Speaker
Description
The Direct Reduction (DR) of iron ore pellets with syngas or hydrogen is a promising technology to reduce the emission of iron making. The conversion rate of singe pellets to iron has been extensively investigated. A shrinking core model is commonly employed to reproduce the experimental observations.
Though, this model presents an inherent bias by assuming a sharp separation between a fully converted region and a fully unreacted one. In the present study, a porous solid model is proposed. This model solves for the mass balances of the individual gas species and the solid ones assuming a spherical symmetry. The governing equations, the main algorithm and validation cases will be presented. The open-source suite Cantera was integrated in the model. This allows the use of heterogeneous reaction mechanism and facilitates chemical kinetics calculations. The present model also offers a wide flexibility to incorporate complex phenomena such as pellet morphological changes or carbon deposition. Another advantage of the approach is its smooth transition to multidimensional computations. In this way, the reliability of the kinetic and transport models is insured when used in multidimensional CFD-calculations.