National University of Science and Technology “MISiS” (Moscow, Russia):

P. I. Chernousov, Cand. Eng., Associate Professor, e-mail: p.chernou@yandex.ru
R. E. Grishin, Post-graduate Student, e-mail: grane676@gmail.com
A. N. Chikaleva, Post-graduate Student, e-mail: miss.chikaleva@gmail.com

Novolipetsk Steel (Lipetsk, Russia):

S. N. Seregin, Director of the Repair Complex, e-mail: seregin_sn@nlmk.com

An urgent direction of the development of blast-furnace smelting technology is the use of multicomponent fuel-enriched blast of high parameters, in particular, the combined use of natural gas, pulverized coal fuel (PCF) and process oxygen. The object of the research is the blast-furnace process using reducing blowing additives in PJSC “NLMK”. The database of the main indicators of the operation of blast furnaces number 6 and 7 during 2013–2018 has been formed and analyzed. The furnaces operate with similar raw material, parameters of fuel enriched blast and coke consumption. With a change in the consumption of natural gas, PCF and process oxygen, the values of the degree of compensation (the ratio of the consumption of reducing additives to the consumption of process oxygen) are in the range 0,9–1,1. This provides a stable level of values of the theoretical combustion temperature and the amount of reducing components of the hearth gas, a constant level of heating of the hearth, stability of the gas-dynamic melting mode and the consumption of coke. At the same time, different level of development of the processes of indirect (Ri) and direct (rd) reduction in blast furnaces number 6 and 7 indicates a different composition of hearth gases. This circumstance makes it possible to perform correct studies of the features of the blast furnace process in a wide range value of Ri (from 65 to 92%) and rd (from 12 to 42%). It has been established that the mode of blast furnace smelting using natural gas, PCF and process oxygen, characterized by rd values less than 20–25%, is distinguished by the presence of a pronounced extreme dependence of coke consumption and productivity on the parameters of combined blast.

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