Journal
PLOS ONE
Volume 15, Issue 5, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0232182
Keywords
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Funding
- National Natural Science Foundation of China [51774118, 51904095]
- Open Fund of State Key Laboratory of GeoMechanics and Deep Underground Engineering, China University of Mining Technology [SKLGDUEK1814]
- Program for Leading Talents in Scientific and Technological Innovation of Henan Province [204200510032]
- Scientific and technological projects of Henan Province [192102310200]
- Natural Science Foundation of Henan Polytechnic University [J2018-1]
- Austrian Science Fund (FWF) [J2018] Funding Source: Austrian Science Fund (FWF)
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To understand the effects of thermal shock on microcrack propagation and permeability in coal, thermal shock tests were conducted on coal specimens by using a constant temperature drying oven (105 degrees C) and a SLX program controlled cryogenic tank. The growth and propagation of microcracks were measured with computer tomography (CT) scanning and scanning electron microscope (SEM) tests. Results showed that thermal shocks improved the permeability of coal significantly. Notably, the permeability of coal after thermal shocks increased from 211.31% to 368.99% and was positively correlated with temperature difference. CT scanning images revealed that thermal shocks increased the crack number, crack volume and crack width as well as smoothened and widened the gas flow paths, thereby enhancing coal permeability. Moreover, SEM images showed that heating-cooling shocks created more new microcracks, forming more complex crack propagation paths and better connectivity among microcracks in coal compared to cooling shocks. We proposed a crack propagation criterion for coal to explain the mechanism of crack failure and propagation during thermal shocks. Our experiment results and theoretical analysis indicate that the heating-cooling shock is more effective in damaging and breaking coal than the cooling shock. Thus, it can be used as an alternative approach to enhance coal permeability in the production of coalbed methane (CBM).
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