东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (10): 1492-1498.DOI: 10.12068/j.issn.1005-3026.2022.10.017

• 资源与土木工程 • 上一篇    下一篇

水分促使抛光铝粉热自燃临界温度和诱导时间

王鑫阳， 李刚   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 修回日期:2021-10-09 接受日期:2021-10-09 发布日期:2022-11-07
  • 通讯作者: 王鑫阳
  • 作者简介:王鑫阳(1983-)，男，辽宁沈阳人，东北大学博士后研究人员； 李刚(1969-)，男，河南信阳人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51774068)； 中国博士后科学基金资助项目(2020M670784)； 东北大学博士后科研基金资助项目(20200203)； 中央高校基本科研业务费专项资金资助项目(N2101039).

Critical Temperature and Induction Time of Spontaneous Combustion of Polished Al Powder Induced by Water

WANG Xin-yang， LI Gang   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Revised:2021-10-09 Accepted:2021-10-09 Published:2022-11-07
  • Contact: LI Gang
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摘要： 采用等温与非等温C80微量热试验及Semenov和Frank-Kamenetskii 热自燃理论对水分促使抛光铝粉热自燃的临界温度和各阶段诱导时间进行了研究.结果表明，Al2O3-H2O与Al-H2O反应均遵循Arrhenius动力学机制，反应活化能分别为61.7和 138.6kJ·mol-1；堆积铝粉热自燃诱导时间由两阶段组成，第一阶段为氧化铝薄膜水解时间，第二阶段为铝-水反应放热系统由环境温度达到不返还温度T○NR的时间，该时间取决于铝粉堆积状态和堆积质量.当环境温度为25℃时，第一阶段诱导时间为155.6h；当25kg铝粉以圆柱形集尘桶状态堆积时，相同环境温度下第二阶段诱导时间为0.7h，铝粉自燃临界温度为24.9℃，铝粉具有热自燃危险性，且诱导时间随堆积质量增加而延长.

关键词: 抛光铝粉；水分；热自燃；诱导时间；C80微量热

Abstract: Isothermal and non-isothermal C80 micro-calorimetry experiments and Semenov and Frank-Kamenetskii spontaneous combustion theory have been applied to study the critical temperature for spontaneous combustion of the polished aluminum powder induced by water and the induction time of each reaction stage. The results show that both Al2O3-H2O and Al-H2O reactions follow the Arrhenius kinetic mechanism， with the activation energy being equal to 61.7 and 138.6kJ·mol-1， respectively. The induction time of aluminum powder consists of two stages. The first stage is the time for alumina film hydrolysis， and the second stage is the time for the aluminum-water exothermic reaction system to reach the non-return temperature TNR from the ambient temperature， depending on the accumulation state and the deposit mass of the aluminum powder. When the ambient temperature is 25℃， the induction time of the first stage is 155.6h. When aluminum powder of 25kg is deposited in a cylindrical dust collecting drum， the induction time of the second stage is 0.7h with the same ambient temperature， and the critical temperature for spontaneous combustion is 24.9℃. The aluminum powder has the risk of spontaneous combustion， and the induction time increases as the deposit mass increases.

Key words: polished aluminum powder; water; spontaneous combustion; induction time; C80 micro-calorimetry

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