Heat Transfer and CO₂ Gas Flow in Thermal Decomposition of Calcium Carbonate

Abstract

A mathematical model was developed for the decomposition of calcium carbonate sphere. This model involves four processes. The first two processes are chemical reaction in the reaction interface and CO₂ gas pressure flow in the product layer. The other two precesses are heat transfer between gas and particle by radiation and convection and conduction of heat in the product layer in the heat transfer process.
The weight-loss during the decomposition was measured by thermo-balance and variations of temperature were measured at center, surface, and the other points of spherical particle during the decomposition of limestone in CO₂ (1 atm)
.Applying the measured values to the proposed model, four transport parameters were determined. The distributions of temperature and CO₂ pressure in the spherical particle during the decomposition of limestone were predicted by using these parameter for the model, and the rate controlling process was discussed.