Experimental Study on Methane Desorption from Lumpy Coal under the Action of Hydraulic and Thermal

Figure 2

Schematic diagram of the experimental apparatus used in this study. C1 and C2: methane (CH₄) and helium (He) cylinder storage; F1 and F2: flow of gas; G1, G2, and G3: gauge for displaying the pressure of methane, helium, and water, respectively; G4: negative gauge for air pressure used for vacuum; G5: gauge for sample gas pressure; V1, V2, V3, V4, and V5: needle valves; S1, S2, and S3: three-port valves; M1: water injection pump; M2: vacuum pump; M3: temperature-controlling device; M4: measurement system.