Energy recovery from controlled mixing salt and fresh water with a reverse electrodialysis system
Energy recovery from controlled mixing salt and fresh water with a reverse electrodialysis system
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DOI：
10.1021/es8004317
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发表时间：
2008-08-01
影响因子：
11.4
通讯作者：
Buisman, Cees J. N.
中科院分区：
文献类型：
--
作者：
Post, Jan W.;Hamelers, Hubertus V. M.;Buisman, Cees J. N.
从河水和海水混合中获得清洁能源的全球潜力相当大。反向电渗析是一种基于膜的技术，用于从河水和海水的受控混合中直接生产可持续电力。它已被调查，一般集中在获得的功率，而不考虑的能量回收。仅将技术优化为功率输出，通常会产生低能量效率。因此，在本工作中，我们强调了能量回收方面。不存在实现> 80%的能量回收的根本障碍。这个数字是在考虑到不超过离子传输的能量损失的情况下获得的。关于可行性，假设这些内部损失有限是必要但非充分条件。通过减小膜间距离，特别是从充满低传导河水的隔室，可以最小化内部损失。发现从0.5 mm减小到0.2 mm确实可能是有益的，尽管没有达到预期的程度。从内部损耗的评估，据推测，除了隔室厚度，间隔件的几何形状也影响内部电阻。
The global potential to obtain clean energy from mixing river water with seawater is considerable. Reverse electrodialysis is a membrane-based technique for direct production of sustainable electricity from controlled mixing of river water and seawater. It has been investigated generally with a focus on obtained power, without taking care of the energy recovery. Optimizing the technology to power output only, would generally give a low energetic efficiency. In the present work, therefore, we emphasized the aspect of energy recovery. No fundamental obstacle exists to achieve an energy recovery of >80%. This number was obtained with taking into account no more than the energetic losses for ionic transport. Regarding the feasibility, it was assumed to be a necessary but not sufficient condition that these internal losses are limited. The internal losses could be minimized by reducing the intermembrane distance, especially from the compartments filled with the low-conducting river water. It was found that a reduction from 0.5 to 0.2 mm indeed could be beneficial, although not to the expected extent. From an evaluation of the internal losses, it was supposed that besides the compartment thickness, also the geometry of the spacer affects the internal resistance.