空气气氛下PbCl_2高温挥发的热力学和动力学分析  

Kinetic and thermodynamic study of PbCl_2 volatilizing in air atmosphere

作　　者：李彦龙[1] 李润东[1] 王雷[1] 张海军[1] 可欣[1] 魏砾宏[1] 

机构地区：[1]沈阳航空工业学院清洁能源与环境工程研究所及辽宁省清洁能源重点实验室,辽宁沈阳110136

出　　处：《热科学与技术》2009年第1期57-63,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(50606028);2007年教育部新世纪优秀人才支持计划项目

摘　　要：针对我国垃圾焚烧飞灰高氯含量的特点,以PbCl2为研究对象,首先利用热力学Gibbs自由能判据理论对空气气氛下PbCl2高温挥发反应的主要反应和热力学平衡进行分析,然后利用高温热重差热分析仪(TG-DTA)研究升温速率(10、15、20℃/min)对其影响,并结合热力学分析建立PbCl2高温挥发的本征动力学模型。热力学分析表明:PbCl2的高温挥发主要是PbCl2离子晶体的相变过程,PbO和Pb的生成量很小;实验结果表明:随着升温速率的升高,挥发反应TG曲线向高温方向移动,挥发反应的各特征温度都有所升高;动力学分析表明:零级反应动力学可以很好地描述PbCl2的高温挥发反应。As for the high chlorine content of MSWI fly ash in China, the volatilization of chlorides of lead （Pb） was studied. Firstly the volatilization under air atmosphere of lead chloride（PbCl2） was modeled by Gibbs free energy criterion. Subsequently, the heating rate, that influenced the volatilization of PbCl2 was characterized on basis of experimental observations derived by means of a high temperature TG-DTA system. With the results of the thermodynamic analysis, the kinetic models of the volatilization of PbCl2 were also developed. The results show that the volatilization process of PbCl2 is mainly the phase change of PbCl2 crystal with a small quantity of lead oxide（PhO） and lead created; the volatilization curves shift with increasing heating rate towards higher temperatures, and the temperature eigenvalue increase on certain degree with increasing heating rate, but the volatilization ratio changes indistinctively; a zero-order kinetic model may describe the volatilization reaction accurately.

关 键 词：PbCl2 挥发 热力学 相变 动力学 

分 类 号：TK16[动力工程及工程热物理—热能工程]