REDUCTION OF OXIDES OF NITROGEN EMISSIONS IN SINGLE CYLINDER DUAL FUEL ENGINE USING EXHAUST GAS RECIRCULATION AND VARYING PRESSURES

This is a well-known fact that the oxides of nitrogen emitted as exhaust from an internal combustion engines effect negatively on environment and human health. A single-cylinder diesel engine has been converted into a dual-fuel engine to operate with natural gas together with a pilot injection of diesel fuel used to ignite the CNG-air charge. The CNG was inducted into the combustion chamber via intake manifold. Injection pressures in dual fuel engines will play a vital role in engine performance and emissions released. This paper focused on reduction of oxides of nitrogen emissions of CNG inducted duel fuel diesel engine by introducing hot exhaust gas recirculation and increasing fuel injection pressures. An experimental investigations were carried out to find out the effect of injection pressure on performance and emissions of a diesel engine operated with CNG inducted into the engine. Experiments have been conducted on a single cylinder, 4 stroke compression ignition engine. Behavior of the engine at 10%, 20%, 30%, 40% and 50% substitution of CNG with respect to Diesel was examined and compared them at different injection pressures at various EGR substitutions.