导叶角度对轴流式气液旋流器分离性能的影响

对于低含液浓度的气液两相流,轴流式气液旋流器具有良好的分离性能。导向叶片的几何尺寸是影响轴流式气液旋流器分离性能的重要因素,对导叶出口角度分别为15、20、25和30°的轴流式气液旋流器的试验研究显示,在稀相时,导叶角度25°的旋流器分离效率最高,导叶角度15°的旋流器分离效率最低,而导叶角度20和30°的旋流器的分离效率介于二者之间。流量一定时,轴流式旋流器的压力降随着导叶角度的增大而降低。研究还发现旋流器分离的临界速度受气体含液浓度影响不大,主要受旋流器结构尺寸的影响,对于一定的导叶角度,分离器的压力降随着流速的增加呈抛物线上升,与局部压降公式吻合。

The influence of guide vane angle on the separation performance of axial flow type gas-liquid cyclone

For the low-concentration gas-liquid flow, the axial flow type cyclone has a good separation performance. The geometry of guide vane is the important factor affecting the separation performance of the axial flow type gas-liquid cyclone. The test studies of the axial flow type gas-liquid cyclone with the outlet angles of guide vane of 15°, 20°, 25° and 30° show that in the dilute flow, the separation efficiency of guide vane with angle of 25° is the highest one, and guide vane with angle of 15° is the lowest, and the cyclone’s separation efficiencies of the guide vane with angle of 20° and 30° are between the above two; when the flow rate remains constant, the pressure drawdown of the cyclone decreases with the increase of guide vane angle. The studies also indicate that the separation critical velocity of the cyclone is not affected greatly by the gas concentration, but mainly affected by the cyclone geometry. The pressure drawdown of cyclone with a certain guide vane angle rises at a parabola line with the increase of flow velocity, which matches with the local pressure drawdown formula. Under the condition of low concentration, the variation of liquid-bearing concentration has little effect on the pressure drawdown at a constant flow velocity.