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5th anniversary of the Dept. of Metallurgy and Chemical Technologies of Nosov Magnitogorsk State Technical University
ArticleName Influence of coke size on the performance of a blast furnace equipped with a cone charging device under the conditions of Magnitogorsk Iron and Steel Works
DOI 10.17580/chm.2023.12.04
ArticleAuthor A. S. Kharchenko, S. V. Yudina, S. K. Sibagatullin, A. V. Pavlov
ArticleAuthorData

Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

A. S. Kharchenko, Dr. Eng., Associate Prof., Head of the Dept. of Metallurgy and Chemical Technologies, e-mail: as.mgtu@mail.ru
S. V. Yudina, Postgraduate Student, Dept. of Metallurgy and Chemical Technologies, e-mail: yudinasv1478@mail.ru
S. K. Sibagatullin, Dr. Eng., Prof., Dept. of Metallurgy and Chemical Technologies, e-mail: 10tks@mail.ru

Magnitogorsk Iron and Steel Works, Magnitogorsk, Russia

A. V. Pavlov, Cand. Eng., Head of the Blast Furnace Shop

Abstract

The operation of a blast furnace of Magnitogorsk Iron and Steel Works, equipped with a conical charging device, was studied when the equivalent surface coke size changed. An increase in coke size was achieved by increasing the content of classes 60–80 and +80 mm. In the base periods, the equivalent surface coke size averaged 53.0 mm, in the experimental periods - 54.7 mm. An increase in the equivalent coke size was ensured under constant loading conditions. Analysis of the research results showed that an increase in the equivalent surface size of coke, in addition to an increase in its cold and hot strength indicators, was accompanied by: improvement of the drainage capacity of coke in the furnace hearth in terms of DMI (increased on average from 163 to 165.5) and carbon solubility in cast iron (decreased on average from 97.5 to 97.4 %); spontaneous redistribution of coke along the throat radius - the ratio of CO2 content in the central part of the furnace to the ore ridge zone decreased by 21.9 % while the ratio of CO2 content in the peripheral zone of the furnace to the axial zone increased by 7.0 %. As a result, every 1 % (rel.) increase in the equivalent surface size of coke in the range from 53.0 to 54.7 mm was accompanied by a decrease in specific coke consumption by an average of 0.13 % and a decrease in furnace productivity by 0.59 %. To increase the positive effect of coke size on the results of blast furnace smelting, it is advisable to simultaneously use accompanying measures aimed at realizing the benefits of increasing its gas permeability, one of which may be an increase in the load of the peripheral zone with iron ore raw materials.
The article was prepared with the support of the grant of the President of the Russian Federation No. MD-1064.2022.4.

keywords Blast furnace, cast iron, coke quality, coke granulometric composition, coke equivalent surface size
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