Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston

doi:10.1016/j.cjche.2024.06.007

中国化学工程学报 ›› 2024, Vol. 74 ›› Issue (10): 83-91.DOI: 10.1016/j.cjche.2024.06.007

• Full Length Article • 上一篇下一篇

Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston

Zheng Sun¹, Zean Chen¹, Weian Li¹, Yue Wang^2,3, Jing Yang¹

1 School of Resources & Chemical Engineering, Sanming University, Sanming 365004, China;
2 Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3 State Key Laboratory of Chemical Engineering, Tianjin 300072, China

收稿日期:2024-02-06 修回日期:2024-05-05 接受日期:2024-06-11 出版日期:2024-10-28 发布日期:2024-07-06
通讯作者: Yue Wang,E-mail:tdwy75@tju.edu.cn;Jing Yang,E-mail:yjing90@163.com
基金资助:
This research is supported by the Natural Science Foundation of Fujian Province (2023J011020), the Education Department of Fujian Province/Sanming University (JAT220348/B202202), and Sanming University (22YG12, PYT2202).

Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston

Zheng Sun¹, Zean Chen¹, Weian Li¹, Yue Wang^2,3, Jing Yang¹

1 School of Resources & Chemical Engineering, Sanming University, Sanming 365004, China;
2 Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3 State Key Laboratory of Chemical Engineering, Tianjin 300072, China

Received:2024-02-06 Revised:2024-05-05 Accepted:2024-06-11 Online:2024-10-28 Published:2024-07-06
Contact: Yue Wang,E-mail:tdwy75@tju.edu.cn;Jing Yang,E-mail:yjing90@163.com
Supported by:
This research is supported by the Natural Science Foundation of Fujian Province (2023J011020), the Education Department of Fujian Province/Sanming University (JAT220348/B202202), and Sanming University (22YG12, PYT2202).

摘要/Abstract

摘要： The isobaric energy recovery device can significantly reduce the energy consumption of the seawater reverse osmosis system by recycling the residual pressure energy of high-pressure concentrated brine. Three-cylinder valve-controlled energy recovery device (TC-ERD) solves the fluid pulsation of traditional two-cylinder devices, but the use of a “liquid piston” exacerbates the mixing between brine and seawater. Herein, the evolutionary law of “liquid piston” and the relationship between volumetric mixing degree and operating conditions are explored. The results show that the “liquid piston” first axially expands and then gradually stabilizes, isolating the brine and seawater. Additionally, as long as the volume utilization ratio (U_R) of the pressure exchange cylinder remains constant, there will not be much difference in the volumetric mixing degree after stabilization of the “liquid piston” (V_m-max) regardless of changes in the processing capacity (Q) and cycle time (T₀). Therefore, the equation for V_m-max with respect to the operating parameters (Q, T₀) is derived, which can not only predict the V_m-max of the TC-ERD, but also provide an empirical reference for the design of other valve-controlled devices with “liquid piston”. When the V_m-max is 6%, the efficiency of the TC-ERD at design conditions (30 m³·h^-1, 5.0 MPa) is 97.53%.

关键词: Desalination, Energy, Recovery, Mixing, Liquid piston

Abstract: The isobaric energy recovery device can significantly reduce the energy consumption of the seawater reverse osmosis system by recycling the residual pressure energy of high-pressure concentrated brine. Three-cylinder valve-controlled energy recovery device (TC-ERD) solves the fluid pulsation of traditional two-cylinder devices, but the use of a “liquid piston” exacerbates the mixing between brine and seawater. Herein, the evolutionary law of “liquid piston” and the relationship between volumetric mixing degree and operating conditions are explored. The results show that the “liquid piston” first axially expands and then gradually stabilizes, isolating the brine and seawater. Additionally, as long as the volume utilization ratio (U_R) of the pressure exchange cylinder remains constant, there will not be much difference in the volumetric mixing degree after stabilization of the “liquid piston” (V_m-max) regardless of changes in the processing capacity (Q) and cycle time (T₀). Therefore, the equation for V_m-max with respect to the operating parameters (Q, T₀) is derived, which can not only predict the V_m-max of the TC-ERD, but also provide an empirical reference for the design of other valve-controlled devices with “liquid piston”. When the V_m-max is 6%, the efficiency of the TC-ERD at design conditions (30 m³·h^-1, 5.0 MPa) is 97.53%.

Key words: Desalination, Energy, Recovery, Mixing, Liquid piston

Zheng Sun, Zean Chen, Weian Li, Yue Wang, Jing Yang. Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston[J]. 中国化学工程学报, 2024, 74(10): 83-91.

Zheng Sun, Zean Chen, Weian Li, Yue Wang, Jing Yang. Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston[J]. Chinese Journal of Chemical Engineering, 2024, 74(10): 83-91.

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Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston

Mixing characteristics of three-cylinder valve-controlled energy recovery device based on liquid piston

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