Exhaust Gas Recirculation (EGR) ? Effective way to reduce NOx emissions

This paper gives insight into usage of water cooled Exhaust Gas Recirculation (EGR) for a twin cylinder direct injection compression ignition engine to reduce oxides of nitrogen (NOx) emission from engine exhaust. Different rates of EGR from 5% to 20% in step of 5% are used for varying loads from 25% to 100% in step 25% each. From the experimental investigation it is concluded that usage of EGR will decrease NOx formation inside the combustion chamber and it decreases with increase of EGR rates and Loads. The maximum reduction is around 80% fo r full Load condition at 20%EGR rate when compared against without EGR condition .