Numerical Simulation Of Multi-physics Coupling Jet In A DC Ladle Furnace

With the rise of national strength,the performance and quality requirements of steel materials in various fields have become more and more stringent.In order to meet the everincreasing market demand,the refining technology and equipment outside the furnace have been paid more and more attention by metallurgical workers.The good desulfurization and heating effect of the DC ladle furnace makes it an indispensable external refining equipment in the steel plant,so it is necessary to deeply analyze the transmission behavior in the DC ladle furnace.Arc heating is an important heat source of DC ladle furnace and has a key influence on the transmission behavior in the furnace.However,the high temperature operating environment of the DC ladle furnace makes experimental research very difficult,so numerical simulation has become an effective tool for revealing the transportation behavior of the LF furnace and achieving process optimization.In order to deeply analyze the transmission behavior in the DC ladle furnace,it is necessary to study the influence of the plasma jet on the overall temperature field and flow field in the DC ladle furnace.In this paper,the classic APDL module and CFX fluid calculation module in commercial software ANSYS are used to numerically simulate the plasma jet in the DC ladle furnace and the flow behavior of molten steel in the LF furnace,and the following results are obtained:(1)In the DC ladle furnace,the plasma jet presents a bell-shaped distribution under the dual action of electromagnetic force and pressure.In the arc column area,the flow field is symmetrically distributed with the centerline of the electrode as the axis of symmetry,and the axial velocity can reach up to 1476m/s;in the area near the graphite cathode,the plasma jet flows towards the cathode,the maximum velocity is close to 2000m/s,and the maximum temperature Up to 29600K.(2)Under the pinch of electromagnetic force,the area through which the arc current mainly flows is enlarged from a circular area of 7.5mm at the cathode spot to a circular area of 30mm at the surface of the molten pool.(3)In the plasma jet area on the surface of the molten pool,the velocity and pressure change drastically,and the kinetic energy of the plasma jet is converted into pressure energy.(4)In actual production,small current and short arc operation can strengthen smelting.(5)The driving force of molten steel in the ladle furnace mainly comes from bottom blowing argon.Under the condition of only electromagnetic force driving,the maximum velocity of molten steel in the molten pool of ladle furnace is 0.08m/s;under the condition of only bottom blowing argon,the maximum velocity of molten steel in the molten pool of ladle furnace is 0.58m/s.