Abstract
Gas-induced coal deformation plays a crucial role in fields like potential CO2 sequestration in coal and coalbed methane production. Since the gas sorption process in coal has an exothermic nature, temperature changes can inherently impact sorption and induced deformation behavior in coal. The current research aims to study the evolution of deformation behavior in terms of kinetics over time under isothermal (318 K) and non-isothermal (318→298 K) conditions for coal exposed to different gases (CO2, CH4, and He). The results indicate that sorption deformation kinetics are influenced by gas types, gas pressures, and coal composition inhomogeneity. Four linear strains measuring strain kinetics in various micro-regions on coal surfaces reveal heterogeneous behaviors linked to the distribution of macerals. Regarding the non-isothermal process, deformation kinetics display distinct patterns for the three gases. A temperature decrease causes sample shrinkage when exposed to CH4 and He, while swelling occurs with CO2 exposure, which may result from a combined effect of temperature change and differing sorption mechanisms of these gases in coal. Additionally, the temperature decrease leads to a phase state change in CO2, transitioning from supercritical to gas to liquid. The study shows continuous deformation kinetics, with no significant impact of the phase change on the deformation behavior observed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
