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Pore-fracture evolution under different heating rates during the in-situ pyrolysis of tar-rich coal
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Pore-fracture evolution under different heating rates during the in-situ pyrolysis of tar-rich coal
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Journal Article
Pore-fracture evolution under different heating rates during the in-situ pyrolysis of tar-rich coal
2025
Overview
The heating rate of tar-rich coal is an essential factor in maximizing the underground heating method. The physical (pore-fracture) structure is the key oil and gas transportation channel from coal. In this work, the physical structure of coal under varying heating rates was reestablished to reveal the reason for the pore-fracture evolution. Notably, the heating rate affects the physical structure in this pyrolysis process for coal. The expansion and connectivity of the physical in tar-rich coal initially rise, followed by a decline at 1–16°C/min. Within the range of heating rates, the porosity of tar-rich coal exhibits an initial increase, followed by a subsequent decrease. The maximum number of visible fractures and the formation of an interconnected network of fractures occur at a heating rate of 4°C/min. Tar-rich coal’s porosity reaches a maximum of 53.16%. Guidelines for the use of underground coal heating technology are provided by the pore-fracture variation mechanism under varying heating rates.
Publisher
IOP Publishing
Subject
