冷凝型矿热炉三维热力耦合过程数值模拟

Numerical simulation on three-dimensional thermal-mechanical coupling process of condensing submerged arc furnace

为解决冷凝型矿热炉熔炼过程中应力集中和热变形过大的问题,建立了一个三维冷凝型矿热炉电磁-热-应力多物理场耦合模型,预测了冷凝型矿热炉中电流密度的分布,并研究了冷却水温度对冷凝型矿热炉应力、应变以及热变形的影响.利用弹塑性力学理论研究了应力、应变和热变形与温度间的作用机制.结果表明:电弧区电流密度分布满足邻近效应和趋肤效应;当冷却水温度由288 K升至313 K时,炉壳在喷淋区的温度随之升高了23 K,炉壳最大应力由193 MPa减小至175 MPa,最大变形量由7.09 mm增至7.45 mm;炉壳最大应力、应变和变形量均位于z=3.2 m处;炉壳上的轴向应力和环向应力受高温电弧影响呈现周期性变化,且环向应力总是大于轴向应力.

To solve the problems of thermal stress concentration and excessive thermal deformation during the smelting process of condensing submerged arc furnace,a three-dimensional coupled model of electromagnetism-thermo-stress multi-physical field has been established.The distribution of current density in the condensing submerged arc furnace is predicted,and the influence of cooling water temperature on the stress,strain,and deformation of the furnace body is also studied.In addition,the mechanism between stress,strain,thermal deformation,and temperature is studied by using the theory of elastoplastic mechanics.The results show that the current density distribution satisfies the proximity effect and skin effect in the arc area.With increasing the cooling water temperature from 288 K to 313 K,the temperature of the furnace shell in the spray zone increases by 23 K.Meanwhile,the maximum stress of the shell decreases from 193 MPa to 175 MPa,and the maximum deformation increases from 7.09 mm to 7.45 mm.The position of maximum stress,strain,and deformation on the shell is located at a height of z=3.2 m.The axial stress and circumferential stress on the furnace shell show periodic changes under the influence of high-temperature arc,and the circumferential stress is always greater than the axial stress.