Experimental study on gas adsorption characteristics of coals under different Protodyakonov’s coefficient

Abstract

The Protodyakonov’s coefficient of coal samples is a key factor affecting coal and gas outburst, so studying the gas adsorption pattern of coal samples with different Protodyakonov’s coefficients can effectively prevent coal and gas burst accidents. In order to study the influence of Protodyakonov’s coefficient on gas adsorption characteristics of coal, seven groups of coal samples with different Protodyakonov’s coefficients were selected for this study. Gas adsorption characteristics of coal bodies were investigated using gas adsorption tests with HCA high pressure adsorption devices. The gas adsorption properties of coal with different Protodyakonov’s coefficients were obtained and the effect of adsorption temperature and pressure on the gas adsorption properties were analyzed and further explored in depth. The results showed that the adsorption constant a showed an overall decreasing trend with the increase of the Protodyakonov’s coefficient. At constant temperature (30°C, 40°C, 50°C), the adsorption amount increased with the increase of relative pressure, and the increase was negatively correlated with the value of f. At constant pressure, the adsorption amount by and the adsorption constant a gradually decreased with the increase of temperature, and the adsorption constant decreased with the increase of temperature for the same coal sample under different temperature conditions. The results provide a theoretical basis for the prevention as well as the control of coal and gas burst accidents.