CH388015A - Method for operating a piston internal combustion engine with gaseous fuel - Google Patents
Method for operating a piston internal combustion engine with gaseous fuelInfo
- Publication number
- CH388015A CH388015A CH1065661A CH1065661A CH388015A CH 388015 A CH388015 A CH 388015A CH 1065661 A CH1065661 A CH 1065661A CH 1065661 A CH1065661 A CH 1065661A CH 388015 A CH388015 A CH 388015A
- Authority
- CH
- Switzerland
- Prior art keywords
- air
- internal combustion
- operating
- combustion engine
- gaseous fuel
- Prior art date
Links
Classifications
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- 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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
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- 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
- F02B2710/00—Gas engines
- F02B2710/03—Two stroke engines
- F02B2710/038—Two stroke engines with measures for improving combustion
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- 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
-
- 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)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
Verfahren zum Betrieb einer Kolbenbrennkraftmaschine mit gasförmigem Brennstoff Die Erfindung betrifft ein Verfahren zum Betrieb einer Kolbenbrennkraftmaschine mit gasförmigem Brennstoff, welches dadurch gekennzeichnet ist, dass bei Teillast die Brennluft vor Einführung in den Zylinder auf erhöhte Temperatur gebracht wird.
Bei Kolbenbrennkraftmaschinen besteht die Schwie rigkeit, dass ein Gas-Luftgemisch nur in einem be grenzten Mischverhältnis entzündbar ist. Ausserdem ist auch bei mageren Gemischen, also bei Gemischen die wenig Gas enthalten, aus verschiedenen Gründen der Betrieb unwirtschaftlich, auch wenn noch Ent- zündbarkeit vorliegt. Durch diese Umstände wird die Regelung der Maschine bei Teillast erschwert.
Es ist bekannt, bei Teillast zwecks Aufrechterhal tung eines gewünschten Gas-Luftverhältnisses zu sammen mit Verminderung der Gaszufuhr auch die Luftzufuhr zu drosseln. Durch den dabei entstehenden Unterdruck werden jedoch Leistungsverluste der Ma schine verursacht. Bei Zweitaktmotoren entsteht zu dem der grundlegende Nachteil, dass durch eine Luft drosselung die Spülung des Motors verschlechtert wird.
Es entsteht dabei insbesondere bei längs gespülten Motoren die Gefahr einer Schichtenbildung, wobei im zentralen Teil des Verbrennungsraumes, also dort, wo normalerweise die Zündung herbei geführt werden soll, die Verbrennungsgase von der vorigen Verbrennung konzentriert sind und dadurch die Entzündung eines an sich brennbaren Frischluft- Gasgemisches verhindern.
Erfindungsgemäss wird eine Verbesserung des Betriebes einer derartigen Maschine bei Teillast er zielt, unter Vermeidung der mit einer Drosselung ver bundenen Nachteile.
Durch die Erhitzung wird das spezifische Gewicht der Ansaugluft vermindert, so dass im Zylinderraum ein vermindertes Luftgewicht vorhanden ist, ohne dass zum Mittel der Druckabsenkung, z. B. durch Dros selung, geschritten werden muss. Zudem hat es sich erwiesen, dass wärmere Ansaugluft bei Teillastbetrieb eine günstigere Verbrennung ergibt, welche in einem kleineren Teillast-Brennstoffverbrauch resultiert. Es werden insbesondere durch die erhöhte Temperatur der Ansaugluft die Grenzen der Brennbarkeit des Gasluftgemisches nach unten ausgeweitet. Es liegt also bei wärmerer Ansaugluft die untere Grenze der Brennbarkeit bei einem Gemisch mit geringerem Gas gehalt als bei kühlerer Ansaugluft.
Die Erhitzung der Ansaugluft kann z. B. mit Hilfe eines Wärmeübertragers durchgeführt werden, der auf der einen Seite von der Ansaugluft, auf der anderen Seite durch Auspuffgase durchströmt wird. Bei Volllast wird dieser Wärmeübertrager ausge schaltet.
Die Erhitzung kann auch anstatt durch Auspuff gase durch ein in einem Abhitzekessel erhitztes Medium, z. B. Wasser oder Wasserdampf erfolgen. In einem solchen Falle ist es auch mit Vorteil möglich, einen normalerweise in der Ansaugleitung vor handenen Luftkühler zur Lufterhitzung heranzu ziehen. Es ist dabei nur notwendig, diesen vom Kühl wasserkreislauf abzutrennen und an die Heisswasser-, bzw. Dampfleitung des Abhitzekessels anzuschliessen.
Method for operating a piston internal combustion engine with gaseous fuel. The invention relates to a method for operating a piston internal combustion engine with gaseous fuel, which is characterized in that at partial load the combustion air is brought to an elevated temperature before it is introduced into the cylinder.
With piston internal combustion engines there is the difficulty that a gas-air mixture can only be ignited in a limited mixing ratio. In addition, even with lean mixtures, that is, with mixtures that contain little gas, operation is uneconomical for various reasons, even if it is still ignitable. These circumstances make it difficult to control the machine at part load.
It is known to throttle the air supply at part load for the purpose of maintaining a desired gas-air ratio together with reducing the gas supply. However, the resulting negative pressure causes the machine to lose its performance. In the case of two-stroke engines, there is also the fundamental disadvantage that the purging of the engine is impaired by throttling the air.
There is a risk of stratification, especially in longitudinally scavenged engines, whereby the combustion gases from the previous combustion are concentrated in the central part of the combustion chamber, i.e. where the ignition should normally take place, and thus the ignition of a per se combustible fresh air Prevent gas mixture.
According to the invention, an improvement in the operation of such a machine at part load is aimed at avoiding the disadvantages associated with throttling.
As a result of the heating, the specific weight of the intake air is reduced, so that there is a reduced air weight in the cylinder space without the need for the means of pressure reduction, e.g. B. by throttling, must be stepped. In addition, it has been shown that warmer intake air results in more favorable combustion in part-load operation, which results in lower part-load fuel consumption. In particular, the increased temperature of the intake air extends the limits of the combustibility of the gas-air mixture downwards. So it is with warmer intake air, the lower limit of flammability for a mixture with a lower gas content than with cooler intake air.
The heating of the intake air can, for. B. be carried out with the help of a heat exchanger, which is flowed through on the one hand by the intake air, on the other hand by exhaust gases. This heat exchanger is switched off at full load.
The heating can also be used instead of exhaust gases by a medium heated in a waste heat boiler, e.g. B. water or steam. In such a case, it is also advantageously possible to use an air cooler that is normally present in the intake line to heat the air. It is only necessary to separate this from the cooling water circuit and connect it to the hot water or steam line of the waste heat boiler.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1065661A CH388015A (en) | 1961-09-15 | 1961-09-15 | Method for operating a piston internal combustion engine with gaseous fuel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1065661A CH388015A (en) | 1961-09-15 | 1961-09-15 | Method for operating a piston internal combustion engine with gaseous fuel |
Publications (1)
Publication Number | Publication Date |
---|---|
CH388015A true CH388015A (en) | 1965-02-15 |
Family
ID=4365454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1065661A CH388015A (en) | 1961-09-15 | 1961-09-15 | Method for operating a piston internal combustion engine with gaseous fuel |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH388015A (en) |
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1961
- 1961-09-15 CH CH1065661A patent/CH388015A/en unknown
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