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- Title
Numerical Simulation of Microwave-Induced Cracking of Coal Containing Pyrite Powder Based on a Multi-Field Coupling Model.
- Authors
Hong, Yidu; Long, Shengyi; Sun, Xiaowan
- Abstract
Microwave irradiation has become a potential technical method for coalbed degassing, which can effectively improve its permeability. A coupled electromagnetic—thermomechanical damage (ETMD) model was established to study the damage characteristics of coal containing pyrites. Under microwave irradiation, the temperature increase rate of pyrite was significantly higher compared to the coal matrix. The coal matrix was cracked by expansion stress in high-temperature spots. In the rotational heating mode, the coal matrix was easier to damage than under the static heating mode. The coal matrix damage efficiency was also related to the position of the sample under the static heating mode. Uniform centripetal pressure could inhibit coal matrix damage. Moreover, the pressure distribution affected the damage paths. Compared to no confining pressure, the percentage of areas damaged in coal was lower under low parallel pressure and higher under high parallel pressure.
- Subjects
COAL; PYRITES; COMPUTER simulation; PERMEABILITY; MICROWAVES
- Publication
Applied Sciences (2076-3417), 2024, Vol 14, Issue 24, p11835
- ISSN
2076-3417
- Publication type
Academic Journal
- DOI
10.3390/app142411835