Abstract
The Ca(OH)2 to CaO and water vapor reaction can be reversed and used for thermochemical energy storage, making it a highly promising method for utilizing solar thermal energy and recycling industrial waste heat. In this study, an experimental platform using a pressurized air flow was established to investigate the cyclic performance of the thermochemical energy storage Ca(OH)2/CaO. Then a series of dehydration/hydration experiments which can be used for practical engineering was carried out, and it was found that the dehydration at a temperature exceeding 650 °C can effectively restore the cyclic performance. Subsequently, more than successive 20 cycles at below 650 °C were conducted, and the results show a decrease of 5.9 % in the conversion of the energy storage reaction after 10 cycles, followed by a continuous decrease of 3.6 % in the next 10 cycles. The thermogravimetry (TG) and particle size tests demonstrate that CO2 is the primary factor causing cyclic performance degradation, while an excess temperature of 650 °C can effectively reduce the CaCO3 content in the reactants. This study establishes a basis for the effective implementation of thermochemical energy storage Ca(OH)2/CaO in engineering applications.
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