| 引用本文: | 陈绍杰,陈举师,李改革,高杨,赵向锋.煤层干式钻孔粉尘质量浓度分布规律的数值模拟[J].哈尔滨工业大学学报,2019,51(10):123.DOI:10.11918/j.issn.0367-6234.201806054 |
| CHEN Shaojie,CHEN Jushi,LI Gaige,GAO Yang,ZHAO Xiangfeng.Numerical simulation of dust concentration distribution regularities during dry drilling in coal seam[J].Journal of Harbin Institute of Technology,2019,51(10):123.DOI:10.11918/j.issn.0367-6234.201806054 |
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| 煤层干式钻孔粉尘质量浓度分布规律的数值模拟 |
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陈绍杰1,2,陈举师2,李改革1,高杨3,赵向锋1
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(1.华北科技学院 安全工程学院,北京 101601; 2.北京科技大学 土木与资源工程学院,北京 100083; 3.中国核电工程有限公司,北京 100840)
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| 摘要: |
| 干式钻孔过程中,风力排渣系统将钻屑沿钻孔环状狭缝高速排出,会产生高浓度粉尘. 为有效地控制煤层干式钻孔粉尘污染,探寻影响粉尘分布的主要因素,确定出粉尘质量浓度较低的钻孔工艺参数配置,运用SolidWorks联合DesignModeler建模、Mesh划分网格、Fluent解算、CFD-Post后处理等手段,对不同边界条件下煤层干式钻孔粉尘质量浓度分布进行数值模拟,并与现场实测数据对比分析,两者基本吻合.研究结果表明:压风自环状狭缝喷出后速度急剧衰减,整体呈锥体分布,大颗粒钻屑喷出孔口后就地沉降,细小颗粒悬浮在空气中并随风流继续扩散；钻场内粉尘质量浓度沿程先急剧上升至一个最大值,后快速下降,再逐步缓慢降低；水平方向上,机道中央粉尘质量浓度最高、巷道中央次之、人行道中央最低；竖直方向上,粉尘质量浓度呈现出中间高、上下两侧低的分布规律；钻场风速、钻杆转速、供气压力、钻杆型式及钻孔类型是影响粉尘分布的5个主要因素；当钻场风速为0.5 m/s、钻杆转速为2 r/s、供气压力为0.8 MPa时,采用外平钻杆钻进斜平行预抽钻孔,可取得良好的减尘效果. 研究成果可有效地指导现场钻孔作业和防尘装置研发. |
| 关键词: 煤层干式钻孔 粉尘 质量浓度分布 影响因素 数值模拟 |
| DOI：10.11918/j.issn.0367-6234.201806054 |
| 分类号:TD714.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金青年科学基金(51604018);中央高校基本科研业务费(3142015105);国家重点研发计划(2016YFC0801702) |
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| Numerical simulation of dust concentration distribution regularities during dry drilling in coal seam |
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CHEN Shaojie1,2,CHEN Jushi2,LI Gaige1,GAO Yang3.ZHAO Xiangfeng1
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(1.School of Safety Engineering, North China Institute of Science and Technology, Beijing 101601, China;School of Civil & Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;3.China Nuclear Power Engineering Co., Ltd., Beijing 100840, China)
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| Abstract: |
| During the dry drilling process, wind slagging system discharges the cuttings along the annular slit of the drill at a high speed, which generates high concentration dust. In order to effectively control dust pollution during dry drilling in coal seam, the main factors that influence dust distribution were exploved and the drilling technology parameters with low dust concentration were determined. The numerical simulation of dust concentration distribution under different boundary conditions was carried out by using SolidWorks and DesignModeler to build models, using Mesh to divide the grids, using Fluent to calculate, and using CFD-Post to postprocess. Compared with field measurement of dust concentration,the simulating results basically agreed with the measured data. The result indicates that the velocity of pyramidal compressed air attenuated rapidly after the ejection from cyclic slit, and large drillings settled immediately near the orifice, while fine particles floated in the air and continued to spread with wind. Dust concentration in drilling field along the way rose sharply to a maximum value first, then dropped rapidly, and finally decreased gradually. In the horizontal direction, the dust concentration in the middle of the roadway was lower than that in the middle of the machine road, which had the highest dust concentration, and that in the center of the sidewalk was the lowest. In the vertical direction, the dust concentration distribution showed a feature that it was high in the middle and low in the upper and lower sides. The five main factors that affected the dust distribution were the wind speed in drilling field, the drill rod rotation speed, the pressure of the gas supply, the drill rod type, and the drilling type. When the wind speed was 0.5 m/s, the rotation speed was 2 r/s, and the gas pressure was 0.8 MPa, a good dust reduction effect was achieved by using outer flat drill rod to drill into the pre-drainage borehole of tilted parallel. The results can effectively guide the field operation of drilling and the development of dust control devices. |
| Key words: dry drilling in coal seam dust concentration distribution influence factors numerical simulation |
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