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Quenching Methane-air Ignitions With Water Sprays.

Authors
Sapko-MJ; Furno-AL; Kuchta-JM
Source
NTIS#: PB 266 727 :13 pages
Link
NIOSHTIC No.
10000487
Abstract
The Bureau of Mines conducted laboratory-scale flammability experiments to investigate the possible use of water spray systems for inerting or quenching mine-gas ignitions, such as those encountered at the working face of a coal mine. The inerting results for premixed methane-air-water mixtures indicated that water droplets of less than 10 um tend to be as effective as the vapor. Water requirements for inerting such mixtures were much smaller than those for quenching the sustained flame propagation by the application of water sprays. The minimum water mass concentration for quenching methane-air flames increased linearly with increasing droplet diameter (surface weighted mean) and decreased with increasing spray temperature, whereas the droplet surface area required per unit volume was essentially constant for a given gas mixture composition. Data extrapolations indicated that a quenching system may be feasible for the longwall mining application.
Publication Date
19770101
Document Type
IH; Report of Investigations
Fiscal Year
1977
NTIS Accession No.
PB-266727
NTIS Price
A03
Identifying No.
RI 8214
NIOSH Division
PRC;
Source Name
NTIS#: PB 266 727
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