吸附剂与铅反应的热力学平衡分析  

THERMODYNAMIC EQUILIBRIUM ANALYSIS FOR REACTION BETWEEN SORBENTS AND LEAD

作　　者：张小锋[1] 姚强[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室热能工程系,北京100084

出　　处：《工程热物理学报》2006年第6期1054-1056,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划项目(No.2002CB211606)

摘　　要：本文采用热力学平衡分析的方法,对两种吸附剂CaO和SiO2控制燃煤中铅的排放进行了计算．计算使用软件CHEMKIN．结果表明CaO对铅的化学吸附效果很差,而SiO2对铅的化学吸附效果较好．对煤中含有的硫、氯对吸附剂性能的影响也进行了评价,硫和氯会抑制SiO2对铅的吸附效果,但在1200-1300 K对铅的化学吸附效率仍在75％以上．讨论了不同硅铅比对于化学吸附效率的影响,对于实际中选择恰当的硅铅比有指导意义。Thermodynamic equilibrium analysis was applied to calculate the reaction to control lead emissions from coal combustion using two sorbents： CaO and SiO2. The Gibbs free enengy of the system was minimized using CHEMKIN. The results show that CaO is not effective for the chemical adsorption of lead, but SiO2 is very effective for the capture of lead. The impact of sulfur and chlorine in the coal on the performance of sorbents has also been evaluated. Sulfur and chlorine is found to restrain lead capture by SiO2, but the chemical adsorption efficiency of lead by SiO2 remains above 75 percent between 1200 K and 1300 K. The influence of different silicon and lead ratio on chemical adsorption efficiency was discussed, and it is useful for the selection of optimal silicon and lead ratio in practice.

关 键 词：铅 颗粒物 吸附剂 热力学平衡 CHEMKIN 

分 类 号：TK16[动力工程及工程热物理—热能工程] O642[理学—物理化学]