Structure Optimization Of Oxygen Lance And Impact Mechanism In The Molten Bath

The factors of molten steel flow field and the gas jet are significant to steelmaking process.The study of the function of the oxygen lance optimization on molten bath is practical significance.Based on the applied parameters of four hole oxygen lance and 50 t converter in Tangshan Iron & Steel plant,GAMBIT and FLUENT simulation were performed to explore the influence of orifice spacing on oxygen lance jet characteristics and the impact on the molten bath.VOF and DPM models were used to simulate the action mechanism of gas jet on molten bath and refractory erosion.The simulated results indicate that the increase of orifice spacing of non-variable angle oxygen lance and variable angle oxygen lance slightly impact on the core section length and axis jet rate.However,the increase of orifice spacing enhanced the departure distance and systematization length decrease the splash amount and increase the effective impact area.The mixing time of non-variable angle oxygen lance A+,A,A-and variable angle oxygen lance D+,D,D-were 50 s,51s,54 s,41s,43 s and 48 s,respectively,in the lance level of 1.3m.The increase of orifice spacing enhance the stirring strength effectively that shorten the mixing time of molten bath.The VOF and DPM models were used to establish the simulation method of the refractory material erosion in steelmaking process.It indicated that the erosion degree variation on the converter bath wall shown "W" type.The refractory material erosion degree decreased with the increase of molten bath depth and lance level.While,the erosion degree enhanced with the increase of orifice spacing.Comparing the nine lance nozzle with different nozzle inclination angle,it can be seen that the erosion degree enhanced with the increase of nozzle inclination angle.Moreover,the erosion degree under the function of 1owas higher than that under 0.5o.Except the nozzle F,the erosion degree under the function of variable angle oxygen lance nozzles is generally higher than non-variable angle oxygen lance nozzle A.The nozzle E is the highest.