红松热解特性及动力学实验研究

Experimental study on pyrolysis characteristics and kinetics of Pinus koraiensis

采用热重分析法对红松的树皮、树干、松针和松果在空气气氛下进行热解实验,升温速率20℃/min,从20℃加热至800℃,并对热解过程进行动力学分析。结果表明:试样的热解过程分为失水、微失重、主要失重和炭化4个阶段,热稳定性大小排序为:松果>树皮>树干>松针。升温速率越高,失重速率越快,但升温速率过快使试样内部受热不均,产生热滞后现象。升温速率为10℃/min时热解失重率最高,热解反应最充分。Coats-Redfern法和Broido法较适用于红松热解动力学计算。试样活化能大小排序为:松果>树皮>树干>松针。

The thermos gravimetric method was used to carry out the pyrolysis experiments of bark,trunk,pine needle and pine cone of Pinus koraiensisi in air atmosphere.The samples were heated from 20℃to 800℃with heating rate of 20℃/min,and the kinetic analysis of pyrolysis process was carried out.Experimental results showed that the pyrolysis process of Pinus koraiensisi included the dehydration stage,the slight weight reduction stage,the main weight reduction stage and the carbonization stage.Thermal stability was ranked as follows:pine cone>bark>trunk>pine needle.The higher the heating rate,the faster the mass loss rate.If the heating rate is too fast,the inside of the sample will be unevenly heated,resulting in thermal hysteresis.When the heating rate is 10℃/min,the sample has the highest weight loss rate,and the most sufficient pyrolysis reaction.The Coats-Redfern method and the Broido method are more suitable for the calculation of the pyrolysis kinetics of Pinus koraiensisi.Activation energy was ranked as follows:pine cone>bark>trunk>pine needle.