Detailed in-furnace measurements with reburning of superfine pulverized coal in high CO concentration.

This paper presents detailed measurements of gaseous species during the reburning process with high CO concentration in a bench-scale furnace. Superfine pulverized coal, with the average particle size below or around 20 μm, is used as the reburning fuel. The data of flue gas concentration (NO, HCN, NH, CH, O, CO, CO etc.) is obtained in order to reveal the intrinsic connection between NO emissions and other influential gaseous species at different positions of the furnace. The finding concludes that the advantage of superfine pulverized coal with regard to NO reduction is more efficient in homogeneous stage rather than heterogeneous stage. Meanwhile, the evolution of HCN and CH agrees well with each stage of NO reduction, which indicates that these gaseous species are favorable for NO abatement. Eventually, oxygen consumption rate for superfine pulverized coal is relatively faster, conducive to strengthen both homogeneous and heterogeneous NO reduction under CO reburning condition.