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Experimental study on dynamic impact of hydrothermal treated coal in different coal ranks.

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Title: Experimental study on dynamic impact of hydrothermal treated coal in different coal ranks.
Authors: Wang, Xiaofei1 (AUTHOR), Hu, Shaobin1,2 (AUTHOR) hsbhhu@126.com, Wang, Enyuan1 (AUTHOR) weytop@cumt.edu.cn
Source: Fuel (0016-2361). Jul2024, Vol. 368, pN.PAG-N.PAG. 1p.
Subjects: Coalbed methane, Coal, Coal mining, Coalfields, Pore size distribution, Hydrothermal deposits, Sound waves
Abstract: • The study conducted hydrothermal treatment and Hopkinson bar impact experiments on different ranks of coal. • Hydrothermal treatment caused initial damage to the coal, leading to a reduction in its dynamic strength. • Combined with the adsorption resolution curve, the pore expansion of hydrothermally treated coal was modeled. • A model of dynamic damage after hydrothermal treatment of coal under true triaxial perimeter pressure was proposed. The new supercritical hydrothermal fracturing technology possesses promising applications in the field of coal and coalbed methane extraction. The research designed hydrothermal processing and true triaxial Hopkinson bar impact fracturing experiments on coals of different coal rank, measured the damage using acoustic waves and scanning electron microscopy. The results of the study showed that: 1. Hydrothermal treatment caused initial damage to coals in different coal ranks, resulted in the reduction of coal acoustic wave speed and dynamic strength. 2. As the coal rank advanced, the metamorphic degree of coal increased and its dynamic strength increased, and the dynamic strength of anthracite reached 149.79 MPa. 3. A pore expansion model of hydrothermally treated coal was established, which indicated that the porosity of hydrothermally fractured coal increased as a whole but the distribution of pore size was more concentrated in the process of hydrothermal fracturing in conjunction with adsorption resolution curves. 4. A dynamic damage constitutive model of coal after hydrothermal treatment under true triaxial circumferential pressure was proposed, which had great significance for evaluating the dynamic disaster safety after hydrothermal fracturing in coal mines. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• The study conducted hydrothermal treatment and Hopkinson bar impact experiments on different ranks of coal. • Hydrothermal treatment caused initial damage to the coal, leading to a reduction in its dynamic strength. • Combined with the adsorption resolution curve, the pore expansion of hydrothermally treated coal was modeled. • A model of dynamic damage after hydrothermal treatment of coal under true triaxial perimeter pressure was proposed. The new supercritical hydrothermal fracturing technology possesses promising applications in the field of coal and coalbed methane extraction. The research designed hydrothermal processing and true triaxial Hopkinson bar impact fracturing experiments on coals of different coal rank, measured the damage using acoustic waves and scanning electron microscopy. The results of the study showed that: 1. Hydrothermal treatment caused initial damage to coals in different coal ranks, resulted in the reduction of coal acoustic wave speed and dynamic strength. 2. As the coal rank advanced, the metamorphic degree of coal increased and its dynamic strength increased, and the dynamic strength of anthracite reached 149.79 MPa. 3. A pore expansion model of hydrothermally treated coal was established, which indicated that the porosity of hydrothermally fractured coal increased as a whole but the distribution of pore size was more concentrated in the process of hydrothermal fracturing in conjunction with adsorption resolution curves. 4. A dynamic damage constitutive model of coal after hydrothermal treatment under true triaxial circumferential pressure was proposed, which had great significance for evaluating the dynamic disaster safety after hydrothermal fracturing in coal mines. [ABSTRACT FROM AUTHOR]
ISSN:00162361
DOI:10.1016/j.fuel.2024.131648