KR20150005036A - System and method for treating boil-off gas for a ship - Google Patents

System and method for treating boil-off gas for a ship Download PDF

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Publication number
KR20150005036A
KR20150005036A KR20130078234A KR20130078234A KR20150005036A KR 20150005036 A KR20150005036 A KR 20150005036A KR 20130078234 A KR20130078234 A KR 20130078234A KR 20130078234 A KR20130078234 A KR 20130078234A KR 20150005036 A KR20150005036 A KR 20150005036A
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South Korea
Prior art keywords
lng
storage tank
gas
heat exchanger
compressed
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KR20130078234A
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Korean (ko)
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이준채
문영식
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대우조선해양 주식회사
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Priority to KR20130078234A priority Critical patent/KR20150005036A/en
Priority to PCT/KR2014/005976 priority patent/WO2015002491A1/en
Publication of KR20150005036A publication Critical patent/KR20150005036A/en

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    • 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
    • F17C9/04—Recovery of thermal energy
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/043—Localisation of the removal point in the gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/046—Localisation of the removal point in the liquid
    • F17C2223/047—Localisation of the removal point in the liquid with a dip tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/035—High pressure, i.e. between 10 and 80 bars
    • 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
    • F17C2227/0178—Arrangement in the vessel
    • 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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0306—Heat exchange with the fluid by heating 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
    • 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
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/046—Enhancing energy recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • 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

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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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

본 발명은, 저장탱크에 수용된 LNG를 재기화시켜 육상 수요처(shore)에 공급할 때, 저장탱크 내의 증발가스를 LNG의 냉열을 이용하여 재액화하여 저장탱크에 복귀시킴으로써 별도의 냉매 사이클을 가지는 재액화 장치를 이용하지 않고도 증발가스를 처리할 수 있는 선박의 증발가스 처리 시스템 및 방법에 관한 것이다.
본 발명에 따르면, 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비를 포함하는 선박에 설치되어 상기 저장탱크에서 발생하는 증발가스를 처리하기 위한 선박의 증발가스 처리 시스템으로서, 상기 저장탱크에서 배출된 증발가스를 압축시키기 위한 압축기와; 상기 압축기에서 압축된 증발가스를 냉각시키기 위한 열교환기; 를 포함하며, 상기 열교환기는, 상기 저장탱크에서 배출된 LNG를 수요처에서 요구하는 압력으로 압축시키는 고압펌프의 하류측에 설치되어, 상기 고압펌프에서 압축된 LNG의 냉열을 이용하여 상기 압축기에서 압축된 증발가스를 냉각시키는 것을 특징으로 하는 선박의 증발가스 처리 시스템과, 상기 시스템을 이용한 증발가스 처리 방법이 제공된다.The present invention resides in that when LNG stored in a storage tank is regenerated and supplied to a shore on land, the evaporated gas in the storage tank is re-liquefied by using the cold heat of the LNG and returned to the storage tank, To an evaporative gas treatment system and method for a ship capable of treating the evaporative gas without using the apparatus.
According to the present invention, there is provided an evaporative gas treatment system for a ship, which is installed in a ship including a regeneration facility for regenerating LNG stored in a storage tank and processes the evaporative gas generated in the storage tank, A compressor for compressing the evaporated gas; A heat exchanger for cooling the evaporated gas compressed in the compressor; Wherein the heat exchanger is installed downstream of a high-pressure pump for compressing the LNG discharged from the storage tank to a pressure required by a customer, and compresses the compressed LNG in the compressor using the LNG compressed by the high- A vaporized gas processing system for a ship, characterized by cooling the vaporized gas, and a method for treating the vaporized gas using the system.

Description

선박의 증발가스 처리 시스템 및 방법 {SYSTEM AND METHOD FOR TREATING BOIL-OFF GAS FOR A SHIP}TECHNICAL FIELD [0001] The present invention relates to a system and a method for treating a vapor of a ship,

본 발명은 선박의 증발가스 처리 시스템 및 방법에 관한 것으로서, 더욱 상세하게는 저장탱크에 수용된 LNG를 재기화시켜 육상 수요처(shore)에 공급할 때, 저장탱크 내의 증발가스를 LNG의 냉열을 이용하여 재액화하여 저장탱크에 복귀시킴으로써 별도의 냉매 사이클을 가지는 재액화 장치를 이용하지 않고도 증발가스를 처리할 수 있는 선박의 증발가스 처리 시스템 및 방법에 관한 것이다.The present invention relates to a system and a method for treating an evaporative gas of a ship, and more particularly, to a system and method for treating an evaporative gas of a ship, To an evaporative gas treatment system and method for a ship capable of treating an evaporative gas without using a re-liquefying apparatus having a separate refrigerant cycle by liquefying and returning to a storage tank.

근래, 천연가스의 소비량이 전 세계적으로 급증하고 있는 추세이다. 천연가스는, 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 또는, 액화된 액화천연가스의 상태로 LNG 캐리어(특히, LNG 운반선)에 저장된 채 원거리의 소비처로 운반된다. 액화천연가스는 천연가스를 극저온(대략 -163℃)으로 냉각하여 얻어지는 것으로 가스 상태의 천연가스일 때보다 그 부피가 대략 1/600로 줄어들므로 해상을 통한 원거리 운반에 매우 적합하다.In recent years, consumption of natural gas has been rapidly increasing worldwide. Natural gas is transported in a gaseous state via land or sea gas piping, or is transported to a distant consumer where it is stored in an LNG carrier (particularly an LNG carrier) in the state of liquefied natural gas. Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

LNG 운반선은, 액화천연가스를 싣고 바다를 운항하여 육상 소요처에 액화천연가스를 하역하기 위한 것이며, 이를 위해, 액화천연가스의 극저온에 견딜 수 있는 LNG 저장탱크(흔히, '화물창'이라 함)를 포함한다. 통상, 이러한 LNG 운반선은 LNG 저장탱크 내의 액화천연가스를 액화된 상태 그대로 육상에 하역하며, 하역된 LNG는 육상에 설치된 LNG 재기화 설비에 의해 재기화된 후 천연가스의 소비처로 가스배관을 통해 운반된다.LNG carriers are used to transport liquefied natural gas to the sea by carrying liquefied natural gas. For this purpose, LNG storage tanks (often referred to as 'cargo holds') capable of withstanding cryogenic temperatures of liquefied natural gas, . Generally, such LNG carrier cargoes liquefied natural gas in the LNG storage tank in the liquefied state on land, and the unloaded LNG is regenerated by the LNG regeneration facility installed on the land, and then transported through the gas pipeline to the consuming place of natural gas do.

이러한 육상의 LNG 재기화 설비는 천연가스 시장이 잘 형성되어 있어 안정적으로 천연가스의 수요가 있는 곳에 설치하는 경우에는 경제적으로 유리한 것으로 알려져 있다. 그러나, 천연가스의 수요가 계절적, 단기적 또는 주기적으로 있는 천연가스 소요처의 경우에는, 높은 설치비와 관리비로 인해, 육상에 LNG 재기화 설비를 설치하는 것이 경제적으로 매우 불리하다.These LNG regasification facilities on the land are known to be advantageous economically when the natural gas market is well established and it is installed in a stable natural gas demand place. However, it is economically disadvantageous to install LNG regasification facilities on land because of the high installation and maintenance costs, in the case of natural gas demand where natural gas demand is seasonal, short-term or periodic.

특히, 자연재해 등에 의해 육상의 LNG 재기화 설비가 파괴될 경우, LNG 운반선이 소요처에 LNG를 싣고 도달한다 하더라도, 그 LNG를 재기화할 수 없다는 점에서 기존 LNG 운반선을 이용한 천연가스 운반은 한계성을 안고 있다.Especially, when the LNG carrier is destroyed by natural disasters, even if the LNG carriers arrive at the destination with LNG, it is impossible to regenerate the LNG. It is holding.

이에 따라, 예를 들면, 해상 플랜트나 LNG 운반선에 LNG 재기화 설비를 마련하여, 해상에서 액화천연가스를 재기화하고, 그 재기화를 통해 얻어진 천연가스를 육상으로 공급하는 해상 LNG 재기화 시스템이 개발되었다.Accordingly, for example, an offshore LNG regasification system, in which an LNG regeneration facility is provided on a marine plant or an LNG carrier, regenerates liquefied natural gas at sea, and supplies the natural gas obtained from the regeneration to the land Developed.

극저온 상태의 액화가스를 저장할 수 있는 저장탱크와, 액화가스를 재기화하기 위한 재기화 설비가 설치된 선박으로는, LNG RV (Regasification Vessel)나 LNG FSRU (Floating Storage and Regasification Unit)와 같은 플랜트 등을 들 수 있다.A storage tank capable of storing liquefied gas at a cryogenic temperature and a ship having a regeneration facility for regenerating the liquefied gas include a plant such as an LNG RV (Regasification Vessel) or an LNG FSRU (Floating Storage and Regulation Unit) .

LNG RV는 자력 항해 및 부유가 가능한 액화가스 운반선에 LNG 재기화 설비를 설치한 것이고, LNG FSRU는 육상으로부터 멀리 떨어진 해상에서 LNG 운반선으로부터 하역되는 액화 천연가스를 저장탱크에 저장한 후 필요에 따라 액화 천연가스를 기화시켜 육상 수요처에 공급하는 해상 구조물이다. 본 명세서에서 선박이란, LNG RV를 비롯하여, LNG FSRU 등의 플랜트까지도 모두 포함하는 개념이다.LNG RV is a LNG regeneration facility installed on a liquefied gas carrier capable of self-sailing and floating. LNG FSRU stores liquefied natural gas unloaded from an LNG carrier in off-shore area in the storage tank, It is an offshore structure that supplies natural gas to the demand of the land. In the present specification, the term "ship" is a concept including both LNG RV and LNG FSRU.

천연가스의 액화온도는 상압에서 약 -163℃의 극저온이므로, LNG는 그 온도가 상압에서 -163℃ 보다 약간만 높아도 증발된다. LNG RV나 LNG FSRU 등의 선박에 설치되는 저장탱크는 단열처리가 되어 있기는 하지만, 외부의 열이 LNG에 지속적으로 전달되므로, LNG가 저장탱크 내에서 지속적으로 기화되어 저장탱크 내에 증발가스(BOG; Boil-Off Gas)가 발생한다.Since the liquefaction temperature of natural gas is a cryogenic temperature of about -163 ° C at normal pressure, LNG is evaporated even if its temperature is slightly higher than -163 ° C at normal pressure. Although the storage tanks installed in ships such as LNG RV and LNG FSRU are insulated, external heat is constantly transferred to the LNG, so that the LNG is constantly vaporized in the storage tank and the evaporation gas (BOG ; Boil-Off Gas) occurs.

종래, LNG RV나 LNG FSRU 등의 선박에 있어서, 저장탱크 내에서 발생한 BOG를 처리하기 위해 재기화시 재응축기에서 BOG를 LNG에 녹여 이를 육지로 공급하였다. 그런데, 재기화 용량이 적어 모든 BOG를 재응축시키지 못할 경우에는, 가스 연소기(GCU; Gas Comustion Unit)를 통해 연소시켜 버리거나, 그대로 대기중으로 방출(venting)시켜 버릴 수밖에 없었다.Conventionally, in ships such as LNG RV and LNG FSRU, BOG was melted in LNG and supplied to the land in the re-condenser in order to treat the BOG generated in the storage tank. However, if the re-condensation capacity is too low to recycle all the BOGs, they must be burned through a gas com- bustion unit (GCU) or vented to the atmosphere as it is.

이렇게 버려지는 천연가스를 절감하기 위해서, 별도의 냉매 사이클을 활용하는 재액화 장치를 설치하여 BOG를 재액화시킨 후 다시 저장탱크로 복귀시키는 방법이 제안되었다. 그러나, 재액화 장치를 사용할 경우, 선박의 제조비용이 증가하고, 공간이 한정된 선박 내에 재액화 장치를 설치할 공간을 확보해야 하고, 재액화시 소모되는 상당한 양의 에너지로 인해 운용비가 증가하는 문제가 있다.In order to reduce the natural gas to be discarded, a method of re-liquefying the BOG by re-liquefying a refrigerant cycle and returning it to the storage tank has been proposed. However, when the re-liquefying apparatus is used, the manufacturing cost of the ship is increased, a space for installing the re-liquefying apparatus in a ship having a limited space is secured, and a problem that the operating cost is increased due to a considerable amount of energy consumed in re-liquefaction have.

본 발명은 상기한 바와 같은 종래의 문제점을 해결하기 위한 것으로서, 저장탱크에 수용된 LNG를 재기화시켜 육상 수요처(shore)에 공급할 때, 저장탱크 내의 증발가스를 LNG의 냉열을 이용하여 재액화하여 저장탱크에 복귀시킴으로써 별도의 냉매 사이클을 가지는 재액화 장치를 이용하지 않고도 증발가스를 처리할 수 있는 선박의 증발가스 처리 시스템 및 방법을 제공하고자 하는 것이다.Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an LNG storage tank, It is an object of the present invention to provide an evaporative gas treatment system and method for a ship capable of treating an evaporative gas without using a re-liquefying apparatus having a separate refrigerant cycle by returning to a tank.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비를 포함하는 선박에 설치되어 상기 저장탱크에서 발생하는 증발가스를 처리하기 위한 선박의 증발가스 처리 시스템으로서, 상기 저장탱크에서 배출된 증발가스를 압축시키기 위한 압축기와; 상기 압축기에서 압축된 증발가스를 냉각시키기 위한 열교환기; 를 포함하며, 상기 열교환기는, 상기 저장탱크에서 배출된 LNG를 수요처에서 요구하는 압력으로 압축시키는 고압펌프의 하류측에 설치되어, 상기 고압펌프에서 압축된 LNG의 냉열을 이용하여 상기 압축기에서 압축된 증발가스를 냉각시키는 것을 특징으로 하는 선박의 증발가스 처리 시스템이 제공된다.According to an aspect of the present invention, there is provided an apparatus for recovering LNG stored in a storage tank, the apparatus including a regeneration unit for regenerating LNG stored in a storage tank, the evaporation gas 1. A treatment system comprising: a compressor for compressing an evaporated gas discharged from the storage tank; A heat exchanger for cooling the evaporated gas compressed in the compressor; Wherein the heat exchanger is installed downstream of a high-pressure pump for compressing the LNG discharged from the storage tank to a pressure required by a customer, and compresses the compressed LNG in the compressor using the LNG compressed by the high- And the evaporation gas is cooled.

상기 열교환기에서 냉각되어 재액화된 증발가스는 상기 저장탱크에 공급되어 저장되는 것이 바람직하다.The evaporated gas cooled and re-liquefied in the heat exchanger is preferably supplied to the storage tank and stored.

상기 열교환기에서 냉각되어 재액화된 증발가스를 감압시키기 위한 팽창밸브를 더 포함하는 것이 바람직하다.And an expansion valve for reducing the evaporated gas cooled in the heat exchanger and re-liquefied.

상기 증발가스 처리 시스템은, 상기 압축기에서 압축된 증발가스를 공급받아 소모하기 위한 DFDE 시스템을 더 포함하는 것이 바람직하다.Preferably, the evaporative gas processing system further includes a DFDE system for receiving and consuming the compressed evaporated gas in the compressor.

상기 증발가스 처리 시스템은, 상기 압축기에서 압축된 증발가스를 공급받아 소모하기 위한 GCU를 더 포함하는 것이 바람직하다.Preferably, the evaporative gas processing system further includes a GCU for receiving and consuming compressed evaporative gas from the compressor.

상기 열교환기에서 증발가스와의 열교환을 통해 가열된 LNG는 기화기에 의해 기화된 후 수요처에 공급되는 것이 바람직하다.The LNG heated through the heat exchange with the evaporation gas in the heat exchanger is preferably vaporized by the vaporizer and then supplied to the customer.

본 발명의 또 다른 측면에 따르면, LNG를 저장하는 저장탱크와; 상기 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비와; 상기 저장탱크에서 발생하는 증발가스를 처리하기 위하여 설치되는 상기 증발가스 처리 시스템; 을 포함하는 LNG RV가 제공된다.According to another aspect of the present invention, there is provided an LNG storage tank comprising: a storage tank for storing LNG; A regasification facility for regenerating the LNG stored in the storage tank; The evaporative gas processing system installed to process the evaporative gas generated in the storage tank; Lt; RTI ID = 0.0 > RV < / RTI >

본 발명의 또 다른 측면에 따르면, LNG를 저장하는 저장탱크와; 상기 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비와; 상기 저장탱크에서 발생하는 증발가스를 처리하기 위하여 설치되는 상기 증발가스 처리 시스템; 을 포함하는 LNG FSRU가 제공된다.According to another aspect of the present invention, there is provided an LNG storage tank comprising: a storage tank for storing LNG; A regasification facility for regenerating the LNG stored in the storage tank; The evaporative gas processing system installed to process the evaporative gas generated in the storage tank; Lt; RTI ID = 0.0 > FSRU. ≪ / RTI >

본 발명의 또 다른 측면에 따르면, 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비를 포함하는 선박에 설치되어 상기 저장탱크에서 발생하는 증발가스를 처리하기 위한 선박의 증발가스 처리 시스템에 의하여 증발가스를 처리하는 방법으로서, 상기 저장탱크에서 배출된 증발가스를 압축시키는 압축단계와; 상기 압축단계에서 압축된 증발가스를 냉각시키는 냉각단계; 를 포함하며, 상기 냉각단계는, 상기 저장탱크에서 배출된 LNG를 수요처에서 요구하는 압력으로 압축시키는 고압펌프의 하류측에 설치되는 열교환기에서, 상기 고압펌프에 의해 압축된 LNG의 냉열을 이용하여 상기 압축단계에서 압축된 증발가스를 냉각시키는 것을 특징으로 하는 선박의 증발가스 처리 방법이 제공된다.According to another aspect of the present invention, there is provided a method of controlling an LNG stored in a storage tank, the method comprising the steps of: evaporating a vapor of a vessel installed in a vessel including a regeneration facility for regenerating LNG stored in the storage tank, CLAIMS What is claimed is: 1. A method of treating a gas, comprising: compressing an evaporated gas discharged from the storage tank; A cooling step of cooling the evaporated gas compressed in the compressing step; Wherein the cooling step includes a cooling step of cooling the LNG discharged from the storage tank to a pressure required by a customer, And the evaporation gas compressed in the compressing step is cooled.

상기 열교환기에서 냉각되어 재액화된 증발가스는 감압된 후 상기 저장탱크에 공급되어 저장되는 것이 바람직하다.The evaporated gas cooled and re-liquefied in the heat exchanger is preferably supplied to the storage tank after being depressurized and stored.

상기 열교환기에서 증발가스와의 열교환을 통해 가열된 LNG는 기화된 후 수요처에 공급되는 것이 바람직하다.The LNG heated through the heat exchange with the evaporation gas in the heat exchanger is preferably vaporized and then supplied to the customer.

본 발명에 따르면, 저장탱크에 수용된 LNG를 재기화시켜 육상 수요처(shore)에 공급할 때, 저장탱크 내의 증발가스를 LNG의 냉열을 이용하여 재액화하여 저장탱크에 복귀시킬 수 있는 선박의 증발가스 처리 시스템 및 방법이 제공될 수 있다.According to the present invention, when the LNG stored in the storage tank is regenerated and supplied to the shore, the evaporative gas in the storage tank can be re-liquefied by using the cold heat of the LNG and returned to the storage tank. System and method can be provided.

그에 따라 본 발명의 증발가스 처리 시스템 및 방법에 의하면, 별도의 냉매 사이클을 가지는 재액화 장치를 이용하지 않고도 증발가스를 처리할 수 있게 된다.Therefore, according to the evaporation gas processing system and method of the present invention, the evaporation gas can be processed without using a re-liquefier having a separate refrigerant cycle.

또한, 본 발명의 증발가스 처리 시스템 및 방법에 의하면, 증발가스와 LNG 사이의 열교환을 위해 설치되는 열교환기가 펌프의 하류측에 위치되어 있기 때문에, 증발가스의 재액화를 위해 냉열을 빼앗긴 LNG가 부분적으로 기화되더라도 펌프에 악영향을 미칠 것을 우려하지 않아도 되고, 그에 따라 증발가스의 재액화 용량을 증가시킬 수 있게 된다.Further, according to the evaporative gas treatment system and method of the present invention, since the heat exchanger installed for the heat exchange between the evaporated gas and the LNG is located on the downstream side of the pump, the LNG, It is not necessary to worry about adverse effects on the pump, and thus the liquefaction capacity of the evaporated gas can be increased.

도 1은 본 발명에 따른 선박의 증발가스 처리 시스템을 도시한 개략 구성도이다.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a system for processing an evaporative gas of a ship according to the present invention; FIG.

이하, 본 발명의 바람직한 실시예에 따른 증발가스 처리 시스템을, 도면을 참조하여 상세하게 설명한다. 도 1에는 본 발명에 따른 선박의 증발가스 처리 시스템의 구성을 개략적으로 나타내는 도면이 도시되어 있다.Hereinafter, an evaporative gas processing system according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view schematically showing a configuration of a vapor gas treatment system for a ship according to the present invention.

도 1에 도시된 본 발명의 바람직한 실시예에 따른 증발가스 처리 시스템은, 저장탱크(11)에 LNG를 저장할 수 있으며, 저장된 LNG를 재기화시켜 육상의 수요처에 공급할 수 있는 선박에 적용된다.The evaporative gas treatment system according to the preferred embodiment of the present invention shown in FIG. 1 is capable of storing LNG in the storage tank 11 and is applied to a ship capable of regenerating the stored LNG to supply it to a demand place on the land.

극저온 상태의 액화가스를 저장할 수 있는 저장탱크와, 액화가스를 재기화하기 위한 재기화 설비가 설치된 선박으로는, LNG RV (Regasification Vessel)나 LNG FSRU (Floating Storage and Regasification Unit)와 같은 플랜트 등을 들 수 있다. LNG RV는 자력 항해 및 부유가 가능한 액화가스 운반선에 LNG 재기화 설비를 설치한 것이고, LNG FSRU는 육상으로부터 멀리 떨어진 해상에서 LNG 운반선으로부터 하역되는 액화 천연가스를 저장탱크에 저장한 후 필요에 따라 액화 천연가스를 기화시켜 육상 수요처에 공급하는 해상 구조물이다. 본 명세서에서 선박이란, LNG RV를 비롯하여, LNG FSRU 등의 플랜트까지도 모두 포함하는 개념이다.A storage tank capable of storing liquefied gas at a cryogenic temperature and a ship having a regeneration facility for regenerating the liquefied gas include a plant such as an LNG RV (Regasification Vessel) or an LNG FSRU (Floating Storage and Regulation Unit) . LNG RV is a LNG regeneration facility installed on a liquefied gas carrier capable of self-sailing and floating, and LNG FSRU stores liquefied natural gas unloaded from an LNG carrier in the sea off the sea, stored in a storage tank, It is an offshore structure that supplies natural gas to the demand of the land. In the present specification, the term "ship" is a concept including both LNG RV and LNG FSRU.

LNG의 재기화 공급을 위해, 본 발명에 따른 선박에는, 저장탱크(11)로부터 배출된 액화천연가스(LNG)를 이송라인을 따라 이송하면서 기화기(25)에서 기화시켜 소비처로 공급할 수 있도록 구성된 LNG 재기화 시스템이 구비된다.The vessel according to the present invention is provided with an LNG (Liquefied Natural Gas) configured to be able to vaporize the liquefied natural gas (LNG) discharged from the storage tank 11 along the transfer line while vaporizing the liquefied natural gas A re-ignition system is provided.

LNG 재기화 시스템은, 저장탱크(11) 내에 설치되어 저장된 LNG를 저장탱크의 외부로 배출시키기 위한 배출펌프(21)와, 이 배출펌프(21)에 의해 배출된 LNG를 더욱 높은 압력으로 압축시켜 기화기(25)에 공급하기 위한 고압펌프(23)를 포함한다.The LNG regasification system includes a discharge pump 21 for discharging the stored LNG stored in the storage tank 11 to the outside of the storage tank and an LNG discharged by the discharge pump 21 at a higher pressure And a high-pressure pump 23 for supplying the vaporized gas to the vaporizer 25.

고압펌프(23)에 의해 육상의 수요처에서 요구하는 압력(예컨대 100 bar)까지 압축된 LNG는 기화기(25)에서 기화된 후 수요처에 공급된다. 본 명세서에서 고압펌프의 "고압" 이란, 저장탱크(11)로부터 LNG를 배출시키는 배출펌프(21)에 의해 압축된 압력보다 높은 압력으로 LNG를 압축시킨다는 것을 의미하는 것이며, 고압의 범위가 특정되는 것은 아니다.The LNG compressed by the high-pressure pump 23 to a pressure (for example, 100 bar) demanded by the customer onshore is vaporized in the vaporizer 25 and then supplied to the customer. Means that the LNG is compressed at a pressure higher than the pressure compressed by the discharge pump 21 that discharges the LNG from the storage tank 11 and the range of the high pressure is specified It is not.

한편, 저장탱크는 LNG 등의 액화가스를 극저온 상태로 저장할 수 있도록 밀봉 및 단열 방벽을 갖추고 있지만, 외부로부터 전달되는 열을 완벽하게 차단할 수는 없다. 그에 따라 저장탱크(11) 내에서는 액화가스의 증발이 지속적으로 이루어지며, 저장탱크의 내부압력을 적정한 수준으로 유지하기 위해 저장탱크(11) 내부에서 발생하는 증발가스를 적절히 처리할 필요가 있다.On the other hand, the storage tank has a sealing and thermal barrier to store liquefied gas such as LNG in a cryogenic condition, but it can not completely block the heat transmitted from the outside. Accordingly, evaporation of the liquefied gas is continuously performed in the storage tank 11, and it is necessary to appropriately treat the evaporative gas generated in the storage tank 11 in order to maintain the internal pressure of the storage tank at an appropriate level.

본 발명에 따르면, 저장탱크(11) 내에서 발생한 증발가스는, 저장탱크로부터 배출된 후 압축기(13)에서 압축된 후 재액화되어 저장탱크(11)로 복귀된다. 이를 위해 LNG가 이송되는 라인에 있어서 고압펌프(23)와 기화기(25) 사이에는 열교환기(15)가 설치되며, 압축기(13)에서 압축된 증발가스는 열교환기(15)로 공급되어 LNG와 열교환된다.According to the present invention, the evaporated gas generated in the storage tank 11 is discharged from the storage tank, compressed in the compressor 13, and re-liquefied and returned to the storage tank 11. A heat exchanger 15 is provided between the high pressure pump 23 and the vaporizer 25 in the line through which the LNG is transferred and the evaporated gas compressed by the compressor 13 is supplied to the heat exchanger 15, Heat exchanged.

고압펌프(23)에 의해 압축된 LNG는 기화기(25)에서 기화되기 전에 열교환기(15)에서 증발가스에 의해 가열되고, 압축기(13)에 의해 압축된 증발가스는 열교환기(15)에서 LNG의 냉열을 빼앗아 냉각됨으로써 재액화될 수 있다. 액화된 증발가스는 팽창밸브(17)를 통과하면서 감압된 후 저장탱크(11)로 복귀되어 저장된다.The LNG compressed by the high-pressure pump 23 is heated by the evaporating gas in the heat exchanger 15 before being vaporized in the vaporizer 25 and the evaporated gas compressed by the compressor 13 is heated in the heat exchanger 15 by the LNG It can be re-liquefied by being cooled. The liquefied evaporated gas is decompressed while passing through the expansion valve (17), and returned to the storage tank (11) and stored.

열교환기(15)에 의해 재액화될 수 있는 처리용량 이상의 증발가스가 발생하는 경우, 압축기(13)에서 압축된 증발가스 중 적어도 일부를 DFDE(Dual Fuel Diesel Electric) 시스템 또는 GCU(Gas Combustion Unit)로 공급하여 소모시킬 수 있다. 또한, 필요하다면 증발가스를 그대로 대기중에 방출(venting)시킬 수도 있다.At least a part of the evaporated gas compressed in the compressor 13 is supplied to a dual fuel diesel electric electric system (DFDE) system or a gas combustion unit (GCU) when the evaporated gas above the processing capacity that can be re-liquefied by the heat exchanger 15 is generated. To be consumed. In addition, if necessary, the evaporation gas may be vented to the atmosphere as it is.

본 발명과 같이 LNG의 냉열을 이용하여 증발가스를 재액화시킴으로써 처리하는 방법은, 재응축기를 통하여 LNG에 증발가스를 녹여 함께 기화기로 공급하는 방법에 비해 더 많은 양의 BOG를 처리할 수 있으며, 이에 따라 GCU에서 연소시켜 버리거나 대기중에 그대로 방출시켜 버리는 증발가스의 양을 감소시킬 수 있다.The method of treating the evaporation gas by re-liquefaction using the cold heat of the LNG as in the present invention can treat a larger amount of BOG than the method of dissolving the evaporation gas in the LNG and feeding it to the vaporizer through the recondenser, Accordingly, it is possible to reduce the amount of the evaporative gas that is burned in the GCU or released as it is in the air.

또한, 본 발명에 따르면, 냉매를 사용하여 증발가스를 재액화시키는 별도의 재액화 장치(즉, 냉매 사이클)를 구비할 필요가 없으므로, 재액화 장치의 설치 및 운용에 소요되는 비용과 노력을 절감할 수 있다.Further, according to the present invention, there is no need to provide a separate re-liquefying device (i.e., a refrigerant cycle) for re-liquefying the evaporation gas using the refrigerant, thereby reducing the cost and effort required for installing and operating the re-liquefying device .

본 발명에 따른 선박의 증발가스 처리 시스템은, 기화기(25)에 공급되는 LNG와 저장탱크(11)에서 배출된 증발가스와의 열교환을 위해 고압펌프(23)의 하류측에 설치되는 열교환기(15)를 포함한다. 이와 같이 LNG의 냉열을 이용하여 증발가스를 재액화시키는 열교환기(15)가 고압펌프(23)의 하류측에 설치되어 있기 때문에, 고압펌프의 손상에 대한 우려 없이 LNG의 냉열을 충분히 활용할 수 있다.The evaporation gas processing system of the present invention comprises a heat exchanger (not shown) installed downstream of the high-pressure pump 23 for heat exchange between the LNG supplied to the vaporizer 25 and the evaporated gas discharged from the storage tank 11 15). As described above, since the heat exchanger 15 for re-liquefying the evaporation gas by using the cold heat of the LNG is provided on the downstream side of the high-pressure pump 23, it is possible to fully utilize the cooling and heating of the LNG without fear of damaging the high-pressure pump.

펌프의 경우, 액체 상태의 물질만을 압축시킬 수 있으며, 기체 상태의 물질이 유입되면 손상을 입을 수 있다. 특히, LNG는 극저온 상태의 액체이므로, LNG를 압축시키는 고압펌프는 기체 상태의 물질이 유입될 경우, 더욱 큰 손상을 입을 수 있다. 그에 따라 고압펌프의 상류측에 열교환기를 배치시킬 경우, LNG가 조금이라도 기화되는 것을 방지하기 위해 재액화시킬 수 있는 증발가스의 양을 제한하여야 하므로, LNG의 냉열을 충분히 활용할 수 없다.In the case of a pump, it is possible to compress only the liquid material, and if gaseous material is introduced, it may be damaged. Particularly, since LNG is a liquid at a cryogenic temperature, a high-pressure pump for compressing LNG may be further damaged when gaseous substances are introduced. Accordingly, when the heat exchanger is disposed on the upstream side of the high-pressure pump, the amount of evaporative gas that can be re-liquefied is limited in order to prevent vaporization of even a small amount of LNG.

그러나 본 발명에 따르면, LNG와 증발가스 사이의 열교환을 위한 열교환기(15)를 고압펌프(23)의 하류측에 설치함으로써, 열교환기에서 가열된 LNG가 일부 기화되어도 고압펌프에 영향을 미치지 않게 한다. 그에 따라 동일한 조건에서 고압펌프의 상류측에 열교환기를 배치한 경우에 비해 대략 7% 정도의 증발가스를 더 재액화시킬 수 있게 된다.However, according to the present invention, by providing the heat exchanger 15 for heat exchange between the LNG and the evaporation gas on the downstream side of the high-pressure pump 23, even if the LNG heated in the heat exchanger is partially vaporized, do. Accordingly, approximately 7% of the evaporation gas can be further liquefied in comparison with the case where the heat exchanger is disposed on the upstream side of the high-pressure pump under the same conditions.

본 발명은 상기 실시예에 한정되지 않고 본 발명의 기술적 요지를 벗어나지 아니하는 범위 내에서 다양하게 수정 또는 변형되어 실시될 수 있음은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 있어서 자명한 것이다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

11 : 저장탱크 13 : 압축기
15 : 열교환기 17 : 팽창밸브
21 : 배출펌프 23 : 고압펌프
25 : 기화기11: Storage tank 13: Compressor
15: heat exchanger 17: expansion valve
21: exhaust pump 23: high-pressure pump
25: vaporizer

Claims (11)

저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비를 포함하는 선박에 설치되어 상기 저장탱크에서 발생하는 증발가스를 처리하기 위한 선박의 증발가스 처리 시스템으로서,
상기 저장탱크에서 배출된 증발가스를 압축시키기 위한 압축기와;
상기 압축기에서 압축된 증발가스를 냉각시키기 위한 열교환기;
를 포함하며,
상기 열교환기는, 상기 저장탱크에서 배출된 LNG를 수요처에서 요구하는 압력으로 압축시키는 고압펌프의 하류측에 설치되어, 상기 고압펌프에서 압축된 LNG의 냉열을 이용하여 상기 압축기에서 압축된 증발가스를 냉각시키는 것을 특징으로 하는 선박의 증발가스 처리 시스템.An evaporative gas treatment system for a ship, which is installed in a vessel including a regeneration facility for regenerating LNG stored in a storage tank and processes the evaporation gas generated in the storage tank,
A compressor for compressing the evaporated gas discharged from the storage tank;
A heat exchanger for cooling the evaporated gas compressed in the compressor;
/ RTI >
The heat exchanger is installed downstream of a high pressure pump that compresses the LNG discharged from the storage tank to a pressure demanded by a customer, and uses the cold heat of the LNG compressed in the high pressure pump to cool the evaporated gas compressed in the compressor And the evaporation gas processing system of the ship. 청구항 1에 있어서,
상기 열교환기에서 냉각되어 재액화된 증발가스는 상기 저장탱크에 공급되어 저장되는 것을 특징으로 하는 선박의 증발가스 처리 시스템.The method according to claim 1,
And the evaporated gas cooled and re-liquefied in the heat exchanger is supplied to and stored in the storage tank. 청구항 2에 있어서,
상기 열교환기에서 냉각되어 재액화된 증발가스를 감압시키기 위한 팽창밸브를 더 포함하는 것을 특징으로 하는 선박의 증발가스 처리 시스템.The method of claim 2,
Further comprising an expansion valve for reducing the evaporated gas cooled by the heat exchanger and re-liquefied. 청구항 1에 있어서,
상기 압축기에서 압축된 증발가스를 공급받아 소모하기 위한 DFDE 시스템을 더 포함하는 것을 특징으로 하는 선박의 증발가스 처리 시스템.The method according to claim 1,
Further comprising a DFDE system for receiving and consuming compressed evaporated gas from the compressor. 청구항 1에 있어서,
상기 압축기에서 압축된 증발가스를 공급받아 소모하기 위한 GCU를 더 포함하는 것을 특징으로 하는 선박의 증발가스 처리 시스템.The method according to claim 1,
Further comprising a GCU for receiving and consuming the compressed evaporated gas in the compressor. 청구항 1에 있어서,
상기 열교환기에서 증발가스와의 열교환을 통해 가열된 LNG는 기화기에 의해 기화된 후 수요처에 공급되는 것을 특징으로 하는 선박의 증발가스 처리 시스템.The method according to claim 1,
Wherein the LNG heated through the heat exchange with the evaporation gas in the heat exchanger is vaporized by the vaporizer and then supplied to the customer. LNG를 저장하는 저장탱크와;
상기 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비와;
상기 저장탱크에서 발생하는 증발가스를 처리하기 위하여 설치되는 청구항 1 내지 청구항 6 중 어느 한 항에 따른 증발가스 처리 시스템;
을 포함하는 LNG RV.A storage tank for storing LNG;
A regasification facility for regenerating the LNG stored in the storage tank;
The evaporative gas processing system according to any one of claims 1 to 6, which is installed for processing evaporative gas generated in the storage tank.
The LNG RV. LNG를 저장하는 저장탱크와;
상기 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비와;
상기 저장탱크에서 발생하는 증발가스를 처리하기 위하여 설치되는 청구항 1 내지 청구항 6 중 어느 한 항에 따른 증발가스 처리 시스템;
을 포함하는 LNG FSRU.A storage tank for storing LNG;
A regasification facility for regenerating the LNG stored in the storage tank;
The evaporative gas processing system according to any one of claims 1 to 6, which is installed for processing evaporative gas generated in the storage tank.
The LNG FSRU. 저장탱크에 저장된 LNG를 재기화시키기 위한 재기화 설비를 포함하는 선박에 설치되어 상기 저장탱크에서 발생하는 증발가스를 처리하기 위한 선박의 증발가스 처리 시스템에 의하여 증발가스를 처리하는 방법으로서,
상기 저장탱크에서 배출된 증발가스를 압축시키는 압축단계와;
상기 압축단계에서 압축된 증발가스를 냉각시키는 냉각단계;
를 포함하며,
상기 냉각단계는, 상기 저장탱크에서 배출된 LNG를 수요처에서 요구하는 압력으로 압축시키는 고압펌프의 하류측에 설치되는 열교환기에서, 상기 고압펌프에 의해 압축된 LNG의 냉열을 이용하여 상기 압축단계에서 압축된 증발가스를 냉각시키는 것을 특징으로 하는 선박의 증발가스 처리 방법.1. A method for processing an evaporative gas by a vapor-processing system of a ship installed in a vessel including a re-vaporization facility for re-vaporizing LNG stored in a storage tank, for processing an evaporative gas generated in the storage tank,
A compression step of compressing the evaporated gas discharged from the storage tank;
A cooling step of cooling the evaporated gas compressed in the compressing step;
/ RTI >
Wherein the cooling step includes a cooling step of cooling the LNG discharged from the storage tank to a pressure required by a customer, And cooling the compressed evaporated gas. 청구항 9에 있어서,
상기 열교환기에서 냉각되어 재액화된 증발가스는 감압된 후 상기 저장탱크에 공급되어 저장되는 것을 특징으로 하는 선박의 증발가스 처리 방법.The method of claim 9,
Wherein the evaporated gas cooled and re-liquefied in the heat exchanger is decompressed and then supplied to and stored in the storage tank. 청구항 9에 있어서,
상기 열교환기에서 증발가스와의 열교환을 통해 가열된 LNG는 기화된 후 수요처에 공급되는 것을 특징으로 하는 선박의 증발가스 처리 방법.The method of claim 9,
Wherein the LNG heated through the heat exchange with the evaporating gas in the heat exchanger is vaporized and then supplied to the customer.
KR20130078234A 2013-07-04 2013-07-04 System and method for treating boil-off gas for a ship KR20150005036A (en)

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