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Computational fluid dynamics modeling of spontaneous heating in longwall gob areas.

Authors
Yuan-L; Smith-A
Source
Trans Soc Min Metal Explor 2007 Dec; 322:37-44
NIOSHTIC No.
20033070
Abstract
To provide insights for the optimization of ventilation systems for U.S. underground coal mines facing both methane control and spontaneous combustion issues, a computational fluid dynamics (CFD) study was conducted to model the potential for spontaneous heating in longwall gob areas. A two longwall panel district using a bleeder ventilation system with a stationary longwall face was simulated. The permeability and porosity profiles for the longwall gob were generated from a geotechnical model and were used as inputs for the CFD modeling. In this study, the effect of methane emissions from the mined coal seam, including the longwall face and overlying rider seam reservoirs on the gob gas distribution was considered. The spontaneous heating is modeled as the low-temperature oxidation of coal in the gob using kinetic data obtained from previous laboratory-scale spontaneous-combustion studies. Unsteady state simulations were conducted, and the effects of the coal's apparent activation energy and reaction surface area on the spontaneous heating process were also examined.
Keywords
Mining-industry; Underground-mining; Coal-mining; Methanes; Methane-control; Methane-drainage; Longwall-mining; Models; Computer-models; Ventilation-systems
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
TMENAE
Publication Date
20071201
Document Type
Journal Article
Editors
Yernberg-WR
Fiscal Year
2008
NTIS Accession No.
NTIS Price
ISBN No.
9780873352611
ISSN
1075-8623
NIOSH Division
PRL
Priority Area
Mining
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
PA; CO
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