LF精炼过程中通电升温阶段底吹氩方式的优化

Optimization of Argon Bottom Blowing During Electric Heating Stage of LF Refining Process

在LF(ladle furnace)精炼过程的通电升温阶段多采用双喷嘴等流喷吹的吹氩方式.本文提出一种双喷嘴差流吹氩的底吹方式,以某钢厂135 t钢包为原型设计1∶4非等温水模型实验平台,在总流量相同的情况下进行底吹比例为1∶1,2∶1和3∶1的温度均匀化实验,结果表明底吹比例为2∶1时的各监测点无量纲温差最小,均匀化效果最好.建立流动-传热耦合数学模型对实验结果进行验证,结果表明在总流量相等的情况下,底吹比例为1∶1,2∶1和3∶1时流动死区占比分别为14.1%,9.1%和9.8%,温度死区占比分别为6.2%,2.6%和0.3%,2∶1差流底吹方式在活跃流场和促进温度均匀化方面具有优势.

During the electric heating stage of the LF(lalde furnace)refining process,dual‑nozzle equi‑flow argon blowing is often used.This paper proposes a bottom blowing method of dual‑nozzle non‑equi‑flow argon blowing.A 1∶4 non‑isothermal water model experimental platform was designed based on a 135 t ladle in a steel plant.Under the same total flow rate,temperature homogenization experiments were conducted with bottom blowing ratios of 1∶1,2∶1 and 3∶1.The results show that the minimum dimensionless temperature difference and the best homogenization effect were observed at each monitoring point when the bottom blowing ratio was 2∶1.The coupling mathematical model for flow and heat transfer was established to verify the experimental results.The results show that under the same total flow rate,the proportion of flow dead zone was 14.1%,9.1%,and 9.8%respectively when the bottom blowing ratio was 1∶1,2∶1 and 3∶1,and the proportion of temperature dead zone was 6.2%,2.6%,and 0.3%,respectively.The 2∶1 non‑equi‑flow bottom blowing method has advantages in active flow field and promotes the temperature uniformity.