減圧下におけるCa(OH)2の熱分解脱水反応の促進

概要

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For rate enhancement of thermal energy storage by means of Ca (OH)2/CaO reversible thermochemical reaction, the dehydration behaviour of Ca (OH)2 was studied under reduced pressure conditions (2.33-101.3 KPa). It was found that the initiation temperature of the dehydration of Ca (OH)2 was lowered by reducing the pressure in the reaction system and that the dehydration rate increased in inverse proportion to the pressure in the system. The overall reaction rate expression under static conditions was obtained by non-isothermal reaction analysis at various constant heating rates. The reaction orders with respect to a solid reactant and to water vapour pressure were found to be 0th and 0.5th, respectively. The apparent rate constant determined was relatively well correlated with the total pressure in the reaction system within the experimental conditions employed in the present study. The enhancement of the dehydration of Ca (OH)2 by reducing the pressure in the reaction system was quantitatively estimated.
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