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Methane Buildup Hazards Caused by Dust Scrubber Recirculation At Coal Mine Working Faces, a Preliminary Estimate.

Kissell FN; Bielicki RJ
NTIS: PB 240 684 :25 pages
Air recirculation caused by dust scrubbers at coal mine working faces was examined by the federal Bureau of Mines with regard to the potential hazards caused by a possible buildup of methane gas. A theoretical analysis indicated that there was no a priori way to predict the effect of scrubber recirculation on methane concentration levels. Experiments conducted in a full-scale model of a working face area indicated that methane levels were dependent to a great extent on the location of the scrubber exhaust, but that the scrubber recirculation did not substantially increase the methane concentration above those levels that would have prevailed were the scrubber not in operation. An analysis of two underground scrubber trials showed that the scrubbers had no significant effect on methane levels, and a review of explosions attributed to recirculation showed that these were characterized by a lack of fresh air as well as recirculation. It was concluded that high methane levels are due more to a lack of fresh air than to recirculation.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 8015
NIOSH Division
Source Name
NTIS: PB 240 684
Page last reviewed: November 26, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division