Mishalkin A. Improvement of the efficiency of the blowing operation converters on the basis of investigation of hydrodynamics and mixture of bath

The thesis for a scientific degree of Candidate of Technical Sciences in specialty 05.16.02 - Metallurgy of ferrous and non-ferrous metals and special alloys, National Metallurgical Academy of Science, Dnepropetrovsk, 2009. The thesis is focus on development of the theoretical mixture of the converter bath, improvement efficiency of the blowing operation of the oxygen converters. Summed of the results of the theoretical and experimental investigations connected with the processes of mixture and formation splashes of the liquid phase in the converters with different methods of blowing. Applying the modern methods of cool and high - temperature modeling it has been received the new detailed information about hydrodynamics and specialties of the oxygen and gas - powdery changing the means parameters of blowing, variations of place and quantity of the blowing mechanisms. On the basis of the theoretical analysis, analytic calculations and results of experimental investigations it has been found the possibility of existing increasing intense of the blowing without increasing the loss of metals with wastes in the converters of combined blowing, AOD - units with organization of blowing through two - stage tuyers. It was shown, the most appropriate variant of combined top and bottom blowing is principal oxygen blowing through the top tuyer To intensify basis metallurgical processes in converter bath bottom blowing is spread without fusion of direct reactive zones and with obligatory partial bottom blowing in direction to top oxygen stream. Coordination of gas stream expenses provides the interaction, formation of basic reaction zone and given regulated position of it in bath volume. Experimentally based on usage of experiemed powdery black limestone technogenic production wastes the effectiveness of developed combined top-bottom blowing programme is confirmed. Putting experiemed reagent through bottom tuer in the reaction zone of top and bottom oxygen blows provide earlier formation of active basic slag, and controlled interaction mixture carburizing of the metal.The scheme of mixture bath and formation splash mechanism of liquid phase are more exact, mixture criteria without dimensions has been developed. Expressions for splashing hight calculation and converter space height have been received.