PERFORMANCE AND EMISSION CHARACTERISTICS OF A DIESEL ENGINE FUELED BY RAPESEED OIL BIO-FUEL
Keywords:Diesel engine, diesel emission, straight vegetable oil, ethanol blend, emulsion
AbstractThis study had used straight vegetable oil (SVO) particularly neat rapeseed oil as a fuel in a direct injection diesel engine. Combustion performance and exhaust emissions of using the fuel have been measured from no load up to full load engine condition. For comparison diesel fuel JIS#2 have been used. SVO gives higher NOx but lower smoke emissions at high load compared with JIS#2. Lower smoke emissions at high load is due to oxygen content in the SVO that can eliminate partially unburned fuel at stratified fuel rich zone during combustion. Enhanced combustion raises the temperature inside the combustion chamber and caused higher NOx emission. In addition of using SVO as fuel, this study also had blend several percentages of ethanol into SVO with the presence of octanol as surfactant. As percentage of ethanol increased in this SVO-ethanol blend, smoke and particulate emissions reduced with unchanged NOx level. This is because the reduction of kinematic viscosity of SVO-ethanol blend improves the atomization and vaporization of injected fuel droplets that leads to lower particulate emission. Simultaneous reduction of NOx and particulate emissions can be obtained by transform the SVO into an emulsion fuel by blending some percentages of water into SVO with existence of castor oil as surfactant. Evaporation of water during combustion reduces the combustion temperature and causes the reduction of NOx emission. Reduction of particulate emission is due to water gas reaction. However, the use of SVO emulsion in diesel engine shows deterioration of CO and THC emissions.
Exxon Mobil, The Lamp (2004).
Hamasaki, K., et. al., â€œUtilization of Palm Oil for Diesel Fuelâ€, Trans. Jpn. Soc. Mech. Eng. 68(667), pp. 958-963, 2002.
Norbert, H., et. al., â€œPerformance, Exhaust Emissions and Durability of Modern Diesel Engines Running on Rapeseed Oilâ€, SAE Paper 910848, 1991.
Robert L.M., et. al., â€œRegulated Emissions form Biodiesel Tested in Heavy-Duty Engines Meeting 2004 Emission Standardsâ€, SAE Paper 2005-01-2200, 2005.
Carlo, N.G., et. al., â€œCommon Rail HSDI Diesel Engine Combustion and Emissions with Fossil/Bio-Derived Fuel Blendsâ€, SAE Paper 2002-01-0865, 2002.
Naruse, S., â€œJapanâ€™s Policy toward Energy Securityâ€, 2007 JSAE/SAE International Fuels and Lubricants Meeting, 2007.
Miva, K., Ueta, T., and Ishiyama, T., â€œEffect of Swirl on Particulate Emissions from Direct-Injection Diesel Enginesâ€. Trans. JSME. 57(538), pp.2159-2165, 1991.
Gerhard, K., and Kevin, R.S., â€Kinematic viscosity of bio-diesel fuel components and related compounds. Influence of compound structure and comparison to petro-diesel fuel componentsâ€, Science Direct, Fuel 84(2005) 1059-1065, 2005.
Gerhard, K., â€Dependence of biodiesel fuel properties on the structure of fatty acid alkyl estersâ€, Fuel Processing Technology, 86(2005) 1059-1070,2005.
How to Cite
Copyright of articles that appear in Jurnal Mekanikal belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions or any other reproductions of similar nature.