Evaluation of the diesel engine behaviors of premixed hybrid biodiesel obtained from tannery waste fat and canola oil

In this study, hybrid biodiesel was produced from a mixture of canola oil and tannery waste fat. The hybrid fuel meets the biodiesel fuel standards. Especially, the hybrid fuel cold flow properties were better than the biodiesel obtained from only tannery waste fat. HB10 and HB30 diesel-hybrid biodiesel fuel mixtures were prepared by mixing the biodiesel fuel with 10 and 30% by volume. The biodiesel produced by adding canola oil to the tannery waste fat decreased the cold filter plugging point from 10 to 0 °C compared to the biodiesel obtained only from tannery waste fat. The experiments were carried out with a single-cylinder diesel engine under different loads and speeds. While the highest increase in brake-specific fuel consumption value compared to diesel fuel was realized as 9 and 17% in HB10 and HB30 fuels, respectively, at 1800 rpm and 3 Nm; the highest decrease in brake-thermal efficiency value was realized as 8 and 15% in HB10 and HB30, respectively. It was observed that the start of injection and combustion of hybrid biodiesel blends was earlier than diesel fuel, and the ignition delay values were close to each other for all test fuels. NO_x emissions slightly increased as the hybrid biodiesel addition to diesel fuel increased. In addition, the soot emissions of HB10 fuel decreased slightly, while soot emissions of HB30 fuel increased. HB10 fuel reduced soot emissions by 1.7% at 1800 rpm and 9 Nm while reduced by 1.5% at 12 Nm.