Abstract: In order to study the issue of severe dust pollution in high-altitude mine,and taking a poly-metallic ore in Tibet autonomous region as the engineering background,the comparative experiments were carried out to identify the main particle size distribution in high-altitude mine and the theory of gas-solid two-phase flow was used to make numerical simulation on the efficiency of far-pressing-near-absorption(FPNA) ventilation,the best volume of pressed wind and the optimal ratio of absorption air volume to pressed air volume with FLUENT software.The simulation results were contrasted with the on-site tests.The results indicated that the dust was almost ejected at 1 200 s with FPNA system.The best volume of pressed wind was 150 m3/min and the optimal suction ratio was 0.9.Meanwhile,the simulation results were basically consistent with the on-site data with the dust collection efficiency of more than 90%.At this time,the dust mass concentration in the excavation roadway was maintained within 0.5 mg/m3.

Key words: High-altitude mine, Excavation roadway, Far-pressing-near-absorption(FPNA) , Dust distribution, Numerical simulation