Mining or in situ disintegration of hard material – Processes – Mine safety
Patent
1992-12-21
1993-12-28
Bagnell, David J.
Mining or in situ disintegration of hard material
Processes
Mine safety
175 71, E21F 500
Patent
active
052733440
ABSTRACT:
A process of inerting the coal mine site formed by a coal cutting auger or continuous miner at a coal face to supress methane/coal dust explosion includes introducing an inert gas such as waste gases of combustion or nitrogen, for example, to a site downstream of the coal face in a sufficiently great volume to always replace the volume of coal carried from the coal face by a conveyor. The flow of coal by the conveyor is used to form the impetus to move inert gas from the introduction site to the coal face. The volume of inert gas at the introduction site is maintained sufficient to inhibit ingress of oxygen bearing atmospheric air to the coal face. A leaky seal may be used at the entrance to the coal face at the mining site. The inert gas may be introduced by a conduit arranged part way in the coal seam to form a separate duct extending in the coal seam to the mined cavity or by a duct formed as in integral part of the coal conveyor.
REFERENCES:
patent: 4842444 (1989-06-01), Cowan
Petroleum Engineer, "Drilling with Engine Exhaust Gases", Charles B. Erbe, pp. B46-B52, Aug. 1955.
Petroleum Engineer, "Drilling with Air", Earl R. Bruno, pp. B21-B24, Jan. 1956.
Feasibility Study of Mining Coal in an Oxygen Free Atmosphere, by Island Creek Coal Company, Aug. 1970.
McCullough Michael T.
Volkwein Jon C.
Bagnell David J.
Poff Clifford A.
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