Design of ventilation system and selection of proper duct in development tunnel of eastern panel No.3 in mechanized mine No.1 of Parvadeh in Tabas coal mine

Ventilation is One of the vital issues in advancing tunnels of mine network, including mine No.1 of Parvadeh, because the various pollutants especially dusts and blasting gases are concentrated in the face which should be directed to the outside of tunnel. To provide a ventilation system in advancing tunnels, at first, the air flow quantity has to be calculated in viewpoints of fire damp, dusts, blasting gases(if needed) and respiration and then the maximum amount must be considered as a base for ventilation design. In order to ventilate the tunnel face with cross section area of 15 m2, the calculated air quantity is 6.75 m3/s. In addition, to perform the auxiliary ventilation, three duct types were compared which variance analysis proved that the duct with 900 mm in diameter had a significant effect on static pressure drop in probability level of 5%. Finally, to circulate the required air, different fans were studied and it was found that the blowing fan with rate of 12 m3/s and pressure of 7.4 kPa is suitable for ventilation of advancing tunnel in the mine.