KR102040005B1 - Fuel gas supply system - Google Patents

Fuel gas supply system Download PDF

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Publication number
KR102040005B1
KR102040005B1 KR1020180073574A KR20180073574A KR102040005B1 KR 102040005 B1 KR102040005 B1 KR 102040005B1 KR 1020180073574 A KR1020180073574 A KR 1020180073574A KR 20180073574 A KR20180073574 A KR 20180073574A KR 102040005 B1 KR102040005 B1 KR 102040005B1
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KR
South Korea
Prior art keywords
gas
heat exchange
supplied
fresh
line
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KR1020180073574A
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Korean (ko)
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이원두
최병윤
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삼성중공업 주식회사
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Publication of KR102040005B1 publication Critical patent/KR102040005B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262—Details of the cold heat exchange system
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • B63B2770/00—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—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
    • F17C2227/0339—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
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • 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
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a 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
    • F17C2265/031—Treating the boil-off by discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/06—Splitting of the feed stream, e.g. for treating or cooling in different ways
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

Abstract

Disclosed is a fuel gas supply system. According to the embodiment of the present invention, the fuel gas supply system includes: a compression unit compressing evaporation gas of liquefied gas supplied from a storage tank to a first demander through an evaporation gas supply line; a first heat exchange unit exchanging heat with the evaporation gas supplied from the storage tank by receiving a part of the compressed evaporation gas through a reliquefaction line; a second heat exchange unit receiving fresh gas through a fresh gas supply line from a first gas-liquid separation device separating gas and liquid of the compressed evaporation gas decompressed by a first decompression valve after passing through the first heat exchange unit, wherein the second heat exchange unit supplies the fresh gas to a second demander by exchanging the heat of the fresh gas with the evaporation gas compressed and supplied through a branch line branching from a front end of the first heat exchange unit of the reliquefaction line; a first temperature sensor and a second temperature sensor, individually measuring the temperature of the evaporation gas compressed and passing through the second heat exchange unit and the temperature of the fresh gas flowing into the second heat exchange unit or the temperature of the fresh gas passing through the second heat exchange unit and the temperature of the evaporation gas compressed and flowing into the second heat exchange unit; and a branch gas control valve controlling the amount of evaporation gas compressed and supplied through the branch line for the difference of the temperature measured by the first temperature sensor and the second temperature sensor to be maintained within a setting range.

Description

연료가스 공급시스템{FUEL GAS SUPPLY SYSTEM}Fuel gas supply system {FUEL GAS SUPPLY SYSTEM}

본 발명은 연료가스 공급시스템에 관한 것이다.The present invention relates to a fuel gas supply system.

온실가스 및 각종 대기오염 물질의 배출에 대한 국제해사기구(IMO)의 규제가 강화됨에 따라 조선 및 해운업계에서는 기존 연료인 중유, 디젤유의 이용을 대신하여, 청정 에너지원인 천연가스를 선박의 연료가스로 이용하는 경우가 많아지고 있다.With the tightening of the International Maritime Organization (IMO) regulations on the emission of greenhouse gases and various air pollutants, the shipbuilding and shipping industries use natural gas, a clean energy source, instead of using heavy fuel oil and diesel oil. In many cases it is used.

연료가스 중에서 널리 이용되고 있는 천연가스(Natural Gas)는 메탄(Methane)을 주성분으로 하며, 통상적으로 그 부피를 1/600로 줄인 액화가스(Liquefied Gas) 상태로 변화되어 저장 및 운반되고 있다.Natural gas, which is widely used among fuel gases, contains methane as a main component, and is changed to a liquefied gas in which the volume is reduced to 1/600, and is stored and transported.

액화가스를 운반하는 선박은 액화가스를 저장할 수 있도록 단열 처리된 저장탱크를 구비한다. 또, 이러한 선박은 저장탱크에서 자연적으로 발생하는 증발가스(Boiled Off Gas) 또는 저장탱크의 액화가스를 기화시켜 엔진의 연료로 공급하는 연료가스 공급시스템을 마련할 수 있다. 선박의 엔진에는 DFDE(Dual Fuel Disel Electric) 엔진 등과 같은 저압(약 5~8bar)의 분사엔진, ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압(약 150~400bar)의 분사엔진 및 중압(약 16~18bar)의 연료가스로 연소가 가능한 중압가스 분사엔진이 이용될 수 있다.Ships carrying liquefied gas are provided with a storage tank insulated to store the liquefied gas. In addition, such a vessel may provide a fuel gas supply system for vaporizing a boiled off gas or a liquefied gas naturally occurring in a storage tank and supplying the fuel to an engine. Engines of ships include low pressure (approx. 5-8 bar) injection engines such as DFDE (Dual Fuel Disel Electric) engines, high pressure (approx. 150-400 bar) injection engines such as ME-GI engines (Gas Injection engines from Man B & W), and A medium pressure gas injection engine capable of burning with a medium pressure (about 16-18 bar) fuel gas may be used.

종래의 연료가스 공급시스템은 예컨대 ME-GI 엔진(제1수요처)이 필요로 하는 연료소모량보다 많은 증발가스가 공급된 경우, 해당 잉여분의 증발가스를 열교환부를 통해 저장탱크로부터 공급된 증발가스와 열교환시키고, 이후 감압한 후 기액분리기에 의해 기액 분리시킨다. 그리고, 기액분리기에 의해 분리된 액체성분은 회수하여 저장탱크에 저장하고, 분리된 기체성분의 프레시가스(fresh gas)는 상술한 열교환부를 거치도록 하여 재액화 효율을 높이는 데에 이용되도록 한 후, 발전엔진(제2수요처)의 연료로 공급할 수 있다.In the conventional fuel gas supply system, when more evaporated gas is supplied than the fuel consumption required by the ME-GI engine (first demand), the excess evaporated gas is exchanged with the evaporated gas supplied from the storage tank through the heat exchanger. After depressurizing, gas-liquid separation is carried out by gas-liquid separator. Then, the liquid component separated by the gas-liquid separator is recovered and stored in a storage tank, and the fresh gas of the separated gas component passes through the heat exchanger described above to be used to increase the re-liquefaction efficiency, Can be supplied as fuel for power generation engines (second-demand)

그러나, 저장탱크로부터 공급되는 증발가스는 메탄과 질소를 포함하고, 선박을 운항함에 따라 증발가스 내의 질소농도가 점차 감소할 수 있으며, 이에 따라 상술한 기액분리기에서 발생하는 프레시가스의 양이 줄어들게 된다.However, the boil-off gas supplied from the storage tank includes methane and nitrogen, and the nitrogen concentration in the boil-off gas may gradually decrease as the ship operates, thereby reducing the amount of fresh gas generated in the above-described gas-liquid separator. .

이와 같이, 유량이 줄어든 프레시가스를 열교환부로 공급할 경우, 열교환부의 열교환 성능이 떨어질 수 있다.As such, when the fresh gas having a reduced flow rate is supplied to the heat exchange part, heat exchange performance of the heat exchange part may be deteriorated.

관련된 종래 기술로서 한국등록특허 제10-1380427호(2014.03.26. 등록)를 참조하기 바란다.Please refer to Korean Patent Registration No. 10-1380427 (registered on March 26, 2014) as a related prior art.

한국등록특허 제10-1380427호(2014.03.26. 등록)Korea Registered Patent No. 10-1380427 (registered on March 26, 2014)

본 발명의 실시 예는 열교환부의 재액화 효율을 향상시킬 수 있는 연료가스 공급시스템을 제공하고자 한다.An embodiment of the present invention is to provide a fuel gas supply system that can improve the re-liquefaction efficiency of the heat exchange unit.

본 발명의 일 측면에 따르면, 저장탱크로부터 공급받은 액화가스의 증발가스를 압축시켜 증발가스공급라인을 통해 제1수요처로 공급하는 압축부; 상기 압축된 증발가스 중 일부를 재액화라인을 통해 공급받아 상기 저장탱크로부터 공급된 증발가스와 열교환을 수행하는 제1열교환부; 상기 제1열교환부를 통과한 후 제1감압밸브에 의해 감압된 상기 압축된 증발가스를 기액 분리시킨 제1기액분리기로부터 프레시가스공급라인을 통해 프레시가스를 공급받아, 상기 재액화라인의 상기 제1열교환부 전단으로부터 분기된 분기라인을 통해 공급된 상기 압축된 증발가스와 열교환을 수행하여 제2수요처로 공급하는 제2열교환부; 상기 제2열교환부를 통과한 상기 프레시가스의 온도 및 상기 제2열교환부로 유입되는 상기 압축된 증발가스의 온도 또는 상기 제2열교환부로 유입되는 상기 프레시가스의 온도 및 상기 제2열교환부를 통과한 상기 압축된 증발가스의 온도를 각각 측정하는 제1온도센서와 제2온도센서; 및 상기 제1온도센서와 제2온도센서에 의해 측정된 온도의 차가 설정범위 내로 유지되도록 상기 분기라인을 통해 공급되는 상기 압축된 증발가스의 양을 조절하는 분기가스조절밸브;를 포함하는 연료가스 공급시스템이 제공될 수 있다.According to an aspect of the invention, the compression unit for compressing the evaporation gas of the liquefied gas supplied from the storage tank to supply to the first demand through the evaporation gas supply line; A first heat exchanger configured to receive a portion of the compressed boil-off gas through a reliquefaction line and perform heat exchange with the boil-off gas supplied from the storage tank; Fresh gas is supplied through the fresh gas supply line from the first gas-liquid separator in which the compressed boil-off gas decompressed by the first pressure reducing valve and gas-liquid separated after passing through the first heat exchanger, is supplied to the first liquid in the reliquefaction line. A second heat exchanger configured to perform heat exchange with the compressed boil-off gas supplied through a branch line branched from the front end of the heat exchanger to supply to a second demand; The temperature of the fresh gas passing through the second heat exchange part and the temperature of the compressed boil-off gas flowing into the second heat exchange part or the temperature of the fresh gas flowing into the second heat exchange part and the compression passing through the second heat exchange part A first temperature sensor and a second temperature sensor respectively measuring the temperature of the evaporated gas; And a branch gas control valve configured to adjust the amount of the compressed boil-off gas supplied through the branch line so that the difference between the temperatures measured by the first temperature sensor and the second temperature sensor is maintained within a set range. Supply systems may be provided.

상기 재액화라인은 상기 압축부, 제1열교환부, 제1감압밸브 및 상기 제1기액분리기를 연결하고, 상기 분기라인은 상기 재액화라인의 상기 제1열교환부 전단으로부터 분기되어 상기 제2열교환부 및 상기 재액화라인의 상기 제1열교환부 후단과 연결되며, 상기 프레시가스공급라인은 상기 제1기액분리기, 제1열교환부 및 제2수요처를 연결하고, 상기 제1온도센서와 제2온도센서는 각각 상기 프레시가스공급라인의 상기 제2열교환부 후단 및 상기 분기라인의 상기 제2열교환부 전단에 마련되거나, 상기 프레시가스공급라인의 상기 제2열교환부 전단 및 상기 분기라인의 상기 제2열교환부 후단에 마련될 수 있다.The reliquefaction line connects the compression part, the first heat exchange part, the first pressure reducing valve, and the first gas-liquid separator, and the branching line branches from the front end of the first heat exchange part of the reliquefaction line to the second heat exchange. Part and a rear end of the first heat exchange part of the reliquefaction line, the fresh gas supply line connects the first gas-liquid separator, the first heat exchange part, and the second user, and the first temperature sensor and the second temperature. Sensors are respectively provided after the second heat exchange part of the fresh gas supply line and before the second heat exchange part of the branch line, or before the second heat exchange part of the fresh gas supply line and the second of the branch line. It may be provided after the heat exchanger.

상기 제1기액분리기로부터 분리된 액체성분을 공급받아 설정된 압력으로 감압시키는 제2감압밸브와, 상기 감압된 액체성분을 기액 분리시키는 제2기액분리기를 더 포함하되, 상기 제2기액분리기에 의해 분리된 프레시가스는 상기 증발가스공급라인의 상기 압축부 전단으로 공급되고, 상기 제2기액분리기에 의해 분리된 액체성분은 상기 저장탱크로 회수될 수 있다.A second pressure reducing valve for receiving a liquid component separated from the first gas liquid separator to reduce the pressure to a set pressure, and a second gas liquid separator for gas-liquid separating the reduced liquid component, separated by the second gas liquid separator The fresh gas is supplied to the front end of the compression section of the evaporative gas supply line, and the liquid component separated by the second gas-liquid separator may be recovered to the storage tank.

본 발명의 실시 예에 따른 연료가스 공급시스템은 열교환부의 재액화 효율을 향상시킬 수 있다.Fuel gas supply system according to an embodiment of the present invention can improve the re-liquefaction efficiency of the heat exchange unit.

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 above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 실시 예에 따른 연료가스 공급시스템을 나타낸다.
도 2는 도 1에 도시된 연료가스 공급시스템에서 프레시가스공급라인의 제2열교환부 전단 및 분기라인의 제2열교환부 후단에 제1온도센서 및 제2온도센서가 각각 마련된 형태를 나타낸다.1 shows a fuel gas supply system according to an embodiment of the present invention.
FIG. 2 illustrates a form in which the first temperature sensor and the second temperature sensor are provided at the front of the second heat exchanger of the fresh gas supply line and at the rear of the second heat exchanger of the branch line in the fuel gas supply system of FIG.

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

도 1을 참조하면, 본 발명의 실시 예에 따른 연료가스 공급시스템(100)은 수요처로 안정적으로 연료를 공급하며, 예컨대 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 fuel gas supply system 100 according to an embodiment of the present invention stably supplies fuel to a demand destination, for example, various liquefied fuel carrier ships, liquefied fuel RV (regasification vessels), container ships, general merchant ships, It can be applied to ships including LNG Floating, Production, Storage and Off-loading (FPSO), LNG Floating Storage and Regasification Unit (FSRU).

연료가스 공급시스템(100)은 저장탱크(110)로부터 공급받은 액화가스의 증발가스를 압축시켜 증발가스공급라인(L1)을 통해 제1수요처(E1)로 공급하는 압축부(120)와, 압축부(120)에 의해 압축된 증발가스 중 일부를 재액화라인(L2)을 통해 공급받아 저장탱크(110)로부터 공급된 증발가스와 열교환을 수행하는 제1열교환부(130)와, 제1열교환부(130)를 통과한 후 제1감압밸브(201)에 의해 감압된 상술한 압축된 증발가스를 기액 분리시킨 제1기액분리기(140)로부터 프레시가스공급라인(L3)을 통해 프레시가스를 공급받아, 재액화라인(L2)의 제1열교환부(130) 전단으로부터 분기된 분기라인(L4)을 통해 공급된 압축된 증발가스와 열교환을 수행하여 상술한 열교환된 프레시가스를 프레시가스공급라인(L3)을 통해 제2수요처(E2)로 공급하는 제2열교환부(150)와, 압축부(120)의 설정구간으로부터 분기되어 제2수요처(E2)로 설정압력으로 압축된 증발가스를 공급하는 압축가스공급라인(L5)에 마련되며, 제2수요처(E2)로 공급되는 압축된 증발가스의 양을 조절하는 압축가스공급밸브(202)와, 프레시가스공급라인(L3)의 제2열교환부(150) 전단에 마련되어, 제2열교환부(150)를 거쳐 제2수요처(E2)로 공급되는 프레시가스의 양을 조절하는 프레시가스공급밸브(203)를 포함한다.The fuel gas supply system 100 compresses the boil-off gas of the liquefied gas supplied from the storage tank 110 and supplies the compressed portion 120 to supply the first demand E1 through the boil-off gas supply line L1, and compression. A first heat exchanger 130 for receiving a portion of the boil-off gas compressed by the unit 120 through the reliquefaction line (L2) to perform heat exchange with the boil-off gas supplied from the storage tank 110, the first heat exchange The fresh gas is supplied through the fresh gas supply line L3 from the first gas-liquid separator 140 in which the above-mentioned compressed boil-off gas is separated by the first pressure reducing valve 201 and then gas-liquid separated after passing through the unit 130. Receiving, by performing a heat exchange with the compressed boil-off gas supplied through the branch line (L4) branched from the front end of the first heat exchange unit 130 of the reliquefaction line (L2) to the fresh heat exchanged fresh gas (fresh gas supply line ( Installation of the second heat exchanger 150 and the compression unit 120 supplied to the second demand E2 through L3). It is provided in the compressed gas supply line (L5) for branching from the section to supply the boil-off gas compressed at the set pressure to the second demand (E2), and adjusts the amount of compressed boil-off gas supplied to the second demand (E2) The amount of fresh gas provided at the front end of the second heat exchange part 150 of the compressed gas supply valve 202 and the fresh gas supply line L3 and supplied to the second demand E2 via the second heat exchange part 150. It includes a fresh gas supply valve 203 for adjusting the.

또, 연료가스 공급시스템(100)은 압축가스공급라인(L5)에 마련되며, 제2수요처(E2)의 연료소모량에 따른 압력을 측정하는 압력측정기(160)와, 압력측정기(160)에 의해 측정된 압력에 따라 압축가스공급밸브(202) 및 프레시가스공급밸브(203) 중 하나 이상을 제어하여, 제2수요처(E2)의 연료소모량에 따라 적정량의 연료가 공급되도록 하는 제어부(170)를 포함한다.In addition, the fuel gas supply system 100 is provided in the compressed gas supply line (L5), by the pressure measuring unit 160 and the pressure measuring unit 160 for measuring the pressure according to the fuel consumption amount of the second demand (E2) The control unit 170 for controlling the at least one of the compressed gas supply valve 202 and the fresh gas supply valve 203 in accordance with the measured pressure to supply the appropriate amount of fuel in accordance with the fuel consumption of the second demand (E2). Include.

또, 연료가스 공급시스템(100)은 제1기액분리기(140)로부터 분리된 액체성분을 공급받아 설정된 압력으로 감압시키는 제2감압밸브(206)와, 제2감압밸브(206)에 의해 감압된 액체성분을 기액 분리시키는 제2기액분리기(180)를 포함한다. 제1기액분리기(140), 제2감압밸브(206) 및 제2기액분리기(180)는 기액분리라인(L6)으로 연결되고, 기액분리라인(L6)의 제2감압밸브(206) 전단에는 액체성분공급밸브(207)가 마련된다.In addition, the fuel gas supply system 100 is supplied with a liquid component separated from the first gas-liquid separator 140 to reduce the pressure to a set pressure and a second pressure reducing valve 206, the pressure is reduced by the second pressure reducing valve 206 And a second gas-liquid separator 180 for gas-liquid separation of the liquid component. The first gas-liquid separator 140, the second pressure reducing valve 206, and the second gas-liquid separator 180 are connected to the gas-liquid separation line L6, and in front of the second pressure-reducing valve 206 of the gas-liquid separation line L6. A liquid component supply valve 207 is provided.

또, 연료가스 공급시스템(100)은 제1기액분리기(140) 내의 압력을 측정하는 제1압력측정기(141)와, 제1기액분리기(140) 내의 수위를 조절하는 제1수위조절기(142)와, 제2기액분리기(180) 내의 압력을 측정하는 제2압력측정기(181)와, 제2기액분리기(180) 내의 수위를 조절하는 제2수위조절기(182)를 포함한다.In addition, the fuel gas supply system 100 includes a first pressure measuring unit 141 for measuring the pressure in the first gas-liquid separator 140 and a first water level regulator 142 for adjusting the water level in the first gas-liquid separator 140. And a second pressure gauge 181 for measuring the pressure in the second gas-liquid separator 180 and a second water level controller 182 for adjusting the water level in the second gas-liquid separator 180.

이하, 연료가스 공급시스템(100)의 각 구성요소에 대해 구체적으로 설명한다.Hereinafter, each component of the fuel gas supply system 100 will be described in detail.

저장탱크(110)는 단열상태를 유지하면서 연료를 액화상태로 저장하는 멤브레인형 탱크, SPB형 탱크 등을 포함할 수 있다. 저장탱크(110)에 저장된 액화가스는 액화상태로 저장할 수 있는 LNG(Liquefied Natural Gas), LPG(Liquefied Petroleum Gas), DME(Dimethylether), 에탄(Ethane) 중 어느 하나일 수 있으나 이에 한정되는 것은 아니다. The storage tank 110 may include a membrane type tank, an SPB type tank, and the like, which store fuel in a liquefied state while maintaining an adiabatic state. Liquefied gas stored in the storage tank 110 may be any one of LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas), DME (dimethylether), ethane (Ethane) that can be stored in a liquefied state, but is not limited thereto. .

저장탱크(110) 내부압력은 저장하는 액화가스가 LNG일 경우 1bar로 유지되거나 연료공급조건을 고려해 그보다 높은 압력으로 유지될 수 있다. 저장탱크(110) 내부온도는 LNG의 액화상태 유지를 위해 ―163℃도 정도로 유지될 수 있다. 저장탱크(110)에 저장된 액화가스의 증발가스는 증발가스공급라인(L1)에 의해 제1열교환부(130) 및 압축부(120)를 거쳐 제1수요처(E1)의 연료로 공급된다. 제1수요처(E1)는 예컨대 ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압가스 분사엔진일 수 있다.The internal pressure of the storage tank 110 may be maintained at 1 bar when the liquefied gas to be stored in LNG may be maintained at a higher pressure in consideration of fuel supply conditions. The internal temperature of the storage tank 110 may be maintained at about −163 ° C. to maintain a liquefied state of LNG. The boil-off gas of the liquefied gas stored in the storage tank 110 is supplied to the fuel of the first demand E1 by the boil-off gas supply line L1 via the first heat exchange unit 130 and the compression unit 120. The first demand E1 may be, for example, a high pressure gas injection engine such as a ME-GI engine (Gas Injection engine of Man B & W).

압축부(120)는 교대로 배치된 복수의 압축기(121)와 냉각기(122)를 포함하도록 구성될 수 있으며, 저장탱크(110)로부터 공급된 액화가스의 증발가스를 제1수요처(E1)의 연료가스 공급조건에 맞게 압축시킨다. 제1수요처(E1)에서 필요로 하는 연료소모량보다 많은 압축된 증발가스가 공급된 경우, 잉여분의 압축된 증발가스는 재액화라인(L2)으로 흘러 들어간다. 재액화라인(L2)은 예컨대 150barA 정도로 압축이 이루어진 압축부(120)의 설정지점으로부터 분기되어, 제1열교환부(130), 제1감압밸브(201) 및 제1기액분리기(140)를 연결할 수 있다.The compression unit 120 may be configured to include a plurality of compressors 121 and coolers 122 alternately arranged, the evaporation gas of the liquefied gas supplied from the storage tank 110 of the first demand (E1) Compress according to fuel gas supply conditions. When the compressed boil-off gas is supplied more than the fuel consumption required by the first demand E1, the excess compressed boil-off gas flows into the reliquefaction line L2. Reliquefaction line (L2) is for example branched from the set point of the compression unit 120 is compressed to about 150barA, connecting the first heat exchange unit 130, the first pressure reducing valve 201 and the first gas-liquid separator 140 Can be.

제1열교환부(130)는 재액화라인(L2)을 통해 공급받은 압축된 증발가스와 저장탱크(110)로부터 공급된 증발가스와 열교환을 수행한다. 제1열교환부(130)로 유입되는 압축된 증발가스의 양은 재액화라인(L2)의 제1열교환부(130) 전단에 마련된 메인가스조절밸브(204)에 의해 조절될 수 있다.The first heat exchanger 130 performs heat exchange with the compressed boil-off gas supplied through the reliquefaction line L2 and the boil-off gas supplied from the storage tank 110. The amount of compressed boil-off gas flowing into the first heat exchanger 130 may be controlled by the main gas control valve 204 provided at the front end of the first heat exchanger 130 of the reliquefaction line L2.

제1열교환부(130)를 통과한 압축된 증발가스는 제1감압밸브(201)에 의해 감압된 후, 제1기액분리기(140)로 공급된다. 이때, 제1열교환부(130)를 통과한 압축된 증발가스에는 분기라인(L4)을 통해 제2열교환부(150)로 유입되어 프레시가스와 열교환이 이루어진 압축된 증발가스가 합류되어 혼합될 수 있다. 해당 혼합물은 제1감압밸브(201)에 의해 감압된 후, 제1기액분리기(140)로 공급된다. The compressed boil-off gas passing through the first heat exchange part 130 is reduced in pressure by the first pressure reducing valve 201 and then supplied to the first gas-liquid separator 140. At this time, the compressed boil-off gas passing through the first heat exchange part 130 may be introduced into the second heat-exchange part 150 through the branch line L4, and the compressed boil-off gas having heat exchanged with the fresh gas may be combined and mixed. have. The mixture is depressurized by the first pressure reducing valve 201 and then supplied to the first gas-liquid separator 140.

제1기액분리기(140)는 제1감압밸브(201)에 의해 감압된 압축된 증발가스를 기액 분리하며, 제1기액분리기(140) 내부에서는 프레시가스가 발생된다.The first gas-liquid separator 140 separates the vaporized compressed boil-off gas by the first pressure reducing valve 201 into gas-liquid, and the fresh gas is generated inside the first gas-liquid separator 140.

제2열교환부(150)는 프레시가스공급라인(L3)을 통해 제1기액분리기(140)로부터 프레시가스를 공급받아 재액화라인(L2)의 제1열교환부(130) 전단으로부터 분기된 분기라인(L4)을 통해 공급된 압축된 증발가스와 열교환을 수행하여 제2수요처(E2)로 공급한다.The second heat exchange part 150 receives the fresh gas from the first gas-liquid separator 140 through the fresh gas supply line L3, and branches from the front end of the first heat exchange part 130 of the reliquefaction line L2. Heat exchange with the compressed boil-off gas supplied through (L4) is supplied to the second demand (E2).

저장탱크(110)로부터 공급되는 증발가스는 메탄과 질소를 포함하고, 선박을 운항함에 따라 증발가스 내의 질소농도가 점차 감소할 수 있다. 이에 따라 제1기액분리기(140)에서 발생하는 프레시가스의 양도 줄어들게 된다. 이 경우, 해당 프레시가스를 종래와 같이 제1열교환부(130)로 공급할 경우, 재액화 효율이 떨어질 수 있다. The boil-off gas supplied from the storage tank 110 includes methane and nitrogen, and the nitrogen concentration in the boil-off gas may gradually decrease as the ship operates. Accordingly, the amount of fresh gas generated in the first gas-liquid separator 140 is also reduced. In this case, when the fresh gas is supplied to the first heat exchanger 130 as in the related art, the reliquefaction efficiency may be reduced.

이에 본 발명의 실시 예에서는 상술한 제2열교환부(150)를 마련하여, 제1기액분리기(140)에서 발생하는 프레시가스를 제2열교환부(150)로 공급하여 분기라인(L4)을 통해 제2열교환부(150)로 유입되는 압축된 증발가스와 열교환을 수행하도록 한다. 이를 통해 제1기액분리기(140)에서 발생하는 프레시가스의 양에 상관없이 제1열교환부(130)는 최적의 열교환 성능으로 운용될 수 있고, 제2열교환부(150)의 냉각효과 또한 높일 수 있다.Accordingly, in the embodiment of the present invention, the second heat exchanger 150 is provided, and the fresh gas generated in the first gas-liquid separator 140 is supplied to the second heat exchanger 150 through the branch line L4. Heat exchange with the compressed boil-off gas flowing into the second heat exchange unit 150 is performed. Through this, regardless of the amount of fresh gas generated in the first gas-liquid separator 140, the first heat exchanger 130 may be operated at an optimal heat exchange performance, and the cooling effect of the second heat exchanger 150 may also be enhanced. have.

또, 분기라인(L4)에 마련된 분기가스조절밸브(205)는 제2열교환부(150)를 거쳐 제2수요처(E2)로 공급되는 제1기액분리기(140)에 의해 분리된 프레시가스의 양에 따라 제2열교환부(150)로 유입되는 압축된 증발가스의 양을 조절하여, 제2열교환부(150)를 통과한 프레시가스와 제2열교환부(150)로 유입되는 압축된 증발가스 간의 온도차 또는 제2열교환부(150)로 유입되는 프레시가스와 제2열교환부(150)를 통과한 압축된 증발가스 간의 온도차가 설정범위 내로 유지되도록 할 수 있다. In addition, the branch gas control valve 205 provided in the branch line L4 is the amount of fresh gas separated by the first gas-liquid separator 140 supplied to the second demand E2 via the second heat exchange unit 150. By adjusting the amount of compressed boil-off gas flowing into the second heat exchange unit 150 according to, between the fresh gas passed through the second heat exchange unit 150 and the compressed boil-off gas introduced into the second heat exchange unit 150 The temperature difference or the temperature difference between the fresh gas flowing into the second heat exchange part 150 and the compressed boil-off gas passing through the second heat exchange part 150 may be maintained within a set range.

즉 도 1을 참조하면, 제2열교환부(150)를 통과한 프레시가스의 온도 및 제2열교환부(150)로 유입되는 압축된 증발가스의 온도를 각각 측정하도록, 프레시가스공급라인(L3)의 제2열교환부(150) 후단 및 분기라인(L4)의 제2열교환부(150) 전단에 제1온도센서(T1)와 제2온도센서(T2)가 마련될 수 있다.That is, referring to FIG. 1, the fresh gas supply line L3 measures the temperature of the fresh gas passing through the second heat exchange part 150 and the temperature of the compressed boil-off gas flowing into the second heat exchange part 150, respectively. The first temperature sensor T1 and the second temperature sensor T2 may be provided at the rear end of the second heat exchanger 150 and the front end of the second heat exchanger 150 of the branch line L4.

이때 분기가스조절밸브(205)는 제1온도센서(T1)와 제2온도센서(T2)에 의해 각각 측정된 제2열교환부(150)를 통과한 프레시가스의 온도 및 제2열교환부(150)로 유입되는 압축된 증발가스의 온도 간의 차이가 설정범위 내로 유지되도록 분기라인(L4)을 통해 제2열교환부(150)로 유입되는 압축된 증발가스의 양을 조절할 수 있다.At this time, the branch gas control valve 205 is the temperature of the fresh gas passed through the second heat exchange unit 150 respectively measured by the first temperature sensor T1 and the second temperature sensor T2 and the second heat exchange unit 150. The amount of the compressed boil-off gas introduced into the second heat exchange part 150 may be adjusted through the branch line L4 so that the difference between the temperatures of the compressed boil-off gas introduced into the N is maintained within the set range.

또 다른 예에서 도 2를 참조하면, 제2열교환부(150)로 유입되는 프레시가스의 온도 및 제2열교환부(150)를 통과한 압축된 증발가스의 온도를 각각 측정하도록, 프레시가스공급라인(L3)의 제2열교환부(150) 전단 및 분기라인(L4)의 제2열교환부(150) 후단에 제1온도센서(T1)와 제2온도센서(T2)가 마련될 수 있다.In another example, referring to FIG. 2, the fresh gas supply line measures the temperature of the fresh gas flowing into the second heat exchange part 150 and the temperature of the compressed boil-off gas passing through the second heat exchange part 150, respectively. A first temperature sensor T1 and a second temperature sensor T2 may be provided before the second heat exchanger 150 of L3 and after the second heat exchanger 150 of the branch line L4.

이때 분기가스조절밸브(205)는 제1온도센서(T1)와 제2온도센서(T2)에 의해 각각 측정된 제2열교환부(150)오 유입되는 프레시가스의 온도 및 제2열교환부(150)를 통과한 압축된 증발가스의 온도 간의 차이가 설정범위 내로 유지되도록 분기라인(L4)을 통해 제2열교환부(150)로 유입되는 압축된 증발가스의 양을 조절할 수 있다.At this time, the branch gas control valve 205 is the temperature of the fresh gas introduced into the second heat exchanger 150 measured by the first temperature sensor T1 and the second temperature sensor T2 and the second heat exchanger 150, respectively. The amount of compressed boil-off gas flowing into the second heat exchange unit 150 through the branch line (L4) can be adjusted so that the difference between the temperatures of the compressed boil-off gas passed through) is maintained within the set range.

이와 같이, 제1열교환부(130)와 제2열교환부(150)를 각각 마련하고, 분기가스조절밸브(205)에 의해 상술한 온도차가 설정범위 내로 유지되도록 함으로써, 재액화 효율을 향상시킬 수 있다.Thus, by providing the first heat exchanger 130 and the second heat exchanger 150, respectively, by the branch gas control valve 205 to maintain the above-described temperature difference within the set range, it is possible to improve the re-liquefaction efficiency. have.

도 1을 참조하면, 압력측정기(160)는 압축가스공급라인(L5)에 마련되어, 제2수요처(E2)의 연료소모량에 따른 압력을 측정한다. 제2수요처(E2)의 연료소모량이 공급되는 연료에 비해 많을 경우, 낮은 압력이 측정된다. 반면, 제2수요처(E2)의 연료소모량이 공급되는 연료에 비해 적을 경우, 높은 압력이 측정된다.Referring to FIG. 1, the pressure measurer 160 is provided in the compressed gas supply line L5 to measure the pressure according to the fuel consumption amount of the second demand E2. When the fuel consumption of the second demand E2 is larger than that of the supplied fuel, a low pressure is measured. On the other hand, when the fuel consumption of the second demand E2 is smaller than the fuel supplied, a high pressure is measured.

상술한 바와 같이 선박을 운항함에 따라 변화되는 저장탱크(110) 내의 증발가스의 질소농도 및 선박 운용방법과 저장탱크 내부의 압력 변화 등에 따라 변화하는 증발가스의 온도에 의해, 제1기액분리기(140)에서 발생하는 프레시가스의 양이 변화될 수 있다. 따라서, 제2수요처(E2)로 안정적으로 연료가 공급될 수 없는 문제점이 있다.As described above, the first gas-liquid separator 140 is controlled by the nitrogen concentration of the boil-off gas in the storage tank 110 and the temperature of the boil-off gas which changes according to the pressure change in the storage tank and the vessel operating method. The amount of fresh gas generated from) may vary. Therefore, there is a problem in that fuel cannot be stably supplied to the second demand E2.

이러한 문제점을 해소시키기 위해, 본 발명의 실시 예에 따른 제어부(170)는 압축가스공급라인(L5)에 마련된 압축가스공급밸브(202)와 프레시가스공급라인(L3)의 제2열교환부(150) 전단에 마련된 프레시가스공급밸브(203) 중 하나 이상을 제어하여, 제2수요처(E2)의 연료소모량에 따라 항시 적정량의 연료가 공급되도록 한다.In order to solve this problem, the control unit 170 according to an embodiment of the present invention is the second heat exchange unit 150 of the compressed gas supply valve 202 and the fresh gas supply line (L3) provided in the compressed gas supply line (L5). One or more of the fresh gas supply valve 203 provided at the front end is controlled so that an appropriate amount of fuel is always supplied according to the fuel consumption amount of the second demand E2.

구체적으로, 제어부(170)는 제2수요처(E2)의 연료로 공급되는 프레시가스의 양이 제2수요처(E2)가 필요로 하는 연료소모량보다 적어 상술한 압력측정기(160)에 의해 측정된 압력이 설정값 미만인 경우, 제2수요처(E2)가 필요로 하는 연료소모량에 따라 압축가스공급밸브(202)를 개방시켜, 압축가스공급라인(L5)을 통해 설정압력으로 압축된 증발가스를 추가로 제2수요처(E2)로 공급할 수 있다. 압축가스공급라인(L5)은 예컨대, 압축부(120)의 중간지점으로부터 분기되어 제2수요처(E2)의 연료공급조건에 맞게 압축된 증발가스를 공급할 수 있다.In detail, the controller 170 measures the pressure measured by the pressure measurer 160 because the amount of the fresh gas supplied to the fuel of the second demand E2 is smaller than the amount of fuel consumption required by the second demand E2. If it is less than this set value, the compressed gas supply valve 202 is opened in accordance with the amount of fuel consumption required by the second demand E2 to further add the boil-off gas compressed to the set pressure through the compressed gas supply line L5. It can supply to the 2nd demand E2. The compressed gas supply line L5 may be, for example, branched from an intermediate point of the compression unit 120 to supply the boil-off gas compressed according to the fuel supply conditions of the second demand E2.

또, 제어부(170)는 제2수요처(E2)로 공급되는 프레시가스의 양이 제2수요처(E2)가 필요로 하는 연료소모량보다 많아 압력측정기(160)에 의해 측정된 압력이 설정값을 초과한 경우, 압축가스공급밸브(202)를 닫고 프레시가스공급밸브(203)를 조절하여 제2수요처(E2)로 공급되는 프레시가스의 양을 감소시킬 수 있다.In addition, the control unit 170, the amount of the fresh gas supplied to the second demand (E2) is larger than the fuel consumption required by the second demand (E2), the pressure measured by the pressure gauge 160 exceeds the set value. In one case, the amount of fresh gas supplied to the second demand E2 may be reduced by closing the compressed gas supply valve 202 and adjusting the fresh gas supply valve 203.

이와 같이, 프레시가스의 양이 변화하더라도 제2수요처(E2)의 연료소모량에 따라 항시 적정량의 연료가 공급될 수 있다.As such, even if the amount of fresh gas changes, an appropriate amount of fuel may be supplied at all times according to the fuel consumption amount of the second demand E2.

한편, 상술한 분기라인(L4)은 재액화라인(L2)의 제1열교환부(130) 전단으로부터 분기되어, 제2열교환부(150)를 거쳐 재액화라인(L2)의 제1열교환부(130) 후단과 연결된다. 이에 제2열교환부(150)를 거친 압축된 증발가스는 제1열교환부(130)를 거친 압축된 증발가스에 합류되며, 제1감압밸브(201)에 의해 감압된다. Meanwhile, the aforementioned branch line L4 branches from the front end of the first heat exchange part 130 of the reliquefaction line L2 and passes through the second heat exchange part 150 to the first heat exchange part of the reliquefaction line L2 ( 130) connected to the rear end. Accordingly, the compressed boil-off gas that has passed through the second heat exchange part 150 joins the compressed boil-off gas that has passed through the first heat exchange part 130 and is decompressed by the first pressure reducing valve 201.

제1기액분리기(140)는 이러한 제1감압밸브(201)를 거쳐 감압된 유체를 기액 분리시키고, 제1기액분리기(140)에서 발생한 프레시가스는 프레시가스공급밸브(203)를 거쳐 제2열교환부(150)로 공급된다. 프레시가스공급밸브(203)는 제2수요처(E2)의 연료공급조건에 맞게 프레시가스의 압력을 조절할 수 있다.The first gas-liquid separator 140 separates the pressure-reduced fluid through the first pressure reducing valve 201, and the fresh gas generated in the first gas-liquid separator 140 passes through the fresh gas supply valve 203 to the second heat exchange. It is supplied to the unit 150. The fresh gas supply valve 203 may adjust the pressure of the fresh gas according to the fuel supply condition of the second demand E2.

또, 제1기액분리기(140)에 의해 분리된 액체성분은 제2감압밸브(206)에 의해 감압된 후 제2기액분리기(180)로 공급된다. 여기서, 제1기액분리기(170) 내에서 발생한 프레시가스의 양이 너무 많아 제1압력측정기(141)에 의해 측정된 제1기액분리기(140) 내의 압력이 설정값을 초과한 경우, 제1수위조절기(142)는 액체성분공급밸브(207)를 개방시켜 제1기액분리기(140) 내의 수위가 낮아지도록 한다. 이 경우, 제1기액분리기(140)로부터 액체성분이 빠져나가면서 프레시가스도 함께 빠져나가 제1기액분리기(170) 내부의 압력 상승을 막을 수 있다.In addition, the liquid component separated by the first gas-liquid separator 140 is supplied to the second gas-liquid separator 180 after being decompressed by the second pressure reducing valve 206. Here, when the pressure in the first gas-liquid separator 140 measured by the first pressure measuring instrument 141 exceeds the set value because the amount of fresh gas generated in the first gas-liquid separator 170 is too large, the first water level The regulator 142 opens the liquid component supply valve 207 so that the water level in the first gas-liquid separator 140 is lowered. In this case, as the liquid component is discharged from the first gas-liquid separator 140, the fresh gas is also escaped together to prevent a pressure increase inside the first gas-liquid separator 170.

제2기액분리기(180)는 제2감압밸브(206)에 의해 감압된 제1기액분리기(140)로부터 공급된 유체를 기액 분리시킨다. 이때, 제2기액분리기(180)에 의해 분리된 기체성분은 합류라인(L7)을 통해 증발가스공급라인(L1)의 압축부(120) 전단으로 공급되고, 제2기액분리기(180)에 의해 분리된 액체성분은 회수라인(L8)을 통해 저장탱크(110)로 회수된다. 합류라인(L7)과 회수라인(L8)에는 각각 유량을 제어하는 제1 및 제2유량제어밸브(208,209)가 마련될 수 있다.The second gas-liquid separator 180 gas-liquids the fluid supplied from the first gas-liquid separator 140 decompressed by the second pressure reducing valve 206. At this time, the gas component separated by the second gas-liquid separator 180 is supplied to the front end of the compression unit 120 of the boil-off gas supply line (L1) through the confluence line (L7), by the second gas-liquid separator (180) The separated liquid component is recovered to the storage tank 110 through the recovery line (L8). The joining line L7 and the recovery line L8 may be provided with first and second flow rate control valves 208 and 209 for controlling the flow rate, respectively.

이상에서는 특정의 실시 예에 대하여 도시하고 설명하였다. 그러나, 본 발명은 상기한 실시 예에만 한정되지 않으며, 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 이하의 청구범위에 기재된 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경 실시할 수 있을 것이다.In the above, specific embodiments have been illustrated and described. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can variously change variously without departing from the gist of the technical idea of the invention described in the claims below. Could be.

110: 저장탱크 120: 압축부
130: 제1열교환부 140: 제1기액분리기
141: 제1압력측정기 142: 제1수위조절기
150: 제2열교환부 160: 압력측정기
170: 제어부 180: 제2기액분리기
181: 제2압력측정기 182: 제2수위조절기
201: 제1감압밸브 202: 압축가스공급밸브
203: 프레시가스공급밸브 204: 메인가스조절밸브
205: 분기가스조절밸브 206: 제2감압밸브
207: 액체성분공급밸브 208: 제1유량제어밸브
209: 제2유량제어밸브 L1: 증발가스공급라인
L2: 재액화라인 L3: 프레시가스공급라인
L4: 분기라인 L5: 압축가스공급라인
L6: 기액분리라인 L7: 합류라인
L8: 회수라인 T1: 제1온도센서
T2: 제2온도센서110: storage tank 120: compression
130: first heat exchanger 140: first gas-liquid separator
141: first pressure gauge 142: first level controller
150: second heat exchanger 160: pressure measuring instrument
170: control unit 180: second gas-liquid separator
181: second pressure gauge 182: second water level regulator
201: first pressure reducing valve 202: compressed gas supply valve
203: fresh gas supply valve 204: main gas control valve
205: branch gas control valve 206: second pressure reducing valve
207: liquid component supply valve 208: first flow control valve
209: second flow control valve L1: boil-off gas supply line
L2: Reliquefaction Line L3: Fresh Gas Supply Line
L4: Branch Line L5: Compressed Gas Supply Line
L6: gas-liquid separation line L7: confluence line
L8: Recovery Line T1: First Temperature Sensor
T2: second temperature sensor

Claims (3)

저장탱크로부터 공급받은 액화가스의 증발가스를 압축시켜 증발가스공급라인을 통해 제1수요처로 공급하는 압축부;
상기 압축된 증발가스 중 일부를 재액화라인을 통해 공급받아 상기 저장탱크로부터 공급된 증발가스와 열교환을 수행하는 제1열교환부;
상기 제1열교환부를 통과한 후 제1감압밸브에 의해 감압된 상기 압축된 증발가스를 기액 분리시킨 제1기액분리기로부터 프레시가스공급라인을 통해 프레시가스를 공급받아, 상기 재액화라인의 상기 제1열교환부 전단으로부터 분기된 분기라인을 통해 공급된 상기 압축된 증발가스와 열교환을 수행하여 제2수요처로 공급하는 제2열교환부;
상기 제2열교환부를 통과한 상기 프레시가스의 온도 및 상기 제2열교환부로 유입되는 상기 압축된 증발가스의 온도 또는 상기 제2열교환부로 유입되는 상기 프레시가스의 온도 및 상기 제2열교환부를 통과한 상기 압축된 증발가스의 온도를 각각 측정하는 제1온도센서와 제2온도센서; 및
상기 제1온도센서와 제2온도센서에 의해 측정된 온도의 차가 설정범위 내로 유지되도록 상기 분기라인을 통해 공급되는 상기 압축된 증발가스의 양을 조절하는 분기가스조절밸브;를 포함하는 연료가스 공급시스템.A compression unit compressing the boil-off gas of the liquefied gas supplied from the storage tank and supplying the boil-off gas to the first demand through the boil-off gas supply line;
A first heat exchanger configured to receive a portion of the compressed boil-off gas through a reliquefaction line and perform heat exchange with the boil-off gas supplied from the storage tank;
Fresh gas is supplied through the fresh gas supply line from the first gas-liquid separator in which the compressed boil-off gas decompressed by the first pressure reducing valve and gas-liquid separated after passing through the first heat exchanger, A second heat exchanger configured to perform heat exchange with the compressed boil-off gas supplied through a branch line branched from the front end of the heat exchanger to supply to a second demand;
The temperature of the fresh gas passing through the second heat exchange part and the temperature of the compressed boil-off gas flowing into the second heat exchange part or the temperature of the fresh gas flowing into the second heat exchange part and the compression passing through the second heat exchange part A first temperature sensor and a second temperature sensor respectively measuring the temperature of the evaporated gas; And
Fuel gas supply comprising a branch gas control valve for controlling the amount of the compressed boil-off gas supplied through the branch line so that the difference between the temperature measured by the first temperature sensor and the second temperature sensor is maintained within the set range system. 제1항에 있어서,
상기 재액화라인은 상기 압축부, 제1열교환부, 제1감압밸브 및 상기 제1기액분리기를 연결하고,
상기 분기라인은 상기 재액화라인의 상기 제1열교환부 전단으로부터 분기되어 상기 제2열교환부 및 상기 재액화라인의 상기 제1열교환부 후단과 연결되며,
상기 프레시가스공급라인은 상기 제1기액분리기, 제1열교환부 및 제2수요처를 연결하고,
상기 제1온도센서와 제2온도센서는 각각 상기 프레시가스공급라인의 상기 제2열교환부 후단 및 상기 분기라인의 상기 제2열교환부 전단에 마련되거나, 상기 프레시가스공급라인의 상기 제2열교환부 전단 및 상기 분기라인의 상기 제2열교환부 후단에 마련된 연료가스 공급시스템.The method of claim 1,
The reliquefaction line connects the compression unit, the first heat exchange unit, the first pressure reducing valve and the first gas-liquid separator,
The branch line is branched from the front end of the first heat exchange part of the reliquefaction line and connected to the second heat exchange part and a rear end of the first heat exchange part of the reliquefaction line,
The fresh gas supply line connects the first gas-liquid separator, the first heat exchanger, and the second customer,
The first temperature sensor and the second temperature sensor are respectively provided after the second heat exchange part of the fresh gas supply line and the front end of the second heat exchange part of the branch line, or the second heat exchange part of the fresh gas supply line. A fuel gas supply system provided at a front end and a rear end of the second heat exchange part of the branch line. 제1항에 있어서,
상기 제1기액분리기로부터 분리된 액체성분을 공급받아 설정된 압력으로 감압시키는 제2감압밸브와,
상기 감압된 액체성분을 기액 분리시키는 제2기액분리기를 더 포함하되,
상기 제2기액분리기에 의해 분리된 프레시가스는 상기 증발가스공급라인의 상기 압축부 전단으로 공급되고,
상기 제2기액분리기에 의해 분리된 액체성분은 상기 저장탱크로 회수되는 연료가스 공급시스템.The method of claim 1,
A second pressure reducing valve configured to receive a liquid component separated from the first gas liquid separator and to reduce the pressure to a predetermined pressure;
Further comprising a second gas-liquid separator for gas-liquid separation of the reduced pressure liquid component,
The fresh gas separated by the second gas-liquid separator is supplied to the front end of the compression section of the boil-off gas supply line,
And a liquid component separated by the second gas-liquid separator is recovered to the storage tank.
KR1020180073574A 2018-06-26 2018-06-26 Fuel gas supply system KR102040005B1 (en)

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