Effects on Performance, Emission and Combustion Characteristics of Dual Fuel Mode CI Engine Operated with Waste Cooking Oil - Ethanol as Fuel

Waste cooking oils (WCOs) are renewable and in nature can be directly used as fuel into the compression ignition engines. However, the reduction in brake thermal efficiency and increasing smoke emission and oxides of nitrogen need to be solved. There are more techniques used past researchers to improves the performance and reduced the emissions characteristics of WCO. In this present work, an experimental investigation made on the effect of ethanol on engine's behavior using Waste Cooking oil (WCO) based dual fuel diesel engine. A single-cylinder diesel engine was operated and modified the intake to operate dual fuel mode at the maximum power output of 3.54 kW. Ethanol is introduced as primary fuel into the intake manifold and WCO as pilot fuel. The ethanol energy share (EES) of the total fuel was varied from 5% to 40% with a step of 5%, at fixed engine speed equal to 1500 rpm. The test results show that significant improvements in brake thermal efficiency (BTE) of the engine at maximum brake power also the oxides of Nitrogen (NOx), and smoke emissions decreased with an increasing percentage of EES. In combustion, there were sharp increases in peak in-cylinder pressure and the peak heat release rate values with the increased while the engine was operated with dual fuel mode at maximum brake power.