NUMERICAL-SIMULATION OF THE OIL COMBUSTION PROCESS IN A 100 KW SERIALLY PRODUCED LOW NOX COMBUSTION SYSTEM

Modern low NOx domestic oil and gas burners use the effect of flue gas recirculation to lower combustion temperature and hence to reduce the amount of NO being formed. Because these burners do take flue gas fro m the combustion chamber and mix it with primary air, a strong interac tion is possible between the burner and the boiler. This interaction h as to be taken into account particularly for the jet pump type of flue gas recirculators, because it can lower the rare of recirculation and hence increase the NOx emissions drastically. Numerical simulations ( CFD) of the oil combustion process within a commercially available dom estic burner have been carried out. Extensive comparison with experime ntal data (LDV, PDPA, LIF, probe) shows the achievable accuracy of num erical simulations for such complex geometry's nowadays. The final dis cussion gives reasons for the differences between simulations and meas urements and shows the necessariness of further developments concernin g the oil model.