOG Bit Off Gas
  • Reliquefaction system comprises a compressor (compressor) for compressing the BOG generated in the LEG storage tank; And it may be to include a condenser (condenser) for condensing the BOG compressed in the compressor.
  • compressor compressor
  • condenser condenser
  • the compressor according to the embodiment may be a three stage compressor including a first compressor, a second compressor, and a third compressor.
  • the front end of the first compressor according to the embodiment may be a knockout drum (Knock Out drum) for separating the liquid component from the BOG.
  • An intermediate cooler for cooling the first compressed BOG in the first compressor is installed at the rear end of the first compressor according to the embodiment, and the third compressed BOG in the third compressor is installed at the rear end of the third compressor. After cooler (cooler) for cooling the may be installed.
  • the condenser according to the embodiment may include a cooling cycle for condensing the gas using the refrigerant.
  • the reliquefaction system may include a receiver for storing the reliquefied BOG at the rear end of the cooler, and then transferring the reliquefied BOG to a high pressure pump.
  • the BOG re-liquefied in the reliquefaction system may be a pressure of 10 ⁇ 30 bara, the temperature is -50 ⁇ -30 °C.
  • the high pressure pump according to the embodiment may be to pressurize the re-liquefied BOG to 500 ⁇ 700 bara, the required pressure of the ME-GI engine.
  • the heater according to the embodiment may be to heat the re-liquefied BOG pressurized by the high pressure pump to the required temperature of 35 ⁇ 55 °C of the ME-GI engine.
  • the present invention also provides a fuel supply method for supplying fuel to a propulsion ME-GI engine of an LEG ship, as a second preferred embodiment, comprising: (S1) reliquefying a BOG generated in a LEG storage tank; (S2) pressurizing the reliquefaction reliquefaction BOG in the step (S1); And (S3) provides a fuel supply method comprising the step of heating the re-liquefaction BOG pressurized in the step (S2).
  • step (S1) the step of compressing the BOG generated in the LEG storage tank; And reliquefying the BOG in a reliquefaction method comprising condensing the compressed BOG.
  • Compression according to the above embodiment may be a three-stage compression including primary compression, secondary compression and tertiary compression.
  • the first compression according to the embodiment may be to be first compressed after separating the liquid component contained in the BOG.
  • the first compressed BOG according to the embodiment may be second compressed after being cooled in the intermediate cooler, and the third compressed BOG may be cooled in the rear end cooler.
  • Condensation according to the embodiment may be to condense the gas by a cooling cycle using the refrigerant.
  • the step of condensing may include storing the reliquefied reliquefaction BOG.
  • the reliquefaction BOG according to the embodiment may have a pressure of 10 to 30 bara and a temperature of -50 to -30 ° C.
  • the reliquefaction BOG according to the embodiment may have a pressure of 20 to 22 bara and a temperature of -40 ° C.
  • Step (S2) may be to heat the reliquefied reliquefaction BOG pressurized in the step (S1) to the required temperature of 35 ⁇ 55 °C of the ME-GI engine.
  • the present invention also provides a third preferred embodiment, a high pressure pump for pressurizing the reliquefied reliquefaction BOG to 500 ⁇ 700 bara in the reliquefaction system of the LEG ship; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., to provide a fuel supply system for supplying fuel to the ME-GI engine for propulsion of the LEG vessel.
  • the present invention also provides a fourth preferred embodiment, wherein the reliquefed reliquefaction BOG in the reliquefaction process of the LEG vessel is pressurized and heated to 500 to 700 bara and 35 to 55 ° C, and then supplied to the ME-GI engine.
  • the present invention provides a fuel supply method for supplying fuel to a propulsion ME-GI engine of a LEG carrier.
  • the present invention also provides a fifth preferred embodiment, comprising: a high pressure pump for pressurizing the reliquefied reliquefaction BOG to 500 to 700 bara in a reliquefaction system of an LEG vessel; And a heater for heating the reliquefaction BOG pressurized by the high-pressure pump to 35 to 55 ° C., and supplying fuel to the ME-GI engine for propulsion of the LEG vessel, comprising equipment operable at -50 ° C. or more. It provides a fuel supply system for.
  • the present invention since only a high-pressure pump and a heater for satisfying the BOG liquefied by the reliquefaction system installed in the LEG ship at the required pressure and temperature of the ME-GI engine need to be separately installed, in order to fuel the BOG, The cost of having the necessary equipment can be reduced.
  • the BOG generated in the LEG storage tank is used to supply the fuel of the ME-GI engine, the internal storage pressure of the LEG storage tank can be prevented from being excessively increased by the BOG, thereby improving the storage performance of the LEG storage tank. In addition, the cost of eliminating the BOG can be reduced.
  • the equipment used for supplying BOG re-liquefied to the fuel of ME-GI engine in the reliquefaction system at a temperature of -50 ⁇ -30 °C in particular, expensive equipment such as high pressure pump, receiver, etc. It is possible to provide a fuel supply system using non-equipment.
  • FIG. 1 is a schematic block diagram illustrating a method of treating boil-off gas through re-liquefaction of boil-off gas in a LNG carrier according to the prior art.
  • FIG. 2 is a block diagram of a reliquefaction system of an LEG vessel according to the prior art.
  • FIG. 3 is a block diagram of a fuel supply system for supplying fuel to a ME-GI engine according to the prior art.
  • FIG. 4 is a block diagram of a fuel supply system according to the present invention.
  • FIG. 5 is a block diagram of a fuel supply method according to the present invention.
  • FIG. 4 is a schematic diagram of a fuel supply system according to the present invention.
  • the fuel supply system is a fuel supply system for supplying fuel to a propulsion ME-GI engine of a LEG line (Liquefied Ethane Gas carrier), and a BOG (Boil Off) generated from a LEG storage tank.
  • a reliquefaction system 100 for reliquefaction of Gas An HP booster pump (200) for pressurizing the reliquefied reliquefaction BOG in the reliquefaction system (100); And a heater 300 for heating the BOG pressurized by the high pressure pump 200.
  • Reliquefaction system 100 comprises a compressor (120) for compressing the BOG generated in the LEG storage tank; And a condenser 150 for condensing the BOG compressed by the compressor 120.
  • the compressor 120 may be a three-stage compressor including a first compressor 121, a second compressor 122, and a third compressor 123.
  • the front of the first compressor may be a knock out drum (Knock Out drum) for separating the liquid component from the BOG.
  • the BOG generated in the LEG storage tank may remove liquid components such as mist and droplets from the knockout drum before being sucked into the first compressor. Accordingly, it is possible to effectively block the liquid component flowing into the compressor to prevent shortening the life of the compressor due to the liquid component.
  • an intermediate cooler may be installed at the rear end of the first compressor to cool the first compressed BOG in the first compressor, and an after cooler may be installed at the rear end of the third compressor. Can be. The intermediate cooler and the rear cooler may prevent the temperature of the BOG from rising during the compression process.
  • the condenser 150 may condense and substantially reliquefy the BOG compressed by the compressor 120.
  • the condenser may include a cooling cycle 151 for condensing the gas using a refrigerant, and specifically, the condenser is for cooling the ethane contained in the BOG. Since ethane has a low boiling point (BP) of -88.5 ° C, it is necessary to cool and expand it separately.
  • BP low boiling point
  • ethane in the BOG compressed in the compressor may be sucked into the condenser and then condensed while being cooled by a refrigerant such as propane or propylene in a cooling cycle.
  • a refrigerant such as propane or propylene in a cooling cycle.
  • a receiver 160 may be installed to store the reliquefied BOG and then transfer the BOG to a high pressure pump.
  • the BOG re-liquefied in the reliquefaction system stored in the receiver may have a pressure of 10 to 30 bara and a temperature of -50 to -30 ° C.
  • the liquefied BOG stored in the receiver may be sequentially supplied to the high pressure pump and the heater so as to satisfy the required pressure and the required temperature of the ME-GI engine, which is the LEG ship propulsion engine.
  • the high pressure pump 200 may be to pressurize the re-liquefied BOG to 500 ⁇ 700 bar, which is the required pressure of the ME-GI engine.
  • the required pressure of the ME-GI engine is 600 bar one. Can be.
  • the heater 300 according to the present invention may be to heat the re-liquefied BOG pressurized by the high pressure pump to the required temperature of the ME-GI engine to 35 ⁇ 55 °C, preferably, the required temperature of the ME-GI engine May be 45 ° C.
  • FIG. 5 is a block diagram of a fuel supply method according to the present invention.
  • the fuel supply method according to the present invention is a fuel supply method for supplying fuel to the propulsion ME-GI engine of the LEG ship, (S1) re-liquefying the BOG generated in the LEG storage tank; (S2) pressurizing the reliquefaction reliquefaction BOG in the step (S1); And (S3) heating the reliquefaction BOG pressurized in the step (S2).
  • the fuel supply method may be using a fuel supply system as described above.
  • Reliquefaction of the step (S1) comprises the steps of compressing the BOG generated in the LEG storage tank; And reliquefying the BOG in a reliquefaction method comprising condensing the compressed BOG.
  • the compressing may be three stage compression including first compression, second compression and third compression, wherein the three compression may be performed at the first compressor, the second compressor, and the third compressor of the third compressor, respectively. May be performed.
  • the primary compression may be to be primary compression after separating the liquid component contained in the BOG.
  • the BOG may be sucked into the first compressor after removing liquid components such as mist and droplets from the knockout drum installed at the front end of the first compressor. Accordingly, it is possible to effectively block the liquid component flowing into the compressor to prevent shortening the life of the compressor due to the liquid component.
  • the primary compressed BOG may be second compressed after being cooled in the intermediate cooler, and the third compressed BOG may be cooled in the rear end cooler, thereby preventing the temperature of the BOG from rising during the compression process. Can be.
  • the third compressed BOG in the compressor is 10 to 30 bara, preferably 18 to 25 bara, more preferably 20 to 22 bara.
  • the condensing may condense substantially the BOG compressed by the compressor in a condenser.
  • the step of condensation is a step for cooling the ethane contained in the BOG using a cooler. Since ethane has a low boiling point (BP) of -88.5 ° C, it is necessary to cool and expand it separately.
  • BP low boiling point
  • the BOG compressed in the compressor may be introduced into the condenser, and then cooled and condensed in a cooling cycle using propane or propylene as a refrigerant.
  • the reliquefied reliquefaction BOG may be stored in a receiver installed at the rear of the condenser, and then transferred to a high pressure pump.
  • the reliquefied BOG regenerated in the reliquefaction system stored in the receiver may have a pressure. It may be 10 to 30 bara, preferably 18 to 25 bara, more preferably 20 to 22 bara, the temperature may be -50 ⁇ -30 °C. In addition, the reliquefaction BOG may be 20 bara and -40 °C.
  • the reliquefied reliquefaction BOG stored in the receiver may be sequentially pressurized and heated to satisfy the required pressure and the required temperature of the ME-GI engine, which is the propulsion engine of the LEG ship.
  • the step (S2) may be a step of pressurizing the reliquefied reliquefaction BOG to the required pressure of the ME-GI engine of 500 ⁇ 700 bara, preferably, may be pressurized to 600 bara.
  • the reliquefaction BOG pressurized to 600 bara in a high pressure pump may be in a liquid state with a temperature of 0 ° C.
  • the step (S3) may be a step of heating the reliquefaction BOG pressurized in the step (S2) to the required temperature of the ME-GI engine, 35 ⁇ 55 °C, preferably to 45 °C.
  • the reliquefaction BOG heated in the step (S3) may be a supercritical state of 600 bara and 45 ° C.
  • the present invention is a high-pressure pump for pressurizing the reliquefaction reliquefaction BOG 500 ⁇ 700 bara in the reliquefaction system of the LEG ship; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., and may be related to a fuel supply system for supplying fuel to a ME-GI engine for propulsion of an LEG vessel.
  • the present invention is characterized in that the reliquefaction of the re-liquefied BOG in the reliquefaction process of the LEG vessel is characterized in that the pressurized and heated to 500 ⁇ 700 bara and 35 ⁇ 55 °C and then supply to the ME-GI engine, LEG carrier (LEG carrier It may be related to a fuel supply method for supplying fuel to the propulsion ME-GI engine.
  • LEG carrier LEG carrier It may be related to a fuel supply method for supplying fuel to the propulsion ME-GI engine.
  • the present invention is a high pressure pump for pressurizing the reliquefaction reliquefaction BOG 500 ⁇ 700 bara in the reliquefaction system of the LEG ship; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., and supplying fuel to the ME-GI engine for propulsion of the LEG vessel, characterized in that it is configured to be operated at -50 ° C. or higher. It may be related to a fuel supply system for.
  • the equipment after the first compressor may be composed of equipment of -50 ° C or more, and in particular, expensive equipment such as high pressure pumps and receivers may be equipment of -50 ° C or more rather than cryogenic equipment. There is an advantage that can be used.
  • the present invention since only a high-pressure pump and a heater for satisfying the BOG liquefied by the reliquefaction system installed in the LEG ship at the required pressure and temperature of the ME-GI engine need to be separately installed, in order to fuel the BOG, The cost of having the necessary equipment can be reduced.
  • the BOG generated in the LEG storage tank is used to supply the fuel of the ME-GI engine, the internal storage pressure of the LEG storage tank can be prevented from being excessively increased by the BOG, thereby improving the storage performance of the LEG storage tank. In addition, the cost of eliminating the BOG can be reduced.
  • the cryogenic equipment in order to supply the LEG stored in the storage tank to the ME-GI engine at a temperature of -90 ° C, the cryogenic equipment should be used, but in the fuel supply system according to the present invention, the temperature of -50 to -30 ° C in the reliquefaction system Pressurized and heated to reliquefy the liquefied BOG, it is possible to configure the fuel supply system using equipment operating at -50 °C or more, not the cryogenic equipment.

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Abstract

The present invention relates to a fuel supply system and a fuel supply method and, more specifically, to a fuel supply system and a fuel supply method, which pressurize and heat boil-off gas (BOG) reliquefied by a BOG reliquefaction system of a liquefied energy gas (LEG) carrier, so as to supply the same to an ME-GI propulsion engine of the LEG carrier. According to the present invention, an economic effect can be expected, since only a high-pressure pump and a heater are separately provided so as to allow the BOG reliquefied by the reliquefaction system provided in the LEG carrier to meet a required pressure and a required temperature of the ME-GI engine and the fuel supply system can be configured without equipment for a super-low temperature.

Description

LEG선의 연료공급 시스템 및 연료공급 방법Fuel supply system and fuel supply method of LEG ship
본 발명은 LEG선의 추진 엔진으로서 사용되는 ME-GI 엔진에 적용될 수 있는 연료공급 시스템 및 연료공급 방법에 관한 것이다.The present invention relates to a fuel supply system and a fuel supply method that can be applied to a ME-GI engine used as a propulsion engine of a LEG ship.
근래, LNG(Liquefied Natural Gas)나 LPG(Liquefied Petroleum Gas) 등의 액화가스의 소비량이 전 세계적으로 급증하고 있는 추세이다. 액화가스는, 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 또는, 액화된 상태로 액화가스 운반선에 저장된 채 원거리의 소비처로 운반된다. LNG나 LPG 등의 액화가스는 천연가스 혹은 석유가스를 극저온(LNG의 경우 대략 -163℃)으로 냉각하여 얻어지는 것으로 가스 상태일 때보다 그 부피가 대폭적으로 감소되므로 해상을 통한 원거리 운반에 매우 적합하다.Recently, the consumption of liquefied gas such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) is increasing worldwide. 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 ℃ 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. .
액화가스 운반선은, 액화가스를 싣고 바다를 운항하여 육상 소요처에 이 액화가스를 하역하기 위한 것이며, 이를 위해, 액화가스의 극저온에 견딜 수 있는 저장탱크를 포함한다.The liquefied gas carrier ship is for discharging the liquefied gas to the land requirements by loading the liquefied gas into the sea and for this purpose, includes a storage tank capable of withstanding the cryogenic temperature of the liquefied gas.
이와 같이 극저온 상태의 액화가스를 저장할 수 있는 저장탱크가 마련된 해상 구조물의 예로서는 액화가스 운반선 이외에도 LNG RV (Regasification Vessel)와 같은 선박이나 LNG FSRU (Floating Storage and Regasification Unit), LNG FPSO (Floating, Production, Storage and Off-loading)와 같은 구조물 등을 들 수 있다.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, Structures such as storage and off-loading).
LNG RV는 자력 항해 및 부유가 가능한 액화가스 운반선에 LNG 재기화 설비를 설치한 것이고, LNG FSRU는 육상으로부터 멀리 떨어진 해상에서 LNG 수송선으로부터 하역되는 액화 천연가스를 저장탱크에 저장한 후 필요에 따라 액화 천연가스를 기화시켜 육상 수요처에 공급하는 해상 구조물이다. 그리고, LNG FPSO는 채굴된 천연가스를 해상에서 정제한 후 직접 액화시켜 저장탱크 내에 저장하고, 필요시 이 저장탱크 내에 저장된 LNG를 LNG 수송선으로 옮겨싣기 위해 사용되는 해상 구조물이다. 본 명세서에서 해상 구조물이란, 액화가스 운반선, LNG RV 등의 선박을 비롯하여, LNG FPSO, LNG FSRU 등의 구조물까지도 모두 포함하는 개념이다.LNG RV is a LNG regasification facility installed on a liquefied gas carrier that can be self-driving and floating. LNG FSRU stores liquefied natural gas, which is unloaded from LNG carriers, in a storage tank after liquefaction as needed. It is an offshore structure that vaporizes natural gas and supplies it to land demand. In addition, LNG FPSO is a marine structure that is used to directly purify mined natural gas from the sea and liquefy directly to store it in a storage tank, and to transfer LNG stored in the storage tank to an LNG carrier if necessary. In the present specification, the offshore structure is a concept including not only vessels such as liquefied gas carriers and LNG RVs but also structures such as LNG FPSO and LNG FSRU.
천연가스의 액화온도는 상압에서 약 -163℃의 극저온이므로, LNG는 그 온도가 상압에서 -163℃ 보다 약간만 높아도 증발된다. 종래의 LNG 운반선의 경우를 예를 들어 설명하면, LNG 운반선의 LNG 저장탱크는 단열처리가 되어 있기는 하지만, 외부의 열이 LNG에 지속적으로 전달되므로, LNG 운반선에 의해 LNG를 수송하는 도중에 LNG가 LNG 저장탱크 내에서 지속적으로 기화되어 LNG 저장 탱크 내에 증발가스(BOG; Boil-Off Gas)가 발생한다.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. In the case of a conventional LNG carrier, for example, 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.
발생된 증발가스는 저장탱크 내의 압력을 증가시키며 선박의 요동에 따라 액화가스의 유동을 가속시켜 구조적인 문제를 야기시킬 수 있기 때문에, 증발가스의 발생을 억제할 필요가 있다.Since 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.
종래, 액화가스 운반선의 저장탱크 내에서의 증발가스를 억제하기 위해, 증발가스를 저장탱크의 외부로 배출시켜 소각해 버리는 방법, 증발가스를 저장탱크의 외부로 배출시켜 재액화 장치를 통해 재액화시킨 후 다시 저장탱크로 복귀시키는 방법, 선박의 추진기관에서 사용되는 연료로서 증발가스를 사용하는 방법, 저장탱크의 내부압력을 높게 유지함으로써 증발가스의 발생을 억제하는 방법 등이 단독으로 혹은 복합적으로 사용되고 있었다.Conventionally, in order to suppress evaporated gas in a storage tank of a liquefied gas carrier, a method of discharging the evaporated gas to the outside of the storage tank for incineration, and discharging the evaporated gas to the outside of the storage tank to reliquefy through a reliquefaction apparatus. And the method of returning to the storage tank again, using the boil-off gas as fuel used in the ship's propulsion engine, and suppressing the generation of the boil-off gas by maintaining the internal pressure of the storage tank alone or in combination. It was used.
증발가스 재액화 장치가 탑재된 종래의 해상 구조물의 경우, 저장탱크의 적정 압력 유지를 위해 저장탱크 내부의 증발가스를 저장탱크 외부로 배출시켜 재액화 장치를 통해 재액화시키게 되는데, 재액화 작업이 이루어지기 전에 증발가스를 대략 4 내지 8 bara 정도의 저압으로 압축시켜 재액화 장치로 공급한다. 압축된 증발가스는 질소 냉동 사이클을 포함하는 재액화 장치에서 초저온으로 냉각된 질소와의 열교환을 통해 재액화된 후 저장탱크로 복귀된다.In the case of a conventional offshore structure equipped with a boil-off gas reliquefaction device, the boil-off gas inside the storage tank is discharged to the outside of the storage tank in order to maintain an appropriate pressure in the storage tank to be re-liquefied through the re-liquefaction device. The evaporated gas is compressed to a low pressure of approximately 4 to 8 bara and fed to the reliquefaction apparatus before it is done. The compressed boil-off gas is liquefied through heat exchange with nitrogen cooled to cryogenic temperatures in a reliquefaction apparatus including a nitrogen refrigeration cycle and then returned to the storage tank.
증발가스의 재액화 효율을 높이기 위해서는 증발가스를 높은 압력으로 압축시키는 것이 바람직하지만, 저장탱크에 저장된 LNG는 상압 상태를 유지하고 있기 때문에 재액화된 액화증발가스의 압력이 지나치게 높으면 저장탱크에 복귀할 때 플래시 가스(flash gas)가 발생하게 된다. 따라서, 재액화 효율은 낮지만 상기한 4 내지 8 bara 정도의 저압으로 증발가스를 압축할 수밖에 없다는 문제가 있다.In order to increase the efficiency of reliquefaction of the boil-off gas, it is preferable to compress the boil-off gas to a high pressure. However, since the LNG stored in the storage tank is kept at a normal pressure, if the pressure of the re-liquefied liquefied liquefied gas is too high, When flash gas (flash gas) is generated. Therefore, although the re-liquefaction efficiency is low, there is a problem in that the boil-off gas can be compressed at a low pressure of about 4 to 8 bara.
즉, 도 1에 도시된 바와 같이, 종래에는 저장탱크에서 발생된 증발가스, 즉 NBOG를 증발가스 압축기로 공급하여 대략 4 내지 8 bara 정도의 저압으로 압축시킨 후, 이 저압 BOG를 질소가스를 냉매로 사용하는 재액화 장치로 공급(대한민국 특허공개 제 10-2006-0123675 호의 상세한 설명에는 약 6.8bara로 압축하는 것이 기재되어 있고, 대한민국 특허공개 제 10-2001-0089142 호(대응 미국특허 US 6,530,241)의 상세한 설명에는 4.5bara로 압축하는 것이 기재되어 있음)한다. 재액화 장치에서 액화된 증발가스, 즉 LBOG는 저장탱크로 복귀하면서 플래시 가스가 발생하는 문제가 있었으며, 그로 인해 증발가스 압축기에서 증발가스의 압력을 저압으로 압축시킬 수밖에 없었다.That is, as shown in FIG. 1, conventionally, after supplying the boil-off gas generated in the storage tank, that is, NBOG to the boil-off gas compressor and compressing it to a low pressure of about 4 to 8 bara, the low-pressure BOG is a nitrogen gas refrigerant. Supplied to a reliquefaction apparatus for use in Korea (Detailed description of Korean Patent Publication No. 10-2006-0123675 describes compression to about 6.8 bara, Korean Patent Publication No. 10-2001-0089142 (corresponding US Patent US 6,530,241) In the detailed description of compression to 4.5 bara is described). In the reliquefaction apparatus, the liquefied boil-off gas, that is, LBOG, had a problem in that flash gas was generated when it returned to the storage tank, thereby compressing the pressure of the boil-off gas to a low pressure in the boil-off gas compressor.
결국, 종래에는 저장탱크에서 발생되는 증발가스는 재액화 장치를 통해 재액화한 후 저장탱크에 복귀시키는 것이 전형적인 증발가스 처리방법으로 활용되고 있었으며, 재액화 이후 저장탱크 복귀시 플래시 가스 발생을 가능한 한 억제하기 위해 재액화되는 증발가스의 압력을 높이지 않는 것이 기본적인 개념으로 굳어져 있었다.As a result, conventionally, the evaporated gas generated from the storage tank is re-liquefied through the reliquefaction apparatus and then returned to the storage tank. As a typical method of treating the evaporated gas, the flash gas is generated as much as possible. The basic concept was to not raise the pressure of the re-liquefied boil-off gas to suppress it.
증발가스를 재액화시키는 재액화 장치로서는 국제특허공개 WO 2007/117148 호 공보, WO 2009/136793 호 공보 및 WO 2011/078689 호 공보, 한국특허공개 제2006-0123675호 공보, 한국특허공개 제2001-0089142호 공보 등에 개시되어 있는 질소 냉동 사이클이나, 그 이외에 혼합냉매 사이클 등이 이용되고 있었다. 위에서 설명한 바와 같이, 이와 같은 종래의 증발가스 재액화장치는 증발가스를 재액화할 때는 보통 4 ~ 8 bara 내외에서 가압하여 재액화하는 것이 일반적이고, 당업계에서는 그 이상으로 가압하는 것은 기술적으로 타당하지 못하다는 인식이 널리 퍼져 있었다. 그 이유는, 증발가스를 재액화할 때, 증발가스가 높은 압력에서 재액화되면 나중에 탱크로 되돌려 보낼 경우, 상압 근처로 압력이 낮아지므로 플래시 가스(증발가스)가 많이 생기기 때문이다.Examples of reliquefaction apparatuses for reliquefaction of boil-off gas include International Patent Publications WO 2007/117148, WO 2009/136793, and WO 2011/078689, Korean Patent Publication No. 2006-0123675, and Korean Patent Publication No. 2001-0089142 Nitrogen refrigeration cycles disclosed in Japanese Patent Application Laid-Open and the like, mixed refrigerant cycles and the like have been used. As described above, in such a conventional boil-off gas reliquefaction apparatus, when re-liquefying the boil-off gas, it is generally pressurized at about 4 to 8 bara to reliquefy, and in the art, it is technically reasonable to pressurize more than that. There was widespread perception that they could not. The reason for this is that when the liquefied evaporated gas is reliquefied at a high pressure, when the vaporized gas is later returned to the tank, the pressure is lowered near the normal pressure, so that a lot of flash gas (evaporated gas) is generated.
한편, 질소 냉동 사이클은 냉매로서 질소가스(N2)를 사용하여 액화 효율이 낮은 문제가 있고, 혼합냉매 사이클은 냉매로서 질소와 탄화수소 가스 등이 혼합된 냉매를 사용하기 때문에 안정성이 떨어지는 문제가 있다.On the other hand, the nitrogen refrigeration cycle has a problem of low liquefaction efficiency using nitrogen gas (N 2 ) as the refrigerant, and the mixed refrigerant cycle has a problem of low stability because it uses a refrigerant in which nitrogen and hydrocarbon gas are mixed as the refrigerant. .
더욱 상세하게는, 종래의 선박이나 해상 플랜트 등의 해상용 LNG 재액화 장치에서는 터보 팽창기(tubo expander) 방식의 질소 역브레이튼 사이클을 구현하여 증발가스를 재액화하였고, 육상용 LNG 액화 플랜트에서는 혼합냉매를 이용하는 줄-톰슨 냉동 사이클을 구현하여 천연가스를 액화시켰다. 해상용으로 사용하던 질소 역브레이튼 사이클은 상대적으로 장치의 구성이 단순하여 공간이 한정된 선박이나 해상 구조물에서 유리하지만 효율이 낮은 문제가 있고, 육상용으로 사용하던 혼합냉매 줄-톰슨 냉동 사이클은 상대적으로 효율이 높지만 혼합냉매의 특성상 기액상태가 동시에 존재할 때 이를 분리하기 위한 세퍼레이터를 사용해야 하는 등 장치 구성이 복잡해지는 문제가 있다. 하지만 이러한 재액화 방식은 아직 많이 사용되고 있다.More specifically, in a conventional LNG reliquefaction apparatus such as a ship or a marine plant, a turbo expander-type nitrogen reverse Brayton cycle was implemented to reliquefy the boil-off gas, and a mixed refrigerant in a land LNG liquefaction plant. A Joule-Thompson refrigeration cycle was implemented to liquefy natural gas. Nitrogen reverse Brayton cycles used for marine use are advantageous in ships or offshore structures where space is limited due to their relatively simple configuration, but have low efficiency. The mixed refrigerant Joule-Thomson refrigeration cycles used for land use are relatively Although the efficiency is high, due to the characteristics of the mixed refrigerant, there is a problem in that the device configuration is complicated, such as the use of a separator to separate when a gas-liquid state exists at the same time. However, this reliquefaction method is still widely used.
그 밖에도 LNG 등의 액화가스를 저장하는 저장탱크를 구비한 해상 구조물에 대하여, 저장탱크에서 지속적으로 발생하는 증발가스를 효율적으로 처리할 수 있는 방법에 대한 연구 개발이 계속해서 이루어지고 있다.In addition, research and development of a method for efficiently treating the boil-off gas continuously generated in the storage tank is continuously conducted for offshore structures having a storage tank for storing liquefied gas such as LNG.
한편, 최근에는 LNG 선 이외에 LEG(Liquefied Ethane Gas) 선이 고부가가치 선박으로 각광받고 있어, LEG 선에서도 LEG 저장탱크에서 발생하는 증발가스를 효율적으로 처리할 수 있는 방법에 대한 관심이 높아지고 있다.On the other hand, in recent years, since the LEG (Liquefied Ethane Gas) line has been spotlighted as a high value-added vessel in addition to LNG carriers, there is a growing interest in how to efficiently treat the boil-off gas generated in the LEG storage tank.
지금까지는 LEG 선의 저장탱크에서 발생하는 증발가스는 도 2에 도시된 바와 같은 재액화 시스템을 이용하여 재액화된 후, 저장탱크로 다시 되돌려 보내지는 방법에 의해 증발가스가 처리되었다.Until now, the boil-off gas generated in the storage tank of the LEG line has been re-liquefied using a re-liquefaction system as shown in FIG. 2, and then the boil-off gas has been treated by a method of returning it back to the storage tank.
또한, 도 3에 도시된 바와 같이, LEG 선의 저장탱크에 저장된 LEG는 저압 펌프 및 고압 펌프를 이용하여 가압된 뒤, 히터에서 가열되어 LEG 선의 추진용 ME-GI 엔진의 연료로서 공급될 수 있는데, LEG 저장탱크에서 발생하는 증발가스를 처리하는 방법 중 하나로, LEG 선의 추진용 ME-GI 엔진에 공급되는 연료로서 저장탱크에서 발생하는 증발가스를 이용하는 기술에 대한 연구 개발이 요구되고 있다. 또한, LEG선의 저장탱크에 저장된 LEG는 -90℃로서, 저압 펌프, 고압 펌프, 히터 등의 장비로서 초저온용 장비를 사용해야만 하는 문제가 있어, 초저온용 장비를 사용하지 연료 공급 시스템에 대한 기술 개발이 요구되고 있다.In addition, as shown in FIG. 3, the LEG stored in the storage tank of the LEG vessel may be pressurized using a low pressure pump and a high pressure pump, and then heated in a heater to be supplied as fuel of the ME-GI engine for propulsion of the LEG vessel. As one of the methods of treating the boil-off gas generated in the LEG storage tank, research and development on the technology using the boil-off gas generated in the storage tank as fuel supplied to the propulsion ME-GI engine of the LEG ship is required. In addition, the LEG stored in the storage tank of the LEG ship is -90 ℃, there is a problem that the cryogenic equipment must be used as equipment such as low pressure pump, high pressure pump, heater, etc., the technology development for fuel supply system not using cryogenic equipment This is required.
본 발명은 LEG선에 설치되어 있는 재액화 시스템을 이용하여, LEG 저장탱크에서 발생하는 BOG를 ME-GI 엔진의 연료로서 요구되는 조건을 만족시키도록 하여 ME-GI 엔진의 연료로 공급하는 연료 공급 시스템에 관한 것이다.The present invention uses a reliquefaction system installed in the LEG ship, the fuel supply to supply the fuel of the ME-GI engine to the BOG generated in the LEG storage tank to satisfy the conditions required as the fuel of the ME-GI engine It's about the system.
본 발명은 또한, LEG선에 설치되어 있는 재액화 시스템을 이용하여, LEG 저장탱크에서 발생하는 BOG를 ME-GI 엔진의 연료로서 요구되는 조건을 만족시키도록 하여 ME-GI 엔진의 연료로 공급하는 연료 공급 방법에 관한 것이다.The present invention also uses a reliquefaction system provided on the LEG vessel, and supplies the BOG generated in the LEG storage tank to the fuel of the ME-GI engine so as to satisfy the conditions required as the fuel of the ME-GI engine. It relates to a fuel supply method.
본 발명은 또한, LEG선에 설치되어 있는 재액화 시스템을 이용하여, LEG 저장탱크에서 발생하는 BOG를 ME-GI 엔진의 연료로서 요구되는 조건을 만족시키도록 하여 ME-GI 엔진의 연료로 공급하는 연료 공급 시스템으로서, 초저온용 장비를 이용하지 않는 연료 공급 시스템에 관한 것이다.The present invention also uses a reliquefaction system provided on the LEG vessel, and supplies the BOG generated in the LEG storage tank to the fuel of the ME-GI engine so as to satisfy the conditions required as the fuel of the ME-GI engine. A fuel supply system, which relates to a fuel supply system that does not use cryogenic equipment.
이에 본 발명은 바람직한 제1 구현예로서, LEG선(Liquefied Ethane Gas carrier)의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템으로서, LEG 저장탱크에서 발생하는 BOG(Boil Off Gas)를 재액화시키는 재액화 시스템; 상기 재액화 시스템에서 재액화된 재액화 BOG를 가압하는 고압 펌프(HP booster pump); 및 상기 고압 펌프에서 가압된 BOG를 가열하는 히터(heater)를 포함하는 연료 공급 시스템을 제공한다.Accordingly, the present invention is a fuel supply system for supplying fuel to a propulsion ME-GI engine of a LEG ship (Liquefied Ethane Gas Carrier) as a first embodiment, and the BOG (Boil Off Gas) generated in the LEG storage tank A reliquefaction system for reliquefaction; An HP booster pump for pressurizing the reliquefied reliquefaction BOG in the reliquefaction system; And a heater for heating the BOG pressurized by the high pressure pump.
상기 구현예에 의한 재액화 시스템은 LEG 저장탱크에서 발생한 BOG를 압축시키는 컴프레서(compressor); 및 상기 컴프레서에서 압축된 BOG를 응축시키는 응축기(condenser)를 포함하는 것일 수 있다.Reliquefaction system according to the embodiment comprises a compressor (compressor) for compressing the BOG generated in the LEG storage tank; And it may be to include a condenser (condenser) for condensing the BOG compressed in the compressor.
상기 구현예에 의한 컴프레서는 제1 컴프레서, 제2 컴프레서 및 제3 컴프레서를 포함하는 3단 컴프레서인 것일 수 있다.The compressor according to the embodiment may be a three stage compressor including a first compressor, a second compressor, and a third compressor.
상기 구현예에 의한 제1 컴프레서의 전단에는 BOG로부터 액상 성분을 분리해내기 위한 녹아웃 드럼(Knock Out drum)이 설치된 것일 수 있다.The front end of the first compressor according to the embodiment may be a knockout drum (Knock Out drum) for separating the liquid component from the BOG.
상기 구현예에 의한 제1 컴프레서의 후단에는 제1 컴프레서에서 1차 압축된 BOG를 냉각시키기 위한 중간 냉각기(intermediate cooler)가 설치되고, 상기 제3 컴프레서의 후단에는 제3 컴프레서에서 3차 압축된 BOG를 냉각시키기 위한 후단 냉각기(after cooler)가 설치된 것일 수 있다.An intermediate cooler for cooling the first compressed BOG in the first compressor is installed at the rear end of the first compressor according to the embodiment, and the third compressed BOG in the third compressor is installed at the rear end of the third compressor. After cooler (cooler) for cooling the may be installed.
상기 구현예에 의한 응축기는 냉매를 이용하여 가스를 응축시키는 냉각 사이클을 포함하는 것일 수 있다.The condenser according to the embodiment may include a cooling cycle for condensing the gas using the refrigerant.
상기 구현예에 의한 재액화 시스템은 상기 냉각기의 후단에 재액화된 BOG를 저장한 후, 고압 펌프로 이송하기 위한 리시버(Receiver)를 포함하는 것일 수 있다.The reliquefaction system according to the embodiment may include a receiver for storing the reliquefied BOG at the rear end of the cooler, and then transferring the reliquefied BOG to a high pressure pump.
상기 구현예에 의한 리시버에 저장되며, 재액화 시스템에서 재액화된 BOG는 압력이 10 ~ 30 bara 이고, 온도가 -50 ~ -30 ℃인 것일 수 있다.Stored in the receiver according to the embodiment, the BOG re-liquefied in the reliquefaction system may be a pressure of 10 ~ 30 bara, the temperature is -50 ~ -30 ℃.
상기 구현예에 의한 고압 펌프는 재액화된 BOG를 ME-GI 엔진의 요구 압력인 500 ~ 700 bara로 가압하는 것일 수 있다.The high pressure pump according to the embodiment may be to pressurize the re-liquefied BOG to 500 ~ 700 bara, the required pressure of the ME-GI engine.
상기 구현예에 의한 히터는 고압 펌프에서 가압된 재액화된 BOG를 ME-GI 엔진의 요구 온도인 35 ~ 55 ℃로 가열하는 것일 수 있다.The heater according to the embodiment may be to heat the re-liquefied BOG pressurized by the high pressure pump to the required temperature of 35 ~ 55 ℃ of the ME-GI engine.
본 발명은 또한 바람직한 제2 구현예로서, LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 방법으로서, (S1) LEG 저장탱크에서 발생한 BOG를 재액화시키는 단계; (S2) 상기 (S1) 단계에서 재액화된 재액화 BOG를 가압하는 단계; 및 (S3) 상기 (S2) 단계에서 가압된 재액화 BOG를 가열하는 단계를 포함하는 연료 공급 방법을 제공한다.The present invention also provides a fuel supply method for supplying fuel to a propulsion ME-GI engine of an LEG ship, as a second preferred embodiment, comprising: (S1) reliquefying a BOG generated in a LEG storage tank; (S2) pressurizing the reliquefaction reliquefaction BOG in the step (S1); And (S3) provides a fuel supply method comprising the step of heating the re-liquefaction BOG pressurized in the step (S2).
상기 구현예에 의한 (S1) 단계의 재액화는, 상기 LEG 저장탱크에서 발생한 BOG를 압축시키는 단계; 및 상기 압축된 BOG를 응축시키는 단계를 포함하는 재액화 방법에 BOG를 재액화시키는 것일 수 있다.Reliquefaction of step (S1) according to the embodiment, the step of compressing the BOG generated in the LEG storage tank; And reliquefying the BOG in a reliquefaction method comprising condensing the compressed BOG.
상기 구현예에 의한 압축은 1차 압축, 2차 압축 및 3차 압축을 포함하는 3단 압축인 것일 수 있다.Compression according to the above embodiment may be a three-stage compression including primary compression, secondary compression and tertiary compression.
상기 구현예에 의한 1차 압축은 BOG에 포함된 액상 성분을 분리해낸 후 1차 압축되는 것일 수 있다.The first compression according to the embodiment may be to be first compressed after separating the liquid component contained in the BOG.
상기 구현예에 의한 1차 압축된 BOG는 중간 냉각기에서 냉각된 후 2차 압축되고, 상기 3차 압축된 BOG는 후단 냉각기에서 냉각되는 것일 수 있다.The first compressed BOG according to the embodiment may be second compressed after being cooled in the intermediate cooler, and the third compressed BOG may be cooled in the rear end cooler.
상기 구현예에 의한 응축은 냉매를 이용하는 냉각 사이클에 의해 가스를 응축시키는 것일 수 있다.Condensation according to the embodiment may be to condense the gas by a cooling cycle using the refrigerant.
상기 구현예에 의한 응축시키는 단계 후에, 재액화된 재액화 BOG를 저장하는 단계를 포함하는 것일 수 있다.After the step of condensing according to the embodiment, it may include storing the reliquefied reliquefaction BOG.
상기 구현예에 의한 재액화 BOG는 압력이 10 ~ 30 bara 이고, 온도가 -50 ~ -30 ℃인 것일 수 있다.The reliquefaction BOG according to the embodiment may have a pressure of 10 to 30 bara and a temperature of -50 to -30 ° C.
상기 구현예에 의한 상기 재액화 BOG는 압력이 20 ~ 22 bara 이고, 온도가 -40 ℃인 것일 수 있다.The reliquefaction BOG according to the embodiment may have a pressure of 20 to 22 bara and a temperature of -40 ° C.
상기 구현예에 의한 (S1) 단계는 재액화된 BOG를 ME-GI 엔진의 요구 압력인 500 ~ 700 bara로 가압하는 것일 수 있다.Step (S1) according to the embodiment may be to pressurize the re-liquefied BOG to 500 ~ 700 bara, the required pressure of the ME-GI engine.
상기 구현예에 의한 (S2) 단계는 (S1) 단계에서 가압된 재액화된 재액화 BOG를 ME-GI 엔진의 요구 온도인 35 ~ 55 ℃로 가열하는 것일 수 있다.Step (S2) according to the embodiment may be to heat the reliquefied reliquefaction BOG pressurized in the step (S1) to the required temperature of 35 ~ 55 ℃ of the ME-GI engine.
본 발명은 또한 바람직한 제3 구현예로서, LEG선의 재액화 시스템에서 재액화된 재액화 BOG를 500 ~ 700 bara로 가압하는 고압 펌프; 및 상기 고압 펌프에서 가압된 재액화 BOG를 35 ~ 55 ℃로 가열하는 히터를 포함하는, LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템을 제공한다.The present invention also provides a third preferred embodiment, a high pressure pump for pressurizing the reliquefied reliquefaction BOG to 500 ~ 700 bara in the reliquefaction system of the LEG ship; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., to provide a fuel supply system for supplying fuel to the ME-GI engine for propulsion of the LEG vessel.
본 발명은 또한 바람직한 제4 구현예로서, LEG선의 재액화 공정에서 재액화된 재액화 BOG를 500 ~ 700 bara 및 35 ~ 55 ℃로 가압 및 가열한 다음 ME-GI 엔진에 공급하는 것을 특징으로 하는, LEG선(LEG carrier)의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 방법을 제공한다.The present invention also provides a fourth preferred embodiment, wherein the reliquefed reliquefaction BOG in the reliquefaction process of the LEG vessel is pressurized and heated to 500 to 700 bara and 35 to 55 ° C, and then supplied to the ME-GI engine. In addition, the present invention provides a fuel supply method for supplying fuel to a propulsion ME-GI engine of a LEG carrier.
본 발명은 또한 바람직한 제5 구현예로서, LEG선의 재액화 시스템에서 재액화된 재액화 BOG를 500 ~ 700 bara로 가압하는 고압 펌프; 및 상기 고압 펌프에서 가압된 재액화 BOG를 35 ~ 55 ℃로 가열하는 히터를 포함하되, -50℃ 이상에서 작동 가능한 장비를 포함하는 것을 특징으로 하는 LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템을 제공한다.The present invention also provides a fifth preferred embodiment, comprising: a high pressure pump for pressurizing the reliquefied reliquefaction BOG to 500 to 700 bara in a reliquefaction system of an LEG vessel; And a heater for heating the reliquefaction BOG pressurized by the high-pressure pump to 35 to 55 ° C., and supplying fuel to the ME-GI engine for propulsion of the LEG vessel, comprising equipment operable at -50 ° C. or more. It provides a fuel supply system for.
본 발명에 의하면, LEG선에 설치되어 있는 재액화 시스템에 의해 재액화된 BOG를 ME-GI 엔진의 요구 압력 및 요구 온도로 만족시키기 위한 고압 펌프 및 히터만을 별도로 설치하면 되므로, BOG를 연료화하기 위하여 필요한 장비를 구비하기 위한 비용을 절감할 수 있다.According to the present invention, since only a high-pressure pump and a heater for satisfying the BOG liquefied by the reliquefaction system installed in the LEG ship at the required pressure and temperature of the ME-GI engine need to be separately installed, in order to fuel the BOG, The cost of having the necessary equipment can be reduced.
또한, LEG 저장탱크에서 발생하는 BOG를 이용하여, ME-GI 엔진의 연료로 공급하므로, BOG에 의해 LEG 저장탱크의 내부 압력이 과도하게 증가하는 것을 방지하여 LEG 저장탱크의 저장성을 향상시킬 수 있을 뿐만 아니라 BOG를 제거하기 위하여 별도로 소모되는 비용을 절감할 수 있다. In addition, since the BOG generated in the LEG storage tank is used to supply the fuel of the ME-GI engine, the internal storage pressure of the LEG storage tank can be prevented from being excessively increased by the BOG, thereby improving the storage performance of the LEG storage tank. In addition, the cost of eliminating the BOG can be reduced.
또한, 재액화 시스템에서 -50 ~ -30 ℃의 온도로 재액화된 BOG를 ME-GI 엔진의 연료로 공급하기 위해 사용되는 장비, 특히, 고압 펌프, 리시버 등의 고가의 장비를 초저온용 장비가 아닌 장비를 사용하는 연료 공급 시스템을 제공할 수 있다.In addition, the equipment used for supplying BOG re-liquefied to the fuel of ME-GI engine in the reliquefaction system at a temperature of -50 ~ -30 ℃, in particular, expensive equipment such as high pressure pump, receiver, etc. It is possible to provide a fuel supply system using non-equipment.
도 1은 종래기술에 따른 LNG 운반선에서 증발가스 재액화를 통한 증발가스 처리 방법을 설명하기 위한 개략적인 블록도이다.1 is a schematic block diagram illustrating a method of treating boil-off gas through re-liquefaction of boil-off gas in a LNG carrier according to the prior art.
도 2는 종래 기술에 따른 LEG선의 재액화 시스템의 블록도이다.2 is a block diagram of a reliquefaction system of an LEG vessel according to the prior art.
도 3은 종래 기술에 따른 ME-GI 엔진에 연료를 공급하는 연료 공급 시스템의 블록도이다.3 is a block diagram of a fuel supply system for supplying fuel to a ME-GI engine according to the prior art.
도 4는 본 발명에 따른 연료 공급 시스템의 블록도이다.4 is a block diagram of a fuel supply system according to the present invention.
도 5는 본 발명에 따른 연료 공급 방법의 블록도이다.5 is a block diagram of a fuel supply method according to the present invention.
이하, 본 발명을 도면을 참조하여 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the drawings.
도 4에는 본 발명에 따른 연료 공급 시스템의 모식도가 도시되어 있다.4 is a schematic diagram of a fuel supply system according to the present invention.
도 4를 참조하면, 본 발명에 따른 연료 공급 시스템은 LEG선(Liquefied Ethane Gas carrier)의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템으로서, LEG 저장탱크에서 발생하는 BOG(Boil Off Gas)를 재액화시키는 재액화 시스템(100); 상기 재액화 시스템(100)에서 재액화된 재액화 BOG를 가압하는 고압 펌프(HP booster pump)(200); 및 상기 고압 펌프(200)에서 가압된 BOG를 가열하는 히터(heater)(300)를 포함할 수 있다.Referring to FIG. 4, the fuel supply system according to the present invention is a fuel supply system for supplying fuel to a propulsion ME-GI engine of a LEG line (Liquefied Ethane Gas carrier), and a BOG (Boil Off) generated from a LEG storage tank. A reliquefaction system 100 for reliquefaction of Gas); An HP booster pump (200) for pressurizing the reliquefied reliquefaction BOG in the reliquefaction system (100); And a heater 300 for heating the BOG pressurized by the high pressure pump 200.
[재액화 시스템]Reliquefaction System
본 발명에 따른 재액화 시스템(100)은 LEG 저장탱크에서 발생한 BOG를 압축시키는 컴프레서(compressor)(120); 및 상기 컴프레서(120)에서 압축된 BOG를 응축시키는 응축기(condenser)(150)를 포함할 수 있다. Reliquefaction system 100 according to the present invention comprises a compressor (120) for compressing the BOG generated in the LEG storage tank; And a condenser 150 for condensing the BOG compressed by the compressor 120.
상기 컴프레서(120)는 제1 컴프레서(121), 제2 컴프레서(122) 및 제3 컴프레서(123)를 포함하는 3단 컴프레서인 것일 수 있다.The compressor 120 may be a three-stage compressor including a first compressor 121, a second compressor 122, and a third compressor 123.
한편, 제1 컴프레서의 전단에는 BOG로부터 액상 성분을 분리해내기 위한 녹아웃 드럼(Knock Out drum)이 설치된 것일 수 있다. 상기 LEG 저장탱크에서 발생한 BOG는 제1 컴프레서로 흡입되기 전, 상기 녹아웃 드럼에서 미스트(mist), 액적(droplet) 등의 액상 성분을 제거할 수 있다. 이에 따라, 컴프레서로 유입되는 액상 성분을 효과적으로 차단하여 액상 성분으로 인한 컴프레서의 수명 단축을 방지할 수 있다.On the other hand, the front of the first compressor may be a knock out drum (Knock Out drum) for separating the liquid component from the BOG. The BOG generated in the LEG storage tank may remove liquid components such as mist and droplets from the knockout drum before being sucked into the first compressor. Accordingly, it is possible to effectively block the liquid component flowing into the compressor to prevent shortening the life of the compressor due to the liquid component.
또한, 상기 제1 컴프레서의 후단에는 제1 컴프레서에서 1차 압축된 BOG를 냉각시키기 위한 중간 냉각기(intermediate cooler)가 설치될 수 있고, 상기 제3 컴프레서의 후단에서 후단 냉각기(after cooler)가 설치될 수 있다. 상기 중간 냉각기 및 후단 냉각기에 의해 압축 과정에서 BOG의 온도가 상승하는 것을 방지할 수 있다.In addition, an intermediate cooler may be installed at the rear end of the first compressor to cool the first compressed BOG in the first compressor, and an after cooler may be installed at the rear end of the third compressor. Can be. The intermediate cooler and the rear cooler may prevent the temperature of the BOG from rising during the compression process.
상기 응축기(150)는 컴프레서(120)에 의해 압축된 BOG를 응축시켜 실질적으로 재액화시킬 수 있다.The condenser 150 may condense and substantially reliquefy the BOG compressed by the compressor 120.
상기 응축기는 냉매를 이용하여 가스를 응축시키는 냉각 사이클(151)을 포함할 수 있으며, 구체적으로는, 상기 응축기는은 BOG에 포함된 에탄을 냉각시키기 위한 것이다. 에탄은 끓는점이(BP, boiling point)이 -88.5℃로 낮으므로, 별도로 냉각하여 팽창시킬 필요가 있다. The condenser may include a cooling cycle 151 for condensing the gas using a refrigerant, and specifically, the condenser is for cooling the ethane contained in the BOG. Since ethane has a low boiling point (BP) of -88.5 ° C, it is necessary to cool and expand it separately.
즉, 컴프레서에서 압축된 BOG 중 에탄이 응축기로 흡입된 후 냉각 사이클에서 프로판, 프로필렌 등의 냉매에 의해 냉각되면서 응축될 수 있다.That is, ethane in the BOG compressed in the compressor may be sucked into the condenser and then condensed while being cooled by a refrigerant such as propane or propylene in a cooling cycle.
상기 응축기의 후단에는 재액화된 BOG를 저장한 후, 고압 펌프로 이송하기 위한 리시버(Receiver)(160)가 설치되어 있을 수 있다. 상기 리시버에 저장된, 상기 재액화 시스템에서 재액화된 BOG는 압력이 10 ~ 30 bara 이고, 온도가 -50 ~ -30 ℃일 수 있다.At the rear end of the condenser, a receiver 160 may be installed to store the reliquefied BOG and then transfer the BOG to a high pressure pump. The BOG re-liquefied in the reliquefaction system stored in the receiver may have a pressure of 10 to 30 bara and a temperature of -50 to -30 ° C.
한편, 상기 리시버에 저장된 재액화된 BOG는, LEG선의 추진용 엔진인 ME-GI 엔진의 요구 압력 및 요구 온도를 만족시키도록 고압 펌프 및 히터에 순차적으로 공급될 수 있다.Meanwhile, the liquefied BOG stored in the receiver may be sequentially supplied to the high pressure pump and the heater so as to satisfy the required pressure and the required temperature of the ME-GI engine, which is the LEG ship propulsion engine.
[고압 펌프][High pressure pump]
본 발명에 따른 고압 펌프(200)는 재액화된 BOG를 ME-GI 엔진의 요구 압력인 500 ~ 700 bar로 가압하는 것일 수 있으며, 바람직하게는, 상기 ME-GI 엔진의 요구 압력은 600 bar 일 수 있다.The high pressure pump 200 according to the present invention may be to pressurize the re-liquefied BOG to 500 ~ 700 bar, which is the required pressure of the ME-GI engine. Preferably, the required pressure of the ME-GI engine is 600 bar one. Can be.
[히터][heater]
본 발명에 따른 히터(300)는 고압 펌프에서 가압된 재액화된 BOG를 ME-GI 엔진의 요구 온도인 35 ~ 55 ℃로 가열하는 것일 수 있으며, 바람직하게는, 상기 ME-GI 엔진의 요구 온도는 45 ℃일 수 있다.The heater 300 according to the present invention may be to heat the re-liquefied BOG pressurized by the high pressure pump to the required temperature of the ME-GI engine to 35 ~ 55 ℃, preferably, the required temperature of the ME-GI engine May be 45 ° C.
도 5에는 본 발명에 따른 연료 공급 방법의 블록도가 도시되어 있다.5 is a block diagram of a fuel supply method according to the present invention.
도 5를 참조하면, 본 발명에 따른 연료 공급 방법은 LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 방법으로서, (S1) LEG 저장탱크에서 발생한 BOG를 재액화시키는 단계; (S2) 상기 (S1) 단계에서 재액화된 재액화 BOG를 가압하는 단계; 및 (S3) 상기 (S2) 단계에서 가압된 재액화 BOG를 가열하는 단계를 포함할 수 있다.Referring to Figure 5, the fuel supply method according to the present invention is a fuel supply method for supplying fuel to the propulsion ME-GI engine of the LEG ship, (S1) re-liquefying the BOG generated in the LEG storage tank; (S2) pressurizing the reliquefaction reliquefaction BOG in the step (S1); And (S3) heating the reliquefaction BOG pressurized in the step (S2).
상기 연료 공급 방법은 전술한 바와 같은 연료 공급 시스템을 이용한 것일 수 있다.The fuel supply method may be using a fuel supply system as described above.
[(S1) 단계][(S1) step]
본 발명에 따른 상기 (S1) 단계의 재액화는 상기 LEG 저장탱크에서 발생한 BOG를 압축시키는 단계; 및 상기 압축된 BOG를 응축시키는 단계를 포함하는 재액화 방법에 BOG를 재액화시키는 것일 수 있다.Reliquefaction of the step (S1) according to the present invention comprises the steps of compressing the BOG generated in the LEG storage tank; And reliquefying the BOG in a reliquefaction method comprising condensing the compressed BOG.
상기 압축시키는 단계는 1차 압축, 2차 압축 및 3차 압축을 포함하는 3단 압축인 것일 수 있으며, 상기 3단 압축은 각각 상기 3단 컴프레서의 제1 컴프레서, 제2 컴프레서 및 제3 컴프레서에서 수행되는 것일 수 있다.The compressing may be three stage compression including first compression, second compression and third compression, wherein the three compression may be performed at the first compressor, the second compressor, and the third compressor of the third compressor, respectively. May be performed.
상기 1차 압축은 BOG에 포함된 액상 성분을 분리해낸 후 1차 압축되는 것일 수 있다. 구체적으로는, 상기 BOG는 제1 컴프레서의 전단에 설치된 녹아웃 드럼(Knock Out drum)에서 미스트(mist), 액적(droplet) 등의 액상 성분이 제거된 후 제1 컴프레서로 흡입될 수 있다. 이에 따라, 컴프레서로 유입되는 액상 성분을 효과적으로 차단하여 액상 성분으로 인한 컴프레서의 수명 단축을 방지할 수 있다.The primary compression may be to be primary compression after separating the liquid component contained in the BOG. Specifically, the BOG may be sucked into the first compressor after removing liquid components such as mist and droplets from the knockout drum installed at the front end of the first compressor. Accordingly, it is possible to effectively block the liquid component flowing into the compressor to prevent shortening the life of the compressor due to the liquid component.
또한, 상기 1차 압축된 BOG는 중간 냉각기에서 냉각된 후 2차 압축될 수 있고, 상기 3차 압축된 BOG는 상기 후단 냉각기에서 냉각될 수 있어, 압축 과정에서 BOG의 온도가 상승하는 것을 방지할 수 있다.In addition, the primary compressed BOG may be second compressed after being cooled in the intermediate cooler, and the third compressed BOG may be cooled in the rear end cooler, thereby preventing the temperature of the BOG from rising during the compression process. Can be.
상기 컴프레서에서 3차 압축된 BOG는 10 ~ 30 bara 이고, 바람직하게는 18 ~ 25 bara, 보다 바람직하게는 20 ~ 22bara일 수 있다.The third compressed BOG in the compressor is 10 to 30 bara, preferably 18 to 25 bara, more preferably 20 to 22 bara.
상기 응축시키는 단계는 상기 컴프레서에 의해 압축된 BOG를 응축기에서 응축시켜 실질적으로 재액화시킬 수 있다. 구체적으로, 응축시키는 단계는 BOG에 포함된 에탄을 냉각기를 이용하여 냉각시키기 위한 단계이다. 에탄은 끓는점이(BP, boiling point)이 -88.5℃로 낮으므로, 별도로 냉각하여 팽창시킬 필요가 있다. The condensing may condense substantially the BOG compressed by the compressor in a condenser. Specifically, the step of condensation is a step for cooling the ethane contained in the BOG using a cooler. Since ethane has a low boiling point (BP) of -88.5 ° C, it is necessary to cool and expand it separately.
컴프레서에서 압축된 BOG는 응축기로 유입된 후, 프로판, 프로필렌 등을 냉매로 사용하는 냉각 사이클에서 냉각되어 응축될 수 있다.The BOG compressed in the compressor may be introduced into the condenser, and then cooled and condensed in a cooling cycle using propane or propylene as a refrigerant.
이와 같은 과정을 거쳐 재액화된 재액화 BOG는 상기 응축기의 후단에 설치된 리시버에 저장된 후, 고압 펌프로 이송될 수 있으며, 이때, 상기 리시버에 저장된, 상기 재액화 시스템에서 재액화된 BOG는 압력이 10 ~ 30 bara 이고, 바람직하게는 18 ~ 25 bara, 보다 바람직하게는 20 ~ 22bara일 수 있으며, 온도는 -50 ~ -30 ℃일 수 있다. 또한, 상기 재액화 BOG는 20 bara 및 -40℃일 수 있다.Through this process, the reliquefied reliquefaction BOG may be stored in a receiver installed at the rear of the condenser, and then transferred to a high pressure pump. In this case, the reliquefied BOG regenerated in the reliquefaction system stored in the receiver may have a pressure. It may be 10 to 30 bara, preferably 18 to 25 bara, more preferably 20 to 22 bara, the temperature may be -50 ~ -30 ℃. In addition, the reliquefaction BOG may be 20 bara and -40 ℃.
상기 리시버에 저장된 재액화된 재액화 BOG는, LEG선의 추진용 엔진인 ME-GI 엔진의 요구 압력 및 요구 온도를 만족시키도록 순차적으로 가압 및 가열될 수 있다.The reliquefied reliquefaction BOG stored in the receiver may be sequentially pressurized and heated to satisfy the required pressure and the required temperature of the ME-GI engine, which is the propulsion engine of the LEG ship.
[(S2) 단계][(S2) step]
(S2) 단계는 재액화된 재액화 BOG를 ME-GI 엔진의 요구 압력인 500 ~ 700 bara로 가압하는 단계일 수 있으며, 바람직하게는, 600 bara로 가압할 수 있다. The step (S2) may be a step of pressurizing the reliquefied reliquefaction BOG to the required pressure of the ME-GI engine of 500 ~ 700 bara, preferably, may be pressurized to 600 bara.
고압 펌프에서 600bara로 가압된 재액화 BOG는 온도가 0℃인 액체상태일 수 있다.The reliquefaction BOG pressurized to 600 bara in a high pressure pump may be in a liquid state with a temperature of 0 ° C.
[(S3) 단계][(S3) step]
(S3) 단계는 (S2) 단계에서 가압된 재액화 BOG를 ME-GI 엔진의 요구 온도인 35 ~ 55 ℃로 가열하는 단계일 수 있으며, 바람직하게는 45 ℃로 가열할 수 있다.The step (S3) may be a step of heating the reliquefaction BOG pressurized in the step (S2) to the required temperature of the ME-GI engine, 35 ~ 55 ℃, preferably to 45 ℃.
LEG는 48.7 bara 및 32.2℃에서 초임계 상태가 되므로, 상기 (S3) 단계에서 가열된 재액화 BOG는 600 bara 및 45℃의 초임계 상태일 수 있다.Since the LEG is in a supercritical state at 48.7 bara and 32.2 ° C, the reliquefaction BOG heated in the step (S3) may be a supercritical state of 600 bara and 45 ° C.
한편, 본 발명은 LEG선의 재액화 시스템에서 재액화된 재액화 BOG를 500 ~ 700 bara로 가압하는 고압 펌프; 및 상기 고압 펌프에서 가압된 재액화 BOG를 35 ~ 55 ℃로 가열하는 히터를 포함하는, LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템에 관한 것일 수 있다.On the other hand, the present invention is a high-pressure pump for pressurizing the reliquefaction reliquefaction BOG 500 ~ 700 bara in the reliquefaction system of the LEG ship; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., and may be related to a fuel supply system for supplying fuel to a ME-GI engine for propulsion of an LEG vessel.
또한, 본 발명은 LEG선의 재액화 공정에서 재액화된 재액화 BOG를 500 ~ 700 bara 및 35 ~ 55 ℃로 가압 및 가열한 다음 ME-GI 엔진에 공급하는 것을 특징으로 하는, LEG선(LEG carrier)의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 방법에 관한 것일 수 있다.In addition, the present invention is characterized in that the reliquefaction of the re-liquefied BOG in the reliquefaction process of the LEG vessel is characterized in that the pressurized and heated to 500 ~ 700 bara and 35 ~ 55 ℃ and then supply to the ME-GI engine, LEG carrier (LEG carrier It may be related to a fuel supply method for supplying fuel to the propulsion ME-GI engine.
또한, 본 발명은 LEG선의 재액화 시스템에서 재액화된 재액화 BOG를 500 ~ 700 bara로 가압하는 고압 펌프; 및 상기 고압 펌프에서 가압된 재액화 BOG를 35 ~ 55 ℃로 가열하는 히터를 포함하되, -50℃ 이상에서 작동 가능한 장비로 구성된 것을 특징으로 하는 LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템에 관한 것일 수 있다.In addition, the present invention is a high pressure pump for pressurizing the reliquefaction reliquefaction BOG 500 ~ 700 bara in the reliquefaction system of the LEG ship; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., and supplying fuel to the ME-GI engine for propulsion of the LEG vessel, characterized in that it is configured to be operated at -50 ° C. or higher. It may be related to a fuel supply system for.
구체적으로, 상기 연료 공급 시스템에서, 제1 컴프레서 이후의 장비들은 -50℃ 이상의 장비들로 구성할 수 있으며, 특히, 고압 펌프 및 리시버와 같이 고가의 장비를 초저온용 장비가 아닌 -50℃ 이상의 장비를 사용할 수 있는 장점이 있다.Specifically, in the fuel supply system, the equipment after the first compressor may be composed of equipment of -50 ° C or more, and in particular, expensive equipment such as high pressure pumps and receivers may be equipment of -50 ° C or more rather than cryogenic equipment. There is an advantage that can be used.
본 발명에 의하면, LEG선에 설치되어 있는 재액화 시스템에 의해 재액화된 BOG를 ME-GI 엔진의 요구 압력 및 요구 온도로 만족시키기 위한 고압 펌프 및 히터만을 별도로 설치하면 되므로, BOG를 연료화하기 위하여 필요한 장비를 구비하기 위한 비용을 절감할 수 있다.According to the present invention, since only a high-pressure pump and a heater for satisfying the BOG liquefied by the reliquefaction system installed in the LEG ship at the required pressure and temperature of the ME-GI engine need to be separately installed, in order to fuel the BOG, The cost of having the necessary equipment can be reduced.
또한, LEG 저장탱크에서 발생하는 BOG를 이용하여, ME-GI 엔진의 연료로 공급하므로, BOG에 의해 LEG 저장탱크의 내부 압력이 과도하게 증가하는 것을 방지하여 LEG 저장탱크의 저장성을 향상시킬 수 있을 뿐만 아니라 BOG를 제거하기 위하여 별도로 소모되는 비용을 절감할 수 있다. In addition, since the BOG generated in the LEG storage tank is used to supply the fuel of the ME-GI engine, the internal storage pressure of the LEG storage tank can be prevented from being excessively increased by the BOG, thereby improving the storage performance of the LEG storage tank. In addition, the cost of eliminating the BOG can be reduced.
또한, -90℃의 온도로 저장탱크에 저장된 LEG를 ME-GI 엔진에 공급하기 위해서는 초저온용 장비를 사용하여야 하지만, 본 발명에 따른 연료 공급 시스템에서는 재액화 시스템에서 -50~-30℃의 온도로 재액화된 재액화 BOG를 가압 및 가열하므로, 초저온용 장비가 아닌 -50℃ 이상에서 작동하는 장비를 이용하여 연료 공급 시스템을 구성할 수 있다.In addition, in order to supply the LEG stored in the storage tank to the ME-GI engine at a temperature of -90 ° C, the cryogenic equipment should be used, but in the fuel supply system according to the present invention, the temperature of -50 to -30 ° C in the reliquefaction system Pressurized and heated to reliquefy the liquefied BOG, it is possible to configure the fuel supply system using equipment operating at -50 ℃ or more, not the cryogenic equipment.
이상과 같이 본 발명에 따른 연료 공급 시스템 및 연료 공급 방법을, 예시된 도면을 참조하여 설명하였으나, 본 발명은 이상에서 설명된 실시예와 도면에 의해 한정되지 않으며, 특허청구범위 내에서 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자들에 의해 다양한 수정 및 변형이 이루어질 수 있음은 물론이다.As described above, the fuel supply system and the fuel supply method according to the present invention have been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and the present invention is within the claims. Of course, various modifications and variations can be made by those skilled in the art.

Claims (24)

  1. LEG선(Liquefied Ethane Gas carrier)의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템으로서,As a fuel supply system for supplying fuel to the propulsion ME-GI engine of LEG (Liquefied Ethane Gas carrier),
    LEG 저장탱크에서 발생하는 BOG(Boil Off Gas)를 재액화시키는 재액화 시스템;A reliquefaction system for reliquefying BOG (Boil Off Gas) generated in the LEG storage tank;
    상기 재액화 시스템에서 재액화된 재액화 BOG를 가압하는 고압 펌프(HP booster pump); 및 An HP booster pump for pressurizing the reliquefied reliquefaction BOG in the reliquefaction system; And
    상기 고압 펌프에서 가압된 BOG를 가열하는 히터를 포함하는 연료 공급 시스템.And a heater for heating the pressurized BOG in the high pressure pump.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 재액화 시스템은 The reliquefaction system
    LEG 저장탱크에서 발생한 BOG를 압축시키는 컴프레서(compressor); 및A compressor for compressing the BOG generated in the LEG storage tank; And
    상기 컴프레서에서 압축된 BOG를 응축시키는 응축기(condenser)를 포함하는 것을 특징으로 하는 연료 공급 시스템. And a condenser for condensing the BOG compressed in the compressor.
  3. 청구항 2에 있어서,The method according to claim 2,
    상기 컴프레서는 제1 컴프레서, 제2 컴프레서 및 제3 컴프레서를 포함하는 3단 컴프레서인 것을 특징으로 하는 연료 공급 시스템.The compressor is a fuel supply system, characterized in that the three-stage compressor comprising a first compressor, a second compressor and a third compressor.
  4. 청구항 3에 있어서,The method according to claim 3,
    상기 제1 컴프레서의 전단에는 BOG로부터 액상 성분을 분리해내기 위한 녹아웃 드럼(Knock Out drum)이 설치된 것을 특징으로 하는 연료 공급 시스템.A front end of the first compressor is provided with a knock out drum (Knock Out drum) for separating the liquid component from the BOG.
  5. 청구항 3에 있어서,The method according to claim 3,
    상기 제1 컴프레서의 후단에는 제1 컴프레서에서 1차 압축된 BOG를 냉각시키기 위한 중간 냉각기(intermediate cooler)가 설치되고, 상기 제3 컴프레서의 후단에는 제3 컴프레서에서 3차 압축된 BOG를 냉각시키기 위한 후단 냉각기(after cooler)가 설치된 것을 특징으로 하는 연료 공급 시스템.An intermediate cooler is installed at the rear end of the first compressor to cool the BOG first compressed in the first compressor, and an intermediate cooler is installed at the rear end of the third compressor to cool the third compressed BOG in the third compressor. A fuel supply system, characterized in that an after cooler is installed.
  6. 청구항 1에 있어서,The method according to claim 1,
    상기 응축기는 냉매를 이용하여 가스를 응축시키는 냉각 사이클을 포함하는 것을 특징으로 하는 연료 공급 시스템. The condenser includes a refrigeration cycle for condensing the gas using the refrigerant.
  7. 청구항 1에 있어서,The method according to claim 1,
    상기 재액화 시스템은 상기 냉각기의 후단에 재액화된 BOG를 저장한 후, 고압 펌프로 이송하기 위한 리시버(Receiver)를 포함하는 것을 특징으로 하는 연료 공급 시스템. The reliquefaction system includes a receiver for storing the reliquefied BOG at the rear end of the cooler, and then transferring the reliquefaction system to a high pressure pump.
  8. 청구항 7에 있어서,The method according to claim 7,
    상기 리시버에 저장되며, 재액화 시스템에서 재액화된 BOG는 압력이 10 ~ 30 bara 이고, 온도가 -50 ~ -30 ℃인 것을 특징으로 하는 연료 공급 시스템. The fuel supply system, characterized in that stored in the receiver, the BOG reliquefied in the reliquefaction system has a pressure of 10 ~ 30 bara, the temperature is -50 ~ -30 ℃.
  9. 청구항 1에 있어서,The method according to claim 1,
    상기 고압 펌프는 재액화된 BOG를 ME-GI 엔진의 요구 압력인 500 ~ 700 bara로 가압하는 것을 특징으로 하는 연료 공급 시스템. The high pressure pump is a fuel supply system, characterized in that to pressurize the re-liquefied BOG to 500 ~ 700 bara, the required pressure of the ME-GI engine.
  10. 청구항 1에 있어서,The method according to claim 1,
    상기 히터는 고압 펌프에서 가압된 재액화된 BOG를 ME-GI 엔진의 요구 온도인 35 ~ 55 ℃로 가열하는 것을 특징으로 하는 연료 공급 시스템. The heater is a fuel supply system characterized in that for heating the re-liquefied BOG pressurized in the high pressure pump to the required temperature of 35 ~ 55 ℃ of the ME-GI engine.
  11. LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 방법으로서,As a fuel supply method for supplying fuel to a LEG ship's propulsion ME-GI engine,
    (S1) LEG 저장탱크에서 발생한 BOG를 재액화시키는 단계;(S1) reliquefying the BOG generated in the LEG storage tank;
    (S2) 상기 (S1) 단계에서 재액화된 재액화 BOG를 가압하는 단계; 및(S2) pressurizing the reliquefaction reliquefaction BOG in the step (S1); And
    (S3) 상기 (S2) 단계에서 가압된 재액화 BOG를 가열하는 단계를 포함하는 연료 공급 방법.(S3) a fuel supply method comprising the step of heating the reliquefaction BOG pressurized in the step (S2).
  12. 청구항 11에 있어서,The method according to claim 11,
    상기 (S1) 단계의 재액화는Reliquefaction of the step (S1)
    상기 LEG 저장탱크에서 발생한 BOG를 압축시키는 단계; 및Compressing the BOG generated in the LEG storage tank; And
    상기 압축된 BOG를 응축시키는 단계를 포함하는 재액화 방법에 BOG를 재액화시키는 것을 특징으로 하는 연료 공급 방법. Re-liquefying the BOG in a reliquefaction method comprising the step of condensing the compressed BOG.
  13. 청구항 12에 있어서,The method according to claim 12,
    상기 압축은 1차 압축, 2차 압축 및 3차 압축을 포함하는 3단 압축인 것을 특징으로 하는 연료 공급 방법.The compression is a fuel supply method characterized in that the three-stage compression including primary compression, secondary compression and tertiary compression.
  14. 청구항 13에 있어서,The method according to claim 13,
    상기 1차 압축은 BOG에 포함된 액상 성분을 분리해낸 후 1차 압축되는 것을 특징으로 하는 연료 공급 방법.The first compression is a fuel supply method characterized in that the first compression after separating the liquid component contained in the BOG.
  15. 청구항 13에 있어서,The method according to claim 13,
    상기 1차 압축된 BOG는 중간 냉각기에서 냉각된 후 2차 압축되고, 상기 3차 압축된 BOG는 후단 냉각기에서 냉각되는 것을 특징으로 하는 연료 공급 방법.And the first compressed BOG is cooled in an intermediate cooler and then second compressed, and the third compressed BOG is cooled in a subsequent cooler.
  16. 청구항 12에 있어서,The method according to claim 12,
    상기 응축은 냉매를 이용하는 냉각 사이클에 의해 가스를 응축시키는 것을 특징으로 하는 연료 공급 방법.And the condensation condenses the gas by a cooling cycle using a refrigerant.
  17. 청구항 12에 있어서,The method according to claim 12,
    상기 응축시키는 단계 후에, 재액화된 재액화 BOG를 저장하는 단계를 포함하는 것을 특징으로 하는 연료 공급 방법. After the condensing step, storing the reliquefied reliquefaction BOG.
  18. 청구항 17에 있어서,The method according to claim 17,
    상기 재액화 BOG는 압력이 10 ~ 30 bara 이고, 온도가 -50 ~ -30 ℃인 것을 특징으로 하는 연료 공급 방법. The reliquefaction BOG is a fuel supply method, characterized in that the pressure is 10 ~ 30 bara, the temperature is -50 ~ -30 ℃.
  19. 청구항 18에 있어서,The method according to claim 18,
    상기 재액화 BOG는 압력이 20 ~ 22 bara 이고, 온도가 -40 ℃인 것을 특징으로 하는 연료 공급 방법. The reliquefaction BOG is a fuel supply method, characterized in that the pressure is 20 ~ 22 bara, the temperature is -40 ℃.
  20. 청구항 11에 있어서,The method according to claim 11,
    상기 (S1) 단계는 재액화된 BOG를 ME-GI 엔진의 요구 압력인 500 ~ 700 bara로 가압하는 것을 특징으로 하는 연료 공급 방법. The step (S1) is a fuel supply method characterized in that for pressurizing the re-liquefied BOG to 500 ~ 700 bara, the required pressure of the ME-GI engine.
  21. 청구항 11에 있어서,The method according to claim 11,
    상기 (S2) 단계는 (S1) 단계에서 가압된 재액화된 재액화 BOG를 ME-GI 엔진의 요구 온도인 35 ~ 55 ℃로 가열하는 것을 특징으로 하는 연료 공급 방법. The step (S2) is a fuel supply method characterized in that for heating the reliquefied reliquefaction BOG pressurized in the step (S1) to the required temperature of 35 ~ 55 ℃ of the ME-GI engine.
  22. LEG선의 재액화 시스템에서 재액화된 재액화 BOG를 500 ~ 700 bara로 가압하는 고압 펌프; 및 상기 고압 펌프에서 가압된 재액화 BOG를 35 ~ 55 ℃로 가열하는 히터를 포함하는, LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템.A high pressure pump for pressurizing the reliquefaction reliquefaction BOG to 500 to 700 bara in the reliquefaction system of the LEG vessel; And a heater for heating the reliquefaction BOG pressurized by the high pressure pump to 35 to 55 ° C., a fuel supply system for supplying fuel to a LEG ship's propulsion ME-GI engine.
  23. LEG선의 재액화 공정에서 재액화된 재액화 BOG를 500 ~ 700 bara 및 35 ~ 55 ℃로 가압 및 가열한 다음 ME-GI 엔진에 공급하는 것을 특징으로 하는, LEG선(LEG carrier)의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 방법.MEG for propulsion of LEG carriers (LEG carriers), characterized in that the reliquefaction of reliquefaction BOG in the reliquefaction process of the LEG vessel is pressurized and heated to 500 ~ 700 bara and 35 ~ 55 ℃ and then supplied to the ME-GI engine -Fueling method for fueling the GI engine.
  24. LEG선의 재액화 시스템에서 재액화된 재액화 BOG를 500 ~ 700 bara로 가압하는 고압 펌프; 및 상기 고압 펌프에서 가압된 재액화 BOG를 35 ~ 55 ℃로 가열하는 히터를 포함하되, -50℃ 이상에서 작동 가능한 장비를 포함하는 것을 특징으로 하는 LEG선의 추진용 ME-GI 엔진에 연료를 공급하기 위한 연료 공급 시스템.A high pressure pump for pressurizing the reliquefaction reliquefaction BOG to 500 to 700 bara in the reliquefaction system of the LEG vessel; And a heater for heating the reliquefaction BOG pressurized by the high-pressure pump to 35 to 55 ° C., and supplying fuel to the ME-GI engine for propulsion of the LEG vessel, comprising equipment operable at -50 ° C. or more. Fuel supply system.
PCT/KR2015/004545 2014-05-07 2015-05-07 Fuel supply system and fuel supply method of leg carrier WO2015170889A1 (en)

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