Beitsun S. Perfecting of ladle degassing process on base of mathematical simulation.

Dissertation is devoted to experimental and theoretical exploration of ladle degassing process with the purpose of perfecting of technology vacuum treating of steel. On base of experimental studies on industrial conditions the statistical estimations of duration of technological operations of steel outfurnace treating are obtained, for each technological operation the termo-physical constants are updated and the variation of ladle melt temperature is determined depending on mass of melt, on initial temperature of melt and internal surface of ladle lining, that has allowed the adequate mathematical models of separate operations and the event-simulation model of all technological process on the site of steel outfurnace treating to elaborate. For the first time on base of experimental studies the dependences of slow changes of melt level and high-frequency oscillatings of its surface from pressure in the vacuum-camera and from charge of argon on the blowing through during degassing are received and the applicable dynamic model is designed. On base of experimental and modelling explorations the dependence of change of concentrating of hydrogen, which remissed in steel, from the degassing time, pressure in the vacuum-camera and the charge of argon on blowing through during degassing is received. The disposal of hydrogen is submitted as operation of two interconnected processes: removal it through open surface of melt and in bubbles of argon. The effectiveness ratio of each process are also determined.