中文摘要：

在一维炉上采用煤粉作为再燃燃料进行了脱硝的实验研究，发现脱硝效率随再燃区氧浓度的增大呈现非单调的变化规律。采用煤粉气流均相着火模型和炭粒非均相热力着火模型对煤粉再燃脱硝效率与其着火状态的相互作用进行了研究。煤粉均相着火之前，脱硝效率随氧浓度的增加而上升，均相着火之后，脱硝效率明显下降并逐渐达到一个谷点。氧浓度进一步增大时，煤粉发生非均相着火，颗粒温度升高，异相脱硝效率升高，它的作用开始占优，总体脱硝效率再次上升。

英文摘要：

The experiment of pulverized coal reburning was performed with a one-dimensional furnace. The denitration efficiency presents a non-monotonic variation with the increasing oxygen concentration in reburning zone. The model for homogeneous ignition of pulverized coal stream and the model for heterogeneous ignition （TET） of pulverized coal char were adopted to investigate the relationship between denitration efficiency and ignition status of pulverized coal. The denitration efficiency increases with the increasing oxygen concentration before the volatiles are ignited; after that the denitration efficiency decreases greatly and reaches a valley point. With the further increase of oxygen concentration, the char is ignited. The particle temperature increases greatly, as a result the heterogeneous denitration efficiency begins to increase and dominate over the whole denitration efficiency which begins to increase again.