A Review on Effect of Exhaust Gas Recirculation (EGR) in Diesel Engines

Exhaust gas recirculation (EGR) system means to use the exhaust gas coming from exhaust manifold to inlet manifold in order to reduce the emission of NO_X, which is particularly very harmful. Engine without EGR are more pollutant & uses more atmospherically air for combustion. By implementation of EGR system in engine, the partial exhaust gas is re-circulated again in engine. It is first cooled in EGR cooler & then it is mixed with atmospheric air & then passed to combustion chamber. Fresh atmospheric air required is reduced & automatically pollutant (CO, CO₂, HC, NO_X etc.) is reduced. The aim of this work is to review the potential of exhaust gas recirculation (EGR) to reduce the exhaust emissions, particularly NOX emissions, and to delimit the application range of this technique.