Research on Rotational Driving Torque of Rotary Energy Recovery Device in Seawater Reverse Osmosis System

Huang, Dekai; Qian, Zhaohui; Yu, Xinwei; Ye, Tianzhuang; Hou, Qin-fang; Lei, Jiao; Wang, Zhengye; Leng, Jianxing

doi:10.1109/oceanse.2019.8867071

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…The rotary speed of the self-driven RERD changes as the flow rate changes. The mixing rate of the device can be predicted at the design stage using the CFD calculation method and the mathematical model related to the mixing rate combined with the rotary speed change rule, which has been well studied . This method in this research can help optimize the design of the hydraulic self-driven RERD.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of the Mixing Rate and Channel Volume Efficiency of a Self-Driven Rotary Energy Recovery Device in the Reverse Osmosis System

et al. 2023

Ind. Eng. Chem. Res.

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The mixing problem of the rotary energy recovery device (RERD) adversely affects the reverse osmosis desalination process. The influence of working conditions on the inflow length and mixing rate in a self-driven hydraulic RERD was studied by analyzing the mass transfer mechanism in the rotor channels via computational fluid dynamics (CFD) simulation. The feasibility and reliability of the simulation were experimentally verified. Channel volume efficiency was defined to analyze the inflow status of channels and the mixing behavior. The simulation data exhibited a linear relationship between the inflow length and the ratio of the flow rate and rotary speed, and the mixing rate represented the quadratic function of the channel volume efficiency. The results indicated that the proposed mathematical model of the inflow length and mixing rate is valid. This model in conjunction with the variation relationship between the rotary speed and the flow rate of the self-driven RERD can help considerably improve the mixing problem of the RERD in the design stage, thus reducing the testing cost.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, the RERD performance is being investigated in detail. The efficiency, rotary speed, and drive torque of the RERD have been widely studied in recent years. − …”

Section: Introductionmentioning

confidence: 99%

Investigation of the Mixing Rate and Channel Volume Efficiency of a Self-Driven Rotary Energy Recovery Device in the Reverse Osmosis System

et al. 2023

Ind. Eng. Chem. Res.

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“…Jiao et al [22] researched the hydrodynamics of RERD and analyzed the influence of working conditions on the rotor torques through simulation and experiment. Xu et al [23] studied the rotary speed of the hydraulic self-driven rotor and its influencing factors, while Huang et al [24] established the method of speed prediction by flow rate. Mixing occurs in the channels because there is no physical barrier between brine and seawater [25].…”

Section: Innovative Structural Designmentioning

confidence: 99%

“…The wall surface of the rotor will move at a corresponding linear speed while the sleeve wall surface is fixed, and velocity gradient will occur between the parallel plates. Taking each place in the clearance as two infinitesimal parallel plates, the shearing stress is calculated on each small infinitesimal wall surface, and the theoretical formula of resistance torque suffered by the rotor after using surface integral is obtained [23,24]:…”

Section: Formation and Influence Of Lateral Forcementioning

confidence: 99%

“…First, the initial position of the rotor without eccentricity was calculated. The working condition was set with a flow rate of 70 m 3 /h and a pressure of 6 MPa, while the estimated rotary speed of the rotor applied in this paper was 700 rpm (according to Huang's [24] speed prediction method). The lateral force (the lateral outer wall of the rotor was the only component that the lateral force acted on) in the X and Y directions on the rotor at this speed was monitored, and the sampling duration was within one rotating cycle of the rotor, as shown in Figure 7.…”

Section: Lateral Force Pressure Distribution and Fluctuation When Rot...mentioning

confidence: 99%

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Research on the Influence of Lateral Force and Pressure Fluctuation on the Stability of a Rotary Energy Recovery Device in the Desalination System

Ye,

Hu,

Wang

et al. 2024

Water

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The rotary energy recovery device (RERD) plays an important role in reverse osmosis (RO) desalination; however, few investigations on the formation and influence of lateral force on the RERD rotor have been published. The transient characteristics of lateral force and its relationship with pressure distribution and fluctuation in the clearance were analyzed via computational fluid dynamics (CFD) simulation. The clearance pressure distribution and lateral force were quantified under different working conditions. The eccentricity of the rotor, resistance torque and decrease in the rotary speed due to the lateral force were simulated and they were found to change with flow rate and pressure of high-pressure outlet (PHO). A new rotary speed prediction method including the effect of PHO was developed. With the increasing flow rate or PHO, the stability of RERD declined. A design optimization direction was proposed. The variation trends of rotary speed, pressure in the clearance and its fluctuation were verified through experiment. This research provides an explanation why in practice the rotary speed decreases with increasing pressure. The conclusions obtained herein can be of great significance for future research on improving the stability and lifespan and reducing the maintenance consumption of RERD.

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Developmental impediment and prospective trends of desalination energy recovery device

Wang,

Wang

et al. 2024

Desalination

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Research on Rotational Driving Torque of Rotary Energy Recovery Device in Seawater Reverse Osmosis System

Cited by 5 publications

References 8 publications

Investigation of the Mixing Rate and Channel Volume Efficiency of a Self-Driven Rotary Energy Recovery Device in the Reverse Osmosis System

Investigation of the Mixing Rate and Channel Volume Efficiency of a Self-Driven Rotary Energy Recovery Device in the Reverse Osmosis System

Research on the Influence of Lateral Force and Pressure Fluctuation on the Stability of a Rotary Energy Recovery Device in the Desalination System

Developmental impediment and prospective trends of desalination energy recovery device

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