Effects of biodiesel blended fuels on exhaust emissions of diesel engine

Abstract

The effect of biodiesel blended fuels on exhaust emissions of diesel engines was investigated. The test fuels were 2%, 5%, 20% of rapeseed methyl ester, pure rapeseed methyl ester, 2%, 5%, 20% of palm stearin methyl ester, pure palm strearin methyl ester, 20%, 30%, 40% of used cooking oil methyl ester. Two kinds of test vehicles were Toyota D4D 2.5L and Isuzu DMAX 2.5L. The exhaust emissions analysis were carried out by running on chassis dynamometer. The results showed that the blends of 2%, 5% of palm strearin methyl ester and rapeseed methyl ester showed did not significant difference in exhaust emissions and fuel consumption compared to based diesel. In the other hand, the blends of 5% showed tendency reduction of THC and PM emissions. The blends of 20% with all kinds methyl ester, the THC, PM emissions were decreased 10-34% and 6-34% while the fuel consumption was increased 2-5%. Used cooking oil methyl ester blended with diesel in ratio 30, 40%were decreased THC, PM emissions 18-27% and 16-36%. NOX emissions and fuel consumption were increased 7%, 5-6%. Pure palm strearin methyl ester and rapeseed methyl ester provides a greater reduction of all exhaust emissions. On the contrary, NOX emission and fuel consumption were increased