Abstract:

Compared to sensible and latent heat storage, thermochemical heat storage has a higher heat storage density, achieving seasonal heat storage at ambient temperature. This paper concerns a CaO-Ca(OH)2 heat storage system. A 2D axisymmetric transient model was developed to study the exothermic process of the system, which is essential for reactor design and operation condition optimization. The effect of different reaction conditions and reaction bed parameters on the exothermic process was investigated systematically. The results indicated a rapid reaction zone in the reaction bed with the exothermic reaction moving from the inlet to the outlet. The outlet temperature was mainly influenced by the steam pressure and the reaction exothermic power was mainly influenced by the flow rate. The results also showed that the height of reaction bed had no effect on the maximum reaction exothermic power.

Key words: thermochemical heat storage, calcium hydroxide, numerical computation