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Impact of Air Velocity on the Development and Detection of Small Coal Fires.


PB94112364

Publication Date 1993
Personal Author Egan, M. R.
Page Count 24
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
  • Mine fires
  • Coal mines
  • Air infiltration
  • Fire tests
  • Smoke
  • Combustion products
  • Ventilation
  • Mine safety
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 94H - Industrial Safety Engineering
  • 81A - Combustion & Ignition
Corporate Authors Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Supplemental Notes Library of Congress catalog card no. 93-28787.
Document Type Technical Report
Title Note Rept. of investigations/1993.
NTIS Issue Number 199403
Impact of Air Velocity on the Development and Detection of Small Coal Fires.
Impact of Air Velocity on the Development and Detection of Small Coal Fires.
PB94112364

  • Mine fires
  • Coal mines
  • Air infiltration
  • Fire tests
  • Smoke
  • Combustion products
  • Ventilation
  • Mine safety
  • Bureau of Mines
  • 48A - Mineral Industries
  • 94H - Industrial Safety Engineering
  • 81A - Combustion & Ignition
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