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Numerical study on effects of coal properties on spontaneous heating in longwall gob areas.

Authors
Yuan-L; Smith-AC
Source
Fuel 2008 Nov; 87(15-16):3409-3419
NIOSHTIC No.
20034340
Abstract
A computational fluid dynamics (CFD) study was conducted to model effects of coal properties on the potential for spontaneous heating in longwall gob (mined-out) areas. A two longwall panel district using a bleeder ventilation system was simulated. The permeability and porosity profiles for the longwall gob were generated from a geotechnical model and were used as inputs for the three-dimensional CFD modeling. 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. Heat generated from coal oxidation is dissipated by convection and conduction, while oxygen and oxidation products are transported by convection and diffusion. Unsteady state simulations were conducted for three different US coals and simulation results were compared with some available test results. The effects of coal surface area and heat of reaction on the spontaneous heating process were also examined.
Keywords
Mining-industry; Underground-mining; Coal-mining; Spontaneous-combustion; Longwall-mining; Models; Mathematical-models; Computer-models
Contact
Liming Yuan, Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, P.O. Box 18070, Cochrans Mill Road, Pittsburgh, PA 15236, United States
CODEN
FUELAC
Publication Date
20081101
Document Type
Journal Article
Email Address
Lcy6@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
15-16
ISSN
0016-2361
NIOSH Division
PRL
Priority Area
Mining
Source Name
Fuel
State
PA
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