KR20120056415A - Rundown unit for cargo tank and liquefied gas plant having the same - Google Patents

Rundown unit for cargo tank and liquefied gas plant having the same Download PDF

Info

Publication number
KR20120056415A
KR20120056415A KR1020100117937A KR20100117937A KR20120056415A KR 20120056415 A KR20120056415 A KR 20120056415A KR 1020100117937 A KR1020100117937 A KR 1020100117937A KR 20100117937 A KR20100117937 A KR 20100117937A KR 20120056415 A KR20120056415 A KR 20120056415A
Authority
KR
South Korea
Prior art keywords
liquefied gas
cargo tank
flash drum
back pressure
cargo
Prior art date
Application number
KR1020100117937A
Other languages
Korean (ko)
Inventor
김준홍
이미현
박미영
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 KR1020100117937A priority Critical patent/KR20120056415A/en
Publication of KR20120056415A publication Critical patent/KR20120056415A/en

Links

Images

Classifications

    • 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
    • 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
    • B63B27/25—Arrangement of ship-based loading or unloading equipment for cargo or passengers of pipe-lines for fluidised bulk material
    • 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
    • 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/20—Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing 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
    • 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
    • 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
    • F17C2205/0352—Pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PURPOSE: A lower transferring unit for a cargo tank and a liquefied gas plant having the same are provided to precisely adjust flow rates supplied to a cargo tank and to reduce costs for installation and maintenance because a separate evaporative gas removing device is not necessary. CONSTITUTION: A lower transferring unit(20) for a cargo tank(1) comprises a lower transferring line(21), a lower transferring manifold(22), distribution pipes(23), and negative pressure adjusting valves(31). The lower transferring line is extended from a flash drum. The lower transferring manifold is installed on the lower transferring line. The distribution pipes are branched from the lower transferring manifold to be connected with a cargo tank. The negative pressure adjusting valves are individually installed on the distribution pipes. The lower transferring line is connected to the lower end of the flash drum.

Description

카고탱크용 하부이송 유닛 및 이를 포함하는 액화가스 플랜트{RUNDOWN UNIT FOR CARGO TANK AND LIQUEFIED GAS PLANT HAVING THE SAME}RUNDOWN UNIT FOR CARGO TANK AND LIQUEFIED GAS PLANT HAVING THE SAME}

본 발명은 액화가스를 저장하는 카고탱크에 관한 것으로, 보다 상세하게는 액화가스를 카고탱크로 이송하는 도중에 하부이송 라인(rundown line) 내에서 발생하는 배압(back pressure)을 적절히 조절함으로써 하부이송 매니폴드 내에서 증발가스 발생을 원천적으로 차단할 수 있는 카고탱크용 하부이송 유닛 및 이를 포함하는 액화가스 플랜트에 관한 것이다. The present invention relates to a cargo tank for storing liquefied gas, and more particularly, a lower transfer manifold by appropriately adjusting back pressure generated in a rundown line during the transfer of liquefied gas to a cargo tank. The present invention relates to a lower transfer unit for a cargo tank and a liquefied gas plant including the same, capable of blocking the generation of boil-off gas in the fold.

천연가스는 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 액화된 액화천연가스(LNG) 또는 액화석유가스(LPG) 등과 같은 액화가스 상태로 LNG 수송선에 저장된 채 원거리의 소비처로 운반된다. 액화천연가스는 천연가스를 극저온(대략 -163)으로 냉각하여 얻어지는 것으로 가스 상태의 천연가스일 때보다 그 부피가 대략 1/600로 줄어들므로 해상을 통한 원거리 운반에 매우 적합하다.Natural gas is transported in gaseous form through onshore or offshore gas pipelines, or liquefied gaseous state such as liquefied liquefied natural gas (LNG) or liquefied petroleum gas (LPG), which is stored in LNG carriers to remote consumers. Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (approximately -163), and its volume is reduced to about 1/600 than that of natural gas in gas state, so it is very suitable for long distance transportation by sea.

이러한 LNG를 저장하거나 이송하기 위한 선박 혹은 해양 구조물에는 LNG 수송선(LNG CARRIER), LNG RV(Regasification Vessel), LNG FPSO(Floating, Production, Storage and Offloading), LNG FSRU(Floating Storage and Regasification Unit), F(Floating)-LNG 플랜트 등이 있다.Ships or offshore structures for storing or transporting such LNG include LNG Carriers, LNG Regasification Vessels, LNG Floating, Production, Storage and Offloading, LNG Floating Storage and Regasification Units, and FFSRUs. Floating-LNG plants.

한편, LNG, LPG 등과 같은 액화가스는 생산설비에 의해 생산된 후에 플래시 드럼에서 저장에 적당한 압력으로 감압됨과 더불어 불필요한 가스성분이 제거된 후에 하부이송 라인(rundown line)을 거쳐 복수의 카고탱크로 공급되어 저장된다.On the other hand, liquefied gas such as LNG and LPG is reduced by a pressure suitable for storage in a flash drum after being produced by a production facility, and after unnecessary gas components are removed, it is supplied to a plurality of cargo tanks through a rundown line. And stored.

하지만, 플래쉬 드럼을 거쳐 이송되는 액화가스는 하부이송 라인 상에서 압력 강하(pressure drop)가 발생하고, 이를 통해 액화가스에서 증발가스(vapor)가 발생하고, 이렇게 발생된 증발가스로 인해 액화가스의 유량을 적절히 조절하지 못하는 단점이 있었다.However, the liquefied gas transported through the flash drum has a pressure drop on the lower conveying line, thereby generating a vapor from the liquefied gas, and the flow rate of the liquefied gas due to the generated evaporated gas. There was a disadvantage that can not be properly adjusted.

또한, 하부이송 라인 상에서 발생한 증발가스를 제거하기 위한 증발가스 제거수단이 요구되어 액화가스의 하부이송 유닛이 복잡하게 구성되어 그 설치비용 및 유지관리 비용이 증대되는 단점이 있었다. In addition, the boil-off gas removal means for removing the boil-off gas generated on the lower feed line is required, the lower feed unit of the liquefied gas has a disadvantage that the installation cost and maintenance costs are increased.

본 발명은 상기와 같은 점을 감안하여 안출한 것으로, 액화가스를 카고탱크로 이송하는 도중에 배압(back pressure)을 적절히 조절함으로써 하부이송 매니폴드 내에서 증발가스 발생을 원천적으로 차단할 수 있는 카고탱크용 하부이송 유닛 및 이를 포함하는 액화가스 플랜트를 제공하는 데 그 목적이 있다. The present invention has been made in view of the above point, the cargo tank for cargo tank which can block the generation of boil-off gas in the lower transfer manifold by properly adjusting the back pressure during the transfer of the liquefied gas to the cargo tank The object is to provide a bottom conveying unit and a liquefied gas plant comprising the same.

상기와 같은 목적을 달성하기 위한 본 발명의 일 측면은 플래시 드럼으로부터 분리된 액화가스를 복수의 카고탱크측으로 이송하는 카고탱크용 하부이송 유닛으로, 플래시 드럼에서 연장된 하부이송 라인(rundown line); 상기 하부이송 라인 상에 설치된 하부이송 매니폴드(rundown manifold); 상기 하부이송 매니폴드(rundown manifold)에서 분기되어 복수의 카고탱크에 연결되는 복수의 분배배관; 및 각 분배배관 상에 개별적으로 설치된 복수의 배압조절밸브;를 포함하는 것을 특징으로 한다.One aspect of the present invention for achieving the above object is a lower transfer unit for a cargo tank for transferring the liquefied gas separated from the flash drum to a plurality of cargo tank side, a lower feed line (rundown line) extending from the flash drum; A rundown manifold installed on the bottom transfer line; A plurality of distribution pipes branched from the rundown manifold and connected to a plurality of cargo tanks; And a plurality of back pressure control valves individually installed on each distribution pipe.

상기 하부이송 라인은 상기 플래시 드럼의 하단측에 연결되는 것을 특징으로 한다.The lower transfer line is characterized in that connected to the lower side of the flash drum.

상기 하부이송 라인은 복수의 카고탱크 상측에 위치하여 액화가스를 자유낙하식으로 각 카고탱크로 공급하는 것을 특징으로 한다.The lower transfer line is located above the plurality of cargo tanks, characterized in that for supplying liquefied gas to each cargo tank in a free-falling manner.

상기 각 분배배관 상에는 배압조절밸브 및 개폐밸브가 일렬로 설치되는 것을 특징으로 한다.Each of the distribution pipe is characterized in that the back pressure control valve and the on-off valve is installed in a line.

본 발명의 다른 측면은 액화가스를 생산하여 복수의 카고탱크 내에 저장하는 액화가스 플랜트로서, 액화가스를 생산하는 액화장치; 상기 액화장치에서 생상된 액화가스에서 증발가스를 분리하는 플래시 드럼; 및 상기 플래시 드럼로부터 액화가스를 복수의 카고탱크로 이송하는 하부이송 유닛;을 포함하고, 상기 플래시 드럼에서 분리된 플래시 가스는 리턴배관을 통해 액화장치로 리턴되며, 상기 하부이송 유닛은 액화가스가 이송되는 도중에 발생하는 배압을 조절하는 배압조절밸브를 가지는 것을 특징으로 한다.Another aspect of the present invention is a liquefied gas plant for producing liquefied gas and storing in a plurality of cargo tanks, liquefied gas for producing liquefied gas; A flash drum separating the evaporated gas from the liquefied gas produced by the liquefaction apparatus; And a lower transfer unit configured to transfer the liquefied gas from the flash drum to a plurality of cargo tanks, wherein the flash gas separated from the flash drum is returned to the liquefaction apparatus through a return pipe. It characterized in that it has a back pressure control valve for adjusting the back pressure generated during the transfer.

상기 하부이송 유닛은 상기 플래시 드럼에서 연장된 하부이송 라인(rundown line), 상기 하부이송 라인 상에 설치된 하부이송 매니폴드(rundown manifold), 상기 하부이송 매니폴드(rundown manifold)에서 분기되어 복수의 카고탱크에 연결되는 복수의 분배배관, 및 각 분배배관 상에 개별적으로 설치된 복수의 배압조절밸브를 포함하는 것을 특징으로 한다.The lower conveying unit is a plurality of cargo branched from the rundown line extending from the flash drum, a rundown manifold installed on the lower conveying line, the rundown manifold It characterized in that it comprises a plurality of distribution pipes connected to the tank, and a plurality of back pressure control valves individually installed on each distribution pipe.

상기 하부이송 라인은 복수의 카고탱크 상측에 위치하여 액화가스를 자유낙하식으로 각 카고탱크로 공급하는 것을 특징으로 한다.The lower transfer line is located above the plurality of cargo tanks, characterized in that for supplying liquefied gas to each cargo tank in a free-falling manner.

상기 각 분배배관 상에는 배압조절밸브 및 개폐밸브가 일렬로 설치되는 것을 특징으로 한다.Each of the distribution pipe is characterized in that the back pressure control valve and the on-off valve is installed in a line.

이상과 같은 본 발명에 의하면, 액화가스가 각 분배배관을 통해 카고탱크로 이송되는 도중에 배압조절밸브에 의해 그 배압을 조절함으로써 하부이송 라인, 하부이송 매니폴드 등에서 증발가스(vapor)의 발생을 원천적으로 차단할 수 있고, 이를 통해 카고탱크로 공급하는 유량을 보다 정밀하게 조절할 뿐만 아니라 별도의 증발가스 제거수단이 필요없어 그 설치비용 및 유지관리비용을 절감할 수 있는 장점이 있다.According to the present invention as described above, by the back pressure control valve while the liquefied gas is transferred to the cargo tank through each distribution pipe by adjusting the back pressure, the generation of vapor in the lower feed line, lower feed manifold, etc. It can be blocked, through which the flow rate to be supplied to the cargo tank more precisely adjusted, there is no need for a separate evaporation gas removal means there is an advantage that can reduce the installation cost and maintenance costs.

도 1은 본 발명의 일 실시예에 따른 카고탱크용 하부이송 유닛 및 이를 포함하는 액화가스 플랜트를 도시한 구성도이다.1 is a block diagram showing a lower tank transport unit and a liquefied gas plant including the same according to an embodiment of the present invention.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1에 도시된 바와 같이, 본 발명에 의한 액화가스 플랜트(100)는 천연가스 또는 석유가스 등을 액화시키는 액화장치(11), 액화장치(11)에 의해 생산된 액화가스를 기액분리하여 증발가스를 외부로 배출하는 플래시 드럼(12, flash drum), 플래시 드럼(12)으로부터 액화가스를 복수의 카고탱크(1)로 이송하는 하부이송 유닛(rundown unit)을 포함한다.As shown in FIG. 1, the liquefied gas plant 100 according to the present invention is evaporated by gas-liquid separation of the liquefied gas 11 produced by the liquefied device 11 and the liquefied device 11 to liquefy natural gas or petroleum gas. Flash drum 12 for discharging the gas to the outside, and a rundown unit (rundown unit) for transferring the liquefied gas from the flash drum 12 to the plurality of cargo tank (1).

액화장치(11)는 가스를 액화시키기 위한 열교환기 등을 구비하고, 액화장치(11)에 의해 생산된 액화가스는 공급라인(14)을 통해 플래시 드럼(12)으로 공급된다.The liquefaction apparatus 11 is equipped with the heat exchanger etc. for liquefying gas, and the liquefied gas produced by the liquefaction apparatus 11 is supplied to the flash drum 12 via the supply line 14.

플래스 드럼(12)의 상단에는 기액분리에 의해 분리된 플래시 가스를 액화장치(11)측으로 리턴시키는 리턴배관(13)이 설치되고, 플래시 드럼(12)의 하단에는 기액분리에 의해 분리된 액화가스를 복수의 카고탱크(1)로 이송하는 하부이송 유닛(20)이 연결된다. A return pipe 13 for returning the flash gas separated by gas-liquid separation to the liquefaction apparatus 11 side is installed at the upper end of the flash drum 12, and at the lower end of the flash drum 12, the liquefaction separated by gas-liquid separation. The lower transfer unit 20 for transferring the gas to the plurality of cargo tanks 1 is connected.

일 실시예에 따른 하부이송 유닛(20)은 복수의 카고탱크(1)들의 상측에 배치되어 액화가스를 자유낙하식으로 이송하도록 구성된다. The lower transfer unit 20 according to an embodiment is disposed above the plurality of cargo tanks 1 and configured to transfer the liquefied gas in a free-falling manner.

하부이송 유닛(20)은, 플래시 드럼(12)의 하단에 연결된 하부이송 라인(21, rundown line)과, 이 하부이송 라인(21)측에 연결된 하부이송 매니폴드(22, rundown manifold)와, 이 하부이송 매니폴드(22)에서 분기되어 복수의 카고탱크(1)측으로 개별적으로 연결된 복수의 분배배관(23)으로 구성된다.The lower transfer unit 20 includes a rundown line 21 connected to the lower end of the flash drum 12, a rundown manifold 22 connected to the lower transfer line 21 side, It consists of a plurality of distribution pipes 23 branched from the lower feed manifold 22 and individually connected to the plurality of cargo tanks 1 side.

한편, 하부이송 유닛(20)의 하부이송 라인(21), 하부이송 매니폴드(22), 분배배관(23)을 통해 액화가스가 각 카고탱크(1)로 이송되는 도중에, 압력 강하(pressure drop)가 필연적으로 발생하며, 이러한 압력 강하로 인해 증발가스(vapor)가 발생할 수 있다.On the other hand, the pressure drop during the transfer of the liquefied gas to each cargo tank 1 through the lower conveying line 21, lower conveying manifold 22, distribution pipe 23 of the lower conveying unit 20, pressure drop (pressure drop) ) Inevitably occurs, and this pressure drop may cause evaporation (vapor).

이에, 본 발명은 각 분배배관(23)에 배압(back pressure)을 적절히 조절하는 배압조절밸브(31)를 설치함으로써 압력강하로 인한 증발가스의 발생을 효과적으로 차단할 수 있다. 특히, 배압조절밸브(31)는 기포(bubble)가 발생하지 않을 정도로 미세하게 개방정도를 조절함으로써 그 배압을 적절히 조절할 수 있다.Accordingly, the present invention can effectively block the generation of the boil-off gas due to the pressure drop by providing a back pressure control valve 31 for properly adjusting the back pressure (back pressure) in each distribution pipe (23). In particular, the back pressure regulating valve 31 can appropriately adjust the back pressure by adjusting the opening degree so fine that bubbles do not occur.

이와 같이, 본 발명은 배압조절밸브(31)에 의한 배압조절을 통해 액화가스의 공급유량을 보다 정밀하게 조절할 수 있을 뿐만 아니라 종래기술과 같은 별도의 증발가스 제거수단을 설치할 필요가 없어 그 설치비용 및 유지관리비용이 대폭 절감될 수 있는 장점이 있다.As such, the present invention not only can more precisely adjust the supply flow rate of the liquefied gas through the back pressure control by the back pressure control valve 31, but also does not need to install a separate evaporation gas removing means as in the prior art, the installation cost And maintenance costs can be significantly reduced.

그리고, 각 분배배관(23)에는 액화가스의 공급을 선택적으로 조절하는 개폐밸브(32)가 배압조절밸브(31)측에 일렬로 설치될 수 있다.In addition, each distribution pipe 23 may be provided in a row on the back pressure control valve 31 to the on-off valve 32 to selectively control the supply of liquefied gas.

따라서, 개폐밸브(32)를 통해서는 해당 카고탱크에 LNG(혹은 LPG)를 공급할 것인지가 결정되고, 배압조절밸브(31)를 통해서는 LNG(혹은 LPG)의 공급속도를 조절하여 배압을 조절함으로써 증발가스의 발생을 억제할 수 있다.Therefore, it is determined whether to supply LNG (or LPG) to the cargo tank through the opening and closing valve 32, and by adjusting the back pressure by adjusting the supply speed of LNG (or LPG) through the back pressure control valve 31 The generation of boil-off gas can be suppressed.

도 1에서는 본 발명에 따른 카고탱크용 하부이송 유닛이 액화장치(11)로부터 LNG나 LPG 등의 액화가스를 공급받는 것으로 도시되어 있지만, 이는 예시일 뿐이며, 액화장치 이외에도 액화가스를 수송하는 액화가스 수송선으로부터 액화가스를 공급받는 경우에도 본 발명이 적용될 수 있음은 물론이다.In FIG. 1, the lower transfer unit for the cargo tank according to the present invention is shown to receive liquefied gas such as LNG or LPG from the liquefaction apparatus 11, but this is only an example, and liquefied gas for transporting liquefied gas in addition to the liquefied apparatus. Of course, the present invention can be applied to the case of receiving the liquefied gas from the transport ship.

즉, LNG 수송선으로부터 LNG FSRU의 카고탱크에 LNG를 공급하는 경우나, LNG FPSO로부터 LNG 수송선의 카고탱크에 LNG를 공급하는 경우 등에도 본 발명이 적용될 수 있다.That is, the present invention can also be applied to supplying LNG to a cargo tank of an LNG FSRU from an LNG transporter, or supplying LNG to a cargo tank of an LNG transporter from an LNG FPSO.

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 자에 있어서 자명한 것이다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

1: 카고탱크 11: 액화장치
12: 플래시 드럼 13: 리턴배관
20: 하부이송 유닛 21: 하부이송 라인
22: 하부이송 매니폴드 23: 분배배관
31: 배압조절밸브 32: 개폐밸브1: cargo tank 11: liquefaction equipment
12: flash drum 13: return piping
20: lower feed unit 21: lower feed line
22: lower feed manifold 23: distribution piping
31: back pressure control valve 32: on-off valve

Claims (8)

플래시 드럼으로부터 분리된 액화가스를 카고탱크측으로 이송하는 카고탱크용 하부이송 유닛으로서,
플래시 드럼에서 연장된 하부이송 라인(rundown line);
상기 하부이송 라인 상에 설치된 하부이송 매니폴드(rundown manifold);
상기 하부이송 매니폴드(rundown manifold)에서 분기되어 카고탱크에 연결되는 분배배관; 및
상기 분배배관 상에 개별적으로 설치된 배압조절밸브; 를 포함하는 것을 특징으로 하는 카고탱크용 하부이송 유닛.A lower transfer unit for a cargo tank for transferring liquefied gas separated from a flash drum to a cargo tank side,
A rundown line extending from the flash drum;
A rundown manifold installed on the bottom transfer line;
A distribution pipe branched from the lower feed manifold and connected to a cargo tank; And
A back pressure control valve separately installed on the distribution pipe; Cargo tank lower transfer unit comprising a. 청구항 1에 있어서,
상기 하부이송 라인은 상기 플래시 드럼의 하단측에 연결되는 것을 특징으로 하는 카고탱크용 하부이송 유닛.The method according to claim 1,
The lower conveying line is a lower conveying unit for a cargo tank, characterized in that connected to the lower side of the flash drum. 청구항 1에 있어서,
상기 하부이송 라인은 복수의 카고탱크 상측에 위치하여 액화가스를 자유낙하식으로 각 카고탱크로 공급하는 것을 특징으로 하는 카고탱크용 하부이송 유닛.The method according to claim 1,
The lower transfer line is located above the plurality of cargo tanks, the lower transfer unit for cargo tanks, characterized in that to supply liquefied gas to each cargo tank in a free-falling manner. 청구항 1에 있어서,
상기 각 분배배관 상에는 배압조절밸브 및 개폐밸브가 일렬로 설치되는 것을 특징으로 하는 카고탱크용 하부이송 유닛.The method according to claim 1,
A lower transfer unit for cargo tank, characterized in that the back pressure control valve and the on-off valve is installed in a row on each distribution pipe. 액화가스를 생산하여 복수의 카고탱크 내에 저장하는 액화가스 플랜트로서,
액화가스를 생산하는 액화장치;
상기 액화장치에서 생상된 액화가스에서 증발가스를 분리하는 플래시 드럼; 및
상기 플래시 드럼로부터 액화가스를 복수의 카고탱크로 이송하는 하부이송 유닛; 을 포함하고,
상기 플래시 드럼에서 분리된 플래시 가스는 리턴배관을 통해 액화장치로 리턴되며, 상기 하부이송 유닛은 액화가스가 이송되는 도중에 발생하는 배압을 조절하는 배압조절밸브를 가지는 것을 특징으로 하는 액화가스 플랜트.A liquefied gas plant that produces liquefied gas and stores it in a plurality of cargo tanks,
Liquefaction apparatus for producing liquefied gas;
A flash drum separating the evaporated gas from the liquefied gas produced by the liquefaction apparatus; And
A lower transfer unit for transferring liquefied gas from the flash drum to a plurality of cargo tanks; Including,
The flash gas separated from the flash drum is returned to the liquefaction apparatus through a return pipe, the lower conveying unit is a liquefied gas plant, characterized in that having a back pressure control valve for adjusting the back pressure generated during the transfer of the liquefied gas. 청구항 5에 있어서,
상기 하부이송 유닛은, 상기 플래시 드럼에서 연장된 하부이송 라인(rundown line), 상기 하부이송 라인 상에 설치된 하부이송 매니폴드(rundown manifold), 상기 하부이송 매니폴드(rundown manifold)에서 분기되어 복수의 카고탱크에 연결되는 복수의 분배배관, 및 각 분배배관 상에 개별적으로 설치된 복수의 배압조절밸브를 포함하는 것을 특징으로 하는 액화가스 플랜트.The method according to claim 5,
The lower conveying unit includes a rundown line extending from the flash drum, a lower feed manifold installed on the lower conveying line, branched from the lower conveying manifold, and a plurality of lower conveying lines. A liquefied gas plant comprising a plurality of distribution pipes connected to the cargo tank, and a plurality of back pressure control valves individually installed on each distribution pipe. 청구항 5에 있어서,
상기 하부이송 라인은 복수의 카고탱크 상측에 위치하여 액화가스를 자유낙하식으로 각 카고탱크로 공급하는 것을 특징으로 하는 액화가스 플랜트.The method according to claim 5,
The lower transfer line is located above the plurality of cargo tanks liquefied gas plant, characterized in that for supplying liquefied gas to each cargo tank in a free-falling manner. 청구항 5에 있어서,
상기 각 분배배관 상에는 배압조절밸브 및 개폐밸브가 일렬로 설치되는 것을 특징으로 하는 액화가스 플랜트.The method according to claim 5,
A liquefied gas plant, characterized in that the back pressure control valve and the on-off valve is installed in a row on each distribution pipe.
KR1020100117937A 2010-11-25 2010-11-25 Rundown unit for cargo tank and liquefied gas plant having the same KR20120056415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100117937A KR20120056415A (en) 2010-11-25 2010-11-25 Rundown unit for cargo tank and liquefied gas plant having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100117937A KR20120056415A (en) 2010-11-25 2010-11-25 Rundown unit for cargo tank and liquefied gas plant having the same

Publications (1)

Publication Number Publication Date
KR20120056415A true KR20120056415A (en) 2012-06-04

Family

ID=46608562

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100117937A KR20120056415A (en) 2010-11-25 2010-11-25 Rundown unit for cargo tank and liquefied gas plant having the same

Country Status (1)

Country Link
KR (1) KR20120056415A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150072605A (en) * 2013-12-20 2015-06-30 대우조선해양 주식회사 Cool down system and method of cargo tank in offshore structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150072605A (en) * 2013-12-20 2015-06-30 대우조선해양 주식회사 Cool down system and method of cargo tank in offshore structure

Similar Documents

Publication Publication Date Title
RU2446981C1 (en) Liquefied-gas carrier with gas loading and unloading system
US10584830B2 (en) Apparatus, system and method for the capture, utilization and sendout of latent heat in boil off gas onboard a cryogenic storage vessel
US9810478B2 (en) Floating liquefied natural gas commissioning system and method
US20110277497A1 (en) Method and apparatus for processing hydrocarbon liquefied gas
KR20090107805A (en) Method and system for reducing heating value of natural gas
KR20200022869A (en) Fuel Supplying System And Method For Ship Using Liquefied Gas
KR101525679B1 (en) A Liquefied Gas Treatment System
KR101599312B1 (en) Liquefied natural gas regasification apparatus
KR101788744B1 (en) Vaporization type unloading apparatus and method for low temperature liquefied gas carriage ship
KR20160036838A (en) LNG Bunkering System And Method For Ship
KR20120003894U (en) Venting apparatus for cargo tanks
JP2016536209A (en) System and method for preventing liquid cargo evaporation on a ship
KR20120056415A (en) Rundown unit for cargo tank and liquefied gas plant having the same
KR20160091785A (en) Lng-fpso
KR101775041B1 (en) Floating Storage Unit
KR101701719B1 (en) Reliquefaction system
KR20130036403A (en) Appartus for controlling and managing the level of tank for floating unit
KR20120027790A (en) Floating mooring apparatus and method for unloading liguefied natural gas using the same
KR102262123B1 (en) Transportation system for Liquefied Natural Gas
KR20160054747A (en) Plant And Method For LNG Regasification
KR102120559B1 (en) Regasification System of Gas and Ship having the Same
KR102645626B1 (en) Shipping method of liquefied natural gas
KR20120058263A (en) Fuel gas supply system and reliquefied method for boil off gas
KR102215060B1 (en) BOG re-condenser and method for control of that
KR102269042B1 (en) Gas treatment test system and offshore plant having the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application