Journal
FUEL
Volume 255, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.115775
Keywords
Adsorption characteristics; Coalbed methane; Grand canonical Monte Carlo simulation; Pore size; Isosteric adsorption heat; Adsorption entropy
Categories
Funding
- National Natural Science Foundation of China [5173-4007, 5167-4192, 5187-4236, 5160-4220]
- Xinjiang uygur autonomous region regional collaborative innovation project [2018D14003-1, 2018E02094-1]
- College of Chemistry and Chemical Engineering of Xi'an University of Science and Technology
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The adsorption characteristics of coalbed methane have a significant influence on the adsorption properties of porous media, such as coal and shale. In this study, the adsorption capacities of methane (CH4), water (H2O), and nitrogen (N-2) isotherms in the coal slit model were calculated and discussed in detail. A series of grand canonical Monte Carlo simulations were conducted at 77.15 K and pressures of up to 100 kPa to test the effect of various pore sizes (1, 2, and 4 nm). As the breadth of the slit increased, the amount of adsorption decreased. The amount of adsorption was found to be positively related to pressure. The relationship between the adsorption amounts of the three gases was as follows: H2O > CH4 > N-2, an order consistent with the law of isosteric adsorption heat. Gas was more readily adsorbed in the micropores under low-temperature conditions. The slit width had no effect on the adsorption entropy. Moreover, the relationship between the adsorption entropies of the three gases was as follows: H2O < CH4 < N-2. This research provides a foundation for further exploration of shale and coalbed gases.
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