Water Modelling of the Blowing Effect in Ladles with Purging Plugs of Different Slit Structure and Distribution
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The purging plug is an indispensable refining component; its slit structure and distribution are important factors that influence refining efficiency. We have fabricated a purging plug with adjustable slit structure and we have studied the mixing time of molten steel and the removal rate of inclusions in the ladle with a purging plug of different slit structure and blowing parameters by water modelling. The effects of the slit width, slit distribution and blowing parameters on the application of the purging plug in a ladle are discussed herein. The results show that if the gas flow rate is less than 0.89 m3/h, the mixing time difference is obviously larger; however, when the gas flow rate reaches or exceeds 0.89 m3/h, the mixing time difference becomes very small. When the slit width is more than 0.05 mm, the mixing time and inclusion removal rate are improved significantly. A smaller slit width is better for the formation of small bubbles and the removal of small inclusions, while bigger slits are conducive to stirring and a removal rate of inclusions of more than 50 µm. Bottom blowing using a d-type purging plug with collocation of slits with different widths and interval gap distribution not only ensures the removal rate of inclusions of more than 50 µm, but also highly improves the removal rate of inclusions of less than 50 µm. Thus, the total inclusion removal rate increases significantly and is as high as 67.21%. In order to guarantee good refinement, the distance of the location of the purging plug from the centre of the circle should be greater than 0.4 R, which is a critical location for better blowing metallurgy and avoidance of more serious wear of local lining refractories.
Keywordsladle purging plug slit structure and distribution water modelling inclusion removal
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- Cramb, A.W.: High purity, low residual and clean steels. Impurities in Engineered Materials: Impact, Reliability and Control, ed. by C.L. Briant, John Wiley, CRC Press, Boca Raton, USA (1999) 49–89 [ISBN: 9780824799656]Google Scholar
- Cui, J., Huang, Z., Zheng, Y.: Development of clean steel technology at Baosteel. Baosteel Tech. (2009) [s1] 12–18Google Scholar
- Huang, A., Gu, H.Z., Wang, N., et al.: Mathematical and physical modelling of purging plugs and its application for refining ladles. Interceram-Refractories Manual (2012)  96–102Google Scholar
- Huang, A., Wang, N., Gu, H.Z.: Research on mathematical simulation of inclusion removal and mechanism effect for gas curtain tundish. Journal of Iron and Steel Research Internat. 15 (2008) [s1] 478–482Google Scholar
- Huang, A., Vollmann, S., Harmuth, H.: Towards modelling of slag entrainment in gas stirred ladles by LES. STEELSIM, 5th International Conference Simulation and Modelling of Metallurgical Processes in Steelmaking, Ostrava, CZ, Sep 10–12 (2013)Google Scholar