煤矿安全2019，Vol.50Issue(12)：28-31,4.DOI:10.13347/j.cnki.mkaq.2019.12.007
外旋射流破煤成孔过程及煤渣粒径分析
Coal Holes Forming Principle of Rotary Jets and Analysis of Coal Cinder Particle Size
摘要
Abstract
In order to study the pore-forming process of the rotary jet and the particle size distribution of the coal cinder after breaking coal. According to the theory of maximum tensile strain and the theory of maximum shear stress, the failure criterion of coal under shear stress and tensile stress is obtained. Based on the strength of 3.65 MPa, elastic modulus of 185 MPa, size of 1 m×0.8 m×0.8 m coal similar material, the coal breaking experiment under different pump pressures was carried out; the coal cinder from broken coal was collected and the particle size analysis experiment was carried out. The results show that the external drilling jet breaks the coal drilling speed and the pore diameter increases with the increase of the pump pressure. In the pore-forming process, the forward jet breaks the coal, the backward jet reams, and the failure of coal is mainly caused by tensile stress and shear stress. The coal cinder particle size distribution is from 84 μm to 1 061 μm. The larger the pump pressure, the smaller the particle size of the coal cinder.分类
矿业与冶金引用本文复制引用
刘正杰,王克全,刘延保,申凯,何立鹏,高华礼..外旋射流破煤成孔过程及煤渣粒径分析[J].煤矿安全,2019,50(12):28-31,4.基金项目
中煤科工集团重庆研究院自立创新引导重点资助项目(2018ZDXM05) （2018ZDXM05）
重庆市技术创新与应用示范资助项目(cstc2018jscs-msybX0067) （cstc2018jscs-msybX0067）
中煤科工集团重庆研究院科技创新创业资金专项资助项目(2018QN005) （2018QN005）
