碩士 / 國立臺北科技大學 / 化學工程研究所 / 105 / It is recognized that potable water and energy are gradually insufficient for human needs. To exploit sustainable resources, technologies have been developed to desalinate seawater and produce power using salinity gradient. Reverse osmosis (RO) is one of the major technologies for desalinating seawater, while pressure retarded osmosis (PRO) is a promising technology for power production. In this study, RO and PRO processes are integrated to design stand-alone RO desalination systems powered by the PRO technology. Two configurations of hybrid osmosis processes (i.e., RO-PRO and PRO-RO) without/with recirculation of streams are considered and their performance is assessed. First, the system is analyzed as a thermodynamic cycle and the RO water recovery ratio as a function of several dimensionless operational variables for stand-alone condition is analytically derived. Then, a study of RO and overall water recovery ratios of the hybrid osmosis systems under various operational conditions is carried out. The results show that the PRO-RO system achieves higher water recovery ratios than the RO-PRO system. Furthermore, analysis of the actual hybrid osmosis systems is also carried out by considering the rigorous mathematical models of RO and PRO process. It is found that the water recovery ratios of the actual hybrid osmosis systems are considerably lower than those calculated from thermodynamic analysis, and the PRO-RO system still outperforms the RO-PRO system in terms of water recovery. Finally, optimal designs of the stand-alone desalination system are obtained by maximizing the water recovery ratio and the annual capital costs of these optimal systems are evaluated. The result shows that the optimal PRO-RO system without recirculation by maximizing overall water recovery has the lowest annual capital cost.
| Identifer | oai:union.ndltd.org:TW/105TIT05063061 |
| Date | January 2017 |
| Creators | Heng-Yi Chu, 朱恆毅 |
| Contributors | Jyh-Cheng Jeng, 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 | 103 |
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