CN112253994A - System and method for supplying fuel to ship engine - Google Patents

System and method for supplying fuel to ship engine Download PDF

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Publication number
CN112253994A
CN112253994A CN202011003193.8A CN202011003193A CN112253994A CN 112253994 A CN112253994 A CN 112253994A CN 202011003193 A CN202011003193 A CN 202011003193A CN 112253994 A CN112253994 A CN 112253994A
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China
Prior art keywords
gas
hydrogen
fuel
storage tank
compressed
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Granted
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CN202011003193.8A
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Chinese (zh)
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CN112253994B (en
Inventor
段斌
宋炜
吴丽萍
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Hudong Zhonghua Shipbuilding Group Co Ltd
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Hudong Zhonghua Shipbuilding Group Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • 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
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/14—Use of propulsion power plant or units on vessels the vessels being motor-driven relating to internal-combustion engines
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/065—Arrangements for producing propulsion of gases or vapours
    • F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0447—Composition; Humidity
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0642—Composition; Humidity
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/07—Actions triggered by measured parameters
    • F17C2250/072—Action when predefined value is reached
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/34—Hydrogen distribution
    • 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
    • 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
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention discloses a system and a method for supplying fuel to a ship engine, wherein the system comprises a hydrogen generation unit, a natural gas compressor, a fuel pipe and the ship engine, wherein the hydrogen generation unit is used for converting part of evaporated gas generated in a liquefied natural gas storage cabin into compressed hydrogen and conveying the compressed hydrogen to the fuel pipe; the natural gas compressor is used for compressing another part of the boil-off gas generated in the liquefied natural gas storage tank and conveying the compressed boil-off gas to the fuel pipe; the fuel pipe is used for supplying the received mixed compressed gas to the ship engine under reduced pressure. The invention can utilize the existing LNG storage tank evaporated gas on the LNG ship to generate hydrogen, and the hydrogen is mixed with natural gas to be used as ship fuel, thereby realizing the purposes of improving the combustion efficiency of the diesel engine, reducing the gas consumption and reducing the operation cost.

Description

System and method for supplying fuel to ship engine
Technical Field
The invention relates to the technical field of ship construction, in particular to a system and a method for supplying fuel to a ship engine.
Background
The natural gas is a novel energy source for replacing coal and petroleum due to the characteristics of cleanness, convenience and high heat value. Since the space after the natural gas is cooled and liquefied can be reduced by 600 times, the natural gas is usually transported in a liquid state by a ship, and an LNG ship is a special ship for transporting LNG. The liquid cargo tank loaded with LNG may cause part of the stored liquid LNG to be gasified when receiving external heat, the pressure in the liquid cargo tank may be increased when LNG boil-off gas (BOG) is gradually increased, and in order to control the pressure in the liquid cargo tank, the BOG is currently mainly used as fuel and directly delivered to a dual-fuel engine for combustion.
Disclosure of Invention
The present invention provides a system and method for supplying fuel to a marine engine, which solves the above problems in the prior art.
A system for supplying fuel to a marine engine, comprising a hydrogen generating unit, a natural gas compressor, a fuel pipe and a marine engine;
the hydrogen generation unit is used for converting a part of the evaporation gas generated in the liquefied natural gas storage tank into compressed hydrogen and conveying the compressed hydrogen to the fuel pipe;
the natural gas compressor is used for compressing another part of the evaporation gas generated in the liquefied natural gas storage tank and conveying the evaporation gas to the fuel pipe;
the fuel pipe is used for supplying the received mixed compressed gas to the ship engine in a decompression mode.
Preferably, the hydrogen generation unit includes:
a hydrogen generator for converting a part of the boil-off gas generated in the liquefied natural gas storage tank into hydrogen gas;
a hydrogen compressor for compressing the hydrogen gas into compressed hydrogen gas;
and the hydrogen storage tank is used for storing the compressed hydrogen, and an outlet of the hydrogen storage tank is connected with an inlet of the fuel pipe through an outlet pipeline.
Preferably, the hydrogen generator may be further used to convert a portion of the boil-off gas generated in the lng storage tank into fuel oil, which is stored in the fuel oil storage tank.
Preferably, a control valve for controlling the flow rate of the compressed hydrogen delivered to the fuel pipe to adjust the mixing ratio of the compressed hydrogen and the compressed natural gas is installed on the outlet pipe of the hydrogen storage tank;
the fuel pipe is provided with a gas component sensor for detecting the mixing ratio of compressed hydrogen and compressed natural gas in the mixed compressed gas and a gas valve bank for decompressing the mixed compressed gas to supply the mixed compressed gas to the ship engine.
Preferably, the ship engine adopts a dual-fuel diesel engine which can take gas and oil as fuel.
Preferably, the natural gas compressor is a normal temperature gas compressor, and a gas heater for heating another part of the boil-off gas generated in the liquefied natural gas storage tank is further installed at an air inlet of the natural gas compressor.
Preferably, the natural gas compressor is a cryogenic gas compressor.
Preferably, the liquefied natural gas storage tank can be selected from a monolithic type, a membrane type or a free-standing type,
any one of liquefied natural gas, liquefied ethane and liquefied petroleum gas can be stored in the liquefied natural gas storage cabin.
A fuel supply method of a ship engine specifically comprises the following steps:
a part of evaporated gas generated in the liquefied natural gas storage cabin is mixed with oxygen in the hydrogen generator to react to generate hydrogen, the hydrogen is pressurized and compressed in the hydrogen compressor and then stored in the hydrogen storage tank, and the compressed hydrogen in the hydrogen storage tank is conveyed to the fuel pipe through an outlet pipeline;
pressurizing and compressing another part of the evaporation gas generated in the liquefied natural gas storage cabin by a natural gas compressor and then conveying the compressed evaporation gas to a fuel pipe;
the fuel pipe depressurizes and supplies the received mixed compressed gas to the marine engine.
Preferably, a part of the boil-off gas generated in the lng storage tank is converted into fuel in the hydrogen generator and stored in a fuel storage tank, and the fuel in the fuel storage tank is pressurized and then directly supplied to the engine of the ship.
The invention has the beneficial effects that:
1. according to the invention, natural gas evaporated in the existing LNG storage tank on the LNG ship can be utilized, part of evaporated gas generated in the liquefied natural gas storage tank is converted into hydrogen, then the hydrogen is mixed with the other part of evaporated gas generated in the liquefied natural gas storage tank, and the natural gas mixed with a certain proportion of hydrogen is supplied to the dual-fuel diesel engine for combustion, so that the combustion efficiency of the dual-fuel diesel engine can be greatly improved, the consumption of the natural gas is reduced, the operation cost is reduced, and the environment friendliness is improved. Through a plurality of tests, the combustion efficiency of the mixed gas obtained by doping 5% of hydrogen into the natural gas fuel can be improved by 15%.
2. The invention can be widely applied to low-temperature liquid cargo transport ships and LNG power ships of various sizes and types, and has wide application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
The reference numerals in the figures have the meaning:
the liquefied natural gas storage tank is 1, the hydrogen generator is 2, the hydrogen compressor is 3, the hydrogen storage tank is 4, the control valve is 5, the gas component sensor is 6, the fuel storage tank is 7, the gas heater is 8, the natural gas compressor is 9, the gas valve bank is 10, the ship engine is 11, the fuel pipe is 12, and the outlet pipeline is 13.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The invention provides a system and a method for supplying fuel to a ship engine, which can convert part of evaporated gas generated in an liquefied natural gas storage tank 1 into hydrogen, then mix the hydrogen with the other part of evaporated gas generated in the liquefied natural gas storage tank 1 in a fuel pipe 12, and supply the natural gas mixed with a certain proportion of hydrogen to a dual-fuel diesel engine 11 for combustion, thereby greatly improving the combustion efficiency of the dual-fuel diesel engine 11 and reducing the consumption of the natural gas. Through a plurality of tests, the combustion efficiency of the mixed gas obtained by doping 5% of hydrogen into the natural gas fuel can be improved by 15%.
The system for supplying fuel to a marine engine of the present invention includes a hydrogen generation unit, a natural gas compressor 9, a fuel pipe 12, and a marine engine 11.
The hydrogen generation unit is configured to convert a part of the boil-off gas generated in the lng storage tank 1 into compressed hydrogen and deliver the compressed hydrogen to the fuel pipe 12.
The liquefied natural gas storage tank 1 is a storage tank loaded with cryogenic Liquefied Natural Gas (LNG) at-163 ℃, which may be vaporized if the ambient temperature of the liquefied natural gas is slightly increased and exceeds-163 ℃. For example, during the transportation of LNG by a ship, although the LNG storage tank is configured with a thermal insulation structure, it is not necessarily possible to completely prevent heat from entering the LNG through the storage tank, so that the LNG is continuously vaporized during the transportation of the LNG by the LNG carrier, and boil-off gas (BOG) is generated in the LNG storage tank.
In this embodiment, the liquefied natural gas storage tank 1 is an integral, film-type, or independent storage tank defined in the international regulations on the structure and facilities of bulk transport liquefied gas vessels (IGC Code), and further, the independent storage tank may be an a-type, B-type, or C-type independent tank. Any one of liquefied natural gas LNG, liquefied ethane LEG, and liquefied petroleum gas LPG may be stored in the liquefied natural gas storage tank 1.
Specifically, the hydrogen generation unit includes a hydrogen generator 2, a hydrogen compressor 3, and a hydrogen storage tank 4.
The hydrogen generator 2 mixes a part of Boil Off Gas (BOG) generated in the lng storage tank 1 with oxygen using FT (Fischer-Tropsch) technology or equivalent technology to generate hydrogen.
The hydrogen compressor 3 serves to compress the hydrogen into compressed hydrogen.
The hydrogen storage tank 4 is used for storing the compressed hydrogen, an outlet of the hydrogen storage tank 4 is connected to an inlet of the fuel pipe 12 through an outlet pipe 13, and a control valve 5 is installed on the outlet pipe 13 for controlling the flow rate of the compressed hydrogen delivered to the fuel pipe 12 to adjust the mixing ratio of the compressed hydrogen and the compressed natural gas.
The natural gas compressor 9 is configured to compress another part of Boil Off Gas (BOG) generated in the lng storage tank 1 and send the compressed BOG to the fuel pipe 12.
The natural gas compressor 9 can be a low-temperature gas compressor or a normal-temperature gas compressor. When the natural gas compressor 9 is a cryogenic gas compressor, another part of Boil Off Gas (BOG) generated in the lng storage tank 1 is directly delivered to the natural gas compressor 9, and the natural gas compressor 9 compresses and increases the part of BOG gas and then delivers the part of BOG gas to the fuel pipe 12 through a pipeline. When the natural gas compressor 9 is a normal-temperature gas compressor, another part of Boil Off Gas (BOG) generated in the liquefied natural gas storage tank 1 is heated by the gas heater, the heated part of BOG gas enters the natural gas compressor 9 through the pipeline for compression and pressurization, and the pressurized natural gas enters the fuel pipe 12 through the pipeline to be mixed with hydrogen.
The fuel pipe 12 is used for supplying the received mixed compressed gas (mixed compressed hydrogen gas and compressed natural gas) to the ship engine 11 under reduced pressure.
The fuel pipe 12 is provided with a gas component sensor 6 for detecting a mixing ratio of compressed hydrogen gas and compressed natural gas in the mixed compressed gas, and a gas valve block 10 for decompressing the mixed compressed gas to supply the compressed gas to the ship engine 11.
The gas composition sensor 6 transmits a signal detected by it to the control valve 5, and the gas composition sensor 6 is electrically connected to the control valve 5. The control valve 5 controls the flow of the compressed hydrogen in the outlet pipeline 13 according to the valve opening degree of the received signal, and adjusts the mixing ratio of the compressed hydrogen and the compressed natural gas in the compression fuel pipe 12.
The gas valve group 10 is a module for adjusting gas pressure according to the load of the dual-fuel engine 11, and includes a filter, a pressure regulating valve, a quick-closing valve, a nitrogen purge control valve, a flowmeter and other components which are connected in series in sequence according to the gas flow direction, and the mixed compressed gas in the fuel pipe 12 enters the dual-fuel engine 11 after the pressure is adjusted by the gas valve group.
In this embodiment, the marine engine 11 is a dual-fuel diesel engine that can use fuel gas and fuel oil as fuel. The hydrogen compressor 3 and the natural gas compressor 9 can be selected from an electric motor or a hydraulically driven piston type compressor, a screw type compressor or a centrifugal type compressor, such as a motor driven compressor, and can be further selected from a variable frequency control compressor.
Preferably, the hydrogen generator 2 may be further used to convert a portion of the boil-off gas generated in the lng storage tank 1 into fuel oil, which is stored in the fuel oil storage tank 7.
The fuel supply method of the ship engine specifically comprises the following steps:
a part of the vaporized gas generated in the liquefied natural gas storage tank 1 is mixed with oxygen in the hydrogen generator 2 to react to generate hydrogen, the hydrogen is pressurized and compressed in the hydrogen compressor 3 and then stored in the hydrogen storage tank 4, and the compressed hydrogen in the hydrogen storage tank 4 is conveyed to the fuel pipe 12 through an outlet pipeline;
another part of the boil-off gas generated in the liquefied natural gas storage tank 1 is pressurized and compressed by the natural gas compressor 9 and then is conveyed to the fuel pipe 12;
the fuel pipe 12 depressurizes and supplies the received mixed compressed gas to the marine engine 11.
Preferably, the hydrogen generator 2 may also select a liquid fuel production mode in which a portion of the boil-off gas generated in the lng storage tank 1 is converted into fuel, the generated fuel is stored in the fuel storage tank 7, and the fuel in the fuel storage tank 7 is pressurized and then directly supplied to the ship engine 11.
The following specifically describes an embodiment of the present invention by taking an 8-thousand cubic LNG carrier as an example.
The LNG transport ship is provided with 2 WinGD 5RT-Flex50DF model dual-fuel diesel engines, the selected design power (SMCR) of the dual-fuel diesel engines is 6700kW, the design rotating speed is 116r/min, and the service condition (NCR: 85% SMCR) is 5695kW @109.9 r/min. The design pressure of each dual-fuel diesel engine in the fuel supply system is 13.2barg, the fuel gas consumption of each dual-fuel diesel engine under 85% load is 775kg/h, and the total fuel gas consumption of the two dual-fuel diesel engines is 1550 kg/h.
The ship adopts a GTT NO 96L 03+ type film type enclosure system, the daily evaporation rate is 0.14 percent, namely 47 tons of LNG evaporation gas exist every day, and the total natural gas flow rate per hour is about 1950 kg/h. Inputting redundant 400kg/h of evaporated gas into a hydrogen generator 2 to produce about 80kg/h of hydrogen, and conveying the hydrogen to a hydrogen storage tank 4 for storage through a hydrogen compressor 3; the opening degree of the control valve 5 is controlled by the gas composition sensor 6 to adjust the mixing ratio of the hydrogen gas into the natural gas.
The LNG evaporation gas is heated and pressurized by a gas heater 8 and a natural gas compressor 9, mixed with 5% hydrogen and then conveyed to a gas valve bank 10, the gas valve bank 10 adjusts the gas production supply pressure and supply quantity according to the load of the dual-fuel diesel engine, and the mixed fuel of hydrogen and natural gas is input into the dual-fuel diesel engine, so that the heat efficiency of the diesel engine is improved by about 10%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A system for supplying fuel to a marine engine, comprising a hydrogen generating unit, a natural gas compressor, a fuel pipe and a marine engine;
the hydrogen generation unit is used for converting a part of the evaporation gas generated in the liquefied natural gas storage tank into compressed hydrogen and conveying the compressed hydrogen to the fuel pipe;
the natural gas compressor is used for compressing another part of the evaporation gas generated in the liquefied natural gas storage tank and conveying the evaporation gas to the fuel pipe;
the fuel pipe is used for supplying the received mixed compressed gas to the ship engine in a decompression mode.
2. The system for supplying fuel to a marine engine according to claim 1, wherein the hydrogen generation unit includes:
a hydrogen generator for converting a part of the boil-off gas generated in the liquefied natural gas storage tank into hydrogen gas;
a hydrogen compressor for compressing the hydrogen gas into compressed hydrogen gas;
and the hydrogen storage tank is used for storing the compressed hydrogen, and an outlet of the hydrogen storage tank is connected with an inlet of the fuel pipe through an outlet pipeline.
3. The system for fueling a marine engine as recited in claim 2, wherein the hydrogen generator is further operable to convert a portion of the boil-off gas generated in the lng storage tank to fuel oil, the fuel oil being stored in a fuel oil storage tank.
4. The system for supplying fuel to a marine engine according to claim 2, wherein a control valve for controlling the flow rate of the compressed hydrogen gas delivered to the fuel pipe to adjust the mixing ratio of the compressed hydrogen gas and the compressed natural gas is installed on the outlet pipe of the hydrogen storage tank;
the fuel pipe is provided with a gas component sensor for detecting the mixing ratio of compressed hydrogen and compressed natural gas in the mixed compressed gas and a gas valve bank for decompressing the mixed compressed gas to supply the mixed compressed gas to the ship engine.
5. The system for supplying fuel to a marine engine according to claim 1 or 4, wherein the marine engine employs a dual-fuel diesel engine that can be fueled with gas and oil.
6. The system for supplying fuel to an engine of a marine vessel according to claim 1, wherein the natural gas compressor is an ambient temperature gas compressor, and a gas heater for heating another part of the boil-off gas generated in the liquefied natural gas storage tank is further installed at an inlet of the natural gas compressor.
7. The system for fueling a marine engine as recited in claim 1, wherein the natural gas compressor is a cryogenic gas compressor.
8. The system for fueling a marine engine as recited in claim 1, wherein the lng storage tank is selected from an integrated type, a membrane type or a free-standing type, and any one of lng, lng and lpg is stored in the lng storage tank.
9. A fuel supply method for a ship engine is characterized by comprising the following steps:
a part of evaporated gas generated in the liquefied natural gas storage cabin is mixed with oxygen in the hydrogen generator to react to generate hydrogen, the hydrogen is pressurized and compressed in the hydrogen compressor and then stored in the hydrogen storage tank, and the compressed hydrogen in the hydrogen storage tank is conveyed to the fuel pipe through an outlet pipeline;
pressurizing and compressing another part of the evaporation gas generated in the liquefied natural gas storage cabin by a natural gas compressor and then conveying the compressed evaporation gas to a fuel pipe;
the fuel pipe depressurizes and supplies the received mixed compressed gas to the marine engine.
10. The method for fueling a marine engine according to claim 9, wherein a part of the boil-off gas generated in the lng storage tank is converted into fuel in the hydrogen generator and stored in a fuel storage tank, and the fuel in the fuel storage tank is pressurized and then directly supplied to the marine engine.
CN202011003193.8A 2020-09-22 2020-09-22 System and method for supplying fuel to ship engine Active CN112253994B (en)

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