连铸浇注过程滑动水口开度控制及喷钢分析

doi:10.13228/j.boyuan.issn1006-9356.20230394

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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.

Key words： Bernoulli's principle continuity equation slide gate opening steel spraying feedforward-feedback control

Received: 20 June 2023

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	Articles by authors
	ZHANG Yumeng
	CHENG Shusen
	FENG Yongping
	LI Jipeng

Cite this article:

ZHANG Yumeng,CHENG Shusen,FENG Yongping等. Opening control of slide gate in continuous casting and analysis of steel spraying[J]. China Metallurgy, 2023, 33(12): 56-65.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230394 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I12/56

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