摘要
针对我国垃圾焚烧飞灰高氯含量的特点,以ZnCl2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ZnCl2的高温挥发过程进行理论预测,然后利用高温热重差热分析仪(TG-DTA)研究升温速率(10℃/min、15.℃/min、20.℃/min)对其的影响,并结合热力学分析建立ZnCl2高温挥发的本征动力学模型.热力学分析表明,ZnCl2的高温挥发主要是ZnCl2离子晶体的相变过程和向ZnO的转变过程;随着升温速率的增大,挥发反应TG曲线向高温方向移动,挥发反应的各特征温度和挥发率都有所升高.动力学分析表明,零级反应动力学可以很好地描述ZnCl2的高温挥发反应.
Aimed at high content of chlorine in MSWI fly ash in China, volatilization of chlorides of zinc （Zn）was studied. Firstly volatilization of zinc chloride （ZnCl2） under air atmosphere was modeled employing Gibbs free energy criterion, then, heating rate influencing ZnCl2 volatilization was studied on the basis of experimental observations by means of a high temperature TG-DTA system. Based on thermodynamic analysis, this paper worked out kinetic models of the volatilization of ZnCl2. The results show that the volatilization process of ZnCl2 is mainly the process of phase change of ZnCl2 crystal and that of considerable creation of zinc oxide （ZnO）. As heating rate increases, volatilization curves move forwards higher temperatures, and both volatilization ratio and temperature eigenvalue increase to some degree. A zeroorder kinetic model can be used to describe volatilization reaction accurately.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2010年第1期30-34,共5页
Journal of Combustion 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资助项目
关键词
ZNCL2
挥发
热力学
相变
零级动力学
ZnCl2
volatilization
thermodynamics
phase change
zero-order kinetic
