Study on pressure balanced ventilation technology applied to Shangwan Mine

In order to solve the low oxygen content, carbon monoxide over the limit and other problems occurred in the air return corner during the mining process of No.22102 coal mining face in the shallow depth and contiguous seams group of Shangwan Mine, the paper provided and applied pressure balanced ventilation technology of the system full negative pressure coal mining face, which could make thepressure in the coal mining face and goaf reached to balance and could reduce the harmful gas and toxic gas running into the coal miningface. The repeated adjustments were conducted during the establishing process of the pressure balanced ventilation system. Finally, the op- timum performance point of the pressure balanced ventilation system was found for the coal mining face: two sets of FBD-N011.2 mode lo- cal fans was run by a single electric motor, the ventilation air volume of the coal mining face was controlled at 1 829 m3/min and the air pressure of the coal mining face was 16 Pa lower than the goaf. When the adjustment of the pressure balanced ventilation system comple-ted, the monitoring and safety protection means of the pressure balanced coal mining face were provided. When the pressure balanced ven- tilation technology of the system full negative pressure coal mining face applied to No.22102 coal mining face, the oxygen content at the air retum corner of the coal mining face would be always kept at 18.0%~18.5% and the carbon monoxide content would be always kept at 5×106-20×106. Thus the safety mining of the coal miming face was ensured.