FIELD: mining; coal industry.
SUBSTANCE: method for determining mine methane resources at an excavation site includes measuring parameters of a coal rock mass, determining the methane content of coal seams, the flow rate of captured methane, air flow and methane content in it. Additionally, reserves and technological losses of coal in the excavation area of the mined seam are determined. The natural methane content of coal seams and, additionally, the degree of degassing of coal seams subject to unloading from rock pressure in the formation, both in the roof and in the soil of the developed seam, are determined by taking coal samples at the site using core gas samplers, followed by determining the methane content in the selected coal core. The angles of unloading of roof rocks and soil from the side sectional workings during mining of the developed seam are identified. Limit zones for unloading roof rocks and soil are determined by the intensity of methane release from adjacent coal seams into degassing wells. Methane resources at the excavation site are determined taking into account the coal reserves in the formation of the coal-bearing strata outlined by the discharge planes. The methane resources of the developed seam are determined by coal reserves and the difference between the natural methane content of the seam and the residual methane content of broken coal at the exit from the transport workings of the excavation site. The intensity of methane release in the workings during the destruction of coal by a combine and its background release from the exposed surfaces of the mined seam and mined-out space are measured. Coal mine methane resources are determined by the volume of its release in the workings and degassing networks of the site during the period of cleanup work on it. The background emission of methane is determined in the intervals between the next timing intervals of the combine operation based on the destruction of coal, readings from methane concentration and air flow sensors.
EFFECT: increasing the accuracy of determining coal mine methane resources.
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