Physical Modeling Research on the Stirring Characteristics and Mixing Effect of an 80t Converter
With the purpose of optimizing the mixing effect of the steel bath,hydrodynamic model experiments which were designed based on the similarity theory have been carried out in a 1/6th scaled down model of an 80t converter.The flow characteristics under the condition of top blowing,bottom blowing and top-bottom blowing process were discussed,and the influence rules of different technical parameters including the oxygen lance height,the flow rate of the top-blown oxygen,the number of the nozzles of the oxygen lance,the configurations of bottom nozzle and the flow rate of bottom-blown gas on the mixing effect of the steel bath were also investigated.The results showed that a better performance of top blown converter can be achieved by the means of using oxygen lance with four nozzles and controlling the oxygen lance height ranging from 1000mm to 1360mm and keeping the flow rate of topblown oxygen within 15000Nm3/h to16000Nm3/h.As for bottom blown converter,the asymmetric configurations are more beneficial to obtain a desired agitation effect for the converter bath than the symmetric ones,at the same time the flow rate of bottom-blown gas should be controlled within the scope of 45-76Nm3/h.Furthermore,through variance analysis,the optimal operating parameters of combined blown converter were obtained as follows: lance height 950mm,oxygen flow rate 14000Nm3/h,five nozzles oxygen lance,bottom nozzle configuration B(the layout of bottom nozzles on 0.5D with the axis angle of 30°)and bottom gas flow rate 100Nm3/h.In addition,the agitation energy in the process of top blowing,bottom blowing or combined blowing and its effect on bath mixing were analyzed,and then the estimation model for mixing time of the steel bath in basic oxygen furnace was proposed using the method of nonlinear curve fitting to analyze the experiment data,and its expression is τ =169.72ε A-0.35.
converter physical modeling stirring characteristics mixing effect
Lingling CAO Zhou WANG Qing LIU Xinchun LU Feiming XIE
State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100 State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100 Fangda Special Steel Science and Technology Co.,Ltd.,Nanchang 330012,Jiangxi,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
171-174
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）