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Integration of CaO/CaCO3-CaCl2 thermochemical energy storage system with solid oxide iron-air redox battery

机译：Integration of CaO/CaCO3-CaCl2 thermochemical energy storage system with solid oxide iron-air redox battery

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In this paper, a CaO/CaCO3-CaCl2 thermochemical energy storage system (TCES) is integrated with a solid oxide iron-air redox flow battery (SOIARB) by utilization of Aspen Plus. In this system, since calcination is an endo-thermic reaction, outlet Fe of the charge cycle of the battery is heated by exhausted heat from the calcination reactor. On the other hand, carbonation is an exothermic reaction and with the usage of this reactor's heat load the inlet Fe for the discharge cycle of the battery can be preheated. The amount of energy stored in the charge mode of TCES and SOIARB are 11.09 MW and 0.38 MW respectively. Furthermore, a Fortran calculator block is applied to calculate the voltage, current density and power of the battery which are 1.78 V and 845 Am-2 for the charge cycle respectively and the amount of these parameters for the discharge process are 1.7 V and 900 Am-2 correspondingly. Besides, the battery system is capable of generating 52566 kW of power. On the other hand, the released heat load of the discharge cycle of TCES and battery, are 8.5 MW and 0.084 MW correspondingly. 42 % of the heat released in the carbonator reactor can be used to preheat the input Fe of 9 batteries and CO2 power generation. The round-trip efficiency (RTE) for the TCES system, the battery and for the whole system are presented as results which are 77 %, 22 % and 74 % respectively. Sensitivity analyses in terms of the influence of the temperature of the inlet ambient air on the heat load of the battery in both charge and discharge cycles are investigated. Also, the impact of changing the molar ratio of CaCl2/CaCO3 on the amount of energy of the charge and discharge sections is analyzed.

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