Semykin Sergey Ivanovich, PhD (Engin.), Senior Researcher, Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: isisemykin@gmail. com, ORCID 0000-0002-7365-2259
Golub Tetyana Sergeevna, PhD (Engin.), Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: dove@email.ua, ORCID 0000-0001-9269-2953
Dudchenko Sergey Alexandrovich, PhD (Engin.), Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail:s.dudchenko@meta.ua; ORCID 0000-0002-7319-9896
Vakulchuk Vladimir Viktorovich, PhD (Engin.), Research Scientist, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail:vvvakulchuk@gmail.com, ORSID 0000-0001-7887-2843

High-temperature study of the features of metal blowing in the converter
through the top oxygen lance with an annular slit nozzle
Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine

Abstract. The aim of the work is to study on the physical model of an oxygen
converter the interaction of an oxygen jet flowing from a coaxial slotted nozzle with an
iron-carbon melt. During cold modeling of the blowdown, it was found that the gas jet
flowing out of the nozzle along the propagation axis has a large dynamic pressure
compared to the cylindrical nozzle, as a result of which it penetrates deeper into the
liquid. Comparative analysis of video materials obtained during high-temperature
melting revealed gas-dynamic differences in the nature of the interaction of the jet from
the coaxial slit nozzle with the surface of the melt, especially at the beginning of the
melt blowing, when the slag emulsion was not yet formed. Comparison of the results of
high-temperature modeling of the interaction of the oxygen jet flowing from the coaxial
slit nozzle with the metal melt when compared with the work of the four-nozzle tip
showed that earlier ignition of the heat was observed, active absorption of lime and
visually more rigid character of the blowdown with the formation of a smaller amount of
slag than in the comparative melts. The conclusions obtained at the «cold» modeling
stage were confirmed on a higher dynamic head and deep penetration into the jet melt
using an experienced tip. It is revealed that the use of an experienced tip contributes to a
greater heating of the bath and a reduction in the level of dust.
Keywords: converter, high-temperature modeling, top-blowing, coaxial slotted
nozzle, dust extraction
230
«Фундаментальные и прикладные проблемы черной металлургии. – 2018. – Вып.32
«Fundamental and applied problems of ferrous metallurgy». – 2018. – Collection 32
«Fundamental’nye i prikladnye problemy černoj metallurgii». – 2018. – Vypusk 32
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