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Selective non-catalytic reduction (SNCR) has become an important technique for reducing NOx emissions in industrial furnaces. The occurrence of convective recirculation can cause significant changes in SNCR performance. This paper presents the results of a study performed by Computational Fluid Dynamics (CFD) considering: (i) changes of initial NO X ; (ii) injection plan and (iii) NH 3 /NO molar ratio. The simulations have demonstrated that the convective recirculation (resultant from differentdoi:10.1590/0104-6632.20170344s20150420 fatcat:wwhuqh5fcjcthgihjpzofkacpm