核桃壳与煤共热解的热重分析及动力学研究  

Thermogravimetric Analysis and Kinetics of Walnut Shell and Coal Co-pyrolysis

作　　者：黄元波[1] 郑志锋[1] 蒋剑春[2] 戴伟娣[2] 孙云娟[2] 

机构地区：[1]西南林业大学西南山地森林资源保育与利用省部共建教育部重点实验室,材料工程学院,云南昆明650224 [2]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业局林产化学工程重点开放性实验室,江苏省生物质能源与材料重点实验室,江苏南京210042

出　　处：《林产化学与工业》2012年第2期30-36,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(30800867,31160147);教育部新世纪优秀人才计划资助项目(NCET-09-0906);中国博士后科学基金项目(20080430465)

摘　　要：利用热重分析在不同升温速率(5～50 K/min)和氮气气氛下对核桃壳、褐煤以及核桃壳-褐煤(质量比1∶1)混合物的热解失重行为进行了研究,求取了热解动力学参数。实验结果表明,随着升温速率的提高,3种原料的失重率下降,热失重速率升高;核桃壳与褐煤共热解时存在协同作用;三者的平衡热解温度分别为568.9、709.9和571.0K。应用Coats-Redfern方法进行热解动力学过程分析表明,3种原料均可由一级反应过程描述。核桃壳快速热解和残余物缓慢热解阶段的平均活化能分别为50.6、17.3 kJ/mol,褐煤的平均活化能为21.1 kJ/mol,核桃壳-褐煤混合物快速热解和残余物缓慢热解阶段的平均活化能分别为34.2和14.5 kJ/mol。The pyrolysis characteristics of walnut shell,coal and their blends sample at different heating rates（5-50 K/min） in a stream of N2 were studied using thermogravimetric analysis.The results showed that the pyrolysis speed increases with the heating rate for three samples increasing.It showed a good synergy during the co-pyrolysis of walnut shell and coal.The balance thermal decomposition temperature of walnut shell,coal and their blends was 568.9,709.9 and 571.0 K,respectively.With the method of Coasts-Redfern,the pyrolysis process could be described by first-order global model for both of fast-pyrolysis and slow decomposition stage.The average activation energy was 50.6 and 17.3 kJ/mol for both pyrolysis stages of walnut shell,respectively.It was 21.1 kJ/mol for pyrolysis of lignite.But it decreased to 34.2 kJ/mol and 14.5 kJ/mol for both pyrolysis stages of blends of walnut shell/coal,respectively.

关 键 词：核桃壳 褐煤 热解 热重分析 动力学 

分 类 号：TQ35[化学工程] TQ52