KR20240069874A - System for reducing boil off gas of storage tank of ship - Google Patents

System for reducing boil off gas of storage tank of ship Download PDF

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KR20240069874A
KR20240069874A KR1020220150370A KR20220150370A KR20240069874A KR 20240069874 A KR20240069874 A KR 20240069874A KR 1020220150370 A KR1020220150370 A KR 1020220150370A KR 20220150370 A KR20220150370 A KR 20220150370A KR 20240069874 A KR20240069874 A KR 20240069874A
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South Korea
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storage tank
nitrogen
line
liquefied gas
vaporizer
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KR1020220150370A
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Korean (ko)
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정승재
류시진
박아민
이호기
전준우
최병윤
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삼성중공업 주식회사
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Publication of KR20240069874A publication Critical patent/KR20240069874A/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
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
    • 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
    • F17C2265/05—Regasification
    • 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
    • F17C2265/06—Fluid distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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

Abstract

선박 저장탱크의 증발가스감소시스템이 개시된다. 본 발명의 실시 예에 의한 선박 저장탱크의 증발가스감소시스템은 질소저장탱크로부터 공급된 액화질소와 액화가스저장탱크로부터 공급된 액화가스 간 열교환을 수행하여, 액화가스를 과냉각시키는 서브쿨러; 과냉각된 액화가스를 액화가스저장탱크 내부로 회수하는 회수라인; 질소저장탱크로부터 공급받은 액화질소를 가열하여 기화시키는 제1기화기; 질소저장탱크와 제1기화기를 연결하고, 제1기화기에 의해 기화된 유체를 수요처로 공급하는 수요처공급라인; 제1기화기를 바이패스하도록 수요처공급라인의 제1기화기 전단과 후단을 연결하며, 제어밸브를 마련한 바이패스라인; 및 질소저장탱크로부터 공급된 액화질소를 서브쿨러를 거쳐 수요처공급라인의 제1기화기 후단으로 합류시키는 질소가스합류라인;을 포함하되, 제어밸브는 수요처공급라인을 통해 수요처 쪽으로 흘러가는 유체의 온도값을 기초로 개방 정도가 제어되어, 수요처의 온도 요구조건에 맞게 유체의 온도가 조절되도록 한다.A system for reducing evaporative gases in ship storage tanks is disclosed. The evaporation gas reduction system of a ship storage tank according to an embodiment of the present invention includes a subcooler that supercools the liquefied gas by performing heat exchange between the liquefied nitrogen supplied from the nitrogen storage tank and the liquefied gas supplied from the liquefied gas storage tank; A recovery line for recovering supercooled liquefied gas into the liquefied gas storage tank; A first vaporizer that heats and vaporizes liquid nitrogen supplied from a nitrogen storage tank; a demand-side supply line that connects the nitrogen storage tank and the first vaporizer and supplies the fluid vaporized by the first vaporizer to the demand side; A bypass line connecting the front and rear ends of the first vaporizer of the demand supply line to bypass the first vaporizer and provided with a control valve; And a nitrogen gas confluence line that merges the liquid nitrogen supplied from the nitrogen storage tank to the rear end of the first vaporizer of the demand source supply line through a subcooler; wherein the control valve is configured to control the temperature value of the fluid flowing toward the demand source through the demand source supply line. Based on this, the degree of opening is controlled so that the temperature of the fluid is adjusted to suit the temperature requirements of the consumer.

Description

선박 저장탱크의 증발가스감소시스템{SYSTEM FOR REDUCING BOIL OFF GAS OF STORAGE TANK OF SHIP}Evaporative gas reduction system for ship storage tanks {SYSTEM FOR REDUCING BOIL OFF GAS OF STORAGE TANK OF SHIP}

본 발명은 선박 저장탱크의 증발가스감소시스템에 관한 것이다.The present invention relates to a system for reducing evaporative gases in ship storage tanks.

온실가스 및 각종 대기오염 물질의 배출에 대한 국제해사기구(IMO, International Maritime Organization)의 규제가 강화됨에 따라 조선 및 해운업계에서는 기존 연료인 중유, 디젤유의 이용을 대신하여, 청정 에너지원인 천연가스를 선박의 연료가스로 이용하는 경우가 많아지고 있다.As the International Maritime Organization (IMO)'s regulations on the emission of greenhouse gases and various air pollutants are strengthened, the shipbuilding and shipping industry is using natural gas, a clean energy source, instead of using existing fuels such as heavy oil and diesel oil. It is increasingly being used as fuel gas for ships.

연료가스 중에서 널리 이용되고 있는 천연가스(Natural Gas)는 메탄(Methane)을 주성분으로 하며, 통상적으로 그 부피를 1/600로 줄인 액화가스(Liquefied Gas) 상태로 변환되어 저장탱크에 저장된다. 이러한 액화가스(예컨대 LNG)가 저장된 저장탱크 내부에서는 외부의 열 유입에 따라 증발가스가 발생하여 저장탱크 내부의 압력이 상승하게 된다.Natural gas, which is widely used among fuel gases, contains methane as its main ingredient, and is usually converted to liquefied gas with its volume reduced to 1/600 and stored in a storage tank. Inside the storage tank where such liquefied gas (for example, LNG) is stored, evaporation gas is generated due to the influx of external heat, thereby increasing the pressure inside the storage tank.

종래에는 저장탱크 내부의 압력 조절을 위해, 냉매를 압축시키고, 압축된 냉매를 냉각수와 열교환시켜 냉각시킨 후 팽창시키고, 저장탱크로부터 공급된 증발가스를 상술한 팽창된 냉매와 열교환시켜 액화시킨 후 저장탱크로 회수함으로써 저장탱크 내부의 압력 조절에 이용하였다. 관련된 종래기술로서 한국공개특허 제2016-0086554호(2016.07.20. 공개)를 참조하기 바란다.Conventionally, in order to control the pressure inside the storage tank, the refrigerant is compressed, the compressed refrigerant is cooled by heat exchange with cooling water, and then expanded, and the boil-off gas supplied from the storage tank is liquefied by heat exchange with the expanded refrigerant and then stored. By returning it to the tank, it was used to control the pressure inside the storage tank. Please refer to Korea Patent Publication No. 2016-0086554 (published on July 20, 2016) as related prior art.

그러나, 저장탱크 내부에서 발생하는 증발가스 발생량을 보다 효과적으로 감소시켜, 전체 설비 및 시스템의 효율성을 향상시킬 필요성이 제기된다.However, there is a need to improve the efficiency of the entire facility and system by more effectively reducing the amount of evaporative gas generated inside the storage tank.

한국공개특허 제2016-0086554호(2016.07.20. 공개)Korean Patent Publication No. 2016-0086554 (published on July 20, 2016)

본 발명의 실시 예는 액화질소와의 열교환에 의해 과냉각된 액화가스를 다시 저장탱크로 회수함으로써, 저장탱크 내부의 압력 조절을 효과적으로 수행할 수 있고, 액화가스에 냉열을 전달한 액화질소는 수요처의 온도조건에 맞게 조절하여 수요처로 공급하여 배관 쿨다운 및 퍼지 등에 활용할 수 있는 선박 저장탱크의 증발가스감소시스템을 제공하고자 한다.In an embodiment of the present invention, the pressure inside the storage tank can be effectively controlled by returning the liquefied gas that has been supercooled by heat exchange with liquefied nitrogen back to the storage tank, and the liquefied nitrogen that has transferred cold heat to the liquefied gas is at the temperature of the consumer. We aim to provide a evaporative gas reduction system for ship storage tanks that can be adjusted to suit conditions and supplied to the customer and used for piping cooldown and purge.

본 발명의 일 측면에 따르면, 질소저장탱크로부터 공급된 액화질소와 액화가스저장탱크로부터 공급된 액화가스 간 열교환을 수행하여, 상기 액화가스를 과냉각시키는 서브쿨러; 상기 과냉각된 액화가스를 상기 액화가스저장탱크 내부로 회수하는 회수라인; 상기 질소저장탱크로부터 공급받은 액화질소를 가열하여 기화시키는 제1기화기; 상기 질소저장탱크와 제1기화기를 연결하고, 상기 제1기화기에 의해 기화된 유체를 수요처로 공급하는 수요처공급라인; 상기 제1기화기를 바이패스하도록 상기 수요처공급라인의 제1기화기 전단과 후단을 연결하며, 제어밸브를 마련한 바이패스라인; 및 상기 질소저장탱크로부터 공급된 액화질소를 상기 서브쿨러를 거쳐 상기 수요처공급라인의 제1기화기 후단으로 합류시키는 질소가스합류라인;을 포함하되, 상기 제어밸브는 상기 수요처공급라인을 통해 상기 수요처 쪽으로 흘러가는 유체의 온도값을 기초로 개방 정도가 제어되어, 상기 수요처의 온도 요구조건에 맞게 상기 유체의 온도가 조절되도록 하는 선박 저장탱크의 증발가스감소시스템이 제공될 수 있다.According to one aspect of the present invention, a subcooler performs heat exchange between liquefied nitrogen supplied from a nitrogen storage tank and liquefied gas supplied from a liquefied gas storage tank, thereby supercooling the liquefied gas; A recovery line for recovering the supercooled liquefied gas into the liquefied gas storage tank; a first vaporizer that heats and vaporizes the liquid nitrogen supplied from the nitrogen storage tank; a demand-side supply line that connects the nitrogen storage tank and the first vaporizer and supplies fluid vaporized by the first vaporizer to the demand side; A bypass line connecting the front and rear ends of the first vaporizer of the demand supply line to bypass the first vaporizer and provided with a control valve; And a nitrogen gas convergence line that merges the liquid nitrogen supplied from the nitrogen storage tank to the rear end of the first vaporizer of the demand source supply line through the subcooler, wherein the control valve moves toward the demand source through the demand source supply line. An evaporative gas reduction system for a ship storage tank may be provided in which the degree of opening is controlled based on the temperature value of the flowing fluid, so that the temperature of the fluid is adjusted to suit the temperature requirements of the consumer.

상기 회수라인과 상기 액화가스저장탱크의 내측 상부에 마련된 분사라인을 연결하며, 상기 과냉각된 액화가스를 상기 분사라인으로 공급하여 상기 액화가스저장탱크의 내부에 분사되도록 하는 제1연결라인을 더 포함할 수 있다.It connects the recovery line and the injection line provided on the upper inner side of the liquefied gas storage tank, and further includes a first connection line for supplying the supercooled liquefied gas to the injection line so that it is injected into the inside of the liquefied gas storage tank. can do.

상기 액화가스저장탱크와 상기 서브쿨러를 연결하여, 상기 액화가스저장탱크로부터 공급된 액화가스를 상기 서브쿨러로 공급하는 액화가스공급라인과, 상기 액화가스공급라인으로부터 분기되어 상기 분기라인과 연결되며, 상기 액화가스저장탱크로부터 공급된 액화가스 중 적어도 일부를 상기 분사라인으로 공급하는 제2연결라인을 더 포함할 수 있다.A liquefied gas supply line connects the liquefied gas storage tank and the sub-cooler to supply liquefied gas supplied from the liquefied gas storage tank to the sub-cooler, and is branched from the liquefied gas supply line and connected to the branch line. , It may further include a second connection line for supplying at least a portion of the liquefied gas supplied from the liquefied gas storage tank to the injection line.

상기 질소저장탱크로부터 공급받은 액화질소를 대기와 열교환하여 기화시키는 제2기화기와, 상기 질소가스합류라인의 서브쿨러 전단과 상기 제2기화기를 연결하며, 상기 제2기화기를 통과한 유체를 상기 질소가스합류라인에 합류시키는 기화가스합류라인과, 상기 질소가스합류라인으로부터 분기되어 상기 질소저장탱크와 연결되며, 상기 질소저장탱크 내부의 압력 조절을 위해 상기 질소가스합류라인을 통해 흘러가는 유체 중 적어도 일부를 상기 질소저장탱크 내측으로 보내는 압력조절라인을 더 포함할 수 있다.A second vaporizer that vaporizes the liquid nitrogen supplied from the nitrogen storage tank by exchanging heat with the atmosphere, connects the front end of the subcooler of the nitrogen gas convergence line to the second vaporizer, and converts the fluid passing through the second vaporizer into the nitrogen. At least one of the vaporized gas convergence line joining the gas confluence line, the nitrogen gas confluence line branched from the nitrogen storage tank and connected to the nitrogen storage tank, and the fluid flowing through the nitrogen gas confluence line to adjust the pressure inside the nitrogen storage tank. It may further include a pressure control line that sends a portion to the inside of the nitrogen storage tank.

본 발명의 실시 예에 의한 선박 저장탱크의 증발가스감소시스템은 액화질소와의 열교환에 의해 과냉각된 액화가스를 다시 저장탱크로 회수함으로써, 저장탱크 내부의 압력 조절을 효과적으로 수행할 수 있고, 액화가스에 냉열을 전달한 액화질소는 수요처의 온도조건에 맞게 조절하여 수요처로 공급하여 배관 쿨다운 및 퍼지 등에 활용할 수 있다.The evaporation gas reduction system of a ship's storage tank according to an embodiment of the present invention can effectively control the pressure inside the storage tank by recovering the liquefied gas supercooled by heat exchange with liquefied nitrogen back to the storage tank, and the liquefied gas Liquid nitrogen that has transferred cold heat to the customer can be adjusted to suit the temperature conditions of the customer and supplied to the customer and used for piping cooldown and purge.

본 발명의 효과들은 이상에서 언급한 효과들로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 실시 예에 따른 선박 저장탱크의 증발가스감소시스템을 도시한다.Figure 1 shows a system for reducing evaporative gases in a ship storage tank according to an embodiment of the present invention.

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

도 1은 본 발명의 실시 예에 따른 선박 저장탱크의 증발가스감소시스템을 도시한다.Figure 1 shows a system for reducing evaporative gases in a ship storage tank according to an embodiment of the present invention.

도 1을 참조하면, 본 발명의 실시 예에 따른 선박 저장탱크의 증발가스감소시스템(100)은 질소저장탱크(101)로부터 공급된 액화질소와 액화가스저장탱크(102)로부터 공급된 액화가스 간 열교환을 수행하여, 액화가스를 과냉각시키는 서브쿨러(110)와, 서브쿨러(110)에 의해 과냉각된 액화가스를 액화가스저장탱크(102) 내부로 회수하는 회수라인(L11)과, 질소저장탱크(101)로부터 공급받은 액화질소를 가열하여 기화시키는 제1기화기(120)와, 질소저장탱크(101)와 제1기화기(120)를 연결하고, 제1기화기(120)에 의해 기화된 유체를 수요처(103)로 공급하는 수요처공급라인(L12)과, 제1기화기(120)를 바이패스하도록 수요처공급라인(L12)의 제1기화기(120) 전단과 후단을 연결하며, 제어밸브(125)를 마련한 바이패스라인(L13)과, 질소저장탱크(101)로부터 공급된 액화질소를 서브쿨러(110)를 거쳐 수요처공급라인(L12)의 제1기화기(120) 후단으로 합류시키는 질소가스합류라인(L14)을 포함하되, 제어밸브(125)는 수요처공급라인(L12)을 통해 수요처(103) 쪽으로 흘러가는 유체의 온도값을 기초로 개방 정도가 제어되어, 수요처(103)의 온도 요구조건에 맞게 유체의 온도가 조절되도록 한다.Referring to FIG. 1, the evaporation gas reduction system 100 of a ship storage tank according to an embodiment of the present invention is a system for reducing liquefied nitrogen supplied from the nitrogen storage tank 101 and the liquefied gas supplied from the liquefied gas storage tank 102. A subcooler 110 that performs heat exchange to supercool the liquefied gas, a recovery line (L11) that recovers the liquefied gas supercooled by the subcooler 110 into the liquefied gas storage tank 102, and a nitrogen storage tank. A first vaporizer (120) that heats and vaporizes the liquid nitrogen supplied from (101) is connected to the nitrogen storage tank (101) and the first vaporizer (120), and the fluid vaporized by the first vaporizer (120) is The demand source supply line (L12) that supplies to the demand source (103) is connected to the front and rear ends of the first vaporizer (120) of the demand source supply line (L12) to bypass the first vaporizer (120), and the control valve (125) A bypass line (L13) is provided, and a nitrogen gas confluence line that merges the liquid nitrogen supplied from the nitrogen storage tank (101) to the rear end of the first vaporizer (120) of the demand supply line (L12) via the subcooler (110). (L14), but the control valve 125 is controlled in its degree of opening based on the temperature value of the fluid flowing toward the demander 103 through the demander supply line L12, so as to meet the temperature requirements of the demander 103. Ensure that the temperature of the fluid is adjusted appropriately.

여기서, 증발가스감소시스템(100)은 회수라인(L11)과 액화가스저장탱크(102)의 내측 상부에 마련된 분사라인(L15)을 연결하며, 과냉각된 액화가스를 분사라인(L15)으로 공급하여 액화가스저장탱크(102)의 내부에 분사되도록 하는 제1연결라인(L16)을 포함할 수 있다.Here, the boil-off gas reduction system 100 connects the recovery line L11 and the injection line L15 provided on the inner upper part of the liquefied gas storage tank 102, and supplies supercooled liquefied gas to the injection line L15. It may include a first connection line (L16) that allows injection into the inside of the liquefied gas storage tank (102).

또, 증발가스감소시스템(100)은 액화가스저장탱크(102)와 서브쿨러(110)를 연결하여, 액화가스저장탱크(102)로부터 공급된 액화가스를 서브쿨러(110)로 공급하는 액화가스공급라인(L17)과, 액화가스공급라인(L17)으로부터 분기되어 분기라인(L15)과 연결되며, 액화가스저장탱크(102)로부터 공급된 액화가스 중 적어도 일부를 분사라인(L15)으로 공급하는 제2연결라인(L18)을 포함할 수 있다.In addition, the boil-off gas reduction system 100 connects the liquefied gas storage tank 102 and the subcooler 110 to supply the liquefied gas supplied from the liquefied gas storage tank 102 to the subcooler 110. It is branched from the supply line (L17) and the liquefied gas supply line (L17) and connected to the branch line (L15), and supplies at least a portion of the liquefied gas supplied from the liquefied gas storage tank 102 to the injection line (L15). It may include a second connection line (L18).

또, 증발가스감소시스템(100)은 질소저장탱크(101)로부터 공급받은 액화질소를 대기와 열교환하여 기화시키는 제2기화기(130)와, 질소가스합류라인(L14)의 서브쿨러(110) 전단과 제2기화기(130)를 연결하며, 제2기화기(130)를 통과한 유체를 질소가스합류라인(L14)에 합류시키는 기화가스합류라인(L19)과, 질소가스합류라인(L14)으로부터 분기되어 질소저장탱크(101)와 연결되며, 질소저장탱크(101) 내부의 압력 조절을 위해 질소가스합류라인(L14)을 통해 흘러가는 유체 중 적어도 일부를 질소저장탱크(101) 내측으로 보내는 압력조절라인(L20)을 포함할 수 있다.In addition, the evaporative gas reduction system 100 includes a second vaporizer 130 that vaporizes the liquid nitrogen supplied from the nitrogen storage tank 101 by exchanging heat with the atmosphere, and a front end of the subcooler 110 of the nitrogen gas confluence line (L14). and the second vaporizer 130, and a vaporized gas convergence line (L19) that connects the fluid that passed through the second vaporizer (130) to the nitrogen gas confluence line (L14), and branches off from the nitrogen gas confluence line (L14). It is connected to the nitrogen storage tank (101), and controls the pressure by sending at least part of the fluid flowing through the nitrogen gas confluence line (L14) to the inside of the nitrogen storage tank (101) to control the pressure inside the nitrogen storage tank (101). It may include line L20.

이하, 증발가스 감소시스템(100)의 각 구성요소에 대해서 구체적으로 설명한다.Hereinafter, each component of the evaporative gas reduction system 100 will be described in detail.

선박 저장탱크의 증발가스감소시스템(100)은 예컨대 액화연료 운반선, 액화연료 RV(Regasification Vessel), 컨테이너선, 일반상선, LNG FPSO(Floating, Production, Storage and Off-loading), LNG FSRU(Floating Storage and Regasification Unit) 등을 포함하는 각종 선박에 구비될 수 있다.The evaporation gas reduction system 100 of a ship storage tank is, for example, liquefied fuel carrier, liquefied fuel RV (Regasification Vessel), container ship, general merchant ship, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU (Floating Storage) and Regasification Unit).

질소저장탱크(101)는 액화질소 및 이의 증발가스를 저장한다.The nitrogen storage tank 101 stores liquefied nitrogen and its boil-off gas.

서브쿨러(110)는 질소가스합류라인(L14)을 통해 질소저장탱크(101)로부터 액화질소를 공급받고, 이를 액화가스저장탱크(102)로부터 액화가스공급라인(L17)을 통해 공급받은 액화가스와 열교환을 수행한다. 서브쿨러(110)는 액화질소의 냉열을 액화가스에 전달하여 액화가스를 과냉각시킨다.The subcooler 110 receives liquefied nitrogen from the nitrogen storage tank 101 through the nitrogen gas confluence line (L14), and liquefied nitrogen is supplied from the liquefied gas storage tank 102 through the liquefied gas supply line (L17). performs heat exchange with The subcooler 110 transfers the cold heat of the liquefied nitrogen to the liquefied gas and supercools the liquefied gas.

질소저장탱크(101)로부터 공급된 액화질소는 서브쿨러(110)를 거쳐 질소가스합류라인(L14)을 통해 수요처공급라인(L12)의 제1기화기(120) 후단으로 합류되며, 그 중 일부는 질소저장탱크(101) 내측으로 공급될 수 있다.The liquid nitrogen supplied from the nitrogen storage tank 101 passes through the subcooler 110 and joins the rear end of the first vaporizer 120 of the demand supply line L12 through the nitrogen gas confluence line L14, some of which It can be supplied inside the nitrogen storage tank (101).

제1기화기(120)는 수요처공급라인(L12)을 통해 질소저장탱크(101)로부터 액화질소를 공급받아 가열하여 기화시킨다.The first vaporizer 120 receives liquid nitrogen from the nitrogen storage tank 101 through the demand supply line L12, heats it, and vaporizes it.

이때, 수요처공급라인(L12)에는 제1기화기(120)를 바이패스하도록 수요처공급라인(L12)의 제1기화기(120) 전단과 후단을 연결하는 바이패스라인(L13)이 마련되어 있다.At this time, the demand source supply line (L12) is provided with a bypass line (L13) connecting the front and rear ends of the first vaporizer 120 of the demand source supply line (L12) to bypass the first vaporizer 120.

바이패스라인(L13)은 질소저장탱크(101)로부터 공급된 액화질소를 제1기화기(120)를 거치지 않고, 수요처공급라인(L12)을 통해 수요처(103)로 공급한다.The bypass line (L13) supplies the liquid nitrogen supplied from the nitrogen storage tank (101) to the consumer (103) through the consumer supply line (L12) without passing through the first vaporizer (120).

수요처공급라인(L12)의 제1기화기(120) 및 바이패스라인(L13)을 통과한 유체는 상술한 질소가스합류라인(L14)을 통해 공급된 유체와 혼합되어 수요처(103) 쪽으로 공급된다. The fluid that has passed through the first vaporizer 120 and the bypass line (L13) of the demand source supply line (L12) is mixed with the fluid supplied through the above-described nitrogen gas confluence line (L14) and is supplied to the demand source (103).

이때, 수요처공급라인(L12)에 마련된 온도측정기(127)는 상술한 혼합 유체의 온도를 측정하며, 바이패스라인(L13)에 마련된 제어밸브(125)는 온도측정기(127)에 의해 측정된 혼합 유체의 온도값을 기초로 개방 정도가 제어되어, 수요처(103)의 온도 요구조건에 맞게 혼합 유체의 온도가 조절되도록 한다.At this time, the temperature measuring device 127 provided in the demand supply line (L12) measures the temperature of the above-mentioned mixed fluid, and the control valve 125 provided in the bypass line (L13) measures the mixed fluid measured by the temperature measuring device 127. The degree of opening is controlled based on the temperature value of the fluid, so that the temperature of the mixed fluid is adjusted to suit the temperature requirements of the demander 103.

수요처공급라인(L12)을 통해 수요처(103)로 공급된 유체는 배관 쿨다운 및 퍼지 등에 활용될 수 있어, 액화가스 과냉각에 사용된 질소의 활용도를 높일 수 있다.The fluid supplied to the demander (103) through the demander supply line (L12) can be used for piping cooldown and purge, etc., thereby increasing the utilization of nitrogen used in liquefied gas supercooling.

제2기화기(130)는 기화가스합류라인(L19)을 통해 질소저장탱크(101)로부터 공급받은 액화질소를 대기와 열교환하여 기화시킨다. 여기서, 기화가스합류라인(L19)은 질소가스합류라인(L14)의 서브쿨러(110) 전단으로부터 분기되어 제2기화기(130)와 연결될 수 있다.The second vaporizer 130 vaporizes the liquefied nitrogen supplied from the nitrogen storage tank 101 through the vaporized gas confluence line L19 by exchanging heat with the atmosphere. Here, the vaporized gas convergence line (L19) may be branched from the front end of the subcooler (110) of the nitrogen gas confluence line (L14) and connected to the second vaporizer (130).

제2기화기(130)는 대기식 열교환기 방식으로 액화질소를 기화시키므로 온도제어가 어렵다. 제2기화기(130)를 통과한 유체는 질소가스합류라인(L14)에 합류되어 서브쿨러(110)를 통과한 유체와 함께 수요처공급라인(L12)으로 합류되거나, 액화가스저장탱크(102) 내부로 공급되어 질소저장탱크(101)의 내부 압력 유지에 사용될 수 있다.The second vaporizer 130 vaporizes liquid nitrogen using an atmospheric heat exchanger, so temperature control is difficult. The fluid that has passed through the second vaporizer (130) joins the nitrogen gas confluence line (L14) and joins the demand supply line (L12) together with the fluid that has passed through the subcooler (110), or is stored inside the liquefied gas storage tank (102). It can be used to maintain the internal pressure of the nitrogen storage tank (101).

질소가스합류라인(L14)을 통해 수요처공급라인(L12)으로 합류된 유체의 온도가 수요처(103)의 온도 요구조건에 맞도록, 본 발명의 실시 예에서는 상술한 바이패스라인(L13)의 제어밸브(125)에 의해 수요처(103)로 공급되는 유체의 온도를 수요처(103)의 온도 요구조건에 맞게 조절한다.In the embodiment of the present invention, the bypass line (L13) is controlled so that the temperature of the fluid joined to the demand source supply line (L12) through the nitrogen gas confluence line (L14) meets the temperature requirements of the demand source (103). The temperature of the fluid supplied to the demand source 103 by the valve 125 is adjusted to suit the temperature requirements of the demand source 103.

한편, 액화가스저장탱크(102)는 예컨대 액화천연가스(LNG, Liquefied Natural Gas)를 저장할 수 있으며, 단열상태를 유지하면서 연료를 액화상태로 저장하는 멤브레인형 탱크, SPB형 탱크 등을 포함할 수 있다. 다른 예에서 액화가스저장탱크(102)는 LPG, 에탄올, 메탄올 등의 액화가스를 저장할 수 있다.Meanwhile, the liquefied gas storage tank 102 can store, for example, liquefied natural gas (LNG), and may include a membrane-type tank or SPB-type tank that stores fuel in a liquefied state while maintaining insulation. there is. In another example, the liquefied gas storage tank 102 can store liquefied gas such as LPG, ethanol, and methanol.

액화가스저장탱크(102)는 내부의 펌프(P)에 의해 펌핑된 액화가스를 액화가스공급라인(L17)을 통해 서브쿨러(110)로 공급하며, 서브쿨러(110)에 의해 과냉각된 액화가스는 회수라인(L11)을 통해 액화가스저장탱크(102) 내부로 회수되어 증발가스를 효과적으로 감소시켜 액화가스저장탱크(102) 내부의 압력 조절에 이용된다.The liquefied gas storage tank 102 supplies the liquefied gas pumped by the internal pump (P) to the subcooler 110 through the liquefied gas supply line (L17), and the liquefied gas supercooled by the subcooler 110 is recovered into the liquefied gas storage tank 102 through the recovery line (L11) and is used to effectively reduce boil-off gas and control the pressure inside the liquefied gas storage tank 102.

회수라인(L11)은 액화가스저장탱크(102)의 내부 바텀(Bottom) 부위로 연장될 수 있으며, 과냉각된 액화가스를 액화가스저장탱크(102)에 저장된 액화가스와 혼합시킬 수 있다. 이를 통해 액화가스저장탱크(102) 내부의 증발가스 발생량을 감소시킬 수 있다.The recovery line (L11) can be extended to the inner bottom of the liquefied gas storage tank 102, and can mix the supercooled liquefied gas with the liquefied gas stored in the liquefied gas storage tank 102. Through this, the amount of boil-off gas generated inside the liquefied gas storage tank 102 can be reduced.

제1연결라인(L16)은 회수라인(L11)으로부터 분기되어, 액화가스저장탱크(102)의 내측 상부에 마련된 분사라인(L15)으로 연결되며, 서브쿨러(110)에 의해 과냉각된 액화가스를 분사라인(L15)으로 공급하여 액화가스저장탱크(102)의 내부에 분사되도록 한다.The first connection line (L16) branches off from the recovery line (L11) and connects to the injection line (L15) provided on the upper inner side of the liquefied gas storage tank 102, and supplies the liquefied gas supercooled by the subcooler 110. It is supplied to the spray line (L15) and sprayed into the inside of the liquefied gas storage tank (102).

분사라인(L15)에는 설정 간격으로 복수의 노즐이 마련되어, 액화가스저장탱크(102)의 내부로 유체를 분사시킬 수 있다.The injection line (L15) is provided with a plurality of nozzles at set intervals, so that fluid can be injected into the inside of the liquefied gas storage tank (102).

또, 제2연결라인(L18)은 액화가스공급라인(L17)으로부터 분기되어 액화가스저장탱크(102)의 내측 상부에 마련된 분사라인(L15)에 연결된다. 제2연결라인(L18)은 액화가스저장탱크(102)로부터 공급된 액화가스 중 적어도 일부를 분사라인(L15)으로 공급한다. 이때, 상술한 제1연결라인(L16)은 제2연결라인(L18)과 연결되어, 과냉각된 액화가스를 제2연결라인(L18)에 합류시킬 수 있다.In addition, the second connection line (L18) is branched from the liquefied gas supply line (L17) and connected to the injection line (L15) provided on the upper inner side of the liquefied gas storage tank (102). The second connection line (L18) supplies at least a portion of the liquefied gas supplied from the liquefied gas storage tank (102) to the injection line (L15). At this time, the above-described first connection line (L16) is connected to the second connection line (L18), so that the supercooled liquefied gas can join the second connection line (L18).

이상에서는 특정의 실시 예에 대하여 도시하고 설명하였다. 그러나, 본 발명은 상기한 실시 예에만 한정되지 않으며, 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 이하의 청구범위에 기재된 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경 실시할 수 있을 것이다.In the above, specific embodiments are shown and described. However, the present invention is not limited to the above-described embodiments, and those skilled in the art can make various changes without departing from the gist of the technical idea of the invention as set forth in the claims below. You will be able to.

101: 질소저장탱크 102: 액화가스저장탱크
103: 수요처 110: 서브쿨러
120: 제1기화기 125: 제어밸브
127: 온도측정기 130: 제2기화기
L11: 회수라인 L12: 수요처공급라인
L13: 바이패스라인 L14: 질소가스합류라인
L15: 분사라인 L16: 제1연결라인
L17: 액화가스공급라인 L18: 제2연결라인
L19: 기화가스합류라인 L20: 압력조절라인101: nitrogen storage tank 102: liquefied gas storage tank
103: Demand 110: Subcooler
120: first carburetor 125: control valve
127: Temperature meter 130: Second vaporizer
L11: Recovery line L12: Demand supply line
L13: Bypass line L14: Nitrogen gas confluence line
L15: Injection line L16: First connection line
L17: Liquefied gas supply line L18: Second connection line
L19: Vaporized gas confluence line L20: Pressure control line

Claims (4)

질소저장탱크로부터 공급된 액화질소와 액화가스저장탱크로부터 공급된 액화가스 간 열교환을 수행하여, 상기 액화가스를 과냉각시키는 서브쿨러;
상기 과냉각된 액화가스를 상기 액화가스저장탱크 내부로 회수하는 회수라인;
상기 질소저장탱크로부터 공급받은 액화질소를 가열하여 기화시키는 제1기화기;
상기 질소저장탱크와 제1기화기를 연결하고, 상기 제1기화기에 의해 기화된 유체를 수요처로 공급하는 수요처공급라인;
상기 제1기화기를 바이패스하도록 상기 수요처공급라인의 제1기화기 전단과 후단을 연결하며, 제어밸브를 마련한 바이패스라인; 및
상기 질소저장탱크로부터 공급된 액화질소를 상기 서브쿨러를 거쳐 상기 수요처공급라인의 제1기화기 후단으로 합류시키는 질소가스합류라인;을 포함하되,
상기 제어밸브는 상기 수요처공급라인을 통해 상기 수요처 쪽으로 흘러가는 유체의 온도값을 기초로 개방 정도가 제어되어, 상기 수요처의 온도 요구조건에 맞게 상기 유체의 온도가 조절되도록 하는 선박 저장탱크의 증발가스감소시스템.A subcooler that performs heat exchange between the liquefied nitrogen supplied from the nitrogen storage tank and the liquefied gas supplied from the liquefied gas storage tank, thereby supercooling the liquefied gas;
A recovery line for recovering the supercooled liquefied gas into the liquefied gas storage tank;
a first vaporizer that heats and vaporizes the liquid nitrogen supplied from the nitrogen storage tank;
a demand-side supply line that connects the nitrogen storage tank and the first vaporizer and supplies fluid vaporized by the first vaporizer to the demand side;
A bypass line connecting the front and rear ends of the first vaporizer of the demand supply line to bypass the first vaporizer and provided with a control valve; and
A nitrogen gas confluence line that joins the liquid nitrogen supplied from the nitrogen storage tank to the rear end of the first vaporizer of the demand supply line through the subcooler,
The control valve has an opening degree controlled based on the temperature value of the fluid flowing toward the demander through the demander supply line, so that the temperature of the fluid is adjusted to suit the temperature requirements of the demander. Reduction system. 제1항에 있어서,
상기 회수라인과 상기 액화가스저장탱크의 내측 상부에 마련된 분사라인을 연결하며, 상기 과냉각된 액화가스를 상기 분사라인으로 공급하여 상기 액화가스저장탱크의 내부에 분사되도록 하는 제1연결 라인을 더 포함하는 선박 저장탱크의 증발가스감소시스템.According to paragraph 1,
It connects the recovery line and the injection line provided on the upper inner side of the liquefied gas storage tank, and further includes a first connection line for supplying the supercooled liquefied gas to the injection line so that it is injected into the inside of the liquefied gas storage tank. Evaporative gas reduction system for ship storage tanks. 제2항에 있어서,
상기 액화가스저장탱크와 상기 서브쿨러를 연결하여, 상기 액화가스저장탱크로부터 공급된 액화가스를 상기 서브쿨러로 공급하는 액화가스공급라인과,
상기 액화가스공급라인으로부터 분기되어 상기 분기라인과 연결되며, 상기 액화가스저장탱크로부터 공급된 액화가스 중 적어도 일부를 상기 분사라인으로 공급하는 제2연결라인을 더 포함하는 선박 저장탱크의 증발가스감소시스템.According to paragraph 2,
A liquefied gas supply line connecting the liquefied gas storage tank and the sub-cooler to supply the liquefied gas supplied from the liquefied gas storage tank to the sub-cooler;
Boil-off gas reduction in a ship storage tank further comprising a second connection line branched from the liquefied gas supply line and connected to the branch line, and supplying at least a portion of the liquefied gas supplied from the liquefied gas storage tank to the injection line. system. 제1항에 있어서,
상기 질소저장탱크로부터 공급받은 액화질소를 대기와 열교환하여 기화시키는 제2기화기와,
상기 질소가스합류라인의 서브쿨러 전단과 상기 제2기화기를 연결하며, 상기 제2기화기를 통과한 유체를 상기 질소가스합류라인에 합류시키는 기화가스합류라인과,
상기 질소가스합류라인으로부터 분기되어 상기 질소저장탱크와 연결되며, 상기 질소저장탱크 내부의 압력 조절을 위해 상기 질소가스합류라인을 통해 흘러가는 유체 중 적어도 일부를 상기 질소저장탱크 내측으로 보내는 압력조절라인을 더 포함하는 선박 저장탱크의 증발가스감소시스템.
According to paragraph 1,
a second vaporizer that vaporizes the liquid nitrogen supplied from the nitrogen storage tank by exchanging heat with the atmosphere;
A vaporized gas confluence line connecting the front end of the subcooler of the nitrogen gas confluence line and the second vaporizer, and allowing fluid passing through the second vaporizer to join the nitrogen gas confluence line;
A pressure control line that branches off from the nitrogen gas confluence line and is connected to the nitrogen storage tank, and sends at least a portion of the fluid flowing through the nitrogen gas confluence line to the inside of the nitrogen storage tank to control the pressure inside the nitrogen storage tank. A ship storage tank evaporation gas reduction system further comprising:
KR1020220150370A 2022-11-11 2022-11-11 System for reducing boil off gas of storage tank of ship KR20240069874A (en)

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Citations (1)

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Publication number Priority date Publication date Assignee Title
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Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160086554A (en) 2015-01-12 2016-07-20 삼성중공업 주식회사 Reliquefaction system

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