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Impact of air velocity on the development and detection of small coal fires.

Authors
Egan-MR
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9480, 1993 Jan; :1-16
Link
NIOSHTIC No.
10004330
Abstract
The U.S. Bureau of Mines conducted experiments in the intermediate-scale fire tunnel to assess the influence of air velocity on the gas production and smoke characteristics during smoldering and flaming combustion of Pittsburgh seam coal and its impact on the detection of the combustion products. On-line determinations of mass and number of smoke particles, light transmission, and various gas concentrations were made. From these experimental values, generation rates, heat-release rates, production constants, particle sizes, obscuration rates, and optical densities were calculated. Ventilation has a direct effect on fire detection and development. The results indicate that, in general, increased air velocity lengthened the onset of smoke and flaming ignition, increased the fire intensity, but decreased the gas and smoke concentrations. Increased air velocity also lengthened the response times of all the fire sensors tested. Rapid and reliable detector response at this most crucial state of fire development can increase the possibility that appropriate miner response (fire suppression tactics or evacuation) can be completed before toxic smoke spreads throughout the mine.
Keywords
Fire-tests; Smoke; Combustion-products; Ventilation; Mine-safety; Mine-fires; Coal-mines; Air-infiltration; Mining-industry; Underground-mining; Ventilation-systems
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB94-112364
NTIS Price
A03
Identifying No.
RI-9480
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9480
State
PA
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