GB2058211A - Diesel engine fuel-mixing system - Google Patents

Diesel engine fuel-mixing system Download PDF

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Publication number
GB2058211A
GB2058211A GB7931714A GB7931714A GB2058211A GB 2058211 A GB2058211 A GB 2058211A GB 7931714 A GB7931714 A GB 7931714A GB 7931714 A GB7931714 A GB 7931714A GB 2058211 A GB2058211 A GB 2058211A
Authority
GB
United Kingdom
Prior art keywords
engine
fuel
mixing
grade
fuel oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7931714A
Other versions
GB2058211B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Showa Line Ltd
Original Assignee
Showa Line Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Showa Line Ltd filed Critical Showa Line Ltd
Priority to GB7931714A priority Critical patent/GB2058211B/en
Publication of GB2058211A publication Critical patent/GB2058211A/en
Application granted granted Critical
Publication of GB2058211B publication Critical patent/GB2058211B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4322—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa essentially composed of stacks of sheets, e.g. corrugated sheets
    • 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
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • 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
    • F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
    • F02D19/0657—Heavy or light fuel oils; Fuels characterised by their impurities such as sulfur content or differences in grade, e.g. for ships
    • 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
    • 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
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F02B2201/00—Fuels
    • F02B2201/06—Dual fuel applications
    • F02B2201/062—Liquid and liquid
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/16—Other apparatus for heating fuel
    • 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
    • F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
    • 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
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
    • 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)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

An overhead fuel tank 3 gravity feeds marine diesel fuel oil to an engine 1, and a pump 15 feeds heavier fuel oil from a supply 10 to the engine. An inlet to a mixer 27 is connected, via a pipe 41, to the outlet of the tank 1 and via pipe 16 to the pump 15. An outlet from the mixer leads to the inlet to the engine. A flow control valve 17 which regulates the flow of the heavy fuel oil to the mixer is controlled by a device 21 which receives flow rate signals from sensors 19, 20 and a mixing-ratio setter 22. <IMAGE>

Description

SPECIFICATION Diesel engine fuel system This invention relates to an improved dieselengine fuel system and, more specifically, relates to a mixed-fuel supply system.
For operation of large-sized diesel engines, such as for electrical generation in ships, heavy fuel oil is not suitable, but marine diesel oil is too good and too expensive. Therefore, it is more economical to supply this type of engine with a mixed fuel oil of these two fuels.
Various types of mixed-fuel have now been proposed including systems having two variabledelivery feed pumps, one for marine diesel oil and the other for heavy fuel oil, a mixer and a tank from which mixed oil is fed to the engine.
However, these existing systems have the disadvantage that the failure of the marine diesel oil pump will cause the supply of pure heavy fuel oil to the engine, and thus serious damage thereto may follow. Another disadvantage is that the storage of mixed fuel in the tank produces a considerable amount of sludge therein.
According to the invention there is provided a fuel system for feeding higher-grade and lowergrade fuel oils simultaneously to a diesel engine, said system comprising a tank mounted higher than the engine so as to permit the gravity feed of the higher-grade fuel oil from the tank to the engine, a pump for feeding the lower-grade fuel oil from a source thereof to the engine, means for mixing the fuel oils together, said mixing means having an inlet connected to both said tank and a discharge side of said pump, an outlet from said mixing means being connected to the engine, and valve means for regulating flow of the lower-grade fuel oil to the engine.
This arrangement eliminates the need for a mixed-oil tank. The mixed fuel oil is directly sent to the engine, as a result, the direct feed prevents sludge formation. The overhead tank permits gravity feed of the higher-grade fuel to the engine, which insures safe operation of the engine in the event of a pump failure. The flow control valve allows the ratio between their flow rates to be adjusted freely.
The flow control valve is preferably provided with a feedback control, which maintains the flow ratio at the desired value under various conditions.
In a preferred embodiment, the mixer comprises a tubular housing forming a fluid passage and stationary mixing elements therein.
Because this mixer has no moving parts it enables the system to have greater reliability.
The invention will now be further described, by way of example, with reference to the accompanying drawings in which: Fig. 1 is a schematic diagram of a fuel system formed according to the invention; Fig. 2 is a partially cutaway view of a mixer incorporated in the system shown in Fig. 1, and Fig. 3 is an enlarged isometric view of one component of the mixer shown in Fig. 2.
Referring now to the drawings, in Fig. 1, there is shown a mixed-fuel supply system for a diesel engine 1, which is a prime mover for electrical generation and placed in a machinery space of a ship with a main engine 2 for propulsion.
An overhead tank 3 is mounted above the engine, and contains marine diesel oil pumped thereto from a main tank (not shown). The bottom of the tank 3 is connected to the fuel inlet of the engine 1 by both pipes 4 and 5 with valves 6 and 7 and a pipe 8 with a valve 9. Normally, the valves 6 and 7 are kept open and the valve 9 closed. The pipe 8 is used to send marine diesel oil directly to the engine 1, as in starting the engine.
An overhead tank 1 0 mounted higher than the main engine 2 contains heavy fuel oil pumped thereto from a main tank (not shown). The tank 10 is provided with a steam-heating coil 11 therein for reducing the viscosity of the heavy fuel oil. The tank 10 is connected by a pipe 12 to the fuel inlet of the main engine 2, to which the heavy fuel oil flows down under the action of gravity.
A pipe 13 branching off from the pipe 12 leads through a valve 14 into a centrifugal pump 15, the discharge side of which is connected to the pipe 5 bye pipe 16.
Flow control valves 1 7 and 1 8 are connected in parallel on the pipe 1 6. The valve 1 8 is for emergency use, and normally is kept closed. The valve 1 7 is of the air driven type, and is provided with a feedback control, which consists of flow transmitters 19 and 20, controlling circuit 21 with a mixing-ratio setter 22, and a pressure converter 23. The flow rates of the fuels in the pipes 4 and 1 6 are measured by the flow transmitters 1 9 and 20, and fed back to the controlling circuit 21. The circuit 21 compares the ratio between the measured flow rates with the set point (desired value) inputted by the mixing-ratio setter 22, and delivers a control signal.According to the strength of the signal, the converter 23 controls the pressure of compressed air sent through a pipe 24, and this controlled air is applied to the diaphragm of the valve 1 7 through a pipe 25. The valve 1 7 therefore, is actuated in such a manner that the flow ratio is at the desired value under various conditions. The above-described elements and the controlling circuit 21 maybe elements and circuits found in the prior art.
An oil heater 26 for reducing the viscosity of the fuel oil and a mixer 27 are on the pipe 5.
The mixer 27, in the preferred embodiment, includes a tubular housing 28 (partially broken away in Fig. 2) forming a fluid passage with annular coupling flanges 29 at each end and a plurality of stationary mixing elements 30 therein.
Each of the mixing elements is made up of a plurality of corrugated sheets 31 of metal stacked rigidly with their ridges at right angles to one another. The tortuous paths formed between the sheets 31 produce turbulent flow of fluid. The mixing elements 30 are placed in the housing with their sheets 31 at right angles to one another, so that divisions of the fluid take place at the upstream end of each of the mixing elements.
Thus, by this division and the formation of the turbulent flow the fuel oils passing through the mixer are turned into a homogeneously mixed oil.
In operation, the marine diesel oil in the overhead tank 3 flows down under the action of gravity through the pipes 4 and 5 into the engine 1. The pump 15 sends the heavy fuel oil from the tank 10 through the pipes 12, 13, 16 and 5 to engine 1. On the way to the engine, the fuel oils meet in the pipe 5 and flow together through the oil heater 26 and the mixer 27, both of which turn them into a homogeneous mixed fuel oil with suitable viscosity. This mixed fuel oil flows into the engine 1 and is burned. The mixing ratio of the mixed fuel oil is maintained at the desired value by the flow control valve 1 7 with a feedback control.

Claims (7)

1. A fuel system for feeding higher-grade and lower-grade fuel oils simultaneously to a diesel engine, said system comprising a tank mounted higher than the engine so as to permit the gravity feed of the higher-grade fuel oil from the tank to the engine, a pump for feeding the lower-grade fuel oil from a source thereof to the engine, means for mixing the fuel oils together, said mixing means having an inlet connected to both said tank and a discharge side of said pump, an outlet from said mixing means being connected to the engine, and valve means for regulating flow of the lowergrade fuel oil to the engine.
2. A fuel system as claimed in claim 1, wherein said mixing means comprises a tubular housing forming a fluid passage, and a plurality of stationary mixing elements in said housing for mixing the fluid flowing through the passage.
3. A fuel system as claimed in claim 2, wherein each mixing element is formed of a plurality of corrugated sheets stacked rigidly with their ridges at right angles to one another, and said mixing elements are disposed with their corrugated sheets at right angles to one another.
4. A fuel system as claimed in claim 1 , wherein said valve means is provided with a feedback control comprising flow transmitters responding to the flow rate of each of the fuel oils, and a controller responding to said flow transmitter for operating said valve means so as to maintain the ratio between their flow rates at a desired value.
5. A fuel system as claimed in claim 1, comprising means for heating the fuel oils connected in series with said mixing means.
6. A fuels system for feeding higher-grade and lower-grade fuel oils simultaneously to a diesel engine, substantially as hereinbefore described with reference to the accompanying drawings.
7. A ship provided with a diesel engine and a system to feed fuel oil to the engine as claimed in any of claims 1 to 6.
GB7931714A 1979-09-13 1979-09-13 Diesel engine fuel-mixing system Expired GB2058211B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7931714A GB2058211B (en) 1979-09-13 1979-09-13 Diesel engine fuel-mixing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7931714A GB2058211B (en) 1979-09-13 1979-09-13 Diesel engine fuel-mixing system

Publications (2)

Publication Number Publication Date
GB2058211A true GB2058211A (en) 1981-04-08
GB2058211B GB2058211B (en) 1983-03-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB7931714A Expired GB2058211B (en) 1979-09-13 1979-09-13 Diesel engine fuel-mixing system

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413604A (en) * 1980-10-13 1983-11-08 Star Engineering Applications Limited Fuel blending installation
US4641625A (en) * 1984-10-10 1987-02-10 Industrial Trade Exchange, Inc. Fuel control system
US5469830A (en) * 1995-02-24 1995-11-28 The Cessna Aircraft Company Fuel blending system method and apparatus
WO2007052099A1 (en) * 2005-11-04 2007-05-10 Alexander Sellentin Fuel supply device for a diesel engine and method for operating a fuel supply device for a diesel engine
WO2008065238A1 (en) * 2006-11-30 2008-06-05 Wärtsilä Finland Oy Marine vessel machinery and a method of controlling exhaust gas emissions in a marine vessel
US8849541B2 (en) 2012-06-22 2014-09-30 Rolls-Royce Plc Fuel delivery system
US20150134151A1 (en) * 2013-11-13 2015-05-14 Rolls-Royce Plc Engine fuel delivery system
US9146566B2 (en) 2012-06-22 2015-09-29 Rolls-Royce Plc Fuel system
US9518965B2 (en) 2012-06-22 2016-12-13 Rolls-Royce Plc Fuel system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413604A (en) * 1980-10-13 1983-11-08 Star Engineering Applications Limited Fuel blending installation
US4641625A (en) * 1984-10-10 1987-02-10 Industrial Trade Exchange, Inc. Fuel control system
US5469830A (en) * 1995-02-24 1995-11-28 The Cessna Aircraft Company Fuel blending system method and apparatus
EP0733796A2 (en) * 1995-02-24 1996-09-25 The Cessna Aircraft Company Fuel blending system, method and apparatus
EP0733796A3 (en) * 1995-02-24 1997-01-29 Cessna Aircraft Co Fuel blending system, method and apparatus
WO2007052099A1 (en) * 2005-11-04 2007-05-10 Alexander Sellentin Fuel supply device for a diesel engine and method for operating a fuel supply device for a diesel engine
WO2008065238A1 (en) * 2006-11-30 2008-06-05 Wärtsilä Finland Oy Marine vessel machinery and a method of controlling exhaust gas emissions in a marine vessel
US8849541B2 (en) 2012-06-22 2014-09-30 Rolls-Royce Plc Fuel delivery system
US9146566B2 (en) 2012-06-22 2015-09-29 Rolls-Royce Plc Fuel system
US9518965B2 (en) 2012-06-22 2016-12-13 Rolls-Royce Plc Fuel system
US20150134151A1 (en) * 2013-11-13 2015-05-14 Rolls-Royce Plc Engine fuel delivery system
US9567101B2 (en) * 2013-11-13 2017-02-14 Rolls-Royce Plc Engine fuel delivery system

Also Published As

Publication number Publication date
GB2058211B (en) 1983-03-09

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PCNP Patent ceased through non-payment of renewal fee