螺旋内构件强化排液的泡沫分离塔内上升泡沫的流体力学

Hydrodynamics of rising foam in foam fractionation column with spiral internal components

为了探索带有螺旋内构件的泡沫分离塔强化泡沫排液的机理,对塔内螺旋上升泡沫的流体力学行为进行了研究.结果表明,螺旋通道内泡沫的错流排液和旋转运动是促使气泡聚并加快的主要原因.离心力的存在不利于重力导致的排液,但可使间隙液流到塔壁上进而回流到液池当中.泡沫由竖直通道进入到螺旋通道后,表观液体流速增大而液体分数下降.螺旋通道内表观液体流速和液体分数受气泡大小的影响较大.气泡越大,螺旋构件强化排液的效果越明显.

Hydrodynamics of rising foam in the foam fractionation column with spiral internal components was analysed to get a comprehensive interpretation of foam drainage in the column. The results indicate that the cross-flow foam drainage and rotation of rising foam in the spiral channel contributed to enhancement of bubble coalescence. Centrifugal force went against foam drainage due to the gravity, but it made the entrained liquid flow along the radial direction to the wall of the column. Thus the drained liquid was able to return to the liquid phase along the wall of the column. As rising foam flowing from the vertical channel into the spiral one, superficial liquid flux increased while volumetric liquid faction decreased. Bubble size had a significant effect on both superficial liquid flux and volumetric liquid faction. As bubble size increased, the spiral internal components had greater ability to enhance foam drainage.