Effect of Bottom Blowing Mode on Fluid Flow and Mixing Behavior in Converter

Metals

Wenhui Lin¹  Jiangshan Zhang¹  Qing Liu¹  Jiankun Sun¹  Xiaoming Feng² 

[1] State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Beijing 100083, China;Technology and Research Center, Xinyu Iron and Steel Co., Ltd., Metallurgical Road 1, Xinyu 338001, China;

关键词: converter;    hydraulic experiment;    numerical simulation;    bottom blowing;    fluid flow;    mixing time;   

DOI  :  10.3390/met12010117

来源: DOAJ

【 摘 要 】

Bottom blowing agitation plays a crucial role in improving the reaction kinetics condition of molten bath during the steelmaking process. Herein, the influence of bottom blowing mode on the flow and mixing characteristics of molten bath and the abrasion characteristics of refractory lining in a 6:1 scaled-down model of a 100 t converter were investigated using physical and numerical simulations together. Eight bottom blowing modes were designed (uniform, three-point linear co-direction, three-point linear unco-direction, two-point linear, circumferential linear, A-type, V-type, and triangle alternating). The results indicated that bottom blowing mode has a significant effect on the local flow field at the inner ring of bottom tuyeres, the velocity interval distribution, and the turbulent kinetic energy, which in turn determines the tracer diffusion path and rate as well the mixing time of molten bath. Reasonable non-uniform bottom blowing modes promote the interaction between the various stirring sub-zones of the molten bath. Among them, the three-point linear co-direction mode and A-type mode have the highest mixing efficiency under the conditions of bottom blowing and combined blowing, respectively, which is superior to the uniform mode. In addition, the bottom blowing mode changed the location and degree of abrasion of the refractory lining, and the total abrasion of the non-uniform mode was reduced. The average value and fluctuation degree of integral wall shear stress for the A-type mode were minimal.

【 授权许可】

Unknown