颗粒负荷对小型旋风器性能影响的模拟分析

doi:10.16085/j.issn.1000-6613.2019-1018

摘要/Abstract

摘要：

为探究颗粒负荷对小型旋风器内气固两相流动的影响，基于雷诺应力模型（RSM）和欧拉-欧拉方法的混合流模型（Mixture）进行气体-颗粒、颗粒-颗粒的相间耦合计算。采用粒径为0.5～5μm的颗粒组在40L/min、60L/min和80L/min的入口流量下模拟0~3kg/m³的5种不同颗粒浓度工况，通过对比旋风器内纯气相流场和颗粒负荷流场的不同，研究了颗粒的存在对流场的影响；探究了入口流量和浓度变化对旋风器内分离效率和压降特性的影响。基于模型有效性验证的数值模拟结果表明：较高颗粒浓度负荷使旋风器内的气相流场发生显著变化。随着入口流量的增大，旋风器的分离效率先增大后减小，压降呈非线性增大。随着颗粒浓度的增大，旋风器的分离效率逐渐增大，压降先减小后增大。

关键词: 数值模拟, 小型旋风器, 多相流, 离心分离, 压降

Abstract:

To investigate the effect of particle loadings on gas-solid two-phase flow in a small cyclone, the Reynolds stress model (RSM) and multiphase flow mixture model were adopted for the coupling calculation of gas and particles. Five different particle concentrations of 0—3kg/m³ were simulated at the inlet flow rate of 40L/min, 60L/min and 80L/min using a particle size of 0.5—5μm. The influence of the presence of particles on the gas flow field was studied by comparison of pure gas and particle-loaded phase in cyclone. The effects of inlet flows and solid concentrations on separation efficiency and pressure drop characteristics in cyclone were investigated. The simulation results based on the reliability verification showed that the gas flow field has significantly changes at high particle loadings. With the increase of inlet flow, the separation efficiency of the particles in the cyclone increases first and then decreases, while the pressure drop increases nonlinearly. As the particle concentration increases, the separation efficiency increases, while the pressure drop of the cyclone decreases first and then increases.

Key words: numerical simulation, small cyclone, multiphase flow, centrifugation, pressure drop

中图分类号:

TQ051.8

任欢,赵兵涛,王东燊,张芸. 颗粒负荷对小型旋风器性能影响的模拟分析[J]. 化工进展, 2020, 39(3): 882-889.

Huan REN,Bingtao ZHAO,Dongshen WANG,Yun ZHANG. Simulation analysis of the effect of particle loadings on the performance of small cyclone[J]. Chemical Industry and Engineering Progress, 2020, 39(3): 882-889.

图/表 13

图1 旋风器几何尺寸及网格划分（单位：mm）

图2 旋风器压降实验系统

表1 颗粒粒径分布

颗粒粒径/μm	体积分数/%
0.5	1.5
1	16
2	31
5	51.5

表2 颗粒质量负荷

颗粒浓度 /kg·m^-3	颗粒质量负荷/kg·kg^-1
颗粒浓度 /kg·m^-3	Q_in=40L·min^-1	Q_in=60L·min^-1	Q_in=80L·min^-1
0.2	0.012	0.008	0.006
0.5	0.03	0.02	0.015
1	0.06	0.04	0.03
2	0.12	0.08	0.06
3	0.18	0.12	0.09

图3 数学模型验证

图4 网格无关性验证

图5 不同入口颗粒浓度(Cin=0、0.5kg/m3、1kg/m3和2kg/m3)旋风器内气相流场静压、切向和轴向速度的分布云图

图6 不同入口颗粒浓度(Cin=0、0.5kg/m3、1kg/m3和2kg/m3)旋风器在不同截面处气相流场的静压分布线图

图7 不同入口颗粒浓度(Cin=0、0.5kg/m3、1kg/m3和2kg/m3)旋风器在不同截面处气相流场的切向速度分布线图

图8 不同入口颗粒浓度(Cin=0、0.5kg/m3、1kg/m3和2kg/m3)旋风器在不同截面处气相流场的轴向速度分布线图

图9 不同粒径颗粒在不同浓度下的分级效率

图10 不同流量、浓度下颗粒的分离效率

图11 不同入口流量、浓度下的压降

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