doi: 10.3850/978-981-08-7614-2_IMPRES041

ABSTRACT

Effective thermal conductivity, permeability and reaction rate of the composite reactant of CaCl₂ and expanded graphite have been measured. From the results of heat transfer experiments it was found that the effective thermal conductivity of the composite reactant is more than ten times larger than granular calcium chloride and strongly affected by void fraction. Permeability measurements show that the Darcy number increases rapidly with decreasing void fraction in the range of ε=0.4 – 0.6. Reaction rate has been measured using a small cell which simulates a part of reactor bed where the reactant is packed between fins of plate-fin heat exchanger. The measured overall reaction rate has been analyzed using a model which is developed by taking account of the influence of adsorption on hydration rate. Then rate parameters obtained in this study are compared to that of granular CaCl₂ in thin packed bed.

Keywords: Gas-solid reaction, Heat transfer, Permeability, Hydration reaction.

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