Optimization of the Unducted Auxiliary Ventilation for Large-Opening Underground Limestone Mines
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This paper aims at optimizing the auxiliary ventilation system in large-opening limestone mines with unducted fans. An extensive CFD and also site study were carried out for optimization at the blind entries. The fan location, operating mode, and layout are the parameters for optimization. Since the jet stream discharged from the auxiliary fan is flowing faster than 15 m/s in most of the cases, the stream collides with floor, sides or roof and even with the jet stream generated from the other fan placed upstream. Then, it is likely to lose a large portion of its inertial force and then its ventilation efficiency drops considerably. Therefore, the optimal fan installation interval is defined in this study as an interval that maximizes the uninterrupted flowing distance of the jet stream, while the cross-sectional installation location can be optimized to minimize the energy loss due to possible collision with the entry sides. Consequently, the optimization of the fan location will improve ventilation efficiency and subsequently the energy cost. A number of different three-dimensional computational domains representing a full-scale underground space were developed for the CFD study. The velocity profiles and the CO concentrations were studied to design and optimize the auxiliary ventilation system without duct and at the same time mine site experiments were carried out for comparison purposes. The ultimate goal is to optimize the auxiliary ventilation system without tubing to provide a reliable, low-cost and efficient solution to maintain the clean and safe work environment in local large-opening underground limestone mines.
Abstract
This paper aims at optimizing the auxiliary ventilation system in large-opening limestone mines with unducted fans. An extensive CFD and also site study were carried out for optimization at the blind entries. The fan location, operating mode, and layout are the parameters for optimization. Since the jet stream discharged from the auxiliary fan is flowing faster than 15 m/s in most of the cases, the stream collides with floor, sides or roof and even with the jet stream generated from the other fan placed upstream. Then, it is likely to lose a large portion of its inertial force and then its ventilation efficiency drops considerably. Therefore, the optimal fan installation interval is defined in this study as an interval that maximizes the uninterrupted flowing distance of the jet stream, while the cross-sectional installation location can be optimized to minimize the energy loss due to possible collision with the entry sides. Consequently, the optimization of the fan location will improve ventilation efficiency and subsequently the energy cost. A number of different three-dimensional computational domains representing a full-scale underground space were developed for the CFD study. The velocity profiles and the CO concentrations were studied to design and optimize the auxiliary ventilation system without duct and at the same time mine site experiments were carried out for comparison purposes. The ultimate goal is to optimize the auxiliary ventilation system without tubing to provide a reliable, low-cost and efficient solution to maintain the clean and safe work environment in local large-opening underground limestone mines.
참고문헌 (25)
- ANSYS, Inc., "FLUENT User’s Guide, Version 17.0" (2019), ANSYS, Inc
- Colella, F., "Multiscale modeling of transient flows from fire and ventilation in long tunnels", Comput. Fluids, 51, pp.16~29 (2011)
- Dunn M, "Auxiliary Jet Fans and How to Get the Most Out of Them for Ventilating Large Room-And-Pillar Mines", Engineering Mining Journal, pp.31~34 (1983)
- Gao, J., "Simulation of thermal environmental conditions in heading face with forcing auxiliary ventilation-control of thermal environmental conditions in locally ventilated working place (1st report)", Min. Mater. Process. Inst. Jpn, 118, pp.9~16 (2002)
- Gosman, A., "Developments in CFD for industrial and environmental applications in wind engineering", J. Wind Eng. Ind. Aerod, 81, pp.21~39 (1999)
- Grau III, R. H., "Maximizing the ventilation of large-opening mines", Proceedings of the 11th US, 2006, 53~59[DOI]
- Grau III, R. H., "Practical techniques to improve the air quality in underground stone mines", In the North American, 2002, 123~129
- Graul III, R. H., "Using mine planning and other techniques to improve ventilation in large-opening mines", Mining Engineering, 61(2), pp.46~ (2009)
- Analysis of a ventilation network in a multiple fans limestone mine, "Haghighat, A.", Missouri University of Science and Technology, ~ (2014)
- Hargreaves, D., "The computational modeling of the ventilation flows within a rapid development drivage", Tunn. Undergr. Sp. Tech, 22, pp.150~160 (2007)
- Hartman, H. L., "Introductory Mining Engineering" (2002), John Wiley & Sons Inc.
- Huang, Yuandong, "A numerical study of airflow and pollutant dispersion inside an urban street canyon containing an elevated expressway", Environmental Modeling & Assessment, 18(1), pp.105~114 (2013)
- Krog, R., "Fan selection for large-opening mines: vane-axial or propeller fans-which to choose?", Proceedings of 11th US, In North American Mine Ventilation Symposium, pp.527~534 (2006)
- 이창우, "Development of a Low Pressure Auxiliary Fan for Local Large-opening Limestone Mines", 터널과 지하공간, 25(6), pp.543~555 (2015), 한국암반공학회
- Migoya, E., "A simplified model of fires in road tunnels. Comparison with three-dimensional models and full-scale measurements", Tunn. Undergr. Sp. Tech, 24, pp.37~52 (2009)
- Montazeri, H., "Experimental and numerical study on natural ventilation performance of various multi-opening wind catchers", Build. Environ, 46, pp.370~378 (2011)
- Parra, M., "Numerical and experimental analysis of different ventilation systems in deep mines", Build. Environ, 41, pp.87~93 (2006)
- Concentration Measurements with Different Roof Patterns in Street Canyon with Aspect Ratios B, "H¼1", 2 and B, Rafailidis, S., pp.Universität Hamburg, Meterologisches Institute, 1995[DOI]
- "Road design guidelines, chapter 6", Ministry of Land, Infrastructure and Transport, Republic of Korea, ~ (2010)
- Silvester, Stephen, "The integration of CFD and VR methods to assist auxiliary ventilation practice", Ph.D., pp.2002
- Toraño, J., "Models of methane behaviour in auxiliary ventilation of underground coal mining", Int. J. Coal Geol, 80, pp.35~43 (2009)
- Torno, S., "Conventional and numerical models of blasting gas behaviour in auxiliary ventilation of mining headings", Tunn. Undergr. Sp. Tech, 34, pp.73~81 (2013)
- Wallace K. G., "General Operational Characteristics and Industry Practices of Mine Ventilation Systems", Proceedings of the 7th International Mine Ventilation 149 Congress, pp.229~234 (2001), Research and Development Centre for Electrical Engineering and Automation in Mining
- Diesel Particulate Matter Dispersion Analysis in Underground Metal, "Nonmetal Mines Using Computational Fluid Dynamics", Zheng, Y., 2011
- Zhongwei, W., "Investigation of airflow and respirable dust flow behaviour above an underground bin", Powder Technol, 250, pp.103~114 (2013)