Title

DEVELOPMENT OF COMBUSTION AND ASH BEHAVIOR OF PULVERIZED COALS INJECTED IN ARCELORMITTAL TUBARÃO BLAST FURNACES

DEVELOPMENT OF COMBUSTION AND ASH BEHAVIOR OF PULVERIZED COALS INJECTED IN ARCELORMITTAL TUBARÃO BLAST FURNACES

Authorship

Gushiken, Jorge Isamu; Silva, Mauro Correa da; Barros, Ricardo Jose Tauffer; Junior, Roberto da Cruz; Rezende, Roney; Osório, Eduardo; Bagatini, Maurício

Gushiken, Jorge Isamu

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Silva, Mauro Correa da

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Barros, Ricardo Jose Tauffer

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Junior, Roberto da Cruz

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Rezende, Roney

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Osório, Eduardo

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Bagatini, Maurício

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DOI

10.5151/2594-357x-0088

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Abstract

One of the most relevant aspects for the success of the PCI technology is the appropriate choice of the coals to be injected. At ArcelorMittal Tubarão, coals are selected based mainly on their chemical analysis and price. It has been shown that these criteria are not enough to guarantee adequate performance of the blast furnaces where the coals are injected into. In the present work, two different coals that presented completely different performances when injected into blast furnaces have been characterized in terms of chemical and petrography analysis, reactivity in CO2 and O2 atmospheres and reactivity of the char in air. The behavior of the ash at high temperatures has been analyzed using X-ray diffraction and scanning electronic microscopy (SEM). The fusibility and the viscosity of the ash have also been determined. The results indicated that the behavior of the ash at high temperatures, particularly in terms of viscosity, plays a significant role in determining the performance of the coals in the blast furnace.

One of the most relevant aspects for the success of the PCI technology is the appropriate choice of the coals to be injected. At ArcelorMittal Tubarão, coals are selected based mainly on their chemical analysis and price. It has been shown that these criteria are not enough to guarantee adequate performance of the blast furnaces where the coals are injected into. In the present work, two different coals that presented completely different performances when injected into blast furnaces have been characterized in terms of chemical and petrography analysis, reactivity in CO2 and O2 atmospheres and reactivity of the char in air. The behavior of the ash at high temperatures has been analyzed using X-ray diffraction and scanning electronic microscopy (SEM). The fusibility and the viscosity of the ash have also been determined. The results indicated that the behavior of the ash at high temperatures, particularly in terms of viscosity, plays a significant role in determining the performance of the coals in the blast furnace.

Keywords

PCI; Ash viscosity; Blast furnace; Combustion.

PCI; Ash viscosity; Blast furnace; Combustion.