CN108883818A - Liquefied gas carry vessel - Google Patents

Liquefied gas carry vessel Download PDF

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Publication number
CN108883818A
CN108883818A CN201780016962.8A CN201780016962A CN108883818A CN 108883818 A CN108883818 A CN 108883818A CN 201780016962 A CN201780016962 A CN 201780016962A CN 108883818 A CN108883818 A CN 108883818A
Authority
CN
China
Prior art keywords
gas
engine
fuel gas
storage tank
fuel
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
CN201780016962.8A
Other languages
Chinese (zh)
Inventor
安藤明洋
田本英司
武田宏之
青木纪
青木一纪
小谷野薰
安部崇嗣
成岛直树
桥本大
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.)
Kawasaki Motors Ltd
Original Assignee
Kawasaki Jukogyo KK
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 Kawasaki Jukogyo KK filed Critical Kawasaki Jukogyo KK
Publication of CN108883818A publication Critical patent/CN108883818A/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
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • 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
    • B63J3/00—Driving of auxiliaries
    • B63J3/04—Driving of auxiliaries from power plant other than propulsion power plant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • F17C13/02—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
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • 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
    • 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
    • F17C2205/0323—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
    • 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
    • F17C2205/0382—Constructional details of valves, regulators
    • 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
    • F17C2227/0157—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
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • 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

A kind of liquefied gas carry vessel, has：The storage tank of store liquefied gas body；Compressor；The engine of energy combustion gas；Gasifying gas in storage tank is guided to the gasifying gas pipeline of compressor；The fuel gas that compressor spues is guided to the fuel gas feeding pipe of engine；The fuel gas of fuel gas feeding pipe is guided to the foldback pipeline of the liquid phase to storage tank；It is set to the foldback valve of foldback pipeline；And control device.Control device is so that the pressure of fuel gas is in the discharge-amount of the form control compressor in the requirement pressure limit of engine, and monitor the reduction of the load of engine, and when determining that engine load reduces so that and engine consumption gas flow and flowed into from storage tank gasifying gas pipeline gasifying gas amount the substantial a considerable amount of difference fuel gas be returned to by foldback pipeline storage tank form control foldback valve aperture.

Description

Liquefied gas carry vessel
Technical field
The present invention relates to the fuel gas feed system of the engine of energy combustion gas and the liquefied gas carryings for loading them Ship.
Background technique
Conventionally, there is known for transporting liquefied natural gas（Hereinafter referred to as " LNG "）The liquefied gas of equal liquefied gas is carried Ship.In liquefied gas carry vessel, some is mounted with the internal combustion engine of energy combustion gas, and is formed as using in the storage tank for accumulating liquefied gas Structure of the liquefied gas of gasification as the fuel gas of internal combustion engine.
For example, liquefied gas carry vessel described in Patent Document 1 is in order to generate the electric device for ship and be used for Propelling ship supplies electric power, and has the power generating unit including the diesel engine for driving alternating current generator, and make With the gasifying gas of the liquefied gas of stowage（Boil-off gas；Boil-Off Gas）Fuel as the diesel engine.The gas Change gas continuously to be sucked compressor and spued to manifold.The manifold connects the entrance of power generating unit, from manifold to energy Generation unit supplies fuel gas（I.e. compressed gasifying gas）.In addition, being connected on the manifold for excess pressure to be discharged Pipeline, extra fuel gas guided by the pipeline to incinerator.
It is described in above patent document 1 in storage tank full load, depending on the heat exchange conditions with outside, it may occur that manifold Interior pressure reaches the value greater than defined high pressure, the generation of the gasifying gas based on natural evaporation becomes excessive situation. It is in order to avoid the pressure in manifold excessively rises, unburned excessive fuel gas is raw by energy under situation as above It guides at unit to incinerator and is burned.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2005-324789 bulletin.
Summary of the invention
Problems to be solved by the invention：
In the structure for the liquefied gas carry vessel that above patent document 1 is recorded, it is incinerated the excessive fuel gas of furnace burning Energy is without utilizing with regard to direct emission, so the consumption of liquefied gas increases in navigation.Therefore, it in above structure, is reducing There is room for improvement in terms of the consumption of liquefied gas in navigation.
In view of the foregoing, it is an object of the invention in the gasifying gas for being mounted with the liquefied gas that will be generated in storage tank In the liquefied gas carry vessel of the engine of the energy combustion gas used as fuel, the consumption of liquefied gas in navigation is reduced.
The means solved the problems, such as：
The liquefied gas carry vessel of a form of the invention, has：
The storage tank of store liquefied gas body；
The variable compressor of discharge-amount；
The engine of energy combustion gas；
The gasifying gas generated in the storage tank is guided to the gasifying gas pipeline of the compressor；
Fuel gas is guided to the fuel gas feeding pipe of the engine, the fuel gas is by including the gasification gas The gas of body is formed through the compressor compresses；
Detect the fuel gas pressure meter of the pressure of the fuel gas in the fuel gas feeding pipe；
It is connect with the fuel gas feeding pipe and will be in part or all of guidance to the storage tank of the fuel gas Liquid phase foldback pipeline；
It is set to the variable foldback valve of the foldback pipeline and aperture；And
Control device, the control device is so that the pressure that the fuel gas pressure measures is in the requirement of the engine The discharge-amount of compressor described in form control in pressure limit, and the reduction of the load of the engine is monitored, and determining When the engine load reduces, so as to consume gas flow with engine and flow into the gasifying gas pipeline from the storage tank The fuel gas of the substantial a considerable amount of the difference of the amount of the gasifying gas is returned to the storage by the foldback pipeline The form of tank controls the aperture of the foldback valve.
According to the liquefied gas carry vessel of above structure, fuel gas is returned to storage tank when engine load reduces Liquid phase.The pressure of fuel gas feeding pipe is reduced because of the foldback of fuel gas, therefore the discharge-amount of compressor increases.By This, the pressure of fuel gas feeding pipe maintains in the requirement pressure limit of engine, and flows into the gas of gasifying gas pipeline The flow for changing gas increases, therefore the rising of reservoir gas pressure is inhibited.Also, even if occurring to flow into gasifying gas pipeline The amount of gasifying gas is more than the situation of engine consumption gas flow, can also be by the excessive fuel gas of fuel gas feeding pipe It is returned to storage tank, and is utilized the fuel gas as LNG or gasifying gas again.Herein, since fuel gas is to be returned to The liquid phase of storage tank, therefore, because foldback fuel gas caused by the rising of reservoir gas pressure inhibited.As described above, energy Enough while inhibiting reservoir gas pressure to rise, by the way that fuel gas to storage tank foldback, is thus reduced liquefied gas in navigation The consumption of body.
In above-mentioned liquefied gas carry vessel, it is generally desirable to which the control device is formed as that the gasifying gas pipeline will be flowed into Amount and the engine consumption gas flow of the gasifying gas be compared, be more than the hair in the amount of the gasifying gas When motivation consumes gas flow, the structure that the engine load reduces is determined.Herein, it is also possible to the control device to be formed as The operating quantity of manipulation device based on the liquefied gas carry vessel finds out the structure of engine consumption gas flow.
Between the load of manipulation device to engine practical reduced time point, there are time lags.Therefore, according to Above structure can make reducing prior to engine load to the foldback amount of storage tank for the fuel gas of fuel gas feeding pipe Time point and increase.
Preferably above-mentioned liquefied gas carry vessel is also equipped with：Detect the gasifying gas pressure of the pressure of gas phase in the storage tank Power meter；
Burn the gas combustion apparatus of the fuel gas；
Connect the gas exhaust piping of the fuel gas feeding pipe and the gas combustion apparatus；And
It is set to the exhaust valve of the gas exhaust piping；
The pressure that the control device is formed as measuring in the gasifying gas pressure gauge is more than that defined pressure of storage tank allows model When enclosing, to increase the form control of the amount guided by the gas exhaust piping to the fuel gas of the gas combustion apparatus The aperture of the exhaust valve, and in the form of the increase of the aperture with the exhaust valve accordingly reduces the aperture of the foldback valve Control the structure of the aperture of the foldback valve.
According to above structure, when gasifying gas pressure is more than pressure of storage tank allowed band, by fuel gas feeding pipe A part of extra fuel gas send to gas combustion apparatus and carry out burning disposal, and by one of extra fuel gas Divide the liquid phase part for being returned to storage tank.Thereby, the pressure reduction of fuel gas feeding pipe, therefore the discharge-amount of compressor increases Add.The flow for flowing into the gasifying gas of gasifying gas pipeline increases because of the increase of the discharge-amount of compressor, as a result, inhibiting The rising of reservoir gas pressure.
It can be above-mentioned liquefied gas carry vessel to be also equipped with：The liquefied gas in the storage tank is guided to the pressure The forced gasification gas piping of contracting machine；
It is set to the gasifier of the forced gasification gas piping；And
It is set to the pressure of the forced gasification gas piping and the flow of the liquefied gas of the control inflow gasifier Gasification valve；
The control device is formed as when determining that the engine load is reduced with forced gasification described in the form control shut down The structure of valve.
Thereby, when determining that engine load reduces, stop the supply of forced gasification gas and preferentially by the gas in storage tank Change gas to send to compressor, so as to extract more gasifying gas out out of storage tank.
Can be in above-mentioned liquefied gas carry vessel, the midway of the fuel gas feeding pipe be provided with have than The gas collectors of the big flow path cross sectional area of other parts are connected with the foldback pipeline in the gas collectors.It can be by the gas The volume of body collector absorbs the variation of fuel gas pressure.
It can be above-mentioned liquefied gas carry vessel to have：Generator unit, the generator unit have multiple groups described in engine, And the generator of electric power is obtained from the mechanical energy that the engine exports；
Propulsion unit, the propulsion unit have by electric power that the generator unit generates electricity the propulsion motor driven, And the propeller rotated by the output of the propulsion motor；With
It is described to be set to the electric power from the generator unit to the propulsion unit with electric control unit with electric control unit Feed system carries out distribution to the electric power that the generator unit generates electricity, and controls the output of the propulsion motor.
In the liquefied gas carry vessel of above structure, driven by electric power that the mechanical energy exported with engine generates electricity Dynamic propulsion unit.Therefore, load change of the load of engine prior to propulsion unit can be made and changed, so as to guard against reality Propulsion unit load variation.
Invention effect：
According to the present invention, the energy combustion gas used in the gasifying gas for being mounted with the liquefied gas that will be generated in storage tank as fuel In the liquefied gas carry vessel of engine, the consumption of liquefied gas in navigation can be reduced.
Detailed description of the invention
Fig. 1 is the schematic structural diagram of the propulsion system of the liquefied gas carry vessel of an implementation form of the invention；
Fig. 2 is the schematic structural diagram of the fuel gas feed system of liquefied gas carry vessel；
Fig. 3 is the block diagram for showing the structure of control system of fuel gas feed system；
Fig. 4 is the flow chart for showing the process of control of fuel gas feed system.
Specific embodiment
Hereinafter, being described with reference to the LNG carry vessel of the liquefied gas carry vessel as an implementation form of the invention.Fig. 1 Show the schematic structural diagram of the propulsion system 90 of the LNG carry vessel 1 of an implementation form of the invention.LNG carry vessel shown in Fig. 11 In, propulsion system 90 uses DFD（Binary fuel diesel engine）It is electrically propelled mode.But the LNG carry vessel that the present invention is applicable in 1 is not limited to this implementation form, as long as having the engine for the energy combustion gas that can use gas as fuel.
The propulsion system 90 of LNG carry vessel 1 has generator unit 91, generated electricity being driven by electricity of obtaining by generator unit 91 Propulsion unit 93 and be set to from generator unit 91 to the electric power supply system of propulsion unit 93 with electric control unit 92。
Engine 2 and generator 912 in generator unit 91 containing multiple groups power generation etc..Generator 912 produces engine 2 It is electric power that raw mechanical energy, which is taken out,.
In propulsion unit 93 containing at least one propulsion motor 931, by propulsion motor 931 output driving propulsion Device 933 and the speed reducer 932 etc. being set on from propulsion motor 931 to the power transfer path of propeller 933.Match Distribution board 921 and control propulsion motor 931 containing electric power of the distribution from generator unit 91 in electric control unit 92 Output（That is revolving speed）Frequency converter（inverter）922 etc..However, it can be the revolving speed of propulsion motor 931 be it is certain, lead to It crosses and pitch is changed using variablepiston propeller to adjust propulsive force.
For example not shown telegraph lever of the revolving speed of propulsion motor 931（Telegraph lever）Equal manipulation devices Operating quantity determined, supplied from electric control unit 92 to pushing away with the comparable electric power of electrical power demand value for corresponding to the revolving speed Into unit 93.Such that generator unit 91 generates electricity, obtained electric power is capable of providing electric power in addition to propulsion unit 93 uses, also There is the form for the electric power that equipment etc. uses in subsidiary engine and ship, the fuel of amount corresponding with generated energy is supplied to generator unit 91.
In the propulsion system 90 of above structure, the engine 2 of this implementation form is the binary for capableing of combustion oil and gas Four circulation diesel engines of fuel mode.Therefore, into the fuel feed system of engine 2 containing the supply combustion of oriented engine 2 Expect the fuel gas feed system 96 of gas and supplies the combustion of the fuel oil such as the heavy oil for being stored in fuel oil service tank 95 to engine 2 Expect oily feed system 97.In addition, showing fuel gas feed system 96 in Fig. 1 with dotted arrow, fuel is shown with solid arrow Oily feed system 97.Fuel gas feed system 96 is made of fuel gas feed system 10, the fuel gas feed system 10 by gas obtained by the LNG spontaneous vaporization in the storage tank 3 of LNG conveying（Hereinafter referred to as " NBOG "）And/or in storage tank 3 LNG is by forced gasification gas obtained by forced gasification（Hereinafter referred to as " FBOG "）It supplies to engine 2.Hereinafter, being described in detail Fuel gas feed system 10.
Fig. 2 is the figure for showing the outline structure of fuel gas feed system 10 of this implementation form.Fuel gas shown in Fig. 2 Feed system 10 substantially has：Save as the storage tank 3 of the LNG of liquefied gas；The variable compressor 4 of discharge-amount；It will be in storage tank 3 The NBOG of generation is guided to the gasifying gas pipeline 41 of compressor 4；Fuel gas is guided to the fuel gas supply of engine 2 Pipeline 42, the fuel gas are compressed by the gas comprising NBOG through compressor 4；And management fuel gas feed system The control device 7 of 10 movement.
The storage tank 3 of multiple large sizes along the arrangement of captain direction is provided on LNG carry vessel 1, Fig. 2 shows therein four It is a.Storage tank 3 has can remain LNG under atmospheric pressure in the form of about -162 DEG C of liquid condition and is able to maintain extremely low temperature state Heat-insulating property.In storage tank 3, liquid phase part 3a is constituted by the liquid level downside of the LNG accommodated, same upside constitutes gas phase There is the gas comprising NBOG in part 3b, gas phase portion 3b.The liquid surface level of LNG in detection storage tank 3 is provided on storage tank 3 Liquidometer 32.
In LNG carry vessel 1, it is however generally that, when to gas consumption being navigated by water from the gas place of production and from gas consumption to gas When the body place of production is navigated by water, the ratio of liquid phase part 3a and gas phase portion 3b in storage tank 3 are different.For example, in LNG carry vessel 1 from gas When the body place of production to gas consumption is navigated by water, LNG is filled in storage tank 3.For example, the liquid phase part 3a of LNG is enabled to account for the pact of tank capacity 98.5% or more state is " fully loaded ".When LNG carry vessel 1 from gas consumption is navigated by water to the gas place of production, accommodated in storage tank 3 There is a small amount of LNG.For example, enabling about 1.5% state below that the liquid phase part 3a of LNG is tank capacity is " zero load ".In addition, In the navigation of LNG carry vessel 1, the ratio regular meeting of liquid phase part 3a and gas phase portion 3b slightly become due to LNG evaporates in storage tank 3 It is dynamic.
Gasifying gas pipeline 41 is by the gas suction inlet 41a for being opened on the top of storage tank 3 to be connected with the entrance of compressor 4 At least one piping etc. constitute.NBOG in storage tank 3 is guided by the gasifying gas pipeline 41 to compressor 4.This implementation shape In state, the gasifying gas pipeline 41 connecting with each storage tank 3 passes through vapor gas collector（Vapor gas header）41b combined into One, in the downstream side of the vapor gas collector 41b of gasifying gas pipeline 41, the LNG flowed out from each storage tank 3 converges and flows to compression Machine 4.Gasifying gas pressure gauge 72 is provided on vapor gas collector 41b.The gasifying gas pressure gauge 72 detection is flowed from each storage tank 3 LNG out（Gasifying gas）Pressure（Hereinafter referred to as " gasifying gas pressure P2 "）.Vapor gas collector 41b and each storage tank 3 connect It connects, therefore the gasifying gas pressure P2 that measures of gasifying gas pressure gauge 72 is substantially equal to the gas pressure in each storage tank 3（Have below When be also referred to as " reservoir gas pressure "）.In addition, although not shown, but leaned in the vapor gas collector 41b compared with gasifying gas pipeline 41 Downstream side is provided with the gas-cooled forecooler that will be flowed into compressor 4（Pre-cooler）, from what is flowed into compressor 4 Dewatered mist separator in gas（Mist separator）Deng.
It is connected on gasifying gas pipeline 41 and guides the LNG in storage tank 3 to the forced gasification gas piping 51 of compressor 4 Downstream.Be provided on forced gasification gas piping 51 pump 31, the gasifier 52 for the liquid phase part 3a being configured in storage tank 3 with And control flows into the forced gasification valve 53 of the flow of the LNG of gasifier 52, they pass through the connection such as piping.The forced gasification gas In pipeline 51, by the operating of pump 31 by the LNG force feed in storage tank 3 to gasifier 52, and by gasifier 52 to LNG forced gasification Made of FBOG send to compressor 4.
The aperture of forced gasification valve 53 is controlled by control device 7.Change stream by changing the aperture of forced gasification valve 53 Enter the amount of the FBOG of gasifier 52（Hereinafter referred to as " forced gasification gas flow "）.In addition, the forced gasification gas of this implementation form In pipeline 51, change forced gasification gas flow by changing the aperture of forced gasification valve 53, however, not limited to this, for example may be used Change forced gasification gas flow to pump 31 revolving speed by change.
Compressor 4 is by the device of the gas downstream force feed derived from upstream side.The NBOG sucked by compressor 4 And/or FBOG spues through compression and to fuel gas feeding pipe 42.Engine 2 using NBOG compressed like this and/or FBOG is as fuel gas.The compressor 4 of this implementation form is low-load compressor（Low duty compressor）, such as Be formed as the requirement pressure i.e. 500KPa that the gas in atmospheric pressure is sucked, boosted to engine 2（≒5bar）It controls and spits Structure out.The compressor 4 of this implementation form is such as axial-flow type or centrifugal compressor, is formed as by adjusting suction inlet Opening degree and/or motor revolving speed to making discharge-amount（Or soakage）Variable structure.The discharge-amount of compressor 4（Or it inhales Enter amount）It is controlled by control device 7.
Fuel gas feeding pipe 42 by at least one that is connected the discharge opening of compressor 4 with the entrance of engine 2 with On piping etc. constitute.The gas collection with the flow path cross sectional area greater than other parts is provided on fuel gas feeding pipe 42 Pipe 42a.Gas collectors 42a has the function of bifurcated pipe, and fuel gas feeding pipe 42 is in the downstream side of gas collectors 42a point It pitches and connects multiple engines 2.In addition, illustrating only one in multiple engines 2 in Fig. 2.It is provided on gas collectors 42a For measuring the gas pressure of fuel gas feeding pipe 42（Hereinafter referred to as " fuel gas pressure P1 "）Fuel gas pressure Meter 71.
It is connected on fuel gas feeding pipe 42 by the fuel gas of fuel gas feeding pipe 42 to 3 foldback of storage tank Foldback pipeline 61.The upstream end of the foldback pipeline 61 of this implementation form connects gas collectors 42a.The downstream 63 of foldback pipeline 61 Liquid phase part 3a in storage tank 3.In addition, foldback pipeline 61 is connect with each storage tank 3 in this implementation form, and be formed as from Fuel gas feeding pipe 42 is to the structure of each 3 foldback fuel gas of storage tank, however foldback pipeline 61 is formed as to multiple storages The structure of at least one foldback fuel gas in tank 3.
So that the form that the flow path cross sectional area of foldback pipeline 61 can be changed is provided with the variable foldback of aperture on foldback pipeline 61 Valve 62.The aperture of foldback valve 62 is controlled, by control device 7 so as to control through foldback pipeline 61 to 3 foldback of storage tank The flow of fuel gas, and adjust the fuel gas pressure of the fuel gas feeding pipe 42 as the upstream side of foldback valve 62 P1。
In addition, fuel gas feeding pipe 42 connects oriented gas combustion apparatus（GCU；Gas Combustion Unit） The gas exhaust piping 81 of 83 guidance gases.The upstream end of the gas exhaust piping 81 of this implementation form connects gas collectors 42a.Gas burning The burning of device 83 passes through the gas that gas exhaust piping 81 imports from fuel gas feeding pipe 42, and arranges to the external of LNG carry vessel 1 Gas.Exhaust valve 82 is provided on gas exhaust piping 81.By controlling the aperture of exhaust valve 82, thus, it is possible to adjust gasifying gas pressure P2（That is reservoir gas pressure）.
The computer that control device 7 is known as has the storage units such as arithmetic processing sections and ROM, RAM such as CPU（? It is not shown）.The program and various fixed datas etc. of arithmetic processing section execution are stored in storage unit.Arithmetic processing section carry out with The data transmit-receive of external device (ED).Also, arithmetic processing section carry out from various instrument detection signal input and to it is each control pair The output of the control signal of elephant.In control device 7, is read by arithmetic processing section and execute the program for being stored in storage unit etc. and is soft Part carries out the processing of the movement for controlling fuel gas feed system 10.In addition, control device 7 can be by based on single The centralized control of one computer executes each processing, is also possible to by being held based on the decentralised control of the cooperation of multiple computers Each processing of row.
Fig. 3 is the block diagram for showing the structure of control system of fuel gas feed system 10.In the figure, especially, show For controlling the structure of fuel gas pressure P1 and the gas pressure P2 that gasifies, and the structure of other controls is omitted.Such as Fig. 3 institute Show, these each instrument input detection letters from fuel gas pressure meter 71, gasifying gas pressure gauge 72 and liquidometer 32 of control device 7 Number, and operating quantity signal is inputted from telegraph lever 80.Telegraph lever 80 is the operating unit for manipulating LNG carry vessel 1, and Become corresponding by the operating quantity signal of the telegraph levers such as advance, retrogressing, full speed, Half Speed, low speed, dead slow speed, stopping 80 or with them The signal of relationship directly or indirectly input control device 7.
Also, control device 7 has the compressor control portion 75 of the discharge-amount of control compressor 4, control forced gasification valve 53 Aperture forced gasification valve control unit 76, control foldback valve 62 aperture foldback valve control unit 77 and control exhaust valve These each function parts of the exhaust valve control unit 78 of 82 aperture.Also, from control device 7 to compressor 4, forced gasification valve 53, Foldback valve 62 and the output control signal of exhaust valve 82.
In the fuel gas feed system 10 of above structure, supplies to the gas pressure of the fuel gas of engine 2 and fall In the gas pressure claimed range of engine 2.In the implementation form, fuel gas pressure P1 control is maintained at hair Fuel gas in the gas pressure claimed range of motivation 2 sets pressure Ps1.Herein, fuel gas setting pressure Ps1 is to start The value of the centre of the upper limit value and lower limit value of the gas pressure claimed range of machine 2, herein an only example.
Also, gasifying gas pressure P2 falls in the defined storage tank until from defined downside threshold value to defined upside threshold value In pressure allowed band.Downside threshold value is such as the freezing point, tank capacity, pre- the heat input to storage tank 3 based on LNG The value first set.If gasifying gas pressure P2 is lower than downside threshold value, there are the temperature in storage tank 3 to reduce to one of LNG It is divided into point, the worry that impurity etc. freezes.On the other hand, upside threshold value is that safety system is considered for example in the design pressure of storage tank 3 Several and preset values.It is more than storage tank 3 there are gasifying gas pressure P2 if gasifying gas pressure P2 is more than upside threshold value Design allows the worry of pressure.
Therefore, control device 7 is so that fuel gas pressure P1 maintains fuel gas setting pressure Ps1 and makes gasifying gas Pressure P2 maintains the form in defined pressure of storage tank allowed band, controls the movement of fuel gas feed system 10, especially It is the movement for controlling forced gasification valve 53, compressor 4, foldback valve 62 and exhaust valve 82.
Fig. 4 is the flow chart for showing the process of control of the fuel gas feed system 10 based on control device 7.It transports below Illustrate the process of the control of exhaust valve 82 and foldback valve 62 based on control device 7 with the flow chart.
In addition, enabling the control model when control for the fuel gas feed system 10 for starting based on control device 7 is normality Control model.Under normality control model, in principle so that fuel gas pressure P1 becomes the shape of fuel gas setting pressure Ps1 The discharge-amount of formula control compressor 4.Specifically, control device 7 is so that fuel gas pressure P1 becomes fuel gas setting pressure The fuel gas pressure P1 measured feedback and control the discharge-amount of compressor 4 by the form of power Ps1.Also, being controlled in normality Under mode, in principle so that forced gasification gas flow becomes the amount of the gas sucked with compressor 4 and flows into gasification gas from storage tank 3 The amount of the NBOG of body pipeline 41（Hereinafter referred to as " NBOG amount QNBOG"）Difference a considerable amount form control forced gasification valve 53 Aperture.
As shown in figure 4, control device 7 obtains NBOG amount QNBOGGas flow Q is consumed with engineFuel（Step S1）, by they It is compared to monitor the load condition of engine 2（Step S2）.
Among the above, NBOG amount QNBOGIt is the amount that the NBOG of gasifying gas pipeline 41 is flowed into from storage tank 3.NBOG amount QNBOG? It can be merely as the yield of NBOG in storage tank 3, but more preferably to consider gasification gas in the yield of NBOG The amount of available NBOG after body pressure P2.NBOG amount QNBOGAlso measured value can be used, but use warp in this implementation form Calculate the NBOG amount Q acquiredNBOGPredicted value.By by the liquid level of LNG in storage tank 3 and to parameters such as the heat inputs of storage tank 3 For defined arithmetic expression or defined mapping graph etc., the amount of the NBOG generated in one day is thus found out and by it divided by after 24 To the yield of NBOG.That is, the yield of NBOG is the estimated amount of the NBOG generated in the unit time.In addition, among the above, storage The liquid surface level of LNG can be obtained from the detected value of liquidometer 32 for being set to storage tank 3 in tank 3, for example, distinguish full load with When unloaded.Also, the heat input to storage tank 3 is using the shape of storage tank 3, navigation period, navigation route, meteorology among the above Condition etc. at least one of the value that acquires.Gasifying gas pressure P2 is considered in the yield for the NBOG being so calculated, The flow into the unit time for the NBOG that gasifying gas pipeline 41 is sent out is calculated as NBOG amount QNBOG。
Control device 7 can read and using being pre-stored within the value of storage unit as NBOG amount QNBOG.Alternatively, control dress It sets 7 and has NBOG amount calculation function, NBOG amount Q is calculated by control device 7NBOG.In this case, in storage tank 3 LNG liquid level （Fully loaded zero load）, gasifying gas pressure P2, to the NBOG amount such as heat input of storage tank 3 QNBOGParameter can be and be stored in advance In the value of storage unit, or it is also possible to the value that the measured value of the various instrument loaded based on LNG carry vessel 1 is calculated.
Also, engine consumes gas flow Q among the aboveFuelIt is the amount for the fuel gas that engine 2 consumes.Engine disappears Gas consumption scale of construction QFuelIt can be the operating quantity for example with the telegraph lever 80 of manipulation LNG carry vessel 1（Operating position）Corresponding value. The revolving speed that propulsion motor 931 is determined by the operating quantity of telegraph lever 80, based on corresponding with the revolving speed of propulsion motor 931 Electrical power demand value determines the generated energy of generator unit 91, and the amount for the fuel gas that engine 2 consumes is determined based on generated energy.At this In implementation form, control device 7 has an engine consumption gas flow calculation function, control device 7 using defined arithmetic expression or Defined mapping graph etc. calculates engine based on the operating quantity of telegraph lever 80 and consumes gas flow QFuel, and it is calculated Engine consumes gas flow QFuel。
But engine consumes gas flow QFuelCalculation method be not limited to it is above-mentioned.For example, it can be engine consumption Gas flow QFuelFor the value for subtracting the fuel gas scale of construction for being returned to storage tank 3 by foldback pipeline 61 from the discharge-amount of compressor 4. As described above, so that fuel gas pressure P1 remains the revolving speed of certain form control compressor 4, therefore supplied to fuel gas To the amount for the fuel gas that pipeline 42 supplies（That is the discharge-amount of compressor 4）Amount for the fuel gas supplied to engine 2（I.e. Engine consumes gas flow QFuel）With the sum of the fuel gas scale of construction for being returned to storage tank 3 by foldback pipeline 61.
It is sent out as described above, the control device 7 of this implementation form is calculated based on the aperture of the revolving speed of compressor 4 or foldback valve 62 Motivation consumes gas flow QFuel, and calculated engine consumes gas flow QFuel.It however, it can be instead of as above State the engine consumption gas flow Q being calculated like thatFuel, and engine is used to consume gas flow QFuelMeasured value.In the feelings Under condition, it is also possible to that the combustion that detection flows into engine 2 for example is arranged in the entrance of fuel gas feeding pipe 42 or each engine 2 Expect at least one flowmeter of the flow of gas（Illustration omitted）, value which is obtained（Flow is calculated as more When a, aggregate value）Gas flow Q is consumed as engineFuel。
Control device 7 monitors the load condition of engine 2, in NBOG amount QNBOGGas flow Q is consumed greater than engineFuel （QNBOG> QFuel）In the case where be judged to being in（It is yes in step S2）Underload（Step S5）, other situations（It is in step S2 It is no）Under be judged to being not at underload（Step S3）.
Control device 7 is when the load condition for being determined as engine 2 is not at underload（Step S3）, maintain normality control Mode（Step S4）.
In normality control model, for foldback valve 62, in principle so that fuel gas pressure P1 is maintained fuel gas sets Its aperture of the form control of constant-pressure Ps1.It however, it can be that the foldback valve 62 for making normality control model is shut down（Opening degree 0%）.Also, for the exhaust valve 82 of normality control model, in principle to become shutting down（Opening degree 0%）Form control its aperture.
On the other hand, control device 7 is when the load condition for being determined as engine 2 is in underload（Step S5）, so that Gas flow Q is consumed with engine when 2 load reduction of engineFuelWith NBOG amount QNBOGDifference, that is, foldback gas flow QRETURN （QRETURN=QNBOG-QFuel）The fuel gas of substantial comparable flow increases foldback valve 62 to the form of 3 foldback of storage tank Aperture（Step S6）.In addition, engine when 2 load reduction of engine consumes gas flow QFuelStart for what is obtained in step S1 Machine consumes gas flow QFuel.Foldback gas flow QRETURNFor from NBOG amount QNBOGIn subtract engine consumption gas flow QFuelValue. For example, in NBOG amount QNBOGGas flow Q is consumed for 2.0ton/h, engineFuelWhen for 1.5ton/h, foldback gas flow QRETURNFor 0.5ton/h, will be with foldback gas flow QRETURNComparable fuel gas is returned to storage tank 3 from fuel gas feeding pipe 42.
The discharge characteristic of foldback valve 62 is previously stored in control device 7（The relationship of aperture and flow）.7 base of control device In the defined corresponding relationship, so that with foldback gas flow QRETURNSubstantial comparable fuel gas circulates in foldback pipeline 61 Form control foldback valve 62 aperture.It however, it can be control device 7 based on being set to the (not shown) of foldback pipeline 61 The detected value of flowmeter, so that the detected value is substantially equal to foldback gas flow QRETURNForm control foldback valve 62 aperture.
As described above, the underload of engine 2 is determined based on the operation of telegraph lever 80, to make opening for foldback valve 62 It spends the time point prior to actual 2 load reduction of engine and increases.By increasing the aperture of foldback valve 62, fuel gas supply The fuel gas of pipeline 42 increases to the foldback amount of storage tank 3.Fuel gas is returned to the liquid phase part 3a in storage tank 3, is fired The most of of material gas liquefies during rising in liquid phase part 3a and becomes LNG.Therefore, it is returned to by fuel gas The case where gas phase portion 3b, is compared, and gasifying gas pressure P2 is able to suppress（That is reservoir gas pressure）Rising.In addition, fuel gas The pressure of body feeding pipe 42 is reduced because of the foldback of fuel gas, therefore the pressure in order to maintain fuel gas, compressor 4 Discharge-amount increases.Increase the gasifying gas for flowing into gasifying gas pipeline 41 like this in order to increase the discharge-amount of compressor 4 Flow, as a result, inhibiting the rising of gasifying gas pressure P2.
Also, in NBOG amount QNBOGIt is more than engine consumption gas flow Q because of the reduction of the load of engine 2FuelWhen, it will fire The extra fuel gas of material gas feed line 42 is returned to storage tank 3 rather than gas combustion apparatus 83.Storage tank 3 will be returned to Fuel gas again acts as LNG or fuel gas.Therefore, it can cut down by the fuel gas of 83 burning disposal of gas combustion apparatus.
In addition, when determining the reduction of the load of engine 2 as described above, it is generally desirable to so that forced gasification valve 53 was shut down The form control forced gasification valve 53.Thereby, the NBOG of storage tank 3 flows into fuel gas feeding pipe 42 prior to FBOG.
Even if fuel gas extra with the formal layout for increase gasifying gas pressure P2 like this, gasifying gas pressure Power P2 still may be more than pressure of storage tank allowed band.For example, when LNG carry vessel 1 enters a port toward port discharge etc., in order to enter a port and Ship's speed is reduced so NBOG amount Q sometimesNBOGIt can be more than that engine consumes gas flow QFuel, storage tank 3 due to be full load condition therefore i.e. Make to liquid phase part 3a foldback fuel gas, gasifying gas pressure P2 can still be gradually increased.
Therefore, control device 7 obtains gasifying gas pressure P2（Step S7）, and by gasifying gas pressure P2 and defined storage The upside threshold value of pressure tank allowed band is compared（Step S8）, when gasifying gas pressure P2 is more than upside threshold value（Step It is yes in S8）The aperture of exhaust valve 82 is set to increase to defined aperture（Step S9）.In addition, control device 7 is according to exhaust valve 82 Defined aperture reduce the aperture of foldback valve 62（Step S10）.
When making the opening of exhaust valve 82 to defined aperture as described above, by part or all of extra fuel gas It send to gas combustion apparatus 83, and part or all by extra fuel gas is returned to storage tank 3.Thereby, fuel gas The pressure of feeding pipe 42 further decreases, therefore the discharge-amount of compressor 4 further increases.By so making to inhale from storage tank 3 Enter to the amount increase of the NBOG of compressor 4, can be avoided the excessive rising of gasifying gas pressure P2.Herein, it is stored up from effective use From the perspective of the LNG of tank 3, it is generally desirable to it is fallen into gasifying gas pressure P2 for condition in pressure of storage tank allowed band, so that It send the fuel gas to gas combustion apparatus 83 to become less and becomes more forms, root to the fuel gas of 3 foldback of storage tank According to the aperture of the defined aperture control foldback valve 62 of exhaust valve 82.But the fuel for being returned to storage tank 3 is reduced by then passing through Gas reduces the heat input to storage tank 3, therefore from the viewpoint of reducing to the heat input of storage tank 3, it is generally desirable to which reduction returns It send to the fuel gas of storage tank 3.
The process of the control of exhaust valve 82 and foldback valve 62 described above is with the defined control period（Such as 200msec） It repeats.
As described above, the LNG carry vessel 1 of this implementation form has：Store an exemplary LNG as liquefied gas Storage tank 3；The variable compressor 4 of discharge-amount；The engine 2 of energy combustion gas；The NBOG generated in storage tank 3 is guided to compressor 4 Gasifying gas pipeline 41；Fuel gas is guided to the fuel gas feeding pipe 42 of engine 2, the fuel gas is by wrapping Gas containing NBOG is compressed through compressor 4；Detect the fuel gas of the pressure of 42 fuel gas of fuel gas feeding pipe Body pressure gauge 71；Connect fuel gas feeding pipe 42 and by the liquid in part or all of guidance to storage tank 3 of fuel gas The foldback pipeline 61 of phase part 3a；It is set to the variable foldback valve 62 of foldback pipeline 61 and aperture；And control device 7.Also, Control device 7 is so that the pressure that fuel gas pressure meter 71 measures falls into the form control in the requirement pressure limit of engine 2 The discharge-amount of compressor 4.In addition, control device 7 monitors the reduction of the load of engine 2, and determining 2 load reduction of engine When, so as to consume gas flow Q with engineFuelWith the amount for the gasifying gas for flowing into gasifying gas pipeline 41 from storage tank 3（NBOG amount QNBOG）The substantial a considerable amount of difference（Foldback gas flow QRETURN）Fuel gas storage tank 3 is returned to by foldback pipeline 61 Form controls the aperture of foldback valve 62.
In the LNG carry vessel 1 of above structure, engine 2 load reduction, flow into gasifying gas pipeline 41 gasification gas The amount of body（NBOG amount QNBOG）Gas flow Q is consumed more than engineFuelWhen, the excessive fuel gas of fuel gas feeding pipe 42 Body is returned to storage tank 3, therefore can cut down by the fuel gas of 83 burning disposal of gas combustion apparatus.
Also, fuel gas is returned to the liquid phase part 3a of storage tank 3, therefore inhibit the gas as caused by the fuel gas of foldback Change the rising of gas pressure P2.Moreover, the pressure of fuel gas feeding pipe 42 is reduced because of the foldback of fuel gas, therefore it is The discharge-amount of compressor 4 is set to increase and increase the flow for flowing into the gasifying gas of gasifying gas pipeline 41, as a result, inhibiting The rising of gasifying gas pressure P2.Like this, it is able to suppress the rising of gasifying gas pressure P2 in LNG carry vessel 1 and cuts Subtract underway fuel consumption.
Also, in the LNG carry vessel 1 of this implementation form, manipulation device, that is, carriage clock of the control device 7 based on LNG carry vessel 1 The operating quantity of handle 80 finds out engine consumption gas flow QFuel.Also, control device 7 is formed as NBOG amount QNBOGWith start Machine consumes gas flow QFuelIt is compared, and in NBOG amount QNBOGGas flow Q is consumed more than engineFuelWhen determine engine 2 it is negative The structure that lotus reduces.
There are time lags until the load of engine 2 practical reduced time point since operating telegraph lever 80. Therefore, according to above-mentioned, the foldback amount to storage tank 3 of the fuel gas of fuel gas feeding pipe 42 can be made prior to engine 2 The time point of load reduction and increase.It, can also be in addition, telegraph lever 80 is an example of the manipulation device of LNG carry vessel 1 It is to determine that engine consumes gas flow Q based on the operating quantity of other manipulation devices different from telegraph lever 80Fuel.Alternatively, It is also possible to engine consumption gas flow QFuelUse measured value.Also, can also working as based on navigation plan and LNG carry vessel 1 Front position determines the reduction of the load of engine 2.For example, it may be control device 7 be based on pre-stored navigation plan and The current location for the LNG carry vessel 1 that GPS device measurement (not shown) obtains, the load of the engine 2 when prediction enters in bay Reduction, increase before LNG carry vessel 1 enters in bay the fuel gas of fuel gas feeding pipe 42 to storage tank 3 Foldback amount.
Also, the LNG carry vessel 1 of this implementation form is also equipped with：Detect the gasifying gas of the pressure of gas phase portion 3b in storage tank 3 Pressure gauge 72；The gas combustion apparatus 83 of burning fuel gas；Connect fuel gas feeding pipe 42 and gas combustion apparatus 83 Gas exhaust piping 81；And it is set to the exhaust valve 82 of gas exhaust piping 81.Also, control device 7 is in gasifying gas pressure gauge 72 When the pressure measured is more than defined pressure of storage tank allowed band, to increase through the guidance of gas exhaust piping 81 to gas combustion apparatus The aperture of the form control exhaust valve 82 of the amount of 83 fuel gas, and accordingly reduced and returned with the aperture increase with exhaust valve 82 Send the aperture of the form control foldback valve 62 of the aperture of valve 62.
Thereby, when the gasifying gas pressure P2 of storage tank 3 is more than pressure of storage tank allowed band, by fuel gas feeding pipe Part or all of 42 extra fuel gas is sent to gas combustion apparatus 83 and carries out burning disposal.Therefore, fuel gas The pressure reduction of feeding pipe 42, so the discharge-amount of compressor 4 increases.Thereby, it send from storage tank 3 to the NBOG's of compressor 4 Amount increases, therefore can prevent the excessive rising of gasifying gas pressure P2.
Also, the LNG carry vessel 1 of this implementation form is also equipped with：Liquefied gas in storage tank 3 is guided strong to compressor 4 Gasifying gas pipeline 51 processed；It is set to the gasifier 52 of forced gasification gas piping 51；And it is set to forced gasification flue Road 51 and control to gasifier 52 flow into liquefied gas flow forced gasification valve 53.Also, control device 7 is determining to send out Form control forced gasification valve 53 when 2 load reduction of motivation to shut down.
Thereby, when determining 2 load reduction of engine, stop the supply of FBOG and preferentially send NBOG to compressor 4, from And more NBOG can be extracted out out of storage tank 3.
Also, the fuel gas feed system 10 of the LNG carry vessel 1 of this implementation form is in fuel gas feeding pipe 42 Way is provided with the gas collectors 42a with the flow path cross sectional area greater than other parts.Foldback pipe is connected on gas collectors 42a Road 61.The variation of fuel gas pressure can be mitigated by the volume of gas collectors 42a.
Also, the LNG carry vessel 1 of this implementation form has：Generator unit 91, the generator unit 91 have multiple groups engine 2 and from the engine 2 export mechanical energy obtain the generator 912 of electric power；Propulsion unit 93, the propulsion unit 93 have It the propulsion motor 931 that generates electricity obtained electric power by generator unit 91 to drive and is revolved because of the output of propulsion motor 931 The propeller 933 turned；With with electric control unit 92, the electric control unit 92 of matching is set to from generator unit 91 to propulsion The electric power supply system of unit 93, the obtained electric power that generates electricity to generator unit 91 carries out distribution, and controls propulsion motor 931 Output.
In the LNG carry vessel 1 of above structure, driven by electric power that the mechanical energy exported with engine 2 generates electricity Propulsion unit 93.For example, load change of the load of engine 2 prior to propulsion unit 93 can be made and changed, so as to guard against The variation of the load of actual propulsion unit 93.Therefore, the fuel gas feed system 10 of above-mentioned implementation form is suitable for above-mentioned The LNG carry vessel 1 of structure.
Ideal implementation form of the invention is explained above, according to the explanation, a variety of improvement of the invention and Other implementation forms etc. become clear to those skilled in the art.Therefore, above description should only be interpreted as example, be with to It is provided for the purpose of those skilled in the art's displaying execution optimal form of the invention.Without departing from purport of the invention, It can be constructed and/or the particular content of function carries out material alteration.
For example, the fuel gas feed system 10 of the LNG carry vessel 1 of above-mentioned implementation form also be used as to this implementation shape The system of the propulsion system supply fuel gas of the different form of the propulsion system 90 of state.It is also possible to the combustion of above-mentioned implementation form Material gas supply system 10 be suitable for for example merely with fuel gas as the gas of fuel specially burn engine, can using fire Material oil and both fuel gas as the binary fuel engine of fuel and the steam turbine engines for being mounted with boiler etc. it In more than one engine supply fuel gas system.Also, the LNG carry vessel 1 of this implementation form is to be electrically propelled mode, But the propulsion mode of LNG carry vessel 1 is without being limited thereto, is also possible to directly drive the propulsion side of propeller with the output of engine 2 Formula.
Symbol description：
1 LNG carry vessel（One example of liquefied gas carry vessel）；
2 engines；
3 storage tanks；
4 compressors；
10 fuel gas feed systems；
41 gasifying gas pipelines；
42 fuel gas feeding pipes；
51 forced gasification gas pipings；
52 gasifiers；
61 foldback pipelines；
62 foldback valves；
81 gas exhaust pipings；
82 exhaust valves；
83 gas combustion apparatus；
90 propulsion systems；
91 generator units；
92 match electric control unit；
93 propulsion units；
P1 fuel gas pressure；
P2 gasifying gas pressure.

Claims (7)

1. a kind of liquefied gas carry vessel, which is characterized in that have：
The storage tank of store liquefied gas body；
The variable compressor of discharge-amount；
The engine of energy combustion gas；
The gasifying gas generated in the storage tank is guided to the gasifying gas pipeline of the compressor；
Fuel gas is guided to the fuel gas feeding pipe of the engine, the fuel gas is by including the gasification gas The gas of body is formed through the compressor compresses；
Detect the fuel gas pressure meter of the pressure of the fuel gas in the fuel gas feeding pipe；
It is connect with the fuel gas feeding pipe and will be in part or all of guidance to the storage tank of the fuel gas Liquid phase foldback pipeline；
It is set to the variable foldback valve of the foldback pipeline and aperture；And
Control device, the control device is so that the pressure that the fuel gas pressure measures is in the requirement of the engine The discharge-amount of compressor described in form control in pressure limit, and the reduction of the load of the engine is monitored, and determining When the engine load reduces, so as to consume gas flow with engine and flow into the gasifying gas pipeline from the storage tank The fuel gas of the substantial a considerable amount of the difference of the amount of the gasifying gas is returned to the storage by the foldback pipeline The form of tank controls the aperture of the foldback valve.
2. liquefied gas carry vessel according to claim 1, which is characterized in that
The control device is formed as disappearing the amount for flowing into the gasifying gas of the gasifying gas pipeline with the engine The gas consumption scale of construction is compared, and when the amount of the gasifying gas is more than engine consumption gas flow, determines the engine The structure of load reduction.
3. liquefied gas carry vessel according to claim 2, which is characterized in that
The operating quantity that the control device is formed as the manipulation device based on the liquefied gas carry vessel finds out the engine Consume the structure of gas flow.
4. liquefied gas carry vessel according to any one of claim 1 to 3, which is characterized in that
It is also equipped with：
Detect the gasifying gas pressure gauge of the pressure of gas phase in the storage tank；
Burn the gas combustion apparatus of the fuel gas；
Connect the gas exhaust piping of the fuel gas feeding pipe and the gas combustion apparatus；And
It is set to the exhaust valve of the gas exhaust piping；
The control device the pressure that the gasifying gas pressure gauge measures be more than defined pressure of storage tank allowed band when, with Increase and row described in the form control to the amount of the fuel gas of the gas combustion apparatus is guided by the gas exhaust piping The aperture of air valve, and accordingly reduce with the increase of the aperture with the exhaust valve form control institute of the aperture of the foldback valve State the aperture of foldback valve.
5. liquefied gas carry vessel according to any one of claim 1 to 4, which is characterized in that
It is also equipped with：
The liquefied gas in the storage tank is guided to the forced gasification gas piping of the compressor；
It is set to the gasifier of the forced gasification gas piping；And
It is set to the pressure of the forced gasification gas piping and the flow of the liquefied gas of the control inflow gasifier Gasification valve；
Forced gasification valve described in the form control that the control device is shut down when determining that the engine load reduces.
6. liquefied gas carry vessel according to any one of claim 1 to 5, which is characterized in that
The midway of the fuel gas feeding pipe is provided with the gas collectors with the flow path cross sectional area bigger than other parts, The foldback pipeline is connected in the gas collectors.
7. liquefied gas carry vessel according to any one of claim 1 to 6, which is characterized in that
Have：
Generator unit, the generator unit have engine described in multiple groups and obtain electricity from the mechanical energy that the engine exports The generator of power；
Propulsion unit, the propulsion unit have by electric power that the generator unit generates electricity the propulsion motor driven, And the propeller rotated by the output of the propulsion motor；With
It is described to be set to the electric power from the generator unit to the propulsion unit with electric control unit with electric control unit Feed system carries out distribution to the electric power that the generator unit generates electricity, and controls the output of the propulsion motor.
CN201780016962.8A 2016-03-16 2017-03-10 Liquefied gas carry vessel Pending CN108883818A (en)

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JP2016-051872 2016-03-16
JP2016051872A JP6613179B2 (en) 2016-03-16 2016-03-16 Liquefied gas carrier
PCT/JP2017/009757 WO2017159568A1 (en) 2016-03-16 2017-03-10 Liquified gas carrying vessel

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CN103443434A (en) * 2011-03-11 2013-12-11 大宇造船海洋株式会社 Method for supplying fuel for high-pressure natural gas injection engine
CN103547787A (en) * 2011-03-22 2014-01-29 大宇造船海洋株式会社 System for supplying fuel to high-pressure natural gas injection engine having excess evaporation gas consumption means
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