破碎后微小煤颗粒分布与破碎功关系实验研究

发布时间：2018-01-02 18:21

本文关键词：破碎后微小煤颗粒分布与破碎功关系实验研究　出处：《煤炭学报》2016年12期 　论文类型：期刊论文

【摘要】：对突出/非突出原煤在不同条件下进行破碎实验,将碎煤分筛后分析粒级分布规律及比表面积与破碎比功之间关系。实验表明:0.075 mm煤颗粒所占质量比不多,却占有相当大的表面积;突出煤0.075 mm颗粒筛上质量分布服从Gauss分布而非突出煤服从正态分布;在相同块度前提下,比表面积随能量增加而增加;当时间相同能量时,突出煤的比表面积是非突出煤的1~2倍;新增表面积随能量增加呈指数增长,增加的速率却随能量增加而减小。揭示煤材料破碎后粒径分布规律与破碎功之间关系,为煤瓦斯突出过程中能量耗散分析提供实验依据。
[Abstract]:The crushing experiment of outburst / non-outburst raw coal was carried out under different conditions. The particle size distribution and the relation between the specific surface area and the crushing specific work were analyzed by sifting the broken coal. The experimental results show that the mass ratio of 0. 075 mm coal particles is not much, but it occupies a large surface area. The mass distribution of outburst coal on 0.075mm granular sieve was distributed from Gauss rather than from normal distribution of outburst coal suit. The specific surface area increases with the increase of energy. When the time is the same, the specific surface area of outburst coal is 1 / 2 times of that of non-outburst coal. The increased surface area increases exponentially with the increase of energy, but the increasing rate decreases with the increase of energy. It provides experimental basis for the analysis of energy dissipation in the process of coal and gas outburst.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;
【基金】：国家自然科学基金资助项目(51174241,51204217)
【分类号】：TD713
【正文快照】： 煤与瓦斯突出是煤矿生产过程中破碎煤体随瓦斯剧烈喷出的一种极其复杂的动力现象[1-2]。与煤矿其他动力灾害相比,突出煤高度粉碎,其中掺杂大量煤粉[3]。突出时,能量很大一部分消耗于煤的破碎,而破碎实质上是获得能量的固体产生新表面从原体分离出去的过程。自从B.B.霍多特[4]

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