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Applied Sciences
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Coalbed Degassing Method and Technology
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Coalbed Degassing Method and Technology

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 2978

Special Issue Editors

Dr. Yidu Hong

E-Mail Website
Guest Editor
School of Environmental and Safety Engineering, Fuzhou University, Fuzhou 350108, China
Interests: coalbed degassing; safety management; quantitative risk assessment
Special Issues, Collections and Topics in MDPI journals
Dr. Xiangliang Zhang

E-Mail Website
Guest Editor
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Interests: unconventional geological resource development; plasma discharge dynamics; deep ground disaster prevention and management; the recycling and reuse of solid waste resources

Special Issue Information

Dear Colleagues,

This Special Issue serves research on coalbed degassing methods and technology. With spectacular economic growth, coal consumption in China comprised over 50 percent of the country’s total energy consumption in 2022. However, numerous gas accidents can occur in coal mining, such as gas explosions and coal–gas outbursts. These accidents are mainly due to the inherent characteristics (such as large coal reservoir stress, low permeability, and high gas content) of coalbeds in China. Moreover, Coalbed methane is a highly valuable and clean energy source. Therefore, degassing coal seams could be a double-win strategy for coal mine safety and fulfilling energy consumption. The broad scope of this Special Issue covers the study of coalbed degassing methods and technology, such as an increase in coal seam permeability and gas desorption, coal cracking by hydraulic fracturing, and physical field excitation methods. As we all know, the safe engineering of coal mines is important for human beings. It has a strong correlation with sustainability and the sustainable development of society.

Dr. Yidu Hong
Dr. Xiangliang Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • coalbed gas
  • permeability
  • gas desorption
  • coal fracturing
  • gas extraction

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Published Papers (2 papers)

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Research

12 pages, 9715 KiB  
Article
Molecular Simulation of CH4 Adsorption Characteristics under the Coupling of Different Temperature and Water Content
by Yabin Gao, Gaojie Hou, Jing Cao, Shaoqi Zhang and Ziwen Li
Appl. Sci. 2024, 14(19), 8757; https://doi.org/10.3390/app14198757 - 28 Sep 2024
Viewed by 808
Abstract
The adsorption characteristics of CH4 have an important influence on gas content prediction, gas extraction, and hazard prevention. Therefore, we explored the mechanism of CH4 adsorption under the action of water and temperature to grasp the influence of water and temperature [...] Read more.
The adsorption characteristics of CH4 have an important influence on gas content prediction, gas extraction, and hazard prevention. Therefore, we explored the mechanism of CH4 adsorption under the action of water and temperature to grasp the influence of water and temperature on the adsorption characteristics of CH4. In this paper, a giant, regular-system Monte Carlo method is used to simulate the CH4 adsorption behavior at the molecular level under different temperatures, water contents, and the coupling of both. The results indicate that an empirical formula for the coupling effect of temperature and water content on CH4 adsorption was obtained. The impact of different effects on CH4 adsorption is as follows: coupling effect > single temperature effect > single water content effect. The optimal combination is at a temperature of 363 K and a water content of 8.31%. Compared with the CH4 adsorption capacity without water at room temperature, the CH4 adsorption capacity is reduced by 68.04% under the coupling effect of the optimal combination. Temperature has a negative effect on the adsorption of CH4, and temperature changes the adsorption capacity by changing the average molecular kinetic energy of CH4. The reason why the increase in H2O reduces the adsorption capacity of CH4 is that the interaction between H2O and the oxygen-containing functional groups of coal is stronger than that of CH4. As the water content increases, the adsorption heat decreases, thereby inhibiting the adsorption of CH4. In addition, H2O has a smaller molecular dynamics radius as compared to CH4; the larger the free volume and surface area in the pore structure, the more adsorption pores it occupies, resulting in a more significant reduction in the adsorption of CH4. Full article
(This article belongs to the Special Issue Coalbed Degassing Method and Technology)
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20 pages, 15759 KiB  
Article
Effect of Wettability and Permeability on Pore-Scale of CH4–Water Two-Phase Displacement Behavior in the Phase Field Model
by Zedong Wang, Chang Guo, Nan Liu, Kai Fan, Xiangliang Zhang and Ting Liu
Appl. Sci. 2024, 14(15), 6815; https://doi.org/10.3390/app14156815 - 5 Aug 2024
Cited by 2 | Viewed by 1177
Abstract
Hydraulic measures such as hydraulic slotting and hydraulic fracturing are commonly used in coal seam pressure relief and permeability enhancement. Two-phase flow patterns of CH4–water in pore-sized coal seams after hydraulic measures are critical to improve gas extraction efficiency. The phase [...] Read more.
Hydraulic measures such as hydraulic slotting and hydraulic fracturing are commonly used in coal seam pressure relief and permeability enhancement. Two-phase flow patterns of CH4–water in pore-sized coal seams after hydraulic measures are critical to improve gas extraction efficiency. The phase field module in COMSOL Multiphysics™ 5.4 and the classical ordered porous media model were used in this paper. The characteristics of CH4–water two-phase immiscible displacement in coal seams under different capillary numbers (Ca) and viscosity ratios (M) were simulated and quantitatively analyzed. By changing the contact angle of the porous media, the flow patterns of CH4–water two-phase in coal with different wettability were simulated. Results show that wettability significantly affects the displacement efficiency of CH4. Additionally, by constructing a dual-permeability model to simulate the varying local permeability of the coal, the flow patterns of different Ca and M in dual-permeability media were further investigated. It is found that CH4 preferentially invades high-permeability regions, and the displacement efficiency in low-permeability regions increases with higher Ca and M, providing a reference for gas extraction from coal seams after hydraulic measures. Full article
(This article belongs to the Special Issue Coalbed Degassing Method and Technology)
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