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Abstract:The problem of energy consumption is growing because of the increase in population. Energy demand is commonly supplied by the fossil fuels however they bring up against the problem of run out. Biogas is a renewable fuel which is a candidate for duel fuel diesel engines. This work focuses on the effect of carbon dioxide on exhaust emission characteristics of a duel fuel diesel engine run on synthetic biogas. Four cylinder, water cooled, turbocharged, a diesel engine with Common Rail fuel injection system is used for this investigation. A simple mixing chamber is placed between inlet manifold and air filter. Experiments have been conducted at 1750 rpm under different loads (50 N.m, 75 N.m and 100 N.m). Main fuels used in this investigation are methane, M60:C40 and M80:C20 in dual fuel mode. In dual fuel mode using biogas increases hydrocarbon, nitrogen oxide and carbon dioxide emissions. Soot emission decrease in duel fuel mode. In the light of experimental data, it is understood that electronic control unit of the diesel engine cannot manage dual fuel mode. Original electronic control unit have to be reprogrammed.

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