Numerical simulation of flow field and optimization of structure parameters of seed precipitation tank for production of alumina^①

来源期刊：中南大学学报(英文版)2005年第2期

论文作者：闫红杰 周孑民 吕子剑 周怀敏

文章页码：229 - 232

Key words：multi-phase flow; air-agitated; numerical simulation; seed precipitation tank

Abstract: In order to overcome the defects of air-agitated seed precipitation, such as scaring, liquid shortcircuiting, the three-dimension flow fields with different structure are numerically simulated by computational fluid dynamics software. Euler/Euler approach was used to study the effects of structure on the flow field in the tank.Multi-fluid model, body-fitted coordinates and multi-block gird were adopted in the simulation. The simulating results are well consonant with the practical situations. The flow field is improved obviously when the flow velocity increases from 0.089 m/s to 0.192 0.300 m/s at the bottom of the optimized tank and therefore the scaring is reduced greatly in the industrial production. With a gathering sill, the problem of short-circuiting, which always appeares in the upper of the tank, can be solved very well.