The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was ...The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was employed to simulate slag. The simulation results revealed that the gas flow rate and bath height had strong effects on the slag eye size. In particular,the thickness of slag layer played a strong role in the slag eye size. In addition,the slag eye could not be formed when the thickness of the top layer was more than 4 cm in water-silicone oil model.Besides,the section area of vessel had a great impact on the slag eye size. Industrial trials results showed a similar trend that the gas flow rate was very significant on the slag eye size. The predictions of the existing models showed larger predictions deviations compared with the experimental data. Moreover,a new model without fitting parameters was developed based on force balance and mathematical derivation,and verified by the experimental data. The new model provides the prediction with small deviations by comparing with the data acquired from cold models and industrial trials.展开更多
In order to improve argon blowing efficiency in a 40 ton ladle, numerical simulation and water simulation experiments of the bottom argon flow were performed. Relationships among the ladle mixing time, slag eye area, ...In order to improve argon blowing efficiency in a 40 ton ladle, numerical simulation and water simulation experiments of the bottom argon flow were performed. Relationships among the ladle mixing time, slag eye area, different blowing flow rates, and different blowing positions （0,0.56R, 0. 62R, 0. 67R） are discussed. Results showed that the ladle mixing time decreased when the argon blowing brick distance （from bottom center of the ladle） increased, and decreased significantly when the blowing flow increased from 70 to 130 L/h. When the blowing flow increased and exceeded 130 L/h,the stirring effect tended to be stable, and there was little effect on the ladle mixing time. The slag eye area increased as the argon brick distance increased, and was larger when the argon blow brick was near the ladle wall. Wall shear stress significantly increased as the brick distance increased and was concentrated at the slag wall near the argon flow brick;this is called the most serious erosion wall. The average wall shear increased exponentially with increasing argon blowing brick distance.展开更多
基金financially supported by National Natural Science Foundation of China(51534001,51604003)Natural Science Research Project of Anhui Province Universities(KJ2016A089)Youth Foundation of Anhui University and Technology(QZ201502)
文摘The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was employed to simulate slag. The simulation results revealed that the gas flow rate and bath height had strong effects on the slag eye size. In particular,the thickness of slag layer played a strong role in the slag eye size. In addition,the slag eye could not be formed when the thickness of the top layer was more than 4 cm in water-silicone oil model.Besides,the section area of vessel had a great impact on the slag eye size. Industrial trials results showed a similar trend that the gas flow rate was very significant on the slag eye size. The predictions of the existing models showed larger predictions deviations compared with the experimental data. Moreover,a new model without fitting parameters was developed based on force balance and mathematical derivation,and verified by the experimental data. The new model provides the prediction with small deviations by comparing with the data acquired from cold models and industrial trials.
文摘In order to improve argon blowing efficiency in a 40 ton ladle, numerical simulation and water simulation experiments of the bottom argon flow were performed. Relationships among the ladle mixing time, slag eye area, different blowing flow rates, and different blowing positions （0,0.56R, 0. 62R, 0. 67R） are discussed. Results showed that the ladle mixing time decreased when the argon blowing brick distance （from bottom center of the ladle） increased, and decreased significantly when the blowing flow increased from 70 to 130 L/h. When the blowing flow increased and exceeded 130 L/h,the stirring effect tended to be stable, and there was little effect on the ladle mixing time. The slag eye area increased as the argon brick distance increased, and was larger when the argon blow brick was near the ladle wall. Wall shear stress significantly increased as the brick distance increased and was concentrated at the slag wall near the argon flow brick;this is called the most serious erosion wall. The average wall shear increased exponentially with increasing argon blowing brick distance.
