Thermodynamic analysis on the theoretical energy consumption of seawater desalination
- 標題
- Thermodynamic analysis on the theoretical energy consumption of seawater desalination
- 作者
- Hongliang Qian, Zheng Zhou, Lingling Zhang, Fawen Wu, Quanxing Zhang, Zhibing Zhang
- 文件屬性
- 國外期刊
- 知識分類
- 礦物質分離
- 出版年
- 2013
- 刊名
- Desalination
- 關鍵字
- Seawater desalination; Activity coefficients; Osmotic coefficients; TEC; Thermodynamic analysis
- 點閱數
- 2578
摘要
It's well known that there are various methods being used in seawater desalination, which lead to different energy consumptions. However, the theory of thermodynamics reveals that the theoretical energy consumption (TEC, equivalent to the minimum work Wmin) of seawater desalination is only related to the initial and final state. Thermodynamic analysis of the TEC can contribute to the energy-saving of seawater desalination. In this paper, a novel mathematical model is proposed to calculate the TEC of seawater desalination concerning the recovery ratio, by assuming seawater to be aqueous NaCl–MgCl2–MgSO4solution rather than aqueous NaCl solution. The activity coefficients of salts and the osmotic coefficients of water are calculated by the Pitzer model. The effect of ionic strength, recovery ratio, the activity coefficients of salts and the osmotic coefficients of water, seawater substitution on the TEC are also discussed. It is shown that ionic strength, recovery ratio, activity coefficients of salts and osmotic coefficients of water, seawater substitution have their different effects.