GUAN Wenling,LI Xueyuan,DONG Chengjie

(School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384,China)

Abstract：In order to study the inhibition effect of CaCO3,Al(OH)3,NaHCO3 and NH4H2PO4 these four kinds of inorganic inert media on the flour explosion phenomenon,the experiments of flour explosion were carried out with 20 L spherical explosive apparatus.The explosion suppression mechanism of inorganic inert medium was discussed by particle size analysis and thermogravimetric analysis.The results show that the dust explosion can be inhibited by four inert media and the maximum explosion pressure decreases with the increase of the mass fraction of inorganic inert medium.When the mass fraction of inorganic inert medium is less than or equal to 50%,the particle size of the inhibitor is of great significance on the maximum explosion pressure.The smaller the particle size is,the better the explosion suppression effect will be.CaCO3 has the best inhibition effect due to its small particle size and high dispersion.When the mass fraction of inorganic inert medium is more than 50%,NaHCO3 has the best explosion suppression effect because of its lowest decomposition temperature.The decomposition products of NaHCO3 can absorb heat and interrupt the chain reaction of flour explosion.

Keywords：dust explosion; inorganic inert medium; particle size; maximum explosion pressure; explosion suppression mechanism

中图分类号：X932

文献标志码：A

文章编号：1008-5548(2021)01-0065-06

DOI：10.13732/j.issn.1008-5548.2021.01.008

收稿日期：2020-06-28，修回日期：2020-09-24，在线出版时间：2020-11-02 10:38。

第一作者简介：关文玲(1978—),女,博士,副教授,硕士生导师,研究方向为危险化学品安全技术。E-mail:hjgwl@163.com。

通信作者简介：董呈杰(1978—),男,博士,讲师,主要从事计算流体力学模拟等方面的研究。E-mail:dongchj@tjut.edu.cn。