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EERA Joint Program on Energy Storage - SP3 on Thermal Energy Storage Common Applications Concentrated solar power (CSP) Flexible and hybrid conventional thermal power plants Industrial waste heat recovery Advanced adiabatic compressed air energy storage (AA-CAES) Industrial process flexibility and energy efficiency in glass, cement and steel industries, etc. Process steam supply from pressurized water storage, a.k.a. Ruths or steam accumulator Regenerator (Cowper) storage in the steelmaking and glass manufacturing Example Applications SHTES systems increase the percentage of solar energy produced by a power plant, improve operating behaviour, and lead to higher utilization of the power block. Depending on the design of the system, the heat transfer fluid (HTF) may serve as the heat source in an evaporator, creating steam which powers a stream turbine which drives a generator, or the HTF may directly vaporized as it passes through the solar field and then pass straight through the turbine without an intermediate heat exchanger. This excess solar thermal energy is currently stored in tanks filled with molten salt as high temperature sensible heat storage medium as shown in Fig. 3 [7]. 1. Solar thermal power plants Fig. 3. A direct steam generation concentrating solar power plant with SHTES [7]. 2. Waste heat valorisation in industrial processes The implementation of a SHTES system to store discontinuous waste heat from the exhaust gas of an electric arc steel re-melting furnaces has been studied [4]. Two packed bed sensible heat TES systems were proposed in order to be used at a temperature range from 315 to 1500 °C in both the operational periods, so to time average the widely fluctuating temperature of the energy source, and in the peaking periods, so to hold energy until the demand arises (Fig. 4). The system proposed was expected to save 0.0227 MW per ton of produced steel. Fig.4. Steel electric arc furnace energy recovery and storage system [4]. 4. Advanced adiabatic compressed air energy storage (AA-CAES). The storage efficiency of an adiabatic CAES plants is reduced by cooling of the air before it enters the cavern, and by reheating the air prior to combustion. In the adiabatic cycle, thermal energy is extracted and stored separately before the compressed air enters the cavern. In such systems (Fig. 6), AA-CAES employs sensible storages to increase the efficiency in the storage of electricity. Fig. 6. Adiabatic CAES plant [9]. References 1. G. Li, 2016. 2. EERA/EASE Roadmap, 2017. 3. M. Lui et al., 2016. 4. L. Miro et al., 2016. 5. P. G. Bergan et al., 2014. 6. A.S. Fleischer, 2015. 7. B. Romero, 2013. 8. C. Bullough et al., 2004. 9. S. Zunft et al., 2017. 10. T. Bauer et al., 2012. http://eera-es.eu/ Contact JP Energy Storage SP3 - Thermal Energy Storage http://eera-es.eu European Energy Research Alliance (EERA) Rue de Namur, 72 1000 Brussels | BelgiumPDF Image | Brochure on Thermal Energy Storage Technologies
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