2021 Volume 61 Issue 9 Pages 2457-2463
Owing to the heat transfer from high-temperature liquid steel, the temperature of the coil in the electromagnetic induction controlled automated steel teeming (EICAST) system in the ladle is very high, seriously restricting the service life of the coil. A novel air-mist cooling method was adopted to reduce the coil temperature in this paper. Firstly, the air-mist generating device was optimized. The results reveal that the optimized air-mist generating device can improve the cooling effect dramatically. And then, the influence of water flow and gas flow on the cooling effect of the coil was analyzed. Both water flow and gas flow affect the final coil temperature and the cooling rate of the coil. The final coil temperature is seen to decrease with an increase in the water flow, and the cooling rate of the coil increases at the initial stage. When the gas flow increases, the final coil temperature does not change much, but the cooling rate of the coil is uncommonly promoted. Finally, a combined cooling method based on the thermal cycle process of the ladle was proposed. After this method, the final coil temperature is 255°C. Compared with air-mist cooling, the final temperature difference is not large, but the coil temperature is kept in a low level for a long time by using the combined cooling. These studies will promote the application of the EICAST technology which can reduce non-metallic inclusions in steels.