Analysis of Coal Swelling Deformation Caused by Carbon Dioxide Adsorption Based on X-Ray Computed Tomography

Nie, Xiangrong; Chen, Junbin; Cao, Yi; Gong, Diguang; Deng, Hao

doi:10.1155/2018/6939827

Cited by 8 publications

(7 citation statements)

References 29 publications

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“…The adsorption of gas leads to a decrease in the strength of coal samples [37], which can be reflected in the variation of the V P and V S . Figure 6, it can be seen that components of V P and V S of the coal samples are very different in the three directions, and meanwhile, their degree of decline varies from one another as the gas pressure increases.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…Previous studies [37][38][39][40] have shown that the adsorption and desorption of coal samples are physical phenomena. When the coal samples absorb gas, they undergo expansion.…”

Section: Variation In Ultrasonic Velocity Of Coal Samples Under Diffementioning

confidence: 99%

“…Therefore, the most possible cause is that the coal samples undergo adsorption due to the existence of fluid gas [37,46]. As a result, the strength of the coal samples is weakened and the strong ultrasonic anisotropy of the coal samples is also gradually weakened under the action of the highpressure gas adsorption expansion.…”

Section: Geofluidsmentioning

confidence: 99%

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Experimental Study on the Effect of Gas Pressure on Ultrasonic Velocity and Anisotropy of Anthracite

et al. 2019

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To research the elasticity of gas-bearing coal fluid-solid two-phase medium with seismic exploration method is critical to the prevention of gas disasters. To investigate the elasticity, the ultrasonic elastic test of anthracite samples under different gas pressures was carried out and the ultrasonic velocity and anisotropy of the samples were analyzed in this study. The results show that the velocities (P- and S-waves) decrease in turn in the strike, dip, and vertical directions. However, a negative linear correlation is proved to exist between ultrasonic velocity and gas pressure. With the increase of gas pressure, the anisotropy degree of both the P-wave and the S-wave of the samples decreases but the declining degree of the P-wave is greater than that of the S-wave. In addition, the decrease in velocity and the anisotropy degree of the P-wave is greater than that of the S-wave, indicating that the P-wave is more sensitive to gas pressure changes in terms of velocity and its anisotropy degree.

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Section: Test Results and Discussionmentioning

confidence: 99%

“…Previous studies [37][38][39][40] have shown that the adsorption and desorption of coal samples are physical phenomena. When the coal samples absorb gas, they undergo expansion.…”

Section: Variation In Ultrasonic Velocity Of Coal Samples Under Diffementioning

confidence: 99%

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Experimental Study on the Effect of Gas Pressure on Ultrasonic Velocity and Anisotropy of Anthracite

et al. 2019

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“…Moreover, the sorption process of the other gas components in the mixture with high concentration e.g. ethane, propane or carbon dioxide may also cause the swelling of the coal matrix and decrease the permeability of the transport channels for propylene 46–48 . The results of the tests displayed in Tables 3 and 4 indicate that with the increase of gas concentrations at the inlet of the sorption column, the amount of propylene adsorbed generally increases, while the amount of ethylene adsorbed changed irregularly.…”

Section: Resultsmentioning

confidence: 99%

A study of dynamic adsorption of propylene and ethylene emitted from the process of coal self-heating

Wojtacha‐Rychter

Smoliński

2019

Sci Rep

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The gaseous products emitted in the self-heating process constitute one of the parameters suggested for detecting coal spontaneous combustion in underground mining. The objective of the study is to investigate the changes of ethylene and propylene content in a gaseous mixture which flowed through a fixed bed column filled with bituminous coal of different grain size. The mixtures of fire gases were obtained from laboratory simulated heating of coal at the temperatures of 373 K, 423 K, 473 K and 523 K. Hydrocarbons of various initial concentrations were introduced to the adsorption column at the constant flow rate of 2∙10−7 m3/s. The experimental findings show that decreasing the adsorbent granulation and gases concentration causes an extended breakthrough and coal bed saturation times. In all the tests, the saturation time was gained faster for ethylene than for propylene. Thus, the content of tested hydrocarbons, which are some of the indicators for assessing the degree of the coal self-heating process, in mine air may change in time as a result of the adsorption phenomenon. It occurs particularly at the early stage of the self-heating process and in places where coal dust has been left.

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“…Adsorption time, adsorption pressure, and the microstructure affect the swelling deformation of the coal matrix after gas adsorption, and the changes in the porosity and permeability of coal after adsorption are closely related to the gas pressure in the pores and fractures and the degree of coal matrix swelling deformation. By evaluating the internal microstructure of coal under different adsorption pressures using CT and simulating coal swelling deformation using the Avizo software, the results showed that, as the adsorption pressure of gas increases, the thickness of typical fractures in the coal decreases significantly (see Figure ), causing a negative exponential decrease in porosity and permeability. , The preswelling stage of the coal matrix shows a significant decrease in fracture length, followed by a substantial decrease in fracture width …”

Section: Dynamic Evolution Of Microstructure and Macroscopic Properti...mentioning

confidence: 99%

Review on Applications of X-ray Computed Tomography for Coal Characterization: Recent Progress and Perspectives

et al. 2022

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Characterization of microscopic structure and macroscopic physical property are the basis for better understanding of coalbed methane reservoirs. X-ray computed tomography (CT), as an nondestructive measurement, has been widely and successfully applied to characterize the internal structure of coal. In this study, we introduce the principle of CT imaging and the microstructure recognition. A summary of CT imaging-based coal microstructure characterization follows, including three-dimensional (3D) microstructure reconstruction, pore and mineral quantification, and equivalent pore network model construction. We review the methods used to evaluate the macroscopic properties of coal, including porosity calculation, gas adsorption/diffusion rate test, permeability simulation, and mechanical behavior evaluation. This study discusses the application of CT to investigate the evolutionary mechanisms of microstructure and macroscopic properties during gas adsorption, temperature change, and damage deformation. We conclude this review with a summary of the challenges and application perspectives of CT. The small scanning range, limited observation accuracy, functional limitations, lengthy testing process, and high cost are some of the major hurdles in the broad application of CT for coal characterization. In the future, CT should be combined with other techniques to establish full-scale pore and fracture models, identify mineral types in microstructures, and effusively use the advantages of CT by selecting the key points in the evolutionary mechanisms of microstructure and macroscopic properties.

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Analysis of Coal Swelling Deformation Caused by Carbon Dioxide Adsorption Based on X-Ray Computed Tomography

Cited by 8 publications

References 29 publications

Experimental Study on the Effect of Gas Pressure on Ultrasonic Velocity and Anisotropy of Anthracite

Experimental Study on the Effect of Gas Pressure on Ultrasonic Velocity and Anisotropy of Anthracite

A study of dynamic adsorption of propylene and ethylene emitted from the process of coal self-heating

Review on Applications of X-ray Computed Tomography for Coal Characterization: Recent Progress and Perspectives

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