Effect of submerged entry nozzle on molten steel flow in thin slab mold
In order to adapt to the new production line of a steel plant and improve its continuous casting and rolling efficiency,the influence of the number of submerged nozzle openings on the metallurgical behavior inside the thin slab crystallizer was mainly explored and revealed.Three-dimensional numerical simulation of flow and heat transfer in a thin slab funnel mold with high casting speed(5 m/min)was carried out by using Ansys Fluent.The simulation results were analyzed and compared,and the optimal nozzle was selected based on the fluctuation index F of the liquid surface.The results show that in the flow field analysis,the maximum flow velocity at the meniscus of the two hole nozzle is 0.709 m/s,while the maximum flow velocities at the three hole nozzle and the four hole nozzle are similar,0.575 and 0.578 m/s,respectively.The two hole nozzle causes greater disturbance to the free liquid surface.In temperature field analysis,the overall temperature range of the top surface of the two hole nozzle is relatively high,and the maximum temperature occurs at the narrow wall.The maximum temperature on the top surface of the three hole and four hole nozzles is below 1 810 K,and the high temperature area of the three hole nozzle is relatively large,which is conducive to the melting of the protective slag.Combined with the analysis of F number,the liquid level fluctuation indexes of the three kinds of nozzles were 4.09,2.65 and 2.88,respectively.The value of F3 in three orifices is the smallest(F3＜F4＜F2).And F3=2.65＜3,indicating that the fluctuation pattern under this water outlet condition is better than the optimal data of the conventional water outlet for slab,and the three hole water outlet was ultimately selected as the optimal water outlet.
thin slabhigh casting speedfunnel moldnumerical simulationliquid level fluctuation index
NETL
NSTL
万方数据
维普
