Characteristics and Physical–Environmental Coupling Evolution Model of Immediate On-Site Gas Desorption from Coal during Postmining Activities
Year: 2026
Type: article
Abstract: Methane emissions from postmining activities originate from gas dissipation during transport and storage. This study investigates the immediate desorption characteristics and evolution laws of postmining coal through long-term tests on coarse particles and isothermal tests on fine particles under varying parameters. Results show a two-stage desorption process: a rapid linear growth stage posthoisting but before transport and processing, followed by a gradual decline and stabilization. The desorption volume exhibits a two-stage trend with coal rank, fluctuating from low- to high-metamorphic bituminous coal and increasing linearly from high-metamorphic bituminous coal to anthracite. Elevated ambient temperatures and smaller particle sizes significantly accelerate desorption rates. Integrating the Borges and exponential empirical models, a multiparameter coupled mathematical desorption model was constructed incorporating time, vitrinite reflectance, temperature, and particle size. The model shows excellent fitting performance for raw coal from typical mines (R2 > 0.98). This model effectively solves the challenge of accurately estimating initial gas loss during postmining activities. These findings provide a solid theoretical and experimental foundation for the measurement and accounting of postmining methane emissions.
Source: ACS Omega
Authors: Hong Ding, Qingming Long
Language: English
Subfield: Fuel Technology
Field: Energy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,935
OpenAlex ID: W7225621878