Opening control of slide gate in continuous casting and analysis of steel spraying
ZHANG Yumeng1, CHENG Shusen1, FENG Yongping2, LI Jipeng2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Carbon Steel and Thin Plate Plant, Jiuquan lron and Steel (Group) Co., Ltd., Jiayuguan 735100, Gansu, China
Abstract：Factors affecting the opening of slide gate was studied based on Bernoulli's principle, and a feedforward-feedback control scheme of the slide gate was proposed to reduce the hysteresis problem of ladle slide gate feedback control. Meanwhile, the reasons and influencing factors of steel spraying at the joint position of ladle shroud and collective nozzle in the initial teeming stage after the ladle change were analyzed. The results show that the liquid level of ladle decreases gradually under constant casting speed. The opening of slide gate should be increased to stabilize the height of liquid level in the tundish. Reducing the diameter of slide gate and ladle shroud and increasing the argon blowing rate will increase the pressure loss when the molten steel flows through the slide gate, but the immersion depth of the ladle shroud does not affect the pressure loss of molten steel. At the beginning of casting, the gas in the ladle shroud is compressed and heated by the molten steel, so its pressure increases, resulting in steel spraying. Using a trumpet ladle shroud and reducing the immersion depth can make the pressure in the nozzle smaller and reduce the occurrence of steel spraying. This study plays an important role in realizing online real-time stable control of slide gate opening to improve the stability of liquid level in the tundish and finally improve the quality of molten steel.
张育萌, 程树森, 冯永平, 李积鹏. 连铸浇注过程滑动水口开度控制及喷钢分析[J]. 中国冶金, 2023, 33(12): 56-65.
ZHANG Yumeng, CHENG Shusen, FENG Yongping, LI Jipeng. Opening control of slide gate in continuous casting and analysis of steel spraying[J]. China Metallurgy, 2023, 33(12): 56-65.
DUSSUD M,GALICHET S,FOULLOY L P. Application of fuzzy logic control for continuous casting mold level control[J]. IEEE Transactions on Control Systems Technology,1998,6(2):246.
[18]
FENG Y,WU M,CHEN X,et al. A fuzzy PID controller with nonlinear compensation term for mold level of continuous casting process[J]. Information Sciences,2020,539:487.
[19]
LEE D,KUEON Y,LEE S. High performance hybrid mold level controller for thin slab caster[J]. Control Engineering Practice,2004,12(3):275.
[20]
WATANABE T,OMURA K,KONISHI M,et al. Mold level control in continuous caster by neural network model[J]. ISIJ International,1999,39(10):1053.
SU Z,HE Q,XIE Z. Indirect measurement of molten steel level in tundish based on laser triangulation[J]. Review of Scientific Instruments,2016,87(3):035117.
OLIA H,YANG H,CHO S M,et al. Pressure distribution and flow rate behavior in continuous-casting slide-gate systems:PFSG[J]. Metallurgical and Materials Transactions B,2022,53(3):1661.
[26]
YANG H,OLIA H,THOMAS B G. Modeling air aspiration in steel continuous casting slide-gate nozzles[J]. Metals,2021,11(1):116.
[27]
黄卫星,伍勇. 工程流体力学[M]. 北京:化学工业出版社,2018.
[28]
BÖHLE M,ETLING D,MÜLLER U,et al. Prandtl's Essentials of Fluid Mechanics[M]. New York:Springer New York,2004.
[29]
EGERTON P,HOWARTH J A,POOTS G,et al. A theoretical investigation of heat transfer in a ladle of molten steel during pouring[J]. International Journal of Heat and Mass Transfer,1979,22(11):1525.
2023, Vol. 33 
