Studies on CNG-Biodiesel fuelled CI Engine using EGR

In this work, experiments were carried out to determine the performance, combustion and emissions characteristics of dual fuel engine using small quantities of compressed natural gas (CNG) in a compression ignition engine primarily fuelled with a B20 blend of jatropha biodiesel. The engines, which utilizes both the gaseous fuel, and liquid pilot fuel is referred to dual fuel engine. The primary usage of dual fuel system is to minimize the consumption of diesel and reducing the pollutants formation. B20 blend of biodiesel was chosen as it is optimum based on the trade-off of smoke and NOx emissions. A single cylinder air cooled direct injection commercial diesel engine was chosen for present research work. The B20 blend was injected into the diesel engine as that of the conventional diesel engine. The CNG flow rate was varied on energy substitution basis (0~ 80%) and data were recorded at different loading points i.e. 20%, 40%, 60%, 80% and 100% of brake power. All the experiments were performed at constant speed of 1500 rev/min. Test results were compared with baseline diesel operation.