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人们一般认为循环风流会使井巷的入风流减少,并且循环风流往往都是污风流,若不加以控制,会污染矿井环境,可能成为瓦斯或粉尘浓度超限的根源。然而,根据有关资料,也有的认为在一定条件下,只要控制恰当,循环风流可用来解决井下某些通风问题。本文以独头巷道通风为例,对循环风流作粗略讨论。循环风流的危害性问题在图1中,设Q_2>Q_1,于是有Q_1-Q_1=ΔQ的循环污风流,与Q_1新风流一道参与工作面的通风。设该工作面的产尘量为C毫克/秒,此粉尘在任一时刻都均匀分布在
It is generally believed that circulating wind will reduce the wind into the roadway, and the circulation of wind flow are often the pollution flow, if not controlled, will pollute the mine environment, gas or dust concentration may become the root causes of overrun. However, according to relevant information, some people think that under certain conditions, as long as the appropriate control, circulation of wind can be used to solve some ventilation problems underground. In this paper, the ventilation of single laneway is taken as an example to make a rough discussion of the circulating air flow. In Figure 1, we assume that Q_2> Q_1, so there is a circulating pollutant flow Q_1-Q_1 = ΔQ, which is involved in the ventilation of the working face together with the Q_1 fresh air flow. Set the working surface of the amount of dust produced C mg / s, the dust evenly distributed at any time in