EFFECTS OF THERMAL NOx REACTIONS ON SNCR PROCESS

摘要

In this study, the effects of Thermal NOx reactions in selective non catalytic reduction (SNCR) denitrification process on simplified mechanism model were investigated by numerically modeling the reaction mechanism of SNCR, through applying the models of perfect stirred reactor (PSR), plug flow reactor (PFR) and the detailed chemical reaction kinetics model proposed by Rota. The simplified mechanism model was obtained through sensitivity analysis and quasi steady state assumption (QSSA) methods. The obtained model has 15 components and 20 steps of elementary reactions. The influence of different parameters on denitrification efficiency was studied, including reaction temperatures (1073~1473K), Normalized Stoichiometric Ratios (NSR, 1.0~1.5) and reaction times (0.01~1s). The results show that at high temperature region (1273~1423K), the Thermal NOx reactions significantly influenced SNCR reaction process and this simplified mechanism model could predict SNCR reaction more accurately than the common simplified model without considering Thermal NOx reaction. Thus, the results from this model became more practical at high-temperature area, through adding the Thermal NOx reactions into the simplified mechanism models of SNCR reaction process.