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Mishra, Devi Prasad
- Numerical Studies of Ventilation Effect on Methane Layering Behaviour in Underground Coal Mines
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PDF Views:101
Authors
Affiliations
1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
Source
Current Science, Vol 112, No 09 (2017), Pagination: 1873-1881Abstract
Layering of methane in underground coal mines owing to poor ventilation leads to methane explosion hazard. We study the methane layering phenomenon and the effect of ventilation on dispersion of methane in underground coal mines at air velocities varying from 0.5 to 4.0 m/s. Three-dimensional simulations using CFD code ANSYS Fluent 12.0 were performed assuming the flow to be unsteady, turbulent and incompressible. The study demonstrated that ventilation significantly affects the behaviour of methane layering and dispersion of methane in underground coal mines. The layering length decreased with increase in air velocity. At air velocity of 4.0 m/s, the methane layering length considerably reduced to a safer level of about 1 m. Moreover, the simulation results showed a good agreement with the experimental results.Keywords
Methane Layering, Numerical Simulation, Underground Coal Mine, Ventilation Effect.Full Text
References
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Abstract Views :189 |
PDF Views:111
Authors
Affiliations
1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
Source
Current Science, Vol 122, No 4 (2022), Pagination: 419-428Abstract
Dispersing coal dust to a safe level near the mining face is of utmost importance for maintaining a safe and healthy workplace environment in any mine. The huge amount of coal dust generated during coal winning near a mine development heading is generally dispersed through auxiliary ventilation systems. In this study, dispersion of coal dust in a continuous miner development heading was analysed with five different auxiliary ventilation systems through computational fluid dynamics simulations, and their efficacy of dust dispersal to a safe level was compared. The dust concentration in the heading developed by continuous miner was monitored by a Grimm aerosol spectrometer. The k–e turbulence model was used to perform 3D computational simulations utilizing real mine data. This study provided an insight into the dispersion behaviour of coal dust in the development heading with diverse auxiliary ventilation systems. The line brattice system proved to be the most effective means of dust dispersion. Nonetheless, better dispersion of coal dust in the development heading was achieved at line brattice distances of 0.75 and 1.0 m from the side wall.Keywords
Auxiliary ventilation systems, coal dust, computational simulation, development headings, dispersion, line brattice, underground coal mines.Full Text
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