DOI: 10.52150/2522-9117-2018-32-208-219

Molchanov Lavr Sergeevich, PhD (Engin.), Senior Research Scientist, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; ORSID 0000-0001-6139-5956

Chernyatevych Anatoliy Hryhorovych, Dr. Sci., professor, Head of Department, , Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: agchern@ua.fm; ORCID 0000-0002-4552-4997

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, ORCID 0000-0001-7887-2843

Yushkevich Pavlo Olegovich, Ph.D. (Engin.), Researcher, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: metallurgistISI@gmail.com, ORCID 0000-0002-2675-0737

Chubin Maxim Konstantinovich, graduate student, Dniprovsk State Technical University, Dniprobudivska Street, 2, Kamyanske, Dnipropetrovsk Region, Ukraine, 51900

Evaluation of influence of multilevel oxygen lance constructions on blowing efficiency of converter bath with post-combustion of waste gases

Abstract. The aim of the work is to carry out an economic assessment of the effect of various structures of multi-tiered oxygen lances and methods for flushing the converter bath with the afterburning of waste gases on the efficiency of the production of iron-carbon semi-products in a modern metallurgical plant. The study was conducted for the process of steel smelting in converters of combined blowing with supply of oxygen from above and neutral gas through the bottom in the conditions of using conventional and multi-tiered oxygen tuyeres. Studies on the afterburning of converter gas in the converter cavity showed that, in proportion to the increase in the proportion of CO2 in the exhaust gases, the costs of steel production are reduced. Compared with the use of tuyeres of classical construction, they amount to 3.23 US dollars / ton of steel for double-circuit, 6.81 US dollars / ton of steel for bunk, and 11.61 US dollars / ton of steel for three-tier. It was determined that when using the classic design of the upper oxygen tuyere, the lower heat of combustion of the converter gas is 10 MJ / m3. In comparison with the classical design, the two-tier, double-circuit and three-tier tuyeres ensure a reduction in the lower heat of combustion of the converter gas by 8,5; 4.4 and 27.1% (rel.), Respectively. On the basis of the data obtained, it is possible to draw a conclusion about the effectiveness of using the technology of combined blowing of the converter bath with the afterburning of exhaust gases in the converter cavity.
Keywords: converter, bath purge, oxygen lance, afterburning of exhaust gases

Reference
1. Boychenko B.M., Okhot·skyy V.B., Kharlashyn P.S. Konverterne vyrobnytstvo stali: teoriya, tekhnolohiya, yakistʹ stali, konstruktsiyi ahrehativ, retsyrkulyatsiya materialiv i ekolohiya: Pidruchnyk. – Dnipropetrovsʹk: RVA «Dnipro-VAL». – 2004. – 454s.
2. Ryzhavskyy A.Z., Pyrohov A.YU., Zymohlyad A.V. Rekonstruktsyya hazootvodyashchykh traktov bolʹshehruznykh konverterov. Ékolohyya y promyshlennostʹ.-2017.- № 3-4.-S. 4-10.
3. Rabota 130-t konverterov, oborudovannykh dvukhʺyarusnymy furmamy. [V.Y.Baptyzmanskyy, V.O.Kulykov, A.T. Kytaev i dr.]. Ekspressynformatsyya TSNYY y TÉY CHM.- 1974.- seryya 6.- vyp.-3.- S. 1-14.
4. Boychyk I.M. Ekonomika pidpryyemstva: navchalʹnyy posibnyk. – K.: Atika, 2004. – 480c.
5. DSTU 3581 – 97 «Enerhozberezhennya. Metody vymiryuvannya i rozrakhunku teploty z·horyannya palyva» – K.:Derzhstandart Ukrayiny. – 1999. – 12s.
6. Berezhinskiy A.I., Tsimmerman A.F. Okhlazhdeniye i ochistka gazov kislorodnykh konverterov. – M.: Metallurgiya. – 1983. – 272 s.
7. Chernyatevich A.G. Kombinirovannaya produvka metalla s podachey neytral’nogo gaza sverkhu i cherez dnishche konvertera. [A.G.Chernyatevich, R.S.Ayzatulov, L.M.Uchitel’ i dr]. Stal’.- 1989. –№5. –S. 20 – 23.
8. Tubol’tsev L.G. K voprosu povysheniya promyshlennoy bezopasnosti konverterov i ekologicheskoy bezopasnosti protsessov vyplavki stali. [L.G.Tubol’tsev, V.P.Korchenko, V.F.Polyakov i dr]. «Fundamental’nyye i prikladnyye problemy chernoy metallurgii».-2011. – vyp. 24. -S. 258-272
9. Chernyatevich A.G. Vysokotemperaturnoye modelirovaniye produvki konverternoy vanny s ispol’zovaniyem dvukh”yarusnoy kislorodnoy furmy. [A.G.Chernyatevich, V.V.Vakul’chuk, L.S.Molchanov i dr]. Teoriya i praktika metallurgii.- 2017. – № 3-4. –S. 79 – 85.
10. Molchanov L.S., Vakul’chuk V.V. Gazodinamicheskiye osobennosti produvki konverternoy vanny cherez dvukhkonturnuyu furmu. Innovatsionnyye puti modernizatsii bazovykh otrasley promyshlennosti,
energo- i resursosberezheniye, okhrana okruzhayushchey prirodnoy sredy: sbornik nauchnykh trudov VI Mezhdunarodnoy nauchno-prakticheskoy konferentsii molodykh uchenykh i spetsialistov, Khar’kov, 22 – 23 marta 2017 g. – KH.: GP «UkrNTTS «Energostal’».-2017. – S. 102 – 108.
11. Chernyatevich A.G. Termodinamicheskoye i vysokotemperaturnoye modelirovaniye kombinirovannoy produvki konverternoy vanny s ispol’zovaniyem trekh”yarusnoy kislorodnoy furmy. [A.G.Chernyatevich,
L.S.Molchanov, P.O.Yushkevich, M.K.Chubin]. «Fundamental’nyye i prikladnyye problemy chernoy metallurgii». – 2017. – vyp. №31. – S. 110– 121.
12. Krivandin V.A., Yegorov A.V. Teplovaya rabota i konstruktsiya pechey chernoy metallurgii: Uchebnik dlya vuzov. – M.: Metallurgiya, 1989. – 462s.
13. Yefimenko G.G., Gimmel’farb A.A., Levchenko V.Ye. Metallurgiya chuguna – K.: Vysshaya shkola. Glavnoye izdatel’stvo, 1981. – 496 s.
14. Gubinskiy V.I. Metallurgicheskiye pechi: Ucheb. posobiye. – Dnepropetrovsk: NMetAU, 2006. – 85 s.