DE3117374A1 - Diesel engine fuel - Google Patents

Diesel engine fuel

Info

Publication number
DE3117374A1
DE3117374A1 DE19813117374 DE3117374A DE3117374A1 DE 3117374 A1 DE3117374 A1 DE 3117374A1 DE 19813117374 DE19813117374 DE 19813117374 DE 3117374 A DE3117374 A DE 3117374A DE 3117374 A1 DE3117374 A1 DE 3117374A1
Authority
DE
Germany
Prior art keywords
fuel
diesel engine
cooling water
use according
temperature
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.)
Ceased
Application number
DE19813117374
Other languages
German (de)
Inventor
Ernst 5014 Türnich Banik
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19813117374 priority Critical patent/DE3117374A1/en
Publication of DE3117374A1 publication Critical patent/DE3117374A1/en
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
    • C10L1/026—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only for 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
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • 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
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Liquid Carbonaceous Fuels (AREA)

Abstract

The invention relates to the use of vegetable or animal fats or oils as a diesel engine fuel, a preheating device for the fuel being provided upstream of the injection pump of the diesel engine for sufficient liquefaction of the fuel. Advantageously, the waste heat of the diesel engine is used for preheating the fuel.

Description

Kraftstoff für einen DieselmotorFuel for a diesel engine

Die Erfindung betrifft einen Kraftstoff für einen Dieselmotor.The invention relates to a fuel for a diesel engine.

Aufgabe der Erfindung ist es, angesichts der hohen Kosten für Mineralöl einen Kraftstoff für einen Dieselmotor verwendbar zu machen, der als Alternative einsetzbar und billig ist.The object of the invention is, in view of the high cost of mineral oil to make a fuel for a diesel engine usable, as an alternative can be used and is cheap.

ErfindungsgemaB wird daher die Verwendung von pflanzlichen oder tierischen Fetten oder Ölen als Kraftstoff für einen Dieselmotor vorgeschlagen,wobei eine Vorheizeinrichtung für den Kraftstoff vor der Einspritzpumpe des Dieselmotors zum genügenden Verflüssigen des Kraftstoffs vorgesehen ist Zu den pflanzlichen und tierischen Ölen oder Fetten gehören insbesondere solche, die bei einer Temperatur von 60 bis 80" C eine genügend flüssige Konsistenz aufweisen, um mittels der Einspritzpumpe des Dieselmotors eingespritzt werden zu können. Gegebenenfalls kann ein Verflüssiger für das Fett oder Öl als Zusatz verwendet werden.According to the invention, therefore, the use of vegetable or animal Fats or oils proposed as fuel for a diesel engine, with a preheating device for the fuel in front of the injection pump of the diesel engine for sufficient liquefaction of the fuel is provided to the vegetable and animal oils or fats include in particular those that are sufficient at a temperature of 60 to 80 "C have liquid consistency to be injected by means of the injection pump of the diesel engine to be able to. If necessary, a liquefier can be used for the fat or oil Addition can be used.

ErfindungsgemaB lassen sich insbesondere AbfallprodUkte verwenden, etwa gebrauchtes Frittieröl, ausgelassenes Tierfett o.dgl.Etwa beim Frittieröl wird das Öl zunächst einem Verwendungszweck zugeführt und dann später als Kraftstoff verwendet, wodurch sich eine besonders wirtschaftliche Verwertung ergibt.According to the invention, in particular waste products can be used, used frying oil, rendered animal fat or the like, for example with frying oil the oil is first used for a purpose and then later as fuel used, which results in a particularly economical recovery.

Die als Kraftstoff verwendeten Fette und Öle können bereits bei Raumtemperatur flüssig, aber auch noch mehr oder weniger zähflüssig oder fest sein.The fats and oils used as fuel can already be used at room temperature be liquid, but also more or less viscous or solid.

ZweckmaBigerweise verwendet man zum Erwärmten des Kraftstoffs das Kühlwasser des Dieselmotors. Da dieses jedoch beim Starten in der Regel noch nicht eine zum genügenden Verflüssigen des Kraftstoffs ausreichende Temperatur besitzt, kann man zunächst den Dieselmotor mit Dieselkraftstoff solange betreiben, bis das Kühlwasser auf Temperatur ist, wonach der erfindungsgenïße Kraftstoff verwendet wird. Die Umschaltung kann beispielsweise über einen Filhler für die Temperatur des Kilhiwasser erfolgen.It is best to use the to heat the fuel Cooling water of the diesel engine. However, since this is usually not yet possible when the system is started has a sufficient temperature to sufficiently liquefy the fuel, you can first run the diesel engine with diesel fuel as long as that operate, until the cooling water is at temperature, after which the fuel according to the invention is used will. The switchover can be made, for example, via a sensor for the temperature of the Kilhi water.

Stattdessen kann man aber auch eine elektrisch betriebene Vorwärmeinrichtung für den-Kraftstoff vorsehen, die dann, wenn ansonsten mit Kühlwasser vorgewärmt wird, etwa auch über einen Fühler für die Temeperatur des Kühlwassers abgeschaltet wird.Instead, you can also use an electrically operated preheater for the fuel provided, if otherwise preheated with cooling water is switched off, for example via a sensor for the temperature of the cooling water will.

Das Kühlwasser wird zweckmäßigerweise im Kreislauf bis zum Tank für den Kraftstoff geführt, wo ein Wärmeaustausch zwischen Kühlwasser und Kraftstoff stattfindet. Gegebenenfalls wird das Kühlwasser auch um die Zuleitung vom Tank zur Einspritzpumpe geffihrt oder eine WarTrEisolierung fiir die Zuleitung vorgesehen.The cooling water is expediently in the circuit up to the tank for The fuel is passed where there is a heat exchange between cooling water and fuel takes place. If necessary, the cooling water is also around the supply line from the tank to the Injection pump guided or maintenance insulation provided for the supply line.

Insbesondere ist es zweckmEßig, einen kleinen Vorratsbehälter ftir den Kraftstoff vor der Einspritzpumpe anzuordnen, dessen Inhalt zunächst etwa durch elektrische Vorwärmung genügend verflüssigt wird, um den Dieselmotor starten und solange betreiben zu können, bis das Kühlwasser den im Tank befindlichen Kraftstoff genügend erwärmt hat, so daß dieser nachstromt und die zum Einspritzen notwendige Temperatur erreicht. Auf diese Weise benötigt man nur wenig elektrische Energie zum Vorheizen, die von einer Batterie o.dgl. geliefert werden kann, während das restliche Vorheizen unter Ausnutzung der Motorabwarme vorgenommen wird. In dem Vorratsbehälter kann auch ein zusätzliches Erwärmen des hineinströmenden Kraftstoffs über das Kiihlwasser oder über eine elektrisch, etwa von einer Lichtmaschine betriebene Heizschlange vorgenommen werden, um Temperaturverluste auf dem Weg vom Tank zur Einspritzpumpe auszugleichen oder eine höhere Vorwärmtemperatur zu erzielen.In particular, it is useful to have a small storage container for to arrange the fuel in front of the injection pump, its content initially approximately through electrical preheating is liquefied enough to start the diesel engine and to be able to operate until the cooling water removes the fuel in the tank has heated enough so that it flows in and the necessary for injection Temperature reached. In this way, only a small amount of electrical energy is required for preheating, which is powered by a battery or the like. can be delivered while the the rest of the preheating is carried out using the engine waste heat. In the storage container can also be an additional heating of the fuel flowing in via the cooling water or via an electrically operated heating coil, for example from an alternator be made to avoid temperature losses on the way from the tank to the injection pump equalize or achieve a higher preheating temperature.

Eine Geruchsbelästigung oder eine starke Rußerzeugung tritt nicht auf, vielmehr scheint die Rußerzeugung geringer als bei Verwendung von Dieselkraftstoff zu sein. Das Einbauen der Vorheizung ist nicht aufwendig und schon nach selir kurzer Laufdauer des Dieselmotors durch die Kosteneinsarung beim Kraftstoff amortisiert.There is no unpleasant smell or strong soot generation On the contrary, the soot production seems to be lower than when using diesel fuel to be. The installation of the preheater is not laborious and after a few minutes The service life of the diesel engine is amortized by the cost savings on fuel.

Claims (8)

Patentansprüche Q1. Verwendung von pflanzlichen oder tierischen Fetten oder ölen als Kraftstoff für einen Dieselmotor, wobei eine Vorheizeinrichtung für den Kraftstoff vor der Einspritzpupe des Dieselmotors zum genügenden Verflüssigen des Kraftstoffs vorgesehen ist. Claims Q1. Use of vegetable or animal fats or oil as fuel for a diesel engine, with a preheater for the fuel in front of the diesel engine's injection pump for sufficient liquefaction of the fuel is provided. 2. Verwendung nach Anspruch 1, dadurch gekennzeichnet, daß der Kraftstoff auf eine Temperatur von etwa 60 bis 8QO C erhitzt wird. 2. Use according to claim 1, characterized in that the fuel heated to a temperature of about 60 to 80 ° C. 3. Verwendung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kraftstoff mit Hilfe des Kühlwassers des Dieselmotors erhitzt wird.3. Use according to claim 1 or 2, characterized in that the fuel is heated with the aid of the cooling water of the diesel engine. 4. Verwendung nach Anspruch 3, dadurch gekennzeichnet, daß der Dieselmotor zunächst mit Dieselöl solange betrieben wird, bis das Kühlwasser die zum Verflüssigen des Kraftstoffs ausreichende Temperatur erreicht hat, wonach der Dieselmotor auf den Kraftstoff von Anspruch 1 umgeschaltet wird.4. Use according to claim 3, characterized in that the diesel engine is initially operated with diesel oil until the cooling water has to liquefy the fuel has reached a sufficient temperature, after which the diesel engine switches on the fuel of claim 1 is switched. 5. Verwendung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Kühlwasser des Dieselmotors im Kreislauf geführt ist, der sich in den Bereich des Tanks und gegebenenfalls von Zuführleitungen für den Kraftstoff gemäß Anspruch 1 zwecks WarmeWbertragung auf den Kraftstoff erstreckt.5. Use according to claim 3 or 4, characterized in that the cooling water of the diesel engine is circulated in the area of the tank and optionally of supply lines for the fuel according to claim 1 extends to the fuel for the purpose of heat transfer. 6. Verwendung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß eine elektrische Vorheizeinrichtung vorgesehen ist.6. Use according to one of claims 1 to 5, characterized in that that an electrical preheating device is provided. 7. Verwendung nach Anspruch 6, dadurch gekennzeichnet, daß ein kleiner Vorratsbenalter für den Kraftstoff gemaß Anspruch 1, der mit einer elektrischen Vorheizeinrichtung versehen ist, vor der Einspritzpumpe angeordnet und mit dem Tank für den Kraftstoff verbunden ist.7. Use according to claim 6, characterized in that a small one Reservoir age for the fuel according to claim 1, having an electric Preheater is provided, placed in front of the injection pump and connected to the tank for the fuel is connected. 8. Verwendung nach Anspruch 7, dadurch gekennzeichnet, daß die elektrische Vorheizeinrichtung über einen Temperaturfühler für die Temperatur des Kühlwassers ein- und ausschaltbar ist, während der Vorratsbehälter in Wärmeaustausch mit dem Kühlwasser des Dieselmotors steht.8. Use according to claim 7, characterized in that the electrical Preheating device via a temperature sensor for the temperature of the cooling water can be switched on and off, while the reservoir is in heat exchange with the There is no cooling water in the diesel engine.
DE19813117374 1981-05-02 1981-05-02 Diesel engine fuel Ceased DE3117374A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19813117374 DE3117374A1 (en) 1981-05-02 1981-05-02 Diesel engine fuel

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Application Number Priority Date Filing Date Title
DE19813117374 DE3117374A1 (en) 1981-05-02 1981-05-02 Diesel engine fuel

Publications (1)

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DE3117374A1 true DE3117374A1 (en) 1982-12-02

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DE19813117374 Ceased DE3117374A1 (en) 1981-05-02 1981-05-02 Diesel engine fuel

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635220A1 (en) * 1996-08-30 1998-05-14 Georg Lohmann Control unit for diesel engines running on oil or fat
DE19730876A1 (en) * 1997-07-18 1999-01-21 Nemmert Peter Dipl Ing Fh Pyrolysis unit
FR2795086A1 (en) * 1999-06-16 2000-12-22 Tgs Robin Production of electricity comprises use of recycled waste oil comprising used frying oil
WO2001029154A1 (en) * 1999-10-20 2001-04-26 Qlear B.V. Fuel for diesel engines
WO2002040621A2 (en) * 2000-08-03 2002-05-23 T.G.S. Robin (Societe A Responsabilite Limitee) Method for producing electric power from used cooking oils
DE10139521A1 (en) * 2001-08-10 2003-02-27 Michael Lappoehn Viscosity converter for plant oil in diesel engines, especially vehicle engines, consists of combination of two heat exchangers and first, electrical heat exchanger is very small
EP1174169B1 (en) * 2000-07-22 2003-05-14 Hubert Tippkötter Method of treatment of waste vegetable oils
US6694928B2 (en) 1998-07-24 2004-02-24 Otwoempower Corp. Combustion of fats and oils
WO2004065528A1 (en) * 2003-01-20 2004-08-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Method for fractionating waste fats, especially for producing fuel
WO2005030908A2 (en) * 2003-09-25 2005-04-07 Fraunhofer-Gelellschaft Zur Förderung Der Angewandten Forschung E. V. Method for fractionating animal fat waste, in particular for producing liquid fuels
DE10060573B4 (en) * 2000-12-06 2005-07-07 Ralph Finger Vegetable oil engine plant
WO2007043031A1 (en) * 2005-10-10 2007-04-19 Pt. Pura Barutama Apparatus for converting vegetable oil of diesel machine
WO2007109914A1 (en) * 2006-03-24 2007-10-04 C4 Energie Ag Apparatus for the controlled feeding of various liquid fuels for internal combustion in a diesel engine or in a plurality of diesel engines
DE102007036804A1 (en) 2007-08-03 2009-02-05 Klümper Pflanzenöltechnik GmbH Device for optional operation of combustion engine with two different fuel places, has measuring instrument that is arranged in common feed line for measurement of fuel volume stream
WO2009087073A1 (en) * 2008-01-05 2009-07-16 Herzog, Margarethe Device and method for heating viscous fuels with fuel recirculation
US20100313839A1 (en) * 2007-12-13 2010-12-16 Tony Michael Pocknell Method for Preparing Fuel Oil and a Fuel Oil Prepared by the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1476207A1 (en) * 1964-07-23 1972-02-03 Gratzmuller Jean Louis Constant pressure internal combustion engine fed by heavy fuel
DE2158117A1 (en) * 1971-11-24 1973-05-30 Bosch Gmbh Robert COMBUSTION MACHINE WITH FUEL HEATING
DE3034730A1 (en) * 1979-09-17 1981-04-02 Jocelyn Charleville Mézières Pierard METHOD FOR RESOLUTION OR FOR PREVENTING DEPTHS FROM LOW TEMPERATURE IN A LIQUID, ESPECIALLY IN A FUEL, AND ARRANGEMENT FOR IMPLEMENTING THE PROCESS
DE3008407A1 (en) * 1980-03-05 1981-09-10 Walter 8069 Geisenfeld Braunstorfer Fuel heater for Diesel vehicle - has engine coolant feeding heating coil in fuel tank to prevent crystallisation and filter blockage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1476207A1 (en) * 1964-07-23 1972-02-03 Gratzmuller Jean Louis Constant pressure internal combustion engine fed by heavy fuel
DE2158117A1 (en) * 1971-11-24 1973-05-30 Bosch Gmbh Robert COMBUSTION MACHINE WITH FUEL HEATING
DE3034730A1 (en) * 1979-09-17 1981-04-02 Jocelyn Charleville Mézières Pierard METHOD FOR RESOLUTION OR FOR PREVENTING DEPTHS FROM LOW TEMPERATURE IN A LIQUID, ESPECIALLY IN A FUEL, AND ARRANGEMENT FOR IMPLEMENTING THE PROCESS
DE3008407A1 (en) * 1980-03-05 1981-09-10 Walter 8069 Geisenfeld Braunstorfer Fuel heater for Diesel vehicle - has engine coolant feeding heating coil in fuel tank to prevent crystallisation and filter blockage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Zeitschrift: "Gas and Oil Parer", May 1942, S. 80-85 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635220A1 (en) * 1996-08-30 1998-05-14 Georg Lohmann Control unit for diesel engines running on oil or fat
DE19730876A1 (en) * 1997-07-18 1999-01-21 Nemmert Peter Dipl Ing Fh Pyrolysis unit
US6694928B2 (en) 1998-07-24 2004-02-24 Otwoempower Corp. Combustion of fats and oils
FR2795086A1 (en) * 1999-06-16 2000-12-22 Tgs Robin Production of electricity comprises use of recycled waste oil comprising used frying oil
WO2001029154A1 (en) * 1999-10-20 2001-04-26 Qlear B.V. Fuel for diesel engines
EP1174169B1 (en) * 2000-07-22 2003-05-14 Hubert Tippkötter Method of treatment of waste vegetable oils
WO2002040621A2 (en) * 2000-08-03 2002-05-23 T.G.S. Robin (Societe A Responsabilite Limitee) Method for producing electric power from used cooking oils
WO2002040621A3 (en) * 2000-08-03 2007-10-11 T G S Robin Sarl Method for producing electric power from used cooking oils
DE10060573B4 (en) * 2000-12-06 2005-07-07 Ralph Finger Vegetable oil engine plant
DE10139521A1 (en) * 2001-08-10 2003-02-27 Michael Lappoehn Viscosity converter for plant oil in diesel engines, especially vehicle engines, consists of combination of two heat exchangers and first, electrical heat exchanger is very small
WO2004065528A1 (en) * 2003-01-20 2004-08-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Method for fractionating waste fats, especially for producing fuel
WO2005030908A2 (en) * 2003-09-25 2005-04-07 Fraunhofer-Gelellschaft Zur Förderung Der Angewandten Forschung E. V. Method for fractionating animal fat waste, in particular for producing liquid fuels
WO2005030908A3 (en) * 2003-09-25 2009-03-26 Fraunhofer Gelellschaft Zur Fo Method for fractionating animal fat waste, in particular for producing liquid fuels
WO2007043031A1 (en) * 2005-10-10 2007-04-19 Pt. Pura Barutama Apparatus for converting vegetable oil of diesel machine
WO2007109914A1 (en) * 2006-03-24 2007-10-04 C4 Energie Ag Apparatus for the controlled feeding of various liquid fuels for internal combustion in a diesel engine or in a plurality of diesel engines
DE102007036804A1 (en) 2007-08-03 2009-02-05 Klümper Pflanzenöltechnik GmbH Device for optional operation of combustion engine with two different fuel places, has measuring instrument that is arranged in common feed line for measurement of fuel volume stream
US20100313839A1 (en) * 2007-12-13 2010-12-16 Tony Michael Pocknell Method for Preparing Fuel Oil and a Fuel Oil Prepared by the same
WO2009087073A1 (en) * 2008-01-05 2009-07-16 Herzog, Margarethe Device and method for heating viscous fuels with fuel recirculation

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