矿热炉内部多物理场的数值模拟

Numerical Simulation of Multi-Physical Field Inside Submerged arc Furnace

为了研究大型矿热炉内电/磁/热多物理场耦合作用下熔池内的温度分布情况,建立了48 MW大型矿热炉三维仿真计算模型。基于计算流体力学(CFD)、多相流传热传质机理,深入探究大型矿热炉电/磁/热多物理场耦合作用下矿料-熔渣-合金层的多相流传热传质机理。预测了矿热炉熔池内部温度分布情况,揭示了温度分布的影响因素。结果表明,电流密度的分布会受到集肤效应和临近效应的影响,电流密度最大值出现在电极端部的内侧壁处;熔池内焦耳热主要分布在电极端部附近;高温区主要集中在电极附近的坩埚区内,并且随着电极插入深度的增加,合金溶液的最大温度值会逐渐增大。

In order to study the temperature distribution in the molten pool under the coupling action of electric/magnetic/thermal multi-physics in the large-scale submerged arc furnace,a three-dimensional simulation calculation model of the 48 MW large-scale submerged arc furnace was established.Based on computational fluid dynamics(CFD)and the mechanism of multiphase flow heat and mass transfer,the in-depth exploration of the multiphase flow heat and mass transfer mechanism of the mineral material-slag-alloy layer under the coupling of electric/magnetic/thermal multi-physical fields in large-scale submerged arc furnaces are researohea.The temperature distribution inside the molten pool of the submerged arc furnace is predicted,and the influencing factors of the temperature distribution are revealed.The results show that the distribution of current density will be affected by the skin effect and proximity effect.The maximum current density appears at the inner wall of the electrode end;the Joule heat in the molten pool is mainly distributed near the electrode end;the high temperature zone is mainly concentrated in the electrode vicinity of the crucible area,and as the electrode insertion depth increases,the maximum temperature of the alloy solution will gradually increase.