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Schematic of the coal sample gas adsorption–desorption with water injection. 1—Manual hydraulic pump, 2—water injection pump, 3—adsorption tank, 4,5,6,7—precise pressure gauge, 8—Gas inflating tank, 9—high-purity methane cylinder, 10—desorption apparatus, 11—vacuum gauge, 12—Vacuum pump, 13—vacuum silicone tube, 14—constant temperature water bath, A–E—high-pressure valve, and H—glass three-way valve.
