摘要
为研究古建筑中典型木制家具材料的热解燃烧行为,以酸枝木和鸡翅木为研究对象,采用热重-差示扫描量热联用技术(TG-DSC),在不同升温速率(β=20、30、40 K/min)和不同气氛条件下,对2种木材的热解燃烧特性和动力学进行系统分析。热解燃烧特性分析结果表明:2种木材的热解燃烧过程可划分为失水干燥、热解燃烧、焦炭燃烧和燃尽4个阶段;酸枝木燃烧过程相对缓和、均匀,而鸡翅木则表现出燃烧剧烈、放热集中等特征;随着升温速率的提高,热解燃烧阶段的放热强度增强,表明升温速率对热解反应具有显著的强化作用;在空气气氛下,2种木材的热解燃烧反应加剧,质量损失速率加快,放热强度进一步增强,燃烧更趋彻底。动力学分析结果表明:酸枝木的活化能在空气气氛下低于鸡翅木,其热解燃烧反应相较于鸡翅木更易发生,火灾危险性更高。研究结果可为古建筑防火安全评估及木制文物保护提供数据参考和理论支持。
In order to study the pyrolysis combustion behavior of typical wooden furniture materials in ancient buildings,Dalbergia spp.and millettia laurentii were used as the research objects,the pyrolysis combustion characteristics and kinetics of the two woods were systematically analyzed by thermogravimetry-differential scanning calorimetry(TG-DSC)at different heating rates(β=20、30、40 K/min)and different climatic condition.The results of pyrolysis combustion characteristics analysis show that the pyrolysis combustion process of the two types of wood could be divided into four stages:water loss and drying,pyrolytic combustion,char combustion and burnout.The combustion process of Dalbergia spp.is relatively gentle and uniform,while Milletia laurenti shows the characteristics of intense combustion and concentrated exotherm.The exothermic intensity of the pyrolytic combustion stage increased with the increase of the heating rate,indicating that the heating rate has a significant strengthening effect on the pyrolytic reaction.Under the air atmosphere,the pyrolytic combustion reaction of the two woods was intensified,the mass loss rate was accelerated,the exothermic intensity was further enhanced,and the combustion was more thorough.The results of kinetic analysis showed that the activation energy of Dalbergia spp was lower than that of Milletia laurenti.in air atmospheres,and its pyrolysis combustion reaction was more likely to occur and the fire hazard was higher than that of Milletia laurenti.This study can provide data reference and theoretical support for the fire safety assessment of ancient buildings and the protection of wooden cultural relics.
作者
康雪峰
李伟
田雨桐
郑斌
张泽林
KANG Xuefeng;LI Wei;TIAN Yutong;ZHENG Bin;ZHANG Zelin(Datong Fire Rescue Detachment,Datong Shanxi 037009,China;China University of Mining and Technology(Beijing),Beijing 100083,China;China Fire and Rescue Institute,Beijing 102202,China)
出处
《安全》
2025年第8期89-96,共8页
Safety & Security
基金
北京市科技计划“揭榜挂帅”项目(S2023105000011)。
关键词
古建筑
热解燃烧
热重
升温速率
动力学分析
ancient buildings
pyrolysis combustion
thermogravimetric method
heating rate
kinetic analysis
