化工学报 ›› 2022, Vol. 73 ›› Issue (6): 2589-2602.doi: 10.11949/0438-1157.20220452

• 流体力学与传递现象 • 上一篇    下一篇

鼓泡塔内空气-醋酸体系流体力学参数的CFD-PBM耦合模型数值模拟

张文龙1,2(),宁尚雷1,2,靳海波1,2(),马磊1,2,何广湘1,2,杨索和1,2,郭晓燕1,2,张荣月1,2   

  1. 1.北京石油化工学院新材料与化工学院，北京 102617
    2.燃料清洁化及高效催化减排技术北京市重点实验室，北京 102617
  • 收稿日期:2022-03-30 修回日期:2022-06-01 出版日期:2022-06-05 发布日期:2022-06-30
  • 通讯作者: 靳海波 E-mail:2018520014@bipt.edu.cn;jinhaibo@bipt.edu.cn
  • 作者简介:张文龙（1995—），男，硕士研究生，2018520014@bipt.edu.cn
  • 基金资助:
    国家自然科学基金项目(91634101);北京市属高校高水平教师队伍建设支持计划高水平创新团队建设计划项目(HT20180508)

Numerical simulation of hydrodynamic parameters with air-acetic acid system using CFD-PBM coupled model

Wenlong ZHANG1,2(),Shanglei NING1,2,Haibo JIN1,2(),Lei MA1,2,Guangxiang HE1,2,Suohe YANG1,2,Xiaoyan GUO1,2,Rongyue ZHANG1,2   

  1. 1.College of New Material and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
    2.Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijing 102617, China
  • Received:2022-03-30 Revised:2022-06-01 Published:2022-06-05 Online:2022-06-30
  • Contact: Haibo JIN E-mail:2018520014@bipt.edu.cn;jinhaibo@bipt.edu.cn

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摘要：

通过二维和三维CFD-PBM耦合模型对空气-醋酸体系中流体力学参数进行数值模拟，采用表面张力修正曳力模型与聚并模型，考察了醋酸浓度对鼓泡塔内气含率、气泡大小分布及轴向液速等参数的影响，与差压法、光纤探针和电阻层析成像技术（ERT）测量的实验数据进行了对比，并讨论分析了气含率和气泡直径等流体力学参数的模拟结果。结果表明，醋酸浓度在70%~80%（质量分数）范围内平均气含率存在最大值，且平均气含率的预测值在±10%误差内，三维模拟结果和ERT实验值吻合较好，说明修正后的模型在不同浓度醋酸体系中具有较好的预测性。

关键词: 空气-醋酸体系, 鼓泡塔, 计算流体力学, 两相流, 气含率

Abstract:

In this paper, the influence of the concentration of acetic acid on the hydrodynamic parameters in the bubble column is investigated in the bubble column PX oxidation reactor using two-dimensional and three-dimensional CFD-PBM coupled model. The experimental data are obtained by differential pressure method, fiber optic probe and electrical resistance tomography (ERT) technique, and the simulation results are compared with the experimental values. The drag force model and the coalescence model are corrected by the surface tension term, and the modified model is used for numerical simulation in the acetic acid system with ambient temperature and ambient pressure. The simulation results of the hydrodynamic parameters are analyzed. The results show that when the concentration of acetic acid is in the range of 70%—80%(mass), the average gas holdup has a maximum value. The predicted value of the average gas holdup is within ±10% error, and the three-dimensional simulation results are in good agreement with the ERT experimental value. The modified model has better predictability in acetic acid systems with different concentrations.

Key words: air-acetic acid system, bubble column, computational fluid dynamics, two-phase flow, gas holdup

中图分类号: 

  • TQ 028.8

表1

聚并系数的修正"

Ug/(m/s)Concentration/%(mass)σ/σ0CeαexpαsimError/%
0.047501.441.200.1200.113-6.19
0.071501.441.150.1520.1583.95
0.094501.441.100.1850.2018.65
0.047601.361.150.1390.130-6.92
0.071601.361.100.1740.1771.72
0.094601.361.050.2120.2214.25
0.047701.291.100.1430.141-1.40
0.071701.291.050.1820.1872.75
0.094701.291.000.2200.2325.45
0.047801.201.050.1400.134-6.83
0.071801.201.000.1740.1824.60
0.094801.200.950.2070.2269.17
0.047901.111.000.1210.116-4.13
0.071901.110.950.1600.1653.13
0.094901.110.900.1950.2086.67
0.0471001.000.950.1170.108-7.70
0.0711001.000.900.1530.1551.31
0.0941001.000.850.1930.1993.11

图1

不同质量分数的醋酸物理性质"

图2

不同网格质量对径向气含率的影响"

图3

不同曳力模型和表观气速下径向气含率对比"

图4

不同轴向高度下的径向气含率分布"

图5

空气-醋酸体系下径向气含率分布"

图6

不同醋酸浓度和表观气速下平均气含率分布"

图7

空气-醋酸体系下轴向液速分布"

图8

不同醋酸浓度和表观气速下径向气泡直径分布"

图9

气泡数密度分布（z=0.86 m）"

图10

不同表观气速下不同浓度醋酸横截面气含率云图分布（z = 0.86 m）"

图11

80%醋酸三维柱体气含率分布"

图12

80%醋酸轴向截面气含率云图分布"

图13

不同浓度醋酸不同轴向高度处径向截面气含率云图分布"

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