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采用PV-6D型颗粒测速仪对新型旋风分离器内近壁面颗粒浓度分布进行了实验研究。研究发现:颗粒浓度沿径向分为近壁面的高浓度区和中心的低浓度区,近壁面处颗粒不断聚集,沿筒壁呈螺旋带状向下运动;近壁面颗粒浓度随着入口气速和颗粒浓度的增加而增加,且沿同一螺旋带运动方向,颗粒浓度也逐渐增加;此外,颗粒在筒体截面上的分布规律与液膜分布相似,均存在浓度最大值点,但由于两者受力情况不同导致最大值点所在位置不同。实验还发现,在筒体顶板附近存在“顶灰环”现象,该现象随着入口颗粒浓度和升气管直径的增大而增大,随着入口角度的增大而减小。
The PV-6D particle velocity analyzer was used to study the particle concentration distribution near the wall of the new cyclone. The results show that the particle concentration in the radial direction is divided into high-concentration area near the wall and low-concentration area near the wall. The particles near the wall continue to gather and move down along the wall. The particle concentration near the wall increases with inlet gas velocity And particle concentration increased, and along the same direction of spiral movement, the particle concentration also increased gradually. In addition, the distribution of particles in the cylinder cross section similar to the distribution of liquid film, there are points of maximum concentration, but both Different force conditions lead to the location of the maximum value is different. Experiments also found that there is a phenomenon of “top gray ring ” near the top of the cylinder, which increases with the inlet particle concentration and the diameter of the ascending tube and decreases with the entrance angle.