CO adsorption-diffusion model in coal seams

Through the adsorption experiment for CO at different temperatures and different pressures, we get a result showing that, at a normal temperature, adsorption isotherms of CO in coal seams is part of class Iadsorption isotherm. The CO adsorption quantity can be calculated by the Langmuir equation. Diffusion mode of gas in coal seam is determined by the index Kn, which determines the magnitude of coal hole diameter and average free moving distance of molecules. According to the calculation value of Kn, it is confirmed that diffusion modes of CO in coal seams are mainly Knudsen style and transition type diffusion. The samples of coal are mainly in the bituminous coal of low metamorphic grade, and the coal hole structure is mainly pore and transition hole. Therefore, in the coal seams, the proliferation transition model of proliferation of CO is mainly the Knudsen proliferation.