Modeling of Limestone Calcination Using Joule Heating

R. Kancharla, and M. Ramakrishna
Padmasri Dr. B.V.Raju Institute of Technology
Narsapur
Medak Dist, AP, India

The limestone calcination reaction is endothermic and will proceed only if the partial pressure of CO2 in the gas above the solid surface is less than the decomposition pressure of the CaCO3. As the reaction is endothermic, the conventional process for calcination uses coal firing in rotary kiln with limestone feed to get the desired temperatures.

Microwave heating of limestone is proposed to increase the temperature of the limestone to the desired levels. In the current work, 3D model was created with microwave heating of a limestone block. Temperature and CO2 concentration profiles were studied with respect to the time. Results from the theoretical model were analysed and compared with the published data on calcination temperatures and CO2 dependency.