AI Article Synopsis
- The study used the Engine Exhaust Particle Sizer (EEPS) to analyze particle emissions from a China-IV diesel bus running on various biodiesel blends, including blends with 5%, 10%, 20%, and 50% biodiesel from restaurant waste oil.
- It found that as bus speed and acceleration increased, both particulate number (PN) and mass (PM) emissions also rose, but increasing the biodiesel content led to a decrease in overall particulate emissions.
- Particulate size distribution varied with bus performance, showing a shift from bimodal to unimodal patterns during acceleration, with higher biodiesel blends resulting in reduced PN emissions and smaller particle sizes.
Article Abstract
With the use of the Engine Exhaust Particle Sizer (EEPS), a study on the characteristics of particle emissions was carried out on a China-IV diesel bus fueled with blends of 5% , 10% , 20% , 50% bio-diesel transformed from restaurant waste oil and China-IV diesel (marked separately by BD5, BD10, BD20, BD50), pure bio-diesel (BD100) and pure diesel (BD0). The results indicated that particulate number (PN) and mass (PM) emissions of bio-diesel blends increased with the increase in bus speed and acceleration; with increasing bio-diesel content, particulate emissions displayed a relevant declining trend. In different speed ranges, the size distribution of particulate number emissions (PNSD) was bimodal; in different acceleration ranges, PNSD showed a gradual transition from bimodal shape to unimodal when bus operation was switched from decelerating to accelerating status. Bio-diesel blends with higher mixture ratios showed significant reduction in PN emissions for accumulated modes, and the particulate number emission peaks moved towards smaller sizes; but little change was obtained in PN emissions for nuclei modes; reduction also occurred in particle geometric diameter (Dg).
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