微米级铝粉的爆炸特性及其反应机理研究  

Investigation on Explosion Characteristics and Reaction Mechanism of Micro-Aluminum Powder

作　　者：李庆钊[1] 王可[1] 梅晓凝 郑苑楠 林柏泉[1] 

机构地区：[1]中国矿业大学安全工程学院煤矿瓦斯与火灾防治教育部重点实验室,徐州221116

出　　处：《工程热物理学报》2017年第1期219-225,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51204169,No.51574230);江苏省自然科学基金资助项目(No.BK20131115)

摘　　要：基于标准20 L球形爆炸装置,系统研究了6种不同粒径微米级铝粉的爆炸特性,并结合SEM和XRD对爆炸产物的微结构特征进行了分析。研究结果表明,相同粉尘浓度条件下爆炸超压与颗粒粒径表现为二次函数的关系,而爆炸超压上升速率则随着粒径的减小按指数增加;颗粒的燃烧时间与颗粒的粒径均表现为沿幂函数增加;相同粉尘浓度条件下细颗粒铝粉爆炸过程主要受氧气扩散的控制,而大颗粒铝粉颗粒的爆炸过程则主要受铝粉颗粒的熔融控制。Based on the standard 20 L spherical explosive devices,explosion characteristics of six kinds of micro-aluminum powder with different diameters were investigated.Using SEM and XRD,micro structures of explosion products were analyzed.Results show that dust explosion pressure would be increased as quadratic function with the increasing of particle size at the same dust concentration conditions.But,the pressure rise rate increase exponentially with the decreasing of particle size.In addition,dust burning time would be prolonged with the increasing of particle size as power functions.At the same dust concentration conditions,explosion reactions of finer particles are mainly affected by the oxygen diffusion,however,would be the explosion process of large particles are mainly controlled by particles melt mechanism.

关 键 词：微米铝粉 爆炸特性 反应机理 20L爆炸球 

分 类 号：TD714.1[矿业工程—矿井通风与安全]