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Effects of ventilation and gob characteristics on spontaneous heating in longwall gob areas.

Authors
Yuan-L; Smith-AC
Source
Proceedings of the 12th U.S./North American Mine Ventilation Symposium, Reno, Nevada, June 9-11, 2008. Wallace KG Jr., ed., Reno, NV: University of Nevada - Reno, 2008 Jun; :141-147
NIOSHTIC No.
20034037
Abstract
In the U.S. coal mining industry, most spontaneous combustion fires occur in longwall or worked-out gob areas. In order to reduce the fire hazard caused by spontaneous combustion, it is important to understand how ventilation and gob characteristics affect the spontaneous heating process. Given the difficulty to conduct field tests in such an environment, a computational fluid dynamics (CFD) study was conducted to investigate the effects of ventilation and gob characteristics on the spontaneous heating process in longwall gob areas. Two longwall panels with a bleeder ventilation system were simulated. The spontaneous heating is modeled as the low temperature oxidation of coal in the gob using the Arrhenius rate law and kinetic data obtained from previous laboratory-scale studies. The heat generated from the spontaneous heating is transported by convection and conduction, and oxygen and the oxidation products are transported by convection and diffusion. Unsteady state simulations were conducted with different ventilation conditions and gob permeability distributions. The ventilation parameters varied in the simulations are the pressure at the bottom of the bleeder shaft and regulator resistance in the second entry inby the longwall face. PowerPoint and MP3 files are available.
Keywords
Mining-industry; Underground-mining; Coal-mining; Longwall-mining; Spontaneous-combustion; Mine-fires; Ventilation-systems; Ventilation; Fire-prevention; Models
Publication Date
20080609
Document Type
Conference/Symposia Proceedings
Editors
Wallace-KG Jr.
Fiscal Year
2008
NTIS Accession No.
NTIS Price
ISBN No.
9780615200095
NIOSH Division
PRL
Priority Area
Mining
Source Name
Proceedings of the 12th U.S./North American Mine Ventilation Symposium, Reno, Nevada, June 9-11, 2008
State
PA; NV
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