烟气中Hg的氧化机理的研究

STUDY OF MERCURY OXIDATION IN POST-FLAME GAS

本文对Ｈｇ与Ｃｌ２在烟气中的氧化反应进行了热力平衡计算和动力学计算。平衡计算的结果表明有ＣＩ元索存在时Ｈｇ的氧化率为１００％，而在相同的条件下动力学计算纺果为Ｈｇ的氧化率在２０％～８０％之间变化，与实验结果吻合。实际的氧化反应是一种超平衡状态，不能达到理想的平衡状态。因此应采用动力学与热力平衡分析相结合的方法研究Ｈｇ在烟气中的反应机理。同时，计算结果显示Ｃｌ含量对Ｈｇ的氧化率的影响很大．

L: Mercury oxidation by chlorine is calculated with both thermal equilibrium analysis and chemical kinetics. The results of kinetic calculation show that the extent of mercury oxidation is 20-80%, which is consistent with the experimental data, while the extent of Hg oxidation is 100% by thermal equilibrium calculation under the same condition. It is found that combination of kinetic calculation and equilibrium analysis is preferred in the study of mercury oxidation in post-flame flue gas. Meanwhile, the calculation results also indicate a remarkable effect of Cl content on Hg oxidation rate.