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Effect of Biodiesel Blending on Emission Characteristics of Modern Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 06, 2008 by SAE International in United States
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The use of biodiesel fuels as an alternative fuel for petroleum diesel fuel is very effective for the reduction of CO2 emission, because biodiesel is produced from renewable biomass resources. Biodiesel is usually blended to conventional diesel fuel in various proportions. It is possible that this biodiesel blending causes the problems on emission characteristics of modern diesel engine, because it could be confirmed that the application of neat biodiesel to modern diesel engines whose control parameters were optimized for conventional diesel fuel deteriorated the emission performances. It is necessary to clarify the effect of biodiesel blending on exhaust emissions of modern diesel engine.
Rapeseed oil methyl ester (RME) was selected as a biodiesel used in this study. Biodiesel blended fuels were applied to the multi-cylinder light-duty diesel engine which included the various latest technologies for low emission (e.g. common-rail injection system, cooled-EGR system, variable geometry turbocharger (VGT), and aftertreatment systems).
RME blending increased in engine-out NOx emission, as mentioned by many researchers. The main reason for that is a decrease in EGR rate with blending RME. In addition, an increase in NOx emission by RME blending was clarified more at tail-pipe, because the rich spike blended with RME for lean NOx trap (LNT) degraded the NOx reduction performance of LNT. An increase in oxygen content in the fuel with blending RME caused the drastic reduction of engine-out smoke emission, but high blending rate of RME increased tail-pipe PM emission. This is caused by an increase in soluble organic fraction (SOF) emission derived from poor volatility of rich spike which contains the large amount of RME. The results of JE05 transient mode test showed the same tendency of tail-pipe emissions at steady-state operation as mentioned above.
These test results denoted that biodiesel blending led to a simultaneous increase in NOx and PM emissions of modern diesel engine without engine modifications. However, the optimizations of intake air and rich spike injection conditions according to blending rate of biodiesel will make it possible to meet the future emission regulations.
CitationKawano, D., Ishii, H., and Goto, Y., "Effect of Biodiesel Blending on Emission Characteristics of Modern Diesel Engine," SAE Technical Paper 2008-01-2384, 2008, https://doi.org/10.4271/2008-01-2384.
- “Kyoto Protocol to the United Nations Framework Convention on Climate Change” The 3rd Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change 1997
- United States Environment Protection Agency (EPA) A Comprehensive Analysis of Biodiesel Impacts on Exhaust Emissions Draft Technical Report 2002
- Ministry of the Environment of Japan “Future Policy for Motor Vehicle Emission Reduction (Eighth Report)” 2005
- Kawano, D. Ishii, H. Goto, Y. Noda, A. Aoyagi, Y. “Application of Biodiesel Fuel to Modern Diesel Engine” SAE Paper 2006-01-0233 2006
- Fujimura, T. Matushita, S. Tanaka, T. Kojima, K. “Development towards serial production of a Diesel passenger car with simultaneous reduction system of NOx and PM for the European market” 23 rd International Vienna Motor Symposium 2002
- Szybist, J. P. Boehman, A. L. “Behavior of a Diesel Fuel Injection System with Biodiesel Fuel” SAE Paper 2003-01-1039 2003
- Cheng, A. S. Upatnieks, A. Mueller, C. J. “Investigation of the impact of biodiesel fuelling on NOx emissions using an optical direct injection diesel engine” International Journal of engine Research 7 297 318 2006
- Ohki, H. Ishiyama, S. Asano, A. “Control Technology for a Passenger Car Diesel Engine Equipped with the DPNR System” 2003 JSAE/SAE International Spring Fuels & Lubricants Meeting, 2003-01-1880 2003
- Heywood, J. B. “ Internal Combustion Engine Fundamentals ” McGraw-Hill New York 592 1988
- Kitamura, T. Ito, T. Senda, J. Fujimoto, H. “Mechanism of Smokeless Diesel Combustion with Oxygenated Fuels Based on The Dependence of The Equivalence Ratio and Temperature on Soot Particle Formation” Int. J. Engine Research 3 4 223 248 2002