浸入式水口对板坯结晶器卷入渣滴影响的物理模拟

doi:10.13228/j.boyuan.issn1006-9356.20230030

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Abstract The slag entrainment in mold is the main cause of surface defects of slab. The flow field inside mold is closely related to the occur of slag entrainment and the behavior of entrained slag droplet. The structure of submerged entry nozzle (SEN) has direct effect on the flow of molten steel. Therefore, it is of great significance to study the influence of SEN on fluid flow and slag entrainment in the mold. A water model with 1∶2 scale of slab continuous casting mold was established to systematically study the effect of inner diameter, outlet angle, bottom shape and immersion depth of submerged entry nozzle on the slag entrainment. The slag entrainment behavior at the meniscus and the distribution of fluid field were measured using the charged coupling devices camera (CCD camera) and the particle image velocimetry(PIV).At the same time, the data were analyzed visually using image post-processing software. The critical casting speed of slag entrainment under different working conditions was determined, and the diameter variation of entrained slag droplets with different SEN parameters and different gas flow rates were quantified. The results show that the trajectory of entrained slag droplet is related to the flow field in the mold. In a certain range, increasing the SEN inner diameter, increasing the SEN outlet angle, increasing the SEN immersion depth and adopting the concave bottom of SEN can reduce the probability of slag entrainment in mold, reduce the diameter of entrained slag droplets, and shorten the time for droplet floating up to the slag layer. This study could provide technical guidance for optimizing the process parameters of continuous casting.

Key words： continuous casting mold entrainment diameter of slag droplet structure of submerged entry nozzle particle image velocimetry water model

Received: 18 January 2023

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	Articles by authors
	PENG Xiaoxuan
	SUN Yu
	DUAN Haojian
	CHEN Wei
	ZHANG Lifeng

Cite this article:

PENG Xiaoxuan,SUN Yu,DUAN Haojian等. Physical simulation for effect of submerged entry nozzle on entrained slag droplet in slab mold[J]. China Metallurgy, 2023, 33(6): 43-53.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230030 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I6/43

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