Effect of Biodiesel Composition on Engine Emissions from a DDC Series 60 Diesel Engine. Final Report Report 2 in a Series of 6

摘要

The National Renewable Energy Laboratory (NREL) is conducting an investigation of various biodiesel fuels produced from waste oils. As a part of this study, data on emissions on the Environmental Protection Agency (EPA) heavy-duty transient cycle have been measured to demonstrate the sensitivity of engine emissions to biodiesel ester composition. The objective of the investigation was to determine the effect of biodiesel source material and ester molecular structure (number of double bonds and chain length) on particulate matter (PM), nitrogen oxides (NOx), and certain unregulated pollutants. Testing included a series of fuels consisting of nearly pure fatty acid esters with different chain lengths and numbers of double bonds, as well as a number of fuels from practical feedstocks. A detailed analysis of the data was performed in an effort to determine how fuel chemistry and fuel properties correlate with the increase in NOx emissions observed for many biodiesels here, and in most previous studies.