KR20220110365A - Liquefied Gas Loading System and Vessel using it - Google Patents

Liquefied Gas Loading System and Vessel using it Download PDF

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KR20220110365A
KR20220110365A KR1020210012947A KR20210012947A KR20220110365A KR 20220110365 A KR20220110365 A KR 20220110365A KR 1020210012947 A KR1020210012947 A KR 1020210012947A KR 20210012947 A KR20210012947 A KR 20210012947A KR 20220110365 A KR20220110365 A KR 20220110365A
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South Korea
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supply line
liquefied gas
carrier
cooling unit
gas
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KR1020210012947A
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Korean (ko)
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민경원
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삼성중공업 주식회사
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Publication of KR20220110365A publication Critical patent/KR20220110365A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/30—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures
    • B63B27/34—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures using pipe-lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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

Abstract

A liquefied gas loading system and a carrier using the same are disclosed. According to the present embodiment, a liquefied gas loading system comprises a supply line for supplying liquefied gas stored in a marine structure to storage tanks of a liquefied gas carrier, wherein the supply line further includes a sub supply line connected to a cooling unit of the carrier to reliquefy the evaporation gas generated in the liquefaction gas storage tank of the carrier, and the liquefied gas is loaded to the carrier at the same time through the supply line and the sub supply line.

Description

액화가스 선적 시스템 및 이를 이용하는 운반선{Liquefied Gas Loading System and Vessel using it}Liquefied Gas Loading System and Vessel using it

본 발명은 액화가스 선적 시스템에 관한 것으로서, 더욱 상세하게는 액화가스를 로딩 시 손실 없이 효과적으로 실시할 수 있는 액화가스 선적 시스템 및 이를 이용한 운반선에 관한 것이다.The present invention relates to a liquefied gas shipping system, and more particularly, to a liquefied gas shipping system that can be effectively carried out without loss when loading liquefied gas, and a carrier using the same.

액화가스 예컨대, 액화천연가스(Liquefied Natural Gas;LNG)나 액화석유가스(Liquefied Petroleum Gas;LPG) 등은 해양생산설비에서 운반선의 저장탱크로 공급되며, 운반선은 육상 정제시설로 공급받은 액화가스를 이송한다. Liquefied gas, for example, liquefied natural gas (LNG) or liquefied petroleum gas (LPG) is supplied from an offshore production facility to a storage tank of a carrier, and the carrier uses the liquefied gas supplied to an onshore refining facility. transport

액화천연가스는 가스전에서 채취한 천연가스를 정제하여 얻은 메탄(CH4), 에탄(Ethane) 등을 냉각해 액화시킨 것이며, 액화석유가스는 유전에서 석유와 함께 나오는 프로판(C3H8)과 부탄(C4H10)을 주성분으로 한 가스를 액체로 만든 것이다. 액화천연가스는 액화에 의해 1/600의 부피로 줄어들고, 액화석유가스는 액화에 의해 프로판은 1/260, 부탄은 1/230의 부피로 줄어들어 저장 효율이 높다는 장점이 있다. 이러한 액화가스들은 운반선 선체에 단열 처리되어 설치되는 저장탱크로 수용되어 수송된다. Liquefied natural gas is liquefied by cooling methane (CH4), ethane, etc. obtained by refining natural gas collected from a gas field. It is made from a gas containing as a main component into a liquid. Liquefied natural gas is reduced to 1/600 volume by liquefaction, and liquefied petroleum gas is reduced to 1/260 volume of propane and 1/230 volume of butane by liquefaction, which has the advantage of high storage efficiency. These liquefied gases are transported by being accommodated in a storage tank that is installed in the hull of the carrier insulated.

한편, 해양생산설비에서 운반선으로 액화가스를 선적(로딩)할 때 양측의 온도차에 의해 액화가스로부터 다량의 증발가스(Boiled Off Gas; BOG)가 발생한다. 이 증발가스를 처리해야만 적정 압력을 유지하면서 액화가스를 안정적으로 선적할 수 있다.On the other hand, when liquefied gas is shipped (loaded) from the offshore production facility to the carrier, a large amount of BOG (Boiled Off Gas) is generated from the liquefied gas due to the temperature difference between the two sides. Only by treating this boil-off gas can the liquefied gas be stably shipped while maintaining an appropriate pressure.

액화천연가스 중 LNG의 경우에는 대부분 해양생산설비에서 가스 처리 시설을 운용하고 있기 때문에 운반선에서 발생하는 증발가스를 해양생산설비로 이송하여 처리할 수 있다. 하지만, 에탄 해양생산설비에서는 가스 처리 시설이 대부분 마련되어 있지 않기 때문에 로딩하는 운반선에서 액화하거나 연소하여 처리할 필요가 있다. 일례로, 종래에는 저장탱크의 상측에 마련되는 벤트마스트(Vent mast)로 증발가스를 흘려 보내거나, GCU(Gas Combustion Unit)을 이용하여 증발가스를 태워버리는 방안 등이 이용되었다. In the case of LNG among liquefied natural gas, most offshore production facilities operate gas treatment facilities, so BOG generated from carriers can be transported to offshore production facilities for treatment. However, since most of the ethane offshore production facilities do not have gas treatment facilities, it is necessary to liquefy or burn them in a loading carrier. For example, conventionally, a method of flowing BOG through a vent mast provided on the upper side of the storage tank or burning BOG using a gas combustion unit (GCU) has been used.

하지만, 연소 처리 방식은 최근 강화되고 있는 환경 규제로 인해 용이하지 않으며, 액화 처리 방식은 운반선의 선체 저장탱크에 액화가스 화물이 적정량 존재해야만 운용할 수 있다는 문제점이 있다.However, the combustion treatment method is not easy due to the recently strengthened environmental regulations, and the liquefaction treatment method has a problem that it can be operated only when an appropriate amount of liquefied gas cargo is present in the hull storage tank of the carrier.

한국 공개특허 제10-2018-0000651호(2018.01.03)Korean Patent Publication No. 10-2018-0000651 (2018.01.03)

본 발명의 실시예에 따른 액화가스 선적 시스템은 액화가스의 로딩을 효과적으로 실시할 수 있도록 하고자 한다. The liquefied gas shipping system according to an embodiment of the present invention is intended to effectively carry out the loading of the liquefied gas.

본 발명의 일측면에 따르면, 해양구조물에 저장된 액화가스를 액화가스 운반선의 저장탱크로 공급하는 공급라인을 포함하는 액화가스 선적 시스템에 있어서, 공급라인은 운반선의 액화가스 저장탱크에서 발생하는 증발가스를 재액화하기 위한 운반선의 쿨링부와 연결되는 서브공급라인을 더 포함하고, 액화가스는 공급라인과 서브공급라인을 통해 동시에 운반선으로 로딩되는 액화가스 선적 시스템이 제공될 수 있다. According to one aspect of the present invention, in a liquefied gas shipping system including a supply line for supplying liquefied gas stored in an offshore structure to a storage tank of a liquefied gas carrier, the supply line is boil-off gas generated from the liquefied gas storage tank of the carrier. Further comprising a sub-supply line connected to the cooling unit of the carrier for reliquefying the liquefied gas, the liquefied gas shipping system can be provided in which the liquefied gas is simultaneously loaded into the carrier through the supply line and the sub-supply line.

또한, 상기 쿨링부는 상기 운반선 저장탱크에서 발생한 증발가스를 상기 쿨링부로 공급하기 위한 재액화 공급라인과, 상기 쿨링부에서 열교환을 통해 액화된 증발가스를 상기 운반선의 저장탱크로 이송하는 재액화 배출라인을 포함하고, 상기 서브공급라인은 상기 재액화 공급라인과 연결되며, 상기 재액화 공급라인과 서브공급라인에는 각각 선택적으로 개폐되는 밸브가 마련될 수 있다. In addition, the cooling unit includes a reliquefaction supply line for supplying the BOG generated in the carrier storage tank to the cooling unit, and a reliquefaction discharge line for transferring the BOG liquefied through heat exchange in the cooling unit to the storage tank of the carrier. Including, wherein the sub-supply line is connected to the re-liquefaction supply line, the re-liquefaction supply line and the sub-supply line may be provided with valves that are selectively opened and closed, respectively.

또한, 상기 쿨링부는 공급된 액화가스를 더 낮은 온도로 냉각시키는 서브쿨러를 포함할 수 있다. In addition, the cooling unit may include a sub-cooler for cooling the supplied liquefied gas to a lower temperature.

본 발명의 타측면에 따르면, 해양구조물의 액화가스를 선체의 액화가스 저장탱크로 이송하기 위한 공급라인과, 선체의 액화가스 저장탱크에서 발생하는 증발가스를 재액화하기 위한 쿨링부와, 상기 공급라인에서 분기되어 상기 쿨링부와 연결되며, 액화가스의 로딩 시 상기 공급라인과 함께 액화가스를 상기 쿨링부로 공급하는 서브공급라인을 포함하는 운반선이 제공될 수 있다. According to another aspect of the present invention, a supply line for transferring the liquefied gas of the offshore structure to the liquefied gas storage tank of the hull, a cooling unit for re-liquefying the boil-off gas generated in the liquefied gas storage tank of the hull, and the supply A carrier may be provided that is branched from the line and connected to the cooling unit, and includes a sub-supply line for supplying the liquefied gas to the cooling unit together with the supply line when the liquefied gas is loaded.

또한, 상기 쿨링부는 선체 저장탱크에서 발생한 증발가스를 상기 쿨링부로 공급하기 위한 재액화 공급라인과, 상기 쿨링부에서 열교환을 통해 액화된 증발가스를 선체의 저장탱크로 공급하는 재액화 배출라인을 포함하고, 기 서브공급라인은 상기 재액화 공급라인과 연결될 수 있다. In addition, the cooling unit includes a re-liquefaction supply line for supplying the boil-off gas generated in the hull storage tank to the cooling unit, and a re-liquefaction discharge line for supplying the boil-off gas liquefied through heat exchange in the cooling unit to the storage tank of the hull. And, the sub-supply line may be connected to the reliquefaction supply line.

본 발명의 실시예에 따른 액화가스 선적 시스템 및 이를 이용한 운반선은 로딩 시 액화가스를 운반선의 저장탱크로 공급하는 공급라인과, 운반선에 증발가스의 재액화를 위해 마련되는 쿨링부로 공급하는 서브공급라인을 통해 운반선으로 동시에 공급함으로써, 로딩과 동시에 쿨링부를 바로 운용할 수 있어 로딩 중 발생하는 증발가스를 신속하게 처리할 수 있다. 종래에는 쿨링부를 가동하기 위해서는 운반선의 저장탱크에 어느 정도의 액화가스가 채워지기 전까지는 운용이 불가하였으나, 이와 같이 본 실시예에 따르면 로딩과 동시에 쿨링부를 바로 구동할 수 있기 때문에 시스템의 운전 효과를 극대화할 수 있다.A liquefied gas shipping system and a carrier using the same according to an embodiment of the present invention include a supply line for supplying liquefied gas to a storage tank of the carrier during loading, and a sub-supply line for supplying the carrier to a cooling unit provided for re-liquefaction of BOG. By simultaneously supplying it to the carrier through the system, the cooling unit can be operated immediately at the same time as loading, so that the boil-off gas generated during loading can be quickly processed. Conventionally, in order to operate the cooling unit, operation was impossible until a certain amount of liquefied gas was filled in the storage tank of the carrier. can be maximized.

도 1은 본 발명의 일 실시예에 따른 액화가스 선적 시스템을 개략적으로 도시한 도면이다.1 is a view schematically showing a liquefied gas shipping system according to an embodiment of the present invention.

이하에서는 본 발명의 실시예들을 첨부 도면을 참조하여 상세히 설명한다. 이하에 소개되는 실시예들은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 본 발명의 사상이 충분히 전달될 수 있도록 하기 위해 예로서 제공되는 것이다. 본 발명은 이하 설명되는 실시예들에 한정되지 않고 다른 형태로 구체화될 수도 있다. 본 발명을 명확하게 설명하기 위하여 설명과 관계없는 부분은 도면에서 생략하였으며 도면들에 있어서, 구성요소의 폭, 길이, 두께 등은 편의를 위하여 과장되어 표현될 수 있다. 명세서 전체에 걸쳐서 동일한 참조번호들은 동일한 구성요소들을 나타낸다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts irrelevant to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

도 1은 본 발명의 일 실시예에 따른 액화가스 선적 시스템을 개략적으로 도시한 도면이다.1 is a view schematically showing a liquefied gas shipping system according to an embodiment of the present invention.

설명에 앞서, 해양구조물(1)은 액화가스를 시추 및 추출하는 해양생산설비는 물론, 액화가스를 수송하는 액화가스 운반선과 액화가스를 연료로 사용하여 추진 또는 발전할 수 있는 다양한 선박을 포함할 수 있다. 예를 들면, 해양구조물은 LPG나 LNG 운반선(carrier), RV와 같은 선박을 비롯하여, FPSO, FSRU와 같은 해양 플랜트도 포함할 수 있다.Prior to the description, the offshore structure 1 includes not only offshore production facilities for drilling and extracting liquefied gas, but also liquefied gas carriers for transporting liquefied gas and various ships capable of propulsion or power generation using liquefied gas as fuel. can For example, the offshore structure may include ships such as LPG or LNG carriers and RVs, as well as offshore plants such as FPSOs and FSRUs.

또한, 운반선(2)은 액화가스 및 액화가스의 증발가스(BOG)를 저장하기 위한 저장탱크(10)와, 증발가스를 재액화하기 위한 쿨링부(20)를 포함할 수 있다.In addition, the carrier 2 may include a storage tank 10 for storing liquefied gas and boil-off gas (BOG) of the liquefied gas, and a cooling unit 20 for re-liquefying the boil-off gas.

저장탱크(10)는 단열상태를 유지하면서 연료를 액화상태로 저장하는 멤브레인형 탱크, SPB형 탱크 등을 포함할 수 있다. 운반선(2)의 저장탱크(10)에 저장되는 액화가스는 액화 상태로 저장할 수 있는 LNG(Liquefied Natural Gas), LPG(Liquefied Petroleum Gas), DME(Dimethylether), 에탄(Ethane) 중 어느 하나일 수 있으나 이에 한정되는 것은 아니다. 이하에서는 저장탱크(10)에 에탄이 저장된 것을 예로 들어 설명한다. The storage tank 10 may include a membrane type tank, an SPB type tank, and the like for storing fuel in a liquefied state while maintaining a thermal insulation state. The liquefied gas stored in the storage tank 10 of the carrier 2 may be any one of LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas), DME (Dimethylether), and ethane that can be stored in a liquefied state. However, the present invention is not limited thereto. Hereinafter, an example in which ethane is stored in the storage tank 10 will be described.

쿨링부(20)는 소정의 냉매를 사용하여 유입된 증발가스와 열교환함으로써 가스 상태의 증발가스를 차갑게 냉각시켜 액화하기 위한 장치로, 예를 들어 서브쿨러(sub-cooler)를 이용할 수 있다. The cooling unit 20 is a device for cooling and liquefying BOG in a gaseous state by using a predetermined refrigerant to exchange heat with the introduced BOG, and for example, a sub-cooler may be used.

구체적으로, 쿨링부(20)는 저장탱크(10)로부터 펌프(P)를 이용하여 증발가스가 재액화 공급라인(21)을 통해 유입되면, 증발가스의 온도를 더 낮추어 냉각시키고 이후 냉각된 액화 상태의 증발가스를 재액화 배출라인(23)을 통해 저장탱크(10)로 복귀시켜 탱크 내에 분무를 실시한다. 냉각된 액화 상태의 증발가스 분무를 통해 1차적으로는 저장탱크 내에 기체부 온도를 떨어지게 만들어 기체가 수축하는 효과로 탱크 내 압력을 낮추고, 2차적으로는 분무된 증발가스가 탱크 내의 증발가스 온도를 떨어뜨려 증발가스의 발생을 줄임으로써 탱크의 내부 압력이 상승되지 않도록 할 수 있다. 쿨링부(20)와 연결되어 있는 냉매 사이클은 일례로 N2, He 등을 냉매로 사용하고 압축기, 응축기, 팽창기, 증발기 등이 포함되어 있어서, 열교환으로 기화된 냉매의 온도를 낮추어 액화시킴으로써 냉매를 지속적으로 사용할 수 있다. Specifically, when the BOG is introduced from the storage tank 10 through the re-liquefaction supply line 21 using the pump P, the cooling unit 20 lowers the temperature of the BOG and then cools the cooled liquefaction. The boil-off gas in the state is returned to the storage tank 10 through the reliquefaction discharge line 23 and sprayed in the tank. By spraying the BOG in the cooled liquefied state, the temperature of the gas in the storage tank is lowered firstly to reduce the pressure in the tank due to the effect of gas shrinkage, and secondly, the atomized BOG lowers the BOG temperature in the tank. It is possible to prevent the internal pressure of the tank from rising by dropping it to reduce the generation of boil-off gas. The refrigerant cycle connected to the cooling unit 20 uses, for example, N2, He, etc. as a refrigerant and includes a compressor, a condenser, an expander, an evaporator, etc. can be used as

본 실시예에 따른 액화가스 선적 시스템은 해양구조물(1)과 액화가스 운반선의 저장탱크(10)를 연결하여 액화가스를 공급하는 공급라인(L1)과, 해양구조물(1)과 액화가스 운반선(2)의 상술한 쿨링부(20)를 연결하는 서브공급라인(L2)을 포함할 수 있다.The liquefied gas shipping system according to this embodiment includes a supply line (L1) for supplying liquefied gas by connecting the offshore structure (1) and the storage tank (10) of the liquefied gas carrier, and the offshore structure (1) and the liquefied gas carrier ( 2) may include a sub-supply line (L2) connecting the above-described cooling unit (20).

서브공급라인(L2)은 공급라인(L1)으로부터 도시된 바와 같이 분기되거나 또는 별도로 마련될 수도 있다. 별도로 설치될 경우 각 라인에는 별도의 펌프(미도시)가 장착될 수 있다. The sub-supply line L2 may be branched as shown from the supply line L1 or may be provided separately. When separately installed, a separate pump (not shown) may be mounted on each line.

또한, 서브공급라인(L2)은 구체적으로 쿨링부(20)의 상류측 재액화 공급라인(21)에 연결될 수 있으며, 이때 서브공급라인(L2)과 재액화 공급라인(21)에는 각각 선택적으로 개폐될 수 있는 밸브가 마련될 수 있다. In addition, the sub-supply line (L2) may be specifically connected to the upstream reliquefaction supply line 21 of the cooling unit 20, at this time the sub-supply line (L2) and the reliquefaction supply line 21 are each selectively A valve that can be opened and closed may be provided.

상기와 같이 마련된 본 실시예에 따른 액화가스 선적 시스템은 로딩 시 해양구조물의 액화가스는 공급라인(L1)과 서브공급라인(L2)을 통해 동시에 운반선으로 이송할 수 있다. The liquefied gas shipping system according to the present embodiment prepared as described above may simultaneously transport the liquefied gas of the offshore structure to the carrier through the supply line L1 and the sub-supply line L2 during loading.

따라서, 공급라인(L1)을 통해 이송되는 액화가스는 운반선(2)의 저장탱크(10)로 선적되고, 서브공급라인(L2)을 통해 이송되는 액화가스는 쿨링부(20)를 통해 더 낮은 온도로 서브쿨링된 후 운반선(2)의 저장탱크(10)로 공급된다. Accordingly, the liquefied gas transferred through the supply line L1 is shipped to the storage tank 10 of the carrier ship 2 , and the liquefied gas transferred through the sub-supply line L2 is lowered through the cooling unit 20 . After being sub-cooled to temperature, it is supplied to the storage tank 10 of the carrier 2 .

즉, 서브공급라인(L2)을 통해 운반선(2)의 저장탱크(10)로 공급된 냉각된 액화가스는 탱크 내에 분무되면서, 1차적으로는 저장탱크 내에 기체부 온도를 떨어지게 만들어 기체가 수축하는 효과로 탱크 내 압력을 낮추고, 2차적으로는 분무된 증발가스가 탱크 내의 증발가스 온도를 떨어뜨려 증발가스의 발생을 줄이게 된다. That is, the cooled liquefied gas supplied to the storage tank 10 of the carrier ship 2 through the sub-supply line L2 is sprayed into the tank, and the temperature of the gas part in the storage tank is primarily lowered to cause the gas to contract. As an effect, the pressure in the tank is lowered, and secondarily, the atomized BOG lowers the BOG temperature in the tank, thereby reducing the generation of BOG.

한편, 액화가스의 로딩(선적)이 완료된 후 운항되는 운반선은 도 1에 도시된 바와 같이, 쿨링부(20)의 재액화 공급라인(21) 및 재액화 배출라인(23)을 통해 저장탱크(10)에서 발생되는 증발가스를 재액화하여 저장탱크(10)로 복귀시킬 수 있으며, 일부 증발가스는 플로우 라인(L3)을 통해 벤트마스트(Vent mast)로 흘려 보내거나, GCU(Gas Combustion Unit)와 같은 수요처(E)을 이용하여 태워버릴 수 있다. On the other hand, the carrier ship operated after the loading (shipment) of the liquefied gas is completed is, as shown in FIG. 1, the storage tank ( The boil-off gas generated in 10) can be re-liquefied and returned to the storage tank 10, and some of the boil-off gas flows through the flow line (L3) to the vent mast, or GCU (Gas Combustion Unit) It can be burned using the same demand (E).

이상 상기 실시예에서는 파이프라인인 공급라인과 서브공급라인의 위치를 구체적으로 한정하지 않았으나 예를 들어 해양구조물에 마련되어 운반선에 연결하거나 또는 운반선에 마련되어 해양구조물에 연결될 수 있음은 물론이다. In the above embodiment, the positions of the supply line and the sub-supply line, which are pipelines, are not specifically limited, but, for example, it may be provided in an offshore structure and connected to a carrier or may be provided in a carrier and connected to an offshore structure.

또한, 상기에서는 특정의 실시예에 대하여 도시하고 설명하였다. 그러나, 본 발명은 상기한 실시예에만 한정되지 않으며, 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 이하의 청구범위에 기재된 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경 실시할 수 있을 것이다. In addition, specific embodiments have been shown and described above. However, the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the invention pertains can make various changes without departing from the spirit of the invention described in the claims below. will be able

1..해양구조물 2..운반선
10..저장탱크 20..쿨링부1.. Offshore structures 2.. Carriers
10..Storage tank 20..Cooling part

Claims (5)

해양구조물에 저장된 액화가스를 액화가스 운반선의 저장탱크로 공급하는 공급라인을 포함하는 액화가스 선적 시스템에 있어서,
상기 공급라인은 상기 운반선의 액화가스 저장탱크에서 발생하는 증발가스를 재액화하기 위한 운반선의 쿨링부와 연결되는 서브공급라인을 더 포함하고,
액화가스는 상기 공급라인과 상기 서브공급라인을 통해 동시에 운반선으로 로딩되는 액화가스 선적 시스템.In the liquefied gas shipping system comprising a supply line for supplying the liquefied gas stored in the offshore structure to the storage tank of the liquefied gas carrier,
The supply line further includes a sub-supply line connected to the cooling unit of the carrier for re-liquefying the boil-off gas generated in the liquefied gas storage tank of the carrier,
A liquefied gas shipping system in which liquefied gas is simultaneously loaded into a carrier through the supply line and the sub-supply line. 제1항에 있어서,
상기 쿨링부는
상기 운반선 저장탱크에서 발생한 증발가스를 상기 쿨링부로 공급하기 위한 재액화 공급라인과, 상기 쿨링부에서 열교환을 통해 액화된 증발가스를 상기 운반선의 저장탱크로 이송하는 재액화 배출라인을 포함하고,
상기 서브공급라인은 상기 재액화 공급라인과 연결되며,
상기 재액화 공급라인과 서브공급라인에는 각각 선택적으로 개폐되는 밸브가 마련되는 액화가스 선적 시스템.According to claim 1,
The cooling unit
A reliquefaction supply line for supplying the BOG generated in the carrier storage tank to the cooling unit, and a reliquefaction discharge line for transferring the BOG liquefied through heat exchange in the cooling unit to the storage tank of the carrier,
The sub-supply line is connected to the re-liquefaction supply line,
A liquefied gas shipping system in which a valve that is selectively opened and closed is provided in the reliquefaction supply line and the sub-supply line, respectively. 제2항에 있어서,
상기 쿨링부는 공급된 액화가스를 더 낮은 온도로 냉각시키는 서브쿨러를 포함하는 액화가스 선적 시스템.3. The method of claim 2,
The cooling unit liquefied gas shipping system including a sub-cooler for cooling the supplied liquefied gas to a lower temperature. 해양구조물의 액화가스를 선체의 액화가스 저장탱크로 이송하기 위한 공급라인과,
선체의 액화가스 저장탱크에서 발생하는 증발가스를 재액화하기 위한 쿨링부와,
상기 공급라인에서 분기되어 상기 쿨링부와 연결되며, 액화가스의 로딩 시 상기 공급라인과 함께 액화가스를 상기 쿨링부로 공급하는 서브공급라인을 포함하는 운반선. A supply line for transferring the liquefied gas of the offshore structure to the liquefied gas storage tank of the hull;
A cooling unit for re-liquefying the boil-off gas generated in the liquefied gas storage tank of the hull;
and a sub-supply line branched from the supply line and connected to the cooling unit, and configured to supply liquefied gas to the cooling unit together with the supply line when the liquefied gas is loaded. 제4항에 있어서,
상기 쿨링부는
선체 저장탱크에서 발생한 증발가스를 상기 쿨링부로 공급하기 위한 재액화 공급라인과, 상기 쿨링부에서 열교환을 통해 액화된 증발가스를 선체의 저장탱크로 공급하는 재액화 배출라인을 포함하고,
상기 서브공급라인은 상기 재액화 공급라인과 연결되는 운반선.5. The method of claim 4,
The cooling unit
A re-liquefaction supply line for supplying the boil-off gas generated in the hull storage tank to the cooling unit, and a re-liquefaction discharge line for supplying the boil-off gas liquefied through heat exchange in the cooling unit to the storage tank of the hull,
The sub-supply line is a carrier line connected to the reliquefaction supply line.
KR1020210012947A 2021-01-29 2021-01-29 Liquefied Gas Loading System and Vessel using it KR20220110365A (en)

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Citations (1)

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Publication number Priority date Publication date Assignee Title
KR20180000651A (en) 2016-06-23 2018-01-03 현대중공업 주식회사 liquefaction system of boil-off gas and ship having the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180000651A (en) 2016-06-23 2018-01-03 현대중공업 주식회사 liquefaction system of boil-off gas and ship having the same

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