摘要
对直流电弧炉底阳极用导电耐火材料时的散热状况进行了分析。揭示出底表面温度随电流密度、材料热导率、电阻率及炼钢温度增加而增加，随传热系数和底厚度增加而降低的关系。当电流密度达到一定值以上时，底阳极某处就会出现高于熔池钢液温度。在温度最高点，MgO－C材料内部发生MgO＋C→Mg↑＋CO↑的氧化还原反应，加速了底电极的损耗，甚至导致停炉。解决这一问题的方法是调节MgO－C材料的电阻率、热导率及电流密度。这对降低电耗、底电极材料的侵蚀和提高底电极的安全性、使用寿命有重要意义。
The paper analyzes heat diffusion in the bottom anode of DC-EAF. The results indicate that the bottom surfacetemperature increases as current density, thermal conductivity, specific electric resistance and steelmaking temperatureincrease, and decreases as the bottom thickness and the heat change coefficient on boundary between shell and air increase. When current density is greater than a certain number, the temperature of some points in the anode would behigher than steel liquid temperature. Gasifying reaction: MgO ＋C→ Mg(g)＋ CO(g) happens at the maximum temperature point that destroys the structure of MgO-C materials and corredes the bettom rapidly, even EAF stops working.The solution of this problem is selecting proper MgO-C materials of low specific resistance and thermal conductivity andregulating low current density. which are very important to increase the anode safety and service life and decrease anodecorrosion and power consumption.
出处
《耐火材料》
CAS
北大核心
1997年第6期311-315,共5页
Refractories
