Title

3D MATHEMATICAL MODEL OF SELF-REDUCING IN SHAFT FURNACE

3D MATHEMATICAL MODEL OF SELF-REDUCING IN SHAFT FURNACE

Authorship

D’Abreu, José Carlos; Castro, q José Adilson de; Kohler, Helio Marques; Paco, Lesly Jeaneth Mamani

D’Abreu, José Carlos

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Castro, q José Adilson de

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Kohler, Helio Marques

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Paco, Lesly Jeaneth Mamani

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DOI

10.5151/2594-357X-22437

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Abstract

From a worldwide point of view, the primary iron demand continues to be an important issue, mainly due to the shortage of high quality scraps for the EAF. In this scenario, the emergent self-reduction processes constitute an important alternative supplier to come. The production and performance of cold bonded self-reducing agglomerates, with suitable mechanic and metallurgical properties, will play a fundamental key role to achieve that goal. Focusing those processes, the present work aimed at the development of a mathematical model, finite volume based, to simulate and optimize the operational conditions of the upper zone of a shaft furnace, like the Tecnored reactor. In this upper zone, a granular bed containing self-reducing briquettes, lump coals and an ascending gas flow generated from a secondary tuyère level, is expected to produce a solid rich metalized iron phase. For the simulation performed in this work, the following main conclusions could be drawn: i) high metallization (up to 96%) was only attained at the bottom of the inner part of the zone; ii) regarding the periphery of the zone, a strong inhomogeneity was observed for the solid phases temperature and for the CO and CO2 compositions in the ascending gas; iii) the lower iron metallization, occurred in the peripheral region of the zone, would cause abatements in the overall furnace productivity.

From a worldwide point of view, the primary iron demand continues to be an important issue, mainly due to the shortage of high quality scraps for the EAF. In this scenario, the emergent self-reduction processes constitute an important alternative supplier to come. The production and performance of cold bonded self-reducing agglomerates, with suitable mechanic and metallurgical properties, will play a fundamental key role to achieve that goal. Focusing those processes, the present work aimed at the development of a mathematical model, finite volume based, to simulate and optimize the operational conditions of the upper zone of a shaft furnace, like the Tecnored reactor. In this upper zone, a granular bed containing self-reducing briquettes, lump coals and an ascending gas flow generated from a secondary tuyère level, is expected to produce a solid rich metalized iron phase. For the simulation performed in this work, the following main conclusions could be drawn: i) high metallization (up to 96%) was only attained at the bottom of the inner part of the zone; ii) regarding the periphery of the zone, a strong inhomogeneity was observed for the solid phases temperature and for the CO and CO2 compositions in the ascending gas; iii) the lower iron metallization, occurred in the peripheral region of the zone, would cause abatements in the overall furnace productivity.

Keywords

Mathematical model; Self-reducing; Shaft furnace; Ironmaking.

Mathematical model; Self-reducing; Shaft furnace; Ironmaking.