超细煤粉空气分级燃烧NOx排放规律研究

Superfine pulverized coal combustion is a new pulverized coal combustion technology that has better combustion stability,higher combustion efficiency,and comprehensive cost-effective operation. The novelty of this present article is that fundamental experiments on an electrically heated drop-tube furnace were carried out in order to understand the NOx emissions of air-staging combustion for two superfine pulverized bituminous coals used in China for the first time. The results indicate that high-volatile-containing NMG coal possesses better effectiveness of NOx abatement than low-volatile-containing SH coal. Interesting saddle-point effects of highest NOx emissions have been found for both two coals around the average particle size of 17.44μm for SH coal and ~30μm for NMG coal, respectively. For different stoichiometric ratios and positions of OFA ports, NMG coal provides a higher ability of deNOx efficiency than SH coal. The superfine pulverized coal combustion of NMG_25.86μm particle can even reach the highest deNOx efficiency up to 70%. The findings of this article will provide guidance for further studies on the NOx emission characteristics of superfine pulverized coal combustion.