Configuration optimization of stand-alone Liquid Air Energy Storage for efficiency improvement

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

She, Xiaohui^1 ; Peng, Xiaodong^1 ; Zhang, Tongtong^1 ; Ding, Yulong^1

Birmingham Centre for Energy Storage (BCES), School of Chemical Engineering, University of Birmingham, Birmingham

B15 2TT, United Kingdom^1

关键词: Baseline systems;    Charging process;    Configuration optimization;    Discharging process;    Efficiency improvement;    Energy storage technologies;    Organic Rankine Cycle(ORC);    Working parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012015/pdf
DOI  :  10.1088/1757-899X/502/1/012015

来源: IOP

【 摘 要 】

Liquid Air Energy Storage (LAES) is one of the most potential large-scale energy storage technologies. At off-peak hours, electricity is stored in the form of liquid air at-196 °C (charging process); at peak hours, electricity is recovered through expanding the liquid air (discharging process). It is found that there is excess heat of compression up to 40% in the LAES, which is directly exhausted. To solve the above problem, two configurations are proposed and compared: The first, denoted by Mode-1, is to use the excess heat to drive an Organic Rankine Cycle (ORC); the second, named as Mode-2, is to add two more expansion stages in the discharging process. Effects of different working parameters on the two configurations are studied. Simulation results show that both Mode-1 and Mode-2 have much higher round trip efficiencies than the baseline system, with the maximum improvement of 12% and 8.6%, respectively.