Development of solid reactant for thermal energy storage and temperature upgrading with carbonation/decarbonation reaction

摘要

Cyclic reaction performances of solid reactants for the CaO-CO{sub}2 chemical heat pump designed for upgrading and storing high-temperature thermal energy were studied. The solid reactants composed of CaO as a reactant and CaTiO{sub}3 as an inertframe work were prepared hy the conventional powder method or the metal alkoxide method. On the experiment of cyclic operation between the carbonation of CaO and the decarbonation of CaCO{sub}3 at 1023K, the reaction reversibility of solid reactants withthe inert CaTiO{sub}3 frame work was steady, whereas that of solid reactant without the inert frame work was decreasing with sintering solid particles during cyclic operation. The reaction rates in the first carbonation and the decarbonation of solidreactant prepared by the alkoxide method were accelerated about 1.8 and 2.4 times faster than those by the powder method, respectively, because of the smaller average diameter of reactant particles derived from the alkoxide method.