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KR20190098319A - Reliquefaction system of boil-off gas for ship - Google Patents

Reliquefaction system of boil-off gas for ship Download PDF

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Publication number
KR20190098319A
KR20190098319A KR1020180018106A KR20180018106A KR20190098319A KR 20190098319 A KR20190098319 A KR 20190098319A KR 1020180018106 A KR1020180018106 A KR 1020180018106A KR 20180018106 A KR20180018106 A KR 20180018106A KR 20190098319 A KR20190098319 A KR 20190098319A
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South Korea
Prior art keywords
bog
lng
heat exchanger
supply line
reliquefaction
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Application number
KR1020180018106A
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Korean (ko)
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KR102110325B1 (en
Inventor
윤상득
김세정
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주식회사 동화엔텍
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Priority to KR1020180018106A priority Critical patent/KR102110325B1/en
Publication of KR20190098319A publication Critical patent/KR20190098319A/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
    • 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
    • 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
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same 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
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • 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
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2260/00—Heat exchangers or heat exchange elements having special size, e.g. microstructures
    • F28F2260/02—Heat exchangers or heat exchange elements having special size, e.g. microstructures having microchannels

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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

The present invention relates to a system for reliquefying a boil-off gas (BOG) for a ship, and more particularly, to a system for reliquefying a boil-off gas for a ship, which can reliquefy a BOG generated in an LNG tank and prevent clogging due to oil of a microfluidic heat exchanger. The system for reliquefying a boil-off gas for a ship, according to the present invention, comprises: an LNG supply line supplying LNG of the LNG tank to a main engine; a BOG supply line supplying, to the diesel engine, the BOG generated in the LNG tank; and a BOG reliquefaction line branched from the BOG supply line and reliquefying the BOG by heat exchange with the LNG of the LNG supply line such that the BOG returns to the LNG tank. A first microfluidic heat exchanger having microchannels is provided between the LNG supply line and the BOG reliquefaction line to cool the BOG, and an oil pre-compressor is provided on the BOG reliquefaction line to supply the BOG to the first microfluidic heat exchanger, thereby preventing clogging of the microchannels.

Description

선박용 증발가스 재액화 시스템{Reliquefaction system of boil-off gas for ship}Reliquefaction system of boil-off gas for ship}

본 발명은 선박용 증발가스 재액화 시스템에 관한 것으로, LNG탱크에서 발생한 BOG를 재액화하고 미세유로열교환기의 오일에 의한 막힘현상을 방지할 수 있는 선박용 증발가스 재액화 시스템에 관한 기술이다.The present invention relates to a boil-off boil-off liquefaction system, and a technique for boil-off boil-off liquefaction system that can re-liquefy BOG generated in the LNG tank and prevent clogging due to oil in the micro-flow heat exchanger.

LNG(Liquefied Natural Gas) 즉 '액화천연가스'는 연소 시 대기 오염 물질 배출량이 적은 친환경 연료이다. LNG는 메탄을 주성분으로 하는 천연가스를 약 -163℃로 냉각해서 액화시키면 기체 대비 1/600 정도의 부피로 줄일 수 있는 장점이 있다. 이러한 환경적요인으로 인해 최근 선박용 엔진의 연료로서 LNG의 사용이 많이 되고 있다.LNG (Liquefied Natural Gas), or liquefied natural gas, is an environmentally friendly fuel with low emissions of air pollutants during combustion. LNG has the advantage that it can be reduced to about 1/600 of the volume compared to the gas by liquefying the natural gas mainly containing methane to about -163 ℃. Due to these environmental factors, the use of LNG as a fuel for marine engines has recently increased.

그리고, 선박의 엔진, 발전기 등의 연료로 LNG가 많이 사용하게 되는데, 완벽한 단열의 어려움으로 LNG탱크에서는 BOG(Boil Off Gas) 즉, '증발가스'가 많이 발생하게 된다. 이러한 증발가스의 발생은 LNG탱크의 높은 압력이 발생하므로 안전을 위해 재액화 시켜야 한다.In addition, LNG is used a lot as fuel for engines, generators, etc. of ships, and BOG (Boil Off Gas), that is, 'evaporation gas' is generated a lot in LNG tank due to difficulty of perfect insulation. The generation of this boil-off gas is high pressure in the LNG tank and must be re-liquefied for safety.

종래의 기술 중 대한민국 공개실용신안 제20-2018-0000195호에 '선박용 증발가스 재액화 시스템'이 개시되어 있으며 압축과 열교환 등의 과정에 의해 BOG를 재액화하고 있다.In the prior art, Korean Utility Model Publication No. 20-2018-0000195 discloses 'Bottle evaporation gas reliquefaction system' and re-liquefyes BOG by processes such as compression and heat exchange.

그리고, 증발가스의 재액화 냉각의 열교환 효율을 높이기 위해 미세유로를 가진 미세유로열교환기(PCHE 타입 또는 MCHE 타입)를 채택을 많이 하고 있고, 종래에는 통상적으로 증발가스를 압축하기 위해 300bar의 압력을 가진 컴프레셔를 사용하게 된다. 이때 컴프레셔 후단에 오일이 유체에 포함되어 있으며 미세유로열교환기에 유입되는 경우 미세유로를 막아 시스템 효율이 현저하게 떨어지는 문제점이 있어왔다.In addition, in order to increase the heat exchange efficiency of the reliquefaction cooling of the boil-off gas, a micro-fluid heat exchanger (PCHE type or MCHE type) having a micro flow path is often adopted. To use the compressor. In this case, the oil is included in the fluid at the rear of the compressor, and when the microfluidic heat exchanger is introduced, there is a problem in that the system efficiency is significantly reduced by blocking the microfluidic channel.

KRKR 20-2018-000019520-2018-0000195 UU

본 발명은 상기의 문제를 해결하기 위한 것으로, BOG 재액화 시 미세유로열교환기를 사용하여 열교환효율을 높이되, 컴프레셔에서 발생된 오일로 인한 열교환기의 막힘현상을 방지할 수 있는 선박용 증발가스 재액화 시스템을 제공하고자 한다.The present invention is to solve the above problems, while using BOG re-liquefaction to increase the heat exchange efficiency by using a micro-flow heat exchanger, the vessel evaporation gas reliquefaction can prevent the blockage of the heat exchanger due to the oil generated in the compressor We want to provide a system.

상기의 과제를 해결하기 위해 본 발명은 LNG탱크의 LNG를 메인엔진에 공급하는 LNG공급라인; 상기 LNG탱크에서 발생된 BOG를 디젤엔진에 공급하는 BOG공급라인; 상기 BOG공급라인에서 분기되고 상기 BOG를 상기 LNG공급라인의 LNG와 열교환에 의해 상기 BOG를 재액화하여 상기 LNG탱크로 회수되는 BOG재액화라인;으로 구성된 선박용 연료가스 시스템에 있어서, 상기 LNG공급라인과 상기 BOG재액화라인의 사이에는 미세유로가 형성된 제1미세유로열교환기에 설치되어 상기 BOG가 냉각이 이루어지고, 상기 BOG재액화라인에는 오일프리컴프레셔가 설치되어 상기 BOG를 상기 제1미세유로열교환기에 공급하여 미세유로 막힘현상을 방지할 수 있는 것을 특징으로 한다.The present invention to solve the above problems is an LNG supply line for supplying LNG in the LNG tank to the main engine; BOG supply line for supplying the BOG generated in the LNG tank to the diesel engine; In the fuel gas system for ships comprising: a BOG reliquefaction line branched from the BOG supply line and re-liquefied the BOG by heat exchange with the LNG of the LNG supply line to recover the BOG. And a first microfluidic heat exchanger having a fine flow path formed between the BOG reliquefaction line and the BOG is cooled, and an oil pre-compressor is installed in the BOG reliquefaction line to exchange the BOG with the first microfluidic heat exchanger. It is characterized in that it is possible to prevent clogging phenomenon by supplying to the micro-fluid.

상기 BOG재액화라인의 상기 제1미세유로열교환기 출구측과, 상기 LNG공급라인 사이에는 제2미세유로열교환기가 설치되어 상기 제1미세유로열교환기를 통과한 BOG가 재냉각되는 것을 특징으로 한다.The second microfluidic heat exchanger is installed between the outlet of the first microfluidic heat exchanger of the BOG reliquefaction line and the LNG supply line, and the BOG passing through the first microfluidic heat exchanger is recooled.

상기 제1,2미세유로열교환기는 MCHE(Main Cryogenic Heat Exchanger) 또는 PCHE(Printed Circuit Heat Exchanger)인 것을 특징으로 한다.The first and second microfluidic heat exchangers may be a Main Cryogenic Heat Exchanger (MCHE) or a Printed Circuit Heat Exchanger (PCHE).

상기 BOG공급라인은 상기 LNG탱크에서 토출된 BOG가 상기 제1미세유로열교환기를 통과하여 상기 BOG재액화라인의 BOG와 열교환되는 것을 특징으로 한다.The BOG supply line is characterized in that the BOG discharged from the LNG tank is heat-exchanged with the BOG of the BOG reliquefaction line through the first micro-flow heat exchanger.

상기 BOG공급라인에는 상기 제1미세유로열교환기를 통과한 BOG가 가열되게 하는 BOG프리히터가 더 설치되는 것을 특징으로 한다.The BOG supply line is characterized in that the BOG pre-heater is further installed to heat the BOG passed through the first micro-flow heat exchanger.

본 과제의 해결 수단에 제공된 구성에 의하면, BOG 압축 시 100bar 급의 오일프리타입형의 컴프레셔를 사용하여 미세유로열교환기의 오일에 의한 막힘현상을 방지할 수 있다.According to the configuration provided in the solution of the present problem, it is possible to prevent the clogging caused by the oil of the micro euro heat exchanger by using a 100 bar oil-free type compressor during BOG compression.

종래에는 LNG 소모량 대 BOG 처리량이 10:1 수준이었으나, 미세유로열교환기와 오일프리타입형을 채용함으로써 종래의 LNG 소모량 대 BOG 처리량 비율을 5:3비율까지 높일 수 있다.Conventionally, LNG consumption versus BOG throughput was about 10: 1, but by employing a micro-flow heat exchanger and an oil-free type, the ratio of LNG consumption to BOG throughput can be increased to a 5: 3 ratio.

도 1은 본 발명의 바람직한 제1실시예에 따른 선박용 증발가스 재액화 시스템을 도시한 구성도이다.
도 2는 본 발명의 바람직한 제2실시예에 따른 선박용 증발가스 재액화 시스템을 도시한 구성도이다.
도 3은 본 발명의 바람직한 제3실시예에 따른 선박용 증발가스 재액화 시스템을 도시한 구성도이다.1 is a block diagram showing a boil-off gas reliquefaction system according to a first embodiment of the present invention.
Figure 2 is a block diagram showing a boil-off boil-off gas reliquefaction system according to a second embodiment of the present invention.
3 is a block diagram showing a boil-off boil-off gas liquefaction system according to a third embodiment of the present invention.

본 발명의 실시예를 첨부한 도면을 참조하여 설명하면 다음과 같다.An embodiment of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 바람직한 제1실시예에 따른 선박용 증발가스 재액화 시본 발명의 실시예를 첨부한 도면을 참조하여 설명하면 다음과 같다.1 is described with reference to the accompanying drawings an embodiment of the present invention when re-liquefying the boil-off boil-off gas according to the first embodiment of the present invention.

도 1은 본 발명의 바람직한 제1실시예에 따른 선박용 증발가스 재액화 시스템의 실시예이며, 본 발명인 선박용 증발가스 재액화 시스템은 다음과 같이 구성된다.1 is an embodiment of a ship boil-off gas liquefaction system according to a first embodiment of the present invention, the ship boil-off gas reliquefaction system of the present invention is configured as follows.

도 1을 참조하면, 기본적으로 본 발명은 LNG공급라인(10), BOG공급라인(20), BOG재액화라인(30)으로 구성되며, 본 발명에서는 제1미세유로열교환기(100), 오일프리컴프레셔(Oil free compressor,200)가 설치되는 것을 특징으로 한다.Referring to FIG. 1, the present invention basically includes an LNG supply line 10, a BOG supply line 20, and a BOG reliquefaction line 30, and in the present invention, a first microfluidic heat exchanger 100 and oil. It is characterized in that the pre-compressor (Oil free compressor, 200) is installed.

이하에서는 본 발명의 구성을 순서대로 설명하기로 한다.Hereinafter, the configuration of the present invention will be described in order.

상기 LNG공급라인(10)은 LNG(Liquid Natural Gas)가 저장된 LNG탱크(11)에서 LNG액체 연료를 연료 소비처인 메인엔진(MEGI)에 공급하는 라인이다.The LNG supply line 10 is a line for supplying LNG liquid fuel to a main engine (MEGI) as a fuel consumer in an LNG tank 11 in which LNG (Liquid Natural Gas) is stored.

도면상에는 LNG탱크(11)의 LNG가 A,B,C,D 순으로 이동하여 메인엔진에 공급하게 된다.In the drawing, LNG in the LNG tank 11 is moved in the order of A, B, C, and D to be supplied to the main engine.

LNG가 공급되는 A 지점에서 -158℃로 시간당연료소모량 약 5,000kg/h을 처리할 수 있다.At point A where LNG is supplied, it can process about 5,000kg / h of fuel consumption per hour at -158 ℃.

그리고, A와 B 사이에는 고압 부스터 펌프(High Pressure Booster Pump,12)가 설치되어 고압에 의해 LNG를 압축하게 되어 B지점에서 -147℃로 약 300bar까지 올라가게 된다. 그리고, B와 C 사이에는 제1미세유로열교환기(100)가 설치되게 되어 C 지점에서는 LNG가 BOG(Boil Off Gas)와 열교환에 의해 -14℃까지 올라가게 되고, C와 D 사이에는 히터(14)가 설치되게 되어 D 지점에서는 약 40℃까지 온도를 높여 메인엔진에 적절한 온도를 제공하게 된다.In addition, between A and B, a high pressure booster pump 12 is installed to compress LNG by the high pressure, and rises to about 300 bar at the point B of -147 ° C. In addition, the first microfluidic heat exchanger 100 is installed between B and C. At point C, LNG rises to -14 ° C by heat exchange with BOG (Boil Off Gas), and a heater (between C and D). 14) will be installed to increase the temperature to about 40 ℃ at point D to provide the appropriate temperature to the main engine.

상기 BOG공급라인(20)은 LNG가 저장된 LNG탱크에서 발생된 BOG를 디젤엔진에 공급하는 라인이다.The BOG supply line 20 is a line for supplying the BOG generated in the LNG tank in which LNG is stored to the diesel engine.

도면상에는 BOG가 1,2 지점순으로 하여 디젤엔진 즉 발전기에 공급하게 된다.In the figure, BOG is supplied to a diesel engine, that is, a generator in the order of 1,2 points.

BOG가 공급되는 1지점에서 -158℃로 시간당연료소모량 약 3,000kg/h 이다.At one point where BOG is supplied, the fuel consumption is about 3,000kg / h at -158 ℃.

그리고, 1과 2지점 사이에는 BOG컴프레셔(22)와 쿨러(24)가 설치되어 BOG 온도가 40℃로 상승하게 되고 압력은 약 7bar까지 올라가게 되어 디젤엔진에 적절한 온도와 압력에 맞는 BOG 연료를 제공할 수 있게 된다.In addition, between 1 and 2 points, BOG compressor 22 and cooler 24 are installed, and the BOG temperature rises to 40 ° C and the pressure rises to about 7 bar, so that BOG fuel suitable for the temperature and pressure suitable for the diesel engine is supplied. It can be provided.

상기 BOG재액화라인(30)은 BOG공급라인(20)에서 분기되어 재액화하여 상기 LNG탱크(11)로 회수하는 라인이다.The BOG reliquefaction line 30 is a line branched from the BOG supply line 20 to reliquefy and recovered to the LNG tank 11.

여기서, 상기 BOG재액화라인(30)은 BOG의 사용량보다 많이 발생하게 되는 잉여의 BOG를 다시 재액화하기 위해서이다.Here, the BOG reliquefaction line 30 is for re-liquefying the excess BOG that occurs more than the amount of the BOG used.

BOG재액화라인(30)은 BOG를 상기 LNG공급라인(10)의 LNG와 열교환에 의해 상기 BOG를 재액화하게 된다.The BOG reliquefaction line 30 reliquefies the BOG by exchanging the BOG with the LNG of the LNG supply line 10.

도면상으로 보면 BOG공급라인(20)에서 분기되어 3,4,5,6의 지점을 거쳐 LNG탱크로 회수되게 된다.As shown in the figure branched from the BOG supply line 20 is recovered to the LNG tank through the points of 3, 4, 5, 6.

BOG재액화라인(30)의 BOG연료가 3에서 4지점으로 이동시 오일프리컴프레셔(200)와 쿨러(32)가 설치되고, 4에서 5지점 이동시 제1미세유로열교환기(100)가 설치되게 되어 BOG재액화라인(30)의 BOG는 상기 LNG공급라인(10)의 LNG와 열교환하게 된다.When the BOG fuel of the BOG reliquefaction line 30 is moved from 3 to 4 points, the oil free compressor 200 and the cooler 32 are installed, and when the 4 to 5 points are moved, the first microfluidic heat exchanger 100 is installed. BOG of the BOG reliquefaction line 30 is to heat exchange with the LNG of the LNG supply line (10).

여기서, 상기 제1미세유로열교환기(100)는 MCHE(Main Cryogenic Heat Exchanger)를 사용하였다.Here, the first microfluidic heat exchanger 100 used a main cryogenic heat exchanger (MCHE).

먼저, 상기 제1미세유로열교환기(100)는 상기 LNG공급라인(10)과 상기 BOG재액화라인(30)의 사이에 설치되고 미세유로가 형성되어 상기 LNG와 열교환에 p의해 상기 BOG가 냉각되게 된다.First, the first microfluidic heat exchanger (100) is installed between the LNG supply line (10) and the BOG reliquefaction line (30), and a fine flow path is formed so that the BOG is cooled by p with heat exchange with the LNG. Will be.

도면상으로 보면 4에서 5지점 사이에 제1미세유로열교환기(100)가 설치되어 5지점에서는 BOG가 약 -138℃까지 떨어지게 되고, 5지점 이전에 밸브가 설치되어 압력은 약 6.5bar 까지 떨어지게 된다. As shown in the drawing, the first microfluidic heat exchanger 100 is installed between 4 and 5 points so that BOG drops to about -138 ° C at 5 points, and a valve is installed before 5 points so that the pressure drops to about 6.5 bar. do.

그리고, 3에서 4지점 사이에 BOG는 상기 오일프리컴프레셔(200)에 의해 4지점에서 100bar의 압력으로 높아지게 되어 상기 제1미세유로열교환기(100)에 공급되게 된다.In addition, between 3 and 4 points, BOG is increased by a pressure of 100 bar at 4 points by the oil pre-compressor 200 to be supplied to the first microfluidic heat exchanger 100.

여기서, 상기 오일프리컴프레셔(200)는 약 100bar의 압력을 가진 것으로 채용하는데, 왜냐하면 오일을 사용하지 않는 컴프레셔는 최고 100bar의 압력을 제공할 수 있기 때문이다. 종래에는 300bar의 압력을 가진 오일컴프레셔를 사용하였는데 이는 상기 제1미세유로열교환기(100)의 미세유로에 윤활유로 사용되는 오일이 일부 삽입되어 막힘현상이 발생하였기 때문이다.Here, the oil pre-compressor 200 is employed as having a pressure of about 100 bar, because the compressor without using oil can provide a pressure of up to 100 bar. In the related art, an oil compressor having a pressure of 300 bar is used, because a part of the oil used as lubricating oil is inserted into the microchannel of the first microfluidic heat exchanger 100 to cause clogging.

따라서, 본 발명의 제1실시예에서는 오일프리컴프레셔(200)를 사용함으로써 제1미세유로열교환기(100)에 오일막힘 현상을 방지할 수 있으므로 BOG 재액화 처리 효율을 높일 수 있다.Therefore, in the first embodiment of the present invention, oil clogging may be prevented in the first microfluidic heat exchanger 100 by using the oil pre-compressor 200, thereby improving BOG reliquefaction treatment efficiency.

그리고, 5지점의 후단에 기액분리기(34)가 형성되어 LNG와 BOG를 분리하여 LNG는 상기 LNG탱크(11)로 공급하게 되고, BOG는 BOG공급라인(20)의 1지점으로 공급하게 된다.Then, a gas-liquid separator 34 is formed at the rear end of the five points to separate the LNG from the BOG, and the LNG is supplied to the LNG tank 11, and the BOG is supplied to one point of the BOG supply line 20.

도 2은 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 시스템의 구성도이다.2 is a block diagram of a boil-off gas reliquefaction system according to a preferred embodiment of the present invention.

도 2를 참조하면, 앞서 실시한 도 1의 제1실시예의 구성과 같이하며, 추가적으로 제2미세유로열교환기(300)가 설치되게 된다.Referring to FIG. 2, the configuration of the first embodiment of FIG. 1 is performed as described above, and the second microfluidic heat exchanger 300 is additionally installed.

즉, LNG공급라인(10), BOG공급라인(20), BOG재액화라인(30)으로 구성되며, 본 발명에서는 제1미세유로열교환기(100), 오일프리컴프레셔(Oil free compressor,200)의 구성이 제1실시예와 유사하며 상세설명은 간략하게 설명하며, 제2미세유로열교환기(300)가 추가되어 BOG재액화라인(30)의 BOG가 재냉각 되게 하는 것을 특징으로 하므로 이에 대해서 상세 설명하기로 한다.That is, the LNG supply line 10, BOG supply line 20, BOG liquefaction line 30 is composed of, in the present invention, the first fine oil heat exchanger (100), oil free compressor (Oil free compressor, 200) The configuration is similar to that of the first embodiment, and the detailed description will be briefly described, and the second microfluidic heat exchanger 300 is added so that the BOG of the BOG reliquefaction line 30 is recooled. It will be described in detail.

상기 LNG공급라인(10)은 A,B,C,D 경로를 거쳐 메인엔진에 LNG연료를 공급하게 되고, 이때 제2실시예에서는 BOG를 재냉각하기 위해 상기 LNG 공급라인(10)은 A지점에서 A-1지점으로 분지되어 상기 제2미세유로열교환기(300)를 거쳐 A-2에서 A로 다시 합류되게 된다.The LNG supply line 10 supplies LNG fuel to the main engine via A, B, C, and D paths. In this embodiment, the LNG supply line 10 is point A to recool the BOG. Branched to point A-1 to be joined again from A-2 to A via the second microfluidic heat exchanger (300).

그리고, BOG재액화라인(30)은 3,4,5-1,5-2,6의 경로를 거쳐 이동하게 된다. 상기 BOG재액화라인(30)은 제1미세유로열교환기(100)에 의해 1차로 냉각하게 되고, 2차로 제2미세유로열교환기(300)에 의해 재냉각되게 된다.Then, the BOG reliquefaction line 30 is moved through the path of 3, 4, 5-1, 5-2, 6. The BOG reliquefaction line 30 is first cooled by the first microfluidic heat exchanger 100 and secondly recooled by the second microfluidic heat exchanger 300.

제2미세유로열교환기(300)는 상기 BOG재액화라인(30)의 상기 제1미세유로열교환기(100) 출구측과, 상기 LNG공급라인(10) 사이에 설치된다. 그래서 상기 제2미세유로열교환기(300)는 상기 제1미세유로열교환기(100)를 통과한 BOG가 재냉각시키는 것을 특징으로 한다.The second microfluidic heat exchanger 300 is installed between the outlet side of the first microfluidic heat exchanger 100 of the BOG reliquefaction line 30 and the LNG supply line 10. Thus, the second microfluidic heat exchanger 300 is characterized in that the BOG passing through the first microfluidic heat exchanger 100 is recooled.

여기서, 상기 제1미세유로열교환기(100)는 MCHE(Main Cryogenic Heat Exchanger)를 사용하였고, 상기 제2미세유로열교환기는 PCHE(Printed Circuit Heat Exchanger)를 사용하였다.Here, the first microfluidic heat exchanger (100) used a Main Cryogenic Heat Exchanger (MCHE), and the second microfluidic heat exchanger (PCHE) used a printed circuit heat exchanger.

제2실시예와 같이 BOG를 제1미세유로열교환기(100), 제2미세유로열교환기(300)를 통해 2번 냉각되게 하므로 BOG를 동일한 빠른시간에 더 냉각시킬 수 있고 그에 따라, BOG 재액화 효율을 향상시킬 수 있다.As in the second embodiment, the BOG is cooled twice through the first microfluidic heat exchanger 100 and the second microfluidic heat exchanger 300, so that the BOG can be further cooled at the same fast time and, accordingly, The liquefaction efficiency can be improved.

그리고, 제1미세유로열교환기(100)와, 제2미세유로열교환기(300)가 다단으로 연결됨으로써 미세유로열교환기들의 사이즈를 축소 시킬 수 있으며, 온도와 비용 등을 고려하여 통상의 기술자가 다양하게 실시할 수 있다.In addition, the first microfluidic heat exchanger 100 and the second microfluidic heat exchanger 300 may be connected in multiple stages to reduce the size of the microfluidic heat exchangers, and a person skilled in the art may consider temperature and cost. It can be variously performed.

앞서 설명한 예에 따라 A지점에서는 LNG 연료를 5000kg/h 처리를 하고, 1지점에서는 BOG 연료를 3000kg/h 까지 재액화 및 냉각회수 가능하므로 그 처리량 비율을 종래의 10:1에서 5:3까지 비율로 처리 가능하므로 보다 많은 BOG 재액화 처리를 할 수 있다.According to the example described above, the LNG fuel can be treated at 5000 kg / h at point A, and the BOG fuel can be reliquefied and cooled at 3000 kg / h at point 1, so the throughput ratio is 10: 1 to 5: 3. More BOG reliquefaction can be achieved.

도 3은 본 발명의 바람직한 제3실시예에 따른 선박용 증발가스 재액화 시스템의 구성도이다.3 is a configuration diagram of a boil-off gas reliquefaction system according to a third embodiment of the present invention.

도 3을 참조하면, 본 발명에서는 앞서 실시한 도 1의 제1실시예의 구성과 같이하며, 추가적으로 제1미세유로열교환기(100)가 3개의 유로를 가지게 되며, LNG탱크(11)에서 공급되는 BOG 냉열을 이용하여 BOG재액화라인(30)의 BOG를 냉각할 수 있게 된다.Referring to FIG. 3, in the present invention, the configuration of the first embodiment of FIG. 1 is the same as that of the first embodiment. In addition, the first microfluidic heat exchanger 100 has three flow paths, and the BOG supplied from the LNG tank 11. It is possible to cool the BOG of the BOG reliquefaction line 30 using cold heat.

상기 BOG공급라인(20)은 상기 LNG탱크(11)에서 토출된 BOG가 상기 제1미세유로열교환기(100)를 통과하여 상기 BOG재액화라인(20)의 BOG와 열교환되게 된다.In the BOG supply line 20, the BOG discharged from the LNG tank 11 passes through the first microfluidic heat exchanger 100 to exchange heat with the BOG of the BOG reliquefaction line 20.

따라서, 상기 제1미세유로열교환기(100)는 상기 재액화라인(20)의 BOG를 LNG공급라인(10)의 LNG와의 열교환뿐만 아니라 BOG공급라인(20) BOG와 동시에 열교환할 수 있어 재액화 효율을 높일 수 있다.Therefore, the first microfluidic heat exchanger 100 can not only heat exchange the BOG of the reliquefaction line 20 with the LNG of the LNG supply line 10 but also heat exchange the BOG of the BOG supply line 20 with the BOG to reliquefy. The efficiency can be improved.

그리고, 상기 BOG공급라인(20)에는 상기 제1미세유로열교환기(100)의 출구측에 BOG프리히터(26)가 추가되어 BOG컴프레셔(22)의 부하를 줄일 수 있다.In addition, a BOG preheater 26 may be added to the BOG supply line 20 at the outlet side of the first microfluidic heat exchanger 100 to reduce the load of the BOG compressor 22.

제3실시예에서 제1미세유로열교환기(100)를 3개의 유로를 통해 재액화하므로 종래에는 LNG 소모량 대 BOG 처리량이 10:1 수준이었으나, 종래의 LNG 소모량 대 BOG 처리량 비율을 1:1비율까지 높일 수 있다.In the third embodiment, since the first microfluidic heat exchanger 100 is liquefied through three flow paths, the LNG consumption to BOG throughput was about 10: 1, but the ratio of conventional LNG consumption to BOG throughput was 1: 1. You can increase it.

이상에서 설명한 본 발명에 따른 선박용 증발가스 재액화 시스템은 상기한 실시예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양하게 변경하여 실시할 수 있는 범위까지 특허청구범위의 보호범위에 속하는 것으로 보아야 할 것이다.The vessel boil-off liquefaction system according to the present invention described above is not limited to the above-described embodiment, and the general knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the following claims. Anyone with such a claim should be considered to be within the scope of protection of the claims to the extent that any person can make various changes.

10: LNG공급라인
20: BOG공급라인
30: BOG재액화라인
100: 제1미세유로열교환기
200: 오일프리컴프레셔
300: 제2미세유로열교환기10: LNG supply line
20: BOG Supply Line
30: BOG Reliquefaction Line
100: first fine euro heat exchanger
200: oil free compressor
300: second fine euro heat exchanger

Claims (5)

LNG탱크의 LNG를 메인엔진에 공급하는 LNG공급라인; 상기 LNG탱크에서 발생된 BOG를 디젤엔진에 공급하는 BOG공급라인; 상기 BOG공급라인에서 분기되고 상기 BOG를 상기 LNG공급라인의 LNG와 열교환에 의해 상기 BOG를 재액화하여 상기 LNG탱크로 회수되는 BOG재액화라인;으로 구성된 선박용 증발가스 재액화 시스템에 있어서,
상기 LNG공급라인과 상기 BOG재액화라인의 사이에는 미세유로가 형성된 제1미세유로열교환기에 설치되어 상기 BOG가 냉각이 이루어지고,
상기 BOG재액화라인에는 오일프리컴프레셔가 설치되어 상기 BOG를 상기 제1미세유로열교환기에 공급하여 미세유로 막힘현상을 방지할 수 있는 것을 특징으로 하는 선박용 증발가스 재액화 시스템.LNG supply line for supplying LNG from the LNG tank to the main engine; BOG supply line for supplying the BOG generated in the LNG tank to the diesel engine; In the BOG reliquefaction system consisting of; BOG reliquefaction line branched from the BOG supply line and re-liquefied the BOG by heat exchange with the LNG of the LNG supply line to recover the LNG tank,
Between the LNG supply line and the BOG reliquefaction line is installed in the first microfluidic heat exchanger formed with a fine flow path, the BOG is cooled,
The BOG reliquefaction line is an oil pre-compressor is installed to supply the BOG to the first microfluidic heat exchanger to prevent the clogging phenomenon of the micro-channel evaporation gas for ships, characterized in that. 제1항에 있어서,
상기 BOG재액화라인의 상기 제1미세유로열교환기 출구측과, 상기 LNG공급라인 사이에는 제2미세유로열교환기가 설치되어 상기 제1미세유로열교환기를 통과한 BOG가 재냉각되는 것을 특징으로 하는 선박용 증발가스 재액화 시스템.The method of claim 1,
A vessel for a vessel characterized in that the BOG passing through the first microfluidic heat exchanger is re-cooled between the outlet of the first microfluidic heat exchanger and the LNG supply line of the BOG reliquefaction line. Evaporative Gas Reliquefaction System. 제2항에 있어서,
상기 제1,2미세유로열교환기는,
MCHE(Main Cryogenic Heat Exchanger) 또는 PCHE(Printed Circuit Heat Exchanger)인것을 특징으로 하는 선박용 증발가스 재액화 시스템.The method of claim 2,
The first and second fine thermal exchanger,
Evaporative gas reliquefaction system for ships, characterized in that the MCHE (Main Cryogenic Heat Exchanger) or PCHE (Printed Circuit Heat Exchanger). 제1항에 있어서,
상기 BOG공급라인은,
상기 LNG탱크에서 토출된 BOG가 상기 제1미세유로열교환기를 통과하여 상기 BOG재액화라인의 BOG와 열교환되는 것을 특징으로 하는 선박용 증발가스 재액화 시스템.The method of claim 1,
The BOG supply line,
And a BOG discharged from the LNG tank passes through the first microfluidic heat exchanger to exchange heat with the BOG of the BOG reliquefaction line. 제4항에 있어서,
상기 BOG공급라인에는,
상기 제1미세유로열교환기를 통과한 BOG가 가열되게 하는 BOG프리히터가 더 설치되는 것을 특징으로 하는 선박용 증발가스 재액화 시스템.The method of claim 4, wherein
The BOG supply line,
Evaporating gas re-liquefaction system for ships, characterized in that the BOG pre-heater is further installed to heat the BOG passing through the first micro-flow heat exchanger.
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