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Optimization of electroosmotic flow to enhance the removal of contaminants from low‑permeable soils. J APPL ELECTROCHEM 2023. [DOI: 10.1007/s10800-023-01845-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Zhang X, Cheng J, Kang T, Zhou X, Zhang L. Electrochemical Modification on CH 4 and H 2O Wettability of Qinshui Anthracite Coal: A Combined Experimental and Molecular Dynamics Simulation Study. ACS OMEGA 2021; 6:24147-24155. [PMID: 34568693 PMCID: PMC8459427 DOI: 10.1021/acsomega.1c03661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Indexed: 06/13/2023]
Abstract
The wettability of gas and liquid on the coal surface is one of the fundamental factors that affect the depressurization process during the coalbed methane (CBM) extraction. The wettability of coal surface changed after electrochemical modification, leading to the change in methane adsorption/desorption and water movement in coal reservoirs. Thus, the CH4 adsorption amount, desorption ratio, and coal-water contact angle of raw and modified anthracite samples were measured and simulated. The mechanism of electrochemical modification was analyzed by functional groups, surface free energy, pore characteristics, interaction energies, and coal swelling. The experimental results showed that the saturated adsorption amount of methane decreased from 41.49 to 34.72 mL/g, and the simulation results showed that the saturated adsorption amount of methane decreased from 2.01 to 1.83 mmol/g. The coal-water contact angle also decreased from 81.9 to 68.6°. Electrochemical modification mainly affects the wettability of CH4 and H2O by changing the functional groups and pore structures of anthracite, and the influence on functional groups of coal surface is greater. This work provided a basis for enhancing CBM extraction by electrochemical modification.
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Affiliation(s)
- Xiaoyu Zhang
- Research
Institute of Mine Big Data, China Coal Research
Institute, Beijing 100013, P. R. China
- State
Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, P. R. China
| | - Jian Cheng
- Research
Institute of Mine Big Data, China Coal Research
Institute, Beijing 100013, P. R. China
- State
Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, P. R. China
| | - Tianhe Kang
- Key
Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
| | - Xianxian Zhou
- College
of Chemistry and Chemical Engineering, Taiyuan
University of Technology, Taiyuan 030024, P. R. China
| | - Liankun Zhang
- Key
Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
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Zhang L, Kang T, Kang J, Zhang X, Zhang B, Chai Z, Zhang R, Wang Y, Kang G, Zhao G. Effect of Cyclical Microwave Modification on the Apparent Permeability of Anthracite: A Case Study of Methane Extraction in Sihe Mine, China. ACS OMEGA 2021; 6:15001-15011. [PMID: 34151081 PMCID: PMC8209807 DOI: 10.1021/acsomega.1c01122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 05/18/2021] [Indexed: 05/16/2023]
Abstract
The application of cyclical microwave modification for accelerating the extraction of coalbed methane (CBM) from anthracite is limited. In this study, the apparent permeability of anthracite samples before and after each microwave treatment (three in total) for 120 s was measured by a self-built permeability-testing platform. Microcomputed tomography (micro-CT) technology and image-processing technology were employed to analyze the 3D micron-scale pore structures, especially the quantitative characterization of connected pores and throats. After modification, the average apparent permeability increased from 0.6 to 5.8 × 10-3 μm2. The generation, expansion, and connection of micron-scale pores and fractures became more obvious with each treatment. The total porosity increased from 3.5 to 6.2%, the connected porosity increased from 0.9 to 4.8%, and the porosity of isolated pores decreased from 2.5 to 1.4% after three cycles. The number, volume, and surface area of the connected pores as well as the number, radius, and surface area of the throats were significantly increased. In addition, the release of alkyl side chains from the anthracite surface reduced the capacity of the anthracite to adsorb CH4 and the decomposition of minerals promoted the development and connectivity of pores. As a result, the gas seepage channels have been greatly improved. This work provides a basis for micron-scale pore characterization after cyclical microwave modification and contributes to CBM extraction.
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Affiliation(s)
- Liankun Zhang
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
- Yuncheng
Vocational and Technical University, Yuncheng 044000, PR China
| | - Tianhe Kang
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Jianting Kang
- College
of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Xiaoyu Zhang
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Bin Zhang
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Zhaoyun Chai
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Runxu Zhang
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Yuefang Wang
- Yuncheng
Vocational and Technical University, Yuncheng 044000, PR China
| | - Guanxian Kang
- College
of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Guofei Zhao
- Key
Laboratory of In Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China
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