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Carbon monoxide dispersion from a coal fire in a mine entry.

Authors
Edwards-JC; Franks-RA; Friel-GF; Yuan-L
Source
Proceedings of the 11th U.S./North American Mine Ventilation Symposium, University Park, Pennsylvania, June 5-7, 2006. Mutmansky JM, Ramani RV. eds., London, U.K.: Taylor & Francis Group, 2006 Jun; :511-517
Link
NIOSHTIC No.
20030334
Abstract
Five mine fire experiments were conducted in a 2.08-m-high, 2.90-m-wide ventilated mine entry in NIOSH's Safety Research Coal Mine to determine the effect of the dispersion of carbon monoxide (CO) on mine fire detection. CO measurements were made at distances from 7.6 to 45.2 m downwind from the fire with diffusion-mode CO sensors positioned near the roof. For small-intensity fires, less than 30-kW heat release rate, generated by 14-kg coal in a 0.61-m square tray, it was determined that airflow and sensor spacing were significant for fire detection at the 10-ppm CO alarm level. Within 15.0 m downwind distance from the fire, 10-ppm CO alarm values occurred for volumetric airflows less than 11.5 cubic meters/sec. However, the 10-ppm CO alarm value did not occur 30.0 m downwind from the fire for air quantities greater than 6.2 cubic meters/sec due to dilutive mixing of the CO in the airstream. The criterion that the mine fire alarms occur within 15 min of the onset of flaming combustion could not be consistently met with the 10-ppm CO alarm. This suggests the use of lower CO alarm values or reduced CO sensor spacings for mine fire protection. It is demonstrated how computational fluid dynamics (CFD) can be used to model the CO dispersion downwind from the fire in support of a plan to optimize sensor spacings.
Keywords
Mining-industry; Underground-mining; Coal-mining; Mine-fires; Safety-research; Hazards
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CAS No.
630-08-0
Publication Date
20060605
Document Type
Conference/Symposia Proceedings
Editors
Mutmansky-JM; Ramani-RV
Fiscal Year
2006
NTIS Accession No.
NTIS Price
ISBN No.
0415401488
NIOSH Division
PRL
Source Name
Proceedings of the 11th U.S./North American Mine Ventilation Symposium, University Park, Pennsylvania, June 5-7, 2006
State
PA
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