KR101281636B1 - Vessel - Google Patents

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Publication number
KR101281636B1
KR101281636B1 KR1020110027063A KR20110027063A KR101281636B1 KR 101281636 B1 KR101281636 B1 KR 101281636B1 KR 1020110027063 A KR1020110027063 A KR 1020110027063A KR 20110027063 A KR20110027063 A KR 20110027063A KR 101281636 B1 KR101281636 B1 KR 101281636B1
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KR
South Korea
Prior art keywords
refrigerant
gas
boil
zone
compression unit
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KR1020110027063A
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Korean (ko)
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KR20120109743A (en
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김승혁
이광희
이종철
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삼성중공업 주식회사
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Priority to KR1020110027063A priority Critical patent/KR101281636B1/en
Publication of KR20120109743A publication Critical patent/KR20120109743A/en
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Publication of KR101281636B1 publication Critical patent/KR101281636B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
    • 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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/005—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream with extraction of work
    • 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—Nitrogen
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262—Details of the cold heat exchange system
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • 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
    • F17C2265/03—Treating the boil-off
    • F17C2265/031—Treating the boil-off by discharge
    • 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
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • 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
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

Abstract

본 발명은 선박에 관한 것이다.
본 발명의 일 측면에 따르면, 액화천연가스를 저장하는 저장탱크; 상기 저장탱크에서 공급되는 증발가스를 압축하는 증발가스 압축부; 상기 증발가스 압축부에서 압축된 증발가스를 냉매와 열 교환하여 재액화한 후 과냉시키는 응축기; 상기 응축기를 통과하는 포화상태의 액화천연가스를 고압 가스 분사 엔진으로 공급하는 연료 공급 라인; 상기 연료 공급 라인에 제공되며 포화상태의 액화천연가스를 압축하는 펌프; 및 상기 펌프에서 압축된 액화천연가스를 기화시키는 기화기를 포함하는 선박을 제공할 수 있다.The present invention relates to a ship.
According to an aspect of the invention, the storage tank for storing the liquefied natural gas; An evaporative gas compression unit configured to compress the evaporated gas supplied from the storage tank; A condenser for supercooling after re-liquefying the boil-off gas compressed by the boil-off gas compression unit with a refrigerant; A fuel supply line for supplying a saturated liquefied natural gas passing through the condenser to a high pressure gas injection engine; A pump which is provided to the fuel supply line and compresses the saturated LNG; And it can provide a vessel comprising a vaporizer for vaporizing the liquefied natural gas compressed in the pump.

Description

선박{Vessel}Vessel {Vessel}

본 발명은 선박에 관한 것이다.
The present invention relates to a ship.

액화천연가스(Liquefied Natural Gas, 이하 "LNG"라 함)는 메탄(methane)을 주성분으로 하는 천연가스(Natural Gas, 이하 "NG"라 함)를 약 -162?로 냉각해서 액화시킴으로써 얻을 수 있는 무색투명한 액체로서, NG와 비교해 약 1/600 정도의 부피를 갖는다. 따라서, NG의 이송 시 LNG로 액화시켜 이송할 경우 매우 효율적으로 이송할 수 있으며, 일 예로 LNG를 해상으로 수송(운반)할 수 있는 LNG 운반선이 사용되고 있다.Liquefied Natural Gas (hereinafter referred to as "LNG") is obtained by cooling and liquefying natural gas (Natural Gas, hereinafter referred to as "NG") containing methane to about -162 ° C. Colorless, transparent liquid with a volume of about 1/600 compared to NG. Therefore, when liquefied and transported to LNG during the transfer of NG can be very efficiently transported, for example, an LNG carrier that can transport (transport) LNG to the sea is used.

LNG의 수송 시, LNG가 저장되는 저장탱크는 외부로부터 지속적으로 열을 받기 때문에, 저장탱크 내의 LNG는 온도가 높아지고, 그에 따라 기화될 수 있다. 이를 증발가스(Boil-Off Gas, 이하 "BOG"라 함)라 한다.During the transport of LNG, since the storage tank in which the LNG is stored receives heat continuously from the outside, the LNG in the storage tank becomes hot and can be vaporized accordingly. This is called a boil-off gas (hereinafter referred to as "BOG").

BOG는 일종의 LNG 손실로서 LNG의 수송에 있어서 중요한 문제이다. 또한, BOG가 저장탱크 내에 누적되어 저장탱크 내의 압력이 높아지면 저장탱크가 파손될 위험성도 있다. 따라서, BOG를 처리하기 위한 다양한 방법이 연구되어 왔으며, BOG를 재액화하여 저장탱크로 복귀시키는 방법, BOG를 선박의 엔진의 에너지원으로 사용하는 방법 등이 사용되고 있다.BOG is a type of LNG loss and is an important issue in the transportation of LNG. In addition, there is a risk that the storage tank is damaged if the BOG accumulates in the storage tank and the pressure in the storage tank is increased. Therefore, various methods for treating the BOG have been studied, a method of reliquefying the BOG to return to the storage tank, a method of using the BOG as an energy source of the engine of the ship, and the like.

최근에는 LNG 운반선에는 저장탱크에 저장된 LNG를 고압으로 압축한 후 기화시킨 NG를 연료로 사용하는 고압 가스 분사 엔진이 사용되고 있다. 상세히, 저장탱크에서 발생되는 BOG는 재액화 장치에서 LNG로 응축되고, 응축된 LNG의 일부는 고압 가스 분사 엔진의 연료로 공급되고 나머지는 저장탱크로 복귀할 수 있다. 이때, 재액화장치는 LNG의 저장탱크 복귀 시 플래쉬 가스(flash gas)의 발생을 최소화하기 위해 LNG를 과냉시킨다.Recently, high pressure gas injection engines are used for LNG carriers by using LNG stored in a storage tank at high pressure and then vaporizing NG as fuel. In detail, the BOG generated in the storage tank may be condensed into LNG in the reliquefaction apparatus, a portion of the condensed LNG may be supplied to the fuel of the high pressure gas injection engine, and the rest may be returned to the storage tank. At this time, the reliquefaction apparatus supercools the LNG in order to minimize the generation of flash gas when the LNG returns to the storage tank.

그러나, 상기와 같은 종래 기술은 다음과 같은 문제가 있다.However, the above prior art has the following problems.

고압 가스 분사 엔진의 연료로 사용되는 LNG는 고압으로 압축된 후 기화되는 과정을 거치게 된다. 따라서, 고압 가스 분사 엔진의 연료로 사용되는 LNG는 과냉될 필요가 없다. 즉, 재액화 장치는 고압 가스 분사 엔진의 연료로 사용될 LNG까지 불필요하게 과냉시키므로, 에너지를 낭비하고 있다.
LNG, used as fuel for high-pressure gas injection engines, is compressed to high pressure and then vaporized. Therefore, LNG used as fuel of the high pressure gas injection engine does not need to be supercooled. In other words, the reliquefaction apparatus unnecessarily supercools the LNG to be used as the fuel of the high-pressure gas injection engine, thus wasting energy.

본 발명의 실시예들은 에너지를 절약할 수 있는 선박을 제공하고자 한다.
Embodiments of the present invention seek to provide a vessel that can save energy.

본 발명의 일 측면에 따르면, 액화천연가스를 저장하는 저장탱크; 상기 저장탱크에서 공급되는 증발가스를 압축하는 증발가스 압축부; 상기 증발가스 압축부에서 압축된 증발가스를 냉매와 열 교환하여 재액화한 후 과냉시키는 응축기; 상기 응축기를 통과하는 포화상태의 액화천연가스를 고압 가스 분사 엔진으로 공급하는 연료 공급 라인; 상기 연료 공급 라인에 제공되며 포화상태의 액화천연가스를 압축하는 펌프; 및 상기 펌프에서 압축된 액화천연가스를 기화시키는 기화기를 포함하는 선박을 제공할 수 있다.According to an aspect of the invention, the storage tank for storing the liquefied natural gas; An evaporative gas compression unit configured to compress the evaporated gas supplied from the storage tank; A condenser for supercooling after re-liquefying the boil-off gas compressed by the boil-off gas compression unit with a refrigerant; A fuel supply line for supplying a saturated liquefied natural gas passing through the condenser to a high pressure gas injection engine; A pump which is provided to the fuel supply line and compresses the saturated LNG; And it can provide a vessel comprising a vaporizer for vaporizing the liquefied natural gas compressed in the pump.

또한, 상기 증발가스 압축부에서 압축된 증발가스와 상기 증발가스 압축부를 통과하기 전의 증발가스를 열 교환하여 상기 증발가스 압축부에서 압축된 증발가스를 냉각시키는 열교환기를 더 포함하는 것을 특징으로 하는 선박을 제공할 수 있다.The ship further comprising a heat exchanger for cooling the boil-off gas compressed by the boil-off gas compression unit by heat-exchanging the boil-off gas compressed by the boil-off gas compression unit and the boil-off gas before passing through the boil-off gas compression unit. Can be provided.

또한, 상기 응축기는, 냉매를 압축하는 냉매 압축부와, 냉매를 팽창시켜 냉매의 온도를 낮추는 팽창기가 연결되는 것을 특징으로 하는 선박을 제공할 수 있다.In addition, the condenser may provide a vessel characterized in that the refrigerant compression unit for compressing the refrigerant and the expander for expanding the refrigerant to lower the temperature of the refrigerant is connected.

또한, 상기 응축기는, 증발가스가 재액화된 후 과냉되는 제 1 구역; 상기 증발가스에 냉열을 제공하는 냉매가 통과하는 제 2 구역; 및 상기 냉매 압축부에서 제공되는 냉매가 통과되는 제 3 구역을 포함하고, 상기 제 3 구역을 통과하는 냉매는 상기 제 2 구역을 통과하는 냉매에 의해 냉각되는 것을 특징으로 하는 선박을 제공할 수 있다.The condenser may also include a first zone in which the boil-off gas is subcooled after being re-liquefied; A second zone through which a refrigerant providing cold heat to the boil-off gas passes; And a third zone through which the refrigerant provided by the refrigerant compression unit passes, wherein the refrigerant passing through the third zone is cooled by the refrigerant passing through the second zone. .

또한, 상기 제 2 구역과 상기 제 3 구역을 연결하며, 상기 제 3 구역을 통과하는 냉매의 일부가 유입되는 바이패스 라인이 더 포함되고, 상기 바이패스 라인에는 냉매를 감압시켜 온도를 낮추는 감압 밸브가 제공되는 것을 특징으로 하는 선박을 제공할 수 있다. In addition, a bypass line connecting the second zone and the third zone, wherein a portion of the refrigerant passing through the third zone is introduced, and the pressure reducing valve lowers the temperature by reducing the refrigerant. It can provide a ship characterized in that provided.

또한, 상기 제 1 구역을 흐르는 액화천연가스는 상기 감압 밸브에 의해 온도가 낮아진 냉매와 열교환하여 과냉되는 것을 특징으로 하는 선박을 제공할 수 있다.In addition, the liquefied natural gas flowing through the first zone may provide a vessel, characterized in that the cooling by heat exchange with the refrigerant having a lower temperature by the pressure reducing valve.

또한, 상기 기화기의 전단에는 액화천연가스를 가열하는 프리히터가 더 제공되고, 상기 프리히터는 상기 냉매 압축부를 통과한 냉매를 가열원으로 사용하는 것을 특징으로 하는 선박을 제공할 수 있다.
In addition, a preheater for heating the liquefied natural gas may be further provided at the front end of the vaporizer, and the preheater may provide a ship comprising a refrigerant passing through the refrigerant compression unit as a heating source.

본 발명의 실시예에 따른 선박에 의하면, 고압 가스 분사 엔진의 연료로 사용될 액화천연가스를 불필요하게 과냉시키지 않으므로 에너지를 절약할 수 있다.
According to the ship according to the embodiment of the present invention, the liquefied natural gas to be used as the fuel of the high-pressure gas injection engine does not unnecessarily supercool, it is possible to save energy.

도 1은 본 발명의 제 1 실시예에 따른 선박의 구조를 개략적으로 보여주는 도면.
도 2는 본 발명의 제 2 실시예에 따른 선박의 구조를 개략적으로 보여주는 도면.1 is a view schematically showing the structure of a ship according to a first embodiment of the present invention.
2 is a view schematically showing the structure of a ship according to a second embodiment of the present invention.

이하에서는 본 발명의 사상을 구현하기 위한 구체적인 실시예에 대하여 도면을 참조하여 상세히 설명하도록 한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

아울러 본 발명을 설명함에 있어서, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략한다.In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

도 1은 본 발명의 제 1 실시예에 따른 선박의 구조를 개략적으로 보여주는 도면이다.1 is a view schematically showing the structure of a ship according to a first embodiment of the present invention.

도 1을 참조하면, 본 발명의 제 1 실시예에 따른 선박(100)에는 액화천연가스(Liquefied Natural Gas, 이하 "LNG"라 함)가 저장되는 저장탱크(110), 상기 저장탱크(110)에서 발생된 증발가스(Boiled-Off Gas, 이하 "BOG"라 함)를 압축하는 증발가스 압축부(130), 상기 증발가스 압축부(130)의 전단에 배치되며 압축된 BOG를 냉각시키는 열교환기(120), BOG를 냉매와 열교환하여 LNG로 재액화시키는 응축기(140), 상기 응축기(140)로 공급되는 냉매를 압축하는 냉매 압축부(150), 냉매를 팽창시켜 온도를 낮추는 팽창기(160), 냉매를 팽창시켜 압력을 낮추는 감압 밸브(170), 상기 응축기(140)에서 재액화된 LNG의 일부를 고압으로 가압하는 펌프(180), 고압의 LNG를 천연가스(Natural Gas, 이하 "NG"라 함)로 기화시키는 기화기(190), 상기 기화기(190)로부터 고압의 NG를 공급받아 상기 선박(100)을 추진하는 추진력을 발생시키는 고압 가스 분사 엔진(200)을 포함할 수 있다.Referring to FIG. 1, the vessel 100 according to the first embodiment of the present invention includes a storage tank 110 in which liquefied natural gas (Liquefied Natural Gas, hereinafter referred to as "LNG") is stored, and the storage tank 110. Evaporation gas compression unit 130 for compressing the boiled-off gas (Boiled-Off Gas, hereinafter referred to as "BOG"), heat exchanger disposed in front of the boil-off gas compression unit 130 to cool the compressed BOG 120, a condenser 140 for exchanging BOG with the refrigerant to reliquefy into LNG, a refrigerant compression unit 150 for compressing the refrigerant supplied to the condenser 140, an expander 160 for expanding the refrigerant to lower the temperature, Pressure reducing valve 170 for lowering the pressure by expanding the refrigerant, pump 180 for pressurizing a portion of the LNG liquefied in the condenser 140 at high pressure, LNG at high pressure is referred to as natural gas (hereinafter referred to as "NG"). Vaporizer 190 for vaporizing the gas, the high pressure NG is supplied from the vaporizer 190 to propel the vessel 100 To generate a translational force may include a high-pressure gas injection engine 200.

상기 저장탱크(110)와 상기 열교환기(120)와 상기 증발가스 압축부(130) 및 상기 응축기(140)는 재액화 라인(101)에 의해 연결될 수 있다. 그리고, 상기 펌프(180)와 상기 기화기(190)는 상기 재액화 라인(101)으로부터 분기되어 상기 고압 가스 분사 엔진(200)까지 연장되는 연료 공급 라인(102)에 의해 연결될 수 있다. 또한, 상기 응축기(140)와 상기 냉매 압축부(150) 및 상기 팽창기(160)는 냉매 라인(103)으로 연결될 수 있으며, 상기 냉매 라인(103)에는 냉매의 일부가 상기 팽창기(160)를 통과하지 않고 상기 감압 밸브(170)를 통과하도록 형성되는 바이패스 라인(104)이 연결될 수 있다.The storage tank 110, the heat exchanger 120, the boil-off gas compressor 130, and the condenser 140 may be connected by a reliquefaction line 101. In addition, the pump 180 and the vaporizer 190 may be connected by a fuel supply line 102 branching from the reliquefaction line 101 and extending to the high pressure gas injection engine 200. In addition, the condenser 140, the refrigerant compression unit 150, and the expander 160 may be connected to the refrigerant line 103, and a portion of the refrigerant may pass through the expander 160 in the refrigerant line 103. The bypass line 104 is formed so as to pass through the pressure reducing valve 170 may be connected.

상기 선박(100)은 LNGC(liquefied natural gas carrier), LNG RV(liquefied natural gas regasification vessel), LNG FSRU(liquefied natural gas floating storage and regasification unit), LNG FPSO(liquefied natural gas floating, production, storage and off-loading) 중 어느 하나일 수 있으며, LNG를 저장하여 해상을 운항할 수 있는 임의의 선박일 수 있다. 본 실시예에서, 상기 선박(100)은 LNGC인 것을 예로 들어 설명하겠다. The vessel 100 includes a liquefied natural gas carrier (LNGC), a liquefied natural gas regasification vessel (LNG RV), an liquefied natural gas floating storage and regasification unit (LFSF), and a liquefied natural gas floating, LNG FPSO (production, storage and off) -loading), and may be any vessel capable of operating the sea by storing LNG. In this embodiment, the vessel 100 will be described taking as an example LNGC.

상기 저장탱크(110)는 상기 선박(100)의 선체(미도시)에 설치되며, LNG가 액체 상태를 유지할 수 있도록 일정 수준 이상의 단열 성능을 갖도록 형성된다. 그러나, 외부로부터 전달되는 열을 완전히 차단할 수는 없으므로, 상기 저장탱크(110)에서는 BOG가 발생된다.The storage tank 110 is installed on the hull (not shown) of the vessel 100, and is formed to have a heat insulating performance of a predetermined level or more so that LNG can maintain a liquid state. However, since the heat transmitted from the outside cannot be completely blocked, BOG is generated in the storage tank 110.

상기 저장탱크(110)에서 발생된 BOG는 상기 재액화 라인(101)을 따라 이동하며 상기 열교환기(120)에서 가열된 후 상기 증발가스 압축부(130)에서 압축되고, 상기 응축기(140)에서 LNG로 재액화된다. 상기 응축기(140)에서 재액화된 LNG의 일부는 상기 고압 가스 분사 엔진(200)의 연료로 공급되고, 나머지 일부는 상기 저장탱크(110)로 회수될 수 있다.BOG generated in the storage tank 110 is moved along the reliquefaction line 101 and heated in the heat exchanger 120 and then compressed in the boil-off gas compression unit 130, in the condenser 140 Reliquefy with LNG. A portion of the LNG liquefied by the condenser 140 may be supplied as a fuel of the high-pressure gas injection engine 200, and a portion of the LNG may be recovered to the storage tank 110.

상세히, 상기 열교환기(120)는 상기 저장탱크(110)에서 공급되는 BOG와 상기 증발가스 압축부(130)에서 압축되어 온도가 높아진 BOG를 열 교환함으로써, 상기 증발가스 압축부(130)에서 압축된 BOG가 상기 응축기(140)로 공급되기 전에 미리 냉각될 수 있도록 한다. 즉, 상기 열교환기(120)에서 상기 저장탱크(110)로부터 공급되는 BOG는 온도가 높아지고, 상기 증발가스 압축부(130)에서 압축되어 온도가 높아진 BOG는 온도가 낮아진다. In detail, the heat exchanger 120 heat-compresses the BOG supplied from the storage tank 110 and the BOG compressed in the boil-off gas compression unit 130 to increase in temperature, thereby compressing in the boil-off gas compression unit 130. BOG can be cooled before it is supplied to the condenser 140. That is, the BOG supplied from the storage tank 110 in the heat exchanger 120 increases in temperature, and the BOG compressed in the boil-off gas compression unit 130 increases in temperature.

상기 증발가스 압축부(130)는 상기 열교환기(120)에서 미리 가열된 BOG를 다단 압축할 수 있도록 다수 개의 압축기(131)를 포함할 수 있으며, 상기 응축기(140)의 부하를 줄이기 위해 각각의 상기 압축기(131)의 후단에는 BOG를 냉각하기 위한 냉각기(133)가 배치될 수 있다. 상기 냉각기(133)는 해수 또는 청수를 냉열원으로 사용하는 열교환기일 수 있다. The boil-off gas compressor 130 may include a plurality of compressors 131 to compress BOG preheated by the heat exchanger 120 in multiple stages, and to reduce the load of the condenser 140. A cooler 133 for cooling the BOG may be disposed at the rear end of the compressor 131. The cooler 133 may be a heat exchanger using seawater or fresh water as a cold heat source.

상기 열교환기(120)에서 냉각된 BOG는 상기 재액화 라인(101)을 따라 상기 응축기(140)로 공급되며, 상기 응축기(140)에서 LNG로 재액화된다. 아울러, 상기 재액화 라인(101)은 상기 응축기(140)를 통과하여 상기 저장탱크(110)까지 연장된다.The BOG cooled in the heat exchanger 120 is supplied to the condenser 140 along the reliquefaction line 101 and reliquefied into LNG in the condenser 140. In addition, the reliquefaction line 101 extends through the condenser 140 to the storage tank 110.

상기 응축기(140)는 냉매와 BOG를 열교환함으로써 BOG를 LNG로 재액화시킨다. 상기 응축기(140)는 상기 냉매 압축부(150) 및 상기 팽창기(160)와 연결되며, 상기 냉매 라인(103)이 통과되도록 구성된다. The condenser 140 reliquefies the BOG to LNG by heat-exchanging the refrigerant and the BOG. The condenser 140 is connected to the refrigerant compression unit 150 and the expander 160 and configured to pass through the refrigerant line 103.

상세히, 상기 응축기(140)는 BOG가 통과하며 재액화되는 제 1 구역(141), 상기 제 1 구역(141)의 BOG를 냉각하기 위한 냉매가 흐르는 제 2 구역(142), 상기 냉매 압축부(150)에서 압축된 냉매가 상기 팽창기(160)로 유입되기 전에 미리 냉각되도록 통과하는 제 3 구역(143)을 포함할 수 있다. 상기 제 1, 2, 3 구역(141, 142, 143)은 물리적으로 독립된 공간일 수 있으며, 각 구역 사이의 열 교환이 가능하도록 구성된다.In detail, the condenser 140 may include a first zone 141 through which BOG passes and re-liquefy, a second zone 142 through which a refrigerant for cooling the BOG of the first zone 141 flows, and the refrigerant compression unit ( The refrigerant compressed in 150 may include a third zone 143 that passes through the refrigerant to be cooled before being introduced into the expander 160. The first, second, and third zones 141, 142, and 143 may be physically independent spaces, and are configured to allow heat exchange between the zones.

BOG를 재액화시키는 냉매로는 질소 등 비활성 기체가 사용될 수 있으며, 본 실시예에서는 질소가 냉매로 사용되는 것을 예로 설명하겠다.An inert gas such as nitrogen may be used as the refrigerant for reliquefaction of the BOG, and in this embodiment, nitrogen is used as the refrigerant.

냉매는 상기 냉매 라인(103)을 따라 흐르며, 상기 냉매 압축부(150)에서 압축된다. 상기 냉매 압축부(150)는 냉매를 다단 압축할 수 있도록 다수 개의 압축기(151)를 포함할 수 있으며, 압축에 의해 냉매의 온도가 높아지는 것을 방지하기 위해 각 압축기(151)의 후단에는 냉매를 냉각하기 위한 냉각기(153)가 배치될 수 있다.The refrigerant flows along the refrigerant line 103 and is compressed by the refrigerant compression unit 150. The refrigerant compression unit 150 may include a plurality of compressors 151 to compress the refrigerant in multiple stages. In order to prevent the temperature of the refrigerant from being increased by the compression, the refrigerant compression unit 150 cools the refrigerant. The cooler 153 may be disposed.

상기 냉매 압축부(150)를 통과한 냉매는 상기 냉매 라인(103)을 따라 상기 제 3 구역(143)으로 유입될 수 있다. 냉매는 상기 제 3 구역(143)을 통과하며 상기 제 2 구역(142)을 통과하는 냉매에 의해 상기 팽창기(160)의 작동에 적합한 온도로 냉각될 수 있다.The refrigerant passing through the refrigerant compression unit 150 may flow into the third zone 143 along the refrigerant line 103. The refrigerant may be cooled to a temperature suitable for operation of the expander 160 by the refrigerant passing through the third zone 143 and passing through the second zone 142.

상기 냉매 라인(103)은 상기 제 3 구역(143)으로부터 상기 팽창기(160)로 연장되며, 냉매는 상기 팽창기(160)를 통과하며 BOG를 재액화시킬 수 있을 정도의 극저온이 될 수 있다. The coolant line 103 extends from the third zone 143 to the expander 160, and the coolant passes through the expander 160 and may be cryogenic enough to re-liquefy BOG.

상기 팽창기(160)에서 배출되는 냉매는 상기 냉매 라인(103)을 따라 상기 제 2 구역(142)으로 유입되어 상기 응축기(140)를 통과한다. 상기 제 2 구역(142)을 통과하는 냉매는 상기 재응축 라인(101)을 통과하는 BOG로부터 열을 빼앗아 BOG를 LNG로 재액화시키고, 상기 제 3 구역(143)을 통과하는 냉매로부터 열을 빼앗아 냉매의 온도를 낮출 수 있다. The refrigerant discharged from the expander 160 flows into the second zone 142 along the refrigerant line 103 and passes through the condenser 140. The refrigerant passing through the second zone 142 takes heat away from the BOG passing through the recondensation line 101 to reliquefy the BOG into LNG and takes heat away from the refrigerant passing through the third zone 143. It is possible to lower the temperature of the refrigerant.

상기 제 2 구역(142)에서 배출되는 냉매는 상기 냉매 라인(103)을 따라 상기 냉매 압축부(150)로 다시 유입됨으로써 상기 냉매 라인(103)을 순환한다.The refrigerant discharged from the second zone 142 circulates through the refrigerant line 103 by flowing back into the refrigerant compression unit 150 along the refrigerant line 103.

한편, 상기 제 3 구역(143)을 통과하는 상기 냉매 라인(103)의 일 지점에는 상기 바이패스 라인(104)이 제공될 수 있다. 상기 바이패스 라인(104)은 냉매가 상기 팽창기(160)를 통과하지 않고 냉각될 수 있도록 냉매를 상기 감압 밸브(170)로 안내한다. 그리고, 상기 바이패스 라인(104)은 상기 감압 밸브(170)를 통과하며 온도가 낮아진 냉매가 상기 제 2 구역(142)에서 상기 냉매 라인(103)을 통과하는 냉매와 합류하도록 상기 제 2 구역(142)을 통과하는 상기 냉매 라인(103)에 연결될 수 있다. 즉, 상기 바이패스 라인(104)은 상기 제 3 구역(143)과 상기 제 2 구역(142)을 연결할 수 있다.Meanwhile, the bypass line 104 may be provided at one point of the refrigerant line 103 passing through the third zone 143. The bypass line 104 guides the refrigerant to the pressure reducing valve 170 so that the refrigerant can be cooled without passing through the expander 160. The bypass line 104 passes through the pressure reducing valve 170 and the refrigerant having a lower temperature merges with the refrigerant passing through the refrigerant line 103 in the second zone 142. 142 may be connected to the refrigerant line 103 passing through 142. That is, the bypass line 104 may connect the third zone 143 and the second zone 142.

상세히, 상기 제 3 구역(143)을 통과하는 상기 냉매 라인(103)으로부터 상기 바이패스 라인(104)으로 분기된 냉매는 상기 감압 밸브(170)를 통과하며 줄-톰슨 효과(Joule-Thomson Effect)에 의해 온도가 낮아질 수 있다. 이때, 상기 감압 밸브(170)는 상기 감압 밸브(170)를 통과한 냉매의 온도가 재액화된 LNG를 과냉시킬 수 있을 정도의 온도가 되도록 제공될 수 있다. In detail, the refrigerant branched from the refrigerant line 103 passing through the third zone 143 to the bypass line 104 passes through the pressure reducing valve 170 and the Joule-Thomson Effect. The temperature can be lowered by. In this case, the pressure reducing valve 170 may be provided such that the temperature of the refrigerant passing through the pressure reducing valve 170 is such that it can supercool the reliquefied LNG.

한편, 상기 연료 공급 라인(102)은 상기 제 1 구역(141)를 통과하는 상기 재액화 라인(101)으로부터 분기될 수 있다. 이때, 상기 연료 공급 라인(102)은 상기 재액화 라인(101)을 흐르는 BOG가 LNG로 상변화 하는 포화영역과, LNG로 상변화한 후 과냉되는 영역의 경계 또는 경계와 인접한 위치에 연결될 수 있다. 즉, 상기 연료 공급 라인(102)으로 제공되는 LNG는 포화상태이거나, 포화상태에서 과냉상태에 진입한 직후의 상태일 수 있다. 본 실시예에서는 포화상태의 LNG가 상기 연료 공급 라인(102)으로 제공되는 것을 예로 설명하겠다.Meanwhile, the fuel supply line 102 may branch from the reliquefaction line 101 passing through the first zone 141. In this case, the fuel supply line 102 may be connected to a saturation region in which the BOG flowing through the reliquefaction line 101 phase-changes to LNG, and a position adjacent to the boundary or boundary of the region to be supercooled after phase-change to LNG. . That is, the LNG provided to the fuel supply line 102 may be saturated or immediately after entering the supercooled state from the saturated state. In this embodiment, the saturated LNG is provided to the fuel supply line 102 by way of example.

이에 의해, 상기 연료 공급 라인(102)으로는 과냉되지 않은 LNG가 제공될 수 있다. 또한, 상변화된 LNG는 상기 재액화 라인(101)을 따라 계속 이동하며 상기 바이패스 라인(104)의 냉매 또는 상기 냉매 라인(103)의 냉매와 열교환 하여 과냉된 후 상기 저장탱크(110)로 공급될 수 있다. As a result, LNG which is not supercooled may be provided to the fuel supply line 102. In addition, the phase-changed LNG continues to move along the reliquefaction line 101 and is superheated by exchanging heat with the refrigerant of the bypass line 104 or the refrigerant of the refrigerant line 103, and then supplying the LNG to the storage tank 110. Can be.

예를 들면, 상기 재액화 라인(101)을 흐르는 LNG를 과냉시키는 것은 상기 바이패스 라인(104)을 흐르는 냉매일 수 있다. 상세히, 상기 제 1 구역(141)을 통과하는 상기 재액화 라인(101)에서, BOG가 포화상태의 LNG가 될 때까지는 상기 냉매 라인(103)을 흐르는 냉매로 열을 빼앗기고, 포화상태의 LNG가 된 후 과냉될 때에는 상기 바이패스 라인(104)을 흐르는 냉매에 열을 빼앗길 수 있다.For example, supercooling the LNG flowing through the reliquefaction line 101 may be a refrigerant flowing through the bypass line 104. In detail, in the reliquefaction line 101 passing through the first zone 141, heat is lost to the refrigerant flowing through the refrigerant line 103 until BOG becomes saturated LNG, and saturated LNG is After the overcooling, the heat may be deprived of the refrigerant flowing through the bypass line 104.

상기 연료 공급 라인(102)에는 상기 제 1 구역(141)으로부터 공급되는 LNG를 고압으로 압축하는 상기 펌프(180)와, 압축된 LNG를 NG로 기화시켜 상기 고압 가스 분사 엔진(200)으로 공급하는 상기 기화기(190)가 순차적으로 배치될 수 있다.The fuel supply line 102, the pump 180 for compressing the LNG supplied from the first zone 141 to a high pressure, and the compressed LNG to NG to supply to the high-pressure gas injection engine 200 The vaporizer 190 may be disposed sequentially.

또한, 상기 연료 공급 라인(102)에는 상기 펌프(180)로 LNG만 공급될 수 있도록 LNG 를 분리할 수 있는 기액분리기(미도시)가 더 제공될 수 있다.In addition, the fuel supply line 102 may be further provided with a gas-liquid separator (not shown) capable of separating LNG so that only LNG can be supplied to the pump 180.

상기와 같은 구성을 갖는 본 발명의 제 1 실시예에 따른 선박(100)에 의하면, 상기 저장탱크(110)에서 발생되는 BOG는 상기 재액화 라인(101)을 따라 상기 응축기(140)를 통과하며 LNG로 재액화되고, 과냉된 후 상기 저장탱크(110)로 회수될 수 있다. According to the ship 100 according to the first embodiment of the present invention having the configuration as described above, the BOG generated in the storage tank 110 passes through the condenser 140 along the reliquefaction line 101 Re-liquefied with LNG, it can be recovered to the storage tank 110 after being subcooled.

이때, 상기 응축기(140)에서 과냉되기 전의 포화상태의 LNG의 일부는 상기 연료 공급 라인(102)으로 공급되며, 상기 펌프(180) 및 상기 기화기(190)를 통과하여 상기 고압 가스 분사 엔진(200)으로 제공된다.In this case, a portion of the LNG in a saturated state before being subcooled in the condenser 140 is supplied to the fuel supply line 102, and passes through the pump 180 and the vaporizer 190 to the high pressure gas injection engine 200. Is provided.

즉, 상기 응축기(140)에서 LNG를 온도가 더 낮은 상태인 과냉상태가 되기 전에 추출함으로써, 상기 기화기(190)에 투입되어야 할 열량을 줄일 수 있으므로, 상기 기화기(190)의 에너지 소비를 줄일 수 있다. 따라서, 상기 선박(100)의 에너지 사용량을 절약할 수 있다.That is, by extracting the LNG from the condenser 140 before the supercooled state at a lower temperature, the amount of heat to be injected into the vaporizer 190 can be reduced, thereby reducing energy consumption of the vaporizer 190. have. Therefore, the energy consumption of the vessel 100 can be saved.

또한, 상기 응축기(140)로 공급되는 냉매의 일부를 에너지 소비가 필요없는 상기 감압 밸브(170)를 통과시켜 온도를 낮추고, 이를 LNG의 과냉에 이용함으로써 BOG의 재액화에 필요한 에너지도 줄일 수 있다. In addition, a portion of the refrigerant supplied to the condenser 140 is passed through the pressure reducing valve 170, which does not require energy consumption, to lower the temperature, and by using the same for subcooling of LNG, energy required for reliquefaction of the BOG may be reduced. .

이하에서는 본 발명의 제 2 실시예에 따른 선박에 대하여 도 2를 참조하여 설명한다. 다만, 제 2 실시예는 제 1 실시예와 비교하여 프리히터가 더 제공되는 점에 있어서 차이가 있으므로, 차이점을 위주로 설명하며 동일한 부분에 대하여는 제 1 실시예의 설명과 도면 부호를 원용한다.Hereinafter, a ship according to a second embodiment of the present invention will be described with reference to FIG. 2. However, since the second embodiment has a difference in that a preheater is further provided as compared with the first embodiment, the difference will be mainly described, and the same reference numerals and description will be used for the same parts.

도 2는 본 발명의 제 2 실시예에 따른 선박의 구조를 개략적으로 보여주는 도면이다.2 is a view schematically showing the structure of a ship according to a second embodiment of the present invention.

도 2를 참조하면, 본 발명의 제 2 실시예에 따른 선박(100')은 상기 연료 공급 라인(102)에 설치되는 프리히터(210)를 더 포함할 수 있다. 상기 프리히터(210)는 상기 펌프(180)와 상기 기화기(190)의 사이에 배치될 수 있으며, 상기 펌프(180)에서 압축된 LNG를 상기 기화기(190)에 공급하기 전에 미리 가열한다. Referring to FIG. 2, the ship 100 ′ according to the second embodiment of the present invention may further include a preheater 210 installed in the fuel supply line 102. The preheater 210 may be disposed between the pump 180 and the vaporizer 190, and is preheated before supplying the LNG compressed by the pump 180 to the vaporizer 190.

상기 프리히터(210)의 열원으로는 상기 냉매 압축부(150)를 통과한 냉매가 사용될 수 있으며, 이를 위해 상기 냉매 라인(103)에는 분기 라인(103')이 연결될 수 있다. 상기 분기 라인(103')은 상기 냉매 압축부(150)와 상기 제 3 구역(143)의 사이의 어느 지점으로부터 연장되어 상기 프리히터(210)를 통과해 상기 제 3 구역(143)과 상기 팽창기(160)의 사이의 어느 지점으로 연결될 수 있다.As the heat source of the preheater 210, a refrigerant having passed through the refrigerant compression unit 150 may be used. For this purpose, a branch line 103 ′ may be connected to the refrigerant line 103. The branch line 103 ′ extends from a point between the refrigerant compressor 150 and the third zone 143 to pass through the preheater 210 to the third zone 143 and the expander. It may be connected to any point between the 160.

이와 같이 상기 기화기(190)의 전단에 상기 프리히터(210)를 배치함으로써, 상기 기화기(190)에 공급되어야 할 열량을 줄일 수 있으므로, 상기 선박(100')의 에너지 소비를 줄일 수 있다.As such, by arranging the preheater 210 in front of the vaporizer 190, the amount of heat to be supplied to the vaporizer 190 may be reduced, thereby reducing energy consumption of the vessel 100 ′.

이상 본 발명의 실시예에 따른 선박의 구체적인 실시 형태로서 설명하였으나, 이는 예시에 불과한 것으로서, 본 발명은 이에 한정되지 않는 것이며, 본 명세서에 개시된 기초 사상에 따르는 최광의 범위를 갖는 것으로 해석되어야 한다. 당업자는 개시된 실시형태들을 조합/치환하여 적시되지 않은 형상의 패턴을 실시할 수 있으나, 이 역시 본 발명의 범위를 벗어나지 않는 것이다. 이외에도 당업자는 본 명세서에 기초하여 개시된 실시형태를 용이하게 변경 또는 변형할 수 있으며, 이러한 변경 또는 변형도 본 발명의 권리범위에 속함은 명백하다.
As described above as a specific embodiment of the ship according to the embodiment of the present invention, but this is only an example, the present invention is not limited to this, it should be interpreted as having the broadest range in accordance with the basic idea disclosed herein. Skilled artisans may implement a pattern of features that are not described in a combinatorial and / or permutational manner with the disclosed embodiments, but this is not to depart from the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

100, 100' : 선박 110 : 저장탱크
120 : 열교환기 130 : 증발가스 압축부
140 : 응축기 150 : 냉매 압축부
160 : 팽창기 170 : 감압 밸브
180 : 펌프 190 : 기화기
200 : 고압 가스 분사 엔진 101 : 재액화 라인
102 : 연료 공급 라인 103 : 냉매 라인
104 : 바이패스 라인 103' : 분기 라인
210 : 프리히터100, 100 ': Vessel 110: storage tank
120: heat exchanger 130: evaporation gas compression unit
140: condenser 150: refrigerant compression unit
160: Inflator 170: Pressure Reducing Valve
180: pump 190: carburetor
200: high pressure gas injection engine 101: reliquefaction line
102: fuel supply line 103: refrigerant line
104: bypass line 103 ': branch line
210: preheater

Claims (7)

액화천연가스를 저장하는 저장탱크; 상기 저장탱크에서 공급되는 증발가스를 압축하는 증발가스 압축부; 상기 증발가스 압축부에서 압축된 증발가스를 냉매와 열 교환하여 재액화한 후 과냉시키는 응축기; 상기 응축기를 통과하는 포화상태의 액화천연가스를 고압 가스 분사 엔진으로 공급하는 연료 공급 라인; 상기 연료 공급 라인에 제공되며 포화상태의 액화천연가스를 압축하는 펌프; 및 상기 펌프에서 압축된 액화천연가스를 기화시키는 기화기를 포함하고,
상기 응축기는, 냉매를 압축하는 냉매 압축부와, 냉매를 팽창시켜 냉매의 온도를 낮추는 팽창기가 연결되고,
상기 응축기는, 증발가스가 재액화된 후 과냉되는 제 1 구역; 상기 증발가스에 냉열을 제공하는 냉매가 통과하는 제 2 구역; 및 상기 냉매 압축부에서 제공되는 냉매가 통과되는 제 3 구역을 포함하고,
상기 제 3 구역을 통과하는 냉매는 상기 제 2 구역을 통과하는 냉매에 의해 냉각되는 것을 특징으로 하는 선박.
A storage tank for storing liquefied natural gas; An evaporative gas compression unit configured to compress the evaporated gas supplied from the storage tank; A condenser for supercooling after re-liquefying the boil-off gas compressed by the boil-off gas compression unit with a refrigerant; A fuel supply line for supplying a saturated liquefied natural gas passing through the condenser to a high pressure gas injection engine; A pump which is provided to the fuel supply line and compresses the saturated LNG; And a vaporizer for vaporizing the liquefied natural gas compressed in the pump,
The condenser is connected to a refrigerant compression unit for compressing the refrigerant, and an expander for expanding the refrigerant to lower the temperature of the refrigerant,
The condenser includes: a first zone in which the boil-off gas is subcooled after reliquefaction; A second zone through which a refrigerant providing cold heat to the boil-off gas passes; And a third zone through which the refrigerant provided by the refrigerant compression unit passes.
The refrigerant passing through the third zone is cooled by the refrigerant passing through the second zone.
제 1 항에 있어서,
상기 증발가스 압축부에서 압축된 증발가스와 상기 증발가스 압축부를 통과하기 전의 증발가스를 열 교환하여 상기 증발가스 압축부에서 압축된 증발가스를 냉각시키는 열교환기를 더 포함하는 것을 특징으로 하는 선박.
The method of claim 1,
And a heat exchanger configured to cool the boil-off gas compressed by the boil-off gas compression unit by heat-exchanging the boil-off gas compressed by the boil-off gas compression unit and the boil-off gas before passing through the boil-off gas compression unit.
삭제delete 삭제delete 제 1 항에 있어서,
상기 제 2 구역과 상기 제 3 구역을 연결하며, 상기 제 3 구역을 통과하는 냉매의 일부가 유입되는 바이패스 라인이 더 포함되고,
상기 바이패스 라인에는 냉매를 감압시켜 온도를 낮추는 감압 밸브가 제공되는 것을 특징으로 하는 선박.
The method of claim 1,
Further comprising a bypass line connecting the second zone and the third zone, a portion of the refrigerant flowing through the third zone is introduced,
The bypass line is provided with a pressure reducing valve for reducing the temperature by reducing the refrigerant.
제 5 항에 있어서,
상기 제 1 구역을 흐르는 액화천연가스는 상기 감압 밸브에 의해 온도가 낮아진 냉매와 열교환하여 과냉되는 것을 특징으로 하는 선박.
The method of claim 5, wherein
The liquefied natural gas flowing through the first zone is superheated by heat exchange with a refrigerant having a lower temperature by the pressure reducing valve.
제 1 항, 제 5 항 및 제 6 항 중 어느 한 항에 있어서,
상기 기화기의 전단에는 액화천연가스를 가열하는 프리히터가 더 제공되고,
상기 프리히터는 상기 냉매 압축부를 통과한 냉매를 가열원으로 사용하는 것을 특징으로 하는 선박.The method according to any one of claims 1, 5 and 6,
The preheater for heating the liquefied natural gas is further provided at the front end of the vaporizer,
The preheater is a vessel, characterized in that to use the refrigerant passing through the refrigerant compression unit as a heating source.
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