Abstract
The capacity of coal to adsorb methane is greatly affected by temperature and, in recent years, temperature-dependent adsorption has been studied by many researchers. Even so, comprehensive conclusions have not been reached and conflicting experimental results are common. This paper reviews the current state of research regarding the temperature-dependent adsorption of methane in coal and catalogs the conclusions from experiments conducted on that subject by 28 researchers, as published between 1995 and 2017. Probability theory and statistics are used to show that the conclusion generally accepted by most researchers is that the amount of methane adsorbed by coal decreases with increasing temperature. It is highly likely that the Langmuir volume decreases as the temperature rises, and it is also probable that the Langmuir pressure increases at higher temperatures. Equations are presented that express the relationships between methane adsorption, Langmuir volume, Langmuir pressure, and temperature. Future research should be directed toward determining the relationship between Langmuir pressure and temperature. The results of the study presented herein provide a theoretical basis for predicting the gas content in coal seams and improving the efficiency of coalbed methane development.
Highlights
Coal mine methane (CMM) adsorption is an important topic associated with the study of coal gas outbursts, and is relevant to the exploration, development, and utilization of coalbed methane
Coalbed and shale methane reservoirs have become an important source of natural gas, and a significant proportion of the gas in these reservoirs exists in an adsorbed state
The aim of this work was to determine the overall effect of temperature on methane adsorption, to point out shortcomings in current experimental procedures, and to propose improvements that will make experiments performed in different laboratories easier to compare
Summary
Coal mine methane (CMM) adsorption is an important topic associated with the study of coal gas outbursts, and is relevant to the exploration, development, and utilization of coalbed methane. Increasing the internal energy of the CMM accelerates gas adsorption and diffusion This thermal effect can be produced by hot-water injection, flue gas injection, water jetting, an electromagnetic field, or ultrasonic vibrations (Ge et al, 2011; He, 1996; He et al, 2010; Li et al, 2011; Yang et al, 2008, 2010, 2013). For all of these techniques, the effect of temperature on gas adsorption and diffusion should be considered. The combination of reservoir temperature and pressure determines the phase of the stored CO2 (gas, liquid, or supercritical fluid) as well as the capacity of the storage reservoir (Gensterblum et al, 2014; Sakurovs et al, 2008)
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