Heat Transfer Mathematical Modeling Of Ladle In Production Cycle

In allusion to the problem of large variation range of the factors affecting on ladle hot states in production cycles, the ladle hot behavior in production cycles was mathematically simulated by the finite difference method and the effects of different kind of influencing factors on ladles hot behavior were studied.Because of radial symmetry of heat transfer, the conduction mathematical model of two-dimensional circular cylindrical coordinates was adopted for mathematical modeling of ladle thermal behaviors. Discretization of the modeling district was treated with the internal node method, and boundary heat transfer with the third boundary condition, combined coupling derivation with radiant network equations in the ladle internal surfaces not contacted with molten steel. During filling molten steel, the heat behavior of molten steel was treated with energy-balance method. In heat transfer simulating of the slag layer, the latent heat of slag was treated with sensible thermal capacity method. By structuring program Turbo C, the ladle heat transfer modeling was programmed to computer procedure. The procedure was divided into four modules that executed individually different operation functions, in order to program debugging and maintaining. From the data of ladle production parameters collected from 445 ladle times in production cycles, the mean operating time of each working process, which it was used for the calculating times of each process time in modeling, was counted. In order to proving the accuracy of modeling results, the temperature variation of ladle external surface in production cycles and molten steel were measured, and the results were very anastomotic.With the modeling results, the effects of influencing factors on the heat states of 160t ladles and molten steel temperature in production cycles at PZH Steel were analysed, and the main influencing factors were discovered.