Науковий вісник НГУ

Energy-efficient solutions of foundry class steelmaking electric arc furnace

User Rating:  / 0
PoorBest

Authors:

S.M.Timoshenko, orcid.org/0000-0003-4221-9978, Donetsk National Technical University, Pokrovsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

M.V.Gubinski, orcid.org/0000-0003-3770-4397, National Metallurgical Academy of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

E.M.Niemtsev, orcid.org/0000-0002-2447-3879, Donetsk National Technical University, Pokrovsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2021, (3): 081 - 087

https://doi.org/10.33271/nvngu/2021-3/081

Abstract:

Purpose.
Substantiation of solutions aimed at reducing heat losses, mainly, by refractory lining during forced downtime and by steelmaking bath in conditions of traditionally low specific power of transformer.

Methodology.
Mathematical modeling of heat and mass transfer processes and numerical experiment.

Findings.
A mathematical model of energy-technological processes in arc furnace workspace has been developed to analyze and minimize energy consumption in daily production cycle. Geometrical and operating parameters are taken into account, in particular: variation in arcs energy efficiency at evolution of wells in charge under electrodes during melting process; circulation of melt due to bubbling with inert gas through bottom porous plug; energy loss on heat accumulation by refractory, with cooling water and off-gas.

Originality.
For the first time, the concept of increasing energy efficiency of arc furnace has been substantiated, based on the following set of solutions: increase in specific electrical power by reducing of charge at given productivity; reduction of bath shape factor (ratio of diameter to depth) from traditional 5 up to 2.5 by deepening and, accordingly, its radiating surface; optimization of walls and roof cooled surface relative area, where massive heat-absorbing refractory lining is not used; application of energy-saving water-cooled elements with spatial structure that promotes formation of heat-insulating and heat-accumulating slag filling.

Practical value.
Implementation of the set of energy-efficient solutions in conditions of typical 6 and 12-t foundry class arc furnaces provides reduction in power consumption and refractory expenditure by 1315 and 2830% respectively without significant changes in production infrastructure due to reducing energy loss, mainly, for accumulation of heat by refractory lining, and intensification of heat and mass transfer processes in forcibly stirred deep bath.

Keywords:
electric arc furnace, energy efficiency, deep bath, heat and mass transfer, water-cooled elements

References.

1. Guo, D., & Irons, J. (2003). Modeling of radiation intensity in an EAF. Third International Conference of CRD in the Minerals and process industry, (pp. 223-228). CSIRO, Melbourne, Australia.

2. Gonsalez, O., Ramirez-Argaez, M., & Conejo, A. (2010). Effect of arc length on fluid flow and mixing phenomena in electric arc furnace. ISIJ International, 50(1), 1-8.

3. Gruber, J-C., Echterhof, T., & Pfeifer, H. (2016). Investigation on the Influence of the Arc Region on Heat and Mass Transport in an EAF Freeboard using Numerical Modeling. Steel research international, 87(1), 15-28. https://doi.org/10.1002/srin.201400513.

4. Kawakami, ., Takatani, R., & Brabie, L. (1999). Heat and mass transfer analysis of scrap melting in steel bath. Tetsu to Hagane, 85(9), 658-665.

5. Li, J., Provatas, N., & Irons, G. (2008). Modeling of scrap melting in the heel of an EAF. Iron & Steel Technology, 5(3), 216-223.

6. Logar, V., Dovan, D., & krjanc, I. (2012). Modeling and validation of an electric arc furnace. ISIJ International, 52(3), 402-423.

7. Opitz, F., & Treffinger, P. (2016). Physics-based modeling of electric operation, heat transfer, and scrap melting in an AC electric arc furnace. Metallurgical and Material Transactions,47,1489-1503. https://doi.org/10.1007/s11663-015-0573-x.

8. Stankevich, Yu., Timoshpolskii, V., Pavlyukevich, N., German,M., & Grinchuk, P. (2009). Mathematical modeling of the heating and melting of the metal charge in an electric arc furnace. Journal of Engineering Physics and Thermophysics, 82(2), 221-235.

9. Mironov, Yu.M., & Petrov, V.G. (2010). Thermal losses and power efficiency of arc steelmaking furnaces. Metally (Russian Metallurgy), 12, 1141-1144.

10. Timoshenko, S., Stovpchenko, A., Kostetski, Yu., & Gubinski, M. (2018). Energy efficient solutions for EAF steelmaking. Journal of Achievements in Materials and Manufacturing Engineering, 88(1), 18-24.

11.Toulouevski, Yu., & Zinurov, I. (2010) Innovation in Electric Arc Furnaces. Scientific Basis for Selection. Berlin (Germany): Springer-Verlag.

12. Biswas, S., Peaslee, K., & Lekakh, S. (2012). Melting energy efficiency in steel foundries. AFS Transactions 2012 American Foundry Society, Schaumburg, Il. USA, 449-456.

13. Timoshenko, S.M., Doroshenko, A.V., Dyadkov, B.P., Tischenko, P.I., & Onischenko, S.P. (2018). Energy-efficient solutions for the modernization of low-tonnage arc furnaces of foundry class. Metall i lyte Ukrayny (Metal and casting of Ukraine), (3-4), 34-40.

14. Timoshenko, S.N. (2016). Computer modeling bath geometry to improve energy efficiency of electric arc furnace. System Technologies. Regional interuniversity collection of scientific works, 3, 33-39.

15. Timoshenko, S.M., & Gubinski, M.V. (2019). Deep bath a way to intensification of heat and mass transfer processes and increase of energy efficiency of the arc steelmaking furnace. Metall i lyte Ukrayny (Metal and casting of Ukraine), (10-12), 8-17.

16. Ghosh, A. (2000). Secondary Steelmaking. Principles and Applications. CRC Press. ISBN 9780849302640.

17. Mazumdar, D., & Guthrie, R.I. (2010). Modeling Energy Dissipation in Slag-Covered Steel Baths in Steelmaking Ladles.Metallurgical and Materials Transactions B,41,976-989.

18. Howell, J., Pinar Meng, M., & Siegel, R. (2016). Thermal Radiation Heat Transfer. CRC Press. Taylor & Francis Group LLC. ISBN-13:978-1466593268. ISBN-10:1466593261.

5389288
Today
This Month
All days
9654
80040
5389288

Guest Book

If you have questions, comments or suggestions, you can write them in our "Guest Book"

Registration data

ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

Contacts

D.Yavornytskyi ave.,19, pavilion 3, room 24-а, Dnipro, 49005
Tel.: +38 (056) 746 32 79.
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.