Title

A Model for the Direct Reduction Process in Gas-Solid Reactors

A Model for the Direct Reduction Process in Gas-Solid Reactors

Authorship

D'Abreu, José Carlos; Kohler, Hélio Marques; Castro, Luciano Tanure de; Souza, Cássia Cristine de; Bustamante, Mário Espinoza

D'Abreu, José Carlos

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Kohler, Hélio Marques

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Castro, Luciano Tanure de

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Souza, Cássia Cristine de

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Bustamante, Mário Espinoza

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DOI

10.5151/ABM-IRONMAKING-2001-2001215

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Abstract

The Direct Reduction process accounts for about 90% of the DRI world production. This work presents some aspects of a unidimensional mathematical simulation of the Direct Reduction in gas-solid reactors, utilizing a model that takes into account the energy balance, iron oxide in lump and pellet forms, reduction kinetics, as well as the mass, heat, and momentum transfer phenomena. The model was developed applying project operational data and laboratory reduction tests, aiming for a representation of the real operational parameters. For the gases, it calculates the flow rate, temperature, pressure, and composition from the injection to the exhaustion top. The solid phase compositional variations during the different stages of the reduction are also modeled. In the future, this model is expected to be validated in industrial furnaces like MIDREX and HYL.

The Direct Reduction process accounts for about 90% of the DRI world production. This work presents some aspects of a unidimensional mathematical simulation of the Direct Reduction in gas-solid reactors, utilizing a model that takes into account the energy balance, iron oxide in lump and pellet forms, reduction kinetics, as well as the mass, heat, and momentum transfer phenomena. The model was developed applying project operational data and laboratory reduction tests, aiming for a representation of the real operational parameters. For the gases, it calculates the flow rate, temperature, pressure, and composition from the injection to the exhaustion top. The solid phase compositional variations during the different stages of the reduction are also modeled. In the future, this model is expected to be validated in industrial furnaces like MIDREX and HYL.

Keywords

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