Surface properties of pulverized coal and its effects on coal mine methane adsorption behaviors under ambient conditions

Li, Qingzhao; Lin, Baiquan; Wang, Ke; Zhao, Mi; Ruan, Maliang

doi:10.1016/j.powtec.2014.10.020

Cited by 54 publications

(19 citation statements)

References 33 publications

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“…As shown in Figure 8, the adsorption heat of vitrinite concentrate for methane is always greater than that of the inertinite concentrate for all five coal samples, indicating that the adsorption capacity of vitrinite concentrate is larger than that of the inertinite concentrate. This result agrees well with that of Li et al [46], who observed that the coal surface with a higher content of vitrinite seems to have a faster adsorption rate and higher affinity with methane. This finding also agrees with that of Crosdale et al [35], who found that in most cases, vitrinite-rich coals have a greater adsorption capacity than their inertinite-rich equivalents.…”

Section: Adsorption Heat Of Different Maceral Concentrates Forsupporting

confidence: 93%

“…It has been understood that the larger pore volume corresponds to a stronger adsorption capability of coal for methane [4,46]. From Figure 9(b), it is clearly observed that the total pore volume of inertinite concentrates is larger than that of vitrinite concentrates, indicating that the inertinite concentrates should adsorb more methane than their rank equivalent vitrinite concentrates.…”

Section: Correlation Between the Adsorptionmentioning

confidence: 93%

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Effects of Maceral Compositions of Coal on Methane Adsorption Heat

et al. 2018

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The role of maceral compositions (vitrinite and inertinite) in the adsorption characteristics of coal has not been fully understood in terms of energy. In this study, using a microcalorimeter, the adsorption heat of maceral compositions for methane is directly measured for five groups of Chinese coal samples with different coal ranks. The results show that the adsorption heat of the maceral concentrates varies with increasing coal rank, but for the same coal sample, the vitrinite concentrates have a higher adsorption heat than the inertinite concentrates. Furthermore, the adsorption heat of both vitrinite and inertinite concentrates is highest at the long-flame coal stage. This finding indicates that the coalification and maceral compositions have significant effects on the adsorption heat of coal for methane. It is observed that although the inertinite concentrates have a larger pore volume, they are less microporous than their rank equivalent vitrinite concentrates, resulting in lower adsorption heat. Furthermore, it is revealed that the adsorption heat of both vitrinite and inertinite concentrates is primarily correlated to the content of oxygen-containing functional groups and aliphatic hydrocarbons.

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Section: Adsorption Heat Of Different Maceral Concentrates Forsupporting

confidence: 93%

Section: Correlation Between the Adsorptionmentioning

confidence: 93%

Effects of Maceral Compositions of Coal on Methane Adsorption Heat

et al. 2018

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“…It has been confirmed that at low equilibrium pressure, methane adsorption on the coal surface follows the monolayer adsorption theory [8,42,59]. Thus, the Langmuir adsorption equilibrium equation was adopted to correlate all the measured adsorption data, and it can be expressed as [60]:…”

Section: Evaluation Of Methane Adsorption Capacitymentioning

confidence: 99%

“…V L and P À1 L are related to the methane adsorption capacity of coal and the gas adsorption rate to the adsorbent [8], respectively.…”

Section: Evaluation Of Methane Adsorption Capacitymentioning

confidence: 99%

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Fractal characteristics of coal samples utilizing image analysis and gas adsorption

Liu

Nie

2016

Fuel

212

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Impact of coal composition and pore structure on gas adsorption: a study based on a synchrotron radiation facility

2019

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A better knowledge about the impact of coal composition and pore structure on gas adsorption is of great significance for coalbed methane exploration and uneconomic coalbed CO2 storage. Coal is a porous medium with complex organic components, and most pores in coal are nanopores that have a complex geometrical morphology. As a result, it is significantly necessary to investigate the impact of coal composition and pore structure on gas adsorption based on coal 3D nanopore structure. Synchrotron radiation nano‐computed tomography (CT) was applied to acquire 3D coal nanopore structure and synchrotron radiation small‐angle X‐ray scattering (SAXS) was used to obtain the pore surface fractal dimension. The coal with higher pore surface fractal dimension presents higher Langmuir volume. Based on the 3D nanopore structure acquired by synchrotron radiation nano‐CT, gas adsorption capacity was characterized by the adsorbed gas amount on unit pore surface area. It was found that gas adsorption capacity depends on the coal composition. There is a negative correlation between gas adsorption capacity and ash content and oxygen‐containing groups, and a positive correlation between gas adsorption capacity and vitrinite contents. Hysteresis between desorption and adsorption isotherms is dependent upon the ratio of throat number to pore number, and the hysteresis becomes more significant when the ratio is larger. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Surface properties of pulverized coal and its effects on coal mine methane adsorption behaviors under ambient conditions

Cited by 54 publications

References 33 publications

Effects of Maceral Compositions of Coal on Methane Adsorption Heat

Effects of Maceral Compositions of Coal on Methane Adsorption Heat

Fractal characteristics of coal samples utilizing image analysis and gas adsorption

Impact of coal composition and pore structure on gas adsorption: a study based on a synchrotron radiation facility

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