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基于热重-红外联用技术(TG-DTG-FTIR),研究升温速率为10、30、60℃/min下桉树的热解动力学活化能E及挥发分产物吸收带和特征峰。实验结果表明:桉树热解过程可分为水分挥发阶段(0~265℃)、挥发分析出阶段(265~605℃)、炭化阶段(605~700℃),共3个阶段,并且随着升温速率的增大热解最大速率增大,起始热解温度(T_(in))、终止热解温度(T_h)和最大峰值温度(T_(max))的热解曲线均向高温处稍微移动。在不知反应机理函数的情况下,利用Flynn-Wall-Ozawa法在转化率α∈[0.2,0.8]下计算桉树的热解动力学活化能E值,结果在33.25~60.12 k J/mol之间,与Coats-Redfern法求解的结果相近。利用FTIR谱图分析各热解阶段的产物,同时验证与之相应的TG-DTG曲线。
Based on the TG-DTG-FTIR method, the kinetic activation energy E and the absorption bands and characteristic peaks of volatile compounds in Eucalyptus at 10, 30 and 60 ℃ / min heating rates were studied. The experimental results show that the eucalyptus pyrolysis process can be divided into three stages: water evaporation stage (0 ~ 265 ℃), volatilization stage (265 ~ 605 ℃), carbonization stage (605 ~ 700 ℃) The maximum rate of pyrolysis increases, and the pyrolysis curves of the initial pyrolysis temperature (T_ (in)), the final pyrolysis temperature (T_h) and the maximum peak temperature (T_ (max) . Without knowing the mechanism of reaction mechanism, the E-value of pyrolysis kinetic energy of Eucalyptus was calculated by Flynn-Wall-Ozawa method under the conversion rate α ∈ [0.2,0.8], and the result was between 33.25 and 60.12 kJ / mol , Which is similar to Coats-Redfern method. The product of each pyrolysis stage was analyzed by FTIR spectroscopy, and the corresponding TG-DTG curve was also verified.