期刊
ENERGY & FUELS
卷 35, 期 9, 页码 7844-7857出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c00324
关键词
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资金
- Fundamental Research Funds for the Universities of Henan Province [NSFRF180305]
- China National Natural Science Foundation [51774119, 51704100]
- Open Subject of State Key Laboratory of Coal Mine Disaster Dynamics Control [2011DA105287-KF201313]
- Program for Changjiang Scholars and Innovative Research Team [PCSIRT1235]
- China Scholarship Council Fund [201808410203]
- Open Foundation of State Key Laboratory Cultivation Base for Gas Geology and Gas Control of Henan Province [WS2018B13]
- Key R&D and Promotion Projects in Henan Province [202102310222]
The experiments showed that the apparent diffusion coefficient and apparent permeability decrease with time due to the multiscale pore structure in coal. The multiscale dynamic apparent diffusion model accurately describes the full-time process of unidirectional gas desorption flow in coal. The proposed model demonstrates broader applicability compared to current models.
The low permeability of coal seams is a key factor restricting gas extraction. The multiscale pores in low-permeability coal make coal permeability present the multiscale characteristics. However, the conventional steady-state method cannot measure the multiscale permeability of low-permeability coal well. In this study, a unidirectional multiscale dynamic apparent diffusion model is proposed as an analytical model, and a multiscale dynamic apparent diffusion coefficient is defined. In addition, an experimental method for measuring low permeability from macroscale to microscale pores is provided. The experiments of gas desorption flow in the unidirectional, radial, and spherical directions were conducted to compare with each other. The research results show that (1) the apparent diffusion coefficient and apparent permeability decrease with time because of the multiscale pore structure in coal. (2) The multiscale dynamic apparent diffusion model can accurately describe the full-time process of the unidirectional gas desorption flow in coal. (3) The proposed model shows a broader applicability with a comparison to the current models.
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