KR101690939B1 - Reliquefaction system, and ship including the same - Google Patents

Reliquefaction system, and ship including the same Download PDF

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KR101690939B1
KR101690939B1 KR1020140168080A KR20140168080A KR101690939B1 KR 101690939 B1 KR101690939 B1 KR 101690939B1 KR 1020140168080 A KR1020140168080 A KR 1020140168080A KR 20140168080 A KR20140168080 A KR 20140168080A KR 101690939 B1 KR101690939 B1 KR 101690939B1
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storage tank
liquefied
liquefied gas
gas
tank
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KR1020140168080A
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Korean (ko)
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KR20160065246A (en
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성용욱
이승재
정승재
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삼성중공업 주식회사
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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
    • 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
    • B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • 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
    • F17C2265/032—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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

Abstract

재액화 시스템 및 이를 포함하는 선박을 개시한다. 본 발명의 실시 예에 따른 재액화 시스템은 제1액화가스를 저장하는 제1저장탱크; 제1액화가스보다 액화점이 높은 제2액화가스를 저장하는 제2저장탱크; 제1저장탱크 내측에 마련되며, 제1저장탱크 내의 제1액화가스 또는 제1액화가스 증발가스와 제2저장탱크로부터 공급받은 제2액화가스 증발가스 간 열교환이 수행되도록 하는 열교환부; 및 제1저장탱크 내측에 마련되며, 제2저장탱크로부터 공급받은 제2액화가스 증발가스가 열교환부를 거쳐 재액화되어 저장되는 내부탱크;를 포함한다.A re-liquefaction system and a vessel including the same. The re-liquefaction system according to an embodiment of the present invention includes a first storage tank for storing a first liquefied gas; A second storage tank for storing a second liquefied gas having a higher liquefaction point than the first liquefied gas; A heat exchange unit provided inside the first storage tank for performing heat exchange between the first liquefied gas or the first liquefied gas evaporated gas in the first storage tank and the second liquefied gas evaporated gas supplied from the second storage tank; And an inner tank which is provided inside the first storage tank and in which the second liquefied gas evaporated gas supplied from the second storage tank is re-liquefied and stored via the heat exchanger.

Description

재액화 시스템 및 이를 포함하는 선박{RELIQUEFACTION SYSTEM, AND SHIP INCLUDING THE SAME}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a re-liquefaction system,

본 발명은 재액화 시스템 및 이를 포함하는 선박에 관한 것이다.The present invention relates to a re-liquefaction system and a ship including the same.

셰일가스(Shale Gas) 및 액화천연가스(Liquefied Natural Gas, 이하 ‘LNG’라 함) 등으로부터 추출된 에탄(Ethane)은 석유화학제품의 원료로 사용되며, 최근에는 그 경제성이 부각되고 있다. 1기압에서 에탄은 대략 ―88.6℃, LNG의 주요 구성 성분인 메탄은 대략 ―161.5℃의 끊는점을 갖는다. Ethane extracted from shale gas and Liquefied natural gas (LNG) is used as a raw material for petrochemical products, and recently its economical efficiency has been highlighted. At 1 atmosphere, ethane is approximately -88.6 ° C, and methane, the main constituent of LNG, has a breaking point of approximately -161.5 ° C.

에탄과 천연가스는 액화에탄 및 LNG 형태로 액화되어 선박에 저장될 수 있다. 선박은 액화연료 운반선, 액화연료 RV(Regasification Vessel), 컨테이너선, 일반상선, LNG FPSO(Floating, Production, Storage and Off-loading), LNG FSRU(Floating Storage and Regasification Unit) 등을 포함할 수 있다.Ethane and natural gas can be liquefied in liquefied ethane and LNG form and stored onboard. The vessel may include a liquefied fuel carrier, a regasification vessel (RV), a container ship, a commercial vessel, an LNG FPSO (Floating, Production, Storage and Off-loading), and an LNG FSRU (Floating Storage and Regulation Unit).

이러한 선박은 LNG 증발가스(BOG, Boil-Off Gas) 또는 LNG의 압력, 온도, 상태 등을 변환하여 엔진의 연료로 공급하는 시스템을 구비할 수 있다. 선박의 엔진은 이종연료를 연료로서 사용하는 DFDE(Dual Fuel Disel Electric) 엔진과 같은 저압가스 분사엔진과 ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압가스 분사엔진 등을 포함할 수 있다. Such a vessel may be equipped with a system for converting the pressure, temperature, state, etc. of LNG vapor (BOG, Boil-Off Gas) or LNG to fuel for the engine. The vessel's engine may include a low pressure gas injection engine such as a Dual Fuel Disel Electric (DFDE) engine using a different fuel as fuel and a high pressure gas injection engine such as an ME-GI engine (Man B & W's Gas Injection engine) .

또, 선박은 LNG 증발가스를 효과적으로 재액화하여 저장하는 장치들을 구비할 수 있다. 예컨대, 한국공개특허 제10-2012-0103421호(2012.09.19. 공개)는 LNG 증발가스를 재액화하여 저장하는 구성을 제시한 바 있다. 이외에도 종래에는 LNG 증발가스를 재액화하여 LNG 저장 및 수송을 용이하게 수행할 수 있는 기술 개발이 활발하게 이루어지고 있다.In addition, the vessel may have devices for effectively liquefying and storing the LNG vaporized gas. For example, Korean Patent Laid-Open No. 10-2012-0103421 (published on Sep. 19, 2012) has proposed a configuration for re-liquefying and storing LNG vaporized gas. In addition, conventionally, technology for easily storing and transporting LNG by re-liquefying LNG evaporation gas has been actively developed.

그러나, 액화에탄을 수송하는 선박에서 액화에탄 증발가스를 효과적으로 재액화하여 저장하는 기술에 대한 개발은 미흡한 실정이다.However, there is insufficient development of a technique for effectively liquefying and storing liquefied ethane-evaporated gas in a ship carrying liquefied ethane.

한국공개특허 제10-2012-0103421호(2012.09.19. 공개)Korean Patent Laid-Open No. 10-2012-0103421 (published on September 19, 2012)

본 발명의 실시 예는 제1액화가스와 제1액화가스보다 높은 액화점을 가진 제2액화가스를 수송하는 선박에서 제2액화가스 증발가스를 효과적으로 재액화하여 저장하는 재액화 시스템 및 이를 포함하는 선박을 제공하고자 한다.An embodiment of the present invention is a re-liquefaction system for effectively re-liquefying and storing a second liquefied gas evaporated gas in a vessel for transporting a second liquefied gas having a higher liquefaction point than the first liquefied gas and the first liquefied gas, We want to provide ships.

본 발명의 일 측면에 따르면, 제1액화가스를 저장하는 제1저장탱크; 상기 제1액화가스보다 액화점이 높은 제2액화가스를 저장하는 제2저장탱크; 상기 제1저장탱크 내측에 마련되며, 상기 제1저장탱크 내의 제1액화가스 또는 제1액화가스 증발가스와 상기 제2저장탱크로부터 공급받은 제2액화가스 증발가스 간 열교환이 수행되도록 하는 열교환부; 및 상기 제1저장탱크 내측에 마련되며, 상기 제2저장탱크로부터 공급받은 제2액화가스 증발가스가 상기 열교환부를 거쳐 재액화되어 저장되는 내부탱크;를 포함하는 재액화 시스템이 제공될 수 있다.According to an aspect of the present invention, there is provided a liquid storage tank comprising: a first storage tank for storing a first liquefied gas; A second storage tank for storing a second liquefied gas having a higher liquefaction point than the first liquefied gas; A heat exchange unit provided inside the first storage tank for performing heat exchange between the first liquefied gas or the first liquefied gas evaporated gas in the first storage tank and the second liquefied gas evaporated gas supplied from the second storage tank, ; And an internal tank provided inside the first storage tank, wherein the second liquefied gas evaporated gas supplied from the second storage tank is re-liquefied and stored through the heat exchanger.

상기 제2저장탱크로부터 공급된 제2액화가스 증발가스가 상기 열교환부를 거쳐 상기 내부탱크에 저장되도록 하는 공급라인과, 상기 내부탱크에 저장된 제2액화가스가 상기 제2저장탱크에 재저장되도록 하는 회수라인과, 상기 내부탱크 내에 설치되고, 상기 회수라인을 통해 상기 내부탱크에 저장된 제2액화가스를 상기 제2저장탱크로 보내는 이송펌프를 더 포함할 수 있다.A supply line for allowing the second liquefied gas evaporated gas supplied from the second storage tank to be stored in the internal tank via the heat exchanger, and a second line for storing the second liquefied gas stored in the internal tank in the second storage tank And a transfer pump installed in the internal tank for sending a second liquefied gas stored in the internal tank to the second storage tank through the recovery line.

상기 공급라인에 설치되고, 상기 제2저장탱크로부터 공급받은 제2액화가스 증발가스를 압축하여 상기 열교환부로 보내는 압축기를 더 포함할 수 있다.And a compressor installed in the supply line for compressing the second liquefied gas evaporated gas supplied from the second storage tank and sending it to the heat exchanger.

상기 제1액화가스는 액화천연가스, 상기 제2액화가스는 액화에탄일 수 있다.The first liquefied gas may be liquefied natural gas, and the second liquefied gas may be liquefied ethane.

본 발명의 다른 측면에 따르면, 상술한 재액화 시스템을 포함하는 선박이 제공될 수 있다.According to another aspect of the present invention, a vessel including the above-described re-liquefaction system can be provided.

본 발명의 실시 예에 따른 재액화 시스템 및 이를 포함하는 선박은 제1액화가스와 제1액화가스보다 높은 액화점을 가진 제2액화가스를 수송하는 선박에서 제2액화가스 증발가스를 효과적으로 재액화하여 저장할 수 있다. The re-liquefaction system according to the embodiment of the present invention and the ship including the same can effectively re-liquefy the second liquefied gas evaporated gas in the ship which transports the second liquefied gas having a higher liquefaction point than the first liquefied gas and the first liquefied gas .

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 can be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 실시 예에 따른 재액화 시스템을 나타낸다.1 shows a re-liquefaction system 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 described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but 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 the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

도 1을 참조하면, 본 발명의 실시 예에 따른 재액화 시스템(100)은 액화에탄을 운반하는 과정에서 발생하는 액화에탄 증발가스를 효과적으로 재액화시킬 수 있다. 재액화 시스템(100)은 액화에탄을 수송하는 선박에 설치될 수 있다. 또, 재액화 시스템(100)은 각종 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 선박에 적용될 수 있다.Referring to FIG. 1, the re-liquefaction system 100 according to the embodiment of the present invention can effectively re-liquefy the liquefied ethane gas generated in the process of transporting liquefied ethane. The re-liquefaction system 100 may be installed in a vessel that transports liquefied ethane. In addition, the re-liquefaction system 100 includes various liquefied fuel carriers, regasification vessels, container ships, general merchant ships, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU ) And the like.

이러한 재액화 시스템(100)은 LNG(C1)를 저장하는 제1저장탱크(110), LNG(C1)보다 액화점이 높은 액화에탄(C2)을 저장하는 제2저장탱크(120), 제1저장탱크(110) 내측에 마련되며, 제1저장탱크(110)에 저장된 LNG(C1)와 제2저장탱크(120)로부터 공급받은 액화에탄(C2) 증발가스 간 열교환이 수행되도록 하는 열교환부(115) 및 제1저장탱크(110) 내측에 마련되며, 제2저장탱크(120)로부터 공급된 액화에탄(C2) 증발가스가 열교환부(115)를 거쳐 재액화되어 저장되는 내부탱크(130)를 포함한다.The re-liquefaction system 100 includes a first storage tank 110 for storing the LNG C1, a second storage tank 120 for storing liquefied C2 having a higher liquefaction point than the LNG C1, A heat exchange unit 115 provided inside the tank 110 for performing heat exchange between the LNG C1 stored in the first storage tank 110 and the evaporated gas of liquefied C2 supplied from the second storage tank 120, And an internal tank 130 which is provided inside the first storage tank 110 and in which liquefied ethane C2 vaporized gas supplied from the second storage tank 120 is re-liquefied and stored through the heat exchanging unit 115 .

또, 재액화 시스템(100)은 제2저장탱크(120)로부터 공급된 액화에탄(C2) 증발가스가 열교환부(115)를 거쳐 내부탱크(130)에 저장되도록 하는 공급라인(L1)과, 내부탱크(130)에 저장된 액화에탄(C2)가 제2저장탱크(120)에 재저장되도록 하는 회수라인(L2)을 구비할 수 있다.The re-liquefaction system 100 includes a supply line L1 for allowing evaporated liquefied C2 gas supplied from the second storage tank 120 to be stored in the internal tank 130 via the heat exchange unit 115, And a recovery line L2 for allowing the liquefied ethane C2 stored in the internal tank 130 to be re-stored in the second storage tank 120. [

여기서, 제1저장탱크(110)는 LNG(C1)를 저장하며, 내측에 열교환부(115) 및 내부탱크(130)를 마련한다. 열교환부(115)와 내부탱크(130)는 제1저장탱크(110)의 LNG(C1)에 잠기도록 배치될 수 있다. Here, the first storage tank 110 stores the LNG C1, and the heat exchanger 115 and the inner tank 130 are provided inside. The heat exchanging part 115 and the inner tank 130 may be arranged to be submerged in the LNG (C1) of the first storage tank (110).

이는 열교환부(115)를 통해 제1저장탱크(110)에 저장된 LNG(C1)와 제2저장탱크(120)로부터 공급받은 액화에탄(C2) 증발가스 간 열교환이 효과적으로 이루어지도록 하기 위함이다. This is to effectively perform the heat exchange between the LNG (C1) stored in the first storage tank (110) and the liquefied ethanol (C2) evaporated gas supplied from the second storage tank (120) through the heat exchanger (115).

또, 제2저장탱크(120)로부터 공급된 액화에탄(C2) 증발가스가 열교환부(115)를 거쳐 재액화되어 내부탱크(130)에 저장된 상태에서, 내부탱크(130)에 저장된 액화에탄(C2)의 증발가스와 제1저장탱크(110)의 LNG(C1) 간 지속적으로 열교환이 이루어져 내부탱크(130)에 저장된 액화에탄(C2) 증발가스가 재액화될 수 있도록 하기 위함이다.The liquefied ethane (C2) evaporated gas supplied from the second storage tank 120 is re-liquefied through the heat exchanging unit 115 and stored in the internal tank 130. The liquefied ethane stored in the internal tank 130 C2) and the LNG (C1) of the first storage tank (110) so that the liquefied methane (C2) evaporated gas stored in the internal tank (130) can be re-liquefied.

이러한 내부탱크(130) 내측에는 회수라인(L2)을 통해 내부탱크(130)에 저장된 액화에탄를 제2저장탱크(120)로 보내는 이송펌프(117)가 구비될 수 있다.A transfer pump 117 may be provided inside the inner tank 130 to send the liquefied methane stored in the inner tank 130 to the second storage tank 120 through the recovery line L2.

다른 예에서, 상술한 열교환부(115)는 제1저장탱크(110) 내측에 배치되되, LNG(C1)에 완전히 잠긴 상태가 아닌 일부만 잠기거나, 잠기지 않은 상태로 배치될 수 있다. 도시하지는 않았으나, 열교환부(115)가 제1저장탱크(110)에 저장된 LNG(C1)에 잠기지 않은 상태로 배치된 경우, 열교환부(115)를 통해 제2저장탱크(120)로부터 공급된 액화에탄(C2) 증발가스와 제1저장탱크(110) 내 LNG(C1) 증발가스 간 열교환이 이루어질 수 있다.In another example, the above-described heat exchanging unit 115 may be disposed inside the first storage tank 110, and may be disposed in a state in which the LNG is not completely submerged in the LNG (C1), or in a partially submerged state. Although not shown, when the heat exchanging unit 115 is disposed in a state that the LNG is not immersed in the LNG stored in the first storage tank 110, the LNG supplied from the second storage tank 120 through the heat exchanging unit 115 Ethane (C2) evaporation gas and the LNG (C1) evaporation gas in the first storage tank 110 can be exchanged.

제2저장탱크(120)는 복수 개로 마련되어 액화에탄(C2)을 저장할 수 있으며, 공급라인(L1)을 통해 제1저장탱크(110) 내측에 마련된 열교환부(115) 쪽으로 액화에탄(C2) 증발가스를 공급한다. 이때, 공급라인(L1)에 압축기(122)가 마련되어 제2저장탱크(120)로부터 공급받은 액화에탄(C2) 증발가스를 압축하여 제1저장탱크(110) 내의 열교환부(115)로 보낼 수 있다. 제2저장탱크(120)는 예컨대 멤브레인형 탱크, SPB형 탱크를 포함할 수 있다.A plurality of second storage tanks 120 may be provided to store the liquefied ethane C2 and the liquefied ethane C2 may be evaporated into the heat exchanging unit 115 provided in the first storage tank 110 through the supply line L1. Gas is supplied. At this time, the compressor 122 is provided in the supply line L1 to compress the evaporated gas of the liquefied methane (C2) supplied from the second storage tank 120 to be sent to the heat exchange unit 115 in the first storage tank 110 have. The second storage tank 120 may include, for example, a membrane type tank, an SPB type tank.

이하, 상술한 내용을 기초로 액화에탄 증발가스 재액화 과정에 대해서 설명한다.Hereinafter, the liquefaction process of liquefied ethane-evaporated gas will be described on the basis of the above-mentioned contents.

먼저, 제2저장탱크(120)로부터 공급라인(L1)을 통해 공급된 액화에탄(C2) 증발가스와 제1저장탱크(110)에 저장된 LNG(C1) 간 제1저장탱크(110) 내측에 마련된 열교환부(115)에 의해 열교환이 수행된다.First, the liquefied methane (C2) evaporated gas supplied from the second storage tank 120 through the supply line L1 and the LNG C1 stored in the first storage tank 110 are introduced into the first storage tank 110 The heat exchange is performed by the heat exchanger 115 provided.

다음으로, 제2저장탱크(120)로부터 공급된 액화에탄(C2) 증발가스는 열교환부(115)를 거쳐 재액화되어 제1저장탱크(110) 내측에 마련된 내부탱크(130)에 저장된다.Next, the liquefied ethane (C2) evaporated gas supplied from the second storage tank 120 is re-liquefied through the heat exchanging unit 115 and stored in the internal tank 130 provided inside the first storage tank 110.

이후, 내부탱크(130)에 저장된 액화에탄은 이송펌프(117)에 의해 배출되어 회수라인(L2)을 통해 제2저장탱크(120)에 재저장된다.Thereafter, the liquefied ethane stored in the internal tank 130 is discharged by the transfer pump 117 and is restored to the second storage tank 120 through the recovery line L2.

상술한 실시 예에서는 LNG(C1)와 액화에탄(C2)을 예로 들어 설명하였으나, 이에 한정되는 것은 아니며, 액화점이 다른 다양한 이종의 액화가스에도 상술한 실시 예가 적용될 수 있다. 예컨대, 액화프로판, 액화부탄 등이 액화에탄(C2) 대신 사용될 수 있다. 이외에도 메탄보다 끊는점(또는 액화점)이 높고, 이송을 위해 액화과정이 필요한 다양한 물질들이 사용될 수 있다.In the above-described embodiments, the LNG (C1) and the liquefied ethane (C2) have been described as an example. However, the present invention is not limited to the LNG (C1) and the liquefied ethane (C2). For example, liquefied propane, liquefied butane, etc. may be used instead of liquefied ethane (C2). In addition, a variety of materials that have a higher breaking point (or liquefying point) than methane and require a liquefaction process for transport can be used.

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.The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

110: 제1저장탱크 120: 제2저장탱크
115: 열교환부 130: 내부탱크110: first storage tank 120: second storage tank
115: heat exchanger 130: inner tank

Claims (5)

제1액화가스를 저장하는 제1저장탱크;
상기 제1액화가스보다 액화점이 높은 제2액화가스를 저장하는 제2저장탱크;
상기 제1저장탱크 내측에 마련되며, 상기 제1저장탱크 내의 제1액화가스 또는 제1액화가스 증발가스와 상기 제2저장탱크로부터 공급받은 제2액화가스 증발가스 간 열교환이 수행되도록 하는 열교환부;
상기 제1저장탱크에 저장된 상기 제1액화가스에 잠기도록 상기 제1저장탱크 내측에 마련되며, 상기 제2액화가스 증발가스가 상기 열교환부를 거친 후 저장되는 내부탱크; 및
상기 내부탱크에 저장된 제2액화가스가 상기 제2저장탱크에 재저장되도록 하는 회수라인;을 포함하는 재액화 시스템.A first storage tank for storing the first liquefied gas;
A second storage tank for storing a second liquefied gas having a higher liquefaction point than the first liquefied gas;
A heat exchange unit provided inside the first storage tank for performing heat exchange between the first liquefied gas or the first liquefied gas evaporated gas in the first storage tank and the second liquefied gas evaporated gas supplied from the second storage tank, ;
An inner tank provided inside the first storage tank to be submerged in the first liquefied gas stored in the first storage tank and stored after the second liquefied gas evaporated gas passes through the heat exchange unit; And
And a recovery line for causing the second liquefied gas stored in the internal tank to be restored to the second storage tank. 제1항에 있어서,
상기 제2저장탱크로부터 공급된 제2액화가스 증발가스가 상기 열교환부를 거쳐 상기 내부탱크에 저장되도록 하는 공급라인과,
상기 내부탱크 내에 설치되고, 상기 회수라인을 통해 상기 내부탱크에 저장된 제2액화가스를 상기 제2저장탱크로 보내는 이송펌프를 더 포함하는 재액화 시스템.The method according to claim 1,
A supply line for allowing the second liquefied gas evaporated gas supplied from the second storage tank to be stored in the internal tank via the heat exchanger,
Further comprising a transfer pump installed in the inner tank for sending a second liquefied gas stored in the inner tank to the second storage tank through the recovery line. 제2항에 있어서,
상기 공급라인에 설치되고, 상기 제2저장탱크로부터 공급받은 제2액화가스 증발가스를 압축하여 상기 열교환부로 보내는 압축기를 더 포함하는 재액화 시스템.3. The method of claim 2,
And a compressor installed in the supply line for compressing the second liquefied gas evaporated gas supplied from the second storage tank and sending it to the heat exchanger. 제1항에 있어서,
상기 제1액화가스는 액화천연가스, 상기 제2액화가스는 액화에탄인 재액화 시스템.The method according to claim 1,
Wherein the first liquefied gas is liquefied natural gas and the second liquefied gas is liquefied ethane. 제1항 내지 제4항 중 어느 한 항에 따른 재액화 시스템을 포함하는 선박.A ship comprising a liquefaction system according to any one of claims 1 to 4.
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