In this paper

coal combustion and NOx formation are studied at the exit of the swirl burner with a pulverized-coal concentrator by using numerical simulation. The detailed information of thermal NOx and fuel NOx is given.The results indicate that the pulverized-coal concentrator with weak swirl can remarkably reduce fuel NOx formation and simultaneously can keep a higher burn-out rate. The results also show that NOx formation is mainly controlled by fuel NOx

and the ratio of thermal NOx to total NOx is low.Therefore the swirl burner with pulverized-coal concentrator has the performance of high efficiency and low NOx formation.