Novolipetsk Iron and Steel Works, Lipetsk, Russia

S. V. Myasoedov, Head of Blast Furnace Shop, e-mail: myasoedov_sv@nlmk.com

V. A. Svinukhov, Senior Expert, NLMK University, e-mail: svinukhov-vladislav@yandex.ru

National University of Science and Technology MISIS, Moscow, Russia

M. A. Baranenko, Senior Lecturer, e-mail: mary1981@list.ru

P. I. Chernousov, Cand. Eng., Associate Prof., e-mail: p.chernou@yandex.ru

The article presents the results of the analysis of the effect of the introduction of fine-fraction coke into the composition of the iron ore part (LRC) of the blast furnace charge on its gas-dynamic characteristics. Despite the lack of a universal loading algorithm, the purposeful introduction of coke nut into iron ore is an effective tool for controlling the gas dynamics of the blast furnace process. A significant variation in specific pressure drops at NLMK’s blast furnaces when using fine-fraction coke is due to the design features of the furnaces and the charge loading systems used. relating the gas pressure drop to the following parameters: layer height, equivalent diameter of the piece, porosity. On the basis of this equation, the gas-dynamic resistivity parameter (OGDS) was calculated. The use of coke nut modifies the iron ore part of the charge: the volume of voids in it increases, and the level of gas-dynamic resistance decreases. A comparative analysis of fractions shows that a fraction of 25–40 mm is more effective in improving the gas-dynamic regime than a finer fraction of 10–25 mm.

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