Utilization of blends of biodiesel and higher alcohols in a small capacity diesel engine 2019-01-0580
India traditionally is a diesel based economy. Diesel engine due to higher thermal efficiency and load carrying capacity are used in farming, transportation and industrial sectors. Diesel engine, however, emits large amount of gaseous emissions and particulate matter. India is also a net importer of petroleum derived fuels and substantial amount in precious foreign exchange is spent for this. Lot of work on renewable diesel like fuels is carried in the last three decades in India and most promising of them is biodiesel. Biodiesel, however, suffers from the drawback of relatively higher kinematic viscosity and higher alcohols such as n-butanol and n-octanol could be blended with the biodiesel to bring its properties similar to diesel fuel. In the present study, biodiesel was prepared from Jatropha oil (JO). Jatropha oil methyl ester (JOME) was separately blended with higher alcohols in proportions (10 and 20% on vol. basis). Phase stability suggested that there was no separation even a period of three months. The physico-chemical properties were comparable with diesel. The experimental study on a single cylinder diesel engine shows that brake thermal efficiency (BTE) for the blends of biodiesel and higher alcohol is lower than diesel. The HC emissions were higher than diesel whereas NOx was lower than diesel engine operation due to lower combustion temperature on account of high latent heat of vaporization of alcohols. It can be concluded that blending of higher alcohols with biodiesel is an attractive proposition for reduction of NOx emissions from a biodiesel fuelled engine with comparable performance.