Exhaust Gas Recirculation as a NO_x Reduction Technique for Modified POME Fuelled Diesel Engine

摘要

The exhaust gas recirculation (EGR) consists of reverting a certain portion of the exhaust gases into the engine cylinder. EGR dilutes the air-fuel mixture in the cylinder reducing the combustion chamber temperature and NO_x with a penalty in the value of brake thermal efficiency. EGR as a NO_x reduction technique for modified POME fuelled diesel engines has been investigated in the present work. The EGR rate is varied from 0% to 20% for the present study. An EGR rate of 10% has been optimized which results in the decrease in brake thermal efficiency by 3.4%, peak pressure (PP) by 5.6%, heat release rate (HRR) by 10.8% and oxides of nitrogen (NO_x) by 1.2% as compared to that without EGR. An increase in emissions such as carbon monoxide by 5%, unburnt hydrocarbons by 10.5% and smoke by 12.8% are observed.