WO2023075241A1 - Lng fuel supply system for small ship, having submerged pump and integrated heat exchanger - Google Patents

Lng fuel supply system for small ship, having submerged pump and integrated heat exchanger Download PDF

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Publication number
WO2023075241A1
WO2023075241A1 PCT/KR2022/015649 KR2022015649W WO2023075241A1 WO 2023075241 A1 WO2023075241 A1 WO 2023075241A1 KR 2022015649 W KR2022015649 W KR 2022015649W WO 2023075241 A1 WO2023075241 A1 WO 2023075241A1
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Prior art keywords
pressure
lng
fuel
lng fuel
fuel tank
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PCT/KR2022/015649
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French (fr)
Korean (ko)
Inventor
이윤혁
이완태
김건웅
공태우
김창수
구병수
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주식회사 동화엔텍
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Publication of WO2023075241A1 publication Critical patent/WO2023075241A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • 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
    • 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
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • 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
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • 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
    • F17C2227/0135—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
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • 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
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • 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

Definitions

  • the present invention relates to a space-intensive LNG fuel supply system for a small vessel, which is optimized for a small vessel, especially among LNG fuel-propelled vessels, and can conserve the space occupied by the fuel supply system.
  • LNG is supplied to the engine as gaseous natural gas after meeting a certain temperature and pressure required by the engine through a pump and heat exchanger to supply LNG as fuel.
  • FGSS LNG fuel supply system
  • a submerged pump which is an LNG FEED PUMP, is installed inside the LNG fuel tank to meet a certain pressure of natural gas to be supplied as fuel, and a pump pressurization method that supplies the necessary pressure to the engine , a method of increasing the LNG inside the tank to the pressure required by the engine without a pump and then supplying it to the engine through a heat exchanger is used.
  • the present invention has been made to solve the above problems, LNG fuel for a small ship equipped with a submersible pump and an integrated heat exchanger that can stably supply fuel to the engine and maximize space utilization of the ship through an integrated heat exchanger Its purpose is to provide a supply system.
  • an LNG fuel supply system for a small ship having a submersible pump and an integrated heat exchanger includes an LNG fuel tank for accommodating liquid fuel and gaseous fuel and having a submersible pump in the liquid fuel;
  • An integrated heat exchanger having a first internal passage, a second internal passage adjacent to the first internal passage, and a third internal passage disposed opposite to the first and second internal passages to sequentially exchange heat with each other;
  • a fuel supply line for receiving the liquid fuel in the LNG fuel tank at a constant pressure from the submersible pump, guiding it to the first internal passage, vaporizing the liquid fuel at a temperature required by the engine, and supplying the liquid fuel to the engine;
  • a pressure generating line with a control valve a glycol water supply line receiving a heat source from a glycol water heater heated by the jacket water of the engine and supplying the heat to the third internal passage; and a branch line branched from the pressure generating line through which the liquid fuel passes and connected to the fuel supply line through which the liquid fuel passes, in which a second pressure control valve for maintaining a constant pressure of the LNG fuel tank is installed. It is characterized by doing.
  • the LNG fuel tank is provided with a pressure sensor for detecting internal pressure, and the first and third pressure control valves are controlled by the pressure sensor. .
  • Optimized for the fuel supply system of small LNG-powered ships it can satisfy both stable fuel supply, operational convenience, and space intensiveness.
  • the manufacturing cost is also reduced. has a reducing effect.
  • FIG. 1 is a schematic configuration diagram of an LNG fuel supply system for a small vessel having a submersible pump and an integrated heat exchanger according to the present invention.
  • FIG. 1 is a schematic configuration diagram of an LNG fuel supply system for a small vessel having a submersible pump and an integrated heat exchanger according to the present invention.
  • the present invention largely consists of an LNG fuel tank 100, an integrated heat exchanger 200, a fuel supply line 300, a pressure generation line 400, a glycol water supply line 500, and a branch line. (600).
  • the LNG fuel tank 100 includes boil-off gas in the upper evaporation space (hereinafter referred to as 'gaseous fuel') and LNG stored in the lower portion (hereinafter referred to as 'liquid fuel'), and the liquid fuel includes an engine
  • 'gaseous fuel' boil-off gas in the upper evaporation space
  • 'liquid fuel' LNG stored in the lower portion
  • the liquid fuel includes an engine
  • a submerged pump is provided to supply liquid fuel at a certain pressure.
  • the integrated heat exchanger 200 receives liquid fuel and vaporizes it into gaseous fuel at a temperature required by the engine or heats it with free gas at a constant temperature.
  • a second internal passage 30 adjacent to the internal passage and a third internal passage 40 disposed opposite to the first and second internal passages to sequentially exchange heat with each other are formed in the form of a single heat exchanger.
  • first and second internal passages 20 and 30 are arranged consecutively in the third internal passage 40 so as to sequentially exchange heat.
  • the fuel supply line 300 is a line that guides the liquid fuel stored in the lower portion of the LNG fuel tank 100 to be supplied to the engine 25.
  • the fuel supply line 300 receives the liquid fuel in the LNG fuel tank 100 at a constant pressure from the submersible pump 10 and flows through the first internal flow path 20 along the line 1. , and the liquid fuel passing through the first internal passage 20 is heat-exchanged with glycol water passing through the third internal passage 40 to be described later, vaporized into gaseous fuel at a temperature required by the engine, and then the gas It is a configuration for supplying fuel to the final engine 25 along the line 2.
  • the pressure generating line 400 heats the liquid fuel stored in the lower portion of the LNG fuel tank 100 to a certain temperature, and more specifically, pre-gas in a low-temperature gas state of about minus 130 to 50 ° C. This is a line guiding the supply to the upper portion of the LNG fuel tank 100.
  • the pressure generating line 400 receives the liquid fuel in the LNG fuel tank 100 at a pressure according to the liquid level and guides it to the second internal flow passage 30 along the line 4,
  • the liquid fuel passing through the second internal passage 30 is heat-exchanged with glycol water passing through the third internal passage 40 to be described later to become free gas heated to a certain temperature, and then the free gas is finally passed along line 5. It is configured to be supplied to the upper portion of the LNG fuel tank 100.
  • a first pressure control valve 50 for maintaining the pressure of the LNG fuel tank 100 constant is installed in the pressure generating line 400, and at this time, the first pressure control valve 50 is 2 It is preferable to be located between the internal flow path 30 and the LNG fuel tank 100.
  • the glycol water supply line 500 receives a heat source from the glycol water heater 45 heated by the jacket water 35 (Jacket Water) of the engine 25, and along the line 8 the third internal flow path ( 40) to guide the supply of heated glycol water.
  • the glycol water that has passed through the third internal flow path 40 is accommodated in the glycol water tank 55 along line 9 again, which is supplied to the glycol water heater 45 again through the glycol water pump 65 Of course, it can be formed into a circulation structure.
  • the branch line 600 is a line for supplying the liquid fuel of the LNG fuel tank 100 to the engine even when the submersible pump 10 fails, and for this purpose, the pressure generating line through which the liquid fuel passes It is branched from 400 and connected to the fuel supply line 300 through which liquid fuel passes.
  • the liquid fuel supplied from the LNG fuel tank 100 by the branch line 600 is branched from the line 4 and connected to the line 1, and the branch line 600 has the LNG fuel tank ( 100) a second pressure control valve 60 for maintaining a constant pressure is installed.
  • the liquid fuel is smoothly supplied at an appropriate pressure, and the liquid fuel supplied in this way is glycol water passing through the third internal passage 40 while passing through the first internal passage 20 as described above After heat exchange, the process of being vaporized into gaseous fuel at the temperature required by the engine and supplied to the final engine 25 is the same.
  • the free gas is supplied to the upper portion of the LNG fuel tank 100 by the pressure generating line 400 and pressurizes the inside of the LNG fuel tank 100, resulting in lower
  • a portion of the liquid fuel can be supplied continuously through the branch line 600 through the pressure generating line 400 smoothly, and the remaining liquid fuel becomes free gas through the integrated heat exchanger 200 and is again LNG. It is introduced into the upper part of the fuel tank 100.
  • a bypass line 700 may be further included between the pressure generating line 400 and the fuel supply line 300 .
  • the bypass line 700 is branched from the pressure generating line 400 through which the free gas passes, more specifically, line 5, and is connected to the fuel supply line 300 through which liquid fuel passes, more specifically, line 1.
  • a third pressure control valve 70 is installed in the bypass line 700 to keep the pressure of the LNG fuel tank 100 constant.
  • the LNG fuel tank 100 may further include a pressure sensor 80 for detecting an internal pressure.
  • the LNG fuel tank ( 100) it is possible to keep the internal pressure constant.
  • the pressure sensor 80 receives the value and immediately controls the first pressure control valve 50 to generate the pressure.
  • the amount of free gas supplied through the line 400 increases, and as a result, the internal pressure of the LNG fuel tank 100 rises.
  • the pressure sensor 80 receives the value and immediately controls the third pressure control valve 70, A portion is bypassed along the bypass line 700 and supplied to the fuel supply line 300 to be supplied to the final engine 25 through the integrated heat exchanger 200, and as a result, LNG fuel The internal pressure of the tank 100 decreases.
  • liquid fuel of the LNG fuel tank 100 is continuously supplied through the pressure generating line 400, a part of the liquid fuel is continuously supplied through the branch line 600, and the remaining liquid fuel is supplied through the integrated heat exchanger 200.
  • the free gas is introduced into the upper part of the LNG fuel tank 100 again to pressurize the liquid fuel inside the LNG fuel tank 100, and at this time, the first pressure control valve 50 installed in the pressure generating line 400 is the LNG It is interlocked and controlled by the internal pressure of the fuel tank 100.
  • the first to third pressure control valves are respectively controlled in conjunction with the internal pressure of the LNG fuel tank 100, sophisticated flow and pressure control is possible during fuel supply, and as a result, stable Convenience of fuel supply and operation can be promoted.
  • a submersible pump is used even for a small vessel, which facilitates pressure estimation according to engine load, enabling stable fuel supply to the engine. This makes it possible to maintain a continuous fuel supply.
  • a pressure sensor 90 is installed in the fuel supply line 300 to which liquid is supplied, and the submersible pump 10 is controlled by a controller 95 such as a separate variable main plate drive (VFD).
  • VFD variable main plate drive
  • the controller 95 receives a signal from the pressure sensor 90 so that the operation of the submersible pump 10 can be appropriately controlled, and as a result, the amount of liquid fuel supplied can also be appropriately varied.
  • the present invention it is possible to immediately switch to the 'pressurized mode' even when the submersible pump fails, and furthermore, it is necessary to switch between the 'pump mode' and the 'pressurized mode' according to various ship operating conditions. It can be switched and used according to the engine, so it is possible to promote stable fuel supply to the engine and convenience of operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The present invention relates to an LNG fuel supply system for a small ship, having a submerged pump and an integrated heat exchanger, and, to a space-intensive LNG fuel supply system for a small ship, the system being optimized especially for a small ship from among LNG fuel-propelled ships so as to be intensive with respect to space occupied by the fuel supply system.

Description

잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템LNG fuel supply system for small vessels equipped with submersible pump and integrated heat exchanger
본 발명은 LNG 연료 추진 선박 중에서도, 특히 소형 선박에 최적화되어 연료 공급 시스템이 차지하는 공간을 집약할 수 있는 소형 선박용 공간집약적 LNG 연료공급시스템에 관한 것이다.The present invention relates to a space-intensive LNG fuel supply system for a small vessel, which is optimized for a small vessel, especially among LNG fuel-propelled vessels, and can conserve the space occupied by the fuel supply system.
소형 선박의 LNG 연료공급시스템(FGSS)의 경우 LNG를 연료로 공급하기 위해 펌프 및 열교환기를 거쳐 엔진에서 요구하는 일정 온도 및 압력을 충족시킨 후 기체상태의 천연가스로 엔진에 공급된다. In the case of a small ship's LNG fuel supply system (FGSS), LNG is supplied to the engine as gaseous natural gas after meeting a certain temperature and pressure required by the engine through a pump and heat exchanger to supply LNG as fuel.
이와 같은, 소형 선박의 경우 연료로 공급될 천연가스의 일정 압력을 충족시키기 위해 LNG 연료탱크 내부에 LNG FEED PUMP인 잠수식 펌프(Submerged Pump)를 설치하여 엔진에 필요한 압력을 공급하는 펌프 가압 방식과, 펌프 없이 탱크 내부의 LNG를 엔진이 요구하는 압력으로 증가시킨 후 열교환기를 거쳐 엔진에 공급하는 방식이 사용되고 있다.In the case of such a small ship, a submerged pump, which is an LNG FEED PUMP, is installed inside the LNG fuel tank to meet a certain pressure of natural gas to be supplied as fuel, and a pump pressurization method that supplies the necessary pressure to the engine , a method of increasing the LNG inside the tank to the pressure required by the engine without a pump and then supplying it to the engine through a heat exchanger is used.
그러나, 소형 선박의 경우 경제성과 운용의 편리성을 목적으로 비펌프식으로 구성하고 있으나, 비펌프식의 경우 펌프 가압 방식을 사용할 경우 엔진 부하(load)에 따른 압력추정을 원활하게 하여 엔진에 안정적인 연료공급이 가능한 이점을 얻을 수가 없으며, 또한 가열용 열교환기가 차지하는 공간을 상대적으로 크게 확보하여야 하므로, 그 결과 화물적재 공간 확보가 용이하지 않게 될 뿐아니라, 배관 등 기자재 수량도 늘게되어 전체적으로 제작비용이 대폭 증가하게 된다.However, in the case of a small ship, it is composed of a non-pump type for the purpose of economic feasibility and convenience of operation. The advantage of fuel supply cannot be obtained, and the space occupied by the heat exchanger for heating must be secured relatively large. will increase drastically.
이에, 소형 선박에 있어서 펌프식으로 구성하더라도 엔진 부하에 따른 압력추정을 원활하게 하여 엔진에 안정적인 연료공급이 가능하면서 보다 정교한 유량 및 압력제어가 가능하고, 나아가 운항도중 발생할 수 있는 펌프 고장시에도 안정적인 연료공급이 가능하도록 하는 기술 개발이 필요한 실정이다.Therefore, even if it is configured as a pump type in a small ship, it is possible to smoothly estimate the pressure according to the load of the engine, so that stable fuel supply to the engine is possible, and more sophisticated control of flow rate and pressure is possible. There is a need to develop technologies that enable fuel supply.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, 엔진에 안정적으로 연료공급이 가능하면서 통합형 열교환기를 통하여 선박의 공간활용도를 극대화시킬 수 있는 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템을 제공하는데 그 목적 있다.The present invention has been made to solve the above problems, LNG fuel for a small ship equipped with a submersible pump and an integrated heat exchanger that can stably supply fuel to the engine and maximize space utilization of the ship through an integrated heat exchanger Its purpose is to provide a supply system.
이와 함께, 항해 중 펌프 고장시에도 통합형 열교환기를 통해 LNG 연료탱크를 가압하는 시스템으로 신속히 전환하여 안정적인 연료공급이 가능하도록 하는 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템을 제공하는데도 그 목적 있다.In addition, it provides an LNG fuel supply system for small ships equipped with a submersible pump and an integrated heat exchanger that enables stable fuel supply by quickly switching to a system that pressurizes the LNG fuel tank through an integrated heat exchanger even in the event of a pump failure during voyage. there is a purpose
이와 함께 본 발명의 기타 목적 및 장점들은 하기에 설명될 것이며, 이는 본 발명의 청구범위에 기재된 사항 및 그 실시예의 개시 내용뿐만 아니라, 이들로부터 용이하게 추고할 수 있는 범위 내의 수단 및 조합에 의해 더욱 넓은 범위로 포섭될 것임을 첨언한다.Along with this, other objects and advantages of the present invention will be described below, which will be further explained by means and combinations within the scope easily deduced from them, as well as the details described in the claims of the present invention and the disclosure of the embodiments thereof. It is added that it will be embraced in a wide range.
상기 목적을 달성하기 위해 본 발명에 따른 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템은, 액체연료 및 기체연료를 수용하고, 상기 액체연료 내에 잠수식 펌프가 구비되는 LNG 연료탱크; 제1 내부유로, 상기 제1 내부유로와 인접하는 제2 내부유로 및 상기 제1, 2 내부유로와 대향되게 배치되어 상호 순차적으로 열교환하는 제3 내부유로가 형성되는 통합형 열교환기; 상기 LNG 연료탱크의 액체연료를 상기 잠수식 펌프로부터 일정 압력으로 공급받아 상기 제1 내부유로로 안내하여 엔진이 요구하는 온도의 기체연료로 기화시켜 엔진으로 공급하는 연료공급라인; 상기 LNG 연료탱크의 액체연료를 공급받아 상기 제2 내부유로로 안내하여 일정 온도로 가열시켜 프리가스로 상기 LNG 연료탱크 상부로 공급하고, 상기 LNG 연료탱크의 압력을 일정하게 유지시키기 위한 제1 압력제어밸브가 설치된 압력생성라인; 상기 엔진의 자켓워터에 의해 가열되는 글리콜워터 히터로부터 열원을 공급받아 상기 제3 내부유로로 공급하는 글리콜워터 공급라인; 및 액체연료가 통과하는 상기 압력생성라인으로부터 분기되어 액체연료가 통과하는 상기 연료공급라인과 연결되고, 상기 LNG 연료탱크의 압력을 일정하게 유지시키기 위한 제2 압력제어밸브가 설치되는 분기라인을 포함하는 것을 특징으로 한다.In order to achieve the above object, an LNG fuel supply system for a small ship having a submersible pump and an integrated heat exchanger according to the present invention includes an LNG fuel tank for accommodating liquid fuel and gaseous fuel and having a submersible pump in the liquid fuel; An integrated heat exchanger having a first internal passage, a second internal passage adjacent to the first internal passage, and a third internal passage disposed opposite to the first and second internal passages to sequentially exchange heat with each other; a fuel supply line for receiving the liquid fuel in the LNG fuel tank at a constant pressure from the submersible pump, guiding it to the first internal passage, vaporizing the liquid fuel at a temperature required by the engine, and supplying the liquid fuel to the engine; A first pressure for receiving liquid fuel from the LNG fuel tank, guiding it to the second internal passage, heating it to a certain temperature, supplying free gas to the upper portion of the LNG fuel tank, and maintaining a constant pressure in the LNG fuel tank. a pressure generating line with a control valve; a glycol water supply line receiving a heat source from a glycol water heater heated by the jacket water of the engine and supplying the heat to the third internal passage; and a branch line branched from the pressure generating line through which the liquid fuel passes and connected to the fuel supply line through which the liquid fuel passes, in which a second pressure control valve for maintaining a constant pressure of the LNG fuel tank is installed. It is characterized by doing.
그리고 본 발명의 바람직한 실시예에 따르면, 상기 프리가스가 통과하는 압력생성라인으로부터 분기되어 액체연료가 통과하는 상기 연료공급라인과 연결되고, 상기 LNG 연료탱크의 압력을 일정하게 유지시키기 위한 제3 압력제어밸브가 설치되는 바이패스라인을 포함하는 것을 특징으로 한다.And according to a preferred embodiment of the present invention, the third pressure branched from the pressure generating line through which the free gas passes, connected to the fuel supply line through which liquid fuel passes, and maintaining the pressure of the LNG fuel tank constant. It is characterized in that it includes a bypass line in which the control valve is installed.
이와 함께 본 발명의 바람직한 실시예에 따르면, 상기 LNG 연료탱크에는 내부 압력을 감지하는 압력감지센서가 구비되고, 상기 제1 및 제3 압력제어밸브는 상기 압력감지센서에 의해 제어되는 것을 특징으로 한다.In addition, according to a preferred embodiment of the present invention, the LNG fuel tank is provided with a pressure sensor for detecting internal pressure, and the first and third pressure control valves are controlled by the pressure sensor. .
상술된 바와 같이 본 발명에 따르면 다음과 같은 효과를 기대할 수 있을 것이다.As described above, according to the present invention, the following effects can be expected.
LNG 추진 소형 선박의 연료공급시스템에 최적화되어 안정적인 연료 공급과 운용의 편리성 및 공간집약성 모두를 충족시킬 수 있으며, 통합형 열교환기를 통하여 연료공급시스템이 차지하는 공간을 집약적으로 활용할 수 있는 이점과 더불어 제작비 또한 줄어드는 효과가 있다.Optimized for the fuel supply system of small LNG-powered ships, it can satisfy both stable fuel supply, operational convenience, and space intensiveness. In addition to the advantage of intensively utilizing the space occupied by the fuel supply system through the integrated heat exchanger, the manufacturing cost is also reduced. has a reducing effect.
또한, 항해 중 펌프 고장시에도 통합형 열교환기를 통해 LNG 연료탱크를 가압하는 시스템으로 신속히 전환하여 안정적인 연료공급이 가능하게 되어 운항에 따른 안정성이 확보되는 효과도 있다.In addition, even in the event of a pump failure during sailing, it is possible to quickly switch to a system that pressurizes the LNG fuel tank through an integrated heat exchanger, enabling stable fuel supply, thereby securing stability during operation.
도 1은 본 발명에 따른 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템의 개략적인 구성도이다.1 is a schematic configuration diagram of an LNG fuel supply system for a small vessel having a submersible pump and an integrated heat exchanger according to the present invention.
이하에서는 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하고자 한다. 설명에 앞서 본 발명의 이점 및 특징 및 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술되어 있는 실시예들을 참조하면 명확해질 것이다. 그리고 본 명세서에서 사용된 용어는 실시예들을 설명하기 위한 것으로 본 발명을 제한하고자 하는 것이 아니며, 이러한 용어 중 단수형은 문구에서 특별히 언급하지 않는 한 복수형도 포함하는 것이고, 설명 상에 방향을 지칭하는 단어는 설명의 이해를 돕기 위한 것으로 시점에 따라 변경 가능함을 주지하는 바이다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to the description, the advantages and features of the present invention and how to achieve them will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. In addition, the terms used in this specification are for describing the embodiments and are not intended to limit the present invention, and the singular form of these terms includes the plural form unless specifically stated in the phrase, and the word referring to the direction in the description It is noted that is to help the understanding of the description and is changeable according to the point in time.
이하 본 발명을 도면에 기초하여 본 발명의 바람직한 실시예에 대해 보다 자세히 설명을 하면 다음과 같다.Hereinafter, the present invention will be described in more detail with respect to preferred embodiments of the present invention based on the drawings.
도 1은 본 발명에 따른 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템의 개략적인 구성도이다.1 is a schematic configuration diagram of an LNG fuel supply system for a small vessel having a submersible pump and an integrated heat exchanger according to the present invention.
도 1에 도시된 바와 같이, 본 발명은 크게 LNG 연료탱크(100), 통합형 열교환기(200), 연료공급라인(300), 압력생성라인(400), 글리콜워터 공급라인(500) 및 분기라인(600)을 포함하여 구성된다.As shown in FIG. 1, the present invention largely consists of an LNG fuel tank 100, an integrated heat exchanger 200, a fuel supply line 300, a pressure generation line 400, a glycol water supply line 500, and a branch line. (600).
먼저, LNG 연료탱크(100)는 상부 증발공간의 증발가스(이하, '기체연료'로 함)와 하부에 저장된 LNG(이하, '액체연료'라 함)를 포함하며, 상기 액체연료 내에는 엔진에 일정 압력으로 액체연료를 공급하기 위한 잠수식 펌프(Submerged Pump)가 구비된다.First, the LNG fuel tank 100 includes boil-off gas in the upper evaporation space (hereinafter referred to as 'gaseous fuel') and LNG stored in the lower portion (hereinafter referred to as 'liquid fuel'), and the liquid fuel includes an engine A submerged pump is provided to supply liquid fuel at a certain pressure.
다음으로, 통합형 열교환기(200)는 액체연료를 공급받아 엔진이 요구하는 온도의 기체연료로 기화시키기나, 일정 온도의 프리가스로 가열시키기 위한 것으로, 제1 내부유로(20), 상기 제1 내부유로와 인접하는 제2 내부유로(30) 및 상기 제1, 2 내부유로와 대향되게 배치되어 상호 순차적으로 열교환하는 제3 내부유로(40)가 하나의 열교환기 형태로 형성된다.Next, the integrated heat exchanger 200 receives liquid fuel and vaporizes it into gaseous fuel at a temperature required by the engine or heats it with free gas at a constant temperature. A second internal passage 30 adjacent to the internal passage and a third internal passage 40 disposed opposite to the first and second internal passages to sequentially exchange heat with each other are formed in the form of a single heat exchanger.
보다 구체적으로, 도시된 바와 같이, 상기 제3 내부유로(40)에 상기 제1 및 제2 내부유로(20, 30)가 연이어 배치되는 형태로 이루어져 순차적으로 열교환이 가능하도록 구성된다.More specifically, as shown, the first and second internal passages 20 and 30 are arranged consecutively in the third internal passage 40 so as to sequentially exchange heat.
*다음으로, 연료공급라인(300)은 LNG 연료탱크(100)의 하부에 저장된 액체연료를 엔진(25)으로 공급할 수 있도록 안내하는 라인이다.* Next, the fuel supply line 300 is a line that guides the liquid fuel stored in the lower portion of the LNG fuel tank 100 to be supplied to the engine 25.
즉, 도시된 바와 같이 상기 연료공급라인(300)은 상기 LNG 연료탱크(100)의 액체연료를 상기 잠수식 펌프(10)로부터 일정 압력으로 공급받아 라인 ①을 따라 상기 제1 내부유로(20)로 안내하고, 상기 제1 내부유로(20)를 통과하는 액체연료가 후술할 제3 내부유로(40)를 통과하는 글리콜워터와 열교환되어 엔진이 요구하는 온도의 기체연료로 기화된 다음, 상기 기체연료를 라인 ②를 따라 최종 엔진(25)으로 공급되도록 하기 위한 구성이다.That is, as shown, the fuel supply line 300 receives the liquid fuel in the LNG fuel tank 100 at a constant pressure from the submersible pump 10 and flows through the first internal flow path 20 along the line ①. , and the liquid fuel passing through the first internal passage 20 is heat-exchanged with glycol water passing through the third internal passage 40 to be described later, vaporized into gaseous fuel at a temperature required by the engine, and then the gas It is a configuration for supplying fuel to the final engine 25 along the line ②.
다음으로, 상기 압력생성라인(400)은 LNG 연료탱크(100)의 하부에 저장된 액체연료를 일정 온도로 가열시켜, 보다 구체적으로 약 영하 130~50℃ 저온가스 상태인 프리가스(Pre-Gas)로 상기 LNG 연료탱크(100) 상부로 공급할 수 있도록 안내하는 라인이다.Next, the pressure generating line 400 heats the liquid fuel stored in the lower portion of the LNG fuel tank 100 to a certain temperature, and more specifically, pre-gas in a low-temperature gas state of about minus 130 to 50 ° C. This is a line guiding the supply to the upper portion of the LNG fuel tank 100.
즉, 도시된 바와 같이 상기 압력생성라인(400)은 상기 LNG 연료탱크(100)의 액체연료를 액면높이에 따른 압력으로 공급받아 라인 ④를 따라 상기 제2 내부유로(30)로 안내하고, 상기 제2 내부유로(30)를 통과하는 액체연료가 후술할 제3 내부유로(40)를 통과하는 글리콜워터와 열교환되어 일정 온도로 가열된 프리가스로 된 다음, 상기 프리가스를 라인 ⑤를 따라 최종 상기 LNG 연료탱크(100) 상부로 공급되도록 하기 위한 구성이다.That is, as shown, the pressure generating line 400 receives the liquid fuel in the LNG fuel tank 100 at a pressure according to the liquid level and guides it to the second internal flow passage 30 along the line ④, The liquid fuel passing through the second internal passage 30 is heat-exchanged with glycol water passing through the third internal passage 40 to be described later to become free gas heated to a certain temperature, and then the free gas is finally passed along line ⑤. It is configured to be supplied to the upper portion of the LNG fuel tank 100.
그리고, 상기 압력생성라인(400)에는 상기 LNG 연료탱크(100)의 압력을 일정하게 유지시키기 위한 제1 압력제어밸브(50)가 설치되며, 이때 상기 제1 압력제어밸브(50)는 상기 제2 내부유로(30)와 LNG 연료탱크(100) 사이에 위치하는 것이 바람직하다.In addition, a first pressure control valve 50 for maintaining the pressure of the LNG fuel tank 100 constant is installed in the pressure generating line 400, and at this time, the first pressure control valve 50 is 2 It is preferable to be located between the internal flow path 30 and the LNG fuel tank 100.
다음으로, 글리콜워터 공급라인(500)은 엔진(25)의 자켓워터(35, Jacket Water))에 의해 가열되는 글리콜워터 히터(45)로부터 열원을 공급받아 라인 ⑧을 따라 상기 제3 내부유로(40)로 가열된 글리콜워터를 공급할 수 있도록 안내하는 라인이다.Next, the glycol water supply line 500 receives a heat source from the glycol water heater 45 heated by the jacket water 35 (Jacket Water) of the engine 25, and along the line ⑧ the third internal flow path ( 40) to guide the supply of heated glycol water.
여기서, 제3 내부유로(40)를 통과한 글리콜워터는 다시 라인 ⑨를 따라 글리콜워터 탱크(55)에 수용되고, 이는 다시 글리콜워터 펌프(65)를 통해 상기 글리콜워터 히터(45)로 공급되도록 하여 순환구조로 형성될 수 있음은 물론이다.Here, the glycol water that has passed through the third internal flow path 40 is accommodated in the glycol water tank 55 along line ⑨ again, which is supplied to the glycol water heater 45 again through the glycol water pump 65 Of course, it can be formed into a circulation structure.
다음으로, 분기라인(600)은 상기 잠수식 펌프(10) 고장시에도 상기 LNG 연료탱크(100)의 액체연료를 엔진으로 공급되도록 하기 위한 라인으로, 이를 위하여 액체연료가 통과하는 상기 압력생성라인(400)으로부터 분기되어 액체연료가 통과하는 상기 연료공급라인(300)과 연결되게 된다.Next, the branch line 600 is a line for supplying the liquid fuel of the LNG fuel tank 100 to the engine even when the submersible pump 10 fails, and for this purpose, the pressure generating line through which the liquid fuel passes It is branched from 400 and connected to the fuel supply line 300 through which liquid fuel passes.
즉, 보다 구체적으로, 상기 분기라인(600)에 의해 상기 LNG 연료탱크(100)에서 공급받은 액체연료는 라인 ④에서 분기하여 라인 ①로 연결되며, 상기 분기라인(600)에는 상기 LNG 연료탱크(100)의 압력을 일정하게 유지시키기 위한 제2 압력제어밸브(60)가 설치된다.That is, more specifically, the liquid fuel supplied from the LNG fuel tank 100 by the branch line 600 is branched from the line ④ and connected to the line ①, and the branch line 600 has the LNG fuel tank ( 100) a second pressure control valve 60 for maintaining a constant pressure is installed.
따라서, 상기 잠수식 펌프(10) 고장시 연료공급라인(300)으로 액체연료의 공급이 중단되더라도, 상기 분기라인(600)을 통하여 상기 LNG 연료탱크(100)의 압력 및 제2 압력제어밸브(60)에 의해 적절한 압력으로 액체연료가 원활하게 공급되게 되며, 이렇게 공급된 액체연료는 앞서 상술한 바와 같이 제1 내부유로(20)를 통과하면서 상기 제3 내부유로(40)를 통과하는 글리콜워터와 열교환된 다음, 엔진이 요구하는 온도의 기체연료로 기화되어 최종 엔진(25)으로 공급되는 과정은 동일하다.Therefore, even if the supply of liquid fuel to the fuel supply line 300 is stopped when the submersible pump 10 fails, the pressure of the LNG fuel tank 100 and the second pressure control valve ( 60), the liquid fuel is smoothly supplied at an appropriate pressure, and the liquid fuel supplied in this way is glycol water passing through the third internal passage 40 while passing through the first internal passage 20 as described above After heat exchange, the process of being vaporized into gaseous fuel at the temperature required by the engine and supplied to the final engine 25 is the same.
*한편, 상기 압력생성라인(400)에서 상기 분기라인(600)으로 공급되지 아니하는 나머지 액체연료는 앞서 상술한 바와 같이 상기 제2 내부유로(30)를 통과하면서 상기 제3 내부유로(40)를 통과하는 글리콜워터와 열교환되어 일정 온도로 가열된 프리가스로 된 다음, 라인 ⑤를 따라 최종 LNG 연료탱크(100) 상부로 공급되는 과정은 동일하다.* Meanwhile, the remaining liquid fuel that is not supplied from the pressure generating line 400 to the branch line 600 passes through the second internal passage 30 as described above, while passing through the third internal passage 40 The process of being heat-exchanged with glycol water passing through to become free gas heated to a certain temperature and then being supplied to the top of the final LNG fuel tank 100 along line ⑤ is the same.
이렇게 하여, 잠수식 펌프(10)가 고장이 발생되더라도 압력생성라인(400)에 의해 프리가스가 LNG 연료탱크(100) 상부로 공급되면서 LNG 연료탱크(100) 내부를 가압하게 되므로, 그 결과 하부 액체연료가 원활하게 압력생성라인(400)을 통해 액체연료의 일부는 분기라인(600)을 통해 지속적으로 공급가능하게 되고, 나머지 액체연료는 통합형 열교환기(200)을 거쳐 프리가스로 되어 다시 LNG 연료탱크(100) 상부로 유입되게 되는 것이다.In this way, even if the submersible pump 10 fails, the free gas is supplied to the upper portion of the LNG fuel tank 100 by the pressure generating line 400 and pressurizes the inside of the LNG fuel tank 100, resulting in lower A portion of the liquid fuel can be supplied continuously through the branch line 600 through the pressure generating line 400 smoothly, and the remaining liquid fuel becomes free gas through the integrated heat exchanger 200 and is again LNG. It is introduced into the upper part of the fuel tank 100.
앞서 잠수식 펌프(10)에 의해 액체연료가 공급되는 방식(이를 소위 '펌프식 모드'라 함)으로 연료를 공급하다가, 잠수식 펌프(10)가 고장이 발생되더라도 LNG 연료탱크 내부을 일정 압력으로 가압(이를 소위 '가압식 모드'라 함)시켜 원활한 연료공급이 가능하게 되어 소형 선박에 안정적인 연료공급과 함께 운용편리성을 도모할 수가 있게 된다.Previously, while supplying fuel in a way in which liquid fuel is supplied by the submersible pump 10 (this is referred to as a 'pump mode'), even if the submersible pump 10 fails, the inside of the LNG fuel tank is maintained at a certain pressure. By pressurizing (this is referred to as 'pressurized mode'), smooth fuel supply is possible, so that it is possible to promote operational convenience along with stable fuel supply to small ships.
한편, 본 발명의 바람직한 실시예에 따르면, 압력생성라인(400)과 연료공급라인(300)사이에는 바이패스라인(700)이 더 포함될 수가 있다.Meanwhile, according to a preferred embodiment of the present invention, a bypass line 700 may be further included between the pressure generating line 400 and the fuel supply line 300 .
상기 바이패스라인(700)은 상기 프리가스가 통과하는 압력생성라인(400), 보다 구체적으로 라인 ⑤로부터 분기되어 액체연료가 통과하는 상기 연료공급라인(300), 보다 구체적으로는 라인 ①과 연결되며, 상기 바이패스라인(700)에는 상기 LNG 연료탱크(100)의 압력을 일정하게 유지시키기 위한 제3 압력제어밸브(70)가 설치된다.The bypass line 700 is branched from the pressure generating line 400 through which the free gas passes, more specifically, line ⑤, and is connected to the fuel supply line 300 through which liquid fuel passes, more specifically, line ①. A third pressure control valve 70 is installed in the bypass line 700 to keep the pressure of the LNG fuel tank 100 constant.
또한, 본 발명의 바람직한 실시예에 따르면, 상기 LNG 연료탱크(100)에는 내부 압력을 감지하는 압력감지센서(80)가 더 구비될 수가 있다.In addition, according to a preferred embodiment of the present invention, the LNG fuel tank 100 may further include a pressure sensor 80 for detecting an internal pressure.
상기 압력감지센서(80)를 통하여 상기 LNG 연료탱크(100)의 내부 압력을 실시간 입력받고, 이와 연동되어 상기 제1 및 제3 압력제어밸브(50, 70)가 제어되도록 함으로써 상기 LNG 연료탱크(100)에는 내부 압력를 일정하게 유지가능하게 된다.The LNG fuel tank ( 100), it is possible to keep the internal pressure constant.
즉, 상기 LNG 연료탱크(100)의 내부 압력이 일정값 이하로 떨어질 경우에 그 값을 상기 압력감지센서(80)가 입력받아 즉시 상기 제1 압력제어밸브(50)를 제어하면, 상기 압력생성라인(400)을 통해 공급되는 프리가스 량이 늘어나게 되고, 그 결과 LNG 연료탱크(100)의 내부 압력이 상승하게 된다.That is, when the internal pressure of the LNG fuel tank 100 drops below a certain value, the pressure sensor 80 receives the value and immediately controls the first pressure control valve 50 to generate the pressure. The amount of free gas supplied through the line 400 increases, and as a result, the internal pressure of the LNG fuel tank 100 rises.
반대로, 상기 LNG 연료탱크(100)의 내부 압력이 일정값 이상로 높아질 경우에 그 값을 상기 압력감지센서(80)가 입력받아 즉시 상기 제3 압력제어밸브(70)를 제어하면, 프리가스의 일부가 바이패스라인(700)을 따라 바이패스(By-pass)되어 연료공급라인(300)으로 공급되게 되어 통합형 열교환기(200)를 거쳐 최종 엔진(25)으로 공급되게 되고, 그 결과 LNG 연료탱크(100)의 내부 압력은 하강하게 된다.Conversely, when the internal pressure of the LNG fuel tank 100 rises above a certain value, the pressure sensor 80 receives the value and immediately controls the third pressure control valve 70, A portion is bypassed along the bypass line 700 and supplied to the fuel supply line 300 to be supplied to the final engine 25 through the integrated heat exchanger 200, and as a result, LNG fuel The internal pressure of the tank 100 decreases.
그리고, 상기 LNG 연료탱크(100)의 액체연료가 압력생성라인(400)을 통해 액체연료의 일부는 분기라인(600)을 통해 지속적으로 공급되고, 나머지 액체연료는 통합형 열교환기(200)을 거쳐 프리가스로 다시 LNG 연료탱크(100) 상부로 유입되게 되어 LNG 연료탱크(100) 내부의 액체연료를 가압하게 되며, 이때 압력생성라인(400)에 설치된 제1 압력제어밸브(50)는 상기 LNG 연료탱크(100)의 내부 압력에 의해 연동되어 제어된다.In addition, liquid fuel of the LNG fuel tank 100 is continuously supplied through the pressure generating line 400, a part of the liquid fuel is continuously supplied through the branch line 600, and the remaining liquid fuel is supplied through the integrated heat exchanger 200. The free gas is introduced into the upper part of the LNG fuel tank 100 again to pressurize the liquid fuel inside the LNG fuel tank 100, and at this time, the first pressure control valve 50 installed in the pressure generating line 400 is the LNG It is interlocked and controlled by the internal pressure of the fuel tank 100.
이와 같이, 본 발명의 경우 상기 LNG 연료탱크(100)의 내부 압력에 연동하여 제1 내지 3 압력제어밸브를 각각 제어하도록 구성되어 있으므로 연료공급시 정교한 유량 및 압력제어가 가능하게 되며, 그 결과 안정적인 연료 공급과 운용의 편리성이 도모될 수 있다.As described above, in the case of the present invention, since the first to third pressure control valves are respectively controlled in conjunction with the internal pressure of the LNG fuel tank 100, sophisticated flow and pressure control is possible during fuel supply, and as a result, stable Convenience of fuel supply and operation can be promoted.
또한, 소형 선박임에도 잠수식 펌프를 사용하도록 하여 엔진부하(load)에 따른 압력추정을 원활하게 하여 엔진에 안정적인 연료공급도 가능하게 되며, 무엇보다 잠수식 펌프 고장시에도 즉시 '가압식 모드'로 전환이 가능하게 되어 연료공급을 계속 유지할 수가 있게 된다.In addition, a submersible pump is used even for a small vessel, which facilitates pressure estimation according to engine load, enabling stable fuel supply to the engine. This makes it possible to maintain a continuous fuel supply.
한편, 액체가 공급되는 연료공급라인(300)에 압력감지센서(90)를 설치하고, 또한 잠수식 펌프(10)는 별도 가변 주판수 드라이브(VFD)와 같은 제어기(95)에 의해 제어되도록 할 경우, 상기 압력감지센서(90)로부터 신호를 상기 제어기(95)가 입력받아 상기 잠수식 펌프(10) 구동을 적절히 제어하게 할 수가 있으며, 그 결과 액체연료의 공급량도 적절히 가변할 수도 있게 된다.On the other hand, a pressure sensor 90 is installed in the fuel supply line 300 to which liquid is supplied, and the submersible pump 10 is controlled by a controller 95 such as a separate variable main plate drive (VFD). In this case, the controller 95 receives a signal from the pressure sensor 90 so that the operation of the submersible pump 10 can be appropriately controlled, and as a result, the amount of liquid fuel supplied can also be appropriately varied.
따라서, 본 발명의 바람직한 실시예에 따르면, 잠수식 펌프 고장시에도 즉시 '가압식 모드'로 전환이 가능함은 물론이고, 나아가 여러 가지 선박 운항조건에 따라 '펌프식 모드'와 '가압식 모드'를 필요에 따라 전환하여 사용할 수도 있어 엔진에 안정적인 연료공급 및 운용의 편리성을 도모할 수가 있다.Therefore, according to a preferred embodiment of the present invention, it is possible to immediately switch to the 'pressurized mode' even when the submersible pump fails, and furthermore, it is necessary to switch between the 'pump mode' and the 'pressurized mode' according to various ship operating conditions. It can be switched and used according to the engine, so it is possible to promote stable fuel supply to the engine and convenience of operation.
이상의 설명은 본 발명의 기술적 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위 내에서 다양한 수정, 변경및 치환이 가능함은 물론이다.The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions can be made by those skilled in the art without departing from the essential characteristics of the present invention. is of course

Claims (3)

  1. 액체연료 및 기체연료를 수용하고, 상기 액체연료 내에 잠수식 펌프가 구비되는 LNG 연료탱크;An LNG fuel tank accommodating liquid fuel and gaseous fuel and having a submersible pump in the liquid fuel;
    제1 내부유로, 상기 제1 내부유로와 인접하는 제2 내부유로 및 상기 제1, 2 내부유로와 대향되게 배치되어 상호 순차적으로 열교환하는 제3 내부유로가 형성되는 통합형 열교환기;An integrated heat exchanger having a first internal passage, a second internal passage adjacent to the first internal passage, and a third internal passage disposed opposite to the first and second internal passages to sequentially exchange heat with each other;
    상기 LNG 연료탱크의 액체연료를 상기 잠수식 펌프로부터 일정 압력으로 공급받아 상기 제1 내부유로로 안내하여 엔진이 요구하는 온도의 기체연료로 기화시켜 엔진으로 공급하는 연료공급라인;a fuel supply line for receiving the liquid fuel in the LNG fuel tank at a constant pressure from the submersible pump, guiding it to the first internal passage, vaporizing the liquid fuel at a temperature required by the engine, and supplying the liquid fuel to the engine;
    상기 LNG 연료탱크의 액체연료를 공급받아 상기 제2 내부유로로 안내하여 일정 온도로 가열시켜 프리가스로 상기 LNG 연료탱크 상부로 공급하고, 상기 LNG 연료탱크의 압력을 일정하게 유지시키기 위한 제1 압력제어밸브가 설치된 압력생성라인;A first pressure for receiving liquid fuel from the LNG fuel tank, guiding it to the second internal passage, heating it to a certain temperature, supplying free gas to the upper portion of the LNG fuel tank, and maintaining a constant pressure in the LNG fuel tank. a pressure generating line with a control valve;
    상기 엔진의 자켓워터에 의해 가열되는 글리콜워터 히터로부터 열원을 공급받아 상기 제3 내부유로로 공급하는 글리콜워터 공급라인; 및a glycol water supply line receiving a heat source from a glycol water heater heated by the jacket water of the engine and supplying the heat to the third internal passage; and
    액체연료가 통과하는 상기 압력생성라인으로부터 분기되어 액체연료가 통과하는 상기 연료공급라인과 연결되고, 상기 LNG 연료탱크의 압력을 일정하게 유지시키기 위한 제2 압력제어밸브가 설치되는 분기라인을 포함하는 것을 특징으로 하는 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템.Branching from the pressure generating line through which the liquid fuel passes, connected to the fuel supply line through which the liquid fuel passes, and including a branch line in which a second pressure control valve for maintaining the pressure of the LNG fuel tank constant is installed LNG fuel supply system for small ships having a submersible pump and an integrated heat exchanger, characterized in that.
  2. 제1항에 있어서,According to claim 1,
    상기 프리가스가 통과하는 압력생성라인으로부터 분기되어 액체연료가 통과하는 상기 연료공급라인과 연결되고, 상기 LNG 연료탱크의 압력을 일정하게 유지시키기 위한 제3 압력제어밸브가 설치되는 바이패스라인을 포함하는 것을 특징으로 하는 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템.A bypass line branched off from the pressure generating line through which the free gas passes and connected to the fuel supply line through which liquid fuel passes, and a third pressure control valve for maintaining a constant pressure in the LNG fuel tank is installed. LNG fuel supply system for small ships having a submersible pump and an integrated heat exchanger, characterized in that.
  3. 제2항에 있어서,According to claim 2,
    상기 LNG 연료탱크에는 내부 압력을 감지하는 압력감지센서가 구비되고, 상기 제1 및 제3 압력제어밸브는 상기 압력감지센서에 의해 제어되는 것을 특징으로 하는 잠수식 펌프와 통합형 열교환기를 구비한 소형선박용 LNG 연료 공급 시스템.The LNG fuel tank is provided with a pressure sensor for detecting internal pressure, and the first and third pressure control valves are controlled by the pressure sensor. LNG fuel supply system.
PCT/KR2022/015649 2021-10-26 2022-10-14 Lng fuel supply system for small ship, having submerged pump and integrated heat exchanger WO2023075241A1 (en)

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