Problem of Pulverized Coal Formation at Mine Outburst Caused by Decomposition of Gas Hydrates in Coal Seams (300,00 руб.)

F. Gorbachev Kuzbass State Technical University, Kemerovo, Russia E-mail: smirnovvg@mail.ru 2Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 3Institute of Coal Chemistry and Material Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia Abstract The decomposition of methane hydrates in coal seams can be one of the causes of the origination of sudden emissions of coal and gas (coal outburst). <...> The formation possibility of methane hydrate in the inner space of natural coal of several types was experimentally studied in the work. <...> Experimental P–T diagrams for a closed system containing wet coal and free methane, demonstrate the peak methane emission into the gas phase when intersecting the curve of the equilibrium of gas hydrates. <...> Less than half of water, sorbed by coal is involved in the formation of gas hydrates. <...> It was shown for the first time that with the degree decrease of metamorphism of coal, the amount of water that is absorbed by natural coal is increased, however herewith; a proportion of water involved in the formation of methane hydrate is decreased. <...> Key words: coal, methane, hydrates, sorption, desorption, P–T diagram, sudden emissions of coal and gas 499 INTRODUCTION At the underground bituminous coal extraction, the equilibrium state of a complex system containing solid, liquid, gaseous components and being for a long time under the impact of the mechanical rock pressure is disturbed. <...> The disruption of equilibrium of a coal seam may be the cause of the emergence of dangerous gas-dynamic phenomena caused by the action of rock pressure and methane of coal seams [1–5]. <...> Coal mines are a potential source of emissions into the atmosphere of methane, light hydrocarbon gases, polyaromatic compounds and fine coal dust. <...> Fossil bituminous coal is a natural hydrocarbon polymer, which was formed from vegetable deposits, in the aqueous, airless environment of ancient swamps covered in subsequent geological periods by the layers of sedimentary rocks and minerals [3, 6, 7]. <...> At early stages of metamorphism from vegetable depositions, carbon dioxide and methane are evolved in approximately equal proportions, at the middle and late stages, methane and a small <...>