Factors Influencing the Reburning Process in a Tangentially-Fired Pulverized Coal Furnace

Abstract

A numerical simulation of bituminous coal reburning in a full-scale tangentially-fired boiler has been conducted with CFD method in order to study the effects of reburn zone length, the height of reburn nozzles, the stoichiometric ratio in reburn zone, the reburn fuel fraction and the reburn coal fineness on NO x reduction efficiency and unburned carbon in fly ash. The results indicate the largest value of NO x reduction efficiency relative to the height of reburn nozzles zone; the increase of NO x reduction efficiency with reburn zone length, reburn fuel fraction and the decrease of reburn coal particle size; the increase of burnout performance of coal relative to the coal particle size.