内蒙古毕拉河林区地表死可燃物热解特性

Pyrolysis characteristics of ground dead combustibles in the Bilahe forest area in Inner Mongolia

以兴安落叶松-白桦混交林等5种森林枯落物层类为研究对象,运用热重分析法,通过TG-DTG曲线分析样品的热解过程,利用Coats-Redfern积分法对样品的快速热解阶段进行动力学分析,通过着火温度、活化能E与热解特性指数P的综合分析,评价各可燃物样品的燃烧特性。结果表明:264~411℃是快速热解阶段,也是热失重的主要阶段,失重量达初始失重量的82.26%以上。其中兴安落叶松林活化能E相对较高,热稳定性相对较强,兴安落叶松-白桦混交林热解特性指数P相对较低,热解行为相对较难。可以营造兴安落叶松-白桦混交林,作为防火树种并建立防火隔离带,能够降低林分燃烧特性,减小森林火灾发生的可能性。

Taking five forest types such as Xing'an larch birch mixed forest as the main research object,the pyrolysis process of the sample was analyzed by TG-DTG curve by thermogravimetric analysis,the kinetic analysis of the rapid pyrolysis stage of the sample was carried out by Coats-Redfern integral method,and the comprehensive analysis of ignition temperature,activation energy E and pyrolysis characteristic index P was carried out,in order to evaluate the fire resistance of each combustible sample.The results show that 264~411℃is the rapid pyrolysis stage and the main stage of thermal weight loss,and the weight loss reaches more than 82.26%of the initial weight loss.Among them,the activation energy E of Xing'an larch forest is relatively high,the thermal stability is relatively strong,the pyrolysis characteristic index P of Xing'an larch birch mixed forest is relatively low,and the pyrolysis behavior is relatively difficult.Building Xing'an larch birch mixed forest as a fire prevention tree species and establishing a fire isolation zone can reduce the combustibility of the forest and reduce the possibility of forest fire.