中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (2): 83-89.doi: 10.16265/j.cnki.issn1003-3033.2022.02.012

• 安全工程技术 • 上一篇    下一篇

自然老化木材燃烧过程热行为特性研究

邓军1(), 宋佳佳1, 赵婧昱1, 刘同双1, 卢世平1, 赵彦丽2   

  1. 1 西安科技大学 安全科学与工程学院,陕西 西安 710054
    2 上海应用技术大学 城市建设与安全工程学院,上海 201418
  • 收稿日期:2021-11-08 修回日期:2022-01-15 出版日期:2022-08-18 发布日期:2022-08-28
  • 作者简介:

    邓 军 (1970—),男,四川大竹人,博士,教授,博士生导师,主要从事火灾的机制、预测及防治技术等方面的研究。E-mail:

    赵婧昱 副教授

    赵彦丽 讲师

  • 基金资助:
    陕西省教育厅青年创新团队建设科研计划项目(21JP074); 陕西省教育厅专项科研计划项目(20JK0769)

Analysis on thermal characteristics of naturally aging wood during combustion

DENG Jun1(), SONG Jiajia1, ZHAO Jingyu1, LIU Tongshuang1, LU Shiping1, ZHAO Yanli2   

  1. 1 School of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China
    2 School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
  • Received:2021-11-08 Revised:2022-01-15 Online:2022-08-18 Published:2022-08-28

摘要:

为提供古建筑火灾数值模拟及风险评估的基础理论,从自然老化角度入手,选取经过长久自然老化的建筑服役木材作为研究对象,通过扫描电镜(SEM)及热物性试验对比分析自然老化木材与参照木材的外观形态及热传导特征;采用差示扫描量热DSC法,研究自然老化木材在燃烧过程中热释放的阶段特性,分析不同升温速率对老化木材热行为影响特征;基于热流计算并分析老化木材在热反应过程表观活化能分布。结果表明:自然老化木材热扩散能力增强;自然老化作用可降低木材着火及燃烧过程所需能量;其对于木材着火前期能量需求的影响较大,大大降低木材燃烧过程需要的峰值能量壁垒。

关键词: 老化木材, 古建筑, 热行为, 升温速率, 表观活化能

Abstract:

In order to provide the basic theory for numerical simulation and risk assessment of historic building fire, with naturally aging wood as research object, their appearance and thermal conduction characteristics and those of reference wood were analyzed by scanning electron microscopy (SEM) and thermal property test from the perspective of natural aging. Then, their thermal release features at different stages during combustion were studied by using differential scanning calorimetry (DSC), and effects of different heating rates on thermal behavior of aging wood were analyzed. Finally, their apparent activation energy distribution during thermal reaction was calculated and analyzed based on heat flow. The results show that the thermal diffusion ability of naturally aging wood is enhanced. Natural aging reduces the energy required in the ignition and combustion process of wood, and has a great influence on energy demand before ignition, thus greatly reducing peak energy barrier needed during ignition.

Key words: aging wood, historic building, thermal behavior, heating rate, apparent activation energy