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The National Institute for Occupational Safety and Health (NIOSH) has been conducting research at a Pittsburgh Coalbed longwall mine to evaluate and optimize bleeder ventilation and gob gas venthole longwall methane control systems. Gas flow into these two methane control systems was investigated using a combination of Sulphur Hexafluoride (SF6) tracer gas studies and gob venthole pressure monitoring experiments. The insights gained from this research has facilitated the development of a longwall subsided starta methane control system conceptual model. This model provides the basis for design suggestions to increase the efficiency of the gob gas venthole system to permit the bleeder ventilation system to become a "safety net" for methane control.
| Author(s): | Mucho-TP, Diamond-WP, Garcia-F, Byars-JD, Cario-SL |
| Reference: | SME Annual Meeting, 2000 Feb 25 - Mar 1, Salt Lake City, Utah, SME Preprint No. 00-8, Littleton, CO, 2005; :1-17 |
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