Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal
Xu, Shipei1,3; Hu, Erfeng2; Li, Xingchun1; Xu, Yu1
AbstractBetter understanding of the storage and transportation characteristics of methane in coal seams is important to further develop and utilize the methane resources in the coalbed. This study is devoted to investigating the relationship between methane adsorption performance and pore structure by analyzing twelve coal samples derived from the typical methane-rich coalbeds in China. To eliminate the influence of inorganic components such as ash in different coal samples, a specific fixed-bed reactor with internals was employed for the coal treatment. Based on N-2/CO(2)adsorption analysis at low-pressure condition, the pores in coal were classified into three types in this study: ultra-micropore (pore width < 1 nm), micropore (1 nm < pore width < 2 nm) and mesopores (2 nm < pore width < 50 nm). According to the Langmuir equation, the Langmuir volume (V-L) and Langmuir pressure (P-L) were calculated to characterize the high-pressure adsorption of methane, and the influence of methane adsorption associated parameters was evaluated. The results indicate that N-2-pore size distributions (1-50 nm) varied a lot among samples, suggesting the significant heterogeneity of pore structure among samples. Estimated by the FHH model, pore surface fractal dimension (D-1) and spatial geometry fractal dimension (D-2) were, respectively, ranging in 2.059-2.808 and 2.649-2.852, which indicated that the more irregular surface, namely more inhomogeneous pore structures, resulted in the more surface area and stronger adsorption capability. By grey relational analysis (GRA), the importance of the pore structure factors on methane adsorption was identified, as an order from the most important to the least: ultra-micropore volume (0.9085) > ultra-micropore surface area (0.8976) > fractal dimension D-1(0.8862) > N-2-BET surface area (0.7915) > micropore volume (0.5035) > micropore surface area (0.5006). This study shows the influence of parameters of pore structure on methane adsorption of coal and clarifies the order importance of these parameters by the GRA method.
KeywordMethane adsorption Pore structure Modified coal Fractal dimension Grey relational analysis
Funding ProjectNational Science and Technology Major Project of China[2016ZX05040-003]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
Funding OrganizationNational Science and Technology Major Project of China
WOS IDWOS:000552888200001
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Document Type期刊论文
Corresponding AuthorHu, Erfeng; Li, Xingchun
Affiliation1.CNPC Res Inst Safety & Environm Technol, State Key Lab Petr Pollut Control, Beijing 102206, Peoples R China
2.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China
3.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
First Author AffilicationCenter of lonic Liquids and Green Engineering
Recommended Citation
GB/T 7714
Xu, Shipei,Hu, Erfeng,Li, Xingchun,et al. Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal[J]. NATURAL RESOURCES RESEARCH,2020:16.
APA Xu, Shipei,Hu, Erfeng,Li, Xingchun,&Xu, Yu.(2020).Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal.NATURAL RESOURCES RESEARCH,16.
MLA Xu, Shipei,et al."Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal".NATURAL RESOURCES RESEARCH (2020):16.
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