Numerical studies targeted to increasing power supersonic jets in oxygen converter during slag splashing process have been presented in this paper. The calculations are based on a special design of the gas-cooled lance, in which the structure was simplified, as compared with a water-cooled lance. Importantly, the sprayed slag with nitrogen and magnesium-containing (MgO) powder were used in the study. The maximum heating temperature in lance nitrogen was equal to 493 °C. The work was preceded by laboratory studies conducted for convertor slag received in one of the European plants. The analysis of the computation results shows that the cooling of the lance with gas leads to the heat recuperation, which increases the temperature of the injected mixture, so that the kinetic energy of the outflowing jet in the converter increases about 3.5 times, and the slag is splashed higher than in the case of a conventional water-cooled lance.

The methods to improve the slag splashing operation were regarded in the article. The phase and mineralogical properties were studied for the converter slag's of one of the Europe Iron and Steel Works. The modeling results for the slags with different compositions are given on base of the earlier studies of the physical and chemical properties.Ill.8. Ref. 28. Tab.1.

The paper reviews the methods of improving the slag splashing process. Studies of the phase and mineralogical properties of converter slag were conducted at one of the European metallurgical complexes. Simulation results are provided with respect to slags of various compositions using the data from the earlier studies of the physical and chemical properties.

This paper presents a method for calculating the basic parameters of the gas jet (average temperature and power) at a certain distance from the nozzle exit in the technology implementation of blowing molten slag on the refractory lining of the converter. The mathematical model has been worked out and the fl ow parameters of the supersonic noncalculated jet, considering joining in the working volume of 350-t converter not only gas but also slag particles, have been calculated. Average weight values of temperature and velocity over the length of the gas jet have been obtained. The effect of the added slag mass on the added mass of gas, the temperature of the gas jet and its rate subject to the changes in the fl ow of nitrogen through the nozzle and the relative temperature in the working space of the converter has been established. The analysis of the results of numerical calculations has showed that the slag ejection changes signifi cantly the picture of the interaction of ternary supersonic noncalculated jet with the melt, at the same time even a slight attachment of slag to the gas fl ow promotes noticeable decrease of the propagation velocity of the jet.

Using a static model of two-speed motion of the gas suspension in gunning-lance it is shown how the powder concentration, carrier gas pressure,particle number density, equivalent diameter, shape factor, differential velocity, and dynamic phase slip have an effect on the aerodynamic drag coefficient, interfacial interacting force, inclusion volume fraction of gas phase, and velocity of soaring.

A method is proposed for calculating the basic parameters of a gas jet (its mean mass temperature and power) at a certain distance from the nozzle when slag melt is sprayed onto the converter’s refractory lining. On the basis of a mathematical model, the flow parameters of a complex supersonic jet are calculated, in conditions where not only gas but slag particles are injected into the working volume of a 350-t converter. The mean mass temperature and velocity are determined over the length of the gas jet. The influence of the added slag mass on the mass of added gas and on the gas jet’s temperature and speed is established, with variation in the nitrogen flow rate through the nozzle and the relative temperature in the converter’s working volume. Analysis of numerical results shows that slag injection significantly changes the interaction between the supersonic jet and the melt. Adding even small quantities of slag markedly slows the jet.

The influence of the powder concentration, carrier-gas pressure, particle density, the equivalent diameter and shape of the particles, the difference in speed of the solid and gas phases, and their dynamic slip on the aerodynamic drag in the guniting lance, the force between the solid and gas phases, the content of gas phase, and the terminal velocity is established by means of a static model of the two-speed motion of the gassuspension in the lance.

How does the preheating of nitrogen affect the mass of gas added to the supersonic jet that enters an oxygen converter? To establish the influence of this and other factors, an appropriate system of gasdynamic equations is solved.

A static model permits engineering calculation of the influence of eight factors on the basic parameters of a monodisperse flux; these parameters characterize the drag when technological powder is supplied to a blast furnace.