DOI: 10.52150/2522-9117-2023-37-121-138

Petriakov Mykolai Volodymyrovych, Engineering Director, PJSC Zaporozhstal, Pivdenne Shose, 72, Zaporizhzhia, 69008, Ukraina.

Gres Leonid Petrovych, D. Sc. (Tech.), Professor, Ukrainian State University of Science and Technologies, Lazariana Str., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0002-5343-3438. E-mail: leonid.gres@gmail.com

Gupalo Olena Viacheslavivna, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Lazariana Str., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0003-3145-9220. E-mail: gupaloelena@gmail.com

Vereshchak Viktor Ivanovych, Director, Research and production company “KOSH” LLC, Ivana Mazepy Ave., 31/11, Dnipro, Ukraine

Yeromin Oleksandr Olehovych, Dr. Sc. (Tech.), Professor, Ukrainian State University of Science and Technologies, Lazariana Str., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0001-8306-578X. E-mail: aoeremin@gmail.com

Hryhoriev Anton Serhiiovych, Student, Ukrainian State University of Science and Technologies, Lazariana Str., 2, Dnipro, 49010, Ukraine.

STUDY OF THE EFFICIENCY OF USING A MIX OF AIR, FLUE GASES AND PROCESS OXYGEN AS AN OXIDIZING AGENT FOR HEATING OF HOT-BLAST STOVES

Abstract. Raising temperature of the blast-furnace air is one of the well-known ways to save coke in iron production. To heat the blast-furnace air, hot-blast stoves are used, which are usually heated by blast furnace gas. Since the composition and calorific value of blast furnace gas are insufficient to achieve a blast furnace gas combustion temperature that ensures sufficient heating of the nozzles of hot-blast stoves to heat the blast-furnace air at 1160-1230 °C, various methods are used to increase the blast furnace gas combustion temperature. This paper investigates the effectiveness of one of these methods – the use of a mixture of atmospheric air, flue gases, and process oxygen as an oxidant for combustion of blast furnace gas in a hot-blast stove. To prepare the mixture, the hot-blast stoves are equipped with additional equipment: a heat generator for combustion of blast furnace gas with atmospheric air, and a mixer, where high-temperature flue gases generated during fuel combustion in the heat generator are mixed with atmospheric air and process oxygen to form a gas mixture containing 21% of oxygen. The use of the gas mixture prepared in this way increases the combustion temperature of the fuel in the hot-blast stoves, provides an increase in the heating temperature of their nozzle and increases the temperature of the blast-furnace air. The results of the work include a comparison of the efficiency of this method with other known methods of increasing the combustion temperature of blast furnace gas in the hot-blast stoves: enrichment of blast furnace gas with natural gas, heating of air and blast-furnace gas before combustion, and enrichment of combustion air with process oxygen. The paper shows that the use of a mixture of atmospheric air, flue gases, and process oxygen has some advantages over other methods, namely, it does not lead to a significant reduction in the rate of flue gases generated during fuel combustion in the hot-blast stoves, does not decrease heat exchanger in the nozzles, and increases the full use of the enterprise’s own energy resources (blast furnace gas and process oxygen) in the presence of their excess. The disadvantages of using the mixture include the possibility of forming an explosive mixture when mixing process oxygen with high-temperature fuel combustion products that may contain carbon monoxide. Therefore, the issues of safe implementation of mixing flue gases, process oxygen and atmospheric air require further research and detailed development of the mixer design.

Key words: hot-blast stove, natural gas, blast furnace gas, process oxygen, secondary energy resources, heat-generator.

DOI: https://doi.org/10.52150/2522-9117-2023-37-121-138

For citation: Petriakov, M. V., Gres, L. P., Gupalo, O.V., Vereshchak, V. I., Yeromin, О. O., & Hryhoriev, A. S. (2023). Study of the efficiency of using a mix of air, flue gases and process oxygen as an oxidizing agent for heating of hot-blast stoves. Fundamental and applied problems of ferrous metallurgy, 37, 121-138. https://doi.org/ 10.52150/2522-9117-2023-37-121-138

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