Krivenko S. Development of the theory of gas dynamics of the sintering charge layer and intensification of thermal processes during sintering

The goal is to improve the gas-dynamic and thermal conditions of the sintering process of iron ore materials based on the development of scientific ideas about the movement of gases in the layer of the sinter charge and to improve its zonal structure. Object of research: processes of pelletizing and sintering of sinter charge. Subject of research: gas dynamics of the sinter charge layer and the heat balance of the sintering process. Research methods. Analytical and theoretical researches of gas dynamics of the sintering layer, methods of mathematical modeling, physical modeling, experimental planning, methods of mathematical statistics, methods of passive experiment, balance method of analysis of the agglomeration process. A telemetric method for determining the particle size distribution and a method for researching the structure of the sintering layer have been developed. The theoretical concepts of the gas dynamics of the charge layer were further In the dissertation developed. The complex dependence of the coefficient of gas-dynamic resistance of the Darcy-Weisbach equation in the entire range of changes in the volumetric content of small granules for the first time has been substantiated. A discrepancy between the rates of change in moisture content and the geometric parameters of the charge and the layer at the outlet of the pelletizer for the first time was established. An indicator of the efficiency of agglomeration charge pelletizing and an index of humidification of sinter charge have been developed. The scientific understanding of the capillary interaction of particles of different diameters and wettability inside granules has been developed. A functional dependence of the layer porosity on the coefficient of variation of the particle size and the equivalent diameter of the granules for the first time has been established. The dependence of the ratio of the water numbers of the air flow to the sinter flow relative to the fuel combustion zone in the layer has been clarified. The dependence of the distribution of fractions within the charge flow from the pelletizer with segregation of granules during loading for the first time has been established. The results of the dissertation work on improving of the pelletizing of sintering charge were introduced at PJSC «AZOVSTAL IRON & STEEL WORKS» with the expected effect of 457.8 thousand USD and tested at PJSC «ILYICH IRON AND STEEL WORKS» with an expected economic effect of USD 137.3 thousand.