A continuous concentration gradient flow electrical energy storage system based on reverse osmosis and pressure retarded osmosis

被引：27

作者：

Long, Rui ^{[1
]}

Lai, Xiaotian ^{[1
]}

Liu, Zhichun ^{[1
]}

Liu, Wei ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

来源：

ENERGY | 2018年 / 152卷

基金：

中国国家自然科学基金;

关键词：

Reverse osmosis (RO); Pressure retarded osmosis (PRO); Electrical energy storage; REGENERATIVE ELECTROCHEMICAL CYCLE; OSMOTIC HEAT ENGINE; POWER-GENERATION; WASTE HEAT; PERFORMANCE ANALYSIS; DESALINATION SYSTEM; ELECTRODIALYSIS; EFFICIENCY; MEMBRANES; RECOVERY;

D O I：

10.1016/j.energy.2018.04.022

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A continuous concentration gradient flow electrical energy storage system is presented to store the electricity generated by the renewable energy power, which consists of reverse osmosis, generating concentrated salty streams under the external power input, and pressure retarded osmosis, extracting electricity from the produced Gibbs free energy of mixing. The hybrid system is simulated on the module scale under the perfect membrane assumption. The operation parameters that impact the overall performance of the proposed system are systematically investigated. Results reveal that there exist optimal reverse osmosis and pressure retarded osmosis operation pressures leading to a maximum round-trip energy efficiency under given feed solution distribution factor. The distinct thermodynamically limiting operation regimes are identified based on analytical calculation. In the feed limited regime (FLR), a round-trip energy efficiency of 38.27% has been achieved, indicating its potential application of the proposed energy storage system. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：896 / 905

页数：10

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