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Rapid sampling of products during coal mine explosions.

Authors
Conti-RS; Zlochower-IA; Sapko-MJ
Source
Combust Sci and Technol 1991 Feb; 75(4-6):195-209
NIOSHTIC No.
20032361
Abstract
This paper describes a U.S. Bureau of Mines investigation of large-scale coal dust explosions in an experimental mine using a high speed electropneumatic mechanism for the rapid grab-sampling of gases and dusts. This technique enables the monitoring of pyrolysis and charring in fuel dust particles, and the collection of gaseous combustion products, in both large and small-scale explosions. Data obtained from full-scale dust explosion tests at the Bureau of Mines Lake Lynn Test facility show the following: Rapid sampling appears to "freeze" the burned gas compositions at the flame temperature values. Gas samples taken entirely in the flame zone consist of pyrolysis and combustion products with very low residual oxygen. The particles collected in the flame zone show signs of extensive pyrolysis and charring. Measurements of gas concentrations and particle flame temperatures suggest that char burning may have occurred in the flame zone.
Keywords
Mining-industry; Mine-fires; Mine-disasters; Explosions; Coal-mining; Sampling-methods; Sampling-equipment; Dust-explosions; Combustion-products
Contact
Pittsburgh Research Center, Bureau of Mines, U.S. Department of the Interior, Pittsburgh, PA, 15236
CODEN
CBSTB9
Publication Date
19910201
Document Type
Journal Article
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Issue of Publication
4-6
ISSN
0010-2202
NIOSH Division
PRC
Source Name
Combustion Science and Technology
State
PA
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