THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Numerical simulation of damage and permeability evolution mechanism of coal seam under microwave radiation

ABSTRACT
Microwave heating is an effective method to improve the recovery rate of coalbed methane. In this study, a fully coupled electromagnetic thermodynamic model was developed to study the effects of coal compaction, thermal expansion and thermal gas desorption on coal deformation. The simulation results show that although in the initial stage, the decrease of gas pressure by microwave is not obvious, the distribution of gas pressure in coal seam is obviously affected by microwave after a period of time. The microwave can also affect the mineral composition of rocks, cause rock damage, promote the development of cracks, and promote the increase of permeability.
KEYWORDS
PAPER SUBMITTED: 2018-05-12
PAPER REVISED: 2018-06-21
PAPER ACCEPTED: 2018-08-21
PUBLISHED ONLINE: 2019-04-14
DOI REFERENCE: https://doi.org/10.2298/TSCI180512133X
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