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Synopsis The formation process of burden distribution at blast furnace top was dynamically and quantitatively investigated by the use of a mathematical model, based on the equations of motion on distinct particles and the constitutive equation described by a Voigt-Kelvin rheological model with a slider. In order to increase the estimation accuracy of the mathematical model, the dashpot factor, which represents the kinetic energy dissipation of particles in the formation process of burden distribution, was experimentally determined. The following findings were obtained through the application of the mathematical model. The slope angle has significant influence on the burden deposit behavior throughout the charging. An increase of the amount of charge relates to an increase in charging rate, which results in a decrease of the deposit angle. The size segregation phenomenon on the slope can be quantitatively evaluated by the mathematical model. The change of the charging conditions of small particles onto the slope results in a change of the small particle distribution on the slope as well as a change of the deposit profile. A decrease of charging rate caused by an increase of charging time reduces the thickness of the flowing layer o f particles, resulting in the enhancement of percolation of small particles on the slope.

Two Dimensional Analysis on the Formation Process of Burden Distribution at Blast Furnace Top