Development of a Respirable Dust Mitigation System for a High Longwall Face at Sihe Colliery in China - a Case Study
Keywords:CFD modeling, dust mitigation, health and safety, longwall mining, respirable dust.
Dust is a major hazard in underground coal mines that threatens the work health and safety of coal miners. The dust issue becomes increasingly significant with the development of highly mechanized coal mining. This issue is particularly serious at the high longwall faces of the Sihe colliery in China as the concentration of dust, in particular respirable dust, at these faces far exceeds the regulatory dust limits. Field testing and computational fluid dynamics (CFD) simulations were conducted to understand the sources of dust generation and its dynamic movement in the #5301 longwall face of high-cutting height at the colliery. The investigation results showed that shearer generated dust was minimal during the coal cutting operation; that face spalling and chock movement were the main dust generating sources, causing significant contamination to the walkway; and that the majority of dust particles from the face (regardless of source) eventually disperse into the main gate, where the dust concentration was greater than 500 mg/m3. These findings were used to develop an effective coal dust mitigation system involving the installation of dust scrubbers, curtains, and venture and crescent sprays. The results of CFD modeling indicate that the dust concentration could be significantly reduced by adopting the new dust mitigation system.
National Institute of Occupational Safety and Health (NIOSH), Best Practices for Dust Control in Coal Mining, Pub. No. 2010-110, Pittsburgh, PA:NIOSH, USA, 2010.
Petsonk, E.L., Rose, C. & Cohen, R., Coal Mine Dust Lung Disease, American Journal of Respiratory and Clinical Care Medicine, 187(11), pp. 1178-1185, 2013.
Zheng, Y.P., Feng, C.G., Jing, G.X., Qian, X.M., Li, X.J., Liu, Z.Y. & Huang, P., A Statistical Analysis of Coal Mine Accidents Caused by Coal Dust Explosions in China, Journal of Loss Prevention in the Process Industries, 22(4), pp. 528-532, 2009.
China National Health and Family Planning Commission (CNHFPC), Bulletin for Occupational Disease Prevention and Control Work in 2009-2014, Beijing, China (in Chinese), 2015.
State Administration of Coal Mine Safety (SACMS), Safety Regulations in Coal Mines 2008, Beijing, China (in Chinese), 2008.
New South Wales Government, Notice-Airborne Dust Limits, Collection and Analysis, Sydney, Australia, 2007.
Colinet, J.F., Rider, J.P., Listak, J.M., Organiscak, J.A. & Wolfe, A.L., Best Practices for Dust Control in Coal Mining, United States Information Circular 9517, National Institute for Occupational Safety and Health (NIOSH), Pittsburgh, USA, 2010.
Plush, B., Ren, T. & Aziz, N., A Critical Evaluation of Dust Sampling Methodologies in Longwall Mining in Australia and the USA, In: Aziz, N. (ed.) 12th Underground Coal Operators Conference, University of Wollongong, Wollongong, Australia, 2012.
Aziz, N., Cram, K. & Hewitt, A., Mine Dust and Dust Suppression, In: Kininmonth, R.J. and Baafi, E.Y. (eds.), Australian Coal Mining Practice, Third ed.: Australasian Institute of Mining and Metallurgy, Melbourne, Australia, 2009.
McPherson, M.J., Subsurface Ventilation Engineering (2nd edition), Published by Mine Ventilation Services Inc., Fresno, California, USA, 2009.
Wang, H., Wang, D., Lu, X., Gao, Q., Ren, W. & Zhang, Y., Experimental Investigation of the Performance of a New Design of Foaming Agent Adding Device Used for Dust Control in Underground Coal Mines, Journal of Loss Prevention in the Process Industries, 25(6), pp. 1075-1084, 2012.
Wang, H., Wang, D., Tang, Y., Qin, B. & Xin, H., Experimental Investigation of the Performance of a Novel Foam Generator for Dust Suppression In Underground Coal Mines, Advanced Powder Technology, 25(3), pp. 1053-1059, 2014.
Goodman, G.V.R., Using Water Sprays to Improve Performance of a Flooded-Bed Dust Scrubber, Applied Occupational and Environmental Hygiene, 15(7), pp. 550-560, 2000.
Pollock, D. & Organiscak, J., Airborne Dust Capture and Induced Airflow of Various Spray Nozzle Designs, Aerosol Science and Technology, 41(7), pp. 711-720, 2007.
Lauder, B.E. & Spalding, D.B., Mathematical Models of Turbulence, Academic Press, 1972.
Hargreaves, D.M. & Lowndes, I.S., The Computational Modeling of the Ventilation Flows Within a Rapid Development Drivage, Tunnelling and Underground Space Technology, 22(2), pp. 150-160, 2007.
Moloney, K.W. & Lowndes, I.S., Comparison of Measured Underground Air Velocities and Air Flows Simulated by Computational Fluid Dynamics, Trans. Inst. Min. Metall. Sect. A - Min. Technol., 108, pp. A105-A114, 1999.
Ren, T., Wang, Z. & Cooper, G., CFD Modeling of Ventilation and Dust Flow Behavior Above an Underground Bin and the Design of an Innovative Dust Mitigation System, Tunnelling and Underground Space Technology, 41, pp. 241-254, 2014.
Torano, J., Torno, S., Menendez, M. & Gent, M., Auxiliary Ventilation in Mining Roadways Driven with Roadheaders: Validated CFD Modeling of Dust Behavior, Tunnelling and Underground Space Technology, 26(1), pp. 201-210, 2011.
ANSYS, Fluent Theory Guide, Release 13, ANSYS Inc, 2010.