WO2014050269A1 - Fuel gas supply and purge system for diesel engine - Google Patents

Fuel gas supply and purge system for diesel engine Download PDF

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Publication number
WO2014050269A1
WO2014050269A1 PCT/JP2013/069663 JP2013069663W WO2014050269A1 WO 2014050269 A1 WO2014050269 A1 WO 2014050269A1 JP 2013069663 W JP2013069663 W JP 2013069663W WO 2014050269 A1 WO2014050269 A1 WO 2014050269A1
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WO
WIPO (PCT)
Prior art keywords
fuel gas
diesel engine
pipe
gas
gas supply
Prior art date
Application number
PCT/JP2013/069663
Other languages
French (fr)
Japanese (ja)
Inventor
石田　裕幸
晃洋 三柳
平岡　直大
繁樹 田中
壮太 渡邉
耕之 駒田
Original Assignee
三菱重工業株式会社
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 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to JP2014538240A priority Critical patent/JP5881836B2/en
Priority to CN201380030308.4A priority patent/CN104350259B/en
Priority to KR1020147034391A priority patent/KR101639934B1/en
Publication of WO2014050269A1 publication Critical patent/WO2014050269A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F02D19/0621—Purging of the fuel system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • 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

Definitions

  • the present invention relates to a fuel gas supply / purge system of a diesel engine, which is applied to a diesel engine capable of burning both fuel oil and fuel gas or fuel gas by high-pressure injection.
  • Patent Document 1 As a diesel engine fuel gas supply / purge system applied to a diesel engine capable of burning both fuel oil and fuel gas by high-pressure injection, for example, the one disclosed in Patent Document 1 is known. Yes.
  • Patent Document 1 In the invention described in the above-mentioned Patent Document 1, four types of electromagnetic valves, that is, a gas injection valve (gas injection valve) 2, a shut-off valve (gas gate valve) 28, and a blow-off valve (gas) are used for one cylinder. A blow valve 30 and a purge valve (gas purge valve) 32 are provided. Therefore, the invention described in Patent Document 1 has a problem that the equipment cost and running cost are increased.
  • the present invention has been made in order to solve the above-described problems, and can reduce the risk of gas leakage by reducing the length of a pipe (high-pressure pipe) through which high-pressure fuel gas flows, and It is an object of the present invention to provide a fuel gas supply / purge system for a diesel engine capable of reducing equipment costs and running costs.
  • a diesel engine fuel gas supply / purge system is applied to a diesel engine capable of burning both fuel oil and fuel gas or fuel gas by high-pressure injection.
  • a fuel gas supply / purge system wherein a fuel gas led from a fuel gas supply source is led to one end of a fuel gas branch pipe provided corresponding to each cylinder of the diesel engine.
  • a plurality of fuels having one end connected to the fuel gas main pipe extending along the longitudinal direction of the diesel engine and the other end connected to an accumulator provided corresponding to each cylinder of the diesel engine.
  • a gas branch pipe and one end thereof is connected to the accumulator, and the other end is provided corresponding to each cylinder of the diesel engine.
  • a fuel gas supply system including a fuel gas supply pipe connected to the injection valve; and an inert gas branch pipe provided in correspondence with each cylinder of the diesel engine for supplying an inert gas led from an inert gas supply source.
  • One inert gas main pipe leading to the exhaust gas one end of which is connected to the inert gas main pipe extending along the longitudinal direction of the diesel engine, and the other end of which is a plurality of inert gas branch pipes connected to the accumulator, and one end thereof Is connected to the accumulator, the other end is connected to the fuel gas branch pipe in the middle of the first return pipe, and one end thereof is more than the fuel gas main pipe extending along the longitudinal direction of the diesel engine.
  • a fuel gas purge system comprising: a second return pipe connected to the purge line at the other end of the fuel gas main pipe located on the downstream side of the fuel gas main pipe, and the fuel gas branch pipe
  • the fuel gas supply / purge system of the diesel engine when the operation of the diesel engine with the fuel gas is finished and the fuel gas remaining in the fuel gas supply system is purged with the inert gas,
  • the fuel gas remaining in the accumulator is discharged to the purge line via the first return pipe, the fuel gas branch pipe, the fuel gas main pipe, and the second return pipe. That is, the fuel gas remaining in the accumulator is returned to the fuel gas branch pipe via the first return pipe and discharged to the purge line via the fuel gas main pipe and the second return pipe.
  • the fuel gas main pipe and the fuel gas branch pipe also serve as a part of the fuel gas purge system.
  • the length of the pipe (high pressure pipe) through which the high-pressure fuel gas flows can be shortened, and the risk of gas leakage can be reduced.
  • a blow-off valve (gas blow valve) 30 is provided among the four types of electromagnetic valves required for each cylinder in the invention described in Patent Document 1.
  • the purge valve (gas purge valve) 32 becomes unnecessary. Thereby, reduction of an installation cost and a running cost can be aimed at.
  • an orifice is provided in the middle of the first return pipe in the fuel gas supply / purge system of the diesel engine.
  • the fuel gas remaining in the accumulator is decompressed when passing through the orifice.
  • the first return pipe located downstream from the orifice can be a low-pressure specification pipe (normal pipe) instead of a high-pressure specification pipe. That is, the length of the pipe (high pressure pipe) through which the high pressure fuel gas flows can be shortened to reduce the risk of gas leakage.
  • the accumulator, the gas non-return valve, the gas gate valve, the inert gas non-return valve, and the orifice are in one casing. It is more preferable that it is housed in the housing.
  • the leaked gas can be sealed in the casing, and the atmosphere outside the casing is normal (clean) ) Can be kept.
  • the gas gate valve is set to be opened / closed intermittently or continuously opened after the operation with the fuel gas is completed. More preferably.
  • the fuel gas remaining between the gas injection valve and the gas gate valve is purged with the inert gas, and between the gas injection valve and the gas gate valve.
  • the fuel gas supply pipe located at the position can be filled with the inert gas.
  • the diesel engine according to the fifth aspect of the present invention includes the fuel gas supply / purge system of any of the above diesel engines.
  • a fuel gas supply / purge system for a diesel engine that can reduce the risk of gas leakage and can reduce the equipment cost and the running cost. Therefore, the safety and reliability of the diesel engine can be improved, and the equipment cost and running cost of the diesel engine can be reduced.
  • the length of the pipe (high pressure pipe) through which the high-pressure fuel gas flows can be shortened, and the risk of gas leakage can be reduced. There is an effect that the cost and running cost can be reduced.
  • FIG. 1 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to an embodiment of the present invention.
  • FIG. 1 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to an embodiment of the present invention, for explaining a flow of fuel gas and an open / close state of each valve at the time of fuel gas supply;
  • FIG. (A) is a figure which shows the timing of opening and closing of the gas injection valve (GIV) shown in FIG. 2
  • (b) is a figure which shows the timing of opening and closing of the gas gate valve (GGV) shown in FIG.
  • FIG. (A) is a figure which shows the timing of opening and closing of the gas injection valve (GIV) shown in FIG. 2
  • GIV gas injection valve
  • GGV gas gate valve
  • FIG. 1 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to an embodiment of the present invention, and is a diagram for explaining the flow of inert gas and the open / close state of each valve at the time of supplying inert gas. is there. It is a graph which shows the relationship between the time (second) after opening a gas purge valve, the pressure in an accumulator, opening and closing of a gas gate valve (GGV), and opening and closing of an inert gas non-return valve (IGNRV).
  • FIG. 5 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to another embodiment of the present invention.
  • FIG. 5 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to another embodiment of the present invention.
  • a fuel gas supply / purge system (hereinafter referred to as “fuel gas supply / purge system”) 1 of the diesel engine according to the present embodiment includes a fuel gas supply system 2 and a fuel gas purge system 3.
  • the fuel gas supply system 2 includes one fuel gas main pipe 11 that leads high pressure (for example, 30 MPa: 300 bar) fuel gas to each cylinder of the diesel engine, a plurality of fuel gas branch pipes 12, and a plurality of fuel gases. And a supply pipe 13.
  • the fuel gas main pipe 11 supplies the fuel gas led from a fuel gas supply source (not shown) to one end of the fuel gas branch pipe 12 provided corresponding to each cylinder of the diesel engine (upstream end at the time of fuel gas supply). And a portion connected to one end of the fuel gas branch pipe 12 extends along the longitudinal direction of the diesel engine.
  • a shutoff valve (shutoff valve) 21 is connected in the middle of the fuel gas main pipe 11 located on the fuel gas supply source side with respect to the fuel gas main pipe 11 extending along the longitudinal direction of the diesel engine.
  • One end of the fuel gas branch pipe 12 is connected to the fuel gas main pipe 11 extending along the longitudinal direction of the diesel engine, and the other end (downstream end when supplying the fuel gas) corresponds to each cylinder of the diesel engine.
  • a pipe (high pressure pipe) connected to the accumulator 22 provided, and a gas non-return valve (GNRV) 23 is connected in the middle thereof.
  • the number of fuel gas branch pipes 12 is the same as the number of cylinders of the diesel engine.
  • the fuel gas supply pipe 13 has one end (upstream end at the time of fuel gas supply) connected to the accumulator 22, and the other end (downstream end at the time of fuel gas supply) corresponding to each cylinder of the diesel engine.
  • a gas gate valve (GGV) 25 is connected to a pipe (high-pressure pipe) connected to the gas injection valve (GIV) 24.
  • the number of fuel gas supply pipes 13 is the same as the number of gas injection valves 24 provided corresponding to each cylinder ⁇ the number of cylinders of the diesel engine.
  • the fuel gas purge system 3 includes a single inert gas main pipe 31 that leads low pressure (for example, 1 MPa: 10 bar) inert gas (N 2 gas in the present embodiment) to each cylinder of the diesel engine, a plurality of inert gas branch pipes 32, A plurality of first return pipes 33 and a single second return pipe 34 are provided.
  • low pressure for example, 1 MPa: 10 bar
  • inert gas N 2 gas in the present embodiment
  • the inert gas main pipe 31 is a pipe that leads the inert gas led from an inert gas supply source (not shown) to one end of the inert gas branch pipe 32 provided corresponding to each cylinder of the diesel engine (upstream end when the inert gas is supplied). A portion connected to one end of the inert gas branch pipe 32 extends along the longitudinal direction of the diesel engine. Further, an inert gas valve 35 and a safety valve (safety valve) 36 are connected from the upstream side in the middle of the inert gas main pipe 31 positioned on the inert gas supply source side with respect to the inert gas main pipe 31 extending along the longitudinal direction of the diesel engine. .
  • inert gas branch pipe 32 One end of the inert gas branch pipe 32 is connected to an inert gas main pipe 31 extending along the longitudinal direction of the diesel engine, and the other end (downstream end when the inert gas is supplied) is provided corresponding to each cylinder of the diesel engine.
  • An inert gas non-return valve (IGNRV) 37 is connected in the middle of the pipe (low pressure pipe) connected to the accumulator 22.
  • the number of inert gas branch pipes 32 is the same as the number of cylinders of the diesel engine.
  • first return pipe 33 (upstream end when supplying inert gas) is connected to the accumulator 22, and the other end (downstream end when supplying inert gas) is the fuel gas branch located outside the gas accumulator box 38.
  • An orifice 39 is connected to the middle of a first return pipe 33 that is connected to the middle of the pipe 12 and is located inside the casing, which is called a gas accumulator box 38. Note that the number of the first return pipes 33 is the same as the number of cylinders of the diesel engine.
  • the second return pipe 34 has one end (upstream end when inert gas is supplied) positioned on the fuel gas supply source side of the fuel gas main pipe 11 extending along the longitudinal direction of the diesel engine, and the shutoff valve 21.
  • a pipe (low pressure pipe) connected in the middle of the fuel gas main pipe 11 located on the downstream side and having the other end (downstream end when the inert gas is supplied) connected to a purge line (not shown),
  • a gas purge valve 40 is connected in the middle of the second return pipe 34.
  • the fuel gas is supplied from the fuel gas supply source to each cylinder through the fuel gas main pipe 11, the fuel gas branch pipe 12, the accumulator 22, and the fuel gas supply pipe 13.
  • the shut-off valve 21 is continuously opened, the gas purge valve 40 and the inert gas valve 35 are continuously closed, and the gas injection valve 24 and the gas gate valve 25 are shown in FIGS. 3 (a) and 3 (b).
  • the valve is opened and closed intermittently (intermittently).
  • the gas gate valve 25 is set to open earlier than the gas injection valve 24 and close later than the gas injection valve 24.
  • opening and closing of the gas gate valve 25 is started after the gas purge valve 40 is opened and after a predetermined time has elapsed (20 seconds in the present embodiment). Then, the fuel gas remaining in the fuel gas supply pipe 13 flows into the accumulator 22, and the fuel gas that flows into the accumulator 22 from the fuel gas supply pipe 13 together with the fuel gas remaining in the accumulator 22 is the first.
  • the return pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34 are discharged to the purge line.
  • the pressure of the fuel gas remaining in the accumulator 22 is changed from the inert gas supply source to the inert gas main pipe 31 and the inert gas branch.
  • the pressure of the inert gas supplied to the accumulator 22 through the pipe 32 is lowered.
  • the inert gas non-return valve 37 is opened, and the inert gas is supplied from the inert gas supply source to the accumulator 22 through the inert gas main pipe 31 and the inert gas branch pipe 32, and in the accumulator 22, the fuel gas supply pipe 13, and the first return pipe 33.
  • the fuel gas remaining in the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34 is discharged to the purge line, the accumulator 22, the fuel gas supply pipe 13, the first The return gas pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34 are filled with the inert gas.
  • the fuel gas discharged to the purge line is burned by a gas combustion unit (GCU) provided at the downstream end of the purge line. Further, when supplying the inert gas, the shutoff valve 21 and the gas injection valve 24 are continuously closed, and the inert gas valve 35 is continuously opened.
  • GCU gas combustion unit
  • the fuel gas supply / purge system 1 when the operation of the diesel engine with the fuel gas is finished and the fuel gas remaining in the fuel gas supply system 2 is purged with the inert gas, the fuel gas supply / purge system 1 remains in the accumulator 22.
  • the fuel gas to be discharged is discharged to the purge line via the first return pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34. That is, the fuel gas remaining in the accumulator 22 is returned to the fuel gas branch pipe 12 via the first return pipe 33 and discharged to the purge line via the fuel gas main pipe 11 and the second return pipe 34. It will be.
  • the fuel gas main pipe 11 and the fuel gas branch pipe 12 also serve as part of the fuel gas purge system 3.
  • the length of the pipe (high pressure pipe) through which the high-pressure fuel gas flows can be shortened, and the risk of gas leakage can be reduced.
  • a blowout valve (gas blow valve) 30 and The purge valve (gas purge valve) 32 becomes unnecessary. Thereby, reduction of an installation cost and a running cost can be aimed at.
  • the orifice 39 is provided in the middle of the first return pipe 33, and the fuel gas remaining in the accumulator 22 passes through the orifice 39. At that time, the pressure is reduced.
  • the first return pipe 33 located downstream from the orifice 39 can be a low-pressure specification pipe (normal pipe) instead of a high-pressure specification pipe. That is, the length of the pipe (high pressure pipe) through which the high pressure fuel gas flows can be shortened to reduce the risk of gas leakage.
  • the accumulator 22, the gas non-return valve 23, the gas gate valve 25, the inert gas non-return valve 37, and the orifice 39 are referred to as a gas accumulator box 38. Even if a gas leak occurs in the casing, the leaked gas can be contained in the casing, and the atmosphere outside the casing can be kept normal (clean).
  • the gas gate valve 25 is set to be intermittently opened / closed or continuously opened after the operation with the fuel gas is completed. Therefore, the fuel gas remaining between the gas injection valve 24 and the gas gate valve 25 is purged with the inert gas, and the inside of the fuel gas supply pipe 13 positioned between the gas injection valve 24 and the gas gate valve 25 is filled with the inert gas. Can be satisfied.
  • the diesel engine according to the present embodiment includes a fuel gas supply / purge system 1 for a diesel engine that can reduce the risk of gas leakage and can reduce equipment costs and running costs. Therefore, the safety and reliability of the diesel engine can be improved, and the equipment cost and running cost of the diesel engine can be reduced.
  • a fuel gas supply / purge system for a diesel engine according to another embodiment of the present invention will be described with reference to FIG.
  • the fuel gas supply / purge system 61 of the diesel engine according to the present embodiment is described above in that a check valve 62 having a flow limiter function and a forced opening function is provided instead of the gas gate valve 25.
  • a check valve 62 having a flow limiter function and a forced opening function is provided instead of the gas gate valve 25.
  • the check valve 62 fails to close while the gas injection valve 24 is open, and the pressure in the cylinder (in-cylinder) is not accumulator 22.
  • the (second) valve seat 63 that restricts the flow rate of the fuel gas leaking (inflowing) from the accumulator 22 into the cylinder, the check valve 62 and the gas injection valve 24.
  • an actuator for example, a hydraulic piston
  • valve 6 indicates a biasing member (for example, a spring) that biases the valve body 64 in the closing direction
  • reference numeral 67 indicates a valve body 64 that is pressed by the actuator 65 and moves together with the valve body 64.
  • a reference numeral 68 denotes a (first) valve seat.
  • an inexpensive check valve 62 can be employed in place of the expensive gas gate valve 25, and equipment costs and maintenance costs can be reduced.
  • the gas injection valve 24 remains open and fails to close, and When the pressure in the cylinder is lower than the pressure in the accumulator 22, the flow rate of the fuel gas leaking from the accumulator 22 into the cylinder blocks the passage by the valve seat 63, so that the fuel gas does not enter the cylinder. Will not flow into.
  • the actuator 65 presses a part 67 of the valve body 64 toward the seat 63, whereby the check valve 62 and the gas injection valve 24 are connected.
  • the fuel gas in the fuel gas supply pipe 13 positioned therebetween can be returned to the accumulator 22 side.
  • a fuel gas supply / purge system for a diesel engine according to another embodiment of the present invention will be described with reference to FIG.
  • the fuel gas supply / purge system 71 of the diesel engine according to the present embodiment is different from the check valve 62 in that a check valve 72 not provided with a flow limiter function and a forced opening function is provided. It differs from that of the embodiment described with reference to FIG. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
  • symbol is attached
  • the check valve 72 includes a valve body 64 and an urging member 66, and does not include the valve seat 63, the actuator 65, and a part 67 of the valve body 64.
  • a cheaper check valve 72 that does not include a part of the actuator 65 and the valve body 64 can be employed, which further increases equipment costs and maintenance costs. Reduction can be achieved.
  • Other functions and effects are the same as those in the above-described embodiment, and thus description thereof is omitted here.
  • this invention is not limited to embodiment mentioned above, It can also implement by changing and changing suitably as needed.
  • the orifice 39 in the above-described embodiment is not an essential component, and the orifice 39 may be omitted.
  • the accumulator 22, the gas non-return valve 23, the gas gate valve 25, the inert gas non-return valve 37, and the orifice 39 are stored in a single housing called a gas accumulator box 38.
  • a gas accumulator box 38 Although described as a specific example, the present invention is not limited to this.
  • the accumulator 22, the gas non-return valve 23, the gas gate valve 25, the inert gas non-return valve 37, and the orifice 39 are provided in the gas accumulator box 38. It is also possible to adopt a configuration that is not housed in a single casing.
  • the check valves 62 and 72 are disposed outside (outside) the gas accumulator box 38, but the present invention is not limited to this, and the check valves 62 and 72 are not limited thereto. May be arranged in (inside) the gas accumulator box 38.

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

In this fuel gas supply and purge system (1) for a diesel engine, when operation of the diesel engine on a fuel gas ends and the fuel gas remaining in a fuel gas supply system (2) is purged by an inert gas, the fuel gas remaining in an accumulator (22) is discharged to a purge line through a first return pipe (33), a fuel gas branch pipe (12), a fuel gas main pipe (11) and a second return pipe (34).

Description

ディーゼル機関の燃料ガス供給・パージ系統Diesel engine fuel gas supply / purge system
　本発明は、高圧噴射によって、燃料油および燃料ガスの両方、または燃料ガスを燃焼させることができるディーゼル機関に適用される、ディーゼル機関の燃料ガス供給・パージ系統に関するものである。 The present invention relates to a fuel gas supply / purge system of a diesel engine, which is applied to a diesel engine capable of burning both fuel oil and fuel gas or fuel gas by high-pressure injection.
　高圧噴射によって、燃料油および燃料ガスの両方を燃焼させることができるディーゼル機関に適用される、ディーゼル機関の燃料ガス供給・パージ系統としては、例えば、特許文献１に開示されたものが知られている。 As a diesel engine fuel gas supply / purge system applied to a diesel engine capable of burning both fuel oil and fuel gas by high-pressure injection, for example, the one disclosed in Patent Document 1 is known. Yes.
特開平９－２０９７８８号公報（図７）Japanese Patent Laid-Open No. 9-209788 (FIG. 7)
　しかしながら、上記特許文献１に記載された発明では、一つのシリンダに対して四種類の電磁弁、すなわち、ガス噴射弁（ガスインジェクションバルブ）２、遮断弁（ガスゲートバルブ）２８、吹出し弁（ガスブローバルブ）３０、およびパージ弁（ガスパージバルブ）３２が設けられている。そのため、上記特許文献１に記載された発明では、設備コストおよびランニングコストが高騰してしまうといった問題点があった。 However, in the invention described in the above-mentioned Patent Document 1, four types of electromagnetic valves, that is, a gas injection valve (gas injection valve) 2, a shut-off valve (gas gate valve) 28, and a blow-off valve (gas) are used for one cylinder. A blow valve 30 and a purge valve (gas purge valve) 32 are provided. Therefore, the invention described in Patent Document 1 has a problem that the equipment cost and running cost are increased.
　また、上記特許文献１に記載された発明では、高圧の燃料ガスを流すための配管（高圧管）が二本、すなわち、燃料ガス供給時において高圧コンプレッサ２０で昇圧された高圧の燃料ガスをガスアキュームレータ２７に導く供給管２３と、不活性ガス（イナートガス）供給時においてガスアキュームレータ２７内に蓄圧された高圧の燃料ガスを換気装置３６に導くドレーン管３１，３５とが設けられている。そのため、上記特許文献１に記載された発明では、高圧の燃料ガスを流すための配管（高圧管）が長くなり、ガス漏れのリスクが高いといった問題点もあった。 Further, in the invention described in Patent Document 1, two pipes (high-pressure pipes) for flowing high-pressure fuel gas are used, that is, the high-pressure fuel gas boosted by the high-pressure compressor 20 is supplied when fuel gas is supplied. A supply pipe 23 that leads to the accumulator 27 and drain pipes 31 and 35 that lead the high-pressure fuel gas accumulated in the gas accumulator 27 to the ventilator 36 when an inert gas (inert gas) is supplied are provided. For this reason, the invention described in Patent Document 1 has a problem that a pipe (high pressure pipe) for flowing a high-pressure fuel gas becomes long and the risk of gas leakage is high.
　本発明は、上記課題を解決するためになされたものであり、高圧の燃料ガスが流通する配管（高圧管）の長さを短くして、ガス漏れのリスクを減少させることができ、かつ、設備コストおよびランニングコストの削減を図ることができるディーゼル機関の燃料ガス供給・パージ系統を提供することを目的とする。 The present invention has been made in order to solve the above-described problems, and can reduce the risk of gas leakage by reducing the length of a pipe (high-pressure pipe) through which high-pressure fuel gas flows, and It is an object of the present invention to provide a fuel gas supply / purge system for a diesel engine capable of reducing equipment costs and running costs.
　本発明は、上記課題を解決するため、以下の手段を採用した。
　本発明の第１の態様に係るディーゼル機関の燃料ガス供給・パージ系統は、高圧噴射によって、燃料油および燃料ガスの両方、または燃料ガスを燃焼させることができるディーゼル機関に適用される、ディーゼル機関の燃料ガス供給・パージ系統であって、燃料ガス供給源から導かれた燃料ガスを、前記ディーゼル機関の各シリンダに対応して設けられた燃料ガス枝管の一端に導く一本の燃料ガス主管と、その一端が、前記ディーゼル機関の長手方向に沿って延びる前記燃料ガス主管に接続され、その他端が、前記ディーゼル機関の各シリンダに対応して設けられたアキュームレータに接続された複数本の燃料ガス枝管と、その一端が、前記アキュームレータに接続され、その他端が、前記ディーゼル機関の各シリンダに対応して設けられたガスインジェクションバルブに接続された燃料ガス供給管と、を備えた燃料ガス供給系統と、イナートガス供給源から導かれたイナートガスを、前記ディーゼル機関の各シリンダに対応して設けられたイナートガス枝管の一端に導く一本のイナートガス主管と、その一端が、前記ディーゼル機関の長手方向に沿って延びる前記イナートガス主管に接続され、その他端が、前記アキュームレータに接続された複数本のイナートガス枝管と、その一端が、前記アキュームレータに接続され、その他端が、前記燃料ガス枝管の途中に接続された第１の戻り管と、その一端が、前記ディーゼル機関の長手方向に沿って延びる前記燃料ガス主管よりも前記燃料ガス供給源の側に位置するとともに、前記燃料ガス主管の途中に接続されたシャットオフバルブよりも下流側に位置する前記燃料ガス主管の途中に接続され、その他端が、パージラインに接続された第２の戻り管と、を備えた燃料ガスパージ系統と、を備え、前記燃料ガス枝管の途中にガスノンリターンバルブが、前記燃料ガス供給管の途中にガスゲートバルブが、前記イナートガス枝管の途中にイナートガスノンリターンバルブが設けられている。 The present invention employs the following means in order to solve the above problems.
A diesel engine fuel gas supply / purge system according to a first aspect of the present invention is applied to a diesel engine capable of burning both fuel oil and fuel gas or fuel gas by high-pressure injection. A fuel gas supply / purge system, wherein a fuel gas led from a fuel gas supply source is led to one end of a fuel gas branch pipe provided corresponding to each cylinder of the diesel engine. A plurality of fuels having one end connected to the fuel gas main pipe extending along the longitudinal direction of the diesel engine and the other end connected to an accumulator provided corresponding to each cylinder of the diesel engine. A gas branch pipe and one end thereof is connected to the accumulator, and the other end is provided corresponding to each cylinder of the diesel engine. A fuel gas supply system including a fuel gas supply pipe connected to the injection valve; and an inert gas branch pipe provided in correspondence with each cylinder of the diesel engine for supplying an inert gas led from an inert gas supply source. One inert gas main pipe leading to the exhaust gas, one end of which is connected to the inert gas main pipe extending along the longitudinal direction of the diesel engine, and the other end of which is a plurality of inert gas branch pipes connected to the accumulator, and one end thereof Is connected to the accumulator, the other end is connected to the fuel gas branch pipe in the middle of the first return pipe, and one end thereof is more than the fuel gas main pipe extending along the longitudinal direction of the diesel engine. A shut-off valve located on the fuel gas supply source side and connected in the middle of the fuel gas main pipe A fuel gas purge system comprising: a second return pipe connected to the purge line at the other end of the fuel gas main pipe located on the downstream side of the fuel gas main pipe, and the fuel gas branch pipe A gas non-return valve, a gas gate valve in the middle of the fuel gas supply pipe, and an inert gas non-return valve in the middle of the inert gas branch pipe.
　本発明の第１の態様に係るディーゼル機関の燃料ガス供給・パージ系統によれば、燃料ガスによるディーゼル機関の運転が終了して、燃料ガス供給系統に残存する燃料ガスをイナートガスでパージする際、アキュームレータ内に残存する燃料ガスは、第１の戻り管、燃料ガス枝管、燃料ガス主管、および第２の戻り管を介してパージラインに排出されることになる。すなわち、アキュームレータ内に残存する燃料ガスは、第１の戻り管を介して燃料ガス枝管に戻され、燃料ガス主管および第２の戻り管を介してパージラインに排出されることになる。言い換えれば、燃料ガス主管および燃料ガス枝管が、燃料ガスパージ系統の一部を兼ねることになる。
　これにより、高圧の燃料ガスが流通する配管（高圧管）の長さを短くして、ガス漏れのリスクを減少させることができる。
　また、本発明に係るディーゼル機関の燃料ガス供給・パージ系統では、上記特許文献１に記載された発明でシリンダ毎に必要とされた四種類の電磁弁のうち、吹出し弁（ガスブローバルブ）３０およびパージ弁（ガスパージバルブ）３２が不要になる。
　これにより、設備コストおよびランニングコストの削減を図ることができる。 According to the fuel gas supply / purge system of the diesel engine according to the first aspect of the present invention, when the operation of the diesel engine with the fuel gas is finished and the fuel gas remaining in the fuel gas supply system is purged with the inert gas, The fuel gas remaining in the accumulator is discharged to the purge line via the first return pipe, the fuel gas branch pipe, the fuel gas main pipe, and the second return pipe. That is, the fuel gas remaining in the accumulator is returned to the fuel gas branch pipe via the first return pipe and discharged to the purge line via the fuel gas main pipe and the second return pipe. In other words, the fuel gas main pipe and the fuel gas branch pipe also serve as a part of the fuel gas purge system.
Thereby, the length of the pipe (high pressure pipe) through which the high-pressure fuel gas flows can be shortened, and the risk of gas leakage can be reduced.
Further, in the fuel gas supply / purge system of the diesel engine according to the present invention, among the four types of electromagnetic valves required for each cylinder in the invention described in Patent Document 1, a blow-off valve (gas blow valve) 30 is provided. In addition, the purge valve (gas purge valve) 32 becomes unnecessary.
Thereby, reduction of an installation cost and a running cost can be aimed at.
　本発明の第２の態様として、上記ディーゼル機関の燃料ガス供給・パージ系統において、前記第１の戻り管の途中にオリフィスが設けられているとさらに好適である。 As a second aspect of the present invention, it is more preferable that an orifice is provided in the middle of the first return pipe in the fuel gas supply / purge system of the diesel engine.
　第２の態様のディーゼル機関の燃料ガス供給・パージ系統によれば、アキュームレータ内に残存する燃料ガスは、オリフィスを通過する際に減圧されることになる。
　これにより、オリフィスから下流側に位置する第１の戻り管を高圧仕様の配管ではなく、低圧仕様の配管（通常の配管）にすることができる。すなわち、高圧の燃料ガスが流通する配管（高圧管）の長さを短くして、ガス漏れのリスクを減少させることができる。 According to the fuel gas supply / purge system of the diesel engine of the second aspect, the fuel gas remaining in the accumulator is decompressed when passing through the orifice.
As a result, the first return pipe located downstream from the orifice can be a low-pressure specification pipe (normal pipe) instead of a high-pressure specification pipe. That is, the length of the pipe (high pressure pipe) through which the high pressure fuel gas flows can be shortened to reduce the risk of gas leakage.
　本発明の第３の態様として、上記ディーゼル機関の燃料ガス供給・パージ系統において、前記アキュームレータ、前記ガスノンリターンバルブ、前記ガスゲートバルブ、前記イナートガスノンリターンバルブ、および前記オリフィスが、一つの筐体内に収容されているとさらに好適である。 According to a third aspect of the present invention, in the fuel gas supply / purge system of the diesel engine, the accumulator, the gas non-return valve, the gas gate valve, the inert gas non-return valve, and the orifice are in one casing. It is more preferable that it is housed in the housing.
　第３の態様のディーゼル機関の燃料ガス供給・パージ系統によれば、筐体内においてガス漏れが生じた場合でも、漏れ出したガスを筐体内に封じ込めることができ、筐体外の雰囲気を正常（清浄）に保つことができる。 According to the fuel gas supply / purge system of the diesel engine of the third aspect, even if a gas leak occurs in the casing, the leaked gas can be sealed in the casing, and the atmosphere outside the casing is normal (clean) ) Can be kept.
　本発明の第４の態様として、上記ディーゼル機関の燃料ガス供給・パージ系統において、燃料ガスによる運転終了後、前記ガスゲートバルブが間歇的に開閉される、または連続的に開けられるように設定されているとさらに好適である。 As a fourth aspect of the present invention, in the fuel gas supply / purge system of the diesel engine, the gas gate valve is set to be opened / closed intermittently or continuously opened after the operation with the fuel gas is completed. More preferably.
　第４の態様のディーゼル機関の燃料ガス供給・パージ系統によれば、ガスインジェクションバルブとガスゲートバルブとの間に残存する燃料ガスをイナートガスでパージして、ガスインジェクションバルブとガスゲートバルブとの間に位置する燃料ガス供給管内をイナートガスで満たすことができる。 According to the fuel gas supply / purge system of the diesel engine of the fourth aspect, the fuel gas remaining between the gas injection valve and the gas gate valve is purged with the inert gas, and between the gas injection valve and the gas gate valve. The fuel gas supply pipe located at the position can be filled with the inert gas.
　本発明の第５の態様に係るディーゼル機関は、上記いずれかのディーゼル機関の燃料ガス供給・パージ系統を具備している。 The diesel engine according to the fifth aspect of the present invention includes the fuel gas supply / purge system of any of the above diesel engines.
　本発明の第５の態様に係るディーゼル機関によれば、ガス漏れのリスクを減少させることができ、かつ、設備コストおよびランニングコストの削減を図ることができるディーゼル機関の燃料ガス供給・パージ系統を具備していることになるので、当該ディーゼル機関の安全性および信頼性を向上させることができて、当該ディーゼル機関の設備コストおよびランニングコストの削減を図ることができる。 According to the diesel engine according to the fifth aspect of the present invention, there is provided a fuel gas supply / purge system for a diesel engine that can reduce the risk of gas leakage and can reduce the equipment cost and the running cost. Therefore, the safety and reliability of the diesel engine can be improved, and the equipment cost and running cost of the diesel engine can be reduced.
　本発明に係るディーゼル機関の燃料ガス供給・パージ系統よれば、高圧の燃料ガスが流通する配管（高圧管）の長さを短くして、ガス漏れのリスクを減少させることができ、かつ、設備コストおよびランニングコストの削減を図ることができるという効果を奏する。 According to the fuel gas supply / purge system of the diesel engine according to the present invention, the length of the pipe (high pressure pipe) through which the high-pressure fuel gas flows can be shortened, and the risk of gas leakage can be reduced. There is an effect that the cost and running cost can be reduced.
本発明の一実施形態に係るディーゼル機関の燃料ガス供給・パージ系統の一部を概略で示す系統図である。1 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to an embodiment of the present invention. 本発明の一実施形態に係るディーゼル機関の燃料ガス供給・パージ系統の一部を概略で示す系統図であって、燃料ガス供給時における燃料ガスの流れおよび各バルブの開閉状態を説明するための図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to an embodiment of the present invention, for explaining a flow of fuel gas and an open / close state of each valve at the time of fuel gas supply; FIG. （ａ）は図２に示すガスインジェクションバルブ（ＧＩＶ）の開閉のタイミングを示す図、（ｂ）は図２に示すガスゲートバルブ（ＧＧＶ）の開閉のタイミングを示す図である。(A) is a figure which shows the timing of opening and closing of the gas injection valve (GIV) shown in FIG. 2, (b) is a figure which shows the timing of opening and closing of the gas gate valve (GGV) shown in FIG. 本発明の一実施形態に係るディーゼル機関の燃料ガス供給・パージ系統の一部を概略で示す系統図であって、イナートガス供給時におけるイナートガスの流れおよび各バルブの開閉状態を説明するための図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to an embodiment of the present invention, and is a diagram for explaining the flow of inert gas and the open / close state of each valve at the time of supplying inert gas. is there. ガスパージバルブを開いてからの時間（秒）と、アキュームレータ内の圧力、ガスゲートバルブ（ＧＧＶ）の開閉、およびイナートガスノンリターンバルブ（ＩＧＮＲＶ）の開閉との関係を示す図表である。It is a graph which shows the relationship between the time (second) after opening a gas purge valve, the pressure in an accumulator, opening and closing of a gas gate valve (GGV), and opening and closing of an inert gas non-return valve (IGNRV). 本発明の他の実施形態に係るディーゼル機関の燃料ガス供給・パージ系統の一部を概略で示す系統図である。FIG. 5 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to another embodiment of the present invention. 本発明の別の実施形態に係るディーゼル機関の燃料ガス供給・パージ系統の一部を概略で示す系統図である。FIG. 5 is a system diagram schematically showing a part of a fuel gas supply / purge system of a diesel engine according to another embodiment of the present invention.
　以下、本発明の一実施形態に係るディーゼル機関の燃料ガス供給・パージ系統について、図１から図５を参照しながら説明する。
　本実施形態に係るディーゼル機関の燃料ガス供給・パージ系統（以下、「燃料ガス供給・パージ系統」という。）１は、燃料ガス供給系統２と、燃料ガスパージ系統３と、を備えている。 Hereinafter, a fuel gas supply / purge system for a diesel engine according to an embodiment of the present invention will be described with reference to FIGS.
A fuel gas supply / purge system (hereinafter referred to as “fuel gas supply / purge system”) 1 of the diesel engine according to the present embodiment includes a fuel gas supply system 2 and a fuel gas purge system 3.
　燃料ガス供給系統２は、高圧（例えば、３０ＭＰａ：３００ｂａｒ）の燃料ガスをディーゼル機関の各シリンダに導く一本の燃料ガス主管１１と、複数本の燃料ガス枝管１２と、複数本の燃料ガス供給管１３と、を備えている。
　燃料ガス主管１１は、燃料ガス供給源（図示せず）から導かれた燃料ガスを、ディーゼル機関の各シリンダに対応して設けられた燃料ガス枝管１２の一端（燃料ガス供給時における上流端）に導く配管（高圧管）であって、燃料ガス枝管１２の一端と接続される部分は、ディーゼル機関の長手方向に沿って延びている。また、ディーゼル機関の長手方向に沿って延びる燃料ガス主管１１よりも燃料ガス供給源の側に位置する燃料ガス主管１１の途中には、シャットオフバルブ（遮断弁）２１が接続されている。 The fuel gas supply system 2 includes one fuel gas main pipe 11 that leads high pressure (for example, 30 MPa: 300 bar) fuel gas to each cylinder of the diesel engine, a plurality of fuel gas branch pipes 12, and a plurality of fuel gases. And a supply pipe 13.
The fuel gas main pipe 11 supplies the fuel gas led from a fuel gas supply source (not shown) to one end of the fuel gas branch pipe 12 provided corresponding to each cylinder of the diesel engine (upstream end at the time of fuel gas supply). And a portion connected to one end of the fuel gas branch pipe 12 extends along the longitudinal direction of the diesel engine. Further, a shutoff valve (shutoff valve) 21 is connected in the middle of the fuel gas main pipe 11 located on the fuel gas supply source side with respect to the fuel gas main pipe 11 extending along the longitudinal direction of the diesel engine.
　燃料ガス枝管１２は、その一端が、ディーゼル機関の長手方向に沿って延びる燃料ガス主管１１に接続され、その他端（燃料ガス供給時における下流端）が、ディーゼル機関の各シリンダに対応して設けられたアキュームレータ２２に接続された配管（高圧管）であって、その途中には、ガスノンリターンバルブ（ＧＮＲＶ）２３が接続されている。
　なお、燃料ガス枝管１２の本数は、ディーゼル機関のシリンダ数と同じである。 One end of the fuel gas branch pipe 12 is connected to the fuel gas main pipe 11 extending along the longitudinal direction of the diesel engine, and the other end (downstream end when supplying the fuel gas) corresponds to each cylinder of the diesel engine. A pipe (high pressure pipe) connected to the accumulator 22 provided, and a gas non-return valve (GNRV) 23 is connected in the middle thereof.
The number of fuel gas branch pipes 12 is the same as the number of cylinders of the diesel engine.
　燃料ガス供給管１３は、その一端（燃料ガス供給時における上流端）が、アキュームレータ２２に接続され、その他端（燃料ガス供給時における下流端）が、ディーゼル機関の各シリンダに対応して設けられたガスインジェクションバルブ（ＧＩＶ）２４に接続された配管（高圧管）であって、その途中には、ガスゲートバルブ（ＧＧＶ）２５が接続されている。
　なお、燃料ガス供給管１３の本数は、各シリンダに対応して設けられたガスインジェクションバルブ２４の数×ディーゼル機関のシリンダ数と同じである。 The fuel gas supply pipe 13 has one end (upstream end at the time of fuel gas supply) connected to the accumulator 22, and the other end (downstream end at the time of fuel gas supply) corresponding to each cylinder of the diesel engine. In addition, a gas gate valve (GGV) 25 is connected to a pipe (high-pressure pipe) connected to the gas injection valve (GIV) 24.
The number of fuel gas supply pipes 13 is the same as the number of gas injection valves 24 provided corresponding to each cylinder × the number of cylinders of the diesel engine.
　燃料ガスパージ系統３は、低圧（例えば、１ＭＰａ：１０ｂａｒ）のイナートガス（本実施形態ではＮ２ガス）をディーゼル機関の各シリンダに導く一本のイナートガス主管３１と、複数本のイナートガス枝管３２と、複数本の第１の戻り管３３と、一本の第２の戻り管３４と、を備えている。 The fuel gas purge system 3 includes a single inert gas main pipe 31 that leads low pressure (for example, 1 MPa: 10 bar) inert gas (N 2 gas in the present embodiment) to each cylinder of the diesel engine, a plurality of inert gas branch pipes 32, A plurality of first return pipes 33 and a single second return pipe 34 are provided.
　イナートガス主管３１は、イナートガス供給源（図示せず）から導かれたイナートガスを、ディーゼル機関の各シリンダに対応して設けられたイナートガス枝管３２の一端（イナートガス供給時における上流端）に導く配管（低圧管）であって、イナートガス枝管３２の一端と接続される部分は、ディーゼル機関の長手方向に沿って延びている。また、ディーゼル機関の長手方向に沿って延びるイナートガス主管３１よりもイナートガス供給源の側に位置するイナートガス主管３１の途中には、上流側からイナートガスバルブ３５、セーフティバルブ（安全弁）３６が接続されている。 The inert gas main pipe 31 is a pipe that leads the inert gas led from an inert gas supply source (not shown) to one end of the inert gas branch pipe 32 provided corresponding to each cylinder of the diesel engine (upstream end when the inert gas is supplied). A portion connected to one end of the inert gas branch pipe 32 extends along the longitudinal direction of the diesel engine. Further, an inert gas valve 35 and a safety valve (safety valve) 36 are connected from the upstream side in the middle of the inert gas main pipe 31 positioned on the inert gas supply source side with respect to the inert gas main pipe 31 extending along the longitudinal direction of the diesel engine. .
　イナートガス枝管３２は、その一端が、ディーゼル機関の長手方向に沿って延びるイナートガス主管３１に接続され、その他端（イナートガス供給時における下流端）が、ディーゼル機関の各シリンダに対応して設けられたアキュームレータ２２に接続された配管（低圧管）であって、その途中には、イナートガスノンリターンバルブ（ＩＧＮＲＶ）３７が接続されている。
　なお、イナートガス枝管３２の本数は、ディーゼル機関のシリンダ数と同じである。 One end of the inert gas branch pipe 32 is connected to an inert gas main pipe 31 extending along the longitudinal direction of the diesel engine, and the other end (downstream end when the inert gas is supplied) is provided corresponding to each cylinder of the diesel engine. An inert gas non-return valve (IGNRV) 37 is connected in the middle of the pipe (low pressure pipe) connected to the accumulator 22.
The number of inert gas branch pipes 32 is the same as the number of cylinders of the diesel engine.
　第１の戻り管３３は、その一端（イナートガス供給時における上流端）が、アキュームレータ２２に接続され、その他端（イナートガス供給時における下流端）が、ガスアキュームレータボックス３８の外側に位置する燃料ガス枝管１２の途中に接続された配管であって、ガスアキュームレータボックス３８と呼ばれる筐体の内側に位置する第１の戻り管３３の途中には、オリフィス３９が接続されている。
　なお、第１の戻り管３３の本数は、ディーゼル機関のシリンダ数と同じである。 One end of the first return pipe 33 (upstream end when supplying inert gas) is connected to the accumulator 22, and the other end (downstream end when supplying inert gas) is the fuel gas branch located outside the gas accumulator box 38. An orifice 39 is connected to the middle of a first return pipe 33 that is connected to the middle of the pipe 12 and is located inside the casing, which is called a gas accumulator box 38.
Note that the number of the first return pipes 33 is the same as the number of cylinders of the diesel engine.
　第２の戻り管３４は、その一端（イナートガス供給時における上流端）が、ディーゼル機関の長手方向に沿って延びる燃料ガス主管１１よりも燃料ガス供給源の側に位置するとともに、シャットオフバルブ２１よりも下流側に位置する燃料ガス主管１１の途中に接続され、その他端（イナートガス供給時における下流端）が、パージライン（図示せず）に接続された配管（低圧管）であって、第２の戻り管３４の途中には、ガスパージバルブ４０が接続されている。 The second return pipe 34 has one end (upstream end when inert gas is supplied) positioned on the fuel gas supply source side of the fuel gas main pipe 11 extending along the longitudinal direction of the diesel engine, and the shutoff valve 21. A pipe (low pressure pipe) connected in the middle of the fuel gas main pipe 11 located on the downstream side and having the other end (downstream end when the inert gas is supplied) connected to a purge line (not shown), A gas purge valve 40 is connected in the middle of the second return pipe 34.
　つぎに、燃料ガス供給時における燃料ガスの流れおよび各バルブの開閉状態を、図２を用いて説明する。
　図２に示すように、燃料ガスは、燃料ガス供給源から燃料ガス主管１１、燃料ガス枝管１２、アキュームレータ２２、および燃料ガス供給管１３を介して各シリンダに供給される。このとき、シャットオフバルブ２１は連続的に開、ガスパージバルブ４０およびイナートガスバルブ３５は連続的に閉とされ、ガスインジェクションバルブ２４およびガスゲートバルブ２５は、図３（ａ）および図３（ｂ）に示すように、間歇的（断続的）に開閉（所定の間隔をあけて開閉）される。 Next, the flow of the fuel gas and the open / closed state of each valve when the fuel gas is supplied will be described with reference to FIG.
As shown in FIG. 2, the fuel gas is supplied from the fuel gas supply source to each cylinder through the fuel gas main pipe 11, the fuel gas branch pipe 12, the accumulator 22, and the fuel gas supply pipe 13. At this time, the shut-off valve 21 is continuously opened, the gas purge valve 40 and the inert gas valve 35 are continuously closed, and the gas injection valve 24 and the gas gate valve 25 are shown in FIGS. 3 (a) and 3 (b). As shown in FIG. 5, the valve is opened and closed intermittently (intermittently).
　ここで、図３（ａ）および図３（ｂ）に示すように、ガスゲートバルブ２５は、ガスインジェクションバルブ２４よりも早く開き、ガスインジェクションバルブ２４よりも遅く閉じるように設定されている。 Here, as shown in FIG. 3A and FIG. 3B, the gas gate valve 25 is set to open earlier than the gas injection valve 24 and close later than the gas injection valve 24.
　つづいて、燃料ガスによるディーゼル機関の運転が終了して、燃料ガス供給系統２に残存する燃料ガスをイナートガスでパージする際の燃料ガスの流れ、イナートガスの流れ、および各バルブの開閉状態、すなわち、イナートガス供給時における燃料ガスの流れ、イナートガスの流れ、および各バルブの開閉状態を、図４を用いて説明する。
　まず、ガスパージバルブ４０が開かれると、図４に示すように、アキュームレータ２２内に残存する燃料ガスは、第１の戻り管３３、燃料ガス枝管１２、燃料ガス主管１１、および第２の戻り管３４を介してパージラインに排出される。 Subsequently, after the operation of the diesel engine with the fuel gas is finished, the flow of the fuel gas when purging the fuel gas remaining in the fuel gas supply system 2 with the inert gas, the flow of the inert gas, and the open / close state of each valve, The flow of the fuel gas, the flow of the inert gas, and the open / close state of each valve when supplying the inert gas will be described with reference to FIG.
First, when the gas purge valve 40 is opened, as shown in FIG. 4, the fuel gas remaining in the accumulator 22 flows into the first return pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return gas. It is discharged to the purge line via the pipe 34.
　図５に示すように、ガスパージバルブ４０が開かれて所定時間経過後（本実施形態では２０秒後）に、ガスゲートバルブ２５の開閉が開始される。すると、燃料ガス供給管１３内に残存する燃料ガスがアキュームレータ２２内に流入し、燃料ガス供給管１３内からアキュームレータ２２内に流入した燃料ガスは、アキュームレータ２２内に残存する燃料ガスとともに、第１の戻り管３３、燃料ガス枝管１２、燃料ガス主管１１、および第２の戻り管３４を介してパージラインに排出される。 As shown in FIG. 5, opening and closing of the gas gate valve 25 is started after the gas purge valve 40 is opened and after a predetermined time has elapsed (20 seconds in the present embodiment). Then, the fuel gas remaining in the fuel gas supply pipe 13 flows into the accumulator 22, and the fuel gas that flows into the accumulator 22 from the fuel gas supply pipe 13 together with the fuel gas remaining in the accumulator 22 is the first. The return pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34 are discharged to the purge line.
　そして、ガスゲートバルブ２５の開閉が開始されて所定時間経過後（本実施形態では３０秒後）には、アキュームレータ２２内に残存する燃料ガスの圧力が、イナートガス供給源からイナートガス主管３１およびイナートガス枝管３２を介してアキュームレータ２２に供給されるイナートガスの圧力よりも下がる。すると、イナートガスノンリターンバルブ３７が開き、イナートガス供給源からイナートガス主管３１およびイナートガス枝管３２を介してアキュームレータ２２にイナートガスが供給され、アキュームレータ２２内、燃料ガス供給管１３内、第１の戻り管３３内、燃料ガス枝管１２内、燃料ガス主管１１内、および第２の戻り管３４内に残存していた燃料ガスがパージラインに排出され、アキュームレータ２２内、燃料ガス供給管１３内、第１の戻り管３３内、燃料ガス枝管１２内、燃料ガス主管１１内、および第２の戻り管３４内がイナートガスで満たされる。 Then, after the opening and closing of the gas gate valve 25 is started and a predetermined time has elapsed (30 seconds in this embodiment), the pressure of the fuel gas remaining in the accumulator 22 is changed from the inert gas supply source to the inert gas main pipe 31 and the inert gas branch. The pressure of the inert gas supplied to the accumulator 22 through the pipe 32 is lowered. Then, the inert gas non-return valve 37 is opened, and the inert gas is supplied from the inert gas supply source to the accumulator 22 through the inert gas main pipe 31 and the inert gas branch pipe 32, and in the accumulator 22, the fuel gas supply pipe 13, and the first return pipe 33. The fuel gas remaining in the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34 is discharged to the purge line, the accumulator 22, the fuel gas supply pipe 13, the first The return gas pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34 are filled with the inert gas.
　なお、パージラインに排出された燃料ガスは、パージラインの下流端に設けられたガス燃焼装置（ＧＣＵ）で燃焼させられる。
　また、このイナートガス供給時には、シャットオフバルブ２１およびガスインジェクションバルブ２４は連続的に閉、イナートガスバルブ３５は連続的に開とされる。 The fuel gas discharged to the purge line is burned by a gas combustion unit (GCU) provided at the downstream end of the purge line.
Further, when supplying the inert gas, the shutoff valve 21 and the gas injection valve 24 are continuously closed, and the inert gas valve 35 is continuously opened.
　本実施形態に係る燃料ガス供給・パージ系統１によれば、燃料ガスによるディーゼル機関の運転が終了して、燃料ガス供給系統２に残存する燃料ガスをイナートガスでパージする際、アキュームレータ２２内に残存する燃料ガスは、第１の戻り管３３、燃料ガス枝管１２、燃料ガス主管１１、および第２の戻り管３４を介してパージラインに排出されることになる。すなわち、アキュームレータ２２内に残存する燃料ガスは、第１の戻り管３３を介して燃料ガス枝管１２に戻され、燃料ガス主管１１および第２の戻り管３４を介してパージラインに排出されることになる。言い換えれば、燃料ガス主管１１および燃料ガス枝管１２が、燃料ガスパージ系統３の一部を兼ねることになる。
　これにより、高圧の燃料ガスが流通する配管（高圧管）の長さを短くして、ガス漏れのリスクを減少させることができる。
　また、本実施形態に係る燃料ガス供給・パージ系統１では、上記特許文献１に記載された発明でシリンダ毎に必要とされた四種類の電磁弁のうち、吹出し弁（ガスブローバルブ）３０およびパージ弁（ガスパージバルブ）３２が不要になる。
　これにより、設備コストおよびランニングコストの削減を図ることができる。 According to the fuel gas supply / purge system 1 according to the present embodiment, when the operation of the diesel engine with the fuel gas is finished and the fuel gas remaining in the fuel gas supply system 2 is purged with the inert gas, the fuel gas supply / purge system 1 remains in the accumulator 22. The fuel gas to be discharged is discharged to the purge line via the first return pipe 33, the fuel gas branch pipe 12, the fuel gas main pipe 11, and the second return pipe 34. That is, the fuel gas remaining in the accumulator 22 is returned to the fuel gas branch pipe 12 via the first return pipe 33 and discharged to the purge line via the fuel gas main pipe 11 and the second return pipe 34. It will be. In other words, the fuel gas main pipe 11 and the fuel gas branch pipe 12 also serve as part of the fuel gas purge system 3.
Thereby, the length of the pipe (high pressure pipe) through which the high-pressure fuel gas flows can be shortened, and the risk of gas leakage can be reduced.
Further, in the fuel gas supply / purge system 1 according to the present embodiment, among the four types of electromagnetic valves required for each cylinder in the invention described in Patent Document 1, a blowout valve (gas blow valve) 30 and The purge valve (gas purge valve) 32 becomes unnecessary.
Thereby, reduction of an installation cost and a running cost can be aimed at.
　さらに、本実施形態に係る燃料ガス供給・パージ系統１によれば、第１の戻り管３３の途中にオリフィス３９が設けられており、アキュームレータ２２内に残存する燃料ガスは、オリフィス３９を通過する際に減圧されることになる。
　これにより、オリフィス３９から下流側に位置する第１の戻り管３３を高圧仕様の配管ではなく、低圧仕様の配管（通常の配管）にすることができる。すなわち、高圧の燃料ガスが流通する配管（高圧管）の長さを短くして、ガス漏れのリスクを減少させることができる。 Furthermore, according to the fuel gas supply / purge system 1 according to the present embodiment, the orifice 39 is provided in the middle of the first return pipe 33, and the fuel gas remaining in the accumulator 22 passes through the orifice 39. At that time, the pressure is reduced.
As a result, the first return pipe 33 located downstream from the orifice 39 can be a low-pressure specification pipe (normal pipe) instead of a high-pressure specification pipe. That is, the length of the pipe (high pressure pipe) through which the high pressure fuel gas flows can be shortened to reduce the risk of gas leakage.
　さらにまた、本実施形態に係る燃料ガス供給・パージ系統１によれば、アキュームレータ２２、ガスノンリターンバルブ２３、ガスゲートバルブ２５、イナートガスノンリターンバルブ３７、およびオリフィス３９が、ガスアキュームレータボックス３８と呼ばれる一つの筐体内に収容されており、この筐体内においてガス漏れが生じた場合でも、漏れ出したガスを筐体内に封じ込めることができ、筐体外の雰囲気を正常（清浄）に保つことができる。 Furthermore, according to the fuel gas supply / purge system 1 according to the present embodiment, the accumulator 22, the gas non-return valve 23, the gas gate valve 25, the inert gas non-return valve 37, and the orifice 39 are referred to as a gas accumulator box 38. Even if a gas leak occurs in the casing, the leaked gas can be contained in the casing, and the atmosphere outside the casing can be kept normal (clean).
　さらにまた、本実施形態に係る燃料ガス供給・パージ系統１によれば、燃料ガスによる運転終了後、ガスゲートバルブ２５が間歇的に開閉される、または連続的に開けられるように設定されているので、ガスインジェクションバルブ２４とガスゲートバルブ２５との間に残存する燃料ガスをイナートガスでパージして、ガスインジェクションバルブ２４とガスゲートバルブ２５との間に位置する燃料ガス供給管１３内をイナートガスで満たすことができる。 Furthermore, according to the fuel gas supply / purge system 1 according to the present embodiment, the gas gate valve 25 is set to be intermittently opened / closed or continuously opened after the operation with the fuel gas is completed. Therefore, the fuel gas remaining between the gas injection valve 24 and the gas gate valve 25 is purged with the inert gas, and the inside of the fuel gas supply pipe 13 positioned between the gas injection valve 24 and the gas gate valve 25 is filled with the inert gas. Can be satisfied.
　本実施形態に係るディーゼル機関は、ガス漏れのリスクを減少させることができ、かつ、設備コストおよびランニングコストの削減を図ることができるディーゼル機関の燃料ガス供給・パージ系統１を具備していることになるので、当該ディーゼル機関の安全性および信頼性を向上させることができて、当該ディーゼル機関の設備コストおよびランニングコストの削減を図ることができる。 The diesel engine according to the present embodiment includes a fuel gas supply / purge system 1 for a diesel engine that can reduce the risk of gas leakage and can reduce equipment costs and running costs. Therefore, the safety and reliability of the diesel engine can be improved, and the equipment cost and running cost of the diesel engine can be reduced.
　本発明の他の実施形態に係るディーゼル機関の燃料ガス供給・パージ系統について、図６を参照しながら説明する。
　本実施形態に係るディーゼル機関の燃料ガス供給・パージ系統６１は、ガスゲートバルブ２５の代わりにフローリミッタ機能と強制開放機能とを備えた逆止弁６２が設けられているという点で上述した実施形態のものと異なる。その他の構成要素については上述した実施形態のものと同じであるので、ここではそれら構成要素についての説明は省略する。
　なお、上述した実施形態と同一の部材には同一の符号を付している。 A fuel gas supply / purge system for a diesel engine according to another embodiment of the present invention will be described with reference to FIG.
The fuel gas supply / purge system 61 of the diesel engine according to the present embodiment is described above in that a check valve 62 having a flow limiter function and a forced opening function is provided instead of the gas gate valve 25. Different from that of form. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.
　逆止弁６２は、ガスインジェクションバルブ２４から燃料ガスが噴射される燃料ガス運転中に、ガスインジェクションバルブ２４が開いたままで故障して閉じなくなり、かつ、シリンダ内（筒内）の圧力がアキュームレータ２２内の圧力よりも下がった際に、アキュームレータ２２内からシリンダ内に漏れ出す（流入する）燃料ガスの流量を制限する（第２の）バルブシート６３と、当該逆止弁６２とガスインジェクションバルブ２４との間に位置する燃料ガス供給管１３内の燃料ガスをアキュームレータ２２側に戻すために、弁体６４を開方向へ強制的に付勢するアクチュエータ（例えば、油圧ピストン）６５と、を備えている。
　なお、図６中の符号６６は、弁体６４を閉方向に付勢する付勢部材（例えば、バネ）を示し、符号６７は、アクチュエータ６５に押圧されて弁体６４とともに移動する弁体６４の一部を示しており、符号６８は、（第１の）バルブシートを示している。 During the fuel gas operation in which the fuel gas is injected from the gas injection valve 24, the check valve 62 fails to close while the gas injection valve 24 is open, and the pressure in the cylinder (in-cylinder) is not accumulator 22. When the pressure falls below the internal pressure, the (second) valve seat 63 that restricts the flow rate of the fuel gas leaking (inflowing) from the accumulator 22 into the cylinder, the check valve 62 and the gas injection valve 24. And an actuator (for example, a hydraulic piston) 65 forcibly urging the valve body 64 in the opening direction in order to return the fuel gas in the fuel gas supply pipe 13 positioned between the valve body 64 and the accumulator 22 side. Yes.
6 indicates a biasing member (for example, a spring) that biases the valve body 64 in the closing direction, and reference numeral 67 indicates a valve body 64 that is pressed by the actuator 65 and moves together with the valve body 64. A reference numeral 68 denotes a (first) valve seat.
　本実施形態に係る燃料ガス供給・パージ系統６１によれば、高価なガスゲートバルブ２５の代わりに安価な逆止弁６２を採用することができ、設備費およびメンテナンス費の低減を図ることができる。
　また、本実施形態に係る燃料ガス供給・パージ系統６１によれば、ガスインジェクションバルブ２４から燃料ガスが噴射される燃料ガス運転中に、ガスインジェクションバルブ２４が開いたままで故障して閉じなくなり、かつ、シリンダ内の圧力がアキュームレータ２２内の圧力よりも下がった際に、アキュームレータ２２内からシリンダ内に漏れ出す燃料ガスの流量が、バルブシート６３によって通路を遮断するため、燃料ガスがシリンダ内に勝手に流入することがない。
　さらに、本実施形態に係る燃料ガス供給・パージ系統６１によれば、アクチュエータ６５で弁体６４の一部６７をシート６３の側に押圧することにより、逆止弁６２とガスインジェクションバルブ２４との間に位置する燃料ガス供給管１３内の燃料ガスをアキュームレータ２２側に戻すことができる。
　その他の作用効果は、上述した実施形態と同じであるので、ここではその説明を省略する。 According to the fuel gas supply / purge system 61 according to the present embodiment, an inexpensive check valve 62 can be employed in place of the expensive gas gate valve 25, and equipment costs and maintenance costs can be reduced. .
Further, according to the fuel gas supply / purge system 61 according to the present embodiment, during the fuel gas operation in which the fuel gas is injected from the gas injection valve 24, the gas injection valve 24 remains open and fails to close, and When the pressure in the cylinder is lower than the pressure in the accumulator 22, the flow rate of the fuel gas leaking from the accumulator 22 into the cylinder blocks the passage by the valve seat 63, so that the fuel gas does not enter the cylinder. Will not flow into.
Furthermore, according to the fuel gas supply / purge system 61 according to the present embodiment, the actuator 65 presses a part 67 of the valve body 64 toward the seat 63, whereby the check valve 62 and the gas injection valve 24 are connected. The fuel gas in the fuel gas supply pipe 13 positioned therebetween can be returned to the accumulator 22 side.
Other functions and effects are the same as those in the above-described embodiment, and thus description thereof is omitted here.
　本発明の別の実施形態に係るディーゼル機関の燃料ガス供給・パージ系統について、図７を参照しながら説明する。
　本実施形態に係るディーゼル機関の燃料ガス供給・パージ系統７１は、逆止弁６２の代わりにフローリミッタ機能と強制開放機能とを備えていない逆止弁７２が設けられているという点で図６を用いて説明した実施形態のものと異なる。その他の構成要素については上述した実施形態のものと同じであるので、ここではそれら構成要素についての説明は省略する。
　なお、上述した実施形態と同一の部材には同一の符号を付している。 A fuel gas supply / purge system for a diesel engine according to another embodiment of the present invention will be described with reference to FIG.
The fuel gas supply / purge system 71 of the diesel engine according to the present embodiment is different from the check valve 62 in that a check valve 72 not provided with a flow limiter function and a forced opening function is provided. It differs from that of the embodiment described with reference to FIG. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.
　逆止弁７２は、弁体６４および付勢部材６６を備え、バルブシート６３、アクチュエータ６５および弁体６４の一部６７は備えていない。 The check valve 72 includes a valve body 64 and an urging member 66, and does not include the valve seat 63, the actuator 65, and a part 67 of the valve body 64.
　本実施形態に係る燃料ガス供給・パージ系統７１によれば、アクチュエータ６５および弁体６４の一部を備えていないより安価な逆止弁７２を採用することができ、設備費およびメンテナンス費のさらなる低減を図ることができる。
　その他の作用効果は、上述した実施形態と同じであるので、ここではその説明を省略する。 According to the fuel gas supply / purge system 71 according to the present embodiment, a cheaper check valve 72 that does not include a part of the actuator 65 and the valve body 64 can be employed, which further increases equipment costs and maintenance costs. Reduction can be achieved.
Other functions and effects are the same as those in the above-described embodiment, and thus description thereof is omitted here.
　なお、本発明は上述した実施形態に限定されるものではなく、適宜必要に応じて変形・変更して実施することもできる。
　例えば、上述した実施形態におけるオリフィス３９は必須の構成要素ではなく、オリフィス３９を設けない構成にすることもできる。 In addition, this invention is not limited to embodiment mentioned above, It can also implement by changing and changing suitably as needed.
For example, the orifice 39 in the above-described embodiment is not an essential component, and the orifice 39 may be omitted.
　また、上述した実施形態では、アキュームレータ２２、ガスノンリターンバルブ２３、ガスゲートバルブ２５、イナートガスノンリターンバルブ３７、およびオリフィス３９が、ガスアキュームレータボックス３８と呼ばれる一つの筐体内に収容されたものを一具体例として挙げて説明したが、本発明はこれに限定されるものではなく、アキュームレータ２２、ガスノンリターンバルブ２３、ガスゲートバルブ２５、イナートガスノンリターンバルブ３７、およびオリフィス３９が、ガスアキュームレータボックス３８と呼ばれる一つの筐体内に収容されていない構成にすることもできる。 In the above-described embodiment, the accumulator 22, the gas non-return valve 23, the gas gate valve 25, the inert gas non-return valve 37, and the orifice 39 are stored in a single housing called a gas accumulator box 38. Although described as a specific example, the present invention is not limited to this. The accumulator 22, the gas non-return valve 23, the gas gate valve 25, the inert gas non-return valve 37, and the orifice 39 are provided in the gas accumulator box 38. It is also possible to adopt a configuration that is not housed in a single casing.
　さらに、上述した実施形態において、逆止弁６２，７２は、ガスアキュームレータボックス３８の外（外部）に配置されているが、本発明はこれに限定されるものではなく、逆止弁６２，７２を、ガスアキュームレータボックス３８の中（内部）に配置するようにしてもよい。 Further, in the above-described embodiment, the check valves 62 and 72 are disposed outside (outside) the gas accumulator box 38, but the present invention is not limited to this, and the check valves 62 and 72 are not limited thereto. May be arranged in (inside) the gas accumulator box 38.
　１　燃料ガス供給・パージ系統
　２　燃料ガス供給系統
　３　燃料ガスパージ系統
１１　燃料ガス主管
１２　燃料ガス枝管
１３　燃料ガス供給管
２１　シャットオフバルブ
２２　アキュームレータ
２３　ガスノンリターンバルブ
２４　ガスインジェクションバルブ
２５　ガスゲートバルブ
３１　イナートガス主管
３２　イナートガス枝管
３３　第１の戻り管
３４　第２の戻り管
３７　イナートガスノンリターンバルブ
３８　ガスアキュームレータボックス（筐体）
３９　オリフィス DESCRIPTION OF SYMBOLS 1 Fuel gas supply / purge system 2 Fuel gas supply system 3 Fuel gas purge system 11 Fuel gas main pipe 12 Fuel gas branch pipe 13 Fuel gas supply pipe 21 Shutoff valve 22 Accumulator 23 Gas non-return valve 24 Gas injection valve 25 Gas gate valve 31 Inert gas main pipe 32 Inert gas branch pipe 33 First return pipe 34 Second return pipe 37 Inert gas non-return valve 38 Gas accumulator box (housing)
39 Orifice

Claims (5)

  1. 　高圧噴射によって、燃料油および燃料ガスの両方、または燃料ガスを燃焼させることができるディーゼル機関に適用される、ディーゼル機関の燃料ガス供給・パージ系統であって、
    　燃料ガス供給源から導かれた燃料ガスを、前記ディーゼル機関の各シリンダに対応して設けられた燃料ガス枝管の一端に導く一本の燃料ガス主管と、その一端が、前記ディーゼル機関の長手方向に沿って延びる前記燃料ガス主管に接続され、その他端が、前記ディーゼル機関の各シリンダに対応して設けられたアキュームレータに接続された複数本の燃料ガス枝管と、その一端が、前記アキュームレータに接続され、その他端が、前記ディーゼル機関の各シリンダに対応して設けられたガスインジェクションバルブに接続された燃料ガス供給管と、を備えた燃料ガス供給系統と、
    　イナートガス供給源から導かれたイナートガスを、前記ディーゼル機関の各シリンダに対応して設けられたイナートガス枝管の一端に導く一本のイナートガス主管と、その一端が、前記ディーゼル機関の長手方向に沿って延びる前記イナートガス主管に接続され、その他端が、前記アキュームレータに接続された複数本のイナートガス枝管と、その一端が、前記アキュームレータに接続され、その他端が、前記燃料ガス枝管の途中に接続された第１の戻り管と、その一端が、前記ディーゼル機関の長手方向に沿って延びる前記燃料ガス主管よりも前記燃料ガス供給源の側に位置するとともに、前記燃料ガス主管の途中に接続されたシャットオフバルブよりも下流側に位置する前記燃料ガス主管の途中に接続され、その他端が、パージラインに接続された第２の戻り管と、を備えた燃料ガスパージ系統と、を備え、
    　前記燃料ガス枝管の途中にガスノンリターンバルブが、前記燃料ガス供給管の途中にガスゲートバルブが、前記イナートガス枝管の途中にイナートガスノンリターンバルブが設けられているディーゼル機関の燃料ガス供給・パージ系統。     A diesel engine fuel gas supply and purge system applied to a diesel engine capable of burning both fuel oil and fuel gas or fuel gas by high pressure injection,
    One fuel gas main pipe for guiding the fuel gas led from the fuel gas supply source to one end of a fuel gas branch pipe provided corresponding to each cylinder of the diesel engine, A plurality of fuel gas branch pipes connected to the fuel gas main pipe extending in the direction and having the other end connected to an accumulator provided corresponding to each cylinder of the diesel engine, and one end thereof being the accumulator A fuel gas supply system, the other end of which is connected to a gas injection valve provided corresponding to each cylinder of the diesel engine, and a fuel gas supply system comprising:
    One inert gas main pipe for guiding the inert gas introduced from the inert gas supply source to one end of an inert gas branch pipe provided corresponding to each cylinder of the diesel engine, and one end thereof along the longitudinal direction of the diesel engine A plurality of inert gas branch pipes connected to the extending inert gas main pipe and having the other end connected to the accumulator, one end thereof connected to the accumulator, and the other end connected to the fuel gas branch pipe. The first return pipe and one end thereof are located on the fuel gas supply source side of the fuel gas main pipe extending along the longitudinal direction of the diesel engine, and are connected to the fuel gas main pipe in the middle. Connected in the middle of the fuel gas main pipe located downstream from the shutoff valve, the other end is connected to the purge line. Comprising a second return pipe that is continued, and the fuel gas purge system having a a,
    A fuel gas supply for a diesel engine having a gas non-return valve in the middle of the fuel gas branch pipe, a gas gate valve in the middle of the fuel gas supply pipe, and an inert gas non-return valve in the middle of the inert gas branch pipe Purge system.
  2. 　前記第１の戻り管の途中にオリフィスが設けられている請求項１に記載のディーゼル機関の燃料ガス供給・パージ系統。 The fuel gas supply / purge system for a diesel engine according to claim 1, wherein an orifice is provided in the middle of the first return pipe.
  3. 　前記アキュームレータ、前記ガスノンリターンバルブ、前記ガスゲートバルブ、前記イナートガスノンリターンバルブ、および前記オリフィスが、一つの筐体内に収容されている請求項２に記載のディーゼル機関の燃料ガス供給・パージ系統。 3. The fuel gas supply / purge system for a diesel engine according to claim 2, wherein the accumulator, the gas non-return valve, the gas gate valve, the inert gas non-return valve, and the orifice are accommodated in one casing.
  4. 　燃料ガスによる運転終了後、前記ガスゲートバルブが間歇的に開閉される、または連続的に開けられるように設定されている請求項１から３のいずれか一項に記載のディーゼル機関の燃料ガス供給・パージ系統。 The fuel gas supply of the diesel engine according to any one of claims 1 to 3, wherein the gas gate valve is set to be intermittently opened or closed or continuously opened after the operation with the fuel gas is finished.・ Purge system.
  5. 　請求項１から４のいずれか一項に記載のディーゼル機関の燃料ガス供給・パージ系統を具備しているディーゼル機関。 A diesel engine provided with the fuel gas supply / purge system of the diesel engine according to any one of claims 1 to 4.
PCT/JP2013/069663 2012-09-26 2013-07-19 Fuel gas supply and purge system for diesel engine WO2014050269A1 (en)

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CN201380030308.4A CN104350259B (en) 2012-09-26 2013-07-19 The fuel gas supply of diesel engine, fuel gas discharge system
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