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.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
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)
关键词
核桃壳
褐煤
热解
热重分析
动力学
walnut shell
lignite
pyrolysis
thermogravimetric analysis
kinetics
