破碎后微小煤颗粒分布与破碎功关系实验研究

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。

Experimental study on the relationship between the distribution of micro coal particles and the crushing energy

Under the different conditions of crushing experiments for outburst-prone and non outburst-prone coal,the relationship between particle size distribution law and specific surface area and crushing specific work was analyzed after being pulverized coal sieve.The experimental results show that:the percentage of coal particles which are less than 0.075 mm is very little,but there is a marvelous surface area;the quality (< 0.075 mm) of the distribution above a sieve which is the outburst-prone coal obeys the Gauss distribution,but the non outburst-prone coal obeys the normal distribution;the specific surface area increases with the increase of the energy under the same block degree,and the specific surface area of the outburst-prone coal is 1-2 times of the non outburst-prone coal under the same energy;the new surface area increases exponentially with the increasing of energy,but the increasing rate decreases with the increase of the energy.This research can reveal the relationship between coal materials after crushing the distribution of particle size and crushing energy,to provide the experimental basis to the energy dissipation of analysis in the process of coal and gas outburst.