Engine performance and exhaust emissions from a diesel engine using soy bean oil biodiesel
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The objectives of this study are to evaluate the performance and relate exhaust emissions of biodiesel fuels derived from soybean oil and Standard no. 2 ultra low-sulfur diesel fuel, in a 3-cylinder YANMAR diesel engine. Engine power tests were conducted in accordance with SAE Standard Engine Power Test Code for diesel engines (SAE J1349 Revised MAR2008). Test fuels included Standard no. 2 diesel and four biofuels comprising 5%, 20%, 50% and 100% soybean oil biodiesel. Nitrogen oxides (NOX), carbon monoxide (CO), and sulfur dioxide (SO2) emissions were measured for all the test fuels using an Enerac model 3000E emissions analyzer. Based on the results of the experiments performed, the peak power produced using different blends of Soy bean oil biodiesel has no significant difference compared to that of the petroleum diesel. However, the brake-specific fuel consumption tends to increase as the percentage of biodiesel in a blend increases. Such an increase can be best described by the B50 SME and B100 SME test fuels. Furthermore, the relationship between pollutant concentrations in diesel engine exhaust and the percentage of soy bean oil biodiesel in fuel blends was also determined. There was a significant reduction in the emissions of pollutant concentrations (i.e. NOX and CO) as the percentage of biodiesel in a blend increased.
