Thermodynamic analysis of a thermochemical storage process using a multisalt open fixed bed reactor
Résumé
Thermochemical processes are promising systems for heat storage purpose. Such storage systems involve a reversible chemical reaction between a solid and a gas and one of their development challenge is the choice of the reactive pair. This pair has to fulfill a number of criteria, especially good thermodynamic properties, a good stability, low cost… Nevertheless, at present no reactive material fulfills all of these criteria. However, it can be interesting to combine several reactive pairs in order to take advantage of their respective qualities. This paper investigates the thermodynamic functioning of an open thermochemical reactor containing a fixed bed of several salts. To this end, the sharp front model has been extended to a multisalt thermochemical reactor. This analytical model is based on the hypothesis of reaction fronts moving in the reactive bed crossed by moist air. It allows studying the operating of multi-salts thermochemical reactors, highlighting the interest of such systems and evaluating their reaction times (and therefore the power supplied/received). As an illustration, the case of a reactive bed of two salts (SrBr 2 /CaCl 2) has been studied. This multisalt bed allowed the air temperature increase up to six times compared to that obtained with a reactive bed of only CaCl 2 .
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