Experimental Study of Desorption and Seepage Characteristics of Single Gas and CO2–CH4 Gas Mixture in Coal

Desorption Characteristics of CH4–C2H6 Mixed Gas in Heavy Hydrocarbon-Rich Coal Seams

“…The pores became increasingly complex with an increasing coalification degree. Yu et al conducted an adsorption–desorption experiment of CH 4 –CO 2 mixed gas; they found the concentration of CH 4 in the desorption gas was always more significant than that of CO 2 , which was considered to be closely related to the microscopic composition and coal rank . Li et al simulated the adsorption of CH 4 –N 2 mixed gas on coal through triaxial stress tests, found that the coal body expanded and deformed, and the strength of the coal body decreased .…”

“…Yu et al conducted an adsorption–desorption experiment of CH 4 –CO 2 mixed gas; they found the concentration of CH 4 in the desorption gas was always more significant than that of CO 2 , which was considered to be closely related to the microscopic composition and coal rank. 21 Li et al simulated the adsorption of CH 4 –N 2 mixed gas on coal through triaxial stress tests, found that the coal body expanded and deformed, and the strength of the coal body decreased. 22 Combining the results of CO 2 –N 2 adsorption experiments with molecular dynamics software, Xu et al constructed microporous and mesoporous models of the loading and migration processes, and they proposed the dual adsorption mechanism of N 2 –CO 2 .…”