Design and analysis of a novel liquefied air energy storage system coupled with coal-fired power unit

• Published in: Journal of energy storage Vol. 73; p. 109204
• Main Authors: Shi, Xingping, He, Qing, Liu, Yixue, Zhang, Qianxu, An, Xugang, Du, Dongmei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.12.2023
• Subjects: Coupling with coal-fired power unit; Design analysis; Economic analysis; Exergy analysis; Liquefied air energy storage; Thermodynamic analysis; Economic analysis; Thermodynamic analysis; Liquefied air energy storage; Coupling with coal-fired power unit; Design analysis; Exergy analysis
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2023.109204

With its large scale and high flexibility, liquefied air energy storage is very suitable for integrated operation with existing power generation systems to improve the regulation ability of the grid. A novel liquified air energy storage system coupled with coal-fired power unit for heat exchange through the water/steam and the compression/expansion air is proposed. The thermodynamic model of a novel liquified air energy storage system is established with a 307 MW coal-fired power unit as the coupling object. And the parameters design and performance analysis of the coupling system are carried out. The results show that the efficiency of the system can reach 51.64 %. At this time, the corresponding energy storage/release pressure is 18/7.2 MPa. The highest return on investment of the system can reach 19.59 %, and the shortest dynamic payback period can reach 4.73 years. The sensitivity analysis shows that decreasing the heat transfer end difference of the regenerator and increasing the adiabatic efficiency of the compressor are conducive to reducing the exergosy destruction of equipment and improving the efficiency of the system. It is beneficial to improve the economic performance of the system to increase the difference between peak and valley electricity prices and the amount of peak regulation subsidy. •A novel LAES system coupled with coal-fired power unit was proposed.•The thermodynamic model of the system was established.•The efficiency of the system is as highly as 51.64 %.•The return on investment and payback period are 19.59 % and 4.73 years, respectively.