生物柴油对能源和环境影响的研究

基于美国能源部的生物柴油统计数据，利用生命循环分析法，对生物柴油从生产到消耗的生命循环中的能量消耗和产出、循环中的排放以及生物柴油汽车尾气排放等方面进行了分析。分析结果表明：生物柴油循环的石化能效比提高，大约是柴油的4倍；生物柴油循环中CO2排放降低，大约降低了78.4%；发动机排气管有害物质的排放中，除NOx排入增加8.89%外，CO、HC、PM等有害物质的排放大幅度降低。

A Study on the Environment and Energy Effects of Biodiesel

Based on the statistic data of DOE(the U.S. Department of Energy), we analyze the energy cycle of biodiesel by the method of so called "life cycle analysis". It includes the energy consuming and yielding, emissions and tailpipe emissions. The result shows that the fossil energy ratio of biodiese is four times that of petroleum diesel; the life cycle emissions of CO 2 are much lower. Biodiesel reduces net CO 2 emissions by 78% compared to petroleum diesel. On the other hand, the emissions of the tailpipe such as CO, HC and PM are much lower for biodiesel than those for petroleum diesel except the NO x , which increasing by 8.89% instead.