Mining Publication: Analysis and Prediction of Longwall Methane Emissions: A Case Study in the Pocahontas No. 3 Coalbed, VA
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Original creation date: February 1997
Increasing longwall panel dimensions, particularly face width in gassy coalbeds, may result in unexpected increases in methane emissions. To investigate this problem, continuous longwall face emission monitoring studies were conducted at two adjacent mines operating in the Pocahontas No. 3 Coalbed, where longwall faces were to be extended from 229 to 305 m (750 to 1,000 ft). It was predicted by regression analysis of methane emissions data from 229 m (750 ft) wide longwall faces that extending faces to 305 m (1,000 ft) would increase methane emission rates by only 7 percent (0.6 m3/min (20 cfm)), to 8.6 m3/min (304 cfm) at the VP-1 Mine. In contrast, it was predicted that extending faces at the VP-3 Mine could increase methane emissions by as much as 13 percent (1.8 m3/min (65 cfm)) to 16.1 m3/min (567 cfm). The geologic and mine design factors influencing the variation in face emissions between the two mines will be discussed.
Authors: WP Diamond, F Garcia, GN Aul, RE Ray
Conference Paper - February 1997
NIOSHTIC2 Number: 20027792
Proceedings of the 6th International Mine Ventilation Congress (May 17-22, 1997, Pittsburgh, Pennsylvania). Chapter 35, Ramani RV, ed., Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 1997 Feb; :223-229
See Also
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- Critical Review of Numerical Stress Analysis Tools for Deep Coal Longwall Panels Under Strong Strata
- Deep Coal Longwall Panel Design for Strong Strata: The Influence of Software Choice on Results
- Development and Application of Reservoir Models for the Evaluation and Optimization of Longwall Methane Control Systems
- Development of Numerical Models to Investigate Permeability Changes and Gas Emission around Longwall Mining Panel
- Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
- Evaluation of the Relative Importance of Coalbed Reservoir Parameters for Prediction of Methane Inflow Rates During Mining of Longwall Development Entries
- Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
- Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes
- Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
- Page last reviewed: 9/21/2012
- Page last updated: 9/21/2012
- Content source: National Institute for Occupational Safety and Health, Mining Program