南钢110t转炉顶吹氧枪喷吹特性模拟与应用研究

SIMULATION AND APPLICATION RESEARCH ABOUT THE FLOW FIELD CHARACTERISTIC FOR TOP-BLOWING LANCE IN 110 t CONVERTER STEELMAKING PROCESS

本研究利用Fluent软件对南钢110t转炉顶吹氧枪喷头参数对超音速射流流场分布特性影响进行三维数值模拟,并将研究结果应用到南钢110t转炉常规冶炼过程。研究结果表明,13.5°四孔氧枪在1.7m处(理论枪位)保持较高的射流速度,且射流有效冲击半径最大。即13.5°四孔氧枪可有效提高氧气与熔池的接触面积,提高氧气利用效率。基于412炉次冶炼数据结果发现,相比于原氧枪,在采用设计流量为24000m^3/h,喷孔夹角13.5°的优化后氧枪时,在相同冶炼条件下,110t钢水的平均冶炼时间及终点碳氧积分别减小1.5min及0.0003,熔池脱磷率提高4.1%,终渣TFe含量下降1.7%。

In this research, the simulation model for an oxygen lance for the 110 t convert has been built, and the application industrial research was carried out due to the simulation results. The result showed the four-holes oxygen lance with 13.5° injection angle could main a high-velocity level at the axial location being 1.369 m (theoretical lance height) away from nozzle tip, and also achieved the best impaction radius. That mean the four-holes oxygen lance with 13.5° injection angle could improve the surface area between the oxygen jet and molten bath, resulting a bigger utilization rate of oxygen. Based on the results from 4 126 heats for the oxygen lance using design flow rate being 24 000 m^3/h with 13.5° injection angle, the smelting time and [C]·[O] was reduced by 1.5 min and 0.000 3 respectively, the dephosphorizing rate was increased by 4.1%, and the TFe in the finishing slag was decreased by 1.7%, when compared to the original oxygen lance.