Physical Simulation of Temperature Influence on Methane Sorption and Kinetics in Coal (II): Temperature Evolvement during Methane Adsorption in Coal Measurement and Modeling

Abstract

The dynamic thermal process for methane sorption in coal has not been quantitatively studied, and the temperature change induced by the heat of adsorption on the sorption equilibrium state has not been confirmed by tests. In order to probe the temperature evolvement and its effect on methane adsorption in coal, the temperature of the coal sample is measured using a digital temperature gauge during methane isothermal adsorption in coal. Isothermal adsorption tests for methane in coal under six different temperatures (50, 40, 30, −10, −20, and −30 °C) are conducted. Blind experiments show that the temperature increase of the tested coal sample induced by external energy brought via the filled methane and the possible Joule–Thomson effect is within 0.5 °C in this test and thus will not be considered during methane adsorption in coal. Both real test and modeling results show that the temperature of the coal sample induced by the heat of adsorption can go up to 13.79 °C during the methane adsorption process in...