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Effect of rock dust on explosibility of coal dust.

Authors
Richmond-JK; Liebman-I; Miller-LF
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8077, 1975 Jan; :1-34
Link
NIOSHTIC No.
10000483
Abstract
Early research on coal dust explosions by the federal Bureau of Mines and in other countries is reviewed to examine the effect of a single inhibitor, rock dust, on the explosion limits of coal dust. The parameters studied in this research included coal dust fineness, volatile content, and type of initiation. This research resulted in appropriate safety regulations in the respective countries. Also reported are the results of recent research in the experimental mine of the Bureau of Mines to investigate in detail the limits of coal dust explosions; the research used three types of coal with rock dust added as the independent variable. New experimental techniques and new criteria for defining propagation/nonpropagation were applied to the experiments. Also, a limit explosion propagation model is proposed based on the assumption of rapid devolatilization of the coal particles, with the subsequent combustion of the evolved volatile products contributing primarily to the propagation of the explosions. The model assumes also that the resultant char acts mainly as an inert diluent similar to the rock dust. The model also suggests that the function of stronger initiation is mostly to lift more dust from the mine surfaces.
Keywords
Coal-mining; Underground-mining; Coal-dust; Dusts; Explosion-prevention
Publication Date
19750101
Document Type
IH; Report of Investigations
Fiscal Year
1975
NTIS Accession No.
PB-247223
NTIS Price
A04
Identifying No.
RI-8077
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8077
State
PA
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