关文玲,李雪源,董呈杰
（天津理工大学 环境科学与安全工程学院,天津 300384）
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。
摘要：为研究CaCO3、Al(OH)3、NaHCO3、NH4H2PO44种无机惰性介质对面粉爆炸现象的抑制效果，采用20 L球形爆炸仪进行面粉爆炸实验;通过进行粒径分析和热重分析，探讨无机惰性介质的抑爆机理。结果表明:4种惰性介质对面粉粉尘的爆炸均有抑制作用，最大爆炸压力随着无机惰性介质的质量分数的增大而减小;当无机惰性介质质量分数≤50%时，粒径是影响最大爆炸压力的最主要的因素，粒径越小抑爆效果就越好，CaCO3由于其粒径小、分散度高而抑爆效果最好;当无机惰性介质质量分数>50%时，NaHCO3因其分解温度最低、分解产物能够吸热并中断面粉爆炸链式反应而抑爆效果最好。
关键词：粉尘爆炸;无机惰性介质;粒径;最大爆炸压力;抑爆机理
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
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