Fyzikální modelování přenosových procesů mezi kovem a struskou v licí pánvi

Abstract

This thesis devoted to the possibilities of physical modeling and simulation methodology of the transfer processes occurring between metal and slag and with the presence of a third phase – inert gas (Ar), which serves to the bath homogenization. In these modeled experiments, the effects of the location of the blowing blocks and/or immersion nozzle on the course of transmission processes between metal and slag were investigated. Modeling was performed on the physical model ladles constructed in the geometric scale of 1:9. Realization of transfer process was studied on the basis of changes in iodine concentration between the aqueous solution and paraffin oil and was described by a mathematical formula whose primary output is the dimensionless concentration dependence on dimensionless time. The method for determining loss of iodine in aqueous solution is based on sodium hyposulfite titration. The achieved results point to the significant transfer during gas blowing through the central block. Blowing gas through the center of the ladle bottom and through the immersion nozzle located in the ladle middle and the depth of 11 cm from the bottom is more advantageous than eccentrically located blowing blocks in the transition process. Efficiency of transfer processes is supported by a central location of blowing element, respectively nozzles and higher flow rates, leading to greater emulsification of paraffin oil (slag) in aqueous solution (steel). Emulsification is increasing the contact area between slag and metal, and thus is accelerating the chemical reactions taking place on this interface.