旋流脱气性能影响因素的CFD模拟

doi:10.16085/j.issn.1000-6613.2015.06.011

化工进展 ›› 2015, Vol. 34 ›› Issue (06): 1569-1575,1581.DOI: 10.16085/j.issn.1000-6613.2015.06.011

旋流脱气性能影响因素的CFD模拟

王朝阳, 杨强, 许萧, 汪华林

华东理工大学化学工程联合国家重点实验室, 上海 200237

收稿日期:2014-09-29 修回日期:2014-11-01 出版日期:2015-06-05 发布日期:2015-06-05
通讯作者: 杨强,讲师,研究方向为污水处理与资源化。E-mail:qyang@ecust.edu.cn。
作者简介:王朝阳(1991—),男,硕士研究生。
基金资助:
国家自然科学基金(51208200)及中央高校基本科研业务费专项资金(222201313001)项目。

CFD simulation of influence factors of degassing performance of hydrocyclone

WANG Chaoyang, YANG Qiang, XU Xiao, WANG Hualin

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2014-09-29 Revised:2014-11-01 Online:2015-06-05 Published:2015-06-05

摘要/Abstract

摘要： 液体脱气是工业生产环节不可缺少的部分。脱气式旋流器能够在线、快速地进行脱气工作, 但目前发展处于初期阶段, 对于其脱气性能影响因素的探究还不全面。本文采用计算流体动力学(CFD)的方法, 运用流体力学软件Fluent, 在H₂O-CO₂的两相体系、湍流模型采用Reynolds应力模型、多相流模型采用Mixture混合模型的条件下, 对不同柱径比的液体脱气式旋流器进行数值模拟, 利用旋流离心场的离心力和压力梯度对微小气泡进行分离, 获得了对5～50μm不同直径气泡的分离性能以及进口流速对气泡分离性能的影响关系。研究发现, 在一定条件下, 随着柱径比值的增大, 脱气效率总体上先逐渐增大, 超过一个极限值后迅速减小, 但柱径比越大, 越有利于小气泡颗粒的迁移分离;分离效率随着进口流速增加而增加, 到达极限之后效率降低。

关键词: 旋流器, 柱径比, 计算流体力学(CFD), 脱气性能, 进口流速

Abstract: The degassing technology is a necessary part of industrial production. Degassing hydrocyclone can carry on degassing online and quickly. But development of this technology is at an early stage. All-round researches on the factors of performance are lacking. Column-diameter ratio has significant influence on separation performance of degassing hydrocyclone. In this work, the hydrocyclones with different column-diameter ratios were simulated with computational fluid dynamics. A biphasic system consisting of CO₂ and H₂O was used to evaluate separation performance. Calculation was made with the Fluent software, based on the Reynolds stress model and the Mixture model. The influence of bubble size and inlet velocity was also studied. Under the typical operational conditions, overall degassing efficiency was greatly enhanced with the increase of column-diameter ratio. However, efficiency dramatically decreased when column-diameter ratio exceeded a specific limit. This phenomenon could be explained from the aspect of bubble transfer. Transfer and separation of bubbles with small size were greatly enhanced in hydrocyclones with larger column-diameter ratio. With increasing inlet velocity, performance of separation increased until a maximum was reached. After that performance decreased with further increasing inlet velocity.

Key words: hydrocyclone, column-diameter ratio, computational fluid dynamics(CFD), degassing performance, inlet velocity

中图分类号:

TQ051.8

王朝阳, 杨强, 许萧, 汪华林. 旋流脱气性能影响因素的CFD模拟[J]. 化工进展, 2015, 34(06): 1569-1575,1581.

WANG Chaoyang, YANG Qiang, XU Xiao, WANG Hualin. CFD simulation of influence factors of degassing performance of hydrocyclone[J]. Chemical Industry and Engineering Progree, 2015, 34(06): 1569-1575,1581.

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旋流脱气性能影响因素的CFD模拟

CFD simulation of influence factors of degassing performance of hydrocyclone

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