Effect of spraying on coal dust diffusion in a coal mine based on a numerical simulation

被引：136
作者：
Ma, Qingxin [1 ,2 ]
Nie, Wen [1 ,2 ]
Yang, Shibo [1 ,2 ]
Xu, Changwei [1 ,2 ]
Peng, Huitian [1 ,2 ]
Liu, Zhiqiang [1 ,2 ]
Guo, Cheng [1 ,2 ]
Cai, Xiaojiao [1 ,2 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Safety & Environm Engn, Qingdao 266590, Peoples R China
[2] Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo, Qingdao 266590, Peoples R China
来源：
ENVIRONMENTAL POLLUTION | 2020年 / 264卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Dust pollution; Spraying for dust suppression; Numerical simulation; Spraying pressure; Nozzle caliber; MECHANIZED MINING FACE; PARTICLE REMOVAL EFFICIENCY; ATOMIZATION CHARACTERISTICS; AIR-CURTAIN; STRUCTURAL PARAMETERS; REDUCTION PERFORMANCE; INSTALLATION POSITION; SUPPRESSION DEVICE; VENTURI SCRUBBER; EXCAVATION FACE;
D O I：
10.1016/j.envpol.2020.114717
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Aimed at effectively controlling coal dust pollution in the mining face of a coal mine, this study first conducted a theoretical analysis and then combined a spraying experiment and a numerical simulation to perform an in-depth examination of the atomizing characteristics and dust suppression performance of a coal cutter external spraying device. Based on the experimental spraying results, the optimal nozzle was determined to be a pressure round-mouth nozzle with an X-shaped core. The characteristics of the spray fields from nozzles of different calibers (1.6, 2.0 and 2.4 mm) at different spraying pressures (2, 4, 6 and 8 MPa) were then analyzed. It was found that the droplet concentration in the spray field increased with increasing spraying pressure and nozzle caliber. The droplet diameter was mainly dependent on the spraying pressure and varied more slowly with increased spraying pressure. At a spraying pressure of 8 MPa, the spray field formed could achieve effective dust suppression; specifically, the droplet concentration in the spray field was mostly more than 15 g/m(3), and the droplet size was mainly distributed in the range of 30-100 mu m. When using a 2.4 mm caliber nozzle, the dust concentration measured around the coal cutter operator was reduced to 87.21 mg/m(3) under a spraying pressure of 8 MPa, suggesting adequate dust suppression. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：15
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