【摘要】 生物质是一种重要的可再生能源,热解是生物质热转化利用技术的重要方法之一。采用TA-Q500型热重分析仪对松木在10℃/min,15℃/min,20℃/min,25℃/min四个升温速率下的松木热解特性进行实验研究。研究表明其整体反应温度区间为200～400℃。当升温速率从10℃/min增大到25℃/min后,最大反应速率明显增大,最大反应速率对应的温度提高了14℃,产生了热延迟现象,并且热解特征指数增大了3倍左右。利用Kissinger-Akahira-Sunoes (KAS)方法对热解活化能进行无模型拟合计算,松木热解活化能的平均值为216. 58 kJ/mol。根据所求的活化能值,通过Criado主曲线法对松木热解反应的机理函数进行拟合,松木热解机理主要由随机成核和随后生长模型来控制,在高转化率阶段则转为三阶反应控制。更多还原

【Abstract】 Biomass is an important renewable energy source and pyrolysis is an important method adopted in biomass thermal conversion utilization technology. This paper adopted TA-Q500 thermogravimetric analyzer to study the pyrolysis characteristics of pine wood at four heating rates of 10 ℃/min,15 ℃/min,20 ℃/min and 25 ℃/min. The results showed that the overall reaction temperature range is between 200 ～ 400 ℃ . When the heating rate increased from 10℃/min to 25 ℃/min,the maximum reaction rate increased significantly. Besides,the temperature corresponding to the maximum reaction rate increased by 14 ℃,resulting in the phenomenon of thermal delay. Moreover,the pyrolysis characteristic index also increased by about 3 times. Kissinger-Akahira-Sunoes( KAS) was applied to conduct a model free calculation on the pyrolysis activation energy of pine wood,which was 216. 58 kJ/mol in average resulting from calculation. According to the calculated activation energy value,the mechanism function of pine pyrolysis reaction was fitted by Criado master plots method. The fitting revealed that the pyrolysis mechanism of pine is mainly controlled by random nucleation and nuclei growth,and it is transferred to the regime controlled by the third order mechanism at high conversion rate stage.更多还原