EBT区域底吹流量变化对电弧炉炼钢的影响

 电弧炉底吹是加速熔池流动、减少EBT区域死区、改善炼钢反应的重要手段，底吹流量变化会影响电弧炉熔池流动和冶金效果。利用Fluent软件研究了100 t电弧炉EBT区域附近不同底吹流量的熔池流动特性，发现当EBT区域底吹流量从100增加至150 L/min时，熔池平均流速提高18.03%，死区面积减少22.06%；当进一步增加至200 L/min时，熔池流速和死区面积变化幅度降低。在此基础上，通过100 t电弧炉炼钢试验研究了不同底吹条件下的冶金效果，发现底吹可显著降低电弧炉钢铁料消耗和石灰消耗，缩短冶炼周期，降低炉渣FeO质量分数和钢液碳氧浓度积；随着EBT区域底吹气体流量从100增加至150 L/min，冶金效果进一步得到改善。

Effect of bottom blowing flow rate near EBT area on EAF steelmaking

 Bottom blowing is an important technology to accelerate flow, reduce EBT dead zone and improve steelmaking reaction during EAF steelmaking process. The change of bottom blowing flow rate will affect the molten bath flow and metallurgical effect. The flow characteristics of the molten bath with different bottom blowing flow rates near the EBT area in a 100 t EAF were simulated by Fluent. When the bottom blowing flow rate near the EBT area increased from 100  to 150 L/min, the average flow velocity of the molten bath was improved by 18.03%, and the area of dead zone was reduced by 22.06%. When the flow rate further increased to 200 L/min, the flow velocity and the dead zone area were changed mildly. On this basis, industrial tests were carried out in a 100 t EAF. It was discovered that the bottom blowing gas could significantly reduce the consumption of steel material and lime, shorten the tap to tap time, reduce the mass percent of FeO  in slag and the product of carbon oxygen. Meanwhile, as the bottom blowing gas flow rate increasing from 100  to 150 L/min, the metallurgical effects were further improved.