CaSO4(1/2)H2O/CaSO4系熱化学反応サイクルの化学蓄熱への応用に関する基礎研究

概要

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For the purpose of thermal energy storage at relatively low temperature around 373 K, the following gas-solid reaction cycle in which both an exothermic (hydration) and an endothermic (dehydration) process are involved was chosen and was studied from a fundamental point of view concerning its reaction equilibrium and reaction kinetics by using a micro-thermobalance equipped with a steam generator. CaSO4+1/2H2O _??_ CaSO4·1/2H2O + 115.6kJ/kg The grain model was applied in order to determine the reaction kinetic parameters such as the reaction rate constants by considering a complex reaction scheme during the course of the hydration of CaSO4 and the dehydration of CaSO4·1/2H2O. As a result, it was found that the reaction order with respect to the steam pressure was 1.0 for both the hydration and the dehydration, and that the reaction rate constant for the hydration of CaSO4 took a maximum value at about 380 K. Further, it was observed that the reaction activity remained almost constant, independently of the repetition of the reaction cycle between hydration and dehydration within the experimental conditions employed. Consequently, it is considered that the CaSO4 · 1/2H2O/CaSO4 thermochemical reaction cycle might be usable for thermal energy storage between 293.2 and 473.2 K, despite its relatively low value of reaction heat among several kinds of reaction candidates.
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