【摘要】 由于化学动力学数据的缺乏及其它因素,目前对于燃烧中汞的排放和转变机理的研究主要局限于化学热力学计算和试验研究。该文在CFD、化学热力学计算的基础上用数学模型预测了煤燃烧过程中汞的分布及排放,在模型中考虑了气态汞与烟气组分或其它化合物的化学反应、气态汞的冷凝以及颗粒物的气溶胶动力学等因素的影响。最后对实验室台架上的煤粉燃烧进行数值计算,得到的汞在灰中富集因子与试验结果比较吻合。更多还原

【Abstract】 Due to lacking of the dynamic data of chemical reactions, a study on the transformation of mercury during coal combustion is restricted in chemical equilibrium calculations and experiments. A mathematic model is developed in this paper to predict the fate of mercury during coal combustion. The developed model based on numerical fluid dynamics(CFD) and the thermodynamic calculations. The model has a functionon considing the effects of the reactions between vapor mercury and other compositions in the flue gas, the condensation, coagulation of mercury, and the aerosol dynamics of the particles. Finally, the combustion process of pulverized coal in a single burner furnace was simulated. The predicted metal enrichments on bottom ash are well predicted.更多还原