Simulation Of Heat Transfer And Inclusion Movement In Induction Heating Tundish Considering Ladle Heat Dissipation

Tundish connecting ladle and mold plays a key role in continuous casting.In the actual production process,the wall and top of the tundish will exchange heat with the air,and this process will cause the temperature of the liquid steel to drop.The tundish of electromagnetic induction heating can compensate the heat of molten steel flowing through the channel,although many researchers have pointed out that the tundish of electromagnetic induction heating can control the temperature of molten steel and improve the flow state of molten steel,it is important for the removal of inclusions and the superheat of uniform liquid steel.However,in the actual production,the heat loss of ladle in the process of casting to Tundish is also found,the heat loss of ladle and the changing behavior of ladle during casting are seldom studied.In this paper,the five-flow induction heating tundish is taken as the research object,the flow field and temperature field as well as the removal of inclusions are simulated and analyzed,and the accuracy of the numerical simulation results is verified by the physical model.The accuracy of numerical simulation results is verified by using physical models.Based on the finite element model,the distribution of Lorentz force and Joule Heat in the Tundish is analyzed,an-d the magnetic induction and Joule heat from Maxwell are introduced into fluent as source terms,the flow field,temperature field and inclusion removal in Tundish were analyzed.The research contents include: comparing the temperature field and flow field of tundish with or without heat dissipation of ladle,the influence of casting speed on flow behavior of Tundish with ladle;Analysis of flow field and temperature field in tundish with ladle under non-induction heating condition,induction heating condition and changing heating power condition during casting process;The influence of the channel inclination on the inclusion removal by electromagnetic induction heating is analyzed.The results show that the heat dissipation of ladle has a great influence on the temperature distribution and flow trend of molten steel in tundish,which is an important factor that can not be ignored;When the drawing speed is 1.72 m/min,the flow field in the tundish is the best;When the liquid level in the injection chamber is514 mm,the flow field in the tundish is optimal;The molten steel flows up from the channel into the chamber when the induction heating power is changed during casting at 100 s,700s and 1800 s,the temperature at each outlet was controlled at 1883 K,and the maximum temperature difference between different time points was not more than2K;Compared with non-induction heating,under electromagnetic induction heating,the removal rate of inclusions with particle sizes of 10 μm,20 μm and 40 μm was increased by 10.2%,11.3% and 12.6%,respectively,and the particle sizes of 60μm,80 um and 100 um the inclusion removal rate was increased by 14.6%,19.4%,25.6%;And the removal rate was 80.2%,when the channel slope was 3°.