Reduction of Nitrogen Oxides Emissions in a Single Cylinder Compression Ignition Engine Using Cool Exhaust Gas Recirculation System

Abstract

In various countries around the world, the emissions of NO_X from petrol/gasoline and diesel engine vehicles are restricted by legislation. NO_X is produced in the combustion chamber of engines at high temperatures and high pressure. One of the most promising technology for effective control of NO_X emissions is Exhaust Gas Recirculation (EGR) and now most modern engines require exhaust gas recirculation to meet emission standards. EGR lowers the presence of oxygen concentration and burn temperature in the combustion chamber and hence controls the NO_x. The experimentation was carried out on a 5.2 kW of single cylinder four stroke direct injection diesel engines in computerized mode to investigate the performance, emissions and combustion parameters at different EGR ratios (10, 20 and 30%). From the results, O_2,NO_Xand exhaust temperatures are found to be reduced whereas HC and CO emissions are increased as the EGR concentration increases.