Co-utilization of two coal mine residues: Non-catalytic deoxygenation of coal mine methane over coal gangue |
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| Institution: | 1. Nuclear Engineering Department, Technical University of Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain;2. Modeling and Simulation Department, Nuclear Safety Council (MOSI CSN), Justo Dorado 11, 28040 Madrid, Spain;1. NACHI-FUJIKOSHI CORP, 3-1-1 Yoneda-machi, Toyama 931-8511, Japan;2. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan;1. Boreskov Insitute of Catalysis, Novosibirsk, 630090, Russia;2. Institute of Coal Chemistry and Material Science, Kemerovo, 650000, Russia;3. Novosibirsk State University, Novosibirsk, 630090, Russia |
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| Abstract: | The deoxygenation of coal mine methane (CMM) is a necessary process for concentrating methane by pressure-swing adsorption technology. Removal of oxygen in CMM by the reaction between oxygen and carbon in coal gangue is a novel solution for simultaneously utilizing two kinds of byproducts of coal mine, CMM and coal gangue. Process conditions for the deoxygenation of CMM were investigated systematically by using a fixed-bed reactor. The results show that higher temperature and lower gas flow rate not only decreased the residual oxygen concentration in the outlet gas but also increased the methane loss, and that the particle size of gangue did not influence deoxygenation within the experimental conditions used. Under optimal conditions (650 °C and 250 mL/min), there was no residual oxygen in the outlet gas and the methane concentration decreased by less than 0.5 mol%. XRD results show that coal gangue was activated during deoxygenation, and that activated gangue was suitable for utilization as a main component in cementitious materials. |
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| Keywords: | Coal gangue Coal mine methane (CMM) Deoxygenation Compressed natural gas (CNG) Cementitious material |
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