本文建立了燃煤烟气冷却过程中汞氧化的均相反应动力学模型,使用化学动力学软件Chemkin4.0.1,通过理论计算考察各种影响汞均相氧化的因素,并对实验电厂的烟气汞氧化过程进行模拟,与实验结果进行对比.模型显示600 K左右为典型燃煤烟气氧化速率最快的温度区间;煤中氯含量近线性增加汞的氧化;烟气中汞的氧化受到动力学控制,因而低的烟气降温速率有利于汞的氧化.对电厂烟气的模拟显示,600 K左右的空气预热器是汞氧化速率最快的区域;而在400 K左右的除尘器中因停留时间长,汞也得到了明显的氧化.均相化学反应动力学模型对电厂汞排放模拟的结果与实验显示了一定的吻合,但模型对大部分电厂汞的氧化预测结果均比实验值偏高,需要进一步完善.
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