主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2020, Vol. 39 ›› Issue (12): 1641-1644.

• • 上一篇    下一篇

沥青在贫氧气氛下的热解动力学实验研究

岳海玲   

  1. 中国人民警察大学侦查学院，河北廊坊065000
  • 出版日期:2020-12-15 发布日期:2020-12-15
  • 作者简介:岳海玲(1980-)，女，山西长治人，中国人民警察大学侦查学院副教授，主要从事消防安全研究，河北省廊坊市安次区西环路220 号，065000。
  • 基金资助:
    中国人民警察大学国家自然科学基金培育项目（ZKJJPY201902）

Experimental study on the pyrolysis characteristics and kinetics of asphalt under poor oxygen concentrations

YUE Hai-ling   

  1. Investigation Institute, China People’s Police University,Hebei Langfang 065000, China
  • Online:2020-12-15 Published:2020-12-15

摘要：

隧道内沥青热解燃烧通常在贫氧环境下进行。为研究沥青在真实火灾情况下，环境氧体积分数对其热解过程和动力学的影响，利用热重分析仪，对10#铺地基质沥青，在氧体积分数分别为0、7%、15%和21%的氧氮混合气氛下进行热解实验，研究沥青的热解过程，并进行动力学分析。结果表明：沥青在氧体积分数为0(纯N2)的气氛下热解过程只有一个主失重阶段，最终剩余量高；在有氧气氛下热解过程均呈现出3 个失重阶段，最终剩余量低于10%；随着氧体积分数的增加，沥青的起始分解温度升高、热解速度增加、高温段失重加剧，低温段活化能小幅降低，反应过程均属于扩散模型；高温段活化能在氧体积分数为21%时最高，反应模型由贫氧时的扩散模型转变为三级简单模型。


关键词: 沥青, 氧体积分数, 热解, 动力学

Abstract: Most of the pyrolysis and combustion of asphalt is under the oxygen-poor environment during tunnel fire. In order to study the effects of ambient oxygen concentration on asphalt under real fire, the pyrolysis kinetic characteristics of 10# asphalt under different oxygen volume concentrations (0, 7% , 15% ,21% ) were investigated by thermogravimetric (TG) analysis.The pyrolysis process of asphalt under different oxygen concentration was studied, and the kinetic analysis was performed. Results showed that there is only one main weight-loss stage in the pyrolysis process of asphalt in the atmosphere of 0% (N2) oxygen concentration, and the ratio of residual mass is the highest.Presence of oxygen in the atmosphere change the weight- loss stagefrom one to three, and the ratio of residual mass is less than 10%. With the increase of oxygen concentration, the initial decomposition temperature of asphalt and the pyrolysis speed increases, the weight- loss rate in the high- temperature section accelerates, while the activation energy in the low- temperature section decreases. The reaction process basically consistent with the diffusion model. The activation energy in high-temperature section is the highest at 21% oxygen concentration, and the reaction model changes from the diffusion model when the oxygen is poor to the three-stage simple model.

Key words: asphalt, oxygen concentration, pyrolysis, kinetics