Experimental investigation to study combustion and emission characteristics of diesel engine by application of EGR and heated intake air

Abstract

Diesel engines are widely used over petrol engine due to their higher torque and higher thermal efficiency. However, the major problem of diesel engine is that it produces carbon dioxide which contribute in greenhouse gas emissions. The recent stringent norms about engine pollution needs to focus on the techniques to reduce the exhaust emissions. The exhaust gas loss is an important loss which affect the performance of engine fueled with diesel. The attempt of implementing systematic designed exhaust gas recovery system was examined for various test modes of diesel engine. A heat exchanger of counter current shell and tube type based heat recovery technique was developed and implemented to heat intake air of the engine and the effects of heated air on diesel engine characteristics studied. The exhaust gas recirculation(EGR) method was also employed for 6 % & 12 % EGR with and without heat exchanger and studied its effects on engine characteristics. The experimentation was conducted on kirloskar make four stroke diesel engine for varying load and at constant speed 1500 rpm for six different test modes of diesel including base diesel test mode. The six modes tested were 1: Base Engine (Diesel WHE) 2. Base Engine test mode withoutHeat Exchanger and with 6 % EGR (DIESEL WHE 6 % EGR) 3.: Base Engine test mode withoutHeat Exchanger and with 12 % EGRN(DIESEL WHE 12 % EGR) 4: Engine withHeat Exchanger (DIESEL HE 0 % EGR) 5: Engine test mode DIESEL HE 6 % EGR) 6. Engine test DIESEL HE 12 %EGR. The experimental results indicate that mechanical efficiency increased by 8.3 % for test mode of Diesel WHE 12 % EGR than base engine condition. The application of heat exchanger indicated improved CO2 emission in the engine exhaust The test mode of diesel WHE 12 % EGR reported higher in cylinder pressure and higher amount of heat release 52.5 J/ °CA at full load.