Energy Storage Science and Technology ›› 2019, Vol. 8 ›› Issue (5): 880-885.doi: 10.12028/j.issn.2095-4239.2019.0046

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Thermodynamic analysis of novel hybrid liquid air energy storage system combined with ORC

BAI Wengang, ZHANG Chun, ZHANG Lei, YANG Yu, ZHANG Yifan, LI Hongzhi   

  1. Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, Shaanxi, China
  • Received:2019-03-29 Revised:2019-04-19 Online:2019-09-01 Published:2019-04-26

Abstract: A novel hybrid liquid air energy storage system(LAES) combined with an organic Rankine cycle (ORC) was proposed to improve the efficiency of a conventional LAES system. The influence of different equipment performance parameters on the thermodynamic characteristics of LAES system was studied using Aspen HYSYS V8.4 process simulation method. The results show that:the influence of isentropic efficiency of cryo-pump and heat exchanger pinch point temperature on LAES system efficiency are small. On the other hand, the effects of isentropic efficiency of turbine and combustor outlet temperature are significant. The LAES system efficiency increases significantly with the increase of the isentropic efficiency of turbine and the combustor outlet temperature. The LAES system efficiency also increases with the increase of the cryo-pump outlet pressure, but the increasing range gradually decreases. The research results can provide important reference and basis for the engineering application and efficiency improvement of LAES system.

Key words: energy storage, liquid air energy storage, thermodynamic characteristic, organic Rankine cycle, Aspen HYSYS

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