A MODEL FOR REVERSIBLE SOLID GAS REACTIONS SUBMITTED TO TEMPERATURE AND PRESSURE CONSTRAINTS - SIMULATION OF THE RATE OF REACTION IN SOLID GAS REACTOR USED AS CHEMICAL HEAT-PUMP

An unreacted-core model is formulated in the case of a reversible solid-gas reaction and applied to interpretation of the experimental results obtained by microcalorimetry for the MnCl2-NH3 couple. The model gives a close correlation with experimental data and is able to predict the effects of temperature and pressure on grain kinetics. The solution of the thermal balance equation applied to a reactive mixture used in a chemical heat pump, which is composed of reactive salt and an inert binder, is then developed. The thermal parameters are fitted from experimental results obtained from a laboratory reactor. The composition and temperature profiles allow the main rate-limiting phenomena between heat transfer in the reactive mixture and grain kinetics to be determined.