直流矿热炉熔炼硅锰合金温度场-电磁场数值模拟  

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

作　　者：刘顺娣 李宝宽 于洋 韵晨成 欧海彬 李奇 LIU Shun-di;LI Bao-kuan;YU Yang;YUN Chen-cheng;OU Hai-bin;LI Qi(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《中国冶金》2022年第1期104-111,共8页China Metallurgy

基　　金：国家自然科学基金资助项目(51934002)。

摘　　要：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_(GH)随外加电压U增大呈二次线性增加,拟合曲线为T_(GH)=0.00429U^(2)-1.16229U+135.2;底电极中心与炉衬外壁的温差T_(GI)随外加电压U增大呈二次线性增加,拟合曲线为T_(GI)=0.00563U^(2)-1.36943U+1188.4。故在提高炉内熔炼效率的同时,应考虑炉内高温对底电极带来的损耗以及炉内温差过大对矿热炉炉衬材料承受能力的影响。外加电压增大导致的炉内温度差过大,会造成炭砖的受热不均匀。结合实际冶炼情况,选择200~250 V的外加电压,最接近实际冶炼的最优指标。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)=0.00429U^(2)-1.16229U+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)=0.00563U^(2)-1.36943U+1188.4.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.

关 键 词：直流矿热炉 硅锰合金 数值模拟 外加电压 温度场 电磁场 

分 类 号：TF792[冶金工程—钢铁冶金]