Abstract:

In order to study the flow characteristic of gas-liquid-solids three-phase in the process of gas-solids two-phase flow passing through the liquid bath, an experimental platform and a numerical simulation platform based on the Euler-Lagrange method were established respectively to conduct the studies on three-phase flow and particles movement. The distribution characteristics and the movement of three typical particle sizes were obtained, such as 5—15 μm, 80—110 μm and 380—530 μm. The results of experiment were consistent with the results of numerical simulation. A multi-peak distribution of particle concentration existed in the liquid bath along the axial and radial directions. The particles of 5—15 μm in diameter were more easy to follow gas, and their distribution was more uniform. The particles of 380—530 μm in diameter were more difficult to follow gas, and their distribution was mainly concentrated at the bottom of the liquid bath. The increase of static submerged depth of downcomer outlet made the concentration distribution of particles more smoothly in the liquid bath.

Key words: liquid bath, multiphase flow, distribution, numerical simulation

摘要：

为了揭示气固两相流穿越液池过程中的气液固三相流动特性,建立了气液固三相实验平台和基于Euler-Lagrange框架下的数值模拟平台,对该过程中的气液固三相流动过程及颗粒运动分布规律进行研究。获得了5～15 μm、80～110 μm和380～530 μm 3种典型粒径颗粒在三相体系中的微观运动过程及其分布规律。实验与数值模拟结果均能反映出一致的客观规律。研究发现,颗粒浓度沿液池高度方向和径向均呈现多峰分布特征;5～15 μm粒径颗粒更易跟随气体一起穿越液池,其在液池内的浓度分布较为均匀;380～530 μm粒径颗粒与气体的跟随性较差,其浓度峰值主要集中在液池底部。随着下降管出口静态浸没深度的增加,液池内颗粒浓度分布趋于平缓。

关键词: 液池, 多相流, 分布, 数值模拟