Optimal operations for large-scale seawater reverse osmosis networks

Jiang, Aipeng; Biegler, Lorenz T.; Wang, Jian; Wen, Chenglin; Ding, Qiang; Jiangzhou, Shu

doi:10.1016/j.memsci.2014.12.005

Cited by 28 publications

(16 citation statements)

References 43 publications

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“…33 A total of 24 subintervals with three collocation points for 1 day are addressed, which is suitable for the dynamic process of the water tank. 33,34,37 The optimal flow structure and control trajectories in 0−24 h can be obtained by solving the formulated MINLP problem.…”

Section: Process Modelingmentioning

confidence: 99%

“…Considering the variation of the recovery ratio, salinity, and temperature, Choi and Kim analyzed the influences of operational parameters on the performance of a full-scale RO system with boron removal. For the research studies provided by refs − , significant cost savings for the RO system could be achieved using the time-of-use power price and buffering effect of the water tank, and the operating conditions can also be adjusted according to the variations of the freshwater demand and seawater temperature. Zhang et al proposed an actual time operation optimization model.…”

Section: Introductionmentioning

confidence: 99%

“…More cost and energy reductions are expected. Some of the operation optimization research studies predefined the size of the system (the number of pressure vessels and the number of membrane modules inside the pressure vessel) and the volume of the water tank, which might not be a better solution. − , The size of the RO system might influence both the water cost and energy consumption . On another hand, the water tank in the RO system should give enough buffer capacity.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Optimization of Size and Operation for Seawater Reverse Osmosis Network with Permeate Split and Interstage Permeate Split Designs

Sun

et al. 2021

Ind. Eng. Chem. Res.

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Simultaneous optimization of size and operation for the seawater reverse osmosis (RO) system is proposed through a superstructurebased mixed-integer differential-algebraic programming approach. The influences of operating conditions on the performance of pumps, RO membrane, and the properties of seawater are considered. The permeate split (PS) design, interstage permeate split (ISPS) design, and on−off model could give more operability and cost saving. For constant feed conditions, nearly constant profiles of control variables are obtained with a larger water tank. The maximum level in a water tank is an indicator to measure its buffer capacity. For the variation of temperature and time-of-use electricity price, although energy consumption can be effectively saved by one time shut off at a large water demand time period with high electricity price, not much water cost is reduced due to the increase of the plant size. Low load operation is an alternative solution. The ISPS design could balance the flux distributions inside the pressure vessel and extract more permeates with high quality; thus, the water cost and energy consumption could be reduced, compared with the interstage design (ISD) and the PS design. The uncertainties of the maximum concentration of product water and the membrane fouling factor are considered in a twostage stochastic program. It is useful for identifying a robust optimal design and operation solutions for membrane-based seawater desalination.

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Section: Process Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous Optimization of Size and Operation for Seawater Reverse Osmosis Network with Permeate Split and Interstage Permeate Split Designs

Sun

et al. 2021

Ind. Eng. Chem. Res.

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“…For such complex systems, model‐based systematic method is a proven approach to shed fundamental understanding on the system level and to reveal optimal routes for process scale‐up, design, and operation. The past decade have seen a plethora of research focusing on system‐level analysis and optimization of RO and RO‐PRO . In particular, the introduction of several dimensionless groups makes it possible to unveil general and scalable relationships among membrane property, feed conditions, operating conditions, and process performance .…”

Section: Introductionmentioning

confidence: 99%

Systematic analysis and optimization of power generation in pressure retarded osmosis: Effect of multistage design

2017

AIChE Journal

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This work presents a systematic method for analysis and optimization of specific energy production (SEP) of pressure retarded osmosis (PRO) systems employing single-stage configuration as well as multistage design with interstage hydro-turbines. It is shown that the SEP normalized by the draw solution feed osmotic pressure increases with the number of stages as well as a dimensionless parameter c tot 5A tot L p p 0 =Q 0 . As compared to the single-stage PRO, the multistage arrangement not only increases flux and volume gain, but also allows a stage-dependent, progressively decreasing hydraulic pressure, both of which contribute to enhanced SEP and power density. At the thermodynamic limit where c tot goes to infinity, the theoretical maximum SEP by an N-stage PRO system is Nð12q 21=N totÞp 0 , where q tot is the ratio of the draw solution flow rate at the outlet to the inlet on the system level. For single-stage PRO, it is no more than p 0 . For infinite number of stages, the theoretical limit becomes ðln q tot Þp 0 . SEP under realistic conditions and practical constraints on multistage design are discussed.

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“…Since the mechanism models of MSF process and SWRO process have been established by our earlier work and can be referred in literatures, the model equations of the MSF and SWRO system that were used in our work were not listed in this paper. The steady-state models of OT-MSF and BR-MSF systems can be seen from Mujtaba [26][27][28], Woldai A [29], Rosso [30], and Gao [31] et al The steady-state mechanism model of the SWRO system can be seen from Jiang [32][33][34], Ma [35], and Cheng [36] et al This paper just shows the different schemes of the hybrid system and the equations to connect the MSF and RO processes, and this is enough to achieve the whole model of the hybrid system under a given coupling structure.…”

mentioning

confidence: 99%

Modeling and Structural Optimization of MSF-RO Desalination System

Jiang

Huang

et al. 2022

Membranes

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Based on the mathematical modeling and operational optimization studies of reverse osmosis (RO) and multistage flash (MSF) desalination, the structural optimization of the hybrid process was specially studied in this work with the consideration of reducing comprehensive expenses under given operational conditions. Firstly, according to the process mechanism and flowchart of the RO and MSF seawater desalination technologies, seven hybrid structures with different feed conditions were designed, and their connection equations were established for numerical calculation. Then, in order to evaluate the economic performance of the hybrid systems with different structures, the hourly average operational cost equations of RO and MSF processes were established and formulated as the comprehensive evaluation indicators. Next, with a given water production requirement, simulation calculations of the hybrid system with seven different structures were performed. The results show that the hybrid system with the fourth structure has the lowest operational cost of 4.6834 CNY/m3, and at the same time it has the lowest blowdown. However, if we take GOR or production water temperature as the target, the optimal structure of the hybrid system is the fifth or the seventh option. The obtained results are helpful in structural optimization of the hybrid system with aspects of operational cost reduction, maximum GOR, or minimizing the wastewater discharge.

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Optimal operations for large-scale seawater reverse osmosis networks

Cited by 28 publications

References 43 publications

Simultaneous Optimization of Size and Operation for Seawater Reverse Osmosis Network with Permeate Split and Interstage Permeate Split Designs

Simultaneous Optimization of Size and Operation for Seawater Reverse Osmosis Network with Permeate Split and Interstage Permeate Split Designs

Systematic analysis and optimization of power generation in pressure retarded osmosis: Effect of multistage design

Modeling and Structural Optimization of MSF-RO Desalination System

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