Mathematical And Physical Simulation Of Tundish In Vertical Slab Continuous Casting

With the development of steel-making technology,continuous casting becomes the essential link during the special steels production relies on the advantage of high efficiency,low cost and others,etc.Researchers and every big iron and steel enterprises have been improving the production technologies for the continuous casting,and have been made greater progress.Among these,the role of tundish metallurgical technology in continuous casting process has received more and more regards.This paper makes tundish of vertical slab continuous casting as the research object.Mathematical and physical simulation methods were used to study on the transmission behavior in tundish.By analyzing flow field,temperature field and the trajectories,the fluid controlling devices can be designed.Then,the results provided a theoretical basis for tundish metallurgical effects.A physical tundish model scaled for 1:2 was built according to the principle of similarity simulation,and the commercial software FLUENT was used as the solver during the process of mathematical simulation.The main results are as follows:(1)The different fluid controlling devices of tundish were researched by water modeling.Then residence time distribution characteristics,flow patterns and flow fields results were analyzed.It was concluded that if there has no fluid controlling devices,there had short circuit flow in tundish,the response times and peak times were often short,the piston flow volume was small and it only accounted 9.2%of the effective volume.But on the other hand,the average residence time was short,dead zone was large,and it accounted 32.1%of the effective volume,and a considerable part of molten steel flowing along the bottom of the ladle,it would cause a poor condition of the inclusion floatation.(2)Based on the results of the 9 orthogonal experiments,the tundish structure was improved.Among these experiment results,the number 3#was the best one for the biggest piston flow volume,it accounted 24%of the effective volume,and the dead zone was the smallest,it accounted16.3%of the effective volume.By orthogonal analysis the dead zone volume fractions,it was obvious that A1B3C2D3 was the best optimally combined,that was to say the number 12#was the best,the piston flow volume accounted 24.9%of the effective volume while the dead zone accounted 14.5%.(3)By analyzing the numerical simulation results of flow field,temperature field and the trajectories for different fluid controlling devices of tundish in vertical slab continuous casting,it was obvious that the simulation result of the flow field were in good agreement with the water modeling results,they had the same tendency,and it also verified the validity of the model.(4)In different fluid controlling devices of tundish in vertical slab continuous casting,the number of 12#had the most reasonable flow field distribution,it was beneficial to the removal of inclusions.The number of 3#and 12#had the most reasonable temperature field distribution due to the small low temperature region at metal level and the uniform temperature distribution.The number of 3#,11#and 12#had a better effect on removal of inclusions.At last,the number of 12#was best fluid controlling device through synthetical consideration of flow field,temperature field and the trajectories.To sum up,after adjusting and optimizing the layout of the tundish based on the physical and mathematical simulation,the flow characteristic,distribution of temperature and inclusion removal had a better effect compared with the prototype.As a result,a theoretical basis for practical production was provided.