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Heat Transfer in Fluidized Beds in a Dry Slag Granulation Unit

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Metallurgist Aims and scope

The world’s leading countries develop dry slag granulation units that are capable of producing solid slag granules and recovering the sensible heat of slag. The main element of such units is a granulation chamber where molten slag is atomized and solidified. In this chamber, up to 30% of the sensible heat of the molten slag is extracted. To recover more heat, the solid granules from the granulation chamber should be fed to fluidized beds. The more there are such beds, the better the granulated slag can be cooled and, therefore, the more heat can be recovered. Foreign publications on dry slag granulation do not provide methods for designing fluidized beds for dry slag granulation units. A method for analyzing the heat transfer in fluidized beds during cooling of slag granules by counter airflow is presented. The method allows determining the heat flow from the slag to the air in fluidized beds and the temperatures of the slag and air exiting the fluidized beds. Recommendations on choosing the airflow velocity, the rational mass of slag in one fluidized bed, the number and dimensions of beds and evaluating air pressure losses in fluidized beds are formulated. It is shown that three fluidized beds in a dry slag granulation unit are sufficient to recover up to 92% of the sensible heat of slag.

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Authors and Affiliations

  1. Cherepovets State University, Cherepovets, Russia

    S. V. Lukin, A. V. Fokin & E. M. Il’icheva

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  1. S. V. Lukin
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  2. A. V. Fokin
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  3. E. M. Il’icheva
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Correspondence to S. V. Lukin.

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Translated from Metallurg, Vol. 64, No. 4, pp. 16–29, April, 2020.

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Lukin, S.V., Fokin, A.V. & Il’icheva, E.M. Heat Transfer in Fluidized Beds in a Dry Slag Granulation Unit. Metallurgist 64, 281–287 (2020). https://doi.org/10.1007/s11015-020-00994-x

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  • DOI: https://doi.org/10.1007/s11015-020-00994-x

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