Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

doi:10.1016/j.cjche.2020.03.024

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (6): 1504-1513.DOI: 10.1016/j.cjche.2020.03.024

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

Xiong Yu¹, Han Zhou¹, Qiang Zheng¹, Shan Jing¹, Wenjie Lan², Shaowei Li^1,3

1 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum(Beijing), Beijing 102249, China;
3 State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2019-10-16 修回日期:2020-03-03 出版日期:2020-06-28 发布日期:2020-07-29
通讯作者: Shan Jing, Shaowei Li
基金资助:
We gratefully acknowledge the support of the National Natural Science Foundation of China(21776151 and 21576147) for this investigation.

Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

Xiong Yu¹, Han Zhou¹, Qiang Zheng¹, Shan Jing¹, Wenjie Lan², Shaowei Li^1,3

1 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum(Beijing), Beijing 102249, China;
3 State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2019-10-16 Revised:2020-03-03 Online:2020-06-28 Published:2020-07-29
Contact: Shan Jing, Shaowei Li
Supported by:
We gratefully acknowledge the support of the National Natural Science Foundation of China(21776151 and 21576147) for this investigation.

摘要/Abstract

摘要： In this study, a computational fluid dynamics (CFD) method was adopted to calculate axial dispersion coefficients of annular pulsed disc and doughnut columns (APDDCs). Passive tracer was uniformly injected by pulse input at the continuous phase inlet, and its concentration governing equation was solved in liquid-liquidtwo-phase flow fields. The residence time distributions (RTDs) were obtained using the surface monitoring technique. The adopted RTD-CFD method was verified by comparing the axial dispersion coefficient between simulation and experimental results in the literature. However, in pilot-scale APDDCs, the axial dispersion coefficients predicted by the CFD-RTD method were approximately three times larger than experimental results determined by the steady-state concentration profile method. This experimental method was demonstrated to be insensitive to the variation of the axial dispersion coefficient. The CFD-RTD method was more recommended to determine the axial dispersion coefficient. It was found that the axial dispersion coefficient increased with an increase in pulsation intensity, column diameter, and plate spacing, but was little affected by the throughput.

关键词: Axial dispersion, Computational fluid dynamics, Residence time distribution, Annular-pulsed disc and doughnut column

Abstract: In this study, a computational fluid dynamics (CFD) method was adopted to calculate axial dispersion coefficients of annular pulsed disc and doughnut columns (APDDCs). Passive tracer was uniformly injected by pulse input at the continuous phase inlet, and its concentration governing equation was solved in liquid-liquidtwo-phase flow fields. The residence time distributions (RTDs) were obtained using the surface monitoring technique. The adopted RTD-CFD method was verified by comparing the axial dispersion coefficient between simulation and experimental results in the literature. However, in pilot-scale APDDCs, the axial dispersion coefficients predicted by the CFD-RTD method were approximately three times larger than experimental results determined by the steady-state concentration profile method. This experimental method was demonstrated to be insensitive to the variation of the axial dispersion coefficient. The CFD-RTD method was more recommended to determine the axial dispersion coefficient. It was found that the axial dispersion coefficient increased with an increase in pulsation intensity, column diameter, and plate spacing, but was little affected by the throughput.

Key words: Axial dispersion, Computational fluid dynamics, Residence time distribution, Annular-pulsed disc and doughnut column

Xiong Yu, Han Zhou, Qiang Zheng, Shan Jing, Wenjie Lan, Shaowei Li. Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns[J]. 中国化学工程学报, 2020, 28(6): 1504-1513.

Xiong Yu, Han Zhou, Qiang Zheng, Shan Jing, Wenjie Lan, Shaowei Li. Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns[J]. Chinese Journal of Chemical Engineering, 2020, 28(6): 1504-1513.

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Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

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