Determination of the Thermophysical Parameters Influence on the Heat Exchange Processes Intensification in the Steel-Fuel Unit Bath

One of the most important problem in the development of power-saving steelmaking technologies is the problem of blowing a bath of a steelmaking unit with the organization of an efficient oxygen modes of reburning CO oxygen in steel-smelting furnaces with the purpose of smelting heat balance improvement. In conditions of shortage and high cost of power sources, this technology allows to bring the expense of steel smelting process. In order to analyze and intensify the thermal and oxygen modes of melting and determine the influence of the purge intensity on the thermophysical and gas-dynamic processes in the bath, the heat exchange in the volume of the steelmaking unit during bubbling of the melt was performed. The results of studies aimed to the study of the effect of thermophysical parameters of the feeding gas on the intensification of heat transfer processes during bubbling of the melt in the bath of the steelmaking unit are given. The influence of the blower nozzles inclination angles and the position of the tuyeres over the melt on the heat transfer process was determined. The dependence of the heat flux value during the interaction of the oxygen jet with the surface of the slag melt on the oxygen consumption and the heat transfer coefficient was found. It is established that with the increase of the nozzles inclination angle, the values of the heat transfer coefficient and the heat flux reduce. This is due to the increase in the length of the jet, the decrease in the depth of the hole. This leads to a decrease in the intensity of bath mixing and less heat transfer to the slag and to the metal. When the blowing device approaches to the melt, an increase in the heat transfer coefficient and heat flux is noted. It is connected with the intensification of the bath mixing.