Microscopic Mechanism of Adsorption-Desorption in Coal and Gas Outburst Process

In order to solve induced source of coal and gas outburst and excessive gas source during outburst, based on the density functional theory (DFT) methods and the quantum mechanics theory, in this paper the mechanism of coal and gas adsorption and desorption in microcosmic level is studied by means of the quantum chemical calculation method and the electromagnetic wave. By constructing an adsorption and desorption model, coal and gas adsorption energy and desorption critical frequency is found. Using Fourier transform infrared analysis method, and by infrared spectrum experiment research of ultrafine coal powder and the molecular structure of coal in outburst coal, the basic reason that the number of groups of ultrafine pulverized coal is far less than that of lump coal is abruption of organic macromolecular side chain groups and the release of low molecular compounds. Thus, the source of excessive gas is revealed during the outburst and the microscopic mechanism of coal and outburst is proposed.