石灰石分解反应动力学参数随温度变化特性研究  

Analysis of Variation Characteristics of Kinetics Parameters on Limestone Calcination Reaction in Different Temperature

作　　者：陈江涛[1] 陈鸿伟[1] 赵振虎[1] 危日光[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《电站系统工程》2012年第6期10-12,16,共4页Power System Engineering

基　　金：国家自然科学基金(50876030);中央高校基本科研业务费专项资金资助(11MG46)

摘　　要：石灰石煅烧反应动力学参数是分解炉工艺设计的重要依据。常规的动力学计算通常假定动力学参数不随温度变化,求出的是各温度下的平均值。为了得到动力学参数随温度的变化情况,对不同温度范围的煅烧特性进行了研究。结果表明:温度对煅烧分解特性有较大的影响,反应性指数随温度呈抛物线增长;石灰石在N2环境气氛的煅烧反应适宜用相边界反应(圆柱形对称)机理来描述,所求取的表观活化能和指前因子随温度呈不规则的变化规律,但活化能和指前因子的变化规律相似,存在补偿效应。根据补偿系数推导出石灰石的等动力学温度约为868℃。Kinetics parameters of limestone calcination were the important design basis for a calciner.Conventional kinetic calculation assuming that the kinetic parameters did not change with temperature was the average of the temperature range.In order to obtain the kinetic parameters varying with temperature,calcined characteristics of limestone in the different temperature range were investigated.The results indicate that temperature has a greater influence on the decomposition characteristics and the response index is parabolic growth with temperature.The phase boundary reaction（cylindrical symmetry） is suitable for limestone calcination under N2 atmosphere.The kinetic parameters vary irregularly with temperature,but there exists compensation effect between dynamic parameters.The isokinetic temperature is 868℃computed by compensation coefficients.

关 键 词：石灰石 等温热重法 反应动力学 补偿效应 等动力学温度 

分 类 号：TK16[动力工程及工程热物理—热能工程]