Multiscale Coupling of Pore Structure Evolution with Decomposition Kinetics of Limestone

Abstract

The pore structure evolution and reaction characteristics of limestone with different particle sizes during thermal decomposition were investigated experimentally. A kinetic model considering the effect of pore structure evolution was developed to simulate the multiscale coupling of the mesoscale pore structure with the macroscopic transport and microscopic chemical reaction. Over a defined particle size range, the calculated results were in good agreement with the experimental data including the influence of gas diffusion throughout the whole decomposition course. A dimensionless Thiele modulus Th was constructed for assessing the critical point corresponding to the transformation of controlled mechanisms.