Study on the Mechanism of Catalytic Oxidation of Ventilation Air Methane by Different Thermal Coals

In addition to methane from agricultural production, water bodies, and soil, ventilation air methane (VAM) is a source of greenhouse gas methane, and ultra-low concentrations of methane can be converted by coal-fired boilers. By comparing the ignition temperatures, the experimental phenomenon of the reaction temperatures of different coal types during the heating process of mixed combustion of methane: anthracite > bituminous coal > lignite was obtained, and the intrinsic mechanism of coal combustion of methane was investigated in terms of heat and surface catalytic by using quantum chemical calculations - the heat released from the combustion of coal is much larger than that needed to trigger the methane combustion chain reaction, and the gas oxygen is changed to gas oxygen by chemical adsorption with coal through charge transfer. The heat released by coal combustion is much larger than the heat required to initiate the methane combustion chain reaction, and the charge transfer between oxygen and coal through chemisorption changes the gas oxygen into adsorbed oxygen, which is easier to combine with methane. The study shows that in the process of coal-VAM mixing and burning, the plasma combustion mechanism, thermal effect, and catalytic oxidation of coal synergistically promote the VAM combustion, which provides a theoretical basis for the better utilization of ventilation air methane.