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Entropy 2014, 16(6), 3103-3120; doi:10.3390/e16063103
Article

Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System

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Received: 11 March 2014 / Revised: 25 May 2014 / Accepted: 28 May 2014 / Published: 4 June 2014
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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 compressed air energy storage; combined cycle (CC); process simulation; system optimization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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