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
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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。Abstract: 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.
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[1] 胡省三，成玉琪.21世纪前期我国煤炭科技重点发展领域探讨[J].煤炭学报，2005（1）：1-7. HU Shengsan, CHENG Yuqi. Discussions on key development fields of China’s coal science and technology at early stage of 21st century[J]. Journal of China Coal Society, 2005（1）: 1-7.
[2] 刘春.松软煤层瓦斯抽采钻孔塌孔失效特性及控制技术基础[D].徐州：中国矿业大学，2014. LIU Chun. Study on mechanism and controlling of borehole collapse in soft coal seam[D]. Xuzhou: China University of Mining and Technology, 2014.
[3] 刘建林，刘飞，李泉新，等.碎软煤层瓦斯抽采钻孔孔壁稳定性分析[J].煤矿安全，2018，49（8）：189-193. LIU Jianlin, LIU Fei, LI Quanxin, et al. Stability analysis of borehole wall for gas drainage boreholes in broken soft coal seam[J]. Safety in Coal Mines, 2018, 49（8）: 189-193.
[4] 刘飞，梁道富，刘建林，等.碎软煤层空气复合定向钻进工艺技术[J].煤矿安全，2019，50（7）：116-119. LIU Fei, LIANG Daofu, LIU Jianlin, et al. Air compound directional drilling technology in broken soft seam[J]. Safety in Coal Mines, 2019, 50（7）: 116-119.
[5] 黄长国.松软煤层钻孔施工三通道反循环排渣动力学机制研究[D].淮南：安徽理工大学，2020. HUANG Changguo. Research on the dynamic mechanism of three-channel reverse circulation slag discharge in soft coal deam drilling[D]. Huainan: Anhui University of Science and Technology, 2020.
[6] 孔庆军，褚志伟.碎软煤层气动定向钻进技术在青龙煤矿的应用[J].工矿自动化，2020，46（10）：14-18. KONG Qingjun, CHU Zhiwei. Application of pneumatic directional drilling technology for soft-fragmentized coal seam in Qinglong Coal Mine[J]. Industry and Mine Automation, 2020, 46（10）: 14-18.
[7] 冀前辉.煤矿井下碎软煤层泡沫钻进关键技术研究[D].北京：煤炭科学研究总院，2020. JI Qianhui. Research on key technology of foam drilling in underground broken soft coal seam[D]. Beijing: China Coal Research Institute, 2020.
[8] 王巍，管清亮，张建胜.水平管煤粉气力输送流型实验研究[J].中国粉体技术，2014，20（6）：21-24. WANG Wei, GUAN Qingliang, ZHANG Jiansheng. Experimental study on flow patterns in horizontal pneumatic conveying of pulverized coal powders[J]. China Powder Science and Technology, 2014, 20（6）: 21-24.
[9] 方薪晖，安海泉，刘臻，等.煤粉气力输送管道压降的工艺模拟研究[J/OL].煤炭学报，2020:1-11.https://doi.org/10.13225/j.cnki.jccs.2020.1148. FANG Xinhui, AN Haiquan, LIU Zhen, et al. Simulation and analysis for pressure drop of pneumatic conveying of pulverized coal[J/OL]. Journal of China Coal Society, 2020: 1-11.https://doi.org/10.13225/j.cnki.jccs.2020.1148.
[10] 周海军，熊源泉.曳力模型对水平管高压密相气力输送模拟的影响[J].东南大学学报（自然科学版），2020， 50（3）：496-506. ZHOU Haijun, XIONG Yuanquan. Effect of drag models on simulation of dense-phase pneumati conveying in horizontal pipe under high pressure[J]. Journal of Southeast University（Natural Science Edition）, 2020, 50（3）: 496-506.
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