02006nab a2200193 4500 20260520000904.0 260224s2010 xxu Simplified model for reburning chemistry jul./ago. 2010 23/11/2010 ; 23/11/2010 8 p. ; 4185–4192 Transcripción del resumen del autor. In solid fuel flames, reburn-type reactions are often important for the concentrations of NOx in the near-burner region. To be able to model the nitrogen chemistry in these flames, it is necessary to have an adequate model for volatile/NO interactions. Simple models consisting of global steps or based on partial-equilibrium assumptions have limited predictive capabilities. Reburning models based on systematic reduction of a detailed chemical kinetic model offer a high accuracy but rely on input estimates of combustion intermediates, including free radicals. In the present work, an analytically reduced nitrogen scheme is combined with simplified correlations for estimation of O/H and hydrocarbon radicals. Correlations are derived for volatile compositions representative of solid fuels ranging from bituminous coal to biomass, for temperatures of 1200-2000 K and excess air ratios in the range of 0.6 = = 2.0. The combined model is tested against reference calculations with a comprehensive mechanism. The results indicate that the approximations in the simplified hydrocarbon radical scheme are satisfactory. However, when this scheme is combined with the semi-empirical correlations for the O/H radicals, the modeling predictions for the radicals become less accurate. Despite these deviations, the combined model provides a satisfactory prediction of NO under reburning conditions over the range of fuels, temperatures, and stoichiometries tested. 4 Energy & fuels 24 ARTICULO Hansen, Stine 43793 Glarborg, Peter 42345 172049 172049 0 0 0 0 239868 BAAB BAAB 2026-03-05 200050019 0 200050019 2026-03-05 16:07:48 2026-03-05 ARTICULO