古建筑木材的热稳定性及热解动力学研究  

Study on the thermal stability and degradation kinetics of the woods from an ancient building

作　　者：张翔[1] 覃文清[1] 李风[1] 

机构地区：[1]公安部四川消防研究所,四川都江堰611830

出　　处：《消防科学与技术》2008年第9期636-639,647,共5页Fire Science and Technology

基　　金：科研院所社会公益研究专项(2005DIA2J007)

摘　　要：采用热重分析(Thermogravimetric analysis,TGA)的方法研究了布达拉宫古建筑群中三种常用木材(红松、铁杉和云杉)在空气和氮气中的热解特性,采用Kissinger法计算了三种木材中木质素的降解活化能。结果表明,三种木材在空气中热解均包括木材中水分脱出过程、半纤维素、纤维素和木质素热解过程以及残炭的氧化三个阶段;在氮气中,这些木材的热解只有脱水过程和半纤维素、纤维素及木质素热解两个过程,其原因是木材在氮气中热解的残炭不会进一步被氧化为一氧化碳和/或二氧化碳。采用Kissinger法计算得到三种木材中木质素在空气中的降解活化能依次为红松(218 kJ/mol)、铁杉(146 kJ/mol)、云杉(188 kJ/mol)。The thermal properties of three kinds of woods ,pinus koraiensis, hemlock and spruce, which were taken from an ancient building, the Potala Palace in Lhasa of China were investigated by using thermogravimetric analysis method in air and nitrogen atmosphere. And the Kissinger method was applied to calculate the degradation activation energy of the lignin in the three woods. The results showed that there were three degrading stages for three kinds of woods in air, which corresponded to the water loss in woods, the degradation of the hemicelluloses, celluloses and lignin and oxidation of charred residues. However, there were only two degrading stages of the woods in nitrogen atmosphere, which corresponded to the water loss in woods, the degradation of the hemicelluloses, celluloses and lignin, because the charred residues of the wood could not be further oxidated in inert atmosphere. The degradation activation energy of the lignin in pinus koraiensis, hemlock and spruce woods was 218 kJ/mol, 146 k J/tool and 188 kJ/mol, respectively.

关 键 词：古建筑 木材 热重分析 降解 活化能 

分 类 号：X913[环境科学与工程—安全科学] TU252[建筑科学—建筑设计及理论]