燃煤烟气中汞均相氧化的数值模拟  

Numerical modeling of mercury homogeneous oxidation in coal-fired flue gas

作　　者：陶叶[1] 禚玉群[1] 刘晶[2] 陈昌和[1] 徐旭常[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《化工学报》2011年第1期186-191,共6页CIESC Journal

基　　金：国家自然科学基金项目(50876052;20877030);国家重点基础研究发展计划项目(2006CB200300)~~

摘　　要：利用小型固定床反应器系统进行了烟气成分与汞的相互作用实验研究,温度范围为200～800℃。建立了汞的均相反应模型,并运用CHEMKIN软件模拟了各种温度和HCl浓度下汞的氧化份额。结果表明,模型预测结果与实验数据吻合效果很好;汞的最佳氧化温度范围为(250±10)℃。取样过程会对汞的存在形式产生影响,特别是经过快速降温后的恒温流动中,汞的氧化速率显著提高。Experimental research was conducted in a fixed-bed reactor system to determine the interactions of flue gas species and mercury in the temperature range of 200℃ to 800℃.Mercury homogeneous reaction mechanism were summarized and used to develop numerical modeling.The experimental results could be satisfactorily simulated by using CHEMKIN software.Combining the data from experimental and numerical study,the temperature for the highest mercury oxidation rate was determined at （250±10）℃. The influence of sampling process was also investigated.Mercury speciation was found to change significantly to a higher rate of oxidation during sampling,especially when maintained at a lower temperature after fast quenching of flue gas.

关 键 词：汞 氧化 反应机理 燃煤烟气 取样 

分 类 号：TK16[动力工程及工程热物理—热能工程]