Abstract
Tundish plasma heating is an effective method for achieving steady casting with low superheat and constant temperature. In order to study the flow field, temperature field in tundish heated by plasma, a three-dimensional transient mathematical model was established in the present work. A four-strand T-type tundish in a steelmaking plant was used to explore the changes in the flow field and temperature field of molten steel in the tundish under different plasma heating powers. The results showed that plasma heating affected the flow state of molten steel. It could eliminate the short-circuit flow at outlet. When the plasma heating was 500 kW, the molten steel had an obvious upward flow. The turbulence intensity was improved and distributed evenly with an increase in plasma heating power. In the prototype tundish, the temperature of the outlet was dropped by nearly 2–3 K within 300 s. With the increase of plasma heating power, the low temperature area in the tundish gradually was decreased. When the heating power was 1000 kW, the temperature difference of two outlets was 0.5 K and the overall temperature distribution was more uniform. The research results have a certain guiding significance for the selection of the actual plasma heating power on site.
Highlights
A three-dimensional transient mathematical model of tundish plasma heating was established to systematically study the effect of plasma heating power on the flow field and temperature field in tundish heated by plasma
In 5 min, the temperature was dropped by 1.86 K without plasma heating and it can be assumed that as the pouring process goes on, the temperature will continue to decrease.10When of 12 the tundish was heated by plasma, the temperature variations had the same trend in 300 kW, 500 kW and 1000 kW
T-type tundish for continuous casting were investigated using numerical simulations
Summary
With the further development and promotion of continuous casting technology, continuous casting process has a great influence on the quality of the finished steel products. There was only a single plasma torch in this device, which could result in local high temperature areas. There were few studies on the mechanism of plasma heating molten steel in tundish, especially the flow field and temperature field in a four-strand tundish heated by plasma. Used a water model to study the steel flow and heat transfer in tundish heated by plasma They used a turbulent k–ε mathematical model to interpreted the water model experimental results. The results showed that setting a bottom blowing device under the plasma heating point of the tundish can solve the problem of poor direct heating effect in a single plasma torch. A three-dimensional transient mathematical model of tundish plasma heating was established to systematically study the effect of plasma heating power on the flow field and temperature field in tundish heated by plasma
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