The study on particulate emissions of engine fuelled with biodiesel-diesel blends

Particulate emissions of a direct injection diesel engine fuelled with different proportions of Pistacia chinensis Bunge seed biodiesel-diesel blends were collected under different fuel supplying advanced angles and different operating conditions. These samples were analyzed by using Thermo-gravimetric analytical instrument and High Resolution Transmission electron microscopy. The results showed that under the tested conditions, particulate emissions decreased with the increase of proportions of biodiesel-diesel blends and decreased first and then increased with the increase of fuel supplying advanced angle. Using Thermo-Gravimetric Analysis, the volatile organic fraction in the particulate emissions increased with the increase of the proportions of biodiesel in the blends; Volatile organic fractions peaked at the evaporation temperature of 150 ~ 300°C and the volatile organic fractions were more concentrated in the temperature range with the increase of percentage of biodiesel. With Transmission electron microscopy analysis, the sizes of average primary particle resulting from B20 were larger than that of B0; Graphitic lamella circumscribe voids within the interior of soot produced from B0; Lamella of primary particle resulting from BO was seen at all radial distances but with more random order and less parallelism than that of B20.