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

 

Comparative study on a physical model of specific features of top blowing through the tip with folded nozzles when blowing single-phase liquids

 

Summary. The aim of the work was to study the nature and peculiarities of the interaction of the lance of the converter lance flowing from the folded nozzles with a liquid bath of single-phase liquid. The study was conducted on the basis of a physical model of the converter with top purge. The design of a folded nozzle consisting of a central cylindrical nozzle and a slit annular nozzle located around it is investigated. A visual and video recording comparative study in comparable operating conditions of the folded nozzle with different design features, in particular, with an additionally deepened central nozzle in the folded nozzle and a protruding central nozzle; with operation of one cylindrical nozzle, four nozzles of identical section and an annular slot nozzle. It is established that the jet flowing from the folded nozzle differs in the possibility of more active interaction with the liquid bath than one cylindrical nozzle and four nozzles of equivalent plane. The depth of penetration of the jet into the bath liquid, the parameters of the formed hole of the jet penetration, the oscillations of the bath were studied. It is established that the peculiarities of crater formation in the liquid, characteristic when using a folded nozzle, are due to the use of a slotted annular part of the nozzle. The wider crater is due to the use of a slotted annular part of the nozzle. It is shown that the structural variants of the folded nozzle with a recessed or protruding central nozzle do not increase either the depth or the width of the formed crater. It is also established that the peculiarities of crater formation in the liquid when using a folded nozzle are due to the use of a slotted annular part of the nozzle. To form the best purge conditions, the slice of the slotted annular part should be flush with the slice of the central nozzle. With this design, the jet pulse is maintained for a longer period compared to the use of only one central nozzle, probably due to the protection of the central jet, and due to its deep penetration properties.

Keywords: oxygen conversion, physical modeling, upper purge, folded nozzle, gas jet, single-phase liquid

 

Reference

Zrazhevskij А.D., Cherniatevych А.G., Sushenko А.V. & Gritsenko А.S. (2014). Sostojanie i dalnejshee sovershenstvovanie konstrukcij kislorodnyh furm v konverternyh tsehah Ukrainy [State and further improvement of oxygen tuyere structures in converter shops of Ukraine]. Metallurgicheskaja i gornorudnaja promyshlennost [Metallurgical and mining industry], 2014, 6, 20-30. [In Russian].

Sushenko А.V. (2009). Sovershenstvovanie i optimizatsija dutevyh rezimov i ustrojstv kislorodnyh konverterov [Improvement and optimization of blowing modes and devices for oxygen converters]. Visnyk Pryazovskogo derzavnogo tehnichnogo universytetu [Reporter of the Priazovskiy State Technical University], 2009, 19, 36-41. [In Russian].

Cherniatevych A.G. (2015). Razrabotka dutevogo i shlakovogo rezimov konverternoj plavki pri verhnej kislorodnoj produvke. Soobshenie 1 [Development of blast and slag modes for converter smelting with overhead oxygen blowing. Report 1]. Metallurgicheskaja i gornorudnaja promyshlennost [Metallurgical and mining industry], 2015, 4, 24-31. ISSN 0543-5749 [In Russian].

Cherniatevych A.G. (2015). Razrabotka dutevogo i shlakovogo rezimov konverternoj plavki pri verhnej kislorodnoj produvke. Soobshenie 2 [Development of blast and slag modes for converter smelting with overhead oxygen blowing. Report 2]. Metallurgicheskaja i gornorudnaja promyshlennost [Metallurgical and mining industry], 2015, 5, 10-18. [In Russian].

Cherniatevych A.G., Nosov К.G. & Brodskij А.S. (1989). Povyshenie effektivnosti kombinirovannoj produvki vanny 250-t konverterov [Increasing the efficiency of combined blowing of a bath of 250-ton converters]. Chernaja metallurgija. Bulleten NTI [Ferrous Metallurgy. Bulletin of Scientific, Technical and Economical Information], 1989, 7, 56-58. [In Russian].

Кazantsev I.G. (1940). Mehanika gazovoj strui v bessemerovskoj vanne [Mechanics of a gas jet in a Bessemer bath]. Stal [Steel], 1940, 1, 16-18. [In Russian].