Experimental meso scale study on the distribution and evolution of methane adsorption in coal

Zhou, Dong; Feng, Zengchao; Zhao, Dong; Zhao, Yangsheng; Cai, Tingting

doi:10.1016/j.applthermaleng.2016.10.164

Cited by 22 publications

(13 citation statements)

References 24 publications

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“…SEM (Scanning Electron Microscopy) makes use of secondary electron signal imaging to observe the surface morphology of the sample, to infer material components [8], and to reveal the microstructure on the nanometre scale. Many scholars have studied the pore characteristics of coal from different angles via the SEM test, which has multiple advantages in the study of coal pore fissures, mineral matter, and microstructures [9,10].…”

Section: ρmentioning

confidence: 99%

Temperature and deformation changes in anthracite coal after methane adsorption

Feng

Cai

Zhou

et al. 2017

Fuel

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Micropores are the primary sites of methane adsorption in coal, and the heterogeneous mesostructures of coal create the non-uniform distribution of the micropores in coal. Using a thermal infrared imager, the temperature distribution on the surface of an anthracite sample during methane adsorption/desorption was tested in this paper, and a new method is advanced to calculate methane adsorption capacity in coal based on its temperature increment. The results confirm the strongly non-uniform distribution of methane adsorption in coal. A X-ray CT scan test demonstrates that the volumetric zones of coal sample with a strong methane adsorption capacity have a lower average density. In these regions, the clay minerals with developed micropores also have a strong methane adsorption capacity. During the coal skeleton deformation of methane adsorption, the high density is hard to be squeezed, while low density areas are likely to be squeezed. Therefore, the complexity density distribution in coal leads to the incompatibility of deformation, which make the direct determination of regional uptake a challenge; From the SEM micrographs of the same coal sample with different densities determined by the X-ray CT scan, the mesostructures of cell cavity pores with non-compact packing of the clay minerals appear to be the primary sites of methane adsorption in coal, and the telocollinite with fewer pores has a lower methane adsorption capacity.

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Section: ρmentioning

confidence: 99%

Temperature and deformation changes in anthracite coal after methane adsorption

Feng

Cai

Zhou

et al. 2017

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“…A large number of studies showed that the coal temperature is closely related to coal gas desorption. e higher the temperature, the larger the desorption rate [1][2][3][4][5][6][7][8][9][10][11]. Temperature changes during gas adsorption and desorption were tested using a gas outburst simulator [12,13].…”

Section: Introductionmentioning

confidence: 99%

Coal Temperature Variation Mechanism during Gas Desorption Process

Yang

Nie

et al. 2018

Advances in Civil Engineering

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To further reveal the mechanism of coal gas migration, the reasons for coal temperature changes during the methane desorption process were analyzed from the aspect of molecular motion and the thermodynamic theory. The temperature change mechanism was investigated, and the mathematical equation was established to describe the variation of temperature change during the methane desorption and diffusion process. The established equation was applied for the calculation of temperature change for two types of coal samples, and the measured and theoretical values of temperature changes were obtained. The results show that the temperature changes in the coal gas desorption process are mainly caused by the heat adsorption. The heat adsorption phenomenon was also caused by free gas expansion during the pressure relief process. The gas diffusion and work done for gas seepage also need heat adsorption. The temperature change is positively correlated to the coal gas pressure, quantity, and limit value of gas desorption volume. Due to the poor insulation in the test system, the difference between the theoretical and the measured temperature change values increase with the adsorption equilibrium pressure. It is helpful to further reveal the mechanism of coal and gas outburst. It also has an important reference value for controlling gas dynamic disasters in coal mines.

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“…The adsorption potential well depth is related to the mutual attraction between coal and methane (Ma et al., 2011a, 2011b). Owing to the variety of the oxygen-containing functional groups (Lu et al., 2014; Zhong, 2004) and side chains on the coal surface (Liu and Feng, 2012; Zhou et al., 2017a), as well as the fractal characteristics of coal surface morphology (Liu et al., 2003; Zhou et al., 2017b), the methane adsorption potential wells on natural coal surfaces exhibit obvious heterogeneity (Karacan, 2000; Wang, 2000). Similar to potential energy, adsorption sites with different adsorption capacities form rough equipotential adsorption potential surfaces (Fu et al., 2005).…”

Section: Introductionmentioning

confidence: 99%

Variation law of adsorption heat of methane and coal with inhomogeneous potential well

Feng

Wang

Zhou

et al. 2018

Adsorption Science & Technology

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The non-uniform structures of coal deposits make potential well distribution on the coal surface inhomogeneous. Deep potential wells adsorb methane molecules more easily than shallow potential wells. The methane adsorption heat release differs according to the depths of the potential wells. During isobaric adsorption, the adsorption heat in the high-temperature stage is significantly higher than that in the low-temperature stage. A lower adsorption pressure results in greater adsorption heat variation during a temperature increase. During the isothermal adsorption process, the adsorption heat is higher in the low-pressure stage, with the preferential adsorption characteristics of deep potential wells.

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Experimental meso scale study on the distribution and evolution of methane adsorption in coal

Cited by 22 publications

References 24 publications

Temperature and deformation changes in anthracite coal after methane adsorption

Temperature and deformation changes in anthracite coal after methane adsorption

Coal Temperature Variation Mechanism during Gas Desorption Process

Variation law of adsorption heat of methane and coal with inhomogeneous potential well

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