DOI: 10.18503/1995-2732-2025-23-2-41-49
Abstract
Problem Statement (Relevance). For the operation of a blast furnace with low specific coke consumption and high productivity, an important condition is the uniform distribution of the charge components in its blast furnace throat. Rational distribution of the charge and gases should ensure high efficiency of the reduction and thermal processes, as well as smooth discharge of the charge without hanging. Objectives. By means of mathematical modeling, evaluate the influence of the loading mode parameters and the distribution of the charge components along the radius of the furnace top on the gas temperatures in the peripheral, axial zones of the furnace top and the ore crest. Derive statistical dependencies of the temperature ratio between the periphery, ore crest and axial zone of the furnace top on the loading parameters and blast characteristics when changing the equivalent coke size. Result. According to the results of the study, the increase in coke size in furnaces with a chute loading device was accompanied by spontaneous redistribution of coke, which depended on the blast characteristics and loading parameters, including the initial mode of loading the charge components into the blast furnace. In this regard, statistical dependencies were derived for the ratio of temperatures between the periphery, ore ridge and axial zone of the blast furnace on the loading parameters and blast characteristics. As a result of mathematical modeling, it was established that with a share of the iron ore part of the charge to the mass of iron ore raw materials (IOR) and coke entering the blast furnace from the angular position stations of chute No. 9-11, 6-8 and 3-5, within the limits equal to 100, respectively; 43.7-47.1 and 42.6% at constant backfill level, ore load, equivalent size of agglomerate and pellets, their share, hot blast pressure and blast furnace gas, spontaneous redistribution of coke with an increase in its equivalent size was directed mainly to the axial zone with some of it flowing into the ore ridge zone. A decrease in the share of iron ore raw materials to the mass of iron ore raw materials and coke coming from the angular position stations of chute No. 9-11 from 100 to 69% with an increase in this ratio in the ore ridge zone from 58.1 to 58.9% ensured a preferential flow of coke from an increase in its size mainly into the ore ridge zone. An increase in the equivalent coke size under conditions of a lower fill level from 1.25 to 2.46 m was accompanied by its flow predominantly to the center with some movement to the wall region of the furnace throat. Practical Relevance. The obtained equations can be used to adjust the modes of loading of charge materials in the annular zones of the blast furnace throat when changing the equivalent coke size and operational assessment of the distribution of charge components in the throat, which will allow a justified choice of rational parameters for the modes of loading charge into the blast furnace.
Keywords
blast furnace, equivalent coke surface size, iron ore raw materials, rational distribution of charge, mathematical modeling
For citation
Kharchenko A.S., Pavlov A.V., Yudina S.V., Sibagatullin S.K., Svechnikova N.Yu., Yudin D.V. Mathematical Modeling of the Influence of Equivalent Coke Size on the Change in Temperature Conditions in Radial Zones of a Blast Furnace for Various Loading and Blasting Parameters. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2025, vol. 23, no. 2, pp. 41-49. https://doi.org/10.18503/1995-2732-2025-23-2-41-49
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