Behavior Of Collision-Coalescence And Removal Of Inclusion For The Tundish With The Channel Type Induction Heating

With the increase of the size and amount of inclusions,properties of steel products degenerate significantly.In modern steel production,it is very important to reduce the inclusion content and to control the composition of inclusion of molten steel.Induction heating is a good tool to prompt collision-coalescence and removal,and can effectively compensate for the heat losses of molten steel during continuous casting,so it has used in the steel company.In order to have a deep insight into the tundish with the channel type induction heating,this paper gave the flow field,the temperature filed,magnetic filed and the other multi-physical fields and the collision-coalescence and removal of inclusions in the tundish with/without induction heating.Based on the finite element method,this paper gave the magnetic field,induced current density field,electromagnetic force field and Joule heat field.The electromagnetic force and Joule heat were introduced into the Navier-Stokes equations and energy conservation equation,and finite volume method was applied to give the flow field and temperature field.Based on the conservation diffusion model,the inclusion's mass and population conservation equations were applied to investigate the inclusion collision,coalescence and removal in the tundish.The key factors are inclusion's concentration,inclusion's number density and inclusion's characteristic radius.Furthermore,this paper also investigate the effect of top slag,solid boundary on the inclusion's adsorption.The numerical results showed that:(1)The technology of the channel induction heating can prompt the floatation of the molten steel in the tundish.Such a flow field can alleviate the impact of the molten steel on the front wall of the tundish,prompt the mixing of molten steel and compensate for the heat loss due to the wall.(2)When the steel liquid velocity of tundish is 0.5m/s,with the help of the heat convection caused by the induction heating,inclusion's number density falls 33.5%and inclusion's volume concentration falls 38.2%at the exit of the tundish.(3)The order of the adsorption capacity of inclusion in the tundish is top slag,channel wall and tundish wall.Their contributions are 79.73%,18.93%,1.34%,respectively.After induction heating,their contribution are 80%,19.53%,0.47%,respectively.The top slag and the tunnel wall in the tundish play the key roles in the adsorption of the inclusion.(4)The smaller the velocity of the inlet,the more obvious inclusion removal effect is.With the increase of inlet velocity,the inclusion's number density and volume concentration tend to be stable.The inclusion's characteristic radius at the tundish exit is different with/without induction heating.But the difference decreases gradually with the increase of the inlet velocity of molten steel.