DOI: 10.52150/2522-9117-2018-32-220-228

Semykin Sergey Ivanovich, PhD (Engin.), Senior Researcher, Institute namedafter 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

Research in a physical model with the top blowing of a gas-dynamic head and jet parameters at blowing of a liquid bath through an annular coaxial slit nozzle

Abstract. The aim of the work is to study the physical model of the gasdynamic head of a gas jet and the parameters of its penetration into the liquid bath of the converter when it flows out of the annular slotted tuyere. The studies were carried out on a «cold» stand on a scale of 1:30 to a 160-m converter (taking into account the criteria of geometrical and physical similarity) using water as a liquid simulating a molten metal. The averaged values of the depth of penetration of the gas stream of the jet at various blowing parameters were estimated. It is noted that when the upper purge through a coaxial slit nozzle with an increase in the pressure of the purge gas, the dynamic pressure of the depth of penetration of the jet increases. The increase in dynamic pressure and the depth of the introduction of a gas jet leads to an increase in the degree of impact on the bath and an increase in the degree of oxygen absorption by the melt. It was shown that, all other things being equal, the operation of a coaxial slit differs by a large impulse of exposure to a liquid than when blowing through an equivalent diameter slot through one centrally located nozzle, especially at pressures above 0.15-0.3 MPa. The possibilities of increasing the efficiency of the top blowing of the converter bath are shown through the use of a slotted coaxial nozzle.
Keywords: converter, top blow, coaxial slit nozzle, gas jet, efficiency.

Reference
1. Chernyatevich A.G. Razrabotka dut’yevogo i shlakovogo rezhimov konverternoy plavki pri verkhney kislorodnoy produvke. Soobshcheniye 1. Metallurgicheskaya i gornorudnaya promyshlennost’. – 2015. – №4. – S. 24–31.
2. Boychenko B.M., Okhotskiy V.B., Kharlashin P.S. Konverternoye proizvodstvo stali. – RIA «Dnepr-VAL». – 2006. – 455 s.
3. Sushchenko A.V. Improving the Design of the Oxygen Lance and the Blowing Regime for BOF Steelmaking in the BOF Shop at the Azovstal Metallurgical Combine. [A.V.Sushchenko, E.O.Tskitishvili,
R.S.Sidorchuk, N.N.Ligus, M.P.Orlichenko]. Metallurgist. – 2014, Volume 57, Issue 9–10, Р. 804–817.
4. Naito K. Behavior of top-blowing lance jet in BOF. [K.Naito, A.Kaizawa, I.Kitagawa, N.Sasaki]. Nippon Steel Technical report no. 104, august 2013, Р 33-40.
5. Markov V.V. Tyagovyye kharakteristiki kol’tsevykh i ploskikh shchelevykh sopel s vnutrenney polost’yu. [V.V.Markov, V.G.Gromov, N.Ye.Afonina, G.D.Smekhov, A.N.Khmelevskiy.] Mekhanika zhidkosti i gaza. Vestnik Nizhegorodskogo universiteta im . I. Lobachevskogo.- 2011.- №3.- S. 971–973.
6. Semenov V.V., Ivanov I.E., Kryukov I.A. Dvukhkonturnoye shchelevoye soplo raketnogo dvigatelya/ Vestnik PNIPU. Aerokosmicheskaya tekhnika. – 2016. – №46. – S.56-72.
7. Cold-gas experiments to study the flow separation characteristics of a dualbell nozzle during its transition modes. [S.B.Verma, R.Stark, C.Nuerenberger-Genin, O.Haidn]. Shock Waves, 2010, vol.20, iss. 3,
P.191-203.
8. Physical and mathematical models of gas-liquid dynamics in BOF converters. [M.Diaz-Cruz, R.D.Morales, O.Olivares, A.Elias]. Steelmaking conference proceeding.-2002. –P. 737-748.
9. Yakovlev Yu.I. Fizicheskoe i matematicheskoe modilirovanie staleplavilnyih protsessov. Voprosyi teorii i praktiki staleplavilnogo proizvodstva: nuchn. Trudyi/ MMI.-M.: Metallurgiya.-1991.-S, 32-44.
10. Characteristics of jet from top-blown lance in converter. [K.I.Naito, Y.Ogawa , T.Inomoto, S.Kitamura, M.Yano]. ISIJ.-2000.-vol.40. –P.23-30
11. Okhotskiy V.B. Modeli metallurgicheskikh system. Dnepropetrovsk: Sistemnyye tekhnologii, 2006.- 287s .
12. Mazumdar D., Еvans J.W. Modeling of steelmaking processes. – Boca Raton, London, New York: CRS Press, Taylor and Francis Group, 2010. – 463 p.
13. Yavoyskiy V.I., Dorofeev G.A., Povh I.L. Teoriya produvki  staleplavilnoy vannyi. – Moskva: Metallurgiya, 1974.-496 s.
14. Jet penetration and bath circulation in the basic oxygen furnace. [R.A.Flinn, R.D.Pehlke, D.R.Glass, P.O.Hays]. Transactions Metallurg. Soc. AIME. 1967. – V. 239. -№ 11.-P. 1776-1791.
15. Ganzer L.A., Protopopov Ye.V., Chernyatevich A.G. Osobennosti verkhney produvki konverternoy vanny struyami s raznym dinamicheskim naporom. Izv. vuzov. Chernaya metallurgiya. – 2004. – №2. – S. 13-16 .
16. Lukhtura F.I., Linnik A.V. O glubine vnedreniya strui okislitelya v rasplav kislorodnogo konvertera. Vístnik Priazovs’kogo derzhavnogo tekhníchnogo uníversitetu. Tekhníchní nauki.-DVNZ «PDTU».- Mariupol’.-2015.-vip. 3.- S. 122-135.
17. Maia B.T., Tavares R.P. Effect of blow parameters in the jet penetration by physical model of BOF converter. Journal of Materials research and Technology.-2014.- vol. 3. iss.3.-P. 244-256 .