KR20060083727A - Operating system for sub-cooled liquefaction boil-off gas of lng ship - Google Patents

Operating system for sub-cooled liquefaction boil-off gas of lng ship Download PDF

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Publication number
KR20060083727A
KR20060083727A KR1020050004650A KR20050004650A KR20060083727A KR 20060083727 A KR20060083727 A KR 20060083727A KR 1020050004650 A KR1020050004650 A KR 1020050004650A KR 20050004650 A KR20050004650 A KR 20050004650A KR 20060083727 A KR20060083727 A KR 20060083727A
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South Korea
Prior art keywords
liquid separator
gas
pressure
engine
engine liquid
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KR1020050004650A
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Korean (ko)
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KR100638924B1 (en
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유진열
김현진
박현기
김남수
안형수
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대우조선해양 주식회사
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Priority to KR1020050004650A priority Critical patent/KR100638924B1/en
Priority to US11/184,282 priority patent/US20060156758A1/en
Priority to JP2005209561A priority patent/JP2006200735A/en
Priority to FR0508023A priority patent/FR2880942B1/en
Priority to PCT/KR2006/000086 priority patent/WO2006078104A1/en
Publication of KR20060083727A publication Critical patent/KR20060083727A/en
Application granted granted Critical
Publication of KR100638924B1 publication Critical patent/KR100638924B1/en
Priority to US12/001,146 priority patent/US20080120993A1/en
Priority to US12/688,411 priority patent/US8256230B2/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 
    • 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
    • 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
    • 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
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return 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
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, 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
    • 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
    • F17C2265/035—Treating the boil-off by recovery with cooling with subcooling the liquid phase
    • 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

Abstract

본 발명은 엘엔지선의 증발가스 과냉액화 운전시스템에 관한 것이다.The present invention relates to an evaporation gas subcooled operation system of the L-engine ship.

본 발명은 증발가스콤프레셔(10), 냉각시스템(40)과 연결된 초저온용열교환기(20), 엘엔지기액분리기(30)와 가스연소유닛(70)의 배관라인상에 구성된 역흐름방지밸브(50) 및 압력조절밸브(60) 등을 포함하는 엘엔지선의 증발가스 재액화를 위한 과냉액화 운전시스템에 있어서, 상기 엘엔지기액분리기(30)와 역흐름방지밸브(50) 사이의 배관라인에 역흐름방지밸브(50) 및 압력조절밸브(60) 설치구조와 같은 또 다른 병렬형태의 배관라인을 구성하여 상기 배관라인에 비이상적인 압력상승으로 인한 역흐름 방지용 역흐름방지밸브(50') 및 과냉조건으로 운전되는 엘엔지기액분리기(30)의 안정된 운전을 위해 상기 증발가스콤프레셔(10)로부터 증발가스 유량을 조절해줌으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 하기 위한 압력조절밸브(60')를 설치하되, 상기 배관라인의 다른쪽을 증발가스콤프레셔(10)와 초저온용열교환기(20) 사이의 배관라인과 연결하여 과냉액화 운전 시 엘엔지기액분리기(30)의 안정적인 운전 압력 및 수위 제어를 위해 상기 엘엔지기액분리기(30) 상부 증기영역에 블랭킷 목적으로 증발가스콤프레셔(10)로부터 배출된 증발가스가 공급될 수 있도록 함으로서 엘엔지기액분리기(30)의 압력 및 수위제어가 안정된 상태로 운전될 수 있도록 하는 것을 특징으로 한다.The present invention is a reverse flow prevention valve (50) configured on the piping line of the evaporative gas compressor (10), the cryogenic heat exchanger (20) connected to the cooling system (40), the L-engine liquid separator (30) and the gas combustion unit (70). In the super-cooled liquefaction operation system for the re-liquefaction of the L-engine vessel, including the pressure control valve (60) and the like, the reverse flow prevention in the piping line between the L-engine liquid separator 30 and the reverse flow prevention valve (50) Another parallel type pipe line, such as the valve 50 and pressure control valve 60 installation structure, is formed to prevent reverse flow due to non-ideal pressure rise in the pipe line. Pressure regulating valve (60 ') for maintaining a constant pressure of the L-engine liquid separator 30 by adjusting the evaporation gas flow rate from the boil-off gas compressor (10) for the stable operation of the operated L-engine liquid separator (30) Install) The other side of the pipe line is connected to the pipe line between the boil-off gas compressor 10 and the cryogenic heat exchanger 20 to control the stable operation pressure and the water level of the L-engine liquid separator 30 during the supercooling operation. By allowing the boil-off gas discharged from the boil-off gas compressor 10 to be supplied to the upper steam region of the L-engine liquid separator 30 so that the pressure and water level control of the L-engine liquid separator 30 can be operated in a stable state. It is characterized by.

본 발명은 엘엔지선의 증발가스 재액화시스템을 효율적인 과냉액화 구조로 개량 적용함으로서 엘엔지 리턴라인에서의 이상(Two-phase)영역 과다발생에 의한 추가 증발가스 발생 압력손실 증대에 따른 전력소모량을 효과적으로 줄일수 있을 뿐만 아니라 과냉액화 운전시 엘엔지기액분리기의 증기영역에 증발가스콤프레셔로부터 배출된 증발가스를 블랭킷 목적으로 공급하여 줌으로써 엘엔지기액분리기의 안정된 운전압력과 수위제어에 의한 운전단순화로 인해 경제적인 이점이 있는 매우 유용한 발명이다.The present invention can effectively reduce the power consumption due to the increase in the pressure loss caused by the additional evaporation gas caused by the excessive occurrence of two-phase zone in the LENG return line by applying the evaporation gas reliquefaction system of the L ENG line to an efficient supercooled liquefaction structure. In addition, by supplying the evaporated gas discharged from the boil-off gas compressor to the vapor zone of the L-engine liquid separator during the supercooling liquid operation for the purpose of the blanket, there is an economic advantage due to the stable operation pressure of the L-engine liquid separator and the simplification by the water level control It is a very useful invention.

Description

엘엔지선의 증발가스 과냉액화 운전시스템{Operating system for sub-cooled liquefaction boil-off gas of LNG ship}Operating system for sub-cooled liquefaction boil-off gas of LNG ship

도 1은 본 발명 운전시스템의 개략적인 전체구성도1 is a schematic overall configuration diagram of the operation system of the present invention

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : 증발가스콤프레셔 20 : 초저온용열교환기10: boil-off gas compressor 20: cryogenic heat exchanger

30 : 엘엔지기액분리기 40 : 냉각시스템30: L-engine liquid separator 40: cooling system

50,50' : 역흐름방지밸브 60,60' : 압력조절밸브50,50 ': Reverse flow prevention valve 60,60': Pressure regulating valve

70 : 가스연소유닛 80 : 레벨콘트롤밸브70: gas combustion unit 80: level control valve

본 발명은 엘엔지선의 증발가스 과냉액화 운전시스템에 관한 것이다.The present invention relates to an evaporation gas subcooled operation system of the L-engine ship.

본 발명은 엘엔지선의 증발가스(Boil-off Gas) 재액화시스템(Re-liquefaction System)을 효율적인 과냉액화(Sub-cooled Liquefaction) 구조로 개량 적용함으로서 전력소모량(Electric Consumption) 절감은 물론 운전단순화(Operating Simplification)로 인한 경제성을 확보할 수 있도록 한 것이다.The present invention is improved by applying the Boil-off Gas re-liquefaction system of the L-engine ship to an efficient sub-cooled Liquefaction structure to reduce the electricity consumption (Operating) as well as operating simplification (Operating) The economic feasibility of Simplification has been secured.

일반적으로 엘엔지선의 콤프레셔/모터룸에 설치되어 있는 재액화시스템(Re-liquefaction System)을 이용하여 카고탱크로부터 발생되는 증발가스를 액화 LNG 형태로 재액화(Re-liquefaction) 시켜서 카고탱크로 다시 되돌려 보내게 된다. Generally, the re-liquefaction system installed in the compressor / motor room of the L & G vessel is used to re-liquefaction the liquefied gas from the cargo tank into liquefied LNG and send it back to the cargo tank. It becomes.

이러한 재액화시스템의 기본운전방법에는 부분액화(Partial Liquefaction), 포화액화(Saturated Liquefaction), 과냉액화 등의 여러 방법이 있으나 그 중, 본 발명은 운전방법이 전력소모량, 운전단순화, 등의 측면에서 다른 운전방법에 비해 우수한 것으로 알려진 상기 과냉액화 운전방법을 더욱 효율적인 구조로 개량 적용하고 있는 것이다. The basic operation method of such a reliquefaction system has a number of methods such as partial liquefaction, saturated liquefaction, subcooled liquefaction, etc. Among them, the present invention is characterized in that the operation method in terms of power consumption, operation simplicity, etc. The supercooled liquefaction operation method, which is known to be superior to other operation methods, is being improved and applied.

본 발명은 엘엔지선의 증발가스 재액화시스템을 효율적인 과냉액화 구조로 개량 적용함으로서 전력소모량 절감은 물론 운전단순화로 인한 경제성을 확보할 수 있도록 함을 목적으로 한다. An object of the present invention is to reduce the power consumption as well as to ensure economic efficiency due to the simplicity of operation by reforming and applying the evaporation gas reliquefaction system of the L-engine ship to an efficient supercooled liquefaction structure.

이를 위해 본 발명은 증발가스콤프레셔, 냉각시스템과 연결된 초저온용열교환기, 엘엔지기액분리기와 가스연소유닛의 배관라인상에 구성된 역흐름방지밸브 및 압력조절밸브 등을 포함하는 엘엔지선의 증발가스 재액화를 위한 과냉액화 운전시스템에 있어서, 상기 엘엔지기액분리기와 역흐름방지밸브 사이의 배관라인에 역흐름방지밸브 및 압력조절밸브 설치구조와 같은 또 다른 병렬형태의 배관라인을 구성하여 상기 배관라인에 비이상적인 압력상승으로 인한 역흐름 방지용 역흐름방지밸브 및 과냉조건으로 운전되는 엘엔지기액분리기의 안정된 운전을 위해 상기 증발가스콤프레셔로부터 증발가스 유량을 조절해줌으로써 엘엔지기액분리기의 일정 압력 이 유지될 수 있도록 하기 위한 압력조절밸브를 설치하되, 상기 배관라인의 다른쪽을 증발가스콤프레셔와 초저온용열교환기 사이의 배관라인과 연결하여 과냉액화 운전 시 엘엔지기액분리기의 안정적인 운전 압력 및 수위 제어를 위해 상기 엘엔지기액분리기 상부 증기영역에 블랭킷 목적으로 증발가스콤프레셔로부터 배출된 증발가스가 공급될 수 있도록 함으로서 엘엔지기액분리기의 압력 및 수위제어가 안정된 상태로 운전될 수 있도록 하는 것을 특징으로 하는 엘엔지선의 증발가스 과냉액화 운전시스템을 제공함으로서 상기 목적을 달성하고자 한다.To this end, the present invention provides an evaporative gas reliquefaction of an LNG vessel including an evaporative gas compressor, a cryogenic heat exchanger connected to a cooling system, an L engine liquid separator, and a reverse flow prevention valve and a pressure control valve configured on a piping line of a gas combustion unit. In the supercooled liquefaction operation system for the above, another parallel type pipe line such as a reverse flow prevention valve and a pressure control valve installation structure is formed in the pipe line between the L-engine liquid separator and the reverse flow prevention valve, which is not ideal for the pipe line. In order to maintain a constant pressure of the EL engine liquid separator by regulating the flow rate of the e-gas liquid from the boil-off gas compressor for stable operation of the reverse flow prevention valve for preventing the reverse flow due to the pressure rise and the L-engine liquid separator operated under subcooling conditions. Install pressure control valve but evaporate the other side of the pipe line The evaporated gas discharged from the evaporative gas compressor for the purpose of the blanket is placed in the upper steam region of the LENG liquid separator for connection to the piping line between the compressor and the cryogenic heat exchanger to control the stable operating pressure and the water level of the L engine liquid separator during the subcooling operation. It is to achieve the above object by providing a boil-off gas subcooled operation system of the L-engine ship, characterized in that the pressure and the water level control of the L-engine liquid separator can be operated in a stable state by allowing to be supplied.

본 발명은 증발가스콤프레셔(10), 냉각시스템(40)과 연결된 초저온용열교환기(20), 엘엔지기액분리기(30)와 가스연소유닛(70)의 배관라인상에 구성된 역흐름방지밸브(50) 및 압력조절밸브(60) 등을 포함하는 엘엔지선의 증발가스 재액화를 위한 과냉액화 운전시스템에 있어서, 상기 엘엔지기액분리기(30)와 역흐름방지밸브(50) 사이의 배관라인에 역흐름방지밸브(50) 및 압력조절밸브(60) 설치구조와 같은 또 다른 병렬형태의 배관라인을 구성하여 상기 배관라인에 비이상적인 압력상승으로 인한 역흐름 방지용 역흐름방지밸브(50') 및 과냉조건으로 운전되는 엘엔지기액분리기(30)의 안정된 운전을 위해 상기 증발가스콤프레셔(10)로부터 증발가스 유량을 조절해줌으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 하기 위한 압력조절밸브(60')를 설치하되, 상기 배관라인의 다른쪽을 증발가스콤프레셔(10)와 초저온용열교환기(20) 사이의 배관라인과 연결하여 과냉액화 운전 시 엘엔지기액분리기(30)의 안정적인 운전 압력 및 수위 제어를 위해 상기 엘엔지기액분리 기(30) 상부 증기영역에 블랭킷 목적으로 증발가스콤프레셔(10)로부터 배출된 증발가스가 공급될 수 있도록 함으로서 엘엔지기액분리기(30)의 압력 및 수위제어가 안정된 상태로 운전될 수 있도록 하는 것을 특징으로 한다.The present invention is a reverse flow prevention valve (50) configured on the piping line of the evaporative gas compressor (10), the cryogenic heat exchanger (20) connected to the cooling system (40), the L-engine liquid separator (30) and the gas combustion unit (70). In the super-cooled liquefaction operation system for the re-liquefaction of the L-engine vessel, including the pressure control valve (60) and the like, the reverse flow prevention in the piping line between the L-engine liquid separator 30 and the reverse flow prevention valve (50) Another parallel type pipe line, such as the valve 50 and pressure control valve 60 installation structure, is formed to prevent reverse flow due to non-ideal pressure rise in the pipe line. Pressure regulating valve (60 ') for maintaining a constant pressure of the L-engine liquid separator 30 by adjusting the evaporation gas flow rate from the boil-off gas compressor (10) for the stable operation of the operated L-engine liquid separator (30) Install) The other side of the pipe line is connected to the pipe line between the boil-off gas compressor 10 and the cryogenic heat exchanger 20 to control the stable operation pressure and the water level of the L-engine liquid separator 30 during the supercooling operation. By allowing the boil-off gas discharged from the boil-off gas compressor 10 to be supplied to the upper steam region of the L-engine liquid separator 30 so that the pressure and water level control of the L-engine liquid separator 30 can be operated in a stable state. Characterized in that.

본 발명 엘엔지선의 증발가스 과냉액화 운전시스템의 구성요소에 대하여 첨부된 도 1을 참조로 상세히 설명하면 다음과 같다. The components of the evaporation gas subcooled liquefaction operation system of the present invention will be described in detail with reference to FIG. 1.

먼저 본 발명 증발가스콤프레셔(10)는 엘엔지선의 카고탱크에서 발생된 증발가스의 안정적인 재액화를 위하여 이를 적정압력까지 압축하여 초저온용열교환기(20)(Cryogenic Heat Exchanger)로 공급하는 역할을 하게 된다.First, the present invention boil-off gas compressor 10 serves to supply a cryogenic heat exchanger 20 by compressing it to an appropriate pressure for stable reliquefaction of the boil-off gas generated in the cargo tank of the L & G line. .

상기 초저온용열교환기(20)는 상기 적정압력으로 압축된 증발가스를 냉각시스템(40)으로 부터의 차가운 냉매(Cold Refrigerant)와 열교환시킴으로써 증발가스를 액화시켜주는 역할을 하게 된다. The cryogenic heat exchanger 20 serves to liquefy the boil-off gas by heat-exchanging the boil-off gas compressed to the appropriate pressure with a cold refrigerant from the cooling system 40.

상기 초저온용열교환기(20)와 연결된 엘엔지기액분리기(30)(LNG Phase Separator)는 상기 초저온용열교환기(20)에서 과냉액화된 엘엔지를 안정적으로 카고탱크로 리턴시켜주는 버퍼탱크 역할을 하게 되며 이때 압력 및 수위를 일정하게 유지시켜주는 것이 매우 중요하기 때문에 상기 엘엔지기액분리기(30)의 수위를 일정하게 유지시켜주는 레벨콘트롤밸브(80)가 설치되어 있다. An LNG phase separator (LNG Phase Separator) connected to the cryogenic heat exchanger (20) serves as a buffer tank for stably returning the supercooled liquefied LENG to the cargo tank from the cryogenic heat exchanger (20). At this time, since it is very important to maintain a constant pressure and level, the level control valve 80 is installed to keep the level of the L-engine liquid separator 30 constant.

그리고 증발가스를 과냉액화시키기 위해서는 특정 온도 및 유량의 냉매가 필요하게 되는데, 이러한 냉매를 만들어내는 냉동싸이클의 일종으로써 압축기(Compressors), 열교환기(Coolers), 팽창기(Turboexpander) 등으로 구성된 냉각시스템(40)이 상기 초저온용열교환기(20)와 연결되어 있다. In order to supercool the boil-off gas, a refrigerant having a specific temperature and flow rate is required, which is a type of refrigeration cycle that produces such a refrigerant, and includes a cooling system including compressors, heat exchangers, and turboexpanders. 40 is connected to the cryogenic heat exchanger 20.

한편, 상기 엘엔지기액분리기(30)는 가스연소유닛(70)(Gas Combustion Unit)의 비이상적인 압력상승으로 인한 역흐름(Reverse Flow)을 방지하기 위해 설치된 역흐름방지밸브(50) 및 엘엔지기액분리기(30)의 비이상적인 운전으로 인한 플래쉬가스 발생 및 압력상승 시, 상기 엘엔지기액분리기(30)로부터 발생된 상기 플래쉬가스를 가스연소유닛(70)으로 배출시킴으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 하기 위한 압력조절밸브(60)를 설치하고 있다. On the other hand, the L-engine liquid separator 30 is the reverse flow prevention valve 50 and the L-engine liquid separator installed to prevent the reverse flow (Reverse Flow) due to the non-ideal pressure rise of the gas combustion unit (70) (Gas Combustion Unit). When the flash gas is generated and the pressure increases due to the non-ideal operation of the 30, the constant pressure of the L engine liquid separator 30 is discharged by discharging the flash gas generated from the EL engine liquid separator 30 to the gas combustion unit 70. A pressure control valve 60 is installed to be maintained.

상기 가스연소유닛(70)은 엘엔지기액분리기(30)의 비이상적인 운전으로 인한 플래쉬가스 발생 및 압력상승 시, 엘엔지기액분리기(30)의 일정 압력유지를 위해 상기 엘엔지기액분리기(30)로부터 발생된 플래쉬가스를 태우는(Oxidizing) 역할을 하기 위해 설치된다. The gas combustion unit 70 is generated from the L-engine liquid separator 30 to maintain a constant pressure of the L-engine liquid separator 30 when the flash gas is generated and the pressure increases due to the non-ideal operation of the L-engine liquid separator 30. Installed for the purpose of oxidizing flash gas (Oxidizing).

특히, 본 발명은 엘엔지기액분리기(30)와 역흐름방지밸브(50) 사이의 배관라인에 역흐름방지밸브(50) 및 압력조절밸브(60) 설치구조와 같은 또 다른 병렬형태의 배관라인을 구성하여 상기 배관라인에 비이상적인 압력상승으로 인한 역흐름 방지용 역흐름방지밸브(50') 및 과냉조건으로 운전되는 엘엔지기액분리기(30)의 안정된 운전을 위해 상기 증발가스콤프레셔(10)로부터 증발가스 유량을 조절해줌으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 하기 위한 압력조절밸브(60')를 설치하되, 상기 배관라인의 다른쪽을 증발가스콤프레셔(10)와 초저온용열교환기(20) 사이의 배관라인과 연결하여 과냉액화 운전 시 엘엔지기액분리기(30)의 안정적인 운전 압력 및 수위 제어를 위해 상기 엘엔지기액분리기(30) 상부 증기영역에 블랭킷 목적으로 증발가스콤프레셔(10)로부터 배출된 증발가스가 공급될 수 있도록 하고 있는 것이다.Particularly, the present invention provides another parallel pipe line such as a reverse flow prevention valve 50 and a pressure control valve 60 in a pipe line between the L engine liquid separator 30 and the reverse flow prevention valve 50. The evaporation gas from the evaporation gas compressor 10 for the stable operation of the reverse flow prevention valve (50 ') for preventing reverse flow due to an abnormal pressure rise in the pipe line and the L-engine liquid separator (30) operated under subcooling conditions. Install a pressure control valve (60 ') to maintain a constant pressure of the L-engine liquid separator (30) by adjusting the flow rate, the other side of the piping line to the evaporative gas compressor (10) and the cryogenic heat exchanger Evaporation for the purpose of blanketing the upper steam region of the L-engine liquid separator (30) for stable operation pressure and level control of the L-engine liquid separator (30) during the subcooling operation by connecting to the pipe line between the (20) Will switch to that discharged from the boil-off gas compressor (10) it can be supplied.

이하 본 발명의 작용을 상세히 설명하면 다음과 같다. Hereinafter, the operation of the present invention will be described in detail.

본 발명은 과냉액화 운전시 엘엔지기액분리기(30)의 증기영역에 증발가스콤프레셔(10)로부터 배출된 증발가스를 블랭킷 목적으로 공급하여 줌으로써 엘엔지기액분리기(30)의 압력 및 수위제어가 안정된 상태로 운전될 수 있도록 하고 있는 것이다. The present invention supplies the evaporated gas discharged from the boil-off gas compressor (10) to the vapor zone of the L-engine liquid separator (30) during the subcooling operation for the purpose of the blanket, so that the pressure and level control of the L-engine liquid separator (30) is stabilized. It is to be able to drive.

본 발명은 각 카고탱크에서 발생된 약 -100℃, 0.05bar,g, 5717㎏/hr의 증발가스가 약 -120℃, 0.05bar,g, 6127㎏/hr의 상태로 증발가스콤프레셔(10)로 공급되어 안정적인 재액화를 위해 약 -27℃, 3.49bar,g,의 적정 온도 및 압력으로 압축되어 초저온용열교환기(20)로 공급된다.The present invention is about -100 ℃, 0.05bar, g, 5717kg / hr evaporated gas generated in each cargo tank is about -120 ℃, 0.05bar, g, 6127kg / hr evaporative gas compressor 10 It is supplied to the cryogenic heat exchanger 20 is compressed to a suitable temperature and pressure of about -27 ℃, 3.49 bar, g, for a stable reliquefaction.

상기와 같이 공급된 증발가스는 상기 증발가스의 과냉액화를 위해 특정 온도 및 유량의 냉매가 필요하게 되는데, 이러한 냉매를 만들어내는 냉동싸이클의 일종로써 압축기, 열교환기(20), 팽창기 등으로 구성된 냉각시스템(40)에 의해 적정압력으로 압축된 증발가스를 상기 냉각시스템(40)으로부터 차가운 냉매와 열교환시킴으로서 증발가스를 액화시켜 주기 위해 설치된 초저온용열교환기(20)를 통해 약 -167.7℃, 3.19bar,g, 6127㎏/hr의 상태로 엘엔지기액분리기(30)로 공급된다.The boil-off gas supplied as described above requires a refrigerant having a specific temperature and flow rate for the subcooling of the boil-off gas, which is a kind of refrigeration cycle that produces such a refrigerant, and is composed of a compressor, a heat exchanger 20, and an expander. About -167.7 ° C, 3.19 bar through the cryogenic heat exchanger 20 installed to liquefy the boil-off gas by heat-exchanging the boil-off gas compressed by the system 40 with the cool refrigerant from the cooling system 40 , g, 6127 kg / hr is supplied to the L-engine liquid separator (30).

한편, 엘엔지기액분리기(30)는 상기 엘엔지기액분리기(30)의 비이상적인 운전으로 인한 플래쉬가스 발생 및 압력상승 시, 엘엔지기액분리기(30)의 일정 압력유지를 위해 상기 엘엔지기액분리기(30)로부터 발생된 플래쉬가스를 태우는 역할을 하기 위해 설치된 가스연소유닛(70)과 이러한 가스연소유닛(70)과 배관라인으로 구 성되어 상기 배관라인상에 플래쉬가스에 의해 비이상적인 압력상승으로 인한 역흐름을 방지하기 위한 역흐름방지밸브(50) 및 압력조절밸브(60)를 통해 엘엔지기액분리기(30)의 비이상적인 운전으로 인한 플래쉬가스 발생 및 압력상승 시, 상기 엘엔지기액분리기(30)로부터 발생된 상기 플래쉬가스를 가스연소유닛(70)으로 배출시킴으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 상기 발생된 플래쉬가스를 태우는 작용을 하게 되는 것이다.On the other hand, the L-engine liquid separator 30 from the L-engine liquid separator 30 to maintain a constant pressure of the L-engine liquid separator 30 when the flash gas is generated and the pressure increases due to the non-ideal operation of the L-engine liquid separator 30. Composed of a gas combustion unit 70 and a pipe line and the gas combustion unit 70 installed to burn the generated flash gas generated by the flash gas on the pipe line due to the non-ideal pressure rise reverse flow When the flash gas generated and the pressure rise due to the non-ideal operation of the L-engine liquid separator 30 through the reverse flow prevention valve 50 and the pressure control valve 60 to prevent the above-mentioned, generated from the L-engine liquid separator 30 The flash gas is discharged to the gas combustion unit 70 to burn the generated flash gas so that a constant pressure of the L engine liquid separator 30 can be maintained. It will be good.

특히, 본 발명은 상기 작용과 함께 엘엔지기액분리기(30)와 역흐름방지밸브(50) 사이의 배관라인에 역흐름방지밸브(50) 및 압력조절밸브(60) 설치구조와 같은 또 다른 병렬형태의 배관라인을 구성하여 상기 배관라인에 비이상적인 압력상승으로 인한 역흐름 방지용 역흐름방지밸브(50') 및 과냉조건으로 운전되는 엘엔지기액분리기(30)의 안정된 운전을 위해 상기 증발가스콤프레셔(10)로부터 증발가스 유량을 조절해줌으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 하기 위한 압력조절밸브(60')를 설치하되, 상기 배관라인의 다른쪽을 증발가스콤프레셔(10)와 초저온용열교환기(20) 사이의 배관라인과 연결하여 과냉액화 운전 시 엘엔지기액분리기(30)의 안정적인 운전 압력 및 수위 제어를 위해 상기 엘엔지기액분리기(30) 상부 증기영역에 블랭킷 목적으로 증발가스콤프레셔(10)로부터 배출된 증발가스가 공급될 수 있도록 함으로서 엘엔지기액분리기(30)의 안정된 운전압력과 수위제어를 용이하게 달성할 수 있게 되는 것이다.In particular, the present invention is another parallel form such as the reverse flow prevention valve 50 and the pressure regulating valve 60 installation structure in the pipe line between the L-engine liquid separator 30 and the reverse flow prevention valve 50 with the above action. By forming a pipe line of the evaporation gas compressor (10) for the stable operation of the reverse flow prevention valve (50 ') for preventing the reverse flow due to the non-ideal pressure rise in the pipe line and the L-engine liquid separator (30) operated under supercooled conditions By installing the pressure control valve (60 ') to maintain a constant pressure of the L-engine liquid separator (30) by adjusting the evaporation gas flow rate from), the other side of the pipe line and the boil-off gas compressor (10) Connected to the pipe line between the cryogenic heat exchanger 20 and a blank in the upper steam region of the L-engine liquid separator 30 for stable operation pressure and water level control of the L-engine liquid separator 30 during the subcooling operation. By allowing the boil-off gas discharged from the boil-off gas compressor 10 to be supplied for the purpose of the kit, it is possible to easily achieve stable operating pressure and level control of the L-engine liquid separator 30.

이상에서는 본 발명의 바람직한 실시예에 대하여 도시하고 설명하였으나 본 발명은 상기한 실시예에 한정되지 아니하며 청구범위에서 청구하는 본 발명의 요지 를 벗어남이 없이 당해 본 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 것은 물론이고 그와 같은 변경은 기재된 청구범위 내에 있게 된다.Although the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment without having to depart from the gist of the present invention claimed in the appended claims Anyone can make various modifications as well as such changes are within the scope of the appended claims.

본 발명은 엘엔지선의 증발가스 재액화시스템을 효율적인 과냉액화 구조로 개량 적용함으로서 엘엔지 리턴라인에서의 이상(Two-phase)영역 과다발생에 의한 추가 증발가스 발생 압력손실 증대에 따른 전력소모량을 효과적으로 줄일수 있을 뿐만 아니라 과냉액화 운전시 엘엔지기액분리기의 증기영역에 증발가스콤프레셔로부터 배출된 증발가스를 블랭킷 목적으로 공급하여 줌으로써 엘엔지기액분리기의 안정된 운전압력과 수위제어에 의한 운전단순화로 인해 경제적인 이점이 있는 매우 유용한 발명이다.








The present invention can effectively reduce the power consumption due to the increase in the pressure loss caused by the additional evaporation gas caused by the excessive occurrence of two-phase zone in the LENG return line by applying the evaporation gas reliquefaction system of the L ENG line to an efficient supercooled liquefaction structure. In addition, by supplying the evaporated gas discharged from the boil-off gas compressor to the vapor zone of the L-engine liquid separator during the supercooling liquid operation for the purpose of the blanket, there is an economic advantage due to the stable operation pressure of the L-engine liquid separator and the simplification by the water level control. It is a very useful invention.








Claims (1)

증발가스콤프레셔(10), 냉각시스템(40)과 연결된 초저온용열교환기(20), 엘엔지기액분리기(30)와 가스연소유닛(70)의 배관라인상에 구성된 역흐름방지밸브(50) 및 압력조절밸브(60) 등을 포함하는 엘엔지선의 증발가스 재액화를 위한 과냉액화 운전시스템에 있어서, 상기 엘엔지기액분리기(30)와 역흐름방지밸브(50) 사이의 배관라인에 역흐름방지밸브(50) 및 압력조절밸브(60) 설치구조와 같은 또 다른 병렬형태의 배관라인을 구성하여 상기 배관라인에 비이상적인 압력상승으로 인한 역흐름 방지용 역흐름방지밸브(50') 및 과냉조건으로 운전되는 엘엔지기액분리기(30)의 안정된 운전을 위해 상기 증발가스콤프레셔(10)로부터 증발가스 유량을 조절해줌으로써 엘엔지기액분리기(30)의 일정 압력이 유지될 수 있도록 하기 위한 압력조절밸브(60')를 설치하되, 상기 배관라인의 다른쪽을 증발가스콤프레셔(10)와 초저온용열교환기(20) 사이의 배관라인과 연결하여 과냉액화 운전 시 엘엔지기액분리기(30)의 안정적인 운전 압력 및 수위 제어를 위해 상기 엘엔지기액분리기(30) 상부 증기영역에 블랭킷 목적으로 증발가스콤프레셔(10)로부터 배출된 증발가스가 공급될 수 있도록 함으로서 엘엔지기액분리기(30)의 압력 및 수위제어가 안정된 상태로 운전될 수 있도록 하는 것을 특징으로 하는 엘엔지선의 증발가스 과냉액화 운전시스템.Evaporative gas compressor 10, the cryogenic heat exchanger 20 connected to the cooling system 40, the L-engine liquid separator 30 and the reverse flow prevention valve 50 and the pressure configured on the piping line of the gas combustion unit 70 In the supercooled liquefaction operation system for re-liquefying the evaporated gas of the L engine line including a control valve (60), etc., the reverse flow prevention valve (50) in the piping line between the L-engine liquid separator (30) and the reverse flow prevention valve (50) ) And the pressure control valve (60) to form another parallel type of pipe line to prevent the reverse flow caused by non-ideal pressure rise in the pipe line reverse flow prevention valve (50 ') and the LG operating under supercooling conditions A pressure control valve 60 'is installed to maintain a constant pressure of the EL engine liquid separator 30 by adjusting the flow rate of the evaporated gas from the evaporative gas compressor 10 for stable operation of the gas liquid separator 30. But The other side of the pipe line is connected to the pipe line between the evaporative gas compressor 10 and the cryogenic heat exchanger 20 to control the stable operating pressure and the water level of the L engine liquid separator 30 during the supercooled liquid operation. (30) By allowing the boil-off gas discharged from the boil-off gas compressor 10 to be supplied to the upper steam region for the purpose of the blanket, the pressure and water level control of the L-engine liquid separator 30 can be operated in a stable state. LNG ship's evaporative gas supercooling operation system.
KR1020050004650A 2005-01-18 2005-01-18 Operating system for sub-cooled liquefaction boil-off gas of LNG ship KR100638924B1 (en)

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Application Number Priority Date Filing Date Title
KR1020050004650A KR100638924B1 (en) 2005-01-18 2005-01-18 Operating system for sub-cooled liquefaction boil-off gas of LNG ship
US11/184,282 US20060156758A1 (en) 2005-01-18 2005-07-19 Operating system of liquefied natural gas ship for sub-cooling and liquefying boil-off gas
JP2005209561A JP2006200735A (en) 2005-01-18 2005-07-20 Evaporative emission supercooling liquefaction operation system of liquefied natural gas carrier
FR0508023A FR2880942B1 (en) 2005-01-18 2005-07-27 OPERATIONAL SYSTEM OF LIQUEFIED NATURAL GAS TRANSPORTER SHIP FOR SUB-COOLING AND LIQUEFYING SPRAY GAS
PCT/KR2006/000086 WO2006078104A1 (en) 2005-01-18 2006-01-10 Operating system of liquefied natural gas ship for sub-cooling and liquefying boil-off gas
US12/001,146 US20080120993A1 (en) 2005-01-18 2007-12-10 Operating system of liquefied natural gas ship for sub-cooling and liquefying boil-off gas
US12/688,411 US8256230B2 (en) 2005-01-18 2010-01-15 Operating system of liquefied natural gas ship for subcooling and liquefying boil-off gas

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KR100883742B1 (en) * 2007-10-09 2009-02-13 현대중공업 주식회사 Temperature control system of natural boil-off gas for lng carrier using duel fuel diesel electric propulsion engine
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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
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