碩士 / 國立臺北科技大學 / 化學工程與生物科技系化學工程碩士班 / 107 / Reverse osmosis (RO) is one of the major technologies for desalinating seawater, while pressure retarded osmosis (PRO) is a promising technology for power production. The RO desalination plant has the problems of extensive energy consumption and brine discharge, which can be alleviated by hybridizing the RO process with the PRO process as an integrated RO/PRO system. When the power generated by the PRO unit can provide the energy consumption required for the entire hybrid system, the hybrid system can achieve stand-alone operation for seawater desalination. This study conducts the optimization design of two hybrid membrane osmosis desalination systems (i.e., RO-PRO and PRO-RO systems) that achieve stand-alone operation, and develops their optimal operating strategy with feasibility analysis in the consideration of membrane fouling. First, the rigorous mathematical model of two hybrid systems is constructed. Optimal system design for the hybrid systems under stand-alone operation is obtained through minimizing the specific total membrane area requirement. The result shows that PRO-RO system outperforms RO-PRO system. However, operation of the membrane osmosis process is bound to be affected by membrane fouling. Based on the membrane fouling model, this study explores the effect of membrane fouling on system energy and water production efficiency, and proposes a dynamic adjustment strategy of operational variables to cope with the fouling effects. The optimal operating strategy is obtained by maximizing the water production while the system maintains stand-alone operation. It is found that stand-alone operation is infeasible for the RO-PRO system under membrane fouling condition. Finally, we propose a model predictive control application for the PRO-RO system to instantly compensate for the effects of unknown disturbances and modeling errors on the stand-alone operation of the system. This control approach can effectively maintain the stand-alone operation of PRO-RO system.
| Identifer | oai:union.ndltd.org:TW/107TIT0006A025 |
| Date | January 2019 |
| Creators | KU, HSIAO-PIN, 古曉彬 |
| Contributors | JENG, JYH-CHENG, 鄭智成 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 106 |
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