Oxidation of Mercury across Selective Catalytic Reduction Catalysts in Coal–Fired Power Plants
Oxidation of Mercury across Selective Catalytic Reduction Catalysts in Coal–Fired Power Plants
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DOI：
10.1080/10473289.2006.10464437
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发表时间：
2006-01
影响因子：
2.7
通讯作者：
C. Senior
中科院分区：
文献类型：
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作者：
C. Senior
摘要建立了燃煤电厂选择性催化还原（SCR）系统中汞（Hg）氧化量的动力学模型，并进行了试验。该模型纳入了多孔SCR催化剂内的扩散和氨和汞之间的催化剂上的活性位点的竞争的影响。模拟烟气中汞氧化的实验室数据和电厂烟气中汞氧化的滑流数据进行了建模。该模型在280-420 °C的温度范围内提供了对八种不同催化剂（板和整体）的数据的良好拟合，空速从1900至5000 hr-1变化。空速，温度，盐酸含量的烟道气，氨与一氧化氮的比率，和催化剂设计都影响汞氧化的SCR催化剂。该模型可用于预测煤的性质，催化剂的设计，和操作条件对汞氧化跨SCR的影响。
Abstract A kinetic model for predicting the amount of mercury (Hg) oxidation across selective catalytic reduction (SCR) systems in coal–fired power plants was developed and tested. The model incorporated the effects of diffusion within the porous SCR catalyst and the competition between ammonia and Hg for active sites on the catalyst. Laboratory data on Hg oxidation in simulated flue gas and slipstream data on Hg oxidation in flue gas from power plants were modeled. The model provided good fits to the data for eight different catalysts, both plate and monolith, across a temperature range of 280–420 °C, with space velocities varying from 1900 to 5000 hr–1. Space velocity, temperature, hydrochloric acid content of the flue gas, ratio of ammonia to nitric oxide, and catalyst design all affected Hg oxidation across the SCR catalyst. The model can be used to predict the impact of coal properties, catalyst design, and operating conditions on Hg oxidation across SCRs.