鼓泡塔内部流场分布特性的实验研究

Experimental Study of Flow Field Distribution in Bubbling Reactor

利用CFD技术对鼓泡塔内流场进行模拟,考察了通气速度为0.02、0.05、0.08、0.11m/s时鼓泡塔内流场的特性,并对计算结果进行分析。研究发现:分布器对不同气速的流体分布作用范围相差不是很大,但分布器对高速流体的阻力明显比低速流体的大,对于消除或减弱中心趋势效果较好。气体在上升过程中气含率逐渐向四周扩散,当经过分布器后气体分布整体相对均匀,故分布器的分布作用比较显著。

The CFD was employed to experimentally simulate the flow field and the flow field characteristics in the bubbling reactor were investigated while the gas inflating speed stayed at 0.02m/s, 0.05m/s, 0. 08m/s and 0. 11 m/s respectively, including the analysis of their calculation results. The results show that the distributor influences less the fluid distribution scope at different gas velocities ; and the distributor＇ s resistance influence on the high-speed fluid becomes bigger than that on the low-speed fluid; the distributor has better effect on eliminating or decreasing the central tendency; when the gas rises, the gas holdup spreads around gradually and then gas distribution becomes relatively uniform after passing through the distributor. The distributor＇ s role becomes very significant.