Simulation Of The Effect Of The New Type Of Control Device On The Single-strand Caster Tundish

The appropriate tundish flow control device can effectively optimize the flow field in the tundish and increase the removal rate of the inclusion in the tundish.Through the physical and mathematical models,this paper investigates the the assembled schemes of effects of the new type of turbulence suppressor and double-baffle with refractory fillers to effect the flow field and inclusion removal rate of the tundish.The main conclusions are as follows:(1)The dyeing experiment of the hydraulics model shows that,in the impact area of tundish,the turbulence suppressor can buffer the molten steel flowing from the long nozzle,and play a role in restraining the turbulent kinetic energy.In three kinds of turbulence suppressor schemes,the turbulence suppressor with crescent-shaped blocks can produce an obvious swirling flow in the impact zone,effectively restraining the turbulent flow of molten steel and reducing the slags of the liquid surface.Three types of double-baffle with refractory fillers can reduce the dead zone to a certain extent,in which the dead zone volume fraction of the ‘X' type double-baffle with refractory fillers scheme is the smallest.(2)The RTD curves show that,compared to the prototype tundish,the scheme of turbulence suppressor with crescent-shaped blocks + ‘X' type double-baffle with refractory fillers +19mm filler bead is the best scheme,the piston area volume fraction is reaching23.55%,the volume fraction of the piston area is obviously higher than that of the original tundish.Compared with the volume fraction 18.98% of the dead zone of the prototype tundish,the dead zone volume fraction of the optimal scheme is also smaller,which is 16.66%.It is shown that setting up the turbulent suppressor and double-baffle with refractory fillers in tundish can optimize the flow field.(3)The results of the inclusion simulation experiment show that,in the same scheme,the simulated particles size distribution of 20~27 ?m removal rate is more than 40% higher than the simulated particles size distribution of 5~10 ?m and simulated particles size distribution of 11~19 ?m,it is because that the larger size of simulated particles are easy to float,and the smaller size of simulated particles are hard to float to remove.The variation rule of the corresponding removal rate is basically consistent with the variation rule of the overall average residence time.The overall average residence time is longer,and the removal rates of simulated particles are also high.(4)Different analysis for numerical simulation results of tundish,the results show that,the type of the refractory fillers is the main factor affecting the flow field in thetundish,the type of the turbulence suppressor is a secondary factor,and the effect of the diameter of the packed glass bead on the flow field in the tundish is minimal.(5)The comprehensive inclusion removal efficiency of scheme which has turbulence suppressor with crescent-shaped blocks + ‘X' type double-baffle with refractory fillers+19mm filler bead is the best,the comprehensive removal rate can reach 70.27%,it is in agreement with the optimal flow field scheme for the tundish.