生物质化学工程2024，Vol.58Issue(4)：15-22,8.DOI:10.3969/j.issn.1673-5854.2024.04.003
麻栎木热解过程的热质变化行为及其动力学
Heat and Mass Change Behavior and Kinetics of Quercus acutissima Wood Pyrolysis
摘要
Abstract
In order to well know the pyrolysis characteristics of Quercus acutissima wood,the weightlessness mechanism and thermal behavior of pyrolysis process were analyzed by thermogravimetric analysis,the apparent activation energy of pyrolysis process was calculated through Flynn-Wall-Ozawa(FWO)model and Kissinger-Akahira-Sunose(KAS)model,and the most probable mechanism function was obtained based on Malek method.The results show that the pyrolysis processes can be divided into four stages:dry,preheating,volatile fraction removal and carbonization.The weight loss in the volatile fraction removal stage accounts for 71.24％of the weight loss of total pyrolysis process.The pyrolysis process of quercus acutissima includes both endothermic and exothermic reactions.With the increase of heat rate,TG curves and DTG curves move towards high temperature.The apparent activation energies obtained by FWO model and that of KAS model range from 226.79-258.17 kJ/mol and 229.22-260.8 kJ/mol,respectively,while the trend of the apparent activation energies from above two models are similar.Coefficients of determination are above 0.94.The result from the Malek method shows that the three-dimensional diffusion model(Jander equation)is dominant when the conversion is lower than 0.5,and nuclei formation model(Avrami-Erofeev equation,n=3/2)is dominant when the conversion is higher than 0.5.关键词
麻栎木/失重行为/热行为/最概然机理函数Key words
quercus acutissima wood/weightlessness behavior/thermal behavior/most probable mechanism function分类
化学化工引用本文复制引用
周泽峰,李晓航,石焱..麻栎木热解过程的热质变化行为及其动力学[J].生物质化学工程,2024,58(4):15-22,8.基金项目
中国林业科学研究院生态保护与修复研究所基本科研业务费资助项目(CAFYBB2020SZ009) （CAFYBB2020SZ009）
