Study on the Applicability of Supercritical Methane Adsorption Model for Anthracite Coal
Taking anthracite from Zhaozhuang Coal Mine as the research object,methane isothermal adsorption experiments were carried out at four different temperatures.Langmuir,DR,and DA models were used to fit the adsorption data,and the fitting effects of each model were analyzed based on standard deviation.The results show that the effect of direct fitting is better than that of indirect fitting for Langmuir equation.For DR And DA models,the virtual saturated vapor pressure is introduced,and 5 calculation methods of virtual saturated vapor pressure are compared,Amankwah method is the most suitable.On the whole,the DR and DA models based on micropore filling theory can better describe the adsorption behavior of methane in anthracite than the Langmuir equation based on monolayer adsorption theory,and the DA-Amankwah and DR-Amankwah methods have the best fitting effect.The fitting degree of Langmuir,DR And DA models in each pressure segment shows roughly the same rule.The fitting degree in the low pressure region is the highest,the fitting curve is roughly coincident with the measured data,and the fitting adsorption amount in the middle pressure region is less than the measured adsorption amount.The fitted adsorption capacity in the high pressure region is greater than the measured adsorption capacity.The virtual saturated vapor pressure and temperature are important factors affecting the fitted saturated adsorption capacity.The higher the virtual saturated vapor pressure,the larger the fitted saturated adsorption capacity,and the higher the temperature,the lower the fitted saturated adsorption capacity.
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