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

doi:10.11949/0438-1157.20220452

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

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.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
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 ZHANG^1,²(),Shanglei NING^1,²,Haibo JIN^1,²(),Lei MA^1,²,Guangxiang HE^1,²,Suohe YANG^1,²,Xiaoyan GUO^1,²,Rongyue ZHANG^1,²

^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 Online:2022-06-05 Published:2022-06-30
Contact: Haibo JIN

摘要/Abstract

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

张文龙,宁尚雷,靳海波,马磊,何广湘,杨索和,郭晓燕,张荣月. 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[J]. 化工学报, 2022, 73(6): 2589-2602.

Wenlong ZHANG,Shanglei NING,Haibo JIN,Lei MA,Guangxiang HE,Suohe YANG,Xiaoyan GUO,Rongyue ZHANG. Numerical simulation of hydrodynamic parameters with air-acetic acid system using CFD-PBM coupled model[J]. CIESC Journal, 2022, 73(6): 2589-2602.

图/表 14

表1 聚并系数的修正

Table 1 Correction of the coalescence coefficient

U_g/(m/s)	Concentration/%(mass)	σ/σ₀	C_e	α_exp	α_sim	Error/%
0.047	50	1.44	1.20	0.120	0.113	-6.19
0.071	50	1.44	1.15	0.152	0.158	3.95
0.094	50	1.44	1.10	0.185	0.201	8.65
0.047	60	1.36	1.15	0.139	0.130	-6.92
0.071	60	1.36	1.10	0.174	0.177	1.72
0.094	60	1.36	1.05	0.212	0.221	4.25
0.047	70	1.29	1.10	0.143	0.141	-1.40
0.071	70	1.29	1.05	0.182	0.187	2.75
0.094	70	1.29	1.00	0.220	0.232	5.45
0.047	80	1.20	1.05	0.140	0.134	-6.83
0.071	80	1.20	1.00	0.174	0.182	4.60
0.094	80	1.20	0.95	0.207	0.226	9.17
0.047	90	1.11	1.00	0.121	0.116	-4.13
0.071	90	1.11	0.95	0.160	0.165	3.13
0.094	90	1.11	0.90	0.195	0.208	6.67
0.047	100	1.00	0.95	0.117	0.108	-7.70
0.071	100	1.00	0.90	0.153	0.155	1.31
0.094	100	1.00	0.85	0.193	0.199	3.11

图1 不同质量分数的醋酸物理性质

Fig.1 Physical properties of acetic acid with different mass fractions

图2 不同网格质量对径向气含率的影响

Fig.2 Influence of different mesh quality on radial gas holdup

图3 不同曳力模型和表观气速下径向气含率对比

Fig.3 Comparison of radial gas holdup under different drag force models and superficial gas velocities

图4 不同轴向高度下的径向气含率分布

Fig.4 Radial gas holdup and axial liquid velocity distribution at different column heights

图5 空气-醋酸体系下径向气含率分布

Fig.5 Radial gas holdup distribution with air-acetic acid system

图6 不同醋酸浓度和表观气速下平均气含率分布

Fig.6 Distribution of average gas holdup under different acetic acid concentrations and superficial gas velocities

图7 空气-醋酸体系下轴向液速分布

Fig.7 Axial liquid velocity distribution with air-acetic acid system

图8 不同醋酸浓度和表观气速下径向气泡直径分布

Fig.8 Radial bubble diameter distribution under different acetic acid concentrations and superficial gas velocities

图9 气泡数密度分布（z=0.86 m）

Fig.9 Bubble number density distribution (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）

Fig.10 Cross-section contours of gas holdup distribution of different mass fractions of acetic acid under different superficial gas velocities（z = 0.86 m）

图11 80%醋酸三维柱体气含率分布

Fig.11 Three-dimensional cylinder gas holdup distribution map of 80% acetic acid solution

图12 80%醋酸轴向截面气含率云图分布

Fig.12 Axial-section contours of gas holdup distribution of 80% acetic acid solution

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

Fig.13 Radial-section contour distribution of gas holdup at different axial heights of different mass fractions of acetic acid solution

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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

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

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