压力延迟渗透过程水通量的模型与验证

Modeling and verification of water flux in pressure retarded osmosis process(PRO)

近年来,盐差能作为一种来源广泛、储量可观的绿色可再生能源受到广泛关注。其中,压力延迟渗透(pressure retarded osmosis,PRO)是一种基于渗透过程的极具前景的盐差能利用技术。压力延迟渗透过程中的水通量与最终的能量产出密切相关,因此建立水通量模型对该过程的机理研究、系统设计都具有重要意义。初步建立了在考虑浓差极化和反向盐渗透影响时,压力延迟渗透过程的水通量模型,并使用不同浓度Na Cl汲取液(0.5、1和2 mol·L^(-1))进行了实验实证。模型在低渗透压汲取液条件下拟合良好。此外,为了进一步提高拟合精度,从模型推导和实验测定2个方面分别讨论了可能的提高途径。

Recently,salinity gradient power has attracted much attention as an easily managed renewable energy with great potential. The pressure retarded osmosis process（ PRO） is one of the most promising technologies that could be utilized to recover power from differences in salinity. Water flux in PRO impacts power output significantly,thus it is crucial to model it. In this study,a model based on concentration polarization and reverse salt flux was developed and verified in a lab-scale PRO experiment. Na Cl solutions of varying concentration（ 0. 5,1,and 2 mol·L^-1） were used as the draw solution. The model fit the experimental results for a draw solution based on low osmotic pressure well. In order to improve the model,two possible alternatives based on theoretical modeling and experimental testing,were proposed.