景区典型树种的热解特性及动力学研究

为了研究山林或景区中不同植物的热稳定性，选取了景区种植数量较多的6种典型树种:女贞、枇杷、竹子、松树、柏树和法桐的枝干和叶作为样品。借助同步热分析仪，在温升速率20℃/min的条件下，对未经干燥处理的样品进行热解特性及热解反应动力学研究。通过TG、DTG以及DSC曲线分析各样品的热解过程，并采用分阶段一级反应动力学模型Coats-Redfern法求得相应参数。研究结果表明:所取样品的热解过程都出现4个明显的热解阶段，即脱水阶段、综纤维素热解阶段、木质素热分解阶段、炭化阶段。根据6个树种的主要热解阶段和动力学分析，6种树种的热稳定性从低到高顺序依次为竹子、女贞、枇杷、法桐、柏树、松树。

Study on pyrolysis characteristics and kinetics of typical tree species in scenic spots

In order to study the thermal stability of different plants in the mountain forests or scenic spots, six typical tree species with a large number of planting in the scenic spots were selected, including ligustrum lucidum, loquat, bamboo, pine, cypress and platanus orientalis, and their branches and leaves were taken as the samples. The pyrolysis characteristics and pyrolysis reaction kinetics of the undried samples were studied under the condition of temperature rising rate of 20℃/min by using the synchronous thermal analyzer. The pyrolysis process of each sample was analyzed by TG, DTG and DSC curves, and the corresponding parameters were obtained by using the divided stage first order reaction kinetics model Coats Redfern method. The results showed that there were four distinct pyrolysis stages in the pyrolysis process of all the samples, namely the dehydration stage, pyrolysis stage of holocellulose, thermal decomposition stage of lignin and carbonization stage. According to the main pyrolysis stages and kinetic analysis of six tree species, the order of their thermal stability from low to high was bamboo, ligustrum lucidum, loquat, platanus orientalis, cypress and pine.