KR20210090440A - Liquefied Gas Loading System And Method For Ship - Google Patents

Liquefied Gas Loading System And Method For Ship Download PDF

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KR20210090440A
KR20210090440A KR1020200003727A KR20200003727A KR20210090440A KR 20210090440 A KR20210090440 A KR 20210090440A KR 1020200003727 A KR1020200003727 A KR 1020200003727A KR 20200003727 A KR20200003727 A KR 20200003727A KR 20210090440 A KR20210090440 A KR 20210090440A
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South Korea
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gas
liquefied gas
boil
compander
ship
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KR1020200003727A
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Korean (ko)
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류찬선
김형우
이윤주
김윤기
송지훈
허성욱
오민혁
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대우조선해양 주식회사
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Priority to KR1020200003727A priority Critical patent/KR20210090440A/en
Publication of KR20210090440A publication Critical patent/KR20210090440A/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
    • B63B27/24—Arrangement of ship-based loading or unloading equipment for cargo or passengers of 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
    • B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
    • 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
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • 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
    • F17C7/02—Discharging liquefied 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Disclosed are a liquefied gas loading system for a ship and a method thereof. The liquefied gas loading system for a ship in accordance with the present invention comprises: a cargo tank provided on the ship and storing liquefied gas transferred from an outboard liquefied gas terminal; a pressure tank provided in the ship to store boil-off gas generated from the liquefied gas when the ship operates; a compander expansion unit receiving the boil-off gas stored in the pressure tank, expanding the boil-off gas and transferring the boil-off gas to the liquefied gas terminal; and a compander compression unit for receiving and compressing the boil-off gas generated when the liquefied gas is transferred to the cargo tank and transferring the boil-off gas to the liquefied gas terminal. The compander compression unit is axially connected to the compander expansion unit to compress the boil-off gas by the expansion energy of the boil-off gas in the compander expansion unit. The present invention can ensure the safety of the ship by appropriately adjusting the pressure of the cargo tank.

Description

선박의 액화가스 선적 시스템 및 방법{Liquefied Gas Loading System And Method For Ship}Liquefied Gas Loading System And Method For Ship

본 발명은 선박의 액화가스 선적 시스템 및 방법에 관한 것으로, 더욱 상세하게는 액화가스의 선적 시 카고탱크에서 발생하는 증발가스를 증발가스의 팽창에너지에 의해 압축하여 터미널로 이송하는 선박의 액화가스 선적 시스템 및 방법에 관한 것이다. The present invention relates to a ship's liquefied gas shipping system and method, and more particularly, to a ship's liquefied gas shipment in which BOG generated in a cargo tank is compressed by the expansion energy of BOG when liquefied gas is loaded and transferred to a terminal. It relates to systems and methods.

근래, 액화천연가스(Liquefied Natural Gas, LNG) 등의 액화가스의 소비량이 전 세계적으로 급증하는 추세이다. 가스를 저온에서 액화시킨 액화가스는 가스에 비해 부피가 매우 작아지므로 저장 및 이송 효율을 높일 수 있는 장점이 있다. 또한, 액화천연가스를 비롯한 액화가스는 액화공정 중에 대기오염 물질을 제거하거나 줄일 수 있어, 연소시 대기오염 물질 배출이 적은 친환경 연료로도 볼 수 있다. In recent years, the consumption of liquefied gas such as liquefied natural gas (LNG) is rapidly increasing worldwide. The liquefied gas obtained by liquefying the gas at a low temperature has the advantage of increasing the storage and transport efficiency because the volume is very small compared to the gas. In addition, since liquefied gas including liquefied natural gas can remove or reduce air pollutants during the liquefaction process, it can be viewed as an eco-friendly fuel that emits less air pollutants during combustion.

액화천연가스는 메탄(methane)을 주성분으로 하는 천연가스를 약 -163℃로 냉각해서 액화시킴으로써 얻을 수 있는 무색투명한 액체로서, 천연가스와 비교해 약 1/600 정도의 부피를 가진다. 따라서, 천연가스를 액화시켜 이송할 경우 매우 효율적으로 이송할 수 있게 된다.Liquefied natural gas is a colorless and transparent liquid that can be obtained by cooling and liquefying natural gas containing methane to about -163°C, and has a volume of about 1/600 compared to natural gas. Accordingly, when the natural gas is liquefied and transported, it can be transported very efficiently.

그러나 천연가스의 액화 온도는 상압 -163 ℃의 극저온이므로, 액화천연가스는 온도변화에 민감하여 쉽게 증발된다. 이로 인해 액화천연가스를 저장하는 저장탱크에는 단열처리를 하지만, 외부의 열이 저장탱크에 지속적으로 전달되므로 액화천연가스 수송과정에서 저장탱크 내에서는 지속적으로 액화천연가스가 자연 기화되면서 증발가스(Boil-Off Gas, BOG)가 발생한다.However, since the liquefaction temperature of natural gas is a cryogenic temperature of -163 ℃ atmospheric pressure, liquefied natural gas is sensitive to temperature changes and evaporates easily. For this reason, the storage tank that stores the liquefied natural gas is insulated, but since external heat is continuously transferred to the storage tank, the liquefied natural gas is continuously naturally vaporized in the storage tank during the process of transporting the liquefied natural gas, resulting in boil-off gas (Boil). -Off Gas, BOG) occurs.

증발가스는 일종의 손실로서 수송효율에 있어서 중요한 문제이다. 또한, 저장탱크 내에 증발가스가 축적되면 탱크 내압이 과도하게 상승할 수 있어, 심하면 탱크가 파손될 위험도 있다. 따라서, 저장탱크 내에서 발생하는 증발가스를 처리하기 위한 다양한 방법이 연구되는데, 최근에는 증발가스의 처리를 위해, 증발가스를 재액화하여 저장탱크로 복귀시키는 방법, 증발가스를 선박의 엔진 등 연료수요처의 에너지원으로 사용하는 방법 등이 사용되고 있다.BOG is a type of loss and is an important problem in transport efficiency. In addition, when the boil-off gas is accumulated in the storage tank, the internal pressure of the tank may increase excessively, and in severe cases, there is a risk of damage to the tank. Therefore, various methods for treating BOG generated in the storage tank are being studied. Recently, for the treatment of BOG, a method of re-liquefying BOG and returning it to the storage tank, and turning BOG into fuel such as engines of ships, etc. A method of using it as an energy source of a consumer is being used.

도 1에는 종래의 LNG 터미널로부터의 LNG 선적 방법을 개략적으로 도시하였다. 1 schematically shows a method of shipping LNG from a conventional LNG terminal.

도 1에 도시된 바와 같이 LNG 터미널(LT)로부터 LNG를 운반할 LNG 운반선의 카고탱크(CT)로 LNG를 이송하여 선적한다. 이때 카고탱크에 채워지는 LNG로부터 증발가스가 발생하는데, 카고탱크의 압력 조절을 위해 증발가스를 배출시켜 LNG 터미널로 다시 이송한다. As shown in FIG. 1 , the LNG is transported from the LNG terminal (LT) to the cargo tank (CT) of the LNG carrier that will transport the LNG for shipment. At this time, boil-off gas is generated from the LNG filled in the cargo tank, and the boil-off gas is discharged to control the pressure of the cargo tank and transferred back to the LNG terminal.

LNG 터미널로의 이송을 위해 증발가스에는 압축기(10)에 의해 일정 정도의 압력을 가하게 되는데, 종래에는 전기 모터(20)로 구동되는 압축기를 이용해오고 있다.A certain amount of pressure is applied to the boil-off gas by the compressor 10 for transport to the LNG terminal, and a compressor driven by the electric motor 20 has been used in the prior art.

본 발명에서는 LNG 터미널로부터 LNG 운반선에 LNG를 선적하면서 발생하는 증발가스를 이송하되 전기 에너지 사용을 절감할 수 있는 방법을 제안하고자 한다.The present invention intends to propose a method for reducing the use of electric energy while transporting boil-off gas generated while loading LNG from an LNG terminal to an LNG carrier.

상술한 과제를 해결하기 위한 본 발명의 일 측면에 따르면, 선박에 마련되며 선외 액화가스 터미널로부터 이송되는 액화가스를 저장하는 카고탱크;According to an aspect of the present invention for solving the above problems, a cargo tank provided on a ship and storing liquefied gas transferred from an outboard liquefied gas terminal;

상기 선박의 운항 시 상기 액화가스로부터 발생하는 증발가스를 저장하도록 상기 선박에 마련되는 압력탱크; a pressure tank provided in the vessel to store boil-off gas generated from the liquefied gas when the vessel operates;

상기 압력탱크에 저장된 상기 증발가스를 공급받아 팽창시켜 상기 액화가스 터미널로 이송하는 컴팬더 팽창부; 및a compander expansion unit receiving the boil-off gas stored in the pressure tank, expanding it, and transferring it to the liquefied gas terminal; and

상기 카고탱크로 액화가스가 이송될 때 발생하는 증발가스를 공급받아 압축시켜 상기 액화가스 터미널로 이송하는 컴팬더 압축부;를 포함하여, Including; including; a compander compression unit for receiving the boil-off gas generated when the liquefied gas is transferred to the cargo tank, compressing it and transferring it to the liquefied gas terminal;

상기 컴팬더 압축부는 상기 컴팬더 팽창부에 축으로 연결되어 상기 컴팬더 팽창부에서의 증발가스의 팽창에너지에 의해 상기 증발가스를 압축하는 것을 특징으로 하는 선박의 액화가스 선적 시스템이 제공된다. The compander compression unit is axially connected to the compander expansion unit to compress the boil-off gas by the expansion energy of the boil-off gas in the compander expansion unit.

바람직하게는, 상기 선박이 운항하는 동안 상기 카고탱크 내 액화가스로부터 발생하는 증발가스를 상기 압력탱크에 저장해 두고, 상기 액화가스 터미널로부터 상기 선박으로 액화가스를 선적하는 동안 상기 압력탱크에 저장된 증발가스를 팽창시켜 매니폴드를 통해 상기 액화가스 터미널로 이송하면서, 상기 컴팬더 팽창부에서의 증발가스의 팽창에너지에 의해, 액화가스의 선적 시 상기 카고탱크에서 발생하는 증발가스를 압축하여 상기 액화가스 터미널로 이송할 수 있다. Preferably, the boil-off gas generated from the liquefied gas in the cargo tank is stored in the pressure tank while the ship is operating, and the boil-off gas stored in the pressure tank while loading the liquefied gas from the liquefied gas terminal to the ship. while expanding and transporting the liquefied gas to the liquefied gas terminal through the manifold, by compressing the evaporative gas generated in the cargo tank when the liquefied gas is shipped by the expansion energy of the boil-off gas in the compander expansion part, the liquefied gas terminal can be transferred to

바람직하게는, 상기 압력탱크와 상기 컴팬더 팽창부 사이의 배관에 마련되어 상기 압력탱크에 저장된 증발가스를 일정한 압력으로 상기 컴팬더 팽창부로 공급하는 압력 조절 밸브를 더 포함할 수 있다.Preferably, a pressure control valve provided in a pipe between the pressure tank and the expansion unit of the compander to supply the boil-off gas stored in the pressure tank to the expansion unit of the compander at a constant pressure may be further included.

바람직하게는, 상기 압력탱크는 IMO C type 탱크로 마련될 수 있다. Preferably, the pressure tank may be provided as an IMO C type tank.

본 발명의 다른 측면에 따르면, 선외 액화가스 터미널로부터 액화가스를 이송하여 선박의 카고탱크에 선적하되, According to another aspect of the present invention, the liquefied gas is transferred from the outboard liquefied gas terminal and loaded into the cargo tank of the ship,

상기 선박이 운항하는 동안 상기 카고탱크 내 액화가스로부터 발생하는 증발가스를 압력탱크에 저장해 두고, While the vessel is operating, the boil-off gas generated from the liquefied gas in the cargo tank is stored in a pressure tank,

상기 카고탱크로 액화가스가 선적될 때 상기 압력탱크에 저장된 증발가스를 컴팬더 팽창부로 보내 팽창시켜 상기 액화가스 터미널로 이송하면서, When the liquefied gas is shipped to the cargo tank, the boil-off gas stored in the pressure tank is sent to the compander expansion unit to expand and transport to the liquefied gas terminal,

상기 액화가스의 선적 시 상기 카고탱크에서 발생하는 증발가스를 상기 컴팬더 팽창부와 축으로 연결된 컴팬더 압축부에서 상기 증발가스의 팽창에너지에 의해 압축하여 상기 액화가스 터미널로 이송하는 것을 특징으로 하는 선박의 액화가스 선적 방법이 제공된다. When the liquefied gas is shipped, the boil-off gas generated in the cargo tank is compressed by the expansion energy of the boil-off gas in a compander compression unit axially connected to the compander expansion unit and transferred to the liquefied gas terminal. A method of shipping liquefied gas on a ship is provided.

바람직하게는, 상기 압력탱크와 상기 컴팬더 팽창부 사이의 배관에 압력 조절 밸브를 마련하여, 상기 압력탱크에 저장된 증발가스를 일정한 압력으로 상기 컴팬더 팽창부로 공급하여 상기 액화가스 터미널로 이송할 수 있다. Preferably, a pressure control valve is provided in a pipe between the pressure tank and the compander expansion unit to supply the boil-off gas stored in the pressure tank to the compander expansion unit at a constant pressure and transport it to the liquefied gas terminal. have.

바람직하게는, 상기 압력탱크는 IMO C type 탱크로 마련될 수 있다. Preferably, the pressure tank may be provided as an IMO C type tank.

본 발명에서는, 선박이 운항하는 동안 액화가스로부터 발생하는 증발가스를 압력탱크에 저장해두고, 터미널에서 카고탱크로 액화가스를 선적할 때 압력탱크에 저장된 증발가스를 팽창시켜 터미널로 이송하면서, 액화가스의 선적 시 카고탱크에서 발생하는 증발가스를 증발가스의 팽창에너지에 의해 압축하여 액화가스 터미널로 이송한다. In the present invention, while the BOG generated from the liquefied gas is stored in the pressure tank while the ship is operating, the BOG stored in the pressure tank is expanded and transferred to the terminal when the liquefied gas is loaded from the terminal to the cargo tank, while transporting the liquefied gas to the terminal. The BOG generated in the cargo tank is compressed by the expansion energy of BOG and transferred to the liquefied gas terminal.

이를 통해 선박이 운항하는 동안 액화가스로부터 발생하는 증발가스를 간편하게 처리할 수 있고, 동시에 카고탱크로의 액화가스 선적 시 카고탱크에서 발생하는 증발가스를 터미널로 이송하기 위해 필요한 전기 에너지를 절감할 수 있다. Through this, BOG generated from liquefied gas can be easily processed while the vessel is operating, and at the same time, the electrical energy required to transport BOG generated from the cargo tank to the terminal when liquefied gas is loaded into the cargo tank can be reduced. have.

또한, 카고탱크의 압력을 적절히 조절하여 선박의 안전을 확보할 수 있다. In addition, it is possible to secure the safety of the ship by appropriately adjusting the pressure of the cargo tank.

도 1에는 종래의 LNG 선적 방법을 개략적으로 도시한다.
도 2에는 본 발명의 일 실시예에 따른 LNG 선적 시스템을 개략적으로 도시한다. 1 schematically shows a conventional LNG shipping method.
2 schematically shows an LNG shipping system according to an embodiment of the present invention.

본 발명의 동작상 이점 및 본 발명의 실시에 의하여 달성되는 목적을 충분히 이해하기 위해서는 본 발명의 바람직한 실시예를 예시하는 첨부도면 및 첨부도면에 기재된 내용을 참조하여야만 한다.In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대해 구성 및 작용을 상세히 설명하면 다음과 같다. 여기서 각 도면의 구성요소들에 대해 참조 부호를 부가함에 있어 동일한 구성요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호로 표기되었음에 유의하여야 한다.Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference signs to the elements of each drawing, it should be noted that only the same elements are indicated by the same reference signs as possible even though they are indicated on different drawings.

후술하는 실시예에서는 대표적인 액화가스 중 하나인 LNG가 적용되는 것을 예로 들어 설명하지만, 본 발명은, 가스를 저온으로 액화시켜 수송할 수 있고, 저장된 상태에서 증발가스가 발생하는 모든 종류의 액화가스의 선적에 적용될 수 있다. 이러한 액화가스는 예를 들어 LNG(Liquefied Natural Gas), LEG(Liquefied Ethane Gas), LPG(Liquefied Petroleum Gas), 액화에틸렌가스(Liquefied Ethylene Gas), 액화프로필렌가스(Liquefied Propylene Gas) 등과 같은 액화석유화학가스일 수 있다.In the embodiment to be described later, it is explained that LNG, which is one of the representative liquefied gases, is applied as an example, but the present invention can liquefy the gas at a low temperature and transport it, and all kinds of liquefied gas that generate boil-off gas in a stored state. applicable to shipments. Such liquefied gas is, for example, liquefied petrochemicals such as LNG (Liquefied Natural Gas), LEG (Liquefied Ethane Gas), LPG (Liquefied Petroleum Gas), Liquefied Ethylene Gas, Liquefied Propylene Gas, etc. It may be gas.

또한, 이하 본 발명에서의 선박은, LNG를 공급받는 저장탱크가 마련된 모든 종류의 선박으로, LNG 운반선(LNG Carrier), LNG 벙커링 선박, 액화석유가스 운반선, LNG RV(Regasification Vessel)와 같은 자체 추진 능력을 갖춘 선박을 비롯하여, LNG FPSO(Floating Production Storage Offloading), LNG FSRU(Floating Storage Regasification Unit)와 같이 추진 능력을 갖추지는 않지만 해상에 부유하고 있는 해상 구조물도 포함될 수 있다. In addition, the vessel in the present invention is any type of vessel provided with a storage tank for receiving LNG, and is self-propelled such as an LNG carrier, an LNG bunkering vessel, a liquefied petroleum gas carrier, and an LNG RV (Regasification Vessel). It may include ships with the capability, as well as offshore structures that do not have propulsion capabilities, such as LNG Floating Production Storage Offloading (FPSO) and LNG FSRU (Floating Storage Regasification Unit), but are floating in the sea.

도 2에는 본 발명의 일 실시예에 따른 LNG 선적 시스템을 개략적으로 도시하였다. 2 schematically shows an LNG shipping system according to an embodiment of the present invention.

도 2에 도시된 바와 같이, 본 실시예의 액화가스 선적 시스템은 선박의 카고탱크(CT)로 선외 액화가스 터미널(LT)에서 액화가스, 즉 LNG를 선적하기 위한 시스템이다. As shown in FIG. 2 , the liquefied gas shipping system of this embodiment is a system for loading liquefied gas, that is, LNG, from an outboard liquefied gas terminal (LT) to a cargo tank (CT) of a ship.

본 시스템은, 선박에 마련되며 선외 액화가스 터미널(LT)로부터 이송되는 액화가스를 저장하는 카고탱크(CT), 액화가스로부터 발생하는 증발가스를 공급받아 저장하도록 선박에 마련되는 압력탱크(100), 선박에 마련되며 팽창부와 압축부가 축으로 연결되는 컴팬더(200)를 포함한다. This system is provided on a ship and a cargo tank (CT) for storing liquefied gas transferred from an outboard liquefied gas terminal (LT), a pressure tank (100) provided on a ship to receive and store boil-off gas generated from liquefied gas , it is provided on the ship and includes a compander 200 in which the expansion unit and the compression unit are axially connected.

컴팬더(200)를 이루는 컴팬더 팽창부(210)에서는 압력탱크(100)에 저장된 증발가스를 공급받아 팽창시켜 액화가스 터미널(LT)로 이송하고, 카고탱크(CT)로 액화가스가 이송될 때 발생하는 증발가스를 컴팬더 압축부(220)가 공급받아 컴팬더 팽창부에서의 증발가스의 팽창에너지를 이용하여 압축시켜 액화가스 터미널로 이송한다. The compander expansion unit 210 constituting the compander 200 receives the boil-off gas stored in the pressure tank 100, expands it, and transfers it to the liquefied gas terminal (LT), and the liquefied gas is transferred to the cargo tank (CT). The boil-off gas generated when the compander compression unit 220 is supplied, compresses the boil-off gas using the expansion energy of the boil-off gas in the compander expansion portion, and transfers it to the liquefied gas terminal.

압력탱크(100)는 0.5 bar 이상의 압력을 견딜 수 있는 내압용기, 보다 바람직하게는 1 bar 이상의 압력을 견딜 수 있는 IMO C type 탱크로 마련될 수 있다. 압력탱크는 증발가스의 이송이 수월하도록 카고탱크의 상부 데크에 배치할 수 있다. The pressure tank 100 may be provided as a pressure resistant container capable of withstanding a pressure of 0.5 bar or more, more preferably an IMO C type tank capable of withstanding a pressure of 1 bar or more. The pressure tank may be disposed on the upper deck of the cargo tank to facilitate the transfer of boil-off gas.

압력탱크(100)와 컴팬더 팽창부(210) 사이의 배관에는 압력 조절 밸브(300)가 마련되어 압력탱크에 저장된 증발가스를 일정한 압력으로 컴팬더 팽창부로 공급한다. A pressure control valve 300 is provided in the pipe between the pressure tank 100 and the compander expansion unit 210 to supply the boil-off gas stored in the pressure tank to the compander expansion unit at a constant pressure.

본 실시예의 시스템에서는, 선박이 운항하는 동안 카고탱크(CT) 내 액화가스로부터 발생하는 증발가스를 압력탱크(100)로 보내 압력탱크에 저장해 둔다. In the system of this embodiment, the boil-off gas generated from the liquefied gas in the cargo tank CT is sent to the pressure tank 100 while the ship is operating and stored in the pressure tank.

그리고 액화가스 터미널(LT)에서 액화가스의 선적이 이루어질 때, 즉 터미널에서 매니폴드를 거쳐 선박의 카고탱크로 액화가스가 선적되는 동안 압력탱크에 저장된 증발가스를 컴팬더 팽창부(210)로 보내 팽창시켜 매니폴드를 거쳐 액화가스 터미널로 이송한다. And when the liquefied gas is shipped from the liquefied gas terminal (LT), that is, the boil-off gas stored in the pressure tank is sent to the compander expansion unit 210 while the liquefied gas is loaded from the terminal to the cargo tank of the ship through the manifold. It is expanded and transported to the liquefied gas terminal through the manifold.

이때 컴팬더 팽창부와 축으로 연결된 컴팬더 압축기(220)에서는 증발가스의 팽창에너지를 동력원으로 하여, 액화가스의 선적 시 카고탱크(CT)에서 발생하는 증발가스를 압축한 후 액화가스 터미널(LT)로 이송할 수 있다. 카고탱크로부터 액화가스 터미널로의 증발가스 이송을 통해 카고탱크의 압력을 적절히 조절함으로써 원활하게 카고탱크로 액화가스의 선적이 이루어질 수 있다. At this time, in the compander compressor 220 connected to the compander expansion part and the shaft, the expansion energy of the boil-off gas is used as a power source to compress the boil-off gas generated from the cargo tank (CT) during shipment of the liquefied gas, and then the liquefied gas terminal (LT). ) can be transferred to By properly adjusting the pressure of the cargo tank through the transfer of boil-off gas from the cargo tank to the liquefied gas terminal, the shipment of the liquefied gas to the cargo tank can be made smoothly.

터미널로 이송되는 증발가스는 컴팬더 압축기를 통해 0.9 bar 내외로 압축되어 이송될 수 있다. BOG transported to the terminal can be compressed to about 0.9 bar through a compander compressor and transported.

이상에서 살펴본 바와 같이 본 시스템을 통해 선박이 운항하는 동안 액화가스로부터 발생하는 증발가스를 간편하게 처리할 수 있고, 동시에 카고탱크로의 액화가스 선적 시 카고탱크에서 발생하는 증발가스를 터미널로 이송하기 위해 필요한 전기 에너지를 절감할 수 있다. As described above, through this system, BOG generated from liquefied gas can be conveniently processed while the ship is operating, and at the same time, BOG generated from the cargo tank can be transferred to the terminal when the liquefied gas is loaded into the cargo tank. Required electrical energy can be reduced.

또한, 카고탱크의 압력을 적절히 조절하여 선박의 안전 확보에도 기여할 수 있다. In addition, it can contribute to securing the safety of the ship by appropriately adjusting the pressure of the cargo tank.

본 발명은 상기 실시예에 한정되지 않고, 본 발명의 기술적 요지를 벗어나지 아니하는 범위 내에서 다양하게 수정 또는 변형되어 실시될 수 있음은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어서 자명한 것이다. The present invention is not limited to the above embodiments, and it is apparent to those of ordinary skill in the art that the present invention can be implemented with various modifications or variations without departing from the technical gist of the present invention. did it

CT: 카고탱크
LT: 액화가스 터미널
100: 압력탱크
200: 컴팬더
210: 컴팬더 팽창부
220: 컴팬더 압축부
300: 압력 조절 밸브CT: cargo tank
LT: Liquefied gas terminal
100: pressure tank
200: compander
210: compander expansion unit
220: compander compression unit
300: pressure regulating valve

Claims (7)

선박에 마련되며 선외 액화가스 터미널로부터 이송되는 액화가스를 저장하는 카고탱크;
상기 선박의 운항 시 상기 액화가스로부터 발생하는 증발가스를 저장하도록 상기 선박에 마련되는 압력탱크;
상기 압력탱크에 저장된 상기 증발가스를 공급받아 팽창시켜 상기 액화가스 터미널로 이송하는 컴팬더 팽창부; 및
상기 카고탱크로 액화가스가 이송될 때 발생하는 증발가스를 공급받아 압축시켜 상기 액화가스 터미널로 이송하는 컴팬더 압축부;를 포함하여,
상기 컴팬더 압축부는 상기 컴팬더 팽창부에 축으로 연결되어 상기 컴팬더 팽창부에서의 증발가스의 팽창에너지에 의해 상기 증발가스를 압축하는 것을 특징으로 하는 선박의 액화가스 선적 시스템. a cargo tank provided on a ship and storing liquefied gas transferred from an outboard liquefied gas terminal;
a pressure tank provided in the vessel to store boil-off gas generated from the liquefied gas when the vessel operates;
a compander expansion unit receiving the boil-off gas stored in the pressure tank, expanding it, and transferring it to the liquefied gas terminal; and
Including; including; and a compander compression unit for receiving the boil-off gas generated when the liquefied gas is transferred to the cargo tank, compressing it and transferring it to the liquefied gas terminal.
The liquefied gas shipping system of a ship, characterized in that the compander compression unit is axially connected to the compander expansion unit and compresses the boil-off gas by the expansion energy of the boil-off gas in the compander expansion unit. 제 1항에 있어서,
상기 선박이 운항하는 동안 상기 카고탱크 내 액화가스로부터 발생하는 증발가스를 상기 압력탱크에 저장해 두고,
상기 액화가스 터미널로부터 상기 선박으로 액화가스를 선적하는 동안 상기 압력탱크에 저장된 증발가스를 팽창시켜 매니폴드를 통해 상기 액화가스 터미널로 이송하면서,
상기 컴팬더 팽창부에서의 증발가스의 팽창에너지에 의해, 액화가스의 선적 시 상기 카고탱크에서 발생하는 증발가스를 압축하여 상기 액화가스 터미널로 이송하는 것을 특징으로 하는 선박의 액화가스 선적 시스템. The method of claim 1,
While the vessel is operating, the boil-off gas generated from the liquefied gas in the cargo tank is stored in the pressure tank,
While loading the liquefied gas from the liquefied gas terminal to the ship, the boil-off gas stored in the pressure tank is expanded and transferred to the liquefied gas terminal through the manifold,
The liquefied gas shipping system of a ship, characterized in that by the expansion energy of the boil-off gas in the compander expansion part, the boil-off gas generated in the cargo tank is compressed and transferred to the liquefied gas terminal when the liquefied gas is shipped. 제 2항에 있어서,
상기 압력탱크와 상기 컴팬더 팽창부 사이의 배관에 마련되어 상기 압력탱크에 저장된 증발가스를 일정한 압력으로 상기 컴팬더 팽창부로 공급하는 압력 조절 밸브를 더 포함하는 선박의 액화가스 선적 시스템. 3. The method of claim 2,
and a pressure regulating valve provided in a pipe between the pressure tank and the compander expansion unit to supply boil-off gas stored in the pressure tank to the compander expansion unit at a constant pressure. 제 3항에 있어서,
상기 압력탱크는 IMO C type 탱크로 마련되는 것을 특징으로 하는 선박의 액화가스 선적 시스템. 4. The method of claim 3,
The pressure tank is a liquefied gas shipping system of a ship, characterized in that provided as an IMO C type tank. 선외 액화가스 터미널로부터 액화가스를 이송하여 선박의 카고탱크에 선적하되,
상기 선박이 운항하는 동안 상기 카고탱크 내 액화가스로부터 발생하는 증발가스를 압력탱크에 저장해 두고,
상기 카고탱크로 액화가스가 선적될 때 상기 압력탱크에 저장된 증발가스를 컴팬더 팽창부로 보내 팽창시켜 상기 액화가스 터미널로 이송하면서,
상기 액화가스의 선적 시 상기 카고탱크에서 발생하는 증발가스를 상기 컴팬더 팽창부와 축으로 연결된 컴팬더 압축부에서 상기 증발가스의 팽창에너지에 의해 압축하여 상기 액화가스 터미널로 이송하는 것을 특징으로 하는 선박의 액화가스 선적 방법. The liquefied gas is transferred from the outboard liquefied gas terminal and loaded into the cargo tank of the ship,
While the vessel is operating, the boil-off gas generated from the liquefied gas in the cargo tank is stored in a pressure tank,
When the liquefied gas is shipped to the cargo tank, the boil-off gas stored in the pressure tank is sent to the compander expansion unit to expand and transfer to the liquefied gas terminal,
When the liquefied gas is shipped, the boil-off gas generated in the cargo tank is compressed by the expansion energy of the boil-off gas in a compander compression unit axially connected to the compander expansion unit and transferred to the liquefied gas terminal. How to ship liquefied gas on board. 제 5항에 있어서,
상기 압력탱크와 상기 컴팬더 팽창부 사이의 배관에 압력 조절 밸브를 마련하여, 상기 압력탱크에 저장된 증발가스를 일정한 압력으로 상기 컴팬더 팽창부로 공급하여 상기 액화가스 터미널로 이송하는 것을 특징으로 하는 선박의 액화가스 선적 방법.6. The method of claim 5,
A vessel, characterized in that by providing a pressure control valve in a pipe between the pressure tank and the compander expansion unit, the boil-off gas stored in the pressure tank is supplied to the compander expansion unit at a constant pressure and transferred to the liquefied gas terminal. of liquefied gas shipment method. 제 6항에 있어서,
상기 압력탱크는 IMO C type 탱크로 마련되는 것을 특징으로 하는 선박의 액화가스 선적 방법. 7. The method of claim 6,
The pressure tank is a liquefied gas shipping method of a ship, characterized in that provided as an IMO C type tank.
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