KR100441857B1 - Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier - Google Patents

Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier Download PDF

Info

Publication number
KR100441857B1
KR100441857B1 KR10-2002-0013772A KR20020013772A KR100441857B1 KR 100441857 B1 KR100441857 B1 KR 100441857B1 KR 20020013772 A KR20020013772 A KR 20020013772A KR 100441857 B1 KR100441857 B1 KR 100441857B1
Authority
KR
South Korea
Prior art keywords
gas
boil
storage tank
temperature
pressure
Prior art date
Application number
KR10-2002-0013772A
Other languages
Korean (ko)
Other versions
KR20030073974A (en
Inventor
배재욱
박성도
이정희
김은석
박봉운
Original Assignee
대우조선해양 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR10-2002-0013772A priority Critical patent/KR100441857B1/en
Publication of KR20030073974A publication Critical patent/KR20030073974A/en
Application granted granted Critical
Publication of KR100441857B1 publication Critical patent/KR100441857B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
    • C10G5/06—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas by cooling or compressing
    • 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
    • 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
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—Nitrogen
    • 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
    • F25J1/0243—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
    • F25J1/0262—Details of the cold heat exchange system
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
    • 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
    • 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
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/90—Mixing of components
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/34—Details about subcooling of liquids

Abstract

본 발명은 극저온의 상태로 액화된 LNG를 저장 및 운송하는 LNG 운반선의 저장탱크 내에서 외부의 열로 인해 기화되어 발생하는 증발가스의 재액화 방법에 관한 것이다.The present invention relates to a method for reliquefaction of boil-off gas generated by vaporization due to external heat in a storage tank of an LNG carrier that stores and transports LNG liquefied at a cryogenic state.

본 발명은 극저온의 LNG가 저장되어 외부에서 전달되는 열로 인해 기화된 증발가스가 발생하는 저장탱크에 있어서, 저장 탱크(10)에 연결되어 증발가스의 온도를 1차 냉각시키는 스프레이 냉각기(20), 상기 스프레이 냉각기(20)에 연결되어 1차 냉각된 증발가스를 가압 시키는 재액화 압축기(30), 상기 재액화 압축기(30)에 연결되어 가압된 증발 가스를 액화시키는 증발가스 응축기(40), 상기 증발가스 응축기(40)에 연결되어 액화된 증발가스의 일부를 상기 스프레이 냉각기(20)로 이송시키는제 2 밸브(110), 상기 증발가스 응축기(40)에 연결된 제 1 밸브(100)를 통해 이송된 액화 증발가스를 상기 저장탱크(10)에 저장된 극저온의 LNG와 혼합하여 냉각하는 재 혼합기(120), 상기 재 혼합기(120)에 연결되어 액화 증발가스를 상기 저장탱크(10)에 저장하는 재액 회수 라인(130), 상기 저장탱크(10)의 하부에 장착되어 저장되어 있는 LNG를 제 3 밸브(150)를 통해 상기 재혼합기(120)로 이송시키는 스트립 스프레이 펌프(140)로 구성되는 것을 특징으로 한다.According to the present invention, in a storage tank in which cryogenic LNG is stored and vaporized evaporated gas is generated due to heat transferred from the outside, the spray cooler 20 is connected to the storage tank 10 to cool the temperature of the boiled gas first, A reliquefaction compressor 30 connected to the spray cooler 20 to pressurize the first cooled evaporation gas, an evaporation gas condenser 40 connected to the reliquefaction compressor 30 to liquefy the pressurized evaporated gas, and A second valve 110 connected to the boil-off condenser 40 to transfer a portion of the liquefied boil-off gas to the spray cooler 20 and a first valve 100 connected to the boil-off gas condenser 40. A re-mixer 120 for mixing and cooling the liquefied liquefied evaporated gas with the cryogenic LNG stored in the storage tank 10 and a re-liquid connected to the re-mixer 120 to store the liquefied evaporated gas in the storage tank 10. Recovery line (130 ), A strip spray pump 140 for transporting the LNG stored in the lower portion of the storage tank 10 to the remixer 120 through the third valve 150.

Description

엘앤지 운반선의 증발가스 재액화 방법 및 시스템 장치{Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier}Boil off gas liquefaction method and system assembly of Liquefied natural gas carrier

본 발명은 천연 가스 운반선의 운항 중 외부에서 전달되는 열량으로 인해 저장 탱크에서 발생되는 증발가스(BOG, Boil Off Gas)의 재액화 시스템에 관한 것으로서, 보다 상세하게는, 액화 천연가스의 운송 중 저장탱크에서 발생되는 증발가스를 증발가스 재액화 시스템과 질소 냉각 시스템을 이용하여 전량 재 액화하여 저장 탱크에 회수시킴으로써 소모되는 증발가스의 양을 제거하고 선박의 주 엔진을 액화 천연 가스를 사용하는 보일러에서 선박유를 사용하는 내연기관으로 교체함으로써 선박 운항비를 감소시킬 수 있는 천연 가스 운반선의 증발가스 재액화 시스템에 관한 것이다.The present invention relates to a reliquefaction system of boil off gas (BOG) generated from a storage tank due to the amount of heat transferred from the outside during operation of a natural gas carrier, and more particularly, storage of liquefied natural gas during transportation. The evaporated gas generated in the tank is liquefied and recovered in the storage tank by using the evaporated gas reliquefaction system and the nitrogen cooling system to remove the amount of evaporated gas consumed, and the main engine of the vessel is a boiler using liquefied natural gas. The present invention relates to a boil-off gas reliquefaction system of a natural gas carrier that can reduce the cost of operating a ship by replacing it with an internal combustion engine using ship oil.

일반적으로, 천연가스 운반선(이하 LNG 운반선이라 칭함.)은 기체 상태의 천연가스(Natural Gas)를 -163 ℃로 액화시킨 액화 천연가스(LNG, Liquefied Natural Gas, 이하 LNG라 칭함.)를 저장하여 운송하는 선박이다.Generally, natural gas carriers (hereinafter referred to as LNG carriers) store liquefied natural gas (LNG, Liquefied Natural Gas, hereinafter referred to as LNG) by liquefying gaseous natural gas at -163 ° C. It is a ship to transport.

상기 LNG 운반선의 저장탱크는 극 저온에서도 강성을 유지해야 하는 특성 때문에 알루미늄으로만 제작된다.The storage tank of the LNG carrier is made of aluminum only because of the property of maintaining rigidity even at extremely low temperatures.

상기 LNG 운반선의 저장탱크 형성방식은 구형 독립 탱크 방식과 멤브레인 식(일명 다이아 프램식) 두 가지가 많이 쓰이는데, 개발자의 이름을 따서 구형 독립 탱크 방식은 모스식(Moss)이라 하고, 멤브레인 식은 테크니가스 식(Technigas)과 가스 트랜스 포트식(Gas Transport)으로 불린다.There are two types of storage tank formation methods of the LNG carrier, a spherical independent tank type and a membrane type (aka diaphragm type), and a spherical independent tank type is named Moss after the developer's name, and the membrane type is Technigas. It's called Technigas and Gas Transport.

상기 구형 독립 탱크 방식은 선박을 먼저 건조시킨 후에 알루미늄으로 직경 40 m나 되는 볼형태의 탱크를 제작하여 중간 높이의 허리 부분을 지지하여 선박에 고정시키는 방법으로서, 보강재를 사용하지 않으므로 용접량이 최소화되고 제작시 또는 사용시 응력 집중점이 적은 장점을 가지고 있다.The spherical independent tank method is a method of manufacturing a ball-shaped tank having a diameter of 40 m and then fixing it to the ship by making a ball-shaped tank having a diameter of 40 m with aluminum. It has the advantage of low stress concentration point in manufacturing or use.

그러나, 선박의 지상고가 높아져 선박 운항시 바람을 많이 받으므로 조타 장치와 계선 계류 장치를 강화시켜야 하는 단점을 가지고 있다.However, since the ground height of the vessel is increased and receives a lot of wind during the operation of the vessel, the steering and mooring mooring device has to be strengthened.

상기 멤브레인 방식은 별도의 탱크를 제작하지 않고 선박의 화물창 내벽에 보온을 잘하고, 상기 보온 표면을 얇은 금속판으로 밀폐시킨 방식으로, 선체가 최적화 사이즈로 작아지고 특수 설비의 장착이 불필요하다는 장점이 있는 반면에 제작시 또는 사용시 응력 집중점이 많고 선체 외부의 충돌시 좌초 등과 같은 손상요인을 피해야 하는 단점을 가지고 있다.The membrane method is a good way to keep warm on the inner wall of the cargo hold of the ship without making a separate tank, and the heat insulating surface is sealed with a thin metal plate, while the hull is reduced to an optimized size and the installation of special equipment is unnecessary It has the disadvantages that many stress concentration points are used during fabrication or use, and damage factors such as stranding in case of collision outside the hull are to be avoided.

상기 멤브레인 방식의 테크니가스 식과 가스 트랜스 포트식의 차이는 보온재의 구성과 시공 방법에 있다.The difference between the membrane type technigas formula and the gas transport formula lies in the construction and construction method of the insulation.

상기 LNG 운반선은 운항 중 태양의 직사 광과 같은 외부 열이 저장탱크에 전달되는데, 이 때, 상기 저장탱크 내에서는 LNG의 일부가 기화되는 증발가스가 발생된다.In the LNG carrier, external heat, such as direct sunlight from the sun, is transmitted to the storage tank during operation, and at this time, an evaporation gas is generated in which the LNG is partially vaporized in the storage tank.

상기 저장탱크 내에서 기화되는 증발가스의 증발량은 겨울철과 여름철에 따라 다르지만 평균적으로 1일에 전체 저장된 가스량의 0.15%정도 발생된다.The amount of evaporated gas evaporated in the storage tank varies depending on winter and summer, but on average, about 0.15% of the total amount of stored gas is generated in one day.

상기 증발가스는 설정해 놓은 안전 압력(0.25 bar)이상이 되면 안전 밸브를 통해 배출되는데, 기존 LNG 운반선 에서는 액화 천연가스 증발량의 전량을 선박의보일러와 운항을 위한 연료로 사용함으로써 가스 저장탱크의 압력이 안정되게 유지된다.The boil-off gas is discharged through the safety valve when the safety pressure (0.25 bar) or more is set. In the existing LNG carrier, the total pressure of the liquefied natural gas evaporation is used as the fuel for the boiler and the operation of the gas storage tank. It remains stable.

그러나, 선박의 추진 연료로 LNG와 선박유(Heavy Fuel Oil)를 비교했을 때 상기 LNG의 가격이 고가이므로 선박의 운항비가 크게 소모되는 문제점을 가지고 있다.However, when comparing LNG and heavy fuel oil as a propulsion fuel of a ship, since the price of the LNG is high, the operating cost of the ship is greatly consumed.

상술한 바와 같은 문제점을 해결하기 위하여 안출돤 본 발명의 목적은 LNG 선박의 운항 중에 저장탱크에서 발생하는 LNG의 증발가스를 재액화시킨 후 저장탱크로 회수시킴으로써 LNG의 운송중 발생하는 손실량을 제거하고, 선박의 주 엔진 연료를 선박유로 변경시킴으로써 연료의 단가와 연료 소비량을 감소시켜 선박 운항비를 감소시키고자 하는데 있다.In order to solve the problems described above, the object of the present invention is to re-liquefy the evaporated gas of LNG generated in the storage tank during the operation of the LNG vessel to recover the storage tank by removing the amount of loss generated during transportation of LNG In order to reduce the operating cost of the ship, the main engine fuel of the ship is changed to the ship oil.

전술한 바와 같은 본 발명의 목적을 달성하기 위해서, 증발가스를 스프레이 쿨러와 재액화 2단 압축기가 사용하여 1차로 냉각 및 압축시키고 질소 냉각 시스템이 장착된 증발가스 응축기와 재 혼합기 및 재생액 회수 라인과 스트립 스프레이 펌프를 이용하여 기체 상태의 증발가스를 재액화하여 액화된 증발가스를 저장탱크에 저장시키는 LNG 운반선의 증발가스 재액화 시스템를 제공한다.In order to achieve the object of the present invention as described above, an evaporative gas condenser, a remixer and a regeneration liquid recovery line equipped with a nitrogen cooling system are used to cool and compress the evaporated gas primarily by using a spray cooler and a reliquefaction two-stage compressor. The present invention provides an LNG carrier liquefaction system for storing liquefied vaporized gas in a storage tank by reliquefying gaseous vaporized gas using a strip spray pump.

도 1은 본 발명의 일실시예에 의한 LNG 운반선의 증발가스 재액화 시스템 장치를 도시하는 배관도.1 is a piping diagram showing a boil-off gas reliquefaction system apparatus of the LNG carrier according to an embodiment of the present invention.

도 2는 본 발명의 일실시예에 의한 LNG 운반선의 증발가스 재액화 방법의 순서를 도시하는 순서도.2 is a flow chart showing a procedure of the method for re-liquefying the boil-off gas of the LNG carrier according to an embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 저장 탱크 20 : 스프레이 냉각기10: storage tank 20: spray cooler

30 : 재액화 압축기 40 : 증발가스 응축기30: reliquefaction compressor 40: boil off gas condenser

50 : 질소 열 교환기 60 : 제 1 압축기50: nitrogen heat exchanger 60: first compressor

62 : 제 2 압축기 66 : 제 3 압축기62: second compressor 66: third compressor

70 : 전동기 80 : 제 1 중간 냉각기70: electric motor 80: first intermediate cooler

82 : 제 2 중간 냉각기 84 : 제 3 중간 냉각기82: second intermediate cooler 84: third intermediate cooler

90 : 팽창 터빈 100 : 제 1 밸브90 expansion turbine 100 first valve

110 : 제 2 밸브 120 : 재 혼합기110: second valve 120: remixer

130 : 재액 회수 라인 140 : 스트립 스프레이 펌프130: liquid recovery line 140: strip spray pump

150 : 제 3 밸브150: third valve

이하 첨부한 도면을 참조하여 본 발명의 일실시예에 의한 LNG 운반선의 증발가스 재액화 시스템에 관해서 상세히 설명한다.Hereinafter, a boil-off gas reliquefaction system of an LNG carrier according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일실시예에 의한 LNG 운반선의 증발가스 재액화 시스템 장칠를 도시하는 배관도이고, 도 2는 본 발명의 일실시예에 의한 LNG 운반선의 증발가스 재액화 방법의 순서를 도시하는 순서도이다.1 is a piping diagram showing the evaporation gas re-liquefaction system of the LNG carrier according to an embodiment of the present invention, Figure 2 is a flow chart showing the procedure of the method for re-liquefied boil-off gas of the LNG carrier according to an embodiment of the present invention. Flowchart.

상기 도면에 도시하였듯이, 극저온의 상태로 액화되어 저장 및 운송되는 LNG는 선박의 운항 중 태양의 직사광과 같은 외부의 열로 인해 저장탱크(10)내에서 기화되고, 상기 저장 탱크(10)내에서 기화되는 증발가스는 설정해 놓은 안전 압력(0.25 bar) 이상이 되면 안전 밸브가 작동되어 배출된다.(ST 10)As shown in the figure, LNG liquefied, stored and transported in a cryogenic state is vaporized in the storage tank 10 due to external heat such as direct sunlight of the sun during the operation of the vessel, and vaporized in the storage tank 10. When the evaporated gas becomes higher than the set safety pressure (0.25 bar), the safety valve is operated and discharged. (ST 10)

상기 안전 밸브를 통해 배출되는 증발가스의 온도는 약 -140 ℃이다.The temperature of the boil-off gas discharged through the safety valve is about -140 ° C.

상기 안전 밸브를 통해 배출되는 고온 저압의 증발가스는 극저온으로 액화된 증발가스가 분사되는 스프레이 냉각기(20)를 관통하면서 1차로 온도가 냉각된다.(ST 20)The high temperature low pressure evaporated gas discharged through the safety valve is first cooled by passing through the spray cooler 20 into which the evaporated gas liquefied to cryogenic temperature is injected. (ST 20)

상기 스프레이 냉각기(20)를 관통함으로써 1차로 온도가 냉각된 기체 상태의 증발가스는 두 개의 재액화 압축기(30)를 지나가면서 압력이 약 6 bar까지 증가된다.(ST 30)By passing through the spray cooler 20, the vaporized gaseous gas of which the temperature is first cooled is passed through two reliquefaction compressors 30, and the pressure is increased to about 6 bar. (ST 30)

상기 재액화 압축기(30)를 관통한 저온 고압의 증발 가스는 질소 냉각 시스템이 부착된 증발가스 응축기(40)를 관통하면서 저온 저압의 액체 상태로 액화된다.The low temperature high pressure evaporated gas passing through the reliquefaction compressor 30 is liquefied into a low temperature low pressure liquid state while passing through the evaporative gas condenser 40 to which the nitrogen cooling system is attached.

상기 증발가스 응축기(40)에서의 증발가스의 흐름을 설명하면, 상기 재액화 압축기(30)를 관통한 저온 고압의 증발가스는 고압의 질소 가스를 사용하는 질소 열 교환기(50)로 이송되어 2차로 온도가 냉각된다.(ST 40)Referring to the flow of the boil-off gas in the boil-off gas condenser 40, the low-temperature, high-pressure boil-off gas passing through the reliquefaction compressor 30 is transferred to the nitrogen heat exchanger 50 using the high-pressure nitrogen gas 2 The temperature is cooled by car (ST 40).

상기 질소 열 교환기(50)를 통과함으로써 2차로 냉각된 증발가스가 세 개의제 1, 제 2, 제 3 압축기(60)(62)(64)와 세 개의 제 1, 제 2, 제 3 중간 냉각기(80)(82)(84)를 순서대로 통과함으로써 온도는 더욱더 하강되고 압력은 증가된다.(ST 50)(ST 60)(ST 70)(ST 80)(ST 90)(ST 100)By passing through the nitrogen heat exchanger (50), the boil-off gas which is secondarily cooled is divided into three first, second and third compressors (60), 62 and 64 and three first, second and third intermediate coolers. By passing through (80) (82) (84) in order, the temperature is further lowered and the pressure is increased. (ST 50) (ST 60) (ST 70) (ST 80) (ST 90) (ST 100)

상기 3단 압축기와 3단 중간 냉각기를 차례대로 통과한 저온 고압의 증발가스는 다시 한 번 질소 열 교환기(50)로 이송되어 온도가 냉각된다.(ST 110)The low-temperature, high-pressure evaporative gas that passes through the three-stage compressor and the three-stage intermediate cooler in turn is transferred to the nitrogen heat exchanger 50 to cool the temperature. (ST 110)

상기 질소 열 교환기(50)를 통과한 저온 고압의 증발 가스는 팽창 터빈(90)을 관통함으로써 저온 저압이 되어 기체에서 액체로 상변화가 발생된다.(ST 120)The low-temperature, high-pressure evaporative gas passing through the nitrogen heat exchanger 50 passes through the expansion turbine 90 to become low-temperature low-pressure, thereby causing a phase change from gas to liquid.

상기 팽창 터빈(90)과 세 개의 압축기(60)(62)(64)는 전동기(70)를 이용하여 구동된다.The expansion turbine 90 and three compressors 60, 62, 64 are driven using an electric motor 70.

상기 증발가스 응축기(40)를 관통함으로써 액화된 증발가스의 일부는 제 2 밸브(110)를 통해 상기 스프레이 냉각기(20)로 이송되고 나머지는 제 1 밸브(100)를 통하여 재 혼합기(120)로 이송된다.(ST 140)A portion of the boil-off gas liquefied by passing through the boil-off gas condenser 40 is transferred to the spray cooler 20 through the second valve 110 and the rest to the remixer 120 through the first valve 100. (ST 140)

상기 스프레이 냉각기(20)로 이송된 증발가스는 상기 저장 탱크(10)에서 안전 밸브를 통해 배출되는 고온 저압의 증발가스의 온도를 1차로 냉각시키기 위해 분사된다.(ST 130)The boil-off gas transferred to the spray cooler 20 is injected to cool the temperature of the high-temperature low-pressure boil-off gas discharged through the safety valve from the storage tank 10 firstly. (ST 130)

상기 재 혼합기(120)에서 액화 증발가스가 저장탱크(10)에 저장되어 있는 극저온의 LNG와 혼합되어 -163 ℃까지 냉각된다.(ST 150)In the remixer 120, the liquefied boil-off gas is mixed with the cryogenic LNG stored in the storage tank 10 and cooled to -163 ° C. (ST 150)

상기 재 혼합기(120)를 관통한 액화 증발가스는 재액 회수 라인(130)을 통해서 상기 저장탱크(10)의 하부측에 분사된다.(ST 160)The liquefied boil-off gas passing through the remixer 120 is injected to the lower side of the storage tank 10 through the re-liquid recovery line 130. (ST 160)

상기 저장탱크(10)의 하부에는 스트립 스프레이 펌프(140)가 장착되어 저장탱크(10)에 저장되어 있는 LNG를 제 3 밸브(150)를 통해 상기 재혼합기(120)로 이송시키고, 이송된 상기 LNG는 재 혼합기(120)에 인입되는 액화 증발가스와 혼합된다.The strip spray pump 140 is mounted on the lower portion of the storage tank 10 to transfer LNG stored in the storage tank 10 to the remixer 120 through the third valve 150. The LNG is mixed with the liquefied boil-off gas introduced into the remixer 120.

상기와 같은 구성으로 이루어지는 본 발명은 LNG선의 운항 중 저장된 LNG의 손실이 없으며, 주엔진이 증발가스를 사용하는 보일러에서 선박유를 사용하는 디젤 타입으로 교체되므로 선박 운항비가 감소되는 효과를 갖는다.According to the present invention having the above configuration, there is no loss of stored LNG during the operation of the LNG carrier, and since the main engine is replaced with a diesel type using marine oil in the boiler using the boil-off gas, the operation cost of the vessel is reduced.

Claims (3)

극저온의 상태로 액화된 LNG를 저장 및 운송하는 LNG 운반선의 저장탱크 내에서 외부의 열로 인해 기화되어 발생되는 증발가스의 처리 방법에 있어서, 저장 탱크(10)내에서 기화되는 증발가스는 설정해 놓은 안전 압력(0.25 bar) 이상이 되면 안전 밸브가 작동되어 배출되는 단계(ST 10), 상기 안전 밸브를 통해 배출되는 고온 저압의 증발가스가 스프레이 냉각기(20)를 관통하면서 1차로 온도가 감소되는 단계(ST 20), 상기 스프레이 냉각기(20)를 관통한 증발가스가 두 개의 재액화 압축기(30)를 지나가면서 압력이 증가되는 단계(ST 30), 상기 재액화 압축기(30)를 관통한 저온 고압의 증발 가스가 고압의 질소 가스를 사용하는 질소 열 교환기(50)로 이송되어 2차로 온도가 하강되는 단계(ST 40), 상기 질소 열 교환기(50)를 통과한 증발가스가 세 개의 제 1, 제 2, 제 3 압축기(60)(62)(64)와 세 개의 제 1, 제 2, 제 3 중간 냉각기(80)(82)(84)를 순서대로 통과함으로써 온도는 더욱더 하강되고 압력은 증가되는 단계(ST 50)(ST 60)(ST 70)(ST 80)(ST 90)(ST 100), 상기 3단 압축기와 3단 중간 냉각기를 차례대로 통과한 저온 고압의 증발가스가 다시 한 번 온도를 낮추기 위해 상기 질소 열 교환기(50)로 이송되는 단계(ST 110), 상기 질소 열 교환기(50)를 통과한 저온 고압의 증발 가스가 팽창 터빈(90)을 관통함으로써 저온 저압이 되어 기체에서 액체로 상변화가 발생되는 단계(ST 120), 상기 증발가스 응축기(40)를 관통한 액화 증발가스의 일부가 제 2 밸브(110)를 통해 상기 스프레이 냉각기(20)로 이송되어 저장 탱크(10)의 안전 밸브를 통해 배출되는 고온 저압의 증발가스를 냉각시키고(ST 130) 나머지는 제 1 밸브(100)를 통하여 재 혼합기(120)로 이송되는 단계(ST 140), 상기 재 혼합기(120)에서 액화 증발가스가 저장탱크(10)에 저장되어 있는 극저온의 LNG와 혼합되는 단계(ST 150), 상기 재 혼합기(120)를 관통한 액화 증발가스가 재액 회수 라인(130)을 통해서 상기 저장탱크(10)의 하부측에 분사되는 단계(ST 160)로 구성되는 것을 특징으로 하는 LNG 운반선의 증발가스 재액화 방법.In the method for treating boil-off gas generated by vaporization due to external heat in a storage tank of an LNG carrier that stores and transports LNG liquefied at a cryogenic state, the boil-off gas vaporized in the storage tank 10 has been set to safety. When the pressure (0.25 bar) or more is the step of operating the safety valve is discharged (ST 10), the step of reducing the temperature of the first temperature while the high-temperature low-pressure evaporated gas discharged through the safety valve passes through the spray cooler 20 ( ST 20), the step of increasing the pressure as the boil-off gas passing through the spray cooler 20 passes through the two reliquefaction compressors (ST 30), and the low temperature and high pressure through the reliquefaction compressor 30 The boil-off gas is transferred to the nitrogen heat exchanger 50 using the nitrogen gas at high pressure, and the temperature is lowered secondly (ST 40). 2, the third compressor (60) (62) (64) and three first, second and third intermediate coolers 80, 82 and 84 in order to pass temperature further down and pressure increase (ST 50) (ST 60) (ST 70) (ST 80) (ST 90) (ST 100), the low-temperature and high-pressure evaporative gas passed through the three-stage compressor and the three-stage intermediate cooler in order to lower the temperature once again to reduce the temperature In the step (ST 110) transferred to the heat exchanger (50), the low-temperature, high-pressure evaporative gas passing through the nitrogen heat exchanger (50) passes through the expansion turbine (90) to become low-temperature low-pressure, thereby causing a phase change from gas to liquid. In step ST 120, a part of the liquefied boil-off gas passing through the boil-off gas condenser 40 is transferred to the spray cooler 20 through the second valve 110 and through the safety valve of the storage tank 10. Cooling the discharged high-temperature low-pressure evaporated gas (ST 130) and the rest is transferred to the re-mixer 120 through the first valve 100 (ST 140), the liquefied boil-off gas is mixed with the cryogenic LNG stored in the storage tank 10 in the remixer 120 (ST 150), the liquefied boil-off gas passed through the remixer 120 is recovered Boiler gas reliquefaction method of the LNG carrier characterized in that it comprises a step (ST 160) is injected into the lower side of the storage tank (10) through the line (130). 극저온의 LNG가 저장되는 LNG 운반선의 저장탱크 내에서 외부의 열로 인해 기화되어 발생하는 증발가스의 재액화 방법에 있어서, 극저온으로 저장된 LNG가 기화되는 증발가스가 발생 및 배출되는 저장탱크(10), 상기 저장 탱크(10)에 연결되어 배출된 증발가스의 온도를 1차로 감소시키는 스프레이 냉각기(20), 상기 스프레이 냉각기(20)에 연결되어 1차 냉각된 증발가스의 압력을 증가시키는 재액화 압축기(30), 상기 재액화 압축기(30)에 연결되어 고압의 증발 가스를 액체 상태로 액화시키는 증발가스 응축기(40), 상기 증발가스 응축기(40)에 연결되어 액화된 증발가스의 일부를 상기 스프레이 냉각기(20)로 이송시키는 제 2 밸브(110), 상기 증발가스 응축기(40)에 연결된 제 1 밸브(100)를 통해 이송된 액화 증발가스를 상기 저장탱크(10)에 저장된 극저온의 LNG와 혼합하여 냉각하는 재 혼합기(120), 상기 재 혼합기(120)에 연결되어 액화 증발가스를 상기 저장탱크(10)의 하부측에 분사하는 재액 회수 라인(130), 상기 저장탱크(10)의 하부에 장착되어 저장되어 있는 LNG를 제 3 밸브(150)를 통해 상기 재혼합기(120)로 이송시키는 스트립 스프레이 펌프(140)로 구성되는 것을 특징으로 하는 LNG 운반선의 증발가스 재액화 시스템 장치.In the method of reliquefaction of the boil-off gas generated by vaporization due to external heat in the storage tank of the LNG carrier in which the cryogenic LNG is stored, the storage tank (10) for generating and discharge the boil-off gas vaporized by the LNG stored at cryogenic temperature, A spray cooler 20 connected to the storage tank 10 to reduce the temperature of the discharged boil-off gas first, and a reliquefaction compressor connected to the spray cooler 20 to increase the pressure of the first cooled boil-off gas ( 30), an evaporation gas condenser 40 connected to the reliquefaction compressor 30 to liquefy the high-pressure evaporation gas in a liquid state, and a portion of the evaporated gas liquefied connected to the evaporation gas condenser 40 to the spray cooler The liquefied boil-off gas transferred through the second valve 110 and the first valve 100 connected to the boil-off condenser 40 is mixed with the cryogenic LNG stored in the storage tank 10. Re-mixer 120 for cooling, the re-liquid recovery line 130 is connected to the re-mixer 120 to inject the liquefied evaporated gas to the lower side of the storage tank 10, the lower portion of the storage tank 10 Evaporation gas re-liquefaction system apparatus of the LNG carrier, characterized in that consisting of a strip spray pump 140 for transporting the LNG stored in the installation via the third valve (150) to the remixer (120). 상기 제 2항에 있어서, 상기 증발가스 응축기(40)는 상기 재액화 압축기(30)에 연결되어 고압의 질소 가스를 사용하여 증발가스의 온도를 2차로 하강시키는 질소 열 교환기(50), 상기 질소 열 교환기(50)에 연결되어 온도가 냉각된 증발가스의 압력을 증가시키는 제 1 압축기(60), 상기 제 1 압축기(60)에 연결되어 압력이 증가된 증발가스의 온도를 냉각시키는 제 1 중간 냉각기(80), 상기 제 1 중간 냉각기(80)에 연결된 제 2 압축기(62), 상기 제 2 압축기(62)에 연결된 제 2 중간 냉각기(82), 상기 제 2 중간 냉각기(82)에 연결되는 제 3 압축기(64), 상기 제 3 압축기(64)에 연결되는 제 3 중간 냉각기(84), 상기 질소 열 교환기(50)연결되어 증발 가스가 기체에서 액체로 상변화 되는 팽창 터빈(90), 상기 팽창 터빈(90)과 제 1, 제 2 , 제 3 압축기(60)(62)(64)를 구동시키는 전동기(70)로 구성되는 것을 특징으로 하는 LNG 운반선의 증발가스 재액화 시스템 장치.The nitrogen heat exchanger (50) of claim 2, wherein the boil-off gas condenser (40) is connected to the reliquefaction compressor (30) to lower the temperature of the boil-off gas by using nitrogen gas at a high pressure. A first compressor (60) connected to the heat exchanger (50) to increase the pressure of the cooled boil-off gas, and a first intermediate (60) connected to the first compressor (60) to cool the temperature of the boiled gas to which the pressure is increased; A cooler 80, a second compressor 62 connected to the first intermediate cooler 80, a second intermediate cooler 82 connected to the second compressor 62, and a second intermediate cooler 82 connected to the second intermediate cooler 82. A third compressor (64), a third intermediate cooler (84) connected to the third compressor (64), an expansion turbine (90) connected to the nitrogen heat exchanger (50) so that the boil-off gas changes from gas to liquid, With the electric motor 70 to drive the expansion turbine 90 and the first, second, third compressors 60, 62, 64 Boil-off gas re-liquefaction apparatus system of an LNG carrier, characterized in that the sex.
KR10-2002-0013772A 2002-03-14 2002-03-14 Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier KR100441857B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR10-2002-0013772A KR100441857B1 (en) 2002-03-14 2002-03-14 Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR10-2002-0013772A KR100441857B1 (en) 2002-03-14 2002-03-14 Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier

Publications (2)

Publication Number Publication Date
KR20030073974A KR20030073974A (en) 2003-09-19
KR100441857B1 true KR100441857B1 (en) 2004-07-27

Family

ID=32224758

Family Applications (1)

Application Number Title Priority Date Filing Date
KR10-2002-0013772A KR100441857B1 (en) 2002-03-14 2002-03-14 Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier

Country Status (1)

Country Link
KR (1) KR100441857B1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100777136B1 (en) 2005-07-19 2007-11-28 신영중공업주식회사 Boil off gas reliquefaction apparatus using line mixer
WO2009011497A3 (en) * 2007-07-19 2009-03-19 Daewoo Shipbuilding & Marine Fuel gas supply system and method of ship
KR100891958B1 (en) * 2007-05-08 2009-04-08 대우조선해양 주식회사 System and method for supplying fuel gas in ships
US7841288B2 (en) 2008-02-11 2010-11-30 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Storage tank containing liquefied natural gas with butane
US8028724B2 (en) 2007-02-12 2011-10-04 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and unloading of LNG from the tank
KR101092388B1 (en) 2011-05-27 2011-12-09 서울대학교산학협력단 System and method for storing cryogenic fluids
US9086188B2 (en) 2008-04-10 2015-07-21 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Method and system for reducing heating value of natural gas
WO2023136731A1 (en) * 2022-01-12 2023-07-20 Gba Marine As Device for reintroducing vapour into a volatile liquid

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100681319B1 (en) * 2006-01-05 2007-02-15 신영중공업주식회사 Bog reliquefaction apparatus
EP1913117A1 (en) * 2005-07-19 2008-04-23 Shinyoung Heavy Industries Co., Ltd. Lng bog reliquefaction apparatus
KR100740686B1 (en) * 2005-08-26 2007-07-18 신영중공업주식회사 Bog reliquefaction apparatus
KR100699163B1 (en) * 2005-11-17 2007-03-23 신영중공업주식회사 Reliquefaction apparatus of lng bog and reliquefaction method
KR100681557B1 (en) * 2005-12-01 2007-02-09 대우조선해양 주식회사 Boil off gas reliquefaction treatment system of liquefied natural gas carrier
KR100726290B1 (en) * 2005-12-29 2007-06-11 삼성중공업 주식회사 Process and apparatus for recycling of boil off gas
NO325976B1 (en) * 2006-01-26 2008-08-25 Gba Marine As Apparatus for absorption of gas or vapor in liquid and method of reintroducing vapor or gas in liquid from which the gas or vapor originates
KR100758395B1 (en) * 2006-02-14 2007-09-14 대우조선해양 주식회사 Pre-cooler for reliquefaction system of LNG carrier
KR100674163B1 (en) * 2006-03-02 2007-01-29 신영중공업주식회사 Bog reliquefaction apparatus
KR100761976B1 (en) * 2006-10-04 2007-10-04 신영중공업주식회사 Lng bog reliquefaction apparatus and method with a cooler for startup
EP2003389A3 (en) 2007-06-15 2017-04-19 Daewoo Shipbuilding & Marine Engineering Co., Ltd Method and apparatus for treating boil-off gas in an LNG carrier having a reliquefaction plant, and LNG carrier having said apparatus for treating boil-off gas
KR100877254B1 (en) * 2007-08-23 2009-01-07 삼성중공업 주식회사 A boil off gas control apparatus
KR100932831B1 (en) * 2008-02-15 2009-12-21 현대중공업 주식회사 Fuel gas supply system of LNG carrier using heterogeneous fuel propulsion method
KR100936394B1 (en) * 2008-03-05 2010-01-12 대우조선해양 주식회사 Lng circulation system and method of lng carrier
KR101429550B1 (en) * 2012-05-14 2014-08-12 대우조선해양 주식회사 Lng bunkering system of lng fueled ship
DE102016002316A1 (en) * 2016-02-29 2017-08-31 Tge Marine Gas Engineering Gmbh Method for operating a liquefied gas tank and liquid gas tank for receiving LNG and boil-off gas

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900008010A (en) * 1988-11-03 1990-06-02 윌리암 에프. 마쉬 Reliquefaction of volatile matter from liquefied natural gas
KR960701346A (en) * 1993-12-30 1996-02-24 알프레드 엘마레 METHOD AND APPARATUS FOR LIQUEFYING NATURAL GAS
KR19990046828A (en) * 1997-03-21 1999-07-05 크배르너 마리타임 에이.에스 Method and device for storage and transport of liquefied natural gas
KR20010083920A (en) * 1998-10-23 2001-09-03 추후제출 Reliquefaction of boil-off from pressure LNG

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900008010A (en) * 1988-11-03 1990-06-02 윌리암 에프. 마쉬 Reliquefaction of volatile matter from liquefied natural gas
KR960701346A (en) * 1993-12-30 1996-02-24 알프레드 엘마레 METHOD AND APPARATUS FOR LIQUEFYING NATURAL GAS
KR19990046828A (en) * 1997-03-21 1999-07-05 크배르너 마리타임 에이.에스 Method and device for storage and transport of liquefied natural gas
KR20010083920A (en) * 1998-10-23 2001-09-03 추후제출 Reliquefaction of boil-off from pressure LNG

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100777136B1 (en) 2005-07-19 2007-11-28 신영중공업주식회사 Boil off gas reliquefaction apparatus using line mixer
US8028724B2 (en) 2007-02-12 2011-10-04 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and unloading of LNG from the tank
US8943841B2 (en) 2007-02-12 2015-02-03 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank ship having LNG circulating device
US10352499B2 (en) 2007-02-12 2019-07-16 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and operation of the same
US10508769B2 (en) 2007-02-12 2019-12-17 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and operation of the same
US11168837B2 (en) 2007-02-12 2021-11-09 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and operation of the same
KR100891958B1 (en) * 2007-05-08 2009-04-08 대우조선해양 주식회사 System and method for supplying fuel gas in ships
WO2009011497A3 (en) * 2007-07-19 2009-03-19 Daewoo Shipbuilding & Marine Fuel gas supply system and method of ship
US7841288B2 (en) 2008-02-11 2010-11-30 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Storage tank containing liquefied natural gas with butane
US9086188B2 (en) 2008-04-10 2015-07-21 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Method and system for reducing heating value of natural gas
KR101092388B1 (en) 2011-05-27 2011-12-09 서울대학교산학협력단 System and method for storing cryogenic fluids
WO2023136731A1 (en) * 2022-01-12 2023-07-20 Gba Marine As Device for reintroducing vapour into a volatile liquid

Also Published As

Publication number Publication date
KR20030073974A (en) 2003-09-19

Similar Documents

Publication Publication Date Title
KR100441857B1 (en) Boil off gas rel iquefaction method and system assembly of Liquefied natural gas carrier
CN108349578B (en) Ship and method for reliquefaction
KR20190135982A (en) System for treating boil-off gas of a marine structure
KR102227891B1 (en) System for treating boil-off gas
KR101326091B1 (en) Bog reliquefaction apparatus and lng bogreliquefaction method
KR101191241B1 (en) Reliquefaction apparatus of a liquified natural gas carrier
KR20190105841A (en) Liquefied Petroleum Gas Fueled Ship and Fuel Supply Method of LPG Fueled Ship
KR101593970B1 (en) BOG Multi-Step Reliquefaction System And Method For Boiled Off Gas
KR102176543B1 (en) Boil-Off Gas Treatment System and Method for Ship
KR20210023540A (en) Boil-Off Gas Reliquefaction System and Method for Ship
KR20160082033A (en) Boil Off Gas Reliquefaction System And Method
KR20160008810A (en) Fuel Gas Supply System And Method For Ship Engine
KR102253379B1 (en) Boil-Off Gas Treatment System and Method for Ship
KR101681727B1 (en) Boil Off Gas Treatment System
KR102066632B1 (en) BOG Re-liquefaction System and Method for Vessel
KR20200144696A (en) Boil-Off Gas Processing System and Method
KR101623092B1 (en) Method and apparatus for reliquefying boil-off gas using cold-heat power generation
KR101681728B1 (en) Boil Off Gas Treatment System
KR20210033093A (en) Boil-Off Gas Treatment System and Method for Ship
KR20200125374A (en) Boil-Off Gas Reliquefaction System and Method for Ship
KR20210033092A (en) Boil-Off Gas Treatment System and Method for Ship
KR102460400B1 (en) Boil-Off Gas Treatment System and Method for Ship
KR101996287B1 (en) BOG Reliquefaction System and Method for Vessels
KR102176544B1 (en) Boil-Off Gas Treatment System and Method for Ship
KR102085050B1 (en) Boil-off gas re-liquefying system

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20080716

Year of fee payment: 5

LAPS Lapse due to unpaid annual fee