Dual fuel diesel engine operation using LPG

Diesel engine fuelling with LPG represents a good solution to reduce the pollutant emissions and to improve its energetic performances. The high autoignition endurance of LPG requires specialized fuelling methods. From all possible LPG fuelling methods the authors chose the diesel-gas method because...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2016-08, Vol.147 (1), p.12122
Main Authors: Mirica, I, Pana, C, Negurescu, N, Cernat, Al, Nutu, N C
Format: Article
Language:English
Subjects:
Combustion efficiency
Diesel engines
Diesel fuels
Efficiency
Exhaust gases
Fuel consumption
Homogeneity
Liquefied petroleum gas
LPG
Nitrogen oxides
Parameters
Pollutants
Spontaneous combustion
Substitutes
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Summary:Diesel engine fuelling with LPG represents a good solution to reduce the pollutant emissions and to improve its energetic performances. The high autoignition endurance of LPG requires specialized fuelling methods. From all possible LPG fuelling methods the authors chose the diesel-gas method because of the following reasons: is easy to be implemented even at already in use engines; the engine does not need important modifications; the LPG-air mixture has a high homogeneity with favorable influences over the combustion efficiency and over the level of the pollutant emissions, especially on the nitrogen oxides emissions. This paper presents results of the theoretical and experimental investigations on operation of a LPG fuelled heavy duty diesel engine at two operating regimens, 40% and 55%. For 55% engine load is also presented the exhaust gas recirculation influence on the pollutant emission level. Was determined the influence of the diesel fuel with LPG substitution ratio on the combustion parameters (rate of heat released, combustion duration, maximum pressure, maximum pressure rise rate), on the energetic parameters (indicate mean effective pressure, effective efficiency, energetic specific fuel consumption) and on the pollutant emissions level. Therefore with increasing substitute ratio of the diesel fuel with LPG are obtained the following results: the increase of the engine efficiency, the decrease of the specific energetic consumption, the increase of the maximum pressure and of the maximum pressure rise rate (considered as criteria to establish the optimum substitute ratio), the accentuated reduction of the nitrogen oxides emissions level.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/147/1/012122