Effects of diesel engine speed and water content on emission characteristics of three-phase emulsions.
The effects of water content of three-phase emulsions and engine speed on the combustion and emission characteristics of diesel engines were investigated in this study. The results show that a larger water content of water-in oil (W/O) and oil-in-water-in-oil (O/W/O) emulsion caused a higher brake specific fuel consumption (bsfc) value and a lower O2, as well as a lower NOx emission, but a larger CO emission. The increase in engine speed resulted in an increase of bsfc, exhaust gas temperature, fuel-to-air ratio, CO2 emission and a decrease of NOx, CO emission, and smoke opacity. Because of the physical structural differences, the three-phase O/W/O emulsions were observed to produce a higher exhaust gas temperature, a higher emulsion viscosity and a lower CO emission, in comparison with that of the two-phase W/O emulsion. In addition, the use of W/O emulsions with water content larger than 20% may cause diesel engines to shut down earlier than those running on O/W/O emulsions with the same water content. Hence, it is suggested that the emulsions with water content larger than 20% are not suitable for use as alternative fuel for diesel engines.
Lin
Cherng-Yuan
CY
Department of Marine Engineering, National Taiwan Ocean University, Keelung, Taiwan, ROC. Lin7108@mail.ntou.edu.tw
Wang
Kuo-Hua
KH
D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D004738:Engineering; D004867:Equipment Design; D005742:Gasoline / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*; D014867:Water
D000393:Air Pollutants; D005742:Gasoline; D001335:Vehicle Emissions; D014867:Water; D002245:Carbon Dioxide; D002248:Carbon Monoxide