Fuel effects on particulate emissions from D. I. engine part 3. precise analytical methods of diesel fuel

摘要

Particulate matter (PM) exhausted from a diesel engine is produced mainly from diesel fuel.In Part 2, of this papers series the ratio of hydrogen to carbon in the whole fuel (H/C) and the back end fraction at the temperature corresponding to T{sub}80-T{sub}90 (e.g. 310°C), R{sub}310, were found as the parameter showing the tendency of the fuelto form soot and the parameter closely related to SOF, respectively. As a result, the regression equation consisting of H/C and R310 was found to be effective in estimating PM emission.Considering more advanced reformation of diesel fuel in future, the evaluation with inclusive parameters, such as H/C, will be insufficient to examine the relationships between fuel properties and PM emissions, and more precise evaluation of diesel fuelwill be required.In this study, to construct a series of precise analytical methods, evaluation of the distribution of hydrocarbon by double bond equivalence value (DBE), which corresponds to H/C distribution, and that of the amounts of carbon in the different partialstructures, such as straight chain and branch, were added to the conventional methods, such as elementary analysis and high pressure liquid chromatography.As the methods to obtain DBE distribution and the amounts of carbons in different structures, field ionization mass spectrometry and nuclear magnetic resonance spectrometry were studied, respectively. The high pressure liquid chromatography fractions forthese analyses were concentrated by the enricher which was developed in this study. The precise analytical methods were applied to the analyses of commercial fuels in Japan and Sweden to ascertain the validity of the methods.