Title

EVALUATION OF COMBUSTIBILITY OF BIOMASSES AIMING AT BLAST FURNACE INJECTION

EVALUATION OF COMBUSTIBILITY OF BIOMASSES AIMING AT BLAST FURNACE INJECTION

Authorship

Pohlmann, Juliana Gonçalves; Borrego, Ángeles Gómes; Díez, María Antonia; Vilela, Antônio Cezar Faria; Osório., Eduardo

Pohlmann, Juliana Gonçalves

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Borrego, Ángeles Gómes

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Díez, María Antonia

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Vilela, Antônio Cezar Faria

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Osório., Eduardo

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DOI

10.5151/2594-357X-22301

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Abstract

Reduction of CO2 emissions is a subject of increasing interest for the steel industry. Decreasing the consumption of fossil fuels in the blast furnace (BF) is a way to reduce the emissions in integrated steel works. Pulverized coal injection (PCI) is a fundamental technology to decrease the fuel rate in BF. One of the greatest challenges in the reduction of iron ore is the co-injection of mineral coal with other reducing agents, such as biomass, of strategic importance in modern BFs. Wood as source of charcoal has a significant role in Brazilian steel industry. The high combustibility of this fuel/reducing agent is a positive characteristic for its use in PCI. However, a pre-treatment of wood is required meet the needs of a BF PCI fuel. Torrefaction and carbonization improve the energetic characteristics of wood biomass and could favor its utilization in the ironmaking process. It is important to know the combustibility of biomass compared to typical PCI fuels as well as its physical and chemical characteristics for its incorporation to PCI. This work aims to evaluate the combustibility of laboratory-heated biomass, fines of an industrial charcoal and a typical PCI coal in a Drop Tube Furnace (DTF). The combustibility of the fuels prepared in the laboratory under controlled conditions was greater than both the combustibility of the industrial charcoal and the high volatile coal.

Reduction of CO2 emissions is a subject of increasing interest for the steel industry. Decreasing the consumption of fossil fuels in the blast furnace (BF) is a way to reduce the emissions in integrated steel works. Pulverized coal injection (PCI) is a fundamental technology to decrease the fuel rate in BF. One of the greatest challenges in the reduction of iron ore is the co-injection of mineral coal with other reducing agents, such as biomass, of strategic importance in modern BFs. Wood as source of charcoal has a significant role in Brazilian steel industry. The high combustibility of this fuel/reducing agent is a positive characteristic for its use in PCI. However, a pre-treatment of wood is required meet the needs of a BF PCI fuel. Torrefaction and carbonization improve the energetic characteristics of wood biomass and could favor its utilization in the ironmaking process. It is important to know the combustibility of biomass compared to typical PCI fuels as well as its physical and chemical characteristics for its incorporation to PCI. This work aims to evaluate the combustibility of laboratory-heated biomass, fines of an industrial charcoal and a typical PCI coal in a Drop Tube Furnace (DTF). The combustibility of the fuels prepared in the laboratory under controlled conditions was greater than both the combustibility of the industrial charcoal and the high volatile coal.

Keywords

Char; Combustion; PCI; Biomass.

Char; Combustion; PCI; Biomass.