Experimental Investigation on the Effect of DEE Addition in a Biogas-Biodiesel and Biogas-Diesel Fueled Dual-Fuel Engine

Nowadays, biodiesel is an encouraging perspective that attracts researchers to utilize it as an alternative fuel in this fast-growing society. It is also a cause of engine performance collapsing due to less energy per unit volume. The present study compares the effect of DEE addition on the emission and performance characteristics of biogas-biodiesel and biogas-diesel fueled dual-fuel engines. Here, a typical single cylinder CI engine is used in a dual-fuel mode, where the primary fuel utilized is biogas, and diesel and biodiesel (palm oil) are used as secondary fuel with a DEE blending ratio of 5%. Effect of DEE addition on volumetric efficiency, brake-specific energy consumption, brake thermal efficiency, CO, HC, and NOx emissions is studied for diesel and biodiesel blends. The AVL 5-gas emission analyzer was used to measure the exhaust gas emissions; while for few samples, density and calorific value have also been measured. A high-brake thermal efficiency increase of 3.46% was observed in the experiments when 5% DEE used with 12 lpm biogas flow rate in both fuels. Also, a decrease in load decreases NOx emission and escalates HC emission in both fuels. The optimal emission characteristics and engine performance were built up to a greater extent due to DEE being used as an ignition improver during the experiment.