| Summary: | 碩士 === 嘉南藥理科技大學 === 環境工程與科學系碩士班 === 94 === Abstract
Gasoline powered motorcycle engine was used to evaluate the two-phase emulsion fuels as an alternative additive. Although gasoline oil emulsion had adverse effect on engine and good for the formation in particular nitrogen oxides. In this study, two commercial gasoline were emulated by adequate fractions of Span-80 and water under ultrasonic vibration processes. Two phase emulsions as water-in-oli was fueled for small single spark engine to analyze polycyclic aromatic hydrocarbons (PAHs) in the exhaust of tailpipe. Twenty-one individual PAHs were primarily analyzed by gas chromatography equipped mass spectrometer (GC/MSD). The 4-stroke motorcycle engines were installed on a dynamometer to simulate 3 various transient modes including idling, 30 km/hr and 50 km/hr.
In this investigation, emulsion gasoline powered engine had lower PAHs emission concentration than two commercial gasoline powered engines exclude C95W20. However, the more Span-80 and water in emulsion gasoline would increase the total PAH emission. For the BaP equivalent concentration, C95W20 would emit the highest BaPeq concentration (137 ug BaPeq/Nm3) among those emulsion gasolines. The lowest emission concentration was emitted by T98W5 emulsion gasoline for 14.6 ug BaPeq/Nm3. The BaPeq concentration comparison of target gasolines, C95W5, C95W10, and C95W20 had more BaPeq emission than C95-LFG. It reveals that C95-LFG may not be the basis gasoline for emulsion. For all emulsion gasolines would increase the BaPeq emission under adding more Span-80 and water.
Indeed, the two-phase emulsion gasoline will decrease the PAHs emission from 4-stroke motorcycle engines. However, the proper emulsion conditions will deplete the PAH and its BaPeq emission in the exhaust of tailpipe. For these two commercial gasoline, T95-LFG is better than C95-LFG to mix as emulsion gasoline.
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