Title

A 3D MULTIPHASE MULTICOMPONENT MATHEMATICAL MODEL OF THE SOLID STATE CARBOTHERMAL REDUCTION OF A SINGLE IRON ORE-BIOMASS PELLET

A 3D MULTIPHASE MULTICOMPONENT MATHEMATICAL MODEL OF THE SOLID STATE CARBOTHERMAL REDUCTION OF A SINGLE IRON ORE-BIOMASS PELLET

Authorship

Medeiros, Giulio Antunes de; Silva, Leonardo Martins da; Castro, Jose Adilson de

Medeiros, Giulio Antunes de

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Silva, Leonardo Martins da

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Castro, Jose Adilson de

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DOI

10.5151/5463-5463-35065

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Abstract

The current blast furnace route for ironmaking moves in the opposite direction of resolutions such as the Kyoto Protocol (1997), a complement to the United Nations Framework Convention on Climate Change (UNFCCC), an international agreement that defines the reduction in the emission of greenhouse gases (CO2, CH4, etc.). The usage of self-reducing pellets in processes like the PTC®, Tecnored®, Itmk3® have shown considerable flexibility regarding the possibility of recycling wastes such as dusts from steelmaking processes and variations of the carbon sources that serve as the reducing agent, allowing the reduction of coke consumption by replacing it by cleaner alternatives such as biomasses. Therefore, the present work aimed to investigate the carbothermal solid state reduction of a single iron ore-biomass composite pellet. For this purpose, we carried out laboratory scale experimental reduction tests and developed a 3D multiphase multicomponent mathematical model based on the coupled mass, chemical species, energy and momentum conservation phenomena for describing the self-reduction process. The experimental results showed that high levels of reduction can be attained using biomass as the reducing carbon source for self-reducing pellets. The developed computational kinetic model exhibited remarkable performance in predicting the extension of the reaction for the iron ore-biomass pellet.

The current blast furnace route for ironmaking moves in the opposite direction of resolutions such as the Kyoto Protocol (1997), a complement to the United Nations Framework Convention on Climate Change (UNFCCC), an international agreement that defines the reduction in the emission of greenhouse gases (CO2, CH4, etc.). The usage of self-reducing pellets in processes like the PTC®, Tecnored®, Itmk3® have shown considerable flexibility regarding the possibility of recycling wastes such as dusts from steelmaking processes and variations of the carbon sources that serve as the reducing agent, allowing the reduction of coke consumption by replacing it by cleaner alternatives such as biomasses. Therefore, the present work aimed to investigate the carbothermal solid state reduction of a single iron ore-biomass composite pellet. For this purpose, we carried out laboratory scale experimental reduction tests and developed a 3D multiphase multicomponent mathematical model based on the coupled mass, chemical species, energy and momentum conservation phenomena for describing the self-reduction process. The experimental results showed that high levels of reduction can be attained using biomass as the reducing carbon source for self-reducing pellets. The developed computational kinetic model exhibited remarkable performance in predicting the extension of the reaction for the iron ore-biomass pellet.

Keywords

Mathematical model; self-reducing pellets; biomass; carbothermal reduction

Mathematical model; self-reducing pellets; biomass; carbothermal reduction