Engine performance and exhaust emission of diesel dual fuel engine fuelled by biodiesel,diesel and natural gas

The performance and exhaust emission of 6 cylinder four stroke direct injection diesel dual fuel (ddf) engine were investigated,the duel fuel used is corn oil methyl esters consist of 5%,10%,15% and 20% blends with diesel and compressed natural gas (cng). experiment was conducted at a fixed compression ratio of 17.5:1 with variance of engine speed 1400,1800,2400 and 2600 rpm. combination of biodiesel and cng showed a better result on engine performance in terms of horse power and engine torque compared to other types of tested fuel. the substantial decrease of 25.6 % in exhaust emission flue was observed,giving lower value of uhc and nitrogen oxide (nox). however,when the fuel is blended with cng,a poor performance on exhaust emission was recorded,which include carbon dioxide (co2),carbon monoxide (co),unburned hydrocarbon (uhc) and nitrogen oxide (nox) due to presence of cng in fuel. © 2016 penerbit utm press. all rights reserved.