In recent years,the demand for coal has been dramatically increased as China's economy developed rapidly. The coal production has been expanded unprecedentedly and mining depth becomes deep and deep over years. Dilution of gas by mine ventilation airflow alone can no longer solve the problem of high gas emission and gas outburst. In some coal fields, gas related disasters occur from time to time, which restricts production scale and operation efficiency as well as the corporate profit. Gas drainage ...
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