Title

TECHNOLOGICAL CHARACTERIZATION OF COALS FOR COKE PLANTS

TECHNOLOGICAL CHARACTERIZATION OF COALS FOR COKE PLANTS

Authorship

Silva, Odilon José da; Araújo, Poliana Cristina; Silva, Nayara Franciele; Guerra, Fernando Bueno; Assis, Paulo Santos

Silva, Odilon José da

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Araújo, Poliana Cristina

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Silva, Nayara Franciele

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Guerra, Fernando Bueno

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Assis, Paulo Santos

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DOI

10.5151/2594-357x-0121

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Abstract

The process of coke production is directly related to the coal quality, since not all coals produce coke of desired quality and in some cases they can damage the ovens of the coke plant. To compensate for the deficiency of individual coals with all the necessary properties, blends of multicomponent coals are used currently in the blast furnace coke production. These coal blends are managed to optimize the quality of the coke and to reduce the raw material cost, that is, the interrelationships of these innumerable factors with those related to the coal nature contribute for the final quality of the coke. Therefore, a developed methodology to characterize the coals becomes an important tool in the selection and blend of coals for blast furnace coke production, aiming at operational stability with higher productivity in the blast furnaces and reduction of the cost of pig iron, since it represents 30% of the plate cost or 40% of the pig iron. A methodology for evaluating the intrinsic characteristics of the coals was developed, aiming at the creation of a model to predict the quality of the coke. For this, the study examined the conventional characterization and analysis of 14 types of individual coals and mixtures that had been collected from the annual planning of coal blend of ArcelorMital Tubarão. It was concluded: - Comparing the coke quality results from INCAR and ArcelorMittal Tubarão, no significant differences were encountered– The biggest differences were restricted to the “M” and “N” blends and to the CSR parameter.

The process of coke production is directly related to the coal quality, since not all coals produce coke of desired quality and in some cases they can damage the ovens of the coke plant. To compensate for the deficiency of individual coals with all the necessary properties, blends of multicomponent coals are used currently in the blast furnace coke production. These coal blends are managed to optimize the quality of the coke and to reduce the raw material cost, that is, the interrelationships of these innumerable factors with those related to the coal nature contribute for the final quality of the coke. Therefore, a developed methodology to characterize the coals becomes an important tool in the selection and blend of coals for blast furnace coke production, aiming at operational stability with higher productivity in the blast furnaces and reduction of the cost of pig iron, since it represents 30% of the plate cost or 40% of the pig iron. A methodology for evaluating the intrinsic characteristics of the coals was developed, aiming at the creation of a model to predict the quality of the coke. For this, the study examined the conventional characterization and analysis of 14 types of individual coals and mixtures that had been collected from the annual planning of coal blend of ArcelorMital Tubarão. It was concluded: - Comparing the coke quality results from INCAR and ArcelorMittal Tubarão, no significant differences were encountered– The biggest differences were restricted to the “M” and “N” blends and to the CSR parameter.

Keywords

Coal; Quality of the coke; Coke plant.

Coal; Quality of the coke; Coke plant.