| Autor: |
null Michael D. Kass, null Matthew M. Swartz, null Samuel A. Lewis, null Sr., null Shean P. Huff, null Doh-Won Lee, null Robert M. Wagner, null John M. Storey |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
2006 Portland, Oregon, July 9-12, 2006. |
| DOI: |
10.13031/2013.21511 |
| Popis: |
A key barrier limiting extended utilization of biodiesel is higher NOx emissions compared to petrodiesel fuels. The reason for this effect is unclear, but various researchers have attributed this phenonmena to the higher liquid bulk modulus associated with biodiesel and the additional heat released during the breaking of C-C double bonds in the methyl ester groups. In this study water was incorporated into neat biodiesel (B100) as an emulsion in an attempt to lower NOx and particulate matter (PM) emissions. When added to petroleum diesel, water has been shown to improve fuel/air mixing, reduce peak combustion temperatures, and increase mass during combustion, resulting in lower NOx and PM emissions with no fuel penalty. A biodiesel emulsion containing 10wt% water was formulated and evaluated against an ultra-low sulfur petroleum diesel (ULSD) and neat biodiesel (B100) in a light-duty diesel engine operated at 1500RPM and 50ft-lbs. The influence of exhaust gas recirculation (EGR) was also examined. The incorporation of water was found to significantly lower the NOx emissions while maintaining or improving fuel efficiency when operating at 0 and 27% EGR, while the total PM mass was lowered dramatically for the 27% EGR condition only. Analysis of the emissions and heat release data indicate that water enhances air-fuel premixing to maintain fuel economy and lower PM. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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