Direct observation of coal-gas interactions under thermal and mechanical loadings
文献类型：期刊论文
| 作者 | Wang, Chunguang1,2,5; Feng, Jili3; Liu, Jishan4; Wei, Mingyao5,6; Wang, Changsheng1,2; Gong, Bin1,2 |
| 刊名 | INTERNATIONAL JOURNAL OF COAL GEOLOGY
 |
| 出版日期 | 2014 |
| 卷号 | 131页码:274-287 |
| 关键词 | Coal-gas interaction Gas desorption Coal swelling and shrinkage Thermal-mechanical loading |
| ISSN号 | 0166-5162 |
| DOI | 10.1016/j.coal.2014.06.021 |
| 英文摘要 | In this study we directly observe the multi-physical process of coal-gas interaction induced by thermal impacts through a specially designed facility. This facility can be used to measure the evolution of coal deformation and migration of originally existing gas in coal. Tests were conducted through three stages, i.e., heating, uniaxial loading, and re-heating stage. In the first-stage, heating triggers two concurrent effects, coal expansion and gas migration. It was found that both the coal deformation and gas flow firstly increase with the rise of coal temperature. When the coal temperature is in isothermal equilibrium, the volume of coal is either recovered or maintained unchanged approximately. In the course of the process, the gas flow begins to peak off by a relatively low flow rate. The results at the uniaxial loading showed that the gas migration is significantly controlled by the progressive deformation of the stressed coal under isothermal conditions. From the relationship between the coal deformation and concurrent gas flow, the direction of gas migration depends upon the development of cracks. It consequently leads to either sucking of gas to the opening of cracks/fractures, or discharging of gas to the closure of cracks and pores. The re-heating at the last stage can accelerate gas discharge. The concentrations of released gas species increase proportionally with the coal temperature. In order to quantify the thermodynamic characteristics of gas migration, the concentration of desorbing gas is defined as a function of temperature by using the Arrhenius equation. The results statistically showed that CO2 has a stronger affinity for the coal than CH4. It was also revealed by the results that the deformation evolution of the heated coal is related to the competition between thermal swelling of solid coal and shrinking by gas desorption. Finally, it was indicated by the present tests that the complex deformation potentially makes it possible to deteriorate in the mechanical properties of coal. This work can help to understand the mechanism of coal-gas interaction induced by multi-physical fields including thermal-induced coal deformation, residual gas desorption and adsorption, and coal shrinkage. (C) 2014 Elsevier B.V. All rights reserved. |
| WOS研究方向 | Energy & Fuels ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000343842800024 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/3629]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo ; 2.Shandong Univ Sci & Technol, Minist Sci & Technol ; 3.China Univ Min & Technol, Sch Mech & Civil Engn, State Key Lab GeoMech & Deep Underground Engn ; 4.Univ Western Australia, Sch Mech & Chem Engn ; 5.Chinese Acad Sci, Inst Rock & Soil Mech ; 6.China Univ Min & Technol, State Key Lab Coal Resources & Safe Min |
| 推荐引用方式 GB/T 7714 | Wang, Chunguang,Feng, Jili,Liu, Jishan,et al. Direct observation of coal-gas interactions under thermal and mechanical loadings[J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY,2014,131:274-287. |
| APA | Wang, Chunguang,Feng, Jili,Liu, Jishan,Wei, Mingyao,Wang, Changsheng,&Gong, Bin.(2014).Direct observation of coal-gas interactions under thermal and mechanical loadings.INTERNATIONAL JOURNAL OF COAL GEOLOGY,131,274-287. |
| MLA | Wang, Chunguang,et al."Direct observation of coal-gas interactions under thermal and mechanical loadings".INTERNATIONAL JOURNAL OF COAL GEOLOGY 131(2014):274-287. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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