¹Iron and Steel Institute of the National Academy of Sciences of Ukraine (Dnipro, Ukraine) ; ²Scientific Technical Company ISD (Dnipro, Ukraine):

Semenov Yu. S., Dr. Eng., Senior Researcher^1,2, e-mail: yuriy.semenov.isi@gmail.com
Horupakha V. V., Researcher^1,2
Shumelchik E. I., Dr. Eng., Senior Researcher^1,2

The peculiarities of blowing of blast furnaces after their stopping of different duration and with different stopping patterns are presented. The main blowing regularities are given taking into account the preparing measures and technological features. The experience of blowing of blast furnaces of Metinvest Holding (Ukraine) is summarized after a long stopping that was not regulated by the technological instruction and that was not accompanied by preliminary tapping of freezing iron. The regulating rules for blowing of blast furnaces after long stopping have been developed. In accordance with the regulations, it is necessary to perform the following technological operations: keeping of the reduced (in comparison with the conventional one) ore load on the volume of the charge; use of low-melting materials with low basicity in the burden of the first volume and the first working batches (including possibility of supplying of lowmelting materials through air tuyeres); use of sector blowing from the iron tap side with a small number of air tuyeres; ensuring of a stable heating along the height “tap — air tuyere” before blowing start (by installing of pipes into the cast iron tap to supply natural gas and air for its combustion); observance of low intensity of increase of gas blowing parameters and opening of air tuyeres in one sector; maintenance of a reduced ore load (in comparison with the accepted one) of ore load of the fi rst working burden with reduced iron content in the charge.

1. Vasyura G. G. Regulation of blast furnace’s thermal state in blowing-up period. Metallurg. 2002. No. 5. pp. 40–42.
2. Inozemtsev N. S., Korshikov G. V., Kaporulin V. V. Cooling and heating of coke checkers during the blowing-ins and blowing-outs. Collection of scientific proceedings of international scientific and technical conference «Modern metallurgy of the beginning of a new millenium». Lipetsk, 2005. pp. 56–60.
3. Yankovskii A. S., Maryasov M. F., Polshchikov A. V., Zhembus M. D., Monarshuk A. P., Zuenok G. A., Borodulin A. V. Blow-through of a blast furnace with the use of nitrogen. Metallurgist. October 1988. Vol. 32, Iss. 11. pp. 347–348.
4. Shcheglov E. M., Kholodnyi D. P., Grachev S. N., Titov V. N., Burmykin V. B., Ivleva L. S., Inozemtsev N. S., Mikhailov V. G., Dubrovskii S. A. Improving the Technology for the Blow-In of Blast Furnaces After Class-I and Class-II overhauls. Metallurgist. March 2014. Vol. 57, Iss. 11–12. pp. 1082–1087.
5. Druzhkov V. G., Makarova I. V. Influence of material movement within the blast furnace working space on the blowing process. Teoriya i tekhnologiya metallurgicheskogo proizvodstva. 2016. No. 2. pp. 13–17.
6. Druzhkov V. G., Makarova I. V., Potapova M. V. Specification of nature of materials and gases movement in blast furnace’s workspace in blowing-in process. «Chermetinformatsiya». Byulleten «Chernaya metallurgiya». 2017. No. 1. pp. 35–38.
7. Bolshakov V. I., Golubykh G. N., Mozharenko N. M. Experience of blowing-in of blast furnace. «Chermetinformatsiya». Byulleten «Chernaya metallurgiya». 2009. No. 7. pp. 40–54.
8. van Oudenallen R., Wise J., Gravemaker G.-J. Blow-in of blast furnaces after long stops. Chernye metally. 2010. No. 6. pp. 25–29.
9. Chernobrivets B. F., Alter M. A., Emelyanov V. L., Kaporulin V. V. Blowing-in a blast furnace after a long-term shut-down without discharging saw-iron and filling in water. Metallurgist. October 1995. Vol. 39, Iss. 10. pp. 176.
10. Podkorytov A. L., Kuznetsov A. M., Zubenko A. V., Semenov Yu. S., Nesterov A. S., Shumelchik E. I. Introduction of Pulverized-Coal Injection at Yenakiieve Iron and Steel Works. Steel in Translation. 2017. Vol. 47, No. 5. pp. 313–319.
11. Bolshakov V. I., Semenov Yu. S., Shumelchik E. I., Gorupakha V. V., Podkorytov A. L., Zubenko A. V. Realization of energy-saving technology of modern blast-furnace filling in short-term fuel-raw and technological conditions. Metallurgicheskaya i gornorudnaya promyshlennost. 2014. No. 6. pp. 6–14.
12. von Stein Kallenfels E. New reliable method of reduction of “frozen” blast furnace. Stal. 2005. No. 10. pp. 28–31.