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很多矿井在调整风量的过程中,都曾发现回风流中绝对瓦斯量随风量增加而增加,甚至有的回采工作面还出现回风流中瓦斯浓度也随风量增加而增加的现象。过去往往把它解释为风量增加井下各点通风绝对压力下降的结果。这对于抽出式通风来说似乎有些道理。但是,在调节压入式通风矿井的风量时,也发生上述现象。显然用井下各点绝对压力变化的观点就无法解释。因此,矿井通风状态变化引起瓦斯涌出量变化的过程中,不仅压力变化起作用,而风量变化(井下各点之间的差压变化)起着更明显的作用。
Many mines in the process of adjusting the air volume, have found that the return air flow in the absolute amount of gas increases with the increase in the amount of wind, and even some face back to the return air flow in the gas concentration also increases with the increase of wind phenomenon. In the past, it was often interpreted as the result of a decrease in the absolute pressure of ventilation at various points down the air volume. This seems plausible for draw-out ventilation. However, the above phenomenon also occurs when adjusting the air volume of a pressure-fed ventilation shaft. Obviously the point of absolute pressure changes with the point of view can not be explained. Therefore, not only the pressure change, but also the change of the air volume (the pressure difference between the downhole points) plays a more obvious role in the change of gas emission caused by the change of mine ventilation status.