气固两相流在穿越液池过程中气固分离特性数值分析

利用在欧拉-拉格朗日框架下建立的气液固三相流动数学模型,实现气固两相流穿越液池过程中气液固三相流动的数值模拟。模拟结果直观地揭示出了三相流动形态以及颗粒的运动、分离行为过程。通过对颗粒数的统计计算,获得了分级效率曲线及其变化规律。数值模拟结果发现,气固两相流穿越液池过程中的气固分离主要经历了3个分离作用阶段;细小颗粒的分离效率明显低于大粒径颗粒的分离效率,10 μm和1 000 μm粒径颗粒分离效率分别为88.2%和99.8%;随着下降管出口气速和下降管出口静态淹没深度的增加,颗粒分离效率提高,其中小粒径颗粒的分离效率提高明显,而随后受其影响的程度减弱。

Numerical analysis on separation characteristics of gas-solid in process of gas-solid flow passing through pool

A mathematical model of gas-liquid-solid three-phase flow was established in the Euler-Lagrange framework.It was used to study gas-liquid-solid three-phase flow in the process of gas-solid flow passing through pool base on experimental verification.The flow characteristics of gas-liquid-solid three-phase flow were studied and the movement of particles was intuitionistic revealed.The classification efficiency curves were obtained.The results indicate that the process of gas-solid separation involved three stages.The separation efficiency of 10 micron particle or 1 000 micron particle is 88.2% or 99.8%,respectively.With the increasing of the outlet gas velocity and the static submerged depth of downcomer outlet,the separation efficiency increased.Moreover,the effect of these on small particles is more obvious than on big particles.