A Proposal of Quantitative Analysis Method of Emission Characteristics of Biodiesel Fuel in Diesel Engine

In this study, the exhaust characteristics of the diesel engine for the change of the mixing ratio of biodiesel fuel were quantitatively analyzed by using the numerical analysis method As the fuel in the experiment, the diesel and biodiesel (waste cooking oil, soybean oil), mixture BD2 (diesel only), BD3, BD5, BD20, BD50 and BD100 were used The injection pressure (p(inj)) was set at 400 bar 600 bat; 800 bar 1000 bar and 1200 bar as the experimental variables. The concept of the standard deviation, Pearson's correlation coefficient and Spearman rank-order correlation coefficient based on the statistics were introduced in order to analyze the exhaust characteristics of the quantitative NOx and Soot according to the injection pressure and the mixing ratio of biodiesel blended fuel. The regression method was introduced in order to obtain the increasing and decreasing aspects of NOx and Soot that can not be known from the correlation coefficients alone. From the study it is inferred that, for the waste cooking oil, NOx and Soot can be simultaneously reduced through control of the mixing ratio in the region of p(inj)=400 bar and p(inj)=600 bar, and the Soot can be reduced without affecting the emission of NOx for p(inj) more than 800 bar For the soybean oil, NOx and Soot can be simultaneously reduced at p(inj)=400 bar and the Soot can be reduced without affecting the emission of NOx at p(inj)=600 bar