关键词: 两相流, 空气搅拌, 数值模拟, 种分槽

Abstract: Air-agitated seed precipitation tank is a key facility for the industrial production of alumina and there exist many defects, such as scaling, liquid short-circuiting and so on. In order to overcome these defects, three-dimensional flow field in the tank with different structures is calculated numerically using CFD software. Euler/Euler approach is used to study the effect of structure on the flow field in the tank. Two-fluid model and multi-block gird are adopted in the simulation. The results discussed in this paper are well consistent with the practical situations. The flow field is improved obviously and the rate of scaling is reduced in the optimized tank. With using a gathering sill, the problem of short-circuiting, which always appeared in the upper of the tank, is controlled very well.

Key words: two-phase flow, air-agitating, numerical calculation, seed precipitation tank