Study on Stirling Engine Combustor

In order to achieve NOx reduction by modification of the combustor and/or the combustor arrangement in Stirling engine, the effect of several parameters on NOx emission was investigated experimentally. The combination of appropriate “distance”, swirl intensity and burner throat configuration reduces the NOx emission without EGR(Exhaust Gas Recirculation) or any other countermeasures. The NOx and CO emissions obtained are within the Japanese exhaust gas regulation code (NOx<150ppmV, CO<100ppmV at residual Oxygen 5%) for 20kW class gas boiler. In addition, the effect of the parameters on the distributions of the chemical species, burned gas temperature and ion current in the combustion chamber of the model combustor was studied experimentally to grasp the combustion process.