摘要
【目的】热重分析是评价森林可燃物热解特性的重要方法。热重分析的结果能够用于计算热解动力学方程和其他热解参数,这是评价可燃物燃烧性的数据基础。根据热解动力学方程参数和其他热解参数的主成分分析结果对延边州地区7种常见乔木树种燃烧性进行排序,为延边州地区的防火树种选择提供理论支撑和指导。【方法】以延边州地区7种常见乔木树种的树皮、树叶为研究对象,利用热重分析仪器得到TG-DTG曲线并计算热解动力学方程求得7种乔木树种树皮及树叶的活化能(E)和指前因子(A),根据综纤维素热解阶段的活化能(E)以及主成分分析中的得分对7种乔木树种进行燃烧性排序。【结果】7种乔木树种的综纤维素热解阶段的活化能范围为:树皮:21.93~35.83 kJ·mol-1;树叶:25.76~46.10 kJ·mol-1,7种乔木树种树皮和树叶之间、不同热解阶段之间的指前因子变化很大;主成分分析法得到7种乔木树种的燃烧性排序:树皮:榆树皮>椴树皮>红松皮>长白落叶松皮>蒙古栎皮>刺槐皮>白桦皮。树叶:白桦叶>红松叶>榆树叶>长白落叶松叶>刺槐叶>椴树叶>蒙古栎叶。活化能排序与主成分分析法排序大致相反。【结论】根据热解参数的主成分分析结果对7种树种燃烧性排序,表明蒙古栎、刺槐和长白落叶松是延边州地区较好的抗火树种,可以作为较好的防火树种进行选择。
【Objective】Thermogravimetric analysis is an important method for evaluating the pyrolytic properties of forest fuels.The results of the thermogravimetric analysis can be used to calculate pyrolysis kinetic equations and other pyrolysis parameters,which are the data basis for evaluating the flammability of forest fuels.According to the pyrolysis kinetics equation and principal component analysis method,the flammability of 7 tree species in Yanbian area was sorted,providing theoretical support and guidance for the selection of fire-resistant tree species.【Methods】Taking the barks and leaves of 7 tree species in Yanbian area as test objects,using thermogravimetric analysis instruments to obtain TG-DTG curve and calculating the pyrolysis kinetics equation to obtain the activation energy(E)and pre-exponential factor(A)of 7 tree species.According to the activation energy(E)of the holocellulose pyrolysis stage and the score in principal component analysis,the flammability of 7 tree species was carried out.【Results】The activation energies ranged from 21.93 to 35.83 kJ·mol-1 in barks to 25.76 to 46.10 kJ·mol-1 in leaves.The pre-exponential factors between barks and leaves and between different pyrolytic stages of 7 tree species vary greatly.Principal component analysis was used to rank the flammability of 7 tree species:Barks:Ulmus pumila>Tilia tuan>Pinus koraiensis>Larix olgensis>Quercus mongolica>Robinia pseudoacacia>Betula platyphylla.Leaves:Betula platyphylla>Pinus koraiensis>Ulmus pumila>Larix olgensis>Robinia pseudoacacia>Tilia tuan>Quercus mongolica.The order of activation energy was roughly opposite to that of principal component analysis.【Conclusion】The results of principal component analysis of the pyrolysis parameters ranked the combustibility of 7 tree species,indicating that Quercus mongolica,Robinia pseudoacacia and Larix gmelinii were the better fire-resistant tree species in Yanbian area,and can be selected as better fire-resistant tree species.
作者
胡海清
高健
胡同欣
HU Haiqing;GAO Jian;HU Tongxin(College of Forestry,Northeast Forestry University,Harbin 150040,Heilongjiang,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2020年第11期1-10,共10页
Journal of Central South University of Forestry & Technology
基金
国家重点研发计划战略性国际科技创新合作重点专项(2018YFE0207800)
中央高校基本科研业务费专项资金项目(2572019CP10)。
关键词
热重分析
可燃物
燃烧性
热解动力学
主成分分析
thermogravimetric analysis
combustibles
combustibility
pyrolysis kinetics
principal component analysis
