Modeling and Optimization of Membrane Process for Salinity Gradient Energy Production
Modeling and Optimization of Membrane Process for Salinity Gradient Energy Production
复制标题
盐度梯度能源生产膜工艺的建模和优化
作者：
Lianfa Song
在常规的压力延迟渗透（PRO）过程中，当膜的进料侧施加液压压力时，通过控制膜两侧的液压压力可以显著提高盐梯度能的产出率。在膜的进料侧加水压力时，可以获得比相同渗透压下更高的水通量。提取液的渗透压不是通过膜吸收水，而是主要用来增加渗透液的液压压力。这样，在相同的盐度梯度下，可以获得比传统PRO高几个数量级的功率密度。结果表明，在最佳条件下，采用现有半透膜对海水和淡水进行处理，可获得远高于经济盈亏平衡点的产能率。
When hydraulic pressure was added on the feed side of the membrane in the otherwise conventional pressure retarded osmosis (PRO) process, the production rate of the salinity gradient energy could be significantly increased by manipulating the hydraulic pressures on both sides of the membrane. With hydraulic pressure added on the feed side of the membrane, much higher water flux could be obtained than that under the osmotic pressure of the same value. The osmotic pressure of the draw solution, instead of drawing water through the membrane, was mainly reserved to increase the hydraulic pressure of the permeate. In this way, orders of magnitude higher power density than that in the conventional PRO can be obtained with the same salinity gradient. At the optimal conditions, it was demonstrated that the energy production rates that were much higher than the economical breakeven point could be obtained from the pair of seawater and freshwater with the currently available semipermeable membranes.