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亚麻纤维是一种潜在的气化原料,本文对亚麻纤维的热解行为进行了热重分析研究。10mg粒径为0.60~0.85mm的亚麻纤维颗粒在高纯氮气的保护下分别以10、20、30、50K.min-1的升温速率线性升温到550℃。使用“model free”方法和Coats-Redfern模型拟合方法分析亚麻纤维的热解过程,并估算出热解反应的表观活化能。本文中“model free”方法包括Friedman、Flynn-wall-Ozawa、Vyazovkin and Wight三种等转化率方法及Kissinger法。三种等转化率方法均得到活化能随着转化率的升高而升高的规律。四种“model free”方法显示亚麻纤维的活化能主要在155~175kJ·mol-1之间,使用模型拟合方法所获得亚麻纤维热解反应的活化能值在175kJ·mol-1左右,使用模型拟合方法和“model free”方法所得的活化能值接近。这些活化能值可以为亚麻纤维高效的热化学利用提供基础数据。
Flax fiber is a potential gasification raw material. In this paper, the thermogravimetric analysis of flax fiber pyrolysis behavior was carried out. 10mg flax fiber particles with particle size of 0.60 ~ 0.85mm under the protection of high purity nitrogen were heated to 550 ℃ linearly at a heating rate of 10, 20, 30, 50K.min-1 respectively. The pyrolysis of flax fibers was analyzed using the “model free” method and the Coats-Redfern model fitting method, and the apparent activation energy of the pyrolysis reaction was estimated. The “model free” method in this paper includes the three methods of conversion and Kissinger, such as Friedman, Flynn-wall-Ozawa, Vyazovkin and Wight. Three kinds of conversion methods such as the rate of activation have been obtained as the conversion rate increases. Four “model free” methods showed that the activation energy of flax fiber was mainly between 155 ~ 175kJ · mol-1, and the activation energy of flax fiber obtained by model fitting method was about 175kJ · mol-1 , The values of activation energy obtained using the model fitting method and the “model free” method are close. These activation energy values provide basic data for efficient thermochemical utilization of flax fibers.