Li Zhen, Jing Deji, Ge Shaocheng, Meng Xiangxi, Yang Di, Ren Shuaishuai
College of Safety Science and Engineering, Liaoning Technical University, Fuxin, China.
School of Resources and Environmental Engineering, Jilin Institute of Chemical Technology, Jilin, China.
Sci Rep. 2024 Apr 23;14(1):9312. doi: 10.1038/s41598-024-60192-6.
In order to efficiently and accurately control coal dust pollution in coal mining faces, this study addresses the insufficient research on the dust generation mechanism during cutting. Firstly, a similar experimental platform for simulating coal wall cutting with a drum cutter was used to investigate the changes in coal wall fragmentation and dust generation at drum speeds of 35 r/min, 50 r/min, 65 r/min, and 80 r/min. The experimental results revealed that the degree of coal wall fragmentation and dust generation increased with the increase in rotational speed, leading to a wider range of particle size distribution and an increase in the generation of fine dust particles. A 1:1 scale discrete element simulation of coal wall cutting with a drum cutter was conducted based on the experiments. The results indicated that, under the four rotational speeds, the cracks generated during coal wall fracture were predominantly tensile cracks, accounting for over 76% of the total crack count. The total number of cracks increased from 10,600 to 11,200, the number of free single particles increased from 2555 to 2728, and the fragmentation volume increased from 0.021607 to 0.023024 m. The range and degree of coal wall fragmentation increased with the increase in drum speed.
为了高效、准确地控制采煤工作面的煤尘污染，本研究针对截割过程中粉尘产生机理的研究不足展开探讨。首先，利用相似材料实验平台模拟滚筒采煤机截割煤壁，研究滚筒转速分别为35 r/min、50 r/min、65 r/min和80 r/min时煤壁破碎及粉尘产生情况。实验结果表明，煤壁破碎程度和粉尘产生量随转速增加而增大，导致粒径分布范围变宽，细粉尘颗粒产生量增加。基于实验进行了滚筒采煤机截割煤壁的1:1比例离散元模拟。结果表明，在四种转速下，煤壁断裂过程中产生的裂纹以拉伸裂纹为主，占裂纹总数的76%以上。裂纹总数从10600条增加到11200条，自由单颗粒数量从2555个增加到2728个，破碎体积从0.021607立方米增加到0.023024立方米。煤壁破碎的范围和程度随滚筒转速的增加而增大。
