Method of determining the position and shape of the cohezive zone in a blast furnace using gas flow temperature distribution indicators
Authors:   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Muravyova I. H. , Ivancha M. H. ,   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Shcherbachov V. R. ,   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Vіshnyakov V. I. ,   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Yermolina K. P. ,   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Biloshapka O. O. ,   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Khodotova N. Ye. ,   Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine
Published: May 2023

The purpose of the work is the development of analytical and indirect methods for determining the shape and position of the plastic zone of a column of blast furnace charge materials. It is shown that the development of new mathematical models and methods for operational determination of the parameters of the cohezive zone for installation on blast furnaces of various means of controlling the distribution of the charge and gas flow has the greatest potential for further use in solving the problems of effective control of blast furnace melting. A new method for determining the parameters of the plastic zone (shape, thickness, and position) in the blast furnace is proposed, which is a combination of known and improved mathematical models as a result of research: loading of charge materials into the blast furnace, determination of melting temperatures and softening of iron-containing components of the charge in its various zones, determination parameters of the charge column in the dry zone of the blast furnace, determination of the area of the melting surface and a new method of determining the position of the softening and melting lines in the blast furnace using information on the means of controlling the temperature distribution of the gas flow and the surface of the charge backfill. The configuration of the melting line (surface) is determined on the basis of the similarity of this line to the temperature distribution curve of the gas flow (filling surface) on the furnace surface, as well as the equality of the area of the side surface of the figure of rotation of the forming line around the axis of the furnace and the calculated melting area. The calculation of the coordinates of the points of the softening line is based on the results of mathematical modeling of loading processes and the distribution of charge components along the radius of the blast furnace top, which provides the possibility of determining the component composition of iron ore layers of charge materials in a given zone of the furnace and forecasting the formation of melts and their properties with the help of high-temperature transformation models. Unlike the known approach, according to which when determining the area of the melting surface, the amount of heat in the lower part of the furnace is set as a constant, the proposed method implies the calculation of this value taking into account the current technological conditions of blast furnace melting.