Analysis of critical slag entrapment speed at the steel–slag interface

ABSTRACT

Based on particle image velocimetry (PIV) technology, the process and flow field characteristics of slag entrapment under the condition of critical slag entrapment are investigated by water model. The change of interface flow field at the slag entrapment process from the occurrence to end of critical slag entrapment is analysed, and the influence of kinematic viscosity of slag on critical slag entrapment velocity is quantitatively analysed. The results show that the kinematic viscosity of slag has an important influence on slag entrapment. The critical blowing flow and critical speed increase with the increasing of the viscosity. Based on the law of conservation of energy and the traditional theoretical calculation models, an improved formula for critical slag entrapment speed is proposed in this study, which further considers the thickness and viscosity of the slag.

KEYWORDS:

• Entrapment slag
• steel–slag interface
• critical speed
• PIV
• kinematic viscosity
• water model
• flow field
• the thickness of the slag‌

Acknowledgement

The authors appreciate the financial support for this work from the National Natural Science Foundation of China (U1660113) and the China Scholarship Council (grant number 201806465053).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors appreciate the financial support for this work from the National Natural Science Foundation of China (U1660113) and the China Scholarship Council (grant numer 201806465053).