热重-红外联用技术分析桉树热解动力学及挥发产物对结渣影响研究

INFLUENCE STUDY OF PYROLYSIS KINETICS AND VOLATILE PRODUCT CHARACTERISTICS OF EUCALYPTUS ON SLAGGING BASED ON TG-DTG-FTIR TECHNIQUE

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（Tin）、终止热解温度（Th）和最大峰值温度（Tmax）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33．25～60．12kJ／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。

Abstract： The kinetic activation energy E of eucalyptus and absorption bands and characteristic peaks of its volatile product under the heating rate 10, 30, 60 %/min were researched based on TG-DTG-FTIR coupled technique. The experimental results show that eucalyptus pyrolysis process can be divided into three stages： moisture volatilizing stage （0-265 ℃）, volatility separating out stage （265-605 ℃ ） and carbonization stage （605-700 ℃ ）. And with the increase of the heating rate, the maximum pyrolysis rate increases, all the initial temperature of pyrolysis （Tin）, the termination temperature of pyrolysis （Th） and the maximum peak temperature （Tmax） of the pyrolysis curves slightly move to the high temperature side. The Flynn-Wall-Ozawa integral method can be used to calculate pyrolysis kinetic activation energy E value of eucalyptus under the conversion rate α∈ [0.2,0.8 ] when the reaction mechanism function is unknown, which is between 33.25 and 60.12 kJ/mol and is close to the activation energy E value calculated from Coats-Redfern method. The product in different pyrolysis stage is analyzed by using the FTIR spectra, and at same time, the corresponding TG-DTG curve is verified.