PRACTICE AND COGNITION OF OPTIMIZING AND REBUILDING VENTILATION SYSTEM OF CENTER VENTILATION SHAFT IN THE QINAN MINE

The ventilation resistance of the west side and the north side serviced by the enter ventilation shaft is not a equilibrium condition in the Qinan Mine.On the north side,the ventilation pate is long and the ventilation resistance is strong and the wind capacity doesn't meet the yielding demand.After the ventilation system is optimized and rebuilt,the ventilation resistance of the north side descends to great extent and the wind capacity of the side ascends,which meets the yielding demand and makes the Qinan mine attain a better benefit.