Energy-Optimal Control of RO Desalination

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• 作者：Larry Gao ; Anditya Rahardianto ; Han Gu ; Panagiotis D. Christofides ; Yoram Cohen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：May 7, 2014
• 年：2014
• 卷：53
• 期：18
• 页码：7409-7420
• 全文大小：601K
• 年卷期：v.53,no.18(May 7, 2014)
• ISSN：1520-5045

文摘

A novel model-based control system for the operation of a spiral-wound RO membrane desalination system was developed with a focus on maintaining energy-optimal operation. The control scheme utilized an operational model for spiral-wound RO desalting with a supervisory controller providing real-time updates of membrane permeability and the appropriate feed pressure set-points for maintaining the target permeate productivity at the lowest feasible specific energy consumption. System RO feed pressure and flow rates were controlled by a lower-level RO controller through adjustment of the RO high pressure feed pump, variable frequency drive, and RO concentrate valve. Seawater desalination tests with an RO plant, capable of permeate productivity up to 18鈥?00 gallons/day, demonstrated effective self-adaptive energy-optimal operation, subject to feed salinity fluctuations, constraints imposed by the system鈥檚 physical limitations (i.e., minimum and maximum feasible operational pressures and flow rates), and the thermodynamic restriction for cross-flow RO operation.