Tundish Structure Optimized Numerical Simulation

The continuous casting technology has been rapidly developed in the last decade. With the rapid development of continuous casting technology, the quality of steel, especially the content of the non-metallic inclusion in the steel has attracted many researchers'attention.The flow behavior of steel in the tundish has a deep influence on the composition of the steel and the separation and removal of the non-metallic inclusions. So installing appropriate flow control devices to control the flow state of the liquid steel has become a focus of research. In the Xin Yu Iron and Steel Group, the tundish's injection flow area is small, the shape of diversion wall and the angel of the deflector hole be settled unreasonable, induce the problem of the different temperature in the different outlet and the non-metallic inclusions is too high.In the research, the Fluent is used to do the numerical simulation and analyze the tundish's flow patterns and temperature distribution which be used in Xin Yu Iron and Steel Group's 2# billet continuous casting machine. On this basis, presenting some optimization programs for the tundish's construction, then do the numerical simulation to every program to obtain the results of the tundish's flow patterns,the temperature distribution and the transient RTD curves, get the best tundish's construction by comparative analysis every program's flow patterns,the temperature distribution and the transient RTD curves.The results show that, the tundish be used in the Xin Yu Iron and Steel Group, whose injection flow area is small, the average residence time of the steel stay in the tundish is 655s, the steel haven't be mixed adequate, the temperature of different outlet is different from each other, The maximum temperature difference is 6K. For the unreasonable setting of the deflector hole, the main flow of the steel in the casting area is the parallel to the bottom's circulation, there is no vertical flow upward, and the non-metallic inclusions have little chance to float on the interface. The tundish's dead zone volume reached 30.87 percent; the tundish's effective utilization is very low. So, the tundish which in used by the Xin Yu Iron and Steel Group need to be optimized.In the optimization programs, setting the permeability of porous brick at the tundish's bottom of which installing turbulence inhabiting pouring pad and"U"-diversion wall (the cut angel is 60°, up tilt 5°), when the permeability of porous brick away from the tundish's symmetry plane 2400mm, blow-in the argon to the tundish at the gas blowing rate of 1.62m3/h, in the tundish forming the bubble curtain. The effect of the mixing and the floating effect of non-metallic inclusions is best. The tundish's dead zone volume is only 14.26 percent; the plug flow volume is 29.69 percent. This tundish which is be optimized have increased the effective utilization, to the benefit of the production of pure steel.