Coalbed Methane in Henan

Yima Coal Industry Group 13 mines: drainage capacity of 12374m3/min 23 Gas drainage pumps on the ground (flow rate of 150 m3/min to 500m3/min) :the gas drainage capacity of 2900m3/min 67 Gas drainage pumps under the ground (flow rate of 40m3/min to 220m3/min): the gas drainage capacity of 9474m3/min.

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