Abstract:

By using the controlled circulating ventilation to optimize and transform, the problems of weak ventilation, low efficiency of effective air volume, disordered layout of local fan in 1232m midpiece in south side in Mining plant of Nanwenhe river tungsten mining was analyzed. Based on reasonablely selecting parameters of recirculation rate, recirculation air volume and purifying efficiency, it was found that, in the situation, the controlled circulating ventilation could make the air volume increase to 84.66m3／s from 49.45m3／s at the working face that effective dowmcast air keep stable. In traditional ventilation system, the powder consumed increased 5.021 times when air quantity at site increased  to 84.665m3／s from 49.45m3／s, comparatively, when controlled circulating ventilation was used, powder consumed was increased just 1.845 times. In terms of a mining area of capacity of 450 000 tons per year, it was of significance to apply controlled recirculation ventilation technology, which could be expected to obtain good economic benefit.

Key words: underground mining, ventilation problems, controlled recirculation ventilation technology, energy saving