FI130532B - Dual-fuel engine and method for operating the same - Google Patents

Dual-fuel engine and method for operating the same Download PDF

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Publication number
FI130532B
FI130532B FI20185370A FI20185370A FI130532B FI 130532 B FI130532 B FI 130532B FI 20185370 A FI20185370 A FI 20185370A FI 20185370 A FI20185370 A FI 20185370A FI 130532 B FI130532 B FI 130532B
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FI
Finland
Prior art keywords
fuel
dual
engine
pumps
operating mode
Prior art date
Application number
FI20185370A
Other languages
Finnish (fi)
Swedish (sv)
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FI20185370A1 (en
FI20185370A (en
Inventor
Ludwig Maier
Johann Wloka
Gerold Wassermann
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Man Energy Solutions Se
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Publication of FI20185370A1 publication Critical patent/FI20185370A1/en
Publication of FI20185370A publication Critical patent/FI20185370A/en
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Publication of FI130532B publication Critical patent/FI130532B/en

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Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F02B69/04—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel for gaseous and non-gaseous 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
    • 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
    • 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
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0684—High pressure fuel injection systems; Details on pumps, rails or the arrangement of valves in the fuel supply and return systems
    • 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
    • F02M21/04—Gas-air mixing apparatus
    • 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
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • 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
    • F02D19/0647—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 the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • 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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A dual-fuel engine (23) comprising multiple cylinders (2), wherein in a liquid fuel operating mode of the dual-fuel engine (23) liquid fuel for combusting the same can be supplied to a combustion chamber (9) of the cylinders (2) via a fuel supply apparatus (24) comprising multiple fuel pumps (25a, 25b, 25c), and wherein in a gas fuel operating mode of the dual-fuel engine (23) the combustion chamber (9) of the cylinders (2) can be supplied on the one hand for gaseous fuel for combusting the same and on the other hand with ignition fluid for igniting the same, wherein the fuel supply apparatus (24) for the liquid fuel in the gas fuel operating mode of the dual-fuel engine (23) supplies the ignition fluid to the combustion chamber (9) of the cylinders (2) in such a manner that the fuel pumps (25a, 25b, 25c) alternately deliver the ignition fluid.

Description

Dual-fuel engine and method for operating the same
The invention relates to a dual-fuel engine. The invention, furthermore, relates to a method for operating a dual-fuel engine.
From practice, dual-fuel engines are known in which on the one hand a liquid fuel such as diesel and on the other hand a gaseous fuel such as natural gas can be combusted. In the gas mode of a dual-fuel engine, a lean gas-air mixture is usually introduced into the cylinders of the engine and ignited by the ignition energy of an ignition fluid likewise introduced into the cylinders.
Assemblies of a dual-fuel engine 1 known from the prior art are shown in Fig. 1, wherein Fig. 1 shows a cylinder 2 of such a dual-fuel engine 1. The cylinder 2 comprises a cylinder head 3. In the cylinder, a piston 4, which is guided by a connecting rod 5, moves up and down. In the cylinder head, a fuel injector 6 is fastened, by way of which liguid fuel, in particular diesel fuel, via a fuel line 7 from a fuel pump 8, can be injected into a combustion chamber 9 of the cylinder 2. The fuel injector 6, the fuel line 7 and the fuel pump 8 are elements of a fuel supply apparatus which serves for supplying liquid fuel into the combustion chamber 9 of the cylinder 2. This fuel supply apparatus is activated in particular when in the cylinder 2 of the dual-fuel engine liguid fuel, in particular diesel, is combusted as fuel. For combusting the liguid fuel, charge air 10 can be additionally introduced @ into the respective cylinder 2 of the dual-fuel engine 1 via an inlet valve 17,
N 25 wherein exhaust gas 5 developing during the combustion of the fuel can be 5 discharged from the respective cylinder 2 of the dual-fuel engine 1 via an exhaust ™ valve 18. j o In the combustion chamber 9 of the cylinder 2 of the dual-fuel engine 1, a gas can 3 30 be alternatively combusted as fuel in another operating mode. To this end, the
O dual-fuel engine 1 comprises a mixture forming unit 20, in which a mixture of combustion air 10 and gas, which is provided to the mixture forming unit 20 via a gas supply line 21, is formed, wherein this gas-air mixture is introduced into the combustion chamber 9 of the cylinder 2 via the inlet valve 17. During the combustion of gases exhaust gas 15 also develops which can be discharged from the cylinder 2 via the exhaust valve 18. An ignition fluid, which can be introduced into a further combustion chamber 11 of the cylinder 2 with the help of an ignition fluid injector 13, serves for igniting the gas-air mixture in the gas mode of the dual- fuel engine 1, wherein this further combustion chamber 11 of the cylinder 2 is coupled to the combustion chamber 9 via at least one connecting channel 12.
Alternatively, the ignition fluid can also be directly introduced into the combustion chamber 9. The ignition fluid injector 13 of the cylinder 2 shown in Fig. 1 is a part of an ignition fluid injection system of the dual-fuel engine, wherein the ignition fluid injection system for each cylinder 2 of the dual-fuel engine 1 comprises an individual ignition fluid injector 13. Starting out from a common ignition fluid storage unit 22 of the ignition fluid injection system, the ignition fluid injectors 13 can be supplied with ignition fluid via an ignition fluid line 14, wherein the ignition fluid storage unit 22 is assigned an ignition fluid delivery pump 16, which supplies the ignition fluid storage unit 22 with ignition fluid. The ignition fluid delivery pump 16 is preferentially an electrically operated high-pressure pump. Here, the ignition fluid delivery pump 16 is assigned a suction choke 19.
Accordingly, on the one hand, a dual-fuel engine 1 known from practice comprises the fuel supply apparatus for supplying the liquid fuel in the liquid fuel mode of the dual-fuel engine 1 while on the other hand a dual-fuel engine 1 known from practice comprises a separate ignition fluid injection system in order to introduce @ the ignition fluid into the cylinders 2 of the dual-fuel engine 1 in the fuel mode of
N 25 — the dual-fuel engine 1 for combusting the gaseous fuel. 5 ™ Accordingly, a dual-fuel engine known from practice comprises two injection
E systems, namely the fuel supply apparatus for the liguid fuel and the ignition fluid o injection system. This reguires a complex construction of dual-fuel engines. There 3 30 is therefore a need for a new dual-fuel engine with a simpler construction and for a
O method for operating the same.
Starting out from this, the invention is based on the object of creating a new type of dual-fuel engine and a method for operating a dual-fuel engine. This object is solved by a dual-fuel engine according to Claim 1. According to the invention, the fuel supply apparatus for the liquid fuel supplies the combustion chamber of the cylinders with the liquid fuel in the gas fuel operating mode of the dual-fuel engine in such a manner that fuel pumps of the fuel supply apparatus alternately deliver the ignition fluid.
With the dual-fuel engine according to the invention, the fuel supply apparatus, i.e. the injection system for the liquid fuel, additionally assumes the task of supplying the ignition fluid to the cylinders of the dual-fuel engine in the gas mode of the dual-fuel engine. A separate ignition fluid injection system, which is required with dual-fuel engines known from practice, can be omitted according to the invention.
This reduces the complexity of the dual-fuel engine and the same can be produced simpler and more cost-effectively. Of the fuel pumps of the fuel supply apparatus, not all are simultaneously active in the gas mode of the dual-fuel engine in order to supply the ignition fluid to the cylinders, but the fuel supply apparatus for the liquid fuel rather supplies the ignition fluid to the combustion chamber of the cylinders in the gas mode of the dual-fuel engine in such a manner that the fuel pumps of the fuel supply apparatus alternately deliver the ignition fluid in the direction of the cylinders. Fuel pumps which do not currently deliver in the gas mode are shut down in the gas mode. Because of this there is no risk that the fuel pumps of the fuel supply apparatus, which with respect to their rate of delivery @ are designed for large quantities of a liquid fuel, do not overheat and thus become
N 25 damaged when delivering small ignition fluid quantities in the gas mode of the 5 dual-fuel engine. ™
E Preferentially, the fuel pumps are embodied as pumps in particular plug-in pumps, o which are driven by a camshaft of the dual-fuel engine, wherein each fuel pump is 3 30 assigned an adjustable choke which is adjustable for adjusting the rate of delivery
O of the respective fuel pump. This makes possible a particularly simple construction of the dual-fuel engine.
Preferentially, the fuel supply apparatus is designed as common rail fuel supply apparatus. The invention relates to a dual-fuel engine and to a method for operating such a dual-fuel engine. In particular when the fuel supply apparatus is embodied as common rail fuel supply apparatus, the liquid fuel of the dual-fuel engine and the ignition fluid of the dual-fuel engine can be advantageously delivered in the direction of the cylinders of the dual-fuel engine in the liquid fuel operating mode and in the gas fuel operating mode respectively and introduced into the combustion chamber of the same.
The method for operating a dual-fuel engine is defined in Claim 6.
Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail by way of the drawing without being restricted to this. It shows:
Fig. 1 a block diagram of a dual-fuel engine according to the prior art;
Fig. 2 a block diagram of a dual-fuel engine according to the invention.
Fig. 2 shows assemblies of a dual-fuel engine 23 according to the invention, wherein Fig. 1 shows a cylinder 2 of such a dual-fuel engine 23. @ The cylinder 2 shown in Fig. 1 comprises a cylinder head 3. In the cylinder head 3,
N 25 a piston 4 can move up and down wherein the piston 4 is guided by a connecting 5 rod 5. ™ z The cylinder 2 comprises a combustion chamber 9. In the liquid fuel mode of the o dual-fuel engine 23, a liguid fuel is introduced into the combustion chamber 9 of 3 30 the cylinder 2, namely with the help of the fuel supply apparatus 24 shown in Fig.
O 2, which is a common rail fuel supply apparatus. The common rail fuel supply apparatus 24 comprises for each cylinder 2 of the dual-fuel engine 23 at least one fuel injector 28, via which in the liguid fuel mode the liguid fuel can be introduced into the combustion chamber 9 of the respective cylinder 2. Of the common rail fuel supply apparatus 24, multiple fuel pumps 25a, 25b and 25c embodied as high- pressure fuel pumps are shown, furthermore, which starting out from a low- pressure region of the common rail fuel supply apparatus deliver fuel into a high- 5 pressure region of the same, namely into a pressure accumulator system 26 of the common rail fuel supply apparatus 24. Starting out from the pressure accumulator system 26, the liquid fuel can be supplied to the injectors 28 of the cylinders 2 via high-pressure fuel lines 29. According to Fig. 2, each high-pressure fuel pump 25a, 25b and 25c of the common rail fuel supply apparatus 24 is assigned an adjustable choke 27a, 27b, 27c.
In the liquid fuel mode, the liquid fuel, which is introduced into the cylinders 2 via the fuel supply apparatus 24, is combusted, wherein for this purpose charge air 10 is additionally supplied to the cylinders 2 via a suitable inlet valve 17 of the respective cylinder 2. Exhaust gas, which develops during the combustion of the liquid fuel, can be discharged from the combustion chamber 9 of the respective cylinder 2 via an exhaust valve 18.
In a gas fuel operating mode of the dual-fuel engine 23, a gaseous fuel can be supplied to the combustion chamber 9 of the cylinder 2 for combustion, namely a mixture of combustion air 10 and gas, which is formed in a mixture forming unit 20.
The gas is provided to the mixture forming unit 20 via a gas supply line 21. The gas-air mixture enters the combustion chamber 9 of the respective cylinder 2 via @ the inlet valve 17, wherein exhaust gas 15 developing during the combustion of
N 25 the gas can be discharged from the cylinder 2 via the exhaust valve 18. 5 ™ Ignition fluid serves for igniting the gas-air mixture in the gas fuel mode of the dual-
E fuel engine 23. In the dual-fuel engine 23 according to the invention, the fuel o supply apparatus 24 for the liguid fuel also supplies the combustion chamber 9 of 3 30 the cylinder 2 with the ignition fluid in the gas fuel operating mode of the dual-fuel
O engine 23. The fuel supply apparatus 24 of the dual-fuel engine 23 embodied as common rail fuel supply apparatus accordingly serves for supplying liguid fuel into the combustion chamber 9 of the cylinders 2 in the liguid fuel mode and for supplying ignition fluid into the combustion chamber 9 of the cylinders 2 in the gas fuel mode. Separate injection systems for liquid fuel and ignition fluid are accordingly dispensed with with the dual-fuel engine 23 according to the invention.
In order to avoid that the high-pressure fuel pumps 25a, 25b and 25c, which are designed for delivering relatively large quantities of liquid fuel in the liquid fuel operating mode of the dual-fuel engine 23 overheat when delivering small ignition fluid quantities in the gas fuel operating mode, the fuel supply apparatus 24 supplies the ignition fluid to the combustion chamber 9 of the cylinders in the gas fuel operating mode in such a manner that the high-pressure fuel pumps 25a, 25b, 25c alternately deliver the ignition fluid. Accordingly, the high-pressure fuel pumps 25a, 25b, 25c do not run simultaneously in the gas fuel operating mode, but alternately.
The high-pressure fuel pumps 25a, 25b and 25c are pumps which are driven starting from a camshaft (not shown) of the dual-fuel engine 23. As already explained, each high-pressure fuel pump 25a, 25b, 25c is assigned an adjustable choke 27a, 27b, 27c, which are adjustable for adjusting the rate of delivery of the respective high-pressure fuel pump 25a, 25b, 25c.
In the gas fuel mode of the dual-fuel engine 23, the high-pressure fuel pumps 25a, 25b, 25c are also driven starting from the camshaft and a rotational speed dependent thereon, while the rate of delivery is adjusted via the chokes 27a, 27b, @ 27c. Here, the chokes 27a, 27b, 27c for providing relatively small ignition fluid
N 25 rates of delivery are closed relatively far in the gas fuel operating mode so that the 5 respective high-pressure fuel pump 25a, 25b, 25c then delivers relatively little ™ ignition fluid so that per se there is the risk that as a consequence of the small
E ignition fluid rates of delivery the respective high-pressure fuel pump 25a, 25b, 25c o overheats. Since however the high-pressure fuel pumps 25a, 25b, 25c according 3 30 to the invention do not run simultaneously in the gas fuel operating mode but
T rather alternately deliver the ignition fluid, there is no overheating risk for the high- pressure fuel pumps 25a, 25b, 25c in the gas fuel operating mode. The high- pressure fuel pumps 25a, 25b, 25c are preferentially so-called plug-in pumps.
Accordingly, with the dual-fuel engine 23 according to the invention, the delivery of the fuel injection quantity for the liquid fuel in the liquid fuel operating mode and the injection quantity for the ignition fluid in the gas fuel operating mode accordingly takes place via one and the same injection system, namely via the common rail fuel supply apparatus 24. The respective rate of delivery required is adjusted via the adjustable chokes 27a, 27b, 27c assigned to the fuel pumps 25a, 25b, 25c.
In order to avoid overheating of the high-pressure fuel pumps 25a, 25b, 25c in the case of reduced rate of delivery of the high-pressure fuel pumps 25a, 25b, 25c in the gas fuel operating mode, the delivery of the ignition fluid is realised alternately via the high-pressure fuel pumps 25a, 25b, 25c. Accordingly, each high-pressure fuel pump 25a, 25b, 25c merely runs for a defined time interval following which the same is stopped and another one of the high-pressure fuel pumps 25a, 25b, 25c operated for a defined time interval. High-pressure fuel pumps 25a, 25b, 25c which in the gas fuel operating mode do not currently deliver any ignition fluid are shut down in the gas fuel operating mode. Accordingly, only that particular high- pressure fuel pump 25a or 25b or 25c that is currently delivering the ignition fluid runs in the gas fuel operating mode at any one time. By contrast, all other high- pressure fuel pumps 25b and 25c or 25a and 25c or 25a and 25b are shut down.
In the gas fuel operating mode, the high-pressure fuel pumps 25a, 25b, 25c in terms of such an interval switching and at idle can run in any order, e]
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Claims (6)

Claims
1. A dual-fuel engine (23), comprising multiple cylinders (2), wherein in a liquid fuel operating mode of the dual-fuel engine (23) a combustion chamber (9) of the cylinders (2) can be supplied with liquid fuel for combusting the same via a fuel supply apparatus (24) comprising multiple fuel pumps (25a, 25b, 25c), and wherein in a gas fuel operating mode of the dual-fuel engine (23) the combustion chamber (9) of the cylinders (2) can be supplied on the one hand with gaseous fuel for combustion of the same and on the other hand ignition fluid for igniting the same, characterized in that the fuel supply apparatus (24) for the liquid fuel in the gas fuel operating mode of the dual- fuel engine (23) supplies the ignition fluid to the combustion chamber (9) of the cylinders (2) in such a manner that the fuel pumps (25a, 25b, 25c) alternately deliver the ignition fluid, and in that the fuel pumps (25a, 25b, 25c) are embodied as pumps which can be driven starting from a camshaft of the dual-fuel engine (23), wherein each fuel pump (25a, 25b, 25c) is assigned an adjustable choke (27a, 27b, 27c) which is adjustable for adjusting the rate of delivery of the respective fuel pump (25a, 25b, 25c)..
2. The dual-fuel engine according to Claim 1, characterized in that the fuel pumps (25a, 25b, 25c) are embodied as plug-in pumps. S N 25
3. The dual-fuel engine according to Claims 1 or 2, characterized in that the 5 fuel pumps (25a, 25b, 25c) are high-pressure fuel pumps of a common rail ™ fuel supply apparatus (24). j o
4. The dual-fuel engine according to any one of the Claims 1 to 3, 3 30 characterized in that fuel pumps (25a, 25b, 25c), which in the gas fuel O operating mode do not currently deliver any ignition fluid, are at idle in the gas fuel operating mode.
5. A method for operating a dual-fuel engine (23) comprising multiple cylinders, wherein in a liquid fuel operating mode of the dual-fuel engine (23) a combustion chamber (9) of the cylinders (2) can be supplied with liquid fuel for combusting the same via a fuel supply apparatus (24) comprising multiple fuel pumps (25a, 25b, 25c), and wherein in a gas fuel operating mode of the dual-fuel engine (23) the combustion chamber (9) of the cylinders (2) can be supplied on the one hand with gaseous fuel for combusting the same and on the other hand ignition fluid for igniting the same, characterized in that the fuel supply apparatus (24) for the liquid fuel in the gas fuel operating mode of the dual-fuel engine (23) supplies the ignition fluid to the combustion chamber (9) of the cylinders (2) in such a manner that the fuel pumps (25a, 25b, 25c) of the same alternately deliver the ignition fluid, and in that fuel pumps (25a, 25b, 25c) are driven starting from a camshaft of the dual-fuel engine (23), wherein the rate of delivery of the respective fuel pump (25a, 25b, 25c) is adjusted via a choke (27a, 27b, 27c) assigned to the same.
6. The method according to Claim 5, characterized in that fuel pumps (25a, 25b, 25c), which in the gas fuel operating mode do not currently deliver any ignition fluid, are shut down in the gas fuel operating mode. e] N O N N S ™ I = O K 0 LO 00 O N
FI20185370A 2017-05-15 2018-04-19 Dual-fuel engine and method for operating the same FI130532B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017208160.0A DE102017208160A1 (en) 2017-05-15 2017-05-15 Dual-fuel engine and method of operating the same

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Publication Number Publication Date
FI20185370A1 FI20185370A1 (en) 2018-11-16
FI20185370A FI20185370A (en) 2018-11-16
FI130532B true FI130532B (en) 2023-11-03

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