不同工艺参数下电渣重熔过程的数值模拟

为研究工艺参数对电渣重熔过程的影响,建立了能够考虑电磁现象并耦合动量和热量传输的三维瞬态数学模型,运用商业软件Fluent进行了模拟研究,计算值与测量值吻合较好。模拟结果表明:在极间距相同的2种工况下,监测点的电流密度值基本相同,说明当渣池深度变化时,可以通过调节电极浸入深度,以符合设定的操作制度。电势降主要发生在渣池区域,渣金界面处的电压仅为0.1V;焦耳热最大值出现在电极端角与渣池接触区域,最小值出现在渣金界面;电磁力最大值出现在电极边角附近,随着纵向深度增加,轴向分量越来越小。极间距为20mm时,电极端角与渣池接触区域的速度和温度均出现最大值,金属熔池深度也最大,其大小分别为0.045m/s,2 250K,41.5mm。

Numerical simulation of electroslag remelting process under different process parameters

In order to study of process parameters on the influence of the electroslag remelting process, a three- dimensiona transient- state mathematical model was developed that accounts for electromagnetic phenomena and coupled momentum and heat transfers, the simulation study by using the commercial software Fluent. The calculated value is in good agreement with the measured value. The simulation results indicate that the value of current density of the monitoring points is the same under the same polarity distance, that when the slag pool depth change, the immersion depth can be adjusted to conform to the set of operating system. Voltage drop mainly occur slag pool region and the value is only 0.1V at the slag- metal interface; the maximum joule heat is in corner of electrode- slag and the minimum value is distributed at the slag- metal interface; the maximum electromagnetic force is in the vicinity of the edge of the electrode, with the increase of vertical depth, the axial component is getting smaller and smaller. When the polarity distance is 20mm, velocity and temperature in corner of electrode- slag and depth of metal pool have a maximum value, respectively, 0.045m/s, 2250K, 41.5mm.