THE EMISSION CHARACTERISTICS OF A SMALL D.I. DIESEL ENGINE USING BIODIESEL BLENDED FUELS

Abstract

Biodiesel and biodiesel blends provide low emissions without modification on the fuel system of conventional diesel engines. This study aims to develop a new domestic biodiesel production procedure which makes use of waste fryer vegetable oil by transesterification method, and further investigates the emission characteristics of a small D.I. diesel engine using biodiesel blends and diesel fuels, respectively. The 20/80 and 30/70 blends of biodiesel to diesel fuel are used in this study. The emission characteristics include smoke emissions, gaseous emissions (CO, HC, NO_x and SO₂), particle size distributions and number concentrations at a variety of steady state engine speed points. We have found that diesel engine fueled with biodiesel blends emits more PM₂ particle number concentrations than those with diesel fuel, and PM₂ number concentration increases as biodiesel concentration increases. As for the smoke and gaseous emissions, such as CO, HC, NO_x and SO₂, the results favored biodiesel blends.

Keywords:

• Particulate
• Diesel engine
• Biodiesel blends
• Alternative fuel
• PM_2.5

Acknowledgments