溴化物对燃煤烟气中汞的均相与非均相氧化动力学研究  

Kinetic Study of Homogeneous and Heterogeneous Mercury Oxidation by Bromine in Coal-Fired Flue Gas

作　　者：杨应举 赵利鹏[1] 刘晶[1] 沈锋华[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《工程热物理学报》2015年第9期2040-2044,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376072);国家重点基础研究发展规划项目(No.2014CB238904)

摘　　要：本文建立了溴化物对燃煤烟气中汞的均相与非均相氧化动力学模型,并模拟了烟气中不同HBr浓度、降温速率及未燃尽炭直径条件下汞的形态分布。结果表明多相模拟预测结果与实验数据吻合较好,敏感性分析显示溴对汞均相氧化的主要反应通道是Hg^0+Br_2(?)HgBr_2;溴对汞非均相氧化的主要反应通道是StBr(s)+Hg^0(?)StHgBr(s)。HBr浓度一定的条件下,随着未燃尽炭直径的减小,汞的氧化率增加。A kinetic model of homogeneous and heterogeneous mercury oxidation by bromine in coal-fired flue gas was developed to predict mercury speciation in flue gas. The condition of different HBr concentrations, quench rates and unburned carbon diameters were considered. The results show that the combined homogeneous-heterogeneous model predictions are in good agreement with the experimental data. Sensitivity analysis indicates that the dominant channels of homogeneous and heterogeneous mercury oxidation by bromine are Hg0＋Br2←→HgBr2 and StBr（s）＋Hg→StHgBr（s）, respectively. The predicted extent of mercury oxidation increases with decreasing the diameter of unburned carbon.

关 键 词：汞 溴化物 未燃尽炭 非均相氧化 燃煤烟气 

分 类 号：TK16[动力工程及工程热物理—热能工程]