For conventional power plants, the integration of thermal energy storage opens up a\npromising opportunity to meet future technical requirements in terms of flexibility while at the same\ntime improving cost-effectiveness. In the FLEXI- TES joint project, the flexibilization of coal-fired\nsteam power plants by integrating thermal energy storage (TES) into the power plant process is\nbeing investigated. In the concept phase at the beginning of the research project, various storage\nintegration concepts were developed and evaluated. Finally, three lead concepts with different storage\ntechnologies and integration points in the power plant were identified. By means of stationary system\nsimulations, the changes of net power output during charging and discharging as well as different\nstorage efficiencies were calculated. Depending on the concept and the operating strategy, a reduction\nof the minimum load by up to 4% of the net capacity during charging and a load increase by up to 5%\nof the net capacity during discharging are possible. Storage efficiencies of up to 80% can be achieved.
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