Assessment on Performance, Combustion and Emission Characteristics of Diesel Engine with Alternative Fuel 2019-26-0091
Due to higher NOx and PM emissions Compression Ignition (CI) engines are slowly being replaced by gas engines in metro cities though CI engine have better thermal efficiency and emit less Carbon monoxide (CO) and Unburned Hydrocarbons (UHC) emission than SI engines. Depleting fossil fuel reserves and frequent rise in fuel price also pushes the research community to find new alternative fuels which can be used along with diesel or replaces the diesel without making major modifications in the current engine. The objective of this research work is to derive bio-diesel fuel from the source of algae and use it as a fuel by blending with commercially available diesel fuel. Heptanol is added along with algae bio-diesel and diesel blend to improve the ignition quality of the blend. Tests were conducted on a single cylinder constant speed stationary diesel engine at different blends of heptanol-biodiesel-diesel. Convention diesel operation results are taken as benchmark. The experimental results obtained for seven different types of blend proportions were compared with baseline diesel values. This research study reveals significant reduction in HC, CO and NOx emission with increase in smoke. Amongst these seven samples maximum of 14.7% NOx emission was reduced by S6 blend. The maximum Brake Thermal Efficiency (BTE) of 34.96% is also achieved for the same S6 blend which is a combination of 10% heptanol and 20% biodiesel blend at maximum load. On overall comparison, sample S6 founds to be good to operate in conventional diesel engine without any modification which gives increased BTE, reduced CO, HC, NOx and slight increase in smoke emissions.