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THE INVESTIGATION OF COAL FRACTURING BY HIGH-ENERGY SOLID FUEL IN LABORATORY SCALE
Abstract
The coal samples were fractured by using high-energy solid fuel (propellants) in the lab rocket motor (LRM) adapted to investigate the impact of propellant gases pressure on rocks. The combustion of the propellant generates large quantities of gases at high pressure, which are able to produce a secondary system of fractures in the coal - potential pathways for methane migration. Values of pressure and time generated during combustion of propellants in the standard system of a laboratory rocket motor are controlled by proper selection of fuel weight and diameter of the nozzle. During the tests, the nozzle was replaced with a coal cylinder samples, which were directly affected by the pressure of powder gases in the sealed combustion chamber in the test system. During each fracturing test pressure was recorded by a pressure sensor placed in the combustion chamber in LRM. Additionally, to assess the effectiveness of fracturing, coal samples were scanned by X-ray computed tomography (CT) before and after the fireground tests. The obtained roentgenograms were processed using specialized computer software for 3D images of primary and secondary fractures in coal samples.
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