Numerical Simulation Study On The Flow And Heat Transfer For Four-strand Tundish With The Channel Type Induction Heating

Channel induction heating tundish can effectively compensate for the heat loss of molten steel,reduce the requirement of outlet temperature of ladle,and stabilize the outlet temperature of tundish,to achieve low superheat constant temperature casting.In this paper,a four-channel induction heating tundish of a steel plant is taken as the prototype.The optimized model is obtained by water model experiment,and the comparison experiment and numerical simulation are carried out to analyze the effect of channel heating on the flow field and temperature field of tundish.The water model experiment of the retaining wall structure shows that the uniformity of the flow in the four-stream tundish can be solved by installing the retaining wall and the diversion hole in the injection chamber.Through the comparison of the scheme,the retaining wall with a 80×70 mm square diversion hole slant 6° is better,the response time of the middle stream and the side stream is only 0.83 s,and the average residence time was prolonged,it benefits the blender and inclusion removal.The experimental results show that the hot fluid flowed into the distribution chamber through the channel due to rise with the decrease of the density,and the velocity of diffusion to the upper part of the tundish was obviously accelerated to form the regurgitant zone,The upper dead zone disappears and the lower dead zone is reduced to avoid the scouring of the wall and the generation of short-circuit flow.The numerical simulation results show that the heating of the channel will not affect the consistency of flow,but the heating will change the flow path of the distribution chamber,The volume of the dead zone decreased,the volume of the whole mixed flow area increased,and the response time and residence time were also increased compared with that of the non-heating mode.This was in agreement with the results of the water model experiment,that is,the heating promoted the propagation of the tundish.Numerical simulation of the heat transfer process shows that the channel heating significantly changes the temperature distribution in the distribution chamber.As the power increases,the fluid temperature increases,the high temperature zone is concentrated in the upper part of the distribution room,the lower part and the tundish outlet around the temperature distribution is more uniform,dead zone further reduced.Channel induction heating tundish to further enhance the metallurgical function of the tundish.