Thermodynamic analysis of a novel hybrid liquid air energy storage system based on the utilization of LNG cold energy

被引：123
作者：
Zhang, Tong [1 ]
Chen, Laijun [1 ,2 ]
Zhang, Xuelin [1 ]
Mei, Shengwei [1 ,2 ]
Xue, Xiaodai [1 ,2 ]
Zhou, Yuan [3 ]
机构：
[1] Tsinghua Univ, Dept Elect Engn, State Key Lab Control & Simulat Power Syst & Gene, Beijing 100084, Peoples R China
[2] Qinghai Univ, Sch QiDi TUS Renewable Energy, Xining 810016, Qinghai, Peoples R China
[3] Tech Inst Phys & Chem, CAS Key Lab Cryogen, Beijing 100190, Peoples R China
来源：
ENERGY | 2018年 / 155卷
基金：
中国国家自然科学基金;
关键词：
Liquid air energy storage; LNG cold energy; Organic rankine cycle; Thermodynamics analysis; LIQUEFIED NATURAL-GAS; ELECTRICITY PRODUCTION; POWER-PLANTS; WASTE HEAT; CYCLE; EXERGY; OPTIMIZATION; CHALLENGES; RECOVERY; LAES;
D O I：
10.1016/j.energy.2018.05.041
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Liquid air energy storage (LAES) is a promising solution for electricity energy storage and grid load shifting. The storage and application of cold energy can significantly affect the performance of LAES systems. A stable and sufficient source of cold energy in the liquefaction process is the key factor for the stable and efficient operation of an LAES system. Hence, a novel hybrid LAES system combined with organic Rankine cycle (ORC) systems based on the utilization of liquefied natural gas (LNG) cold energy is proposed in this paper. In the charging process, the LNG helps cool the compressed air, and the cold energy of the liquid air and excess compression heat are utilized in a two-stage ORC system to generate additional electricity during the discharging process. A mathematical model comprising energy and exergy analyses was developed to analyze the performance of the proposed system and the influence of key parameters. Compared to standalone LAES systems, the cold energy storage system is extremely simplified in the proposed system, and higher electricity storage efficiency and density are obtained. Therefore, the proposed system has a promising prospect in LNG terminals owing to its stability and ease of implementation. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：641 / 650
页数：10
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