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Wang Z, Huang G, Liu X, Liu P, Lin F, Nie B, Luo B. Investigation on the Gas Emission Law of Water-Containing Coal across the Rank Range. ACS Omega 2024; 9:17289-17296. [PMID: 38645359 PMCID: PMC11024968 DOI: 10.1021/acsomega.3c10295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 03/17/2024] [Accepted: 03/20/2024] [Indexed: 04/23/2024]
Abstract
Water commonly occurs in coal reservoirs, and it can block the gas flow channels. This has a significant influence on methane transportation within coal. To reveal the gas emission law of water-containing coal across the rank range, three typical coal samples with different coal ranks covering lignite to anthracite were selected in this work. The initial velocity of gas emission (ΔP) under the effect of moisture was measured, and the combination of scanning electron microscopy and mercury injection method was adopted to study the pores and fracture characteristics within coal. Distribution features of oxygen-containing groups in coal were explored by X-ray photoelectron spectroscopy. The microscopic influence mechanism of the water content on ΔP in coal was also comprehensively elucidated. The experimental results show that the moisture content has an obvious inhibitory effect on the ΔP of coal, but the degree of influence on different coal rank samples was different. As the pore space of anthracite (sample XJ) is developed with numerous gas transportation channels, the ΔP has less changes at the lower moisture content (<4.36%). When the moisture content is >4.36%, a large number of water molecules will band together to form water clusters, hindering the gas release, thus greatly reducing the ΔP. However, the change of lignite (sample SL) shows an inverse trend to that of anthracite. Its ΔP is sensitive to the moisture content due to the small number of pores and low porosity. In addition, a great number of oxygen-containing groups in lignite can also provide good surface hydrophilicity for water molecules, and even a small amount of the moisture content (<3.21%) can block most of the pore and facture channels within coal, leading to the remarkable decrease in ΔP. For bituminous coal (sample ML), the distribution of pores and oxygen-containing groups is the most uniform, and the ΔP decreases linearly with the increase in the moisture content.
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Affiliation(s)
- Zhen Wang
- State
Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency
Controlling, China Coal Technology and Engineering
Group Chongqing Research Institute, Chongqing 400037, China
- State
Key Laboratory of Coal Mine Disaster Dynamics and Control, School
of Resources and Safety Engineering, Chongqing
University, Chongqing 400044, China
| | - Guangli Huang
- State
Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency
Controlling, China Coal Technology and Engineering
Group Chongqing Research Institute, Chongqing 400037, China
- State
Key Laboratory of Coal Mine Disaster Dynamics and Control, School
of Resources and Safety Engineering, Chongqing
University, Chongqing 400044, China
| | - Xianfeng Liu
- State
Key Laboratory of Coal Mine Disaster Dynamics and Control, School
of Resources and Safety Engineering, Chongqing
University, Chongqing 400044, China
- State
Key Laboratory for Fine Exploration and Intelligent Development of
Coal Resources, China University of Mining
and Technology, Xuzhou, Jiangsu 221116, China
| | - Peng Liu
- State
Key Laboratory of Coal Mine Disaster Dynamics and Control, School
of Resources and Safety Engineering, Chongqing
University, Chongqing 400044, China
| | - Fujin Lin
- State
Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency
Controlling, China Coal Technology and Engineering
Group Chongqing Research Institute, Chongqing 400037, China
- State
Key Laboratory of Coal Mine Disaster Dynamics and Control, School
of Resources and Safety Engineering, Chongqing
University, Chongqing 400044, China
| | - Baisheng Nie
- State
Key Laboratory of Coal Mine Disaster Dynamics and Control, School
of Resources and Safety Engineering, Chongqing
University, Chongqing 400044, China
| | - Binyu Luo
- Hubei
Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic
Mineral Resources, Wuhan University of Science
and Technology, Wuhan 430081, China
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Zhu W, Cao XK, Fang J, Chang JM, Wei YD, Li X, Li Y, Zheng ZG, Zhao JY, Song JJ, Lu SP. Correlation Analysis of the Change Law of Index Gas and Active Functional Groups in the Process of High-Temperature Spontaneous Combustion of Minerals in the Fushun West Mine. ACS Omega 2022; 7:33199-33215. [PMID: 36157723 PMCID: PMC9494442 DOI: 10.1021/acsomega.2c03562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 08/30/2022] [Indexed: 06/01/2023]
Abstract
The spontaneous combustion of underground minerals causes huge property losses and ecological damage. Coal and oil shale are co-associated minerals in the Fushun West Mine, and both have the ability to undergo oxidative spontaneous combustion. To study the effect of microstructure changes on the macroscopic gas product concentration during the mineral oxidation spontaneous combustion process in the Fushun West Mine, this study used a high-temperature temperature-programmed test to obtain the change trend of gas product concentration in different oxidation stages of minerals. Using Fourier transform infrared spectroscopy technology, the changes in active functional groups of surface molecules during the process of mineral oxidation and spontaneous combustion were identified. Finally, using the gray correlation degree, correlation analysis between the concentration of gas products and the concentration of active functional groups in different oxidation stages was carried out. The key reactive functional groups affecting mineral spontaneous combustion were identified. The essential reason for the change in the gas product was revealed.
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Affiliation(s)
- Wei Zhu
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Xin-Kuan Cao
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Jun Fang
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Jia-Ming Chang
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology (XUST), 58, Yanta Mid. Rd., Xi’an, Shaanxi 710054, PR China
| | - Yue-Dong Wei
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Xing Li
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Yue Li
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Zhi-Gang Zheng
- Ecological
Environment Science & Technology Co. Ltd, China Coal Technology
& Engineering Group, Beijing 100013, PR China
| | - Jing-Yu Zhao
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology (XUST), 58, Yanta Mid. Rd., Xi’an, Shaanxi 710054, PR China
| | - Jia-Jia Song
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology (XUST), 58, Yanta Mid. Rd., Xi’an, Shaanxi 710054, PR China
| | - Shi-Ping Lu
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology (XUST), 58, Yanta Mid. Rd., Xi’an, Shaanxi 710054, PR China
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