摘要
综合运用多重扫描速率法Popescu法、FWO法和KAS法对煤矸石失重过程的反应机理函数、活化能和指前因子进行了计算与分析.结果表明,煤矸石绝热氧化失重过程中不同失重阶段的反应机理不尽相同.煤矸石外在水分失水和固定碳燃烧失重阶段的反应机理为相边界反应的收缩圆柱体(面积)模型,而煤矸石内在水分失水和挥发分燃烧失重阶段的反应机理则分别为三维扩散模型和相边界反应的收缩球体(体积)模型.外在水分失水、内在水分失水、挥发分燃烧和固定碳燃烧4个失重阶段的活化能和指前因子的自然对数值分别为40.089 k J·mol-1和13.17 s-1,80.326 k J·mol-1和24.49 s-1,133.059 k J·mol-1和18.09 s-1,222.018k J·mol-1和23.68 s-1.
In order to make clear the dynamical parameters of the different zero-g period of adiabatic oxidation processes of coal gangue which can be divided up into the zero-g period of surface moisture,inherent moisture,volatile combustion and fixed carbon combustion,thermo-gravimetric experiments of coal gangue under the different heating rate conditions were analyzed by STA technology.Then the mechanism function,the activation energy and the pre-exponential factor were comprehensively calculated and analyzed by the multiple scan rate method such as Popescu method,FWO method and KAS method.The result shows that the reaction mechanism of the different zero-g periods of adiabatic oxidation processes of coal gangue is not the same.The reaction mechanism of the zero-g period of the surface moisture and fixed carbon combustion of coal gangue are both the contraction cylinder （area） model of phase boundary reaction,but the reaction mechanism of the zero-g period of the inherent moisture and volatile combustion of coal gangue are respectively the three dimensional diffusion model and the sphere （volume） model of phase boundary reaction.The activation energy and the natural logarithm of the pre-exponential factor of the zero-g period of surface moisture are respectively 40.089 kJ · mol-1 and 13.17 s-1.The activation energy and the natural logarithm of the pre-exponential factor of the zero-g period of inherent moisture are respectively 80.326 kJ · mol-1 and 24.49 s-1.The activation energy and the natural logarithm of the pre-exponential factor of the zero-g period of a volatile combustion are respectively 133.059 kJ · mol-1 and 18.09 s-1.The activation energy and the natural logarithm of the pre-exponential factor of the zero-g period of a fixed carbon combustion are respectively 222.018 kJ · mol-1 and 23.68 s-1.
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2014年第6期738-744,共7页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(U1361205
51304069)
河南省基础与前沿技术研究计划项目(082300463205
132300410121)
关键词
煤矸石
失重阶段
多重扫描速率法
反应机理函数
动力学参数
coal gangue
zero-g period
multiple scan rate method
reaction mechanism function
dynamical parameter
