【摘要】 进行了 90t复吹转炉水模实验 ,研究了枪位、底吹流量对熔池搅拌、喷溅、冲击深度的影响。当底吹流量控制在 0 .4 5～ 0 .75Nm3 /h ,枪位在 2 2 9mm时熔池混匀时间短 ,且吹练时喷溅量少。顶底复吹条件下 ,较浅的熔池冲击深度就可达到良好的搅拌效果 ,有利于减少对炉底的冲击。采用铝粉示踪法显示了不同吹炼条件下熔池的流谱 ,同纯顶吹相比 ,顶底复吹时 (4个元件底吹 )炉壁面附近区域搅拌明显改善 ,凹坑下面区域的流体螺旋向上流动。更多还原

【Abstract】 The effect of lance level and bottom blowing rate on bath stirring, splashing and penetrating depth has been studied at a 90t combined blown converter using water model. Results show that when the bottom blowing rate is controlled within the limit of 0.45～0.75 Nm 3/h and the lance level is maintained at 229mm both the mixing time of bath and the extent of splashing will be reduced. Under the combined blown conditions better stirring effect can be achieved even with a shallow penetrating depth compared to the single top blown process and therefore the impact on the furnace bottom will be accordingly relieved. The flowing pattern of bath under the different conditions has been investigated using Al powder as tracer. It is found that the stirring near the furnace wall has been drastically improved and the fluid under the hollow zone flows up spirally in the process of top-bottom combined blowing with 4 blowing elements compared iwth top blown process.更多还原