NH4H2PO4和SiO2粉体对铝粉火焰传播特性的影响

doi:10.16265/j.cnki.issn1003-3033.2017.08.008

中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (8): 44-49.doi: 10.16265/j.cnki.issn1003-3033.2017.08.008

NH₄H₂PO₄和SiO₂粉体对铝粉火焰传播特性的影响

唐文文, 陈先锋教授, 牛奕^**, 张洪铭, 代华明, 王玉杰教授

武汉理工大学资源与环境工程学院,湖北武汉 430070

收稿日期:2017-04-26 修回日期:2017-07-03 出版日期:2017-08-20 发布日期:2020-10-13
通讯作者: **牛奕(1986—),男,河南安阳人,博士,讲师,主要从事安全工程专业方面的教学与科研工作。E-mail: niuyi@whut.edu.cn。
作者简介:唐文文(1994—),男,四川岳池人,硕士研究生,研究方向为工业防火防爆技术。E-mail: 208413@whut.edu.cn。
基金资助:
国家重点研发计划项目(2016YFC0802801,2017YFC0804705);国家自然科学基金资助(51174153,51374164)。

Effects of NH₄H₂PO₄ and SiO₂ power on propagation characteristics of aluminum dust flame

TANG Wenwen, CHEN Xianfeng, NIU Yi, ZHANG Hongming, DAI Huaming, WANG Yujie

School of Resources & Environmental Engineering, Wuhan University of Technology, Wuhan Hubei 430070,China

Received:2017-04-26 Revised:2017-07-03 Online:2017-08-20 Published:2020-10-13

摘要/Abstract

摘要： 为探索受限空间内惰性粉体对铝粉火焰结构及火焰传播特性的影响机制,利用小尺寸开口竖直管道和高速摄影仪和微细热电偶,研究添加质量分数为20%的NH₄H₂PO₄和SiO₂粉体时铝粉燃烧火焰形态、火焰温度和火焰传播速度等参数的分布特征。结果表明:NH₄H₂PO₄和SiO₂粉体能稀释铝粉尘云浓度,有效减弱反应强度;铝粉粒径增大,惰性粉体对铝粉最高火焰温度的抑制作用先增大后减小,当铝粉粒径为30 μm时,抑制效果最显著;惰性粉体对铝粉火焰传播速度的抑制作用与铝粉粒径负相关;NH₄H₂PO₄对铝粉火焰的抑制效果比SiO₂明显。

关键词: 惰性粉体, 铝粉, 火焰传播, 惰化抑制, 燃烧特性

Abstract: For the sake of exploring the mechanism by which inert powder affects structure and propagation characteristics of aluminium flame in a confined space, experiments were carried out. The flame shape, flame temperature and flame propagation velocity of aluminium flame were measured when 20% mass fraction of NH₄H₂PO₄ and SiO₂ powder were added to by using a small opening vertical pipe, a high-speed camera and a micro thermocouple. The results show that both NH₄H₂PO₄ and SiO₂ powder can dilute the concentration of aluminum powder and weaken the reaction intensity, that with increase of particle size of aluminum powder, the inhibition effect of inert powder on maximum flame temperature of aluminum powder firstly increases and then decreases, and the inhibition effect reaches the maximum when the particle size of aluminum powder is 30 μm, that the inhibition effect of inert powder on flame propagation velocity of aluminum powder is negatively correlated with the particle size of aluminum powder, and that the inhibition effect of NH₄H₂PO₄ powder on aluminum powder flame is more obvious than that of SiO₂.

Key words: inert powder, aluminum powder, flame propagation, inert inhibition, combustion characteristics

中图分类号:

X932

唐文文, 陈先锋, 牛奕, 张洪铭, 代华明, 王玉杰. NH₄H₂PO₄和SiO₂粉体对铝粉火焰传播特性的影响[J]. 中国安全科学学报, 2017, 27(8): 44-49.

TANG Wenwen, CHEN Xianfeng, NIU Yi, ZHANG Hongming, DAI Huaming, WANG Yujie. Effects of NH₄H₂PO₄ and SiO₂ power on propagation characteristics of aluminum dust flame[J]. China Safety Science Journal, 2017, 27(8): 44-49.

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NH₄H₂PO₄和SiO₂粉体对铝粉火焰传播特性的影响

Effects of NH₄H₂PO₄ and SiO₂ power on propagation characteristics of aluminum dust flame

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