down twister

Research on application of downward ventilation to coal mining face in horizontal seam with coal outburst in potential;

近水平突出煤层回采工作面下行通风应用研究

Field experiments using downward ventilation were studied and the gas emission and distribution laws at the goaf working face were discussed.

结果表明,在采用下行通风后,采空区绝对瓦斯涌出量为上行风时的80%,工作面φ(CH4)下降了75%,瓦斯不再超限。

In order to investigate the solid concentrations in the fully developed region of the circulating fluidized bed(CFB)downers,the actual solid concentration was measured by an optical solid concentration probe in a 9.

在较宽的操作条件范围内采用光纤颗粒浓度探头测定了下行管(φ100mm×9。

This paper discussed methane emission,the reasons for methane reduction in up corner,problems should be considered in the condition of change from normal ventilation into downriver ventilation.

对下行通风时瓦斯涌出及下隅角瓦斯减少的原因进行论证,对上行风改为下行风应注意的问题进行了论证。

After finishing the face mining,the down dismantling method is applied for face move.

工作面回采结束后,采用下行拆除的方法进行搬面。