三种典型进气方式对气力提升装置性能影响的试验研究

Experimental Study on the Influence of Three Typical Intake Modes on the Performance of Air Lifting Device

为研究不同进气方式对气力提升装置的影响,建立了一个类似采矿作业现场的试验场地,采用控制单一变量法,对不同进气方式、不同作业方式和不同下降深度的气力提升装置进行了排沙排固效率以及作业方式效率的相关对比。结果表明:在下降深度增加的过程中,轴向边缘进气方式和垂直中心进气方式在不同浸入率下有着不同的效率相等点,效率相等点所对应的下降深度数值也会随着浸入率的增加而增加,而在效率相等点之后,轴向边缘进气方式的气力提升装置效率会超过垂直中心进气方式的气力提升装置效率,占据优势地位。在扬水效率上,无论是何种浸入率下,垂直中心进气方式的效率一直占据效率优势地位。在作业方式中,下降方式的效率占据优势地位。进气速度的不同可改变提升管内流型,且聚泡状流型会使得效率随着沙层深度的增加而减小。

In order to study the influence of different air intake modes on the air lifting device,a test site similar to the mining operation site was established,and a control single variable method was used to compare the efficiency of sand and solid removal and the efficiency of operation mode for air lifting devices under different air intake modes,different operation modes and different descent depths.The results show that in the process of increasing the descent depth,the axial edge air intake mode and the vertical center air intake mode have different efficiency equivalence points under different immersion ratios,the value of the descent depth corresponding to the efficiency equivalence point also increases with the increase of the submergence ratio.After the efficiency equivalence point,the efficiency of the axial edge air intake mode will exceed the efficiency of the vertical center air intake mode,occupying the dominant position.In terms of water lifting efficiency,no matter what kind of immersion ratio is,the efficiency of vertical central air intake mode has always occupied a dominant position.In the operation mode,the efficiency of the descending mode is dominant.Different speed of air intake can change the flow pattern in the lifting pip,and the poly-bubble flow pattern will cause the efficiency decreasing with the increase of sand depth.