Abstract: Compressed air energy storage (CAES) is a commercial, utility-scale technology that provides long-duration energy storage with fast ramp rates and good part-load operation. It is a promising storage technology for balancing the large-scale penetration of renewable energies, such as wind and solar power, into electric grids. This study proposes a CAES-CC system, which is based on a conventional CAES combined with a steam turbine cycle by waste heat boiler. Simulation and thermodynamic analysis are carried out on the proposed CAES-CC system. The electricity and heating rates of the proposed CAES-CC system are lower than those of the conventional CAES by 0.127 kWh/kWh and 0.338 kWh/kWh, respectively, because the CAES-CC system recycles high-temperature turbine-exhausting air. The overall efficiency of the CAES-CC system is improved by approximately 10% compared with that of the conventional CAES. In the CAES-CC system, compressing intercooler heat can keep the steam turbine on hot standby, thus improving the flexibility of CAES-CC. This study brought about a new method for improving the efficiency of CAES and provided new thoughts for integrating CAES with other electricity-generating modes.
Keywords: compressed air energy storage; combined cycle (CC); process simulation; system optimization
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Liu, W.; Liu, L.; Zhou, L.; Huang, J.; Zhang, Y.; Xu, G.; Yang, Y. Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System. Entropy 2014, 16, 3103-3120.
Liu W, Liu L, Zhou L, Huang J, Zhang Y, Xu G, Yang Y. Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System. Entropy. 2014; 16(6):3103-3120.
Liu, Wenyi; Liu, Linzhi; Zhou, Luyao; Huang, Jian; Zhang, Yuwen; Xu, Gang; Yang, Yongping. 2014. "Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System." Entropy 16, no. 6: 3103-3120.