不同硬度块煤冲击破碎后粒度分布特征试验研究  

Experimental study on particle size distribution characteristics of coal with different hardness under impact crushing

作　　者：赵翼 李全贵 胡千庭[1,2] 曹偈 孙宵一[1,2] ZHAO Yi;LI Quangui;HU Qianting;CAO Jie;SUN Xiaoyi(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing 400044,China;School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China)

机构地区：[1]煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学资源与安全学院,重庆400044 [3]瓦斯灾害监控与应急技术国家重点实验室,重庆400037

出　　处：《矿业安全与环保》2020年第2期1-6,共6页Mining Safety & Environmental Protection

基　　金：国家科技重大专项(2016ZX05045004)。

摘　　要：为了探究不同硬度的块煤在冲击破碎作用下破碎后的粒度分布特征,利用坚固性系数实验装置,对4种不同硬度的块煤进行了冲击破碎试验研究,试验结果表明:破碎功与块煤破碎后的新增表面积成线性关系,折算直径与破碎功成反比。块煤破碎后具有自相似特征,其分形维数能够反映煤的破碎程度,分形维数越大,破碎效果越好,坚固性系数f与分形维数D呈线性关系。颗粒在破碎过程中,大颗粒因周边小颗粒的存在而受到缓冲作用,使得较小颗粒由于挤压作用而优先破碎,小颗粒的缓冲作用增强了大颗粒抵抗破碎的能力,因此较小颗粒反而更容易破碎。In order to explore the particle size distribution characteristics of lump coal after crushing with different hardness under impact crushing,the impact crushing experiments of four different hardness lump coals were carried out by using the Protodyakonov coefficient measuring device.The experimental results show that the crushing energy is linear with the newly added surface area after the lump coal is broken,and the converted diameter is inversely proportional to the crushing energy.The lump coal has self-similar characteristics after crushing,and its fractal dimension can reflect the crushing degree of coal.The larger the fractal dimension,the better the fracture effect,and the solidity coefficient f is linear with the fractal dimension D.During the crushing process,the large particles are buffered by the presence of surrounding small particles,so that the smaller particles are preferentially destroyed due to extrusion,and the buffering effect of small particles enhances the ability of the large particles to resist crushing,so the smaller particles are more likely to be broken.

关 键 词：块煤 坚固性系数 冲击破碎 破碎功 粒径分布 分形维数 

分 类 号：TD713[矿业工程—矿井通风与安全]