Lost Gas and Desorption Kinetics of Coal at Different Pressures, Exposure Times, and Sampling Intervals
Publication: Journal of Energy Engineering
Volume 149, Issue 4
Abstract
The content of coalbed methane (CBM) is an important parameter that affects the performance of coal extraction and the safety of coal mines. The importance of this parameter is especially more pronounced when using the direct method to determine CBM content, in which the measuring accuracy of the lost gas affects the results. The loss is affected by the gas pressure and exposure time. In this article, the influence of gas pressure and exposure time on the estimation results and loss rate was investigated. Moreover, the influence of the sampling interval and observation time on the accuracy of the kinetic model in simulating the desorption process was analyzed. The obtained results demonstrated that the lost gas is positively associated with pressure and exposure time, and the lost gas rate is proportional to the exposure time. It was found that although the Barrer method outperforms the power function method, in terms of calculation accuracy, both methods have large errors. In terms of physical sense and model accuracy, the pore diffusion (IDM) model best fits the desorption kinetics of this coal. In the stable desorption stage, the desorption process is more consistent with Henry’s law. When the desorption changes violently, the desorption process is more consistent with Fick’s diffusion law. In order to ensure the consistency between the model and the experiment (95% confidence interval), the sampling interval of IDM model at 1 MPa should be more than 30 s.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by Guizhou Provincial Science and Technology Projects [2021] General Projects 514. The support greatly acknowledged and appreciated.
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Published In
Journal of Energy Engineering
Volume 149 • Issue 4 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 2, 2022
Accepted: Feb 20, 2023
Published online: Apr 27, 2023
Published in print: Aug 1, 2023
Discussion open until: Sep 27, 2023
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