空气气氛下木材表观热解动力学

摘要

研究了空气气氛下马尾松和楠木的树叶、树皮和树干试样的热解过程,发现每种试样的热解均包含两步主要的失重过程,在600℃时总失重均达90%以上.利用积分方法建立了适用于所有试样的两阶段一级动力学模型,实验失重曲线较好地符合模型计算出的失重曲线.%The thermal decomposition of the leaf, bark and wood of masson pine ( Pinus massoniana ) and nanmao (Michelia macclurei) have been studied by using dynamic thermogravimetry under air atmospheric conditions. It is found that in all cases two main weight loss proc esses took place and the total weight loss at 600℃was over 90%. By means of the integral method, the weight loss curves obtained for all cases are all best described by a two-stage first order kinetic model, which is justified by the reconstruction of the thermal analysis data. The thermal stability of the leaf, bark, and wood for each material is estimated and discussed, and it is found that wood has the lowest thermostability.