(1. School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, Shaanxi, China;
2.School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China）
Abstract： 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 taptotap time, reduce the mass percent of FeO in slag and the product of carbonoxygen. Meanwhile, as the bottom blowing gas flow rate increasing from 100 to 150 L/min, the metallurgical effects were further improved.
