Study On Optimization Of Flow Control Devices In Four-Strand T Type Tundish

Metallurgy in tundish is an important step in the continuous casting process. The major metallurgy action of tundish is to adjust molten steel flowage through setting up flow control devices and reach the effect of average steel temperature and promoting the nonmetal inclusion to float. Therefore, lots of scholars adopt numerical calculation and water model methods to research the control of molten steel flowage in tundish.This paper bases on studying a four-strand T type tundish in a specific steel plan. We carry out analyses and studies systematically and quantitatively by the methods of physical and numerical simulations to optimize the flow control devices of T type tundish.Using"stimulate-response"technology and applying standard deviation as an evaluating indicator in the physical experiment, we analyze the average residence time of fluid in the tundish with different flow control devices, in the meantime, research Vd,Vp and Vm with the two flow control devices by metallurgy reactor model; We choose the k-εmodel in the course of numerical simulation and calculate the flow field of tundish with the PHOENICS software, analyze the influence of guide wall, guide pore, stopper and turbulence inhibitor on the flow field, discuss the molten steel flow character, distribution curve of turbulent flow energy and streamlined distribution with different flow control devices.Experimental result indicates that under the condition of primary flow control devices, because of irrationality distribution of guide wall's structure and position, impact zone is small, reflux velocity becomes large, it is adverse to the floating of nonmetal inclusion and is easy to cause involving slag, the average residence time differ greatly between No.1 strand and 2, temperature and fluid flow characteristics are different largely, the proportion of dead zone is big, the flow control devices need further optimization.Optimizing low control device adopt combination of V type guide wall and turbulence inhibitor, increasing impact zone and decreasing fluid velocity, turbulent flow energy at liquid level located the class of 10^-5m²/s², molten steel liquid is quiet relatively, it is favorable to the floating of nonmetal inclusion. At the meantime, it can improve fluid flow characteristics and prolong the time of molten steel entering into No.1 strand, the average residence time of each strand becomes concordance.The distribute of each strand temperature becomes reasonable,it can increase continuous casting rate and improve the qualityof the casting blank.