Characteristics analysis for total volatile organic compounds emissions of methanol-diesel fuel

To study the characteristics of volatile organic compounds (VOCs) emissions from an engine fueled with methanol diesel, an experiment compared with petroleum diesel (0# diesel) and biodiesel was carried out on a Xichai 4CK diesel engine test bench by the solid phase adsorption-thermal desorption-gas chromatography mass spectrometry method. In this experiment, methanol-diesel (20 vol.% methanol), petroleum diesel and biodiesel were analyzed through the sampling system, which consists of Tenax TA adsorption tubes, flow sampling pump, the capillary gas chromatography-mass spectrometry (CGC/MS), etc. The experimental results demonstrate that total volatile organic compounds (TVOC) emissions of methanol diesel are lower than petroleum diesel but higher than biodiesel at maximum power, and that TVOC emissions of methanol diesel reduce with the rise of load but increase when the rotation speed of engine gets faster. And benzene and toluene are two main components of TVOC emissions of methanol diesel, accounting for more than 70% at rated power. Therefore, this study can provide a theoretical basis for popularization and development of methanol-diesel fuel in the future, meanwhile, contributing to make relative regulations and standards to control its emissions.