Фундаментальные и прикладные проблемы черной металлургии

DOI: 10.52150/2522-9117-2024-38-103-119

Nesterov Oleksandr Stanislavovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-0183-0327. E-mail: asn.dnepr@gmail.com

Harmash Larysa Ivanivna, Ph. D. (Tech.), Senior Researcher, Division of cast iron, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-6873-6685. E-mail: larysagar@gmail.com

Muravyova Iryna Hennadiivna, D. Sc. (Tech.), Senior Researcher, Leading Researcher, Division of cast iron, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-5926-7787. E-mail: irinamuravyova@gmail.com

Chaika Oleksii Leonidovych, Ph. D. (Tech.), Senior Researcher, Head of the Laboratory of Heat and energy saving technologies, Division of cast iron, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0003-1678-2580. E-mail: chaykadp@gmail.com

Lopatenko Kostiantyn Petrovych, Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. E-mail: lopkonst@gmail.com

Boldenko Mykhailo Hryhorovych, Junior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine

INFLUENCE OF HYDROGEN ON REDUCTION PROCESSES  IN A BLAST FURNACE

Abstract. The development and implementation of new low-carbon technologies is an urgent strategic task for the ferrous metallurgy. The use of hydrogen instead of carbon as a reducing agent in blast furnace processes is a promising way to significantly reduce harmful emissions, but the efficient use of hydrogen requires an in-depth study of the influence of various factors (temperature, chemical composition, porosity, reduction time, etc.) on the reduction processes. Despite a large number of studies, there is still no unambiguous and generally accepted theory that would generalize all the patterns of hydrogen reduction processes in a blast furnace, and the results of studies which were conducted under various conditions are quite contradictory. To determine the prospects and problems of using hydrogen-containing gases in Ukrainian metallurgical plants, it is necessary to study the reduction behavior of various types of raw materials characteristic of Ukrainian realities. A number of studies of the effect of hydrogen on reduction processes in a blast furnace for different types of iron ore raw materials of Ukrainian production were conducted in the laboratory conditions of the ISI. The reduction processes were modeled on the laboratory equipment of the ISI using various mixtures of reducing gases close to industrial conditions. The effect of hydrogen content, heating rate and gas feed rate on the mass loss of the samples was studied and then the reduction index R was calculated. It was determined that an increase of the hydrogen content in the reducing gas mixture in the temperature range of 900-1000 °C is accompanied by an improvement in reduction for various charge materials, but the reduction behavior of the sinter and pellets differs significantly for different ranges of hydrogen content in the gas mixture and different feed rates. Analysis of the experimental data allowed to determine the most effective ranges of hydrogen content in the reducing gas for these conditions. The results obtained confirm the effectiveness of using hydrogen as a reducing agent in the conditions of Ukrainian blast furnace, and the obtained patterns and conclusions can be used to improve technologies that facilitate the production of environmentally friendly steel.

Key words: decarbonization, reduction processes, hydrogen, iron ore raw materials, reducibility.

DOI: https://doi.org/10.52150/2522-9117-2024-38-103-119

For citation: Nesterov, O. S., Harmash, L. I., Muravyova, I. H., Chaika, O. L., Lopatenko, K. P., & Boldenko, M. H. (2024). Influence of hydrogen on reduction processes in a blast furnace. Fundamental and applied problems of ferrous metallurgy, 38, 103-119. https://doi.org/10.52150/2522-9117-2024-38-103-119

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