Unregulated emissions from a diesel engine fueled with biodiesel

Using the Thermal Desorber-Gas Chromatograph-Mass Spectrometer(TD-GC/MS), the unregulated pollutants emitted from a turbocharged direct-injection diesel engine were measured. Results show that emissions of aromatic compounds and total hydrocarbon are decreased with the increase of biodiesel. Using pure biodiesel, benzene emission reduces by 95%, toluene emission by 70%, xylems emission by 80%, ethylbenzene emission by 40% and total brake specific emission by 64% compared with those of diesel fuel at engine speed of 2,300,r/min and full load operating conditions. Biodiesel has lower ozone specific reactivity(SR)and is friendlier to environment than diesel. ESC test indicates that the emission of total volatile organic compounds(TVOC) is reduced by 42.98% and 53.23% in B20 blend and pure biodiesel compared with those of diesel fuelled engine.