Salmash I. The development of the theory of heat and mass transfer at metal blowing in the ladle and improvement of refractory lining parameters of ''ladle-furnace''

Object - the process of the metaltreatment at the ladle furnace. Objective - to establish rational processing parameters of liquid steel argontreatmentthat ensures metalhigh quality, increasing the resistance of ladle lining and it's operating time on the basis of new ideas about the intensity of the blowing gasinfluence mechanism, the number and location blowing units at the mixing time and the nature of the meltconvective flows in the ladle. Research methods and equipment-investigations were carried out by using the theory of heat and mass transfer of metallurgical slags and melts and the theory of metallurgical meltsmixing. Mathematical modeling of steel stirringin the ladle furnace and modeling of the thermal state of the ladle furnace was performed using the finite element method based on the software package ANSYS. Physical modeling of metal mixing with an inert gas through one and two blowingunitswere carried out in consideration with the main criteria of hydrodynamic similarity. During experimental investigationsthermometering of analysis objectwas used in industrial and laboratory conditions. Theoretical and practical results - there was solved the urgent scientific and technical problemof the rational values of blowing units and ladle lining design parameters(the relative radius of the blowing unitslocation, unitsblowing angle, refractoriesthermal diffusivity, refractory materials coefficient of thermal expansion of the slag-line area, the refractory thickness in the slag-line area)determination for the ladle-furnace unit that enhance the operational stability of lining working layer up to 29 - 30 pourings, that was made on the basis of theblowing gasintensity, the number and location of blowing units at the time of mixing and the convective flow of the melt in the ladlenature mechanismsrepresentationNovelty: 1. Further developed ideas about the influencemechanismof gas injectionintensity, the number and location of blowing units at the time of mixining. Using 2 instead of 1 blowing unitsreducemixing time at 1.3 - 1.7 times. 2. The classification of metalmixing modesduring inert gas purge that includes the five schemes of convective flows movement depending on the number and location of the blowing units in theladle bottom were offered firstly. 3. For the first time wasestablished that under the influence of thermal load, which occurs when steel was keeping in the ladle with a temperature of 1600 ° C or itslowing with gasflow rate of 250 l / min., the expansion of the walls lining in the radial direction by 15 - 16 mm, occurs. 4. Further developed assessment of theslag-line area liningworking layerwearduring steel treatment at the ladle furnace unit on its strength. Introduction extent - the recommendations were implemented in conditions of PJSC "Energomashspetsstal" The sphere of usage - metallurgy.