DOI: 10.52150/2522-9117-2023-37-105-120

Kryachko Hennadii Yuriiovych, Ph. D. (Tech.), Associate Professor, Department of metallurgy, Dniprovsky State Technical University, Dniprobudivska St., 2, Kamyanske, 51918, Ukraine. ORCID:0000-0002-8773-508X. E-mail: nauka_m4m@ukr.net

Siharov Yevhen Mykolaiovych, D. Sc. (Tech.), Professor, Head of Department of metallurgy, Dniprovsky State Technical University, Dniprobudivska St., 2, Kamyanske, 51918, Ukraine. ORCID: 0000-0002-8229-7877.
E-mail: en_sigarev@ua.fm

Pokhvalityi Artem Anatoliiovych, Ph. D. (Tech.), Associate Professor, Department of metallurgy, Dniprovsky State Technical University, Dniprobudivska St., 2, Kamyanske, 51918, Ukraine. ORCID: 0000-0002-9652-767X. E-mail: artemmslp@gmail.com

FEATURES CHOICE PARAMETERS SHOULDERS OF BLAST FURNACES

Abstract. The purpose of the work is to establish the peculiarities of the selection of shoulder parameters in the design of new and reconstruction of existing blast furnaces. The change of approaches to the selection of the parameters of the shoulders is considered – the angle of inclination of the walls β and their height hz. It is shown that at the beginning of the studied period, the interval between 79 and 82⁰ with a difference of three degrees was considered the rational range of the angle β. Currently, this range has expanded mostly towards smaller values and is 71-83⁰ with a difference of 12⁰, which is four times more than in the 1950s. It is shown that the angle β should be adjusted, first of all, according to the flow rate of each air nozzle, and then according to the composition of the blast furnace. This consideration should be mandatory, since one tuyere of powerful furnaces with a volume of 5000-5500 m³ at the same relative blowing costs per furnace takes almost twice as much as a tuyere on a furnace with a volume of 1033 m³. Based on the analysis of the condition of the charge column of blast furnaces frozen in progress, it was established that the height of the shoulders should be determined not by the quality of raw materials, as was recommended earlier, but by the design technology of melting and the organization of the charge column. As a result of the changes in the operation of air nozzles and the development of nozzle hearths with an increase in the volume of blast furnaces, there is an objective need for a relative expansion of the gap due to a gradual increase in the difference D–d_g with the adoption of measures to ensure the appropriate distribution of materials and the formation of the structure of the charge column. For the general evaluation of the parameters of the shoulders, an indicator is proposed – the index of the shoulders, which is equal to the ratio of the angle of inclination of the walls to the height of the shoulders.

DOI: https://doi.org/10.52150/2522-9117-2023-37-105-120

Key words: blast furnace, shoulders, choice, angle of inclination of walls, height, tuyere hearth, structure of charge column, spacer, expansion.

For citation: Kryachko H. Yu, Siharov Ye. M., & Pokhvalityi A. A. (2023). Features choice parameters shoulders of blast furnaces. Fundamental and applied problems of ferrous metallurgy, 37, 105-120. https://doi.org/10.52150/2522-9117-2023-37-105-120

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