基于热重法的准东煤等转化率热解动力学模型  

A kinetic model based on TGA data for pyrolysis of Zhundong coal

作　　者：江国栋[1] 魏利平[1] 滕海鹏[1] 郝惠娣[1] JIANG Guodong WEI Liping TENG Haipeng HAO Huidi(College of Chemical Engineering, Northwest University, Chemical Engineering Research Center of Ministry of Education for Advanced Use Technology of Shanbei Energy, Xi＇an 710069, Shaanxi, China)

机构地区：[1]西北大学化工学院,陕北能源先进化工利用技术教育部工程研究中心,陕西西安710069

出　　处：《化工学报》2017年第4期1415-1422,共8页CIESC Journal

基　　金：国家自然科学基金项目(51606153);陕西省自然科学基础研究计划项目(2016JQ5101)~~

摘　　要：准东煤热解脱挥发分特性对其热加工利用过程具有重要影响,建立准东煤热解通用动力学模型对预测挥发分产率及反应性能具有重要意义。采用热重测量了不同升温速率条件下的准东煤脱挥发分失重特性,使用Friedman、Flynn-Wall-Ozawa(FWO)和Kissinger-Akahira-Sunose(KAS)3种等转化率模型来处理热重实验数据,仔细分析了不同模型参数的获得方法及不同模型中活化能及指前因子的差异。研究结果表明,准东煤活化能分布函数呈现单峰分布;相比其他模型,FWO模型能够较好地描述准东煤的热解过程。In order to predict the yield of volatiles and reaction performance during pyrolysis of Zhundong coal, which is of significant importance for its thermal processing, a kinetic model is necessary. The devolatilization of Zhundong coal is characterized by thermo-gravimetric analysis（TGA） at different heating rates. Three types of iso-conversion kinetic models, i.e., Friedman, Flynn-Wall-Ozawa（FWO） and Kissinger-Akahira-Sunose（KAS）, are employed to fit TGA data for pyrolysis of Zhundong coal. The pre-exponential factors and activation energies obtained from different kinetic models are analyzed. The results show that there exists unimodal distribution for the activation energies and the FWO model is better for description of pyrolysis process of Zhundong coal.

关 键 词：煤 热解 热重分析 等转化率 动力学 模型 

分 类 号：TQ530.2[化学工程—煤化学工程]