SIMULTANEOUS REDUCTION OF NOX AND SMOKE EMISSIONS IN GASOLINE-ETHANOL BLENDED RCCI ENGINE WITH BIOGAS AS A TERNARY FUEL
Pranay Deshwar, G. Mohan Kumar, Balaji Subramanian, Shreyash Hemant Panchal, T. Venugopal, Saleel Ismail, M. Feroskhan
Abstract
Reactivity controlled compression ignition (RCCI) is a type of engine combustion that occurs at relatively low temperatures and also results in the reduction of tailpipe emissions such as NOx and soot emissions while improving the thermal efficiency. In this study, gasoline−ethanol blends with different volume fractions and diesel are used as low- and high-reactivity fuels, respectively. RCCI mode was achieved by injecting diesel through conventional direct in-cylinder injection and gasoline−ethanol blend through port injection. The injection timing was controlled by a simple Arduino-based controller. Biogas was supplied via the intake manifold during suction stroke to reduce diesel consumption. Performance and emission tests were conducted with the introduction of gasoline−ethanol blend ratios of E0, E10, E20, and E30, with different blend flow rates and torque conditions. The results are compared to conventional neat diesel operation and dual fuel modes. E30 shows better brake thermal efficiency than all other blend ratios. Biogas addition reduces the brake thermal efficiency due to incomplete oxidation. However, it reduces diesel consumption and NOx and smoke emissions compared to dual fuel mode. RCCI mode with biogas shows better performance and emission characteristics at high load. Simultaneous reduction of NOx and smoke emission is observed for RCCI mode with biogas as a ternary fuel.