碎软煤层空气定向钻进煤粉运移规律数值模拟研究  

Numerical simulation of pulverized coal migration law in air directional drilling in broken soft coal seam

作　　者：聂超 王毅 姚亚峰[1,2] NIE Chao;WANG Yi;YAO Yafeng(China Coal Research Institute,Beijing 100013,China;China Coal Technology and Engineering Group Xi’an Research Institute Co.,Ltd.,Xi’an 710077,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤矿安全》2022年第3期175-180,共6页Safety in Coal Mines

基　　金：国家重大科技专项资助项目(2016ZX05045-003-002)。

摘　　要：为研究粒径和风量对煤粉在钻杆与孔壁环空内沉积、运移和分布规律的的影响,以碎软煤层空气定向钻进成孔为背景,利用欧拉-欧拉模型,对压缩空气输送煤粉颗粒形成的气固两相流进行数值模拟。结果表明:风量越大,颗粒粒径越小,煤粉的沉积程度越小,对煤粉的输送能力越强,相应的孔底压强越大;在同一风量下,小粒径煤粉主要呈现螺旋线翻滚向孔口输送,大颗粒煤粉则主要位于中下部沿特定轨迹向孔口移动。In order to study the effect of particle size and air volume on the deposition,migration and distribution law of pulverized coal in the annulus of drill pipe and hole wall,the Euler-Euler model is used to numerically simulate the gas-solid two-phase flow formed by compressed air transporting pulverized coal particles against the background of air directional drilling into the hole in a broken soft coal seam.The higher the airflow,the smaller the particle size,the smaller the deposition of coal dust,the stronger the transport capacity of coal dust,and the corresponding pressure at the bottom of the pore is larger.Under the same airflow,the small particle size coal dust mainly appears to roll in a spiral line to transport to the orifice,while the large particle size coal dust is mainly located in the middle and lower part to move to the orifice along a specific trajectory.

关 键 词：碎软煤层 空气定向钻进 煤粉沉积程度 风量 煤粉粒径 

分 类 号：TD712[矿业工程—矿井通风与安全]