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Analysis of post-explosion residues for estimating flame travel during coal dust deflagrations.

Authors
Man-C-K; Harris-ML; Weiss-ES
Source
Sci Technol Energ Mater 2011 Oct-Nov; 72(5):136-140
NIOSHTIC No.
20040046
Abstract
Fine coal particles are produced in underground coal mines during the mining process. These particles can cause an explosion if they are entrained and ignited. However, this type of explosion hazard in underground coal mines can be reduced by applying generous quantities of incombustible rock dust to the entries, including the roof, rib, and floor areas. The National Institute for Occupational Safety and Health (NIOSH) Office of Mine Safety and Health Research (OMSHR) has conducted a series of large-scale explosion experiments at the Lake Lynn Experimental Mine (LLEM) to investigate the inerting effect of limestone rock dust. Numerous experiments were conducted using a pulverized Pittsburgh coal dust (PPC) mixed with limestone rock dust to achieve total incombustible contents varying from 67 to 82%. These dust mixtures were entrained and were subsequently ignited, if insufficient incombustible was present, by the ignition of a methane-air zone located at the closed end of the entry. Electronic flame sensors were positioned at regular intervals along the length of the entry to measure the flame travel. Post-explosion dust residue samples were taken along the entry after each explosion and analyzed to infer flame travel by measuring the thermal decomposition of limestone rock dust. Alcohol coking indices of the post-explosion residues were also measured. The alcohol coking test method is a forensic tool currently used by the Mine Safety and Health Administration (MSHA) in accident investigations.The determination of the extent of flame travel by these different measurement methods are discussed and compared. The rock dust solubility test described in this paper could assist accident investigators in more accurately establishing the flame limits of a dust explosion.
Keywords
Coal-dust; Coal-mining; Explosive-dusts; Explosive-hazards; Microscopic-analysis; Mine-disasters; Mine-fires; Mine-gases; Nanotechnology; Particle-aerodynamics; Particulate-dust; Particulate-sampling-methods; Rock-bursts; Surface-properties; Underground-mining; Author Keywords: coal dust; explosion; rock dust; forensic
Contact
Fires and Explosions Branch, Office of Mine Safety and Health Research (OMSHR), National Institute for Occupational Safety and Health (NIOSH), 626 Cochrans Mill Road, Pittsburgh, PA 15236
CAS No.
74-82-8
Publication Date
20111001
Document Type
Journal Article
Email Address
cman@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B12212011
Issue of Publication
5
ISSN
1347-9466
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Science and Technology of Energetic Materials
State
PA
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