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Research on Fuel Efficiency and Emissions of Converted Diesel Engine with Conventional Fuel Injection System for Operation on Natural Gas

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Department of Marine Engineering, Faculty of Marine Technologies and Natural Sciences, Klaipeda University, Bijunu Str. 17, LT-91225 Klaipeda, Lithuania
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Department of Automobile Engineering, Transport Engineering Faculty, Vilnius Gediminas Technical University, J. Basanavičiaus Str. 28, LT-03224 Vilnius, Lithuania
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Author to whom correspondence should be addressed.
Energies 2019, 12(12), 2413; https://doi.org/10.3390/en12122413
Received: 20 May 2019 / Revised: 15 June 2019 / Accepted: 19 June 2019 / Published: 23 June 2019
(This article belongs to the Section Energy and Environment)
This paper presents a study on the energy efficiency and emissions of a converted high-revolution bore 79.5 mm/stroke 95 mm engine with a conventional fuel injection system for operation with dual fuel feed: diesel (D) and natural gas (NG). The part of NG energy increase in the dual fuel is related to a significant deterioration in energy efficiency ( η i ) , particularly when engine operation is in low load modes and was determined to be below 40% of maximum continuous rating. The effectiveness of the D injection timing optimisation was established in high engine load modes within the range of a co-combustion ratio of NG   0.4: with an increase in η i , compared to D, the emissions of NO x + HC decreased by 15%   to   25%, while those of CO 2 decreased by 8% to16%; the six-fold CO emission increase, up to 6 g/kWh, was unregulated. By referencing the indicated process characteristics of the established NG phase elongation in the expansion stroke, the combustion time increase as well as the associated decrease in the cylinder excess air ratio (α) are possible reasons for the increase in the incomplete combustion product emission. View Full-Text
Keywords: compression ignition engine; conventional fuel injection system; natural gas; energy and emission indicators; fuel injection phase compression ignition engine; conventional fuel injection system; natural gas; energy and emission indicators; fuel injection phase
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MDPI and ACS Style

Lebedevas, S.; Pukalskas, S.; Daukšys, V.; Rimkus, A.; Melaika, M.; Jonika, L. Research on Fuel Efficiency and Emissions of Converted Diesel Engine with Conventional Fuel Injection System for Operation on Natural Gas. Energies 2019, 12, 2413.

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