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 ›› 2021, Vol. 40 ›› Issue (1): 25-28.

• • 上一篇    下一篇

点火延迟时间对镁粉尘云爆炸特性影响研究

凤文桢，熊新宇，高凯，李斌，解立峰   

  1. 南京理工大学化工学院，江苏南京210094
  • 出版日期:2021-01-15 发布日期:2021-01-15
  • 作者简介:凤文桢(1996-)，男，安徽宣城人，南京理工大学化工学院硕士研究生，主要从事粉尘爆炸防护研究，江苏省南京市玄武区孝陵卫街道200 号，210094。
  • 基金资助:
    江苏省研究生科研与实践创新计划项目(KYCX19＿0256)

Influence of ignition delay time on explosion characteristics of magnesium dust cloud

FENG Wen-zhen，XIONG Xin-yu， GAO Kai，LI Bin，XIE Li-feng   

  1. School of Chemical Engineering, Nanjing University of Science and Technology, Jiangsu Nanjing 210094, China  

  • Online:2021-01-15 Published:2021-01-15

摘要：

利用20 L 柱形爆炸容器，开展不同点火延迟时间及镁粉质量浓度条件下的镁粉尘云爆炸特性研究。结果表明：镁粉尘云质量浓度低于200 g/m3，随着点火延迟时间增加，pmax 及(dp/dt)max 逐渐减小；质量浓度大于200 g/m3，pmax 和(dp/dt)max 呈现先增大再减小的趋势；镁粉尘浓度较高时，点火延迟时间对于pmax 的影响远小于质量浓度较低时。镁粉质量浓度较低时，最佳点火延迟时间随质量浓度增大而增大；镁粉质量浓度大于450 g/m3 时，最佳点火延迟时间均为60 ms。相同镁粉质量浓度条件下，随着点火延迟时间增大，爆炸冲量曲线呈锯齿状趋势；相同点火延迟时间条件下，镁粉质量浓度越高，爆炸冲量越大。

关键词: 镁粉, 质量浓度, 点火延迟时间, 爆炸特性

Abstract: Using 20 L cylindrical explosion vessel, the effect of different ignition delay time and mass concentration on explosion characteristics of magnesium powder was studied. The results showed that: when the mass concentration of magnesium dust cloud is lower than 200 g/m3, pmax and (dp/dt)max gradually decrease with the increase of ignition delay time; when the mass concentration is greater than 200 g/m3, pmax and (dp/dt)max increase first and then decrease; when the concentration of magnesium dust is high, the effect of ignition delay time on pmax is much less than that of low mass concentration. When the mass concentration of magnesium powder is low, the best ignition delay time increases with the increase of mass concentration; when the mass concentration of magnesium powder is more than 450 g/m3, the best ignition delay time is 60 ms. Under the condition of the same mass concentration of magnesium powder, with the increase of ignition delay time, the curve of explosion impulse presents a zigzag trend; under the same ignition delay time, the higher the mass concentration of magnesium powder is, the greater the explosion impulse will be.

Key words: magnesium powder, mass concentration, ignition delay time, explosive characteristics