Heat and Mass Transfer Rate of SrCl₂ Ammine Complex Formation Reaction

Abstract

An ammine complex formation reaction with strontium chloride is expected as a reaction of the chemical heat storage system which has high heat release rate and high heat capacity. In this study, the heat release and storage cycles were demonstrated with the packed bed type reactor at the condition of heat source temperature 90 °C and evaporator temperature 0 °C, and the heat release rate was 1.1～1.3 kW per reactant volume. Besides, mass transfer rate, chemical reaction rate, and heat transfer rate were evaluated respectively, and the heat transfer was identified to be the rate-determining step in this reaction system. Then, the heat resistance was quantified by experiments as well as the simulation modeling the thin layer reactant packed bed. As a resu_-3 lt, ₂ the effective thermal conductivity of SrCl₂ packed bed was 0.18 W/m/K and thermal contact resistance was 1/h=2.3×10 m ･K/W.