煤粉燃烧中NOx和SOx生成的详细反应机理模拟

采用详细化学反应机理与CFD方法耦合的煤粉燃烧数值模拟程序，计算了煤粉燃烧过程中CO, NOx和SOx等的浓度分布特性. 通过与实验对照，验证了数值模拟方法的可靠性，并分析了燃烧温度和煤粉细度等因素对于NO生成的影响. 结果表明温度对于NO的生成影响较大，随着温度的增加，NO的生成浓度明显增加；对于不同煤种，可能存在一个温度点，这时NO的生成速率将非常快；在计算范围内，温度对SO2的最终生成浓度没有明显影响，而只影响SO2的释放过程. 煤粉细度对于NO生成有较小的影响.

MODELING OF THE NOx AND SOx FORMATION IN PULVERIZED COAL COMBUSTION WITH DETAILED REACTION MECHANISM

The present work introduces a numerical simulationapproach to calculate the concentration profiles of CO, NOx, andSOx, and study the effects of combustion temperature and pulverizedcoal particle size on NO formation during pulverized coal combustion coupledwith detailed chemical reaction mechanism and CFD software. The numericaldata are validated with the experimental ones. The results show that thereis significant effect of the combustion temperature and not obvious effectof coal particle size on the NO formation. Increasing temperature obviouslyenhances NO concentration. There might exist different temperature pointscorresponding to the fast rate of NO formation for various coals. Meanwhile,combustion temperature has effect on the release process of SOx andlittle effect on the final concentration of SOx.