杨木刨花板的热解动力学分析.pdfVIP

杨木刨花板的热解动力学分析 * 黄志义,冯永顺,于志明 ,母 军 (北京林业大学材料科学与技术学院, 北京 100083) 摘摇 要:摇 采用热重分析仪对杨木刨花板进行热解,结合Coats-Redfern 法分析热重曲线,探讨了反 应机理。 结果表明:杨木刨花板的热解过程分为失水干燥、快速热解和慢速热解3 个阶段;升温速 率的提高使热解最大失重速率增大,热解的各个阶段向高温方向横向偏移。 快速热解阶段的反应 HUANGZhi鄄yi摇 摇 机理满足D 模型,热解的活化能(E)107.24 kJ/ mol;5、10和20 益/ min 3种速率下的指前因子(A) 3 5 5 5 -1 值分别为2.09伊10 、6.57伊10 和3.22伊10 s 。 关键词:摇 杨木刨花板;热解;动力学;反应机理 中图分类号:TQ35摇 摇 摇 摇 摇 摇 文献标识码:A摇 摇 摇 摇 摇 摇 文章编号:0253-2417(2012)05-0083-05 Kinetic Mechanism of Pyrolysis Reaction Using Poplar Particleboards as Raw Material HUANGZhi鄄yi,FENG Yong鄄shun,YU Zhi鄄ming,MUJun (College of Materials Science and Technology,Beijing Forestry University,Beijing 100083,China) Abstract:The pyrolysis reactions of poplar particleboards were carried out using the thermogravimetric apparatus,The TG and DTG curveswere used to analysis the pyrolysis mechanism by Coats鄄Redfern method. The results show that the non鄄isothermal pyrolysis of poplar particleboardscanbegenerally dividedintothreestages:dehydration,fastpyrolysisandslowpyrolysis. Asthe heating rate increased,themaximumrateofweightlosswerealsoincreased. ItwasfoundthattherewasalateralshiftintheTGA curves to higher temperatures. The fast pyrolysis stage can be described by the model of D3. The activation energy is 5 5 5 -1 107.24kJ/ mol,and the pre鄄exponpential factors of5,10 and20 益/ min are2.09伊10 s,6.57伊10 ,3.22伊10 s ,respec鄄 tively. Key words:poplar particleboards;pyrolysis;kinetics;pyrolytic mechanism 每年有大量的人造板及其制品被淘汰,废弃人造板的数量与日俱增。 废弃人造板多有一定的甲醛