| During pulverized coal (pc) combustion, nitrogen in the coal can be oxidized to form nitrogen oxides (NO;Experiments were conducted in the U furnace, refractory-lined combustion research facility with a nominal firing rate of 29 kW and a combustion chamber diameter of 16 cm. The U furnace was equipped with a premixed burner to ensure a well-mixed, uniform flame. Coal chars were prepared by firing the U furnace with pulverized coal and then collecting the partially-oxidized coal from a port near the burner. Chars were collected from three bituminous, one subbituminous, and one lignite coal. A commercially-obtained char made from coconut shells was added to the experimental matrix.;The chars were subsequently burned in a simulated coal flame consisting of natural gas (to simulate coal volatiles) and coal char; NH;Parametric studies with the coal chars revealed that the amount of NO;Tests with the commercially-obtained char suggest that NO reduction on char carbon is not the most significant source of NO;The char-N data in this study can be interpreted using either a homogeneous or heterogeneous char-N model. However, regardless of the model chosen, these data show that the accurate prediction of NO... |
