Coupled Simulation Of Flow Field And Temperature Field For Heavy Plate Continuous Casting

The mold, known as the "heart" of continuous casting machine, is a key component of continuous casting equipments. It is the birthplace of most surface and internal defects. Continuous casting process is an integrated process that relates to high temperature and complex physical and chemical phenomena. Solidification, heat transfer and fluid flow are also included. Up to now, there are no effective means to test accurately. Therefore, mathematical simulation is an efficient measure to predict related phenomena of continuous casting and optimize the parameters of continuous casting process.Based on the continuous casting process and the mold parameters in Tangshan Heavy Plate Ltd, the liquid steel flow, the liquid level fluctuations and the steel solidification conditions about heavy plate are researched. 1) Based on ANSYS software and the six turbulent numerical models, a coupled model of flow field - temperature field is established. 2) Mold tested uses water model to validate to improve the accuracy and reliability of simulation. 3) By using the coupled model, the influencing rule of continuous casting process parameters and outlet obliquity of nozzle of heavy plate mold molten steel behavior are researched and heavy plate continuous casting process parameters and outlet optimization parameters are given.The results show that: by using ANSYS software, a flow field - temperature field coupled model is established which accords with water-model. Outlet obliquity of nozzle, pulling rate and immersion depth of nozzle have a great influence on the flow field. Turbulent kinetic grows along with pulling rate increasing, which is bad for inclusion floating and shell formation. As the depth of immersion is increased, circumfluence of steel is strengthened, under shell is eroded easily, shell thickness is non-uniform, liquid level is quite steady and molten slag can not melt well. Oversize obliquity of nozzle is not a favor for growth of primary shell. But undersize obliquity of nozzle can slower flow of liquid steel and molten slag can not melt well. Reasonable heavy plate continuous casting process parameters are as follows: immersion depth of nozzle is 0.140~0.150m, speed is 1.20~1.40m/min and outlet obliquity of nozzle is 10°~15°.