VALIDATION OF NOX AND NOX PRECURSOR PREDICTIONS IN COAL FLAMES

To utilize currently available CFD-based predictive methods to assess NOx production in industrial coal flames, the confidence limits of the chosen NOx model must first be established. In this study, a simplifi ed strategy for NOx prediction is proposed and validated using measure ments of NOx and NOx precursors obtained from burning three different Canadian coals in two pilot-scale facilities. Validation results indic ate that the proposed NOx, model can provide reasonably good engineeri ng estimates of NO, HCN and NH3 from the near burner region to the fur nace exit in all test cases.