Effect of Pilot Fuel Quantity on the Performance of a Dual Fuel Engine

Alla, G. H. Abd; Soliman, Hatem; Badr, Osama; Rabbo, M.F. Abd

doi:10.4271/1999-01-3597

Cited by 29 publications

(22 citation statements)

References 10 publications

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“…The combustion quality in these conditions can be improved by lowering the substitution rate. [4,15] Also, Karim G.A. states in his research that ignition delay behavior between DF-and diesel combustion differs significantly [15].…”

Section: Lambda λmentioning

confidence: 99%

“…High diesel pilot injection quantities also leads to rapid heat release, therefore increasing risks of early engine knock. [4] …”

Section: Diesel Pilot Injection Parametersmentioning

confidence: 99%

“…High load operation efficiency on the other hand is reliant of the methane characteristics during very lean combustion, as the high cylinder pressures sets threshold limits for a controlled heat-release cycle. More specifically: Uncontrolled high load combustion may lead to engine knock or other abnormal combustion phenomenon affecting negatively both the engine life-expectancy and causing low thermal efficiency [4,5]. Other challenging features of methane have been found: The unburned methane emissions are problematic to handle using conventional exhaust gas after-treatment systems.…”

mentioning

confidence: 99%

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Dual-Fuel Combustion Characterization on Lean Conditions and High Loads

Pettinen

Kaario

Larmi

2017

SAE Technical Paper Series

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Unstable oil markets combined with the alarming statistics of continuously growing emission problems causes anxiety among many nations. The greatest dilemma lies in the answer about how to rationally overcome the dependency of fossil based energy sources. The truth seems to be found on utilizing renewable energy generating low emissions. Methane is suggested as one of the worthwhile solutions for substituting crude-oil based fuels. Methane as a fuel combined with modern engine technology seems to open possibilities solving the above mentioned problems.Dual-fuel technology is suggested as a solution for effectively utilizing alternative fuels in the near future. Charge air mixed methane combined with a compression ignition engine utilizing a small diesel pilot injection seems to form a worthwhile compromise between good engine efficiency and low emission outcome. Problems concerning dual-fuel technology profitableness seems to be related to fully control the combustion in relation to lean conditions. Lean operating conditions solves the problems concerning pumping losses, but brings challenges in controlling the slow heat release of the premixed methane.A study concerning lean operation dual-fuel combustion was executed. In the thesis, a single cylinder 'free parameter' diesel engine was adapted for dual-fuel (diesel-methane) usage. A parameter research related to lambda window widening possibilities was carried out. The main variables studied were diesel pilot injection timing and pressure, diesel substitution rate and the relation between combustion characteristics and charge air temperature.Diesel pilot injection parameter optimization seems to affect less on combustion quality compared to the benefits from increasing the charge mass reactivity through preheating the charge air. Improvements in combustion quality were noted in all lean condition tests in the diesel substitution rate scale 0 -70%. However, significant variation in combustion characteristics were noted through the whole substitution rate range. Remarkable accomplishments in combustion behavior were experienced in the misfire boundary conditions in a form of premixed mixture ignition in the end gas region (PREMIER).Keywords dual-fuel, methane fuel, combustion character TiivistelmäÖljymarkkinoiden epävarmat ennusteet sekä jatkuvasti kohoavat päästöt aiheuttavat maailmanlaajuista huolta tulevaisuuden kannalta. Suurimmat kysymykset ongelmatilanteeseen liittyvät fossiilisten raakaöljyjen korvaamismahdollisuuksiin. Ratkaisu vaikuttaisi löytyvän uusiutuvista, matalia päästöarvoja tuottavista energianlähteistä. Yhdeksi kannattavaksi raakaöljyn korvaajaksi on ehdotettu metaanikaasua. Ennusteet metaanikaasun eduista yhdistettynä modernien polttomoottorien kanssa enteilevät mahdollisuuksia ongelmien ratkaisemiseksi.Dual-fuel-teknologia on esitetty hyväksi moottorityypiksi hyödyntämään uusiutuvia energianlähteitä. Imuilmaan esisekoitettu metaanikaasu yhdistettynä puristussytytteisen polttomoottorin kanssa, jossa polttoaine-seoksen syttymistä sekä p...

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Section: Lambda λmentioning

confidence: 99%

“…High diesel pilot injection quantities also leads to rapid heat release, therefore increasing risks of early engine knock. [4] …”

Section: Diesel Pilot Injection Parametersmentioning

confidence: 99%

mentioning

confidence: 99%

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Dual-Fuel Combustion Characterization on Lean Conditions and High Loads

Pettinen

Kaario

Larmi

2017

SAE Technical Paper Series

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“…The tendency is a poorer atomization when the mass flow rate reduces and this has strong effects on hydrocarbons and carbon monoxide emissions. However, the atomization is most affected when the amount of fuel injected per cycle is reduced below 5 to 10% of the maximum design level (Abd Alla et al, 2000).…”

Section: Effect Of Dual Fuel Operation On Hydrocarbon Emissionsmentioning

confidence: 99%

Performance and gaseous emissions characteristics of a natural gas/diesel dual fuel turbocharged and aftercooled engine

Egusquiza¹,

Braga²,

Braga³

2009

J. Braz. Soc. Mech. Sci. & Eng.

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“…Although numerous works have been published over the last decades on the regulated gaseous emissions from natural gas (NG) operated dual fuel engines (Boisvert et al 1988;Wong et al 1991;Weaver and Turner 1994;Abd Alla et al 2000;Galal et al 2002;Papagiannakis and Hountalas 2004;Patterson et al 2006), only a very few of them are found to investigate either the smoke or PM emissions for the NG-diesel dual fuel engines (e.g., Boisvert et al 1988;Wong et al 1991;Papagiannakis and Hountalas 2004). On the other hand, a very limited number of published research works are found for biogas-diesel dual fuel engines especially from an emissions perspective such as Karim and Amoozegar (1982), Karim and Weirzba (1992), and Henam and Makkar (1998).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Exhaust Particulates from a Dual Fuel Engine by TGA, XPS, and Raman Techniques

Mustafi

Raine

James

2010

Aerosol Science and Technology

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Particulate matter (PM) emitted from a dual fuel engine is characterized using thermogravimetry, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Thermogravimetric analysis (TGA) provides the mass fractions of elemental carbon and volatile materials in PM; XPS provides the possible chemical compositions in the topmost layer of PM surface and Raman analysis provides the possible structure of the carbon presented in PM. Dual fuel engine uses both liquid (diesel) and gaseous fuels simultaneously to produce mechanical power and can be switched to only diesel fueling under load. The dual fuel engine is operated with natural gas and simulated biogases (laboratory prepared) and results are compared between the dual fueling and diesel fueling under the same engine operating conditions. Significantly higher volatile fractions in PM are obtained for dual fueling compared to diesel fueling complementing the gravimetric results. The maximum contribution of the graphitic carbon or aliphatic carbon such as hydrocarbons and paraffins (C C or C C) are found in the topmost atomic layers of both the diesel and dual fuel PM samples. The other chemical states are found to be the carbon-oxygen functional groups indicating significant oxidation behavior in the PM surface. Lesser aromatic content is noticed in the case of dual fuel PM than diesel PM. The carbon in dual fuel PM is found to be more amorphous compared to diesel PM. These characterizations provide us new information how the PM from a diesel engine can be different from that from a dual fuel engine.

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Effect of Pilot Fuel Quantity on the Performance of a Dual Fuel Engine

Cited by 29 publications

References 10 publications

Dual-Fuel Combustion Characterization on Lean Conditions and High Loads

Dual-Fuel Combustion Characterization on Lean Conditions and High Loads

Performance and gaseous emissions characteristics of a natural gas/diesel dual fuel turbocharged and aftercooled engine

Characterization of Exhaust Particulates from a Dual Fuel Engine by TGA, XPS, and Raman Techniques

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