Study Of Biodiesel Life Cycle Assessment And Low Temprature Combustion Engine

With the fast development of Chinese Auto industry, the shortage of crude oil and air pollution become more and more urgent. Thus the development of alternative fuel and high efficiency, low emission engine have important realitic significance. Biodiesel,as a renewable energy and low emission fuel, not only can reduce the engine emissions, but also relieve shortage of oil in China, finally play a indispensable role in future energy diversification.Biodiesel is mainly derived by oil-bearing crops and residual cooking oil. Due to convenient collection and low price, the biodiesel derived by residual cooking oil already got preliminary development. In this study,we choosed the biodiesel derived by residual frying oil as object, calculated the energy consumption and environmental emissions by life cycle assessment model and make a comparison with traditional diesel path, the outcome showed the fossil energy consumption decreased by 65.7%, CO2 emission decreased by 88.1%, creterial emissions also had a general reduction. It showed that the biodiesel is an environmental-friendly alternative energy which fits the trend of fossil energy-saving.In order to reduce engine emissions further, LTC research was conducted in this study with biodiesel-ethanol blends and high EGR ratio, taking the means of blending of biodiesel and ethanol and high EGR ratio. The analysis of the output data showed the experiment reduced NOx and Soot simultaneously. The combustion phasing and its affection to emission and engine efficiency are also analyzed.