Abstract
To further reveal the mechanism of coal gas migration, the reasons for coal temperature changes during the methane desorption process were analyzed from the aspect of molecular motion and the thermodynamic theory. The temperature change mechanism was investigated, and the mathematical equation was established to describe the variation of temperature change during the methane desorption and diffusion process. The established equation was applied for the calculation of temperature change for two types of coal samples, and the measured and theoretical values of temperature changes were obtained. The results show that the temperature changes in the coal gas desorption process are mainly caused by the heat adsorption. The heat adsorption phenomenon was also caused by free gas expansion during the pressure relief process. The gas diffusion and work done for gas seepage also need heat adsorption. The temperature change is positively correlated to the coal gas pressure, quantity, and limit value of gas desorption volume. Due to the poor insulation in the test system, the difference between the theoretical and the measured temperature change values increase with the adsorption equilibrium pressure. It is helpful to further reveal the mechanism of coal and gas outburst. It also has an important reference value for controlling gas dynamic disasters in coal mines.
Highlights
Gas desorption is a dynamic process that changes over time. e adsorption and desorption of gas in coal is considered to be a reversible physical process that happens with thermal effects
A large number of studies showed that the coal temperature is closely related to coal gas desorption. e higher the temperature, the larger the desorption rate [1–11]
It was found that the coal gas adsorption process is an exothermic process, whereas the gas desorption process is an endothermic process. e hot-dip galvanizing high-sensitivity infrared temperature measurement technology was applied in studying the temperature change law in the process of coal gas desorption [14]
Summary
Gas desorption is a dynamic process that changes over time. e adsorption and desorption of gas in coal is considered to be a reversible physical process that happens with thermal effects. Gas desorption is a dynamic process that changes over time. A large number of studies showed that the coal temperature is closely related to coal gas desorption. Temperature changes during gas adsorption and desorption were tested using a gas outburst simulator [12, 13]. It was found that the coal gas adsorption process is an exothermic process, whereas the gas desorption process is an endothermic process. E hot-dip galvanizing high-sensitivity infrared temperature measurement technology was applied in studying the temperature change law in the process of coal gas desorption [14]. Coal and gas outburst is related to gas desorption. Studying the mechanism of temperature change during coal gas desorption is of great significance for analyzing the mechanism of energy migration and transformation in coal mining. It is helpful to further reveal the mechanism of coal and gas outburst; it has important reference value in the prevention and control of gas dynamic disasters in coal mines
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