Performance analysis of a cryogenic liquid air energy storage system coupled with LNG cold utilization and ORC

Abstract Cryogenic liquid air energy storage (LAES) is a physical energy storage technology with significant development. However, conventional systems suffer from problems such as liquefaction throttling loss, insufficient utilization of heat storage capacity, and low electrical efficiency. Therefore, a LAES system coupled with LNG cold utilization and waste heat type ORC (LAES-LNG-ORC) is proposed, which further improves the overall performance of LAES. Analyzed the impact of energy storage pressure and thermal storage temperature on system indicators. The research results show that the cycle efficiency of the optimized LAES-LNG-ORC system can reach 86.2%, which is about 30% higher than the benchmark LAES system; The thermal utilization efficiency is 80.0%; The additional energy increment of the ORC system can achieve an electrical conversion efficiency of 58.1%, which is approximately 5.2% higher than the benchmark LAES system.