可控循环方式主要用于长距离的机械化掘进工作面，或长壁采煤面的超前平巷。它可以调节循环风量、降低粉尘浓度。英国矿山安全研究院（SMRE）早在二十年前就对这一原理作了论述，但现场采用这种局部通风设施的至今只占很小的比重。一个主要原因是采矿工程师们担心循环风会使瓦 Controllable cycle is mainly used for long-distance mechanized heading face, or longwall face ahead of the roadway. It can adjust the circulating air volume and reduce the dust concentration. This principle has been discussed as early as 20 years ago by the British Institute of Mine Safety (SMRE), but the use of such local ventilation in the field has so far accounted for only a small proportion. One of the main reasons is that mining engineers are worried about the circulation wind will make tile