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Energies 2017, 10(2), 205; doi:10.3390/en10020205

Technical Feasibility Study of Thermal Energy Storage Integration into the Conventional Power Plant Cycle

School of Engineering, University of Warwick, Coventry CV4 7AL, UK
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Academic Editor: Bahman Shabani
Received: 7 December 2016 / Revised: 20 January 2017 / Accepted: 1 February 2017 / Published: 11 February 2017
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Abstract

The current load balance in the grid is managed mainly through peaking fossil-fuelled power plants that respond passively to the load changes. Intermittency, which comes from renewable energy sources, imposes additional requirements for even more flexible and faster responses from conventional power plants. A major challenge is to keep conventional generation running closest to the design condition with higher load factors and to avoid switching off periods if possible. Thermal energy storage (TES) integration into the power plant process cycle is considered as a possible solution for this issue. In this article, a technical feasibility study of TES integration into a 375-MW subcritical oil-fired conventional power plant is presented. Retrofitting is considered in order to avoid major changes in the power plant process cycle. The concept is tested based on the complete power plant model implemented in the ProTRAX software environment. Steam and water parameters are assessed for different TES integration scenarios as a function of the plant load level. The best candidate points for heat extraction in the TES charging and discharging processes are evaluated. The results demonstrate that the integration of TES with power plant cycle is feasible and provide a provisional guidance for the design of the TES system that will result in the minimal influence on the power plant cycle. View Full-Text
Keywords: thermal energy storage (TES); flexible operation; power plant; efficiency; steam cycle thermal energy storage (TES); flexible operation; power plant; efficiency; steam cycle
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Wojcik, J.D.; Wang, J. Technical Feasibility Study of Thermal Energy Storage Integration into the Conventional Power Plant Cycle. Energies 2017, 10, 205.

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