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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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1 Key Lab of Education Ministry for Power Plant Equipments Conditions Monitoring and Fault Diagnosis, North China Electric Power University, Beijing 102206, China 2 Department of Mechanical and Aerospace Engineering, University of Missouri, E2412 Lafferre Hall, Columbia, MO 65211, USA
* Author to whom correspondence should be addressed.
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 (CC BY 3.0).
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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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