NO_x and N₂O emissions from an ultra-supercritical circulating fluidized bed (CFB) boiler were predicted using a two dimensional (2-D) comprehensive computational fluid dynamics (CFD) combustion model. This model was developed from a three dimensional model for a supercritical CFB boiler previously constructed by our group. Based on an analysis of the NO_x and N₂O conversion processes in a CFB boiler, the primary formation and destruction reactions were introduced into the 2-D model and coupled. The resulting model was validated using data from the Baima 600 MW supercritical CFB boiler, and then applied to a 660 MW ultra-supercritical CFB boiler. The effects of excess air, the secondary air (SA) to (primary air (PA) plus SA) ratio and the SA injection height on NO_x and N₂O emissions were investigated. The results show that a higher excess air volume increases both NO_x and N₂O emissions, while increasing the SA/(PA + SA) ratio somewhat reduces both the NO_x and N₂O concentrations. On the basis of the results of this work, optimal locations for SA injection ports so as to lower NO_x and N₂O emissions are recommended.

使用二维（2-D）综合计算流体动力学（CFD）燃烧模型预测了超超临界循环流化床（CFB）锅炉的NO _x和N ₂ O排放。该模型是由我们小组先前建造的超临界CFB锅炉的三维模型开发的。基于NO _x和N _2的分析在CFB锅炉中进行O转化过程，将最初的形成和破坏反应引入二维模型并进行耦合。使用来自Baima 600 MW超临界CFB锅炉的数据验证了所得模型，然后将其应用于660 MW超超临界CFB锅炉。研究了过量空气，二次空气（SA）与（一次空气（PA）加SA）之比以及SA注入高度对NO _x和N ₂ O排放的影响。结果表明，较高的过量空气量同时增加NO _X和N _2个O排放，同时增加了SA /（PA + SA）比有所减少了在NO _X和N ₂O浓度。在此工作的结果的基础上，对于SA喷射口的最佳位置，以降低NO _X和N ₂ O排放，建议。