CN108026865A - Ship fuel gas feed system - Google Patents

Ship fuel gas feed system Download PDF

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Publication number
CN108026865A
CN108026865A CN201680040371.XA CN201680040371A CN108026865A CN 108026865 A CN108026865 A CN 108026865A CN 201680040371 A CN201680040371 A CN 201680040371A CN 108026865 A CN108026865 A CN 108026865A
Authority
CN
China
Prior art keywords
pressure
fuel gas
sustainer
gas
gas feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201680040371.XA
Other languages
Chinese (zh)
Inventor
汤浅伸哉
渡边贵士
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Yi ace Shipbuilding Co., Ltd.
Original Assignee
Mitsui Engineering and Shipbuilding Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Engineering and Shipbuilding Co Ltd filed Critical Mitsui Engineering and Shipbuilding Co Ltd
Publication of CN108026865A publication Critical patent/CN108026865A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • 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
    • F02M21/0215—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
    • 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
    • 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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • 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

Abstract

So as to the low-speed diesel engine for carrying out gas burning sets the 1st, the 2nd fuel gas feeding pipe (14), (21) that fuel gas is provided to sustainer (12) as sustainer (12).The the 1st, the 2nd controller (17), (28) for the pressure for being used to control the fuel gas provided from the 1st, the 2nd fuel gas feeding pipe (14), (21) to sustainer (12) are set.Pressure control in 1st, the 2nd controller (17), (28) is carried out based on speed setting value SN.Interior during transition when speed setting value SN is changed, the pressure control in the 1st, the 2nd controller (17), (28) is switched to the control of the fuel gas requirement pressure based on Main Engine Control Unit (20) output.

Description

Ship fuel gas feed system
Technical field
The present invention relates to the fuel gas feed system suitable for liquefied gas carrier or liquefied gas as fuel ship, the liquefaction Gas cargo ship or liquefied gas as fuel ship, which are equipped with, can carry out the low-speed diesel engine of gas burning as sustainer.
Background technology
From the viewpoint of reducing carrying capacity of environment, improving energy consumption, in recent years, made using gas burning low-speed diesel engine For the sustainer of LNG cargo ships, and utilize spontaneous boil-off gas (the NATURAL BOG in LNG cargo tanks；It is natural Boil-off gas) be used as sustainer fuel composition, be well-known.But in gas burning low-speed diesel engine, root According to sustainer the prespecified necessary fuel gas pressure in the fuel gas inlet portion of sustainer of load, it is necessary to Pressure is required to provide fuel gas with this.Therefore, in the case where using boil-off gas as fuel, it is necessary to utilize gases at high pressure The boil-off gas is compressed to and requires pressure by compressor.Moreover, as the method that high pressure fuel gas is generated with low power consumption, by liquid Change natural gas to be pressurizeed with high pressure liquid pump and heat it and become the composition with the gases at high pressure for requiring pressure, and it is many Well known (patent document 1).
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2012-177333 publications
The content of the invention
Problems to be solved by the invention
The load of the sustainer of ship constantly changes because of meteorological or walrus during due to navigation, if according to master The requirement pressure of engine and control the supply pressure for the fuel gas for feeding to sustainer, then control become unstable, cause Supply pressure does not catch up with requirement pressure, such as is possible to the performance range more than control since the structure of equipment is different, or Cause to set between pressure and actual pressure and produce constant deviation.
It is an object of the present invention to even if there is load to change, also can be with stable pressure to gas burning can be carried out The entrance of sustainer provides fuel gas.
A technical solution to solve project
The ship fuel gas feed system of the present invention, is that can carry out gas burning to be used as sustainer Low-speed diesel engine provides the fuel gas feed system of fuel gas, possesses：The gas that fuel gas is provided to sustainer supplies To unit, and control the pressure control unit of the supply pressure of the fuel gas provided to sustainer, pressure control unit Speed setting value setting supply pressure based on sustainer.
When speed setting value changes, pressure control unit is not based on the speed setting value and sets supply pressure.No During supply pressure being set based on speed setting value, such as the transition of the conversion corresponding to the rotating speed with sustainer Period.During transition, pressure control unit is by from the supply pressure set based on speed setting value before changing to based on change The change of the supply pressure of speed setting value setting after more is postponed.During transition, supply pressure is for example set as leading The requirement pressure of engine.
Fuel gas is, for example, the boil-off gas in cargo tank.Gas feed unit, which possesses, to be compressed fuel gas and to master The high-pressure compressor that engine provides, the discharge pressure of pressure control unit control high-pressure compressor are supplied with controlling Pressure.Moreover, gas feed unit possesses the high pressure liquid pump for pressurizeing and be used as fuel gas to be provided to sustainer liquefied gas, The discharge pressure of pressure control unit control high pressure liquid pump is to control supply pressure.
The feature of the ship of the present invention is to possess above-mentioned fuel gas feed system.
Invention effect
According to the present invention, even if there is load to change, can also be started with stable pressure to the master that can carry out gas burning The entrance of machine provides fuel gas.
Brief description of the drawings
Fig. 1 is the block diagram of the composition for the fuel gas feed system for being denoted as an embodiment of the invention.
Fig. 2 is the block diagram for the composition for representing the 1st, the 2nd controller.
Fig. 3 is the curve map for the relation for representing engine loading and requiring pressure.
Fig. 4 is the block diagram of the composition for the fuel gas feed system for representing the 1st variation.
Fig. 5 is the block diagram of the composition for the fuel gas feed system for representing the 2nd variation.
Embodiment
In the following, referring to the drawings, embodiment of the present invention is illustrated.
Fig. 1 is the block diagram of the composition for the fuel gas feed system for representing an embodiment of the invention.
The fuel gas feed system 10 of present embodiment is suitable for the ship of the liquefied gas of transport natural gas etc., liquefied gas (being in the present embodiment LNG (liquefied natural gas)) is loaded on the cargo tank 11 being arranged in hull.Sustainer 12 is The low-speed diesel engine of gas burning can be carried out, the 1st fuel gas feeding pipe including high-pressure compressor 13 can be passed through 14 provide the spontaneous boil-off gas (NATURAL BOG) in cargo tank 11 to sustainer 12.
The boil-off gas produced in cargo tank 11 is conveyed by the upstream lateral line of the 1st fuel gas feeding pipe 14 Compressed to high-pressure compressor 13, and in high-pressure compressor 13.Then, the boil-off gas compressed is used as " high pressure Gas " is sent to sustainer 12 by the 1st fuel gas feeding pipe 14 in downstream.High-pressure compressor 13 is for example For compound compressor, possess the low-pressure stage 13A of upstream side and the final level 13B in downstream.Such as can be from low-pressure stage 13A by dividing Bye-pass 15 sends out fuel gas " low-pressure gas " relatively low as pressure, can be to gas burning generators engine Fuel gas is provided.Moreover, the remaining BOG not run out of with engine for sustainer 12 or generator, can also conduct Fuel gas is provided by branch line 15 to BOG processing units (boiler, gas combustion apparatus, reliquefaction installation etc.).In addition, The pipeline of residual gas is sent out to BOG processing units, is configured to the discharge from the final level 13B of high-pressure compressor 13 Side provides again after being depressurized to the requirement pressure of BOG processing units.Although in addition, in the present embodiment, by low-pressure stage to high pressure Level is recited as a multistage pressure gas compressor, but can also be configured to using low-pressure stage as other compressor, by low pressure Gas compressor is arranged in series with high-pressure compressor.
In high-pressure compressor 13, set in the discharge side of final level 13B and be used to make fuel gas to final level 13B's Suck the 1st circulation line 16 of side reflux.The 1st valve for being used for controlling the gas flow being refluxed is set in the 1st circulation line 16 16V, the aperture of the 1st valve 16V are controlled by the 1st controller 17.In addition, the discharge side in final level 13B sets pressure sensor 18, Measure to sustainer 12 provide fuel gas discharge side pressure value P V1.On the other hand, supplied in the 1st fuel gas The upstream side of pipeline 14 sets the pressure sensor 19 for the pressure PV2 for being used to measure the boil-off gas in cargo tank 11.Though in addition, Multiple cargo tanks 11 are provided with right hull, but in the present embodiment, 1 point on the public pipe of multiple cargo tanks 11 is surveyed Measure pressure PV2.But it is also possible to pressure is measured in many places and is averaged value as pressure PV2.
Pressure value P V1, PV2 that these are measured to the input of the 1st controller 17, meanwhile, input is controlled from sustainer The fuel gas requirement pressure SP1 and rotating speed (velocity of rotation) setting value SN of the sustainer 12 of device 20 and by operating Pressure set points SP2 in the cargo tank 11 of personnel setting etc..As described later, the 1st controller 17 is based on these values to the 1st circulation The aperture of 1st valve 16V of pipeline 16 is adjusted, and controls what is provided from the 1st fuel gas feeding pipe 14 to sustainer 12 The quantity delivered of boil-off gas.
In the fuel gas feed system 10 of present embodiment, the 2nd fuel gas feeding pipe 21 is also equipped with.2nd combustion Material gas feed line 21 possesses pump 22 of the configuration near the bottom in cargo tank 11, according to operation mode described later, passes through Pump 22 draws the liquefied gas in cargo tank 11.In the 2nd fuel gas feeding pipe 21, the liquefied gas being drawn temporarily is stored in Suction cylinder 23.Moreover, being connected with high pressure liquid pump 24 in the downstream of suction cylinder 23, the liquefied gas in suction cylinder 23 is pressurized and quilt It is sent to gas heater 25.In gas heater 25, the liquefied gas to pressurize through high pressure liquid pump 24 is heated, gasifies, and conduct Gases at high pressure are provided to sustainer 12.In addition, in the case that the 1st fuel gas feeding pipe 14 is not used by, In order to which liquefied gas to be used as to the fuel of gas burning generators engine, can also be set in the downstream of gas heater 25 to gas Body burning generators provide the pipeline of fuel gas with engine, or are branched out before suction cylinder 23 for being fired to gas Burn the pipeline that generator provides gas with engine.
High pressure liquid pump 24 is driven by motor 26, and motor 26 is by inverter 27 by 28 drive control of the 2nd controller.In high pressure The downstream of liquid pump 24, which is set, to be used to make the 2nd circulation line 29 that liquefied gas flows back to suction cylinder 23, on the 2nd circulation line 29 The 2nd valve 29V for being used for controlling the flow of lpg being refluxed is set.To the input of the 2nd controller 28 from sustainer control dress 20 fuel gas requirement pressure SP1 and speed setting value SN is put, while input is arranged on the 2nd fuel gas feeding pipe 21 High pressure liquid pump 24 and gas heater 25 between pressure sensor 30 measured by pressure value P V3.As described later, the 2nd Controller 28 is adjusted the aperture of the 2nd valve 29V according to operation mode or operating condition, while the driving to motor 26 carries out Control.In addition, motor 26 can be set to hydraulic drive motor, in this case, not by inverter 27, but pass through hydraulic pressure Driving of the driving source to hydraulic drive motor is controlled.In addition, in the present embodiment, the 2nd circulation line 29 is drawn towards pumping Suction tube 23, but cargo tank 11 can also be drawn towards.
In addition, set in suction cylinder 23 for making the boil-off gas in cylinder to the upstream of the 1st fuel gas feeding pipe 14 3rd circulation line 31 of side (11 side of cargo tank) reflux, the 3rd valve 31V is set in the 3rd circulation line 31.In addition, in the 2nd fuel The position for just going out cargo tank 11 of gas feed line 21, which is set, to be used to make the 4th valve 21V that the load of pump is kept constant, also, In immediately its downstream, the branch line 32 for the supply pressure for being used to adjust the liquefied gas provided to high pressure liquid pump 24 is set, point Bye-pass 32 possesses the 5th valve 32V.
In addition, it can also substantially ensure that NPSH (the Net Positive of high pressure liquid pump 24 being not provided with suction cylinder 23 Suction Head；Effective inlet head), set and replace carrying out the gas that gasifies between cargo tank 11 and high pressure liquid pump 24 In the case of the component of the suction cylinder 23 of removal, it is not necessary to suction cylinder 23 is set, in the case, is also not provided with the 3rd circulation line 31, the 2nd circulation line 29 is drawn towards cargo tank 11.
In addition, in the present embodiment, by the remaining BOG of branch line 15 to BOG processing units (boiler, gas Burner, reliquefaction installation etc.) offer, be arranged on the 6th valve 15V of branch line 15 by using the adjustment of the 3rd controller 33 Aperture control.Cargo tank pressure value P V2 and the pressure set points SP2 set by operating personnel are inputted to the 3rd controller 33, The aperture of the 6th valve 15V is adjusted based on these values, residue BOG is provided to BOG processing units.
In the present embodiment, in the state of liquefied gas loading, when liquefied gas carrier is than BOG yield and main hair When the benchmark operation point of the fuel consumption balance of motivation 12 is more by region (high rotational speed region) navigation of high-speed side, selection the 1 operation mode (mixed mode).Under the 1st operation mode, provided by the 1st fuel gas feeding pipe 14 to sustainer 12 The boil-off gas compressed through high-pressure compressor 13, meanwhile, provide insufficient section by the 2nd fuel gas feeding pipe 21 Fuel.That is, under the 1st operation mode, transfer tube 22, high pressure liquid pump 24 and gas heater 25 are with out of cargo tank 11 Liquefied gas generates gases at high pressure, it is carried to sustainer 12 jointly with the boil-off gas compressed from high-pressure compressor 13 For.
Under the 1st operation mode, the 1st controller 17 controls the 1st valve 16V of high-pressure compressor 13, so that cargo tank The measured pressure value PV2 of 11 sides becomes the pressure SP2 set by operating personnel.Also, the 2nd controller 28 monitoring high pressure liquid pump 24 Discharge side pressure value P V3 and driving to high pressure liquid pump 24 be controlled so that the discharge of the 2nd fuel gas feeding pipe 21 Pressure becomes (aftermentioned) pressure according to determined by the fuel gas requirement pressure SP1 or speed setting value SN of sustainer 12 Power.
In addition, under liquefied gas loading condition, when in benchmark operation point or the region than benchmark operation point low speed side When (region of running slowly) is navigated by water, the 2nd operation mode (compressor mode) is selected, using only utilization high-pressure compressor 13 1st fuel gas feeding pipe 14.That is, the operating of sustainer 12 is carried out using only boil-off gas, there are residual gas In the case of, by branch line 15 gas is provided to BOG processing units (boiler, gas combustion apparatus, reliquefaction installation etc.).
Under the 2nd operation mode, the pressure value P V1 of the 1st controller 17 monitoring discharge side simultaneously controls high-pressure compressor 13 the 1st valve 16V, so that the discharge pressure of the 1st fuel gas feeding pipe 14 becomes the combustion of (aftermentioned) according to sustainer 12 Expect pressure determined by demand pressure SP1 or speed setting value SN.
In addition, in navigation when liquefied gas is unloaded, when carrying out spray operation, time per unit that spray operation produces Boil-off gas amount according to spray operation used in liquid amount and change up and down.Therefore, than based on spray operation The region of benchmark operation point high-speed side, selection during the spray that the fuel consumption of boil-off gas yield and sustainer 12 balances 1st operation mode (mixed mode), spray when benchmark operation point or than spray when benchmark operation point low speed side neck Domain, selects the 2nd operation mode (compressor mode).That is, according to the fuel consumption of low-speed diesel engine and boil-off gas yield Relation select the 1st or the 2nd operation mode in any one.
In addition, when the boil-off gas scale of construction caused by spray operation exceedes disappearing for sustainer 12 and generator engine During consumption, remaining gas is provided to BOG processing units (boiler, gas combustion apparatus, reliquefaction installation etc.) by branch line 15 Body.Although in addition, be the navigation when liquefied gas is unloaded, in order to liquefied gas is used as the ejecting liquid of cargo tank cooling, And the fuel as sustainer, also stores some liquefied gas, not makes whole cargo tank 11 completely vacant.
In navigation when liquefied gas is unloaded, when without spraying operation, the 3rd operation mode (pump pattern) is selected, only By the 2nd fuel gas feeding pipe 21 fuel gas is provided to sustainer 12.That is, using pump 22, high pressure liquid pump 24 and Gas heater 25 produces gases at high pressure with the liquefied gas out of cargo tank 11 and is provided to sustainer 12.Also, without using 1st fuel gas feeding pipe 14, closes high-pressure compressor 13.
In the 3rd operation mode, when 1 operation mode in the same manner as, the discharge of the 2nd controller 28 monitoring high pressure liquid pump 24 Side pressure value PV3 and driving to high pressure liquid pump 24 is controlled so that the discharge pressure of the 2nd fuel gas feeding pipe 21 into For (aftermentioned) according to determined by the fuel gas requirement pressure SP1 or speed setting value SN of sustainer 12 pressure.Moreover, In the 3rd operation mode, when needing with than minimum capacity (minimum speed of motor 26) operated of high pressure liquid pump 24 In the case that the low quantity delivered of fuel gas quantity delivered provides fuel gas to sustainer 12, the 2nd controller 28 is to high pressure liquid 24 minimum capacity that can operate of pump is driven, meanwhile, the 2nd valve 29V is opened, makes the residual fuel discharged from high pressure liquid pump 24 Flowed back by the 2nd circulation line 29 to suction cylinder 23.
In addition, by the cruise speed set of ship benchmark operation point or than lower slightly speed.That is, since ship is big Part-time is navigated by water with cruising speed, therefore is for example operated near benchmark operation point.Therefore, when liquefied gas loads, substantially High-pressure compressor 13 is only driven, the fuel mostly as sustainer 12 of boil-off gas is consumed.Also, only needing In the case of the operating for carrying out high rotational speed region, high pressure liquid pump 24 is driven directly to produce gases at high pressure from liquefied gas.Separately Outside, it is most of using the due in most of the time and without spraying operation in the navigation when liquefied gas is unloaded The navigation mode of 3 operation modes, inoperative high-pressure compressor 13, fuel gas is provided using high pressure liquid pump 24.It is another Aspect, in the case where carrying out spray operation, produce boil-off gas, drives high-pressure compressor 13, boil-off gas is substantially complete Portion is utilized as the fuel of sustainer 12.
In the following, with reference to the block diagram of figure 2, the composition of the 1st, the 2nd controller 17,28 is illustrated.In addition, both structures Into identical in the scope shown in Fig. 2.
Fuel gas requirement pressure SP1 and sustainer speed setting value SN is inputted to the 1st, the 2nd controller 17,28.This In, fuel gas requirement pressure SP1 is the value required by Main Engine Control Unit 20, such as based on to carry out invariablenes turning speed control The Ran Liao Gong Give amounts (fuel index) that the sustainer 12 of the Main Engine Control Unit 20 of system provides calculate engine loading, Determined (SP1) with reference to the engine loading calculated and given curve map as shown in Figure 3 or relational expression.It is in addition, main Engine speed setting value SN is the value inputted based on operator to Main Engine Control Unit 20, in Main Engine Control Unit The tachometer value of the sustainer set in 20 after calculation, Main Engine Control Unit 20 is so that the invariablenes turning speed of sustainer 12 is The mode of this rotating speed controls Ran Liao Gong Give amounts.In addition, in fig. 2, the pressure inputted to the 1st, the 2nd controller 17,28 is represented with PV Power measured value PV1, PV2, PV3.
In figure 3, transverse axis is engine loading (%), and the longitudinal axis is the fuel gas requirement pressure (MPa) of sustainer 12. In Main Engine Control Unit 20, curves of the fuel gas requirement pressure SP1 according to Fig. 3, the load with sustainer 12 Change and change.
In the 1st, the 2nd controller 17,28, according to the value of the sustainer speed setting value SN of input, based on sustainer Substantially proportional to 3 powers of the rotating speed of the sustainer propeller law of load calculate engine loading, reference function 17A Sustainer speed setting value SN is converted to the fuel gas requirement pressure SP0 of sustainer inlet.Function 17A is equal to Curve in Fig. 3, after determining engine loading (%), the requirement pressure (longitudinal axis) of fuel gas is obtained according to curve S.
The fuel gas requirement pressure SP1 inputted to the 1st, the 2nd controller 17,28 and ginseng are inputted to switching switch 17B The pressure SP0 that function 17A is calculated is examined, is appointed in pressure controller 17C inputs both SP1, SP0 to fuel gas feed system The signal of one side.Pressure instruction values (SP0 or SP1) of the pressure controller 17C based on measured pressure value PV and input, for example, it is right The operating system system output operating quantity MV of valve 16V, 29V, inverter 27 etc. is simultaneously controlled, so that measurement pressure PV becomes pressure Command value.
Here, the switching of switching switch 17B is consistent with the change of sustainer speed setting value SN, such as autonomous according to coming The instruction of engine control system 20 and carry out.That is, switching switch 17B is usually inputted to pressure controller 17C to be started according to master The pressure SP0 that machine speed setting value SN is obtained, when sustainer speed setting value SN is changed, is changed until engine speed For the transition period untill the rotating speed after change, the pressure instruction value inputted to pressure controller 17C is switched to fuel gas It is required that pressure SP1.In addition, after during transition, inputted again to pressure controller 17C according to new speed setting value SN The pressure SP0 obtained.
As described above, composition according to the present embodiment, as long as operator does not switch the speed setting value of sustainer, then The pressure instruction value sent to pressure controller is constant, since the load change not be subject to underway sustainer is influenced, Therefore gaseous fuel can be provided to sustainer with stable pressure.
In the following, with reference to figure 4, Fig. 5, to present embodiment the 1st, the 2nd variation illustrates.The 1st shown in Fig. 4 becomes The fuel gas feed system 10 ' of shape example, is to remove to supply using the 2nd fuel gas of high pressure liquid pump 24 from the embodiment of Fig. 1 Give pipeline 21 the relevant fuel for forming, being only made of the 1st fuel gas feeding pipe 14 using high-pressure compressor 13 Gas supply system.In addition, the fuel gas feed system 10 " of the 2nd variation shown in Fig. 5, is gone from the embodiment of Fig. 1 Except the 14 relevant composition of the 1st fuel gas feeding pipe using high-pressure compressor 13, only by using high pressure liquid pump 24 The fuel gas feed system that 2nd fuel gas feeding pipe 21 is formed.1st, other compositions of the 2nd variation are and embodiment party Formula is identical.
In the 1st, the 2nd variation, as embodiment, also fuel can be provided with stable pressure to sustainer Gas.
In addition, although in the present embodiment, the transition period when engine speed changes, pressure instruction value is switched For fuel gas requirement pressure, but can not also requirement pressure, and be configured to make pressure instruction value continuous during transition Ground gently postpones to be changed to the value after change, or is configured to be changed to change according to stage the step of presetting Value afterwards.In addition, switching during be not limited to transition period, can than it is longer, also can be slightly shorter.Moreover, the end of transition period, It can be detected according to the engine speed of actual measurement, the time can also be preset.
In addition, sustainer can be special combustion gas low-speed diesel engine but it is also possible to be also burning fuel oil 2 First fuel combustion low-speed diesel engine, in the case, such as can be used as additional fuel in high rotational speed region by the use of fuel oil.Separately Outside, although in the present embodiment carrying out the liquefied gas carrier transported using methane as the LNG of main component as object Record, but the liquefied gas carrier for transporting the cargo in addition to LNG can also be applied.According to use fuel gas (such as Ethane etc.) character, the gas pressure of the motor inlet required by low-speed diesel engine is different, although exist need than will LNG be used as fuel situation higher pressure (such as 40MPa-60MPa) situation, but with the implementation using methane as main component Mode is the same also to be applied.Moreover, liquefied gas carrier is also not necessarily limited to, as long as liquefied gas is used as to the ship of main engine fuel Oceangoing ship.
Symbol description
10 fuel gas feed systems
11 cargo tanks
12 sustainers
13 high-pressure compressors
13A low-pressure stages
13B final levels
14 the 1st fuel gas feeding pipes
16 the 1st circulation lines
The 1st valves of 16V
17 the 1st controllers
17A functions
17B switching switches
17C pressure controllers
18th, 19,30 pressure sensor
20 Main Engine Control Units
21 the 2nd fuel gas feeding pipes
22 pumps
23 suction cylinders
24 high pressure liquid pumps
25 gas heaters
28 the 2nd controllers
29 the 2nd circulation lines
The 2nd valves of 29V

Claims (9)

1. a kind of fuel gas feed system, it is used for ship, and the fuel gas feed system is to the energy for being used as sustainer The low-speed diesel engine for enough carrying out gas burning provides fuel gas, which is characterized in that possessing：
The gas feed unit of fuel gas is provided to the sustainer；And
The pressure control unit of the supply pressure of the fuel gas provided to the sustainer is provided,
Speed setting value of the pressure control unit based on the sustainer sets the supply pressure.
2. fuel gas feed system according to claim 1, it is characterised in that
When the speed setting value changes, the pressure control unit is not based on the speed setting value and sets the supply Pressure.
3. fuel gas feed system according to claim 2, it is characterised in that
It is not based on the speed setting value and corresponds to during setting the supply pressure and turn with the sustainer The transition period of the conversion of speed.
4. fuel gas feed system according to claim 3, it is characterised in that
In the transition period, the pressure control unit by from based on the supply pressure that speed setting value before changing is set to The change of supply pressure based on the speed setting value setting after change is postponed.
5. fuel gas feed system according to claim 3, it is characterised in that
In the transition period, the supply pressure is set as the requirement pressure of the sustainer.
6. fuel gas feed system according to any one of claim 1 to 5, it is characterised in that
The fuel gas is the boil-off gas in cargo tank.
7. fuel gas feed system according to any one of claim 1 to 6, it is characterised in that
The gas feed unit, which possesses, compresses the gases at high pressure that the fuel gas is compressed and provided to the sustainer Machine, the pressure control unit control the discharge pressure of the high-pressure compressor to control the supply pressure.
8. fuel gas feed system according to any one of claim 1 to 7, it is characterised in that
The gas feed unit possesses the height for pressurizeing and be used as the fuel gas to be provided to the sustainer liquefied gas Squeeze pump, the pressure control unit control the discharge pressure of the high pressure liquid pump to control the supply pressure.
A kind of 9. ship, it is characterised in that
Possesses fuel gas feed system described in any item of the claim 1 to 8.
CN201680040371.XA 2015-07-17 2016-07-06 Ship fuel gas feed system Pending CN108026865A (en)

Applications Claiming Priority (3)

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JP2015142949A JP6521444B2 (en) 2015-07-17 2015-07-17 Fuel gas supply system for ships
JP2015-142949 2015-07-17
PCT/JP2016/070053 WO2017014052A1 (en) 2015-07-17 2016-07-06 Fuel gas supply system for ship

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WO (1) WO2017014052A1 (en)

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CN112413393A (en) * 2020-10-30 2021-02-26 沪东中华造船(集团)有限公司 Automatic control method and system for pressure of liquefied natural gas storage tank of LNG ship

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JP6882859B2 (en) * 2016-07-05 2021-06-02 川崎重工業株式会社 Flight management system
JP6867887B2 (en) 2017-06-06 2021-05-12 川崎重工業株式会社 Gas leak detection system and gas leak detection method
WO2022084570A1 (en) * 2020-10-20 2022-04-28 Wärtsilä Finland Oy Method and apparatus for automated boil-off gas (bog) management of marine vessel

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CN112413393A (en) * 2020-10-30 2021-02-26 沪东中华造船(集团)有限公司 Automatic control method and system for pressure of liquefied natural gas storage tank of LNG ship

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