Experimental research on the law of the deformation and damage characteristics of raw coal/ briquette adsorption-instantaneous pressure relief

Zhou, Aitao; Du, Changang; Wang, Kai; Hu, Jiaying; Fan, Xihui

doi:10.1016/j.fuel.2021.122062

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…Thus, the anisotropic and expansive characteristics resulting from the heterogeneity of the coal structure and composition not only make it easier for microcracks to occur parallel to the bedding planes but also result in differential displacements between adjacent layers . The injection of CO 2 into coal seams generates expansive stress, which, when exerted on the coal matrix, leads to its failure and the generation of damage cracks. , If the expansive stress acts on the minerals, they may crack, thereby promoting the formation of permeability cracks (Figure ). In addition, the injection of CO 2 into water forms an acidic solution that is prone to dissolve carbonate minerals, thereby increasing the volume of pores or cracks .…”

Section: Resultsmentioning

confidence: 99%

Effect of CO₂–H₂O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Yi,

Pan,

Wang

et al. 2024

ACS Omega

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The adsorption of CO2 by coal leads to changes in its mechanical properties, particularly when considering supercritical CO2 and water with supercritical CO2 adsorption. This is strongly linked to the efficiency of CO2-enhanced coalbed methane (CO2-ECBM) extraction and the safety of CO2 geological storage. This study focuses on 3# coal from the Datong Mine in Gaoping City, Shanxi Province. The high-rank coal’s mechanical properties, including the triaxial compressive strength and elastic modulus, were examined under the combined effects of CO2 injection pressure, CO2 injection time, and moisture content. The triaxial compressive strength and elastic modulus of the coal showed a decrease following CO2 injection. Increasing the CO2 injection pressure, prolonging the CO2 injection time, and increasing the moisture content were favorable for coal softening. In particular, the triaxial compressive strength and elastic modulus of the coal sample after 144 h of water and supercritical CO2 softening decreased by 67.67 and 64.15%, respectively. Injecting CO2 into coal changed its failure mode. The dry raw coal sample exhibited a brittle shear failure mode, while the coal samples showed transitional shear failure after injecting 6 MPa CO2 and 8 MPa CO2 and ductile nondilatant barreling failure after injecting water and 8 MPa CO2 (with a moisture content of 3.02%). Moreover, the cumulative acoustic emission energy of the coal samples followed a similar trend to the decrease in mechanical properties under different conditions. The physical and chemical interactions among coal, CO2, and water caused the softening of coal; these included the generation of the swelling stress, the dissolution of minerals by carbonate solutions, the reduction in surface energy of coal owing to CO2 adsorption, and the extraction and plasticization reactions of organic matter in coal. The research results are of great significance for further understanding CO2-ECBM and CO2 geological sequestration.

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Section: Resultsmentioning

confidence: 99%

Effect of CO₂–H₂O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Yi,

Pan,

Wang

et al. 2024

ACS Omega

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“…This result can be attributed to the complex pore structure that facilitates the migration and diffusion of arsenic ions in the pore channels, thus enhancing the adsorption kinetics. 50 The adsorption kinetics was investigated further by analysing the As(V) adsorption using the proposed pseudo-first-order adsorption kinetic model, pseudo-second-order adsorption kinetic model and Weber-Morris intraparticle diffusion model. The relevant equations for these models are as follows: ln(q e À q t ) = ln q e À k 1 t…”

Section: Analysis Of Methods For Adsorption Kineticsmentioning

confidence: 99%

Efficient arsenate capture using mixed-metal La/Zr-MOF internal complexation

Huang,

Qi,

Duan

et al. 2024

New J. Chem.

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“…They analyzed the different damage forms of the two coal specimens and their influence on their permeability from the perspective of fine-scale damage mechanics. Zhou et al 30 used briquette and raw-coal specimens for adsorption and instantaneous pressure-relief tests, comprehensively compared and analyzed the deformation characteristics of two coal specimens, and clarified the characteristics of instantaneous pressure-relief deformation of gas-containing coal. Researchers have used different detection methods to compare the parameters of raw coal and briquettes during loading.…”

Section: Introductionmentioning

confidence: 99%

Resistivity Response Characteristics of Coal and Coal-like Materials under Uniaxial Compression

Hu,

Liu,

et al. 2024

Energy Fuels

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Resistivity is the core electrical parameter of coalfield electrical prospecting technology to identify geological anomaly areas. Studying the change characteristics of the resistivity of coal under loading is helpful to further improve the accuracy of electric prospecting in delineating the abrupt change area of coal structure and to enhance the ability to reduce and avoid disasters in coal mine production processes. In this study, the resistivity of raw coal and coal-like specimens was monitored under uniaxial compression. The influence mechanism of the coupling structure and moisture on the resistivity of raw coal and coal-like specimens was analyzed. Additionally, the change law of the electrical characteristics during the instability process and the corresponding relationship between the resistivity change and the mechanical behavior of specimens were characterized. The results show that the uniaxial compressive strength and elastic modulus of raw coal specimens are close to the similar-material specimens but much larger than the coal briquette specimens, and the effect of water on similar-material specimens is greater than the coal briquette specimens. The curve of resistivity change over time can be divided into four stages according to the change process of the stress−strain curve. The resistivity of the specimens in stages I and II exhibited a decreasing trend, except for the specimens of similar materials under natural conditions. The trends of the different types of specimens in Stage III were different, and the specimens in Stage IV showed an increasing trend. The order of the resistivity change rate at the stress peak compared to the initial point was as follows: natural similar-material specimen > water-soaked briquette > raw coal > natural briquette > water-soaked similar-material specimen. The experimental results provided theoretical support for further understanding the differences between coal-like materials and raw coal.

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Experimental research on the law of the deformation and damage characteristics of raw coal/ briquette adsorption-instantaneous pressure relief

Cited by 19 publications

References 18 publications

Effect of CO₂–H₂O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Effect of CO₂–H₂O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Efficient arsenate capture using mixed-metal La/Zr-MOF internal complexation

Resistivity Response Characteristics of Coal and Coal-like Materials under Uniaxial Compression

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Experimental research on the law of the deformation and damage characteristics of raw coal/ briquette adsorption-instantaneous pressure relief

Cited by 19 publications

References 18 publications

Effect of CO2–H2O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Effect of CO2–H2O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Efficient arsenate capture using mixed-metal La/Zr-MOF internal complexation

Resistivity Response Characteristics of Coal and Coal-like Materials under Uniaxial Compression

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Product

Resources

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Effect of CO₂–H₂O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure

Effect of CO₂–H₂O Interaction with High-Rank Coal on Mechanical Properties and Acoustic Emission Characteristics under Confining Pressure