CFD simulation and backflow analysis of combined directed valve tray

LIU Jianglin; ZHANG Jiexu; JI Lijun; CHEN Kui; WU Bin; WU Yanyang; ZHU Jiawen

doi:10.11949/j.issn.0438-1157.20151376

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CFD simulation and backflow analysis of combined directed valve tray

更新时间：2025-12-10

- CFD simulation and backflow analysis of combined directed valve tray
- CIESC Journal Issue 5, Pages: 1701-1709(2016)
- 作者机构：
  
  华东理工大学化工学院,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151376
  CLC： Q021.1
- Online First：05 May 2016，
  
  Published：05 May 2016
- 稿件说明：
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LIU Jianglin, ZHANG Jiexu, JI Lijun, et al. CFD simulation and backflow analysis of combined directed valve tray[J]. CIESC Journal, 2016, (5): 1701-1709.
DOI：

LIU Jianglin, ZHANG Jiexu, JI Lijun, et al. CFD simulation and backflow analysis of combined directed valve tray[J]. CIESC Journal, 2016, (5): 1701-1709. DOI： 10.11949/j.issn.0438-1157.20151376.

摘要

精馏塔板上的气液两相流动对传质效率有重要影响。根据实验数据拟合得到平均气含率关联式

将其加入动量源项

采用Fluent软件对1.2 m直径的组合导向浮阀塔板上的气液两相流动进行CFD模拟

考察了塔板上的气液两相流动状况。清液层高度的模拟结果与实验数据关联式相吻合

验证了模拟的正确性。对塔板上液相的非理想流动进行了分析

通过对反向流进行量化和统计计算出反向流体积分数(即反向流体积占塔板总体积的百分比)。3块不同浮阀排布塔板的反向流体积分数时均值的计算结果表明

梯形浮阀和矩形浮阀的排布方式对反向流影响很大

通过合理排布能够使工业塔板的反向流体积分数时均值从22.0%下降到19.4%

降幅达到11.8%。本研究结果可望对塔板的设计和优化提供指导。

Abstract

The flow patterns and hydraulics of gas-liquid flow on a commercial scale distillation tray is of great importance in determining the tray efficiency. Based on experimental data

a new correlation of average gas hold-up was fitted and built in the inter-phase momentum transfer source for CFD simulations. The simulations of combined directed valve trays of 1.2 m air-water system were carried out by Fluent

a commercial CFD software

and the flow pattern characteristics was investigated. The clear liquid height determined from CFD simulations was in good agreement with the predicted results calculated from the correlation in this work

which proved the validity of simulations. Non-ideal flow of liquid phase on the trays was quantified by the backflow volume ratio T

the ratio of backflow volume to total grid volume. The time-averaged values of the backflow volume ratio (Tav) of 3 tray patterns with different arrangements of trapezoidal and rectangular directed valves were calculated respectively. The results showed that the different arrangements of two kinds of valves had remarkable influence on volume fraction of backflow. By reasonable arrangement

Tav could reduce from 22.0% to 19.4% with the decreased backflow volume by 11.8% compared to the industrial tray. This study was expected to provide a guidance for the tray design and optimization.

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