The Ladle Bottom Blowing Argon Numerical Simulation Research

The most important metallurgical reactions in modern secondary steelmaking processes are mostly carried out in the ladle, including desulfurization, deoxygenation, decarbonization, alloying, and alloy composition fine-tuning, degassing, and removing non-metallic inclusions and modification and temperature control. And with the more rapid development of ladle bottom blowing in secondary steelmaking processes it has become an indispensable link in steelmaking process.Based on the prototype of new200t ladle established by a steel mill, this paper sets up appropriate mathematical models and boundary conditions. It uses reasonable assumptions and simplifications with the application of commercial software FLUENT to proceed two-phase flow simulation powder ladle of molten steel bottom and argon. Within different purging placement and argon blowing gas, the flow pattern of molten steel in the ladle is researched with the comparative analysis of the effect of the flow field.It determines a flow rate of injection600NL/min,700NL/min,800NL/min. And then by designing orthogonal experiment, this paper takes the four factors and three levels orthogonal experiment L9(34). By direct analysis, ANOVA, visual analysis and flow field analysis it obtained that it is more obvious for the significance from plug to center distance and nozzle hole cone angle. The effect from plug to center distance on the dead zone is more obvious than purging angle which is more obvious than flow.With the increasing of distance from the center position purging, the proportion of dead zone showed an increasing trend. When the two holes are located1/2R, proportion of dead zone is the largest one, followed by declining. The proportion of the dead zone is increased as the increasing of the angle between the orifices. In this case the flow is800NL/min and orifice angle is60°, the optimal solution for orifice distance of circle distance from ladle bottom is the1/3R.Then it selects Euler-Lagrange stochastic trajectory model offered by Euler Fluent commercial software. It simulates how gas flow rate and injection location affects the removal of inclusions. The result:impact purging arrangement for inclusion removal is greater than the amount of blowing, blowing amount can be increased to improve the removal of non-metallic inclusions, but when the blowing ratio is large, the effect is not significantly improved.