Development Status and Tendency of Long Distance Local Ventilation Technology

The paper stated the present common applied six long distance local ventilation technologies at home and abroad.Due to the ventilation relability and th e heading ventilation distance with no restriction, the paper pointed out that the double roadways simultaneous heading, the full ventilation pressure and the local ventil ator combined long distance local ventilation and the local ventilation technology to set up the ventilation reservoir would be the main technology of the long distance lo cal ventilation in the large coal mine.Under the certain conditions, the local ventilation with the borehole pilot ventilation would have good technical and economic benefi ts.With the leakage reduction and resistance reduction technology of the flexible duct further improved, within the heading distance less than 3 000 m, the forced local V entilation with large diameter flexible duct of a single ventilator, the interval series local ventilation of the ventilator and the ventilator parallel local ventilation technolog y would be the most common long distance local ventilation technology.