直流矿热炉熔炼硅锰合金温度场-电磁场数值模拟

采用直流供电成为电弧炉熔炼硅锰合金的发展方向.由于直流供热强度增加,炉衬的温度分布及传热规律需要重新考察及设计.建立了炉衬与炉内熔池耦合的三维非稳态传热模型,研究给定不同外加电压时直流矿热炉炉内的温度场和电磁场.研究表明,外加电压由100 V增大到300 V后,电弧区的最高温度增大了 150％.底电极中心与炉壁的温差T...

Numerical simulation of temperature field and electromagnetic field for smelting silicomanganese in DC submerged arc furnace

Direct-current (DC) power supply has become the development direction for the melting of silicomanganese in electric arc furnaces. The temperature distribution and heat transfer law of the furnace lining needs to be re-examined and redesigned because of the increase of direct current heating intensity. A three-dimensional unsteady heat transfer model of the furnace lining coupled with the furnace melt pool was established to study the temperature and electromagnetic fields in a DC submerged arc furnace under different applied voltages. The results showed that when the applied voltage increased from 100 V to 300 V, the maximum temperature increased by 150% in the arc zone. The temperature difference between the bottom electrode center and the furnace wall increased quadratic linearly with the increase of applied voltage, and the fitting curve was T_GH=0.004 29U2-1.162 29U+135.2. The temperature difference between the center of bottom electrode and the outer wall of furnace lining increased quadratic linearly with the increase of applied voltage, and the fitting curve was T_GI=0.005 63U2-1.369 43U+1 188.4. Therefore, while improving the smelting efficiency, the loss of bottom electrode caused by high temperature and the influence of large temperature difference on the bearing capacity of the lining material should be considered. With the increase of applied voltage, the temperature difference in the furnace was too large, which will cause uneven heating of carbon bricks. When the applied voltage was 200-250 V, it was closest to the optimal index of actual smelting.