Adsorption Respondence of Different Coal Body Structures and Its Influence Mechanism

In order to study the difference and its controlling mechanism of gas adsorption on coals with different body structures, such parameters as the macroscopic petrographic constituents, the adsorption capacity and pore structure of undeformed and mylonitic coal samples of Jiaozuo coalfield, were measured. The experimental results show that the mylonitic coal is of higher ability of absorption and desorption than that of the undeformed coal. With the rising of temperature, the mylonitic coal is more evident than undeformed coal in the tendency of decline in absorption and increase in desorption. The study concludes that the pores in different pore diameter increases after the coal body is deformed, so the gas-containing capacity of mylonitic coals is stronger. Especially, the contents of macroand meso-pore are higher in mylonitic coals, so the desorption becomes easier. Moreover, other factors, including the coal rank rise, the vitrinite content increase and inertinite content decrease after the coal body is deformed, lead to the increase of absorption ability. The study also concludes that the ash content is not the main controlling factor on the adsorption difference between two types of coals with different coal body structures.