交流三相电熔镁炉的最佳运行分析

针对电熔镁炉是具有大时滞、强非线性、多变量的复杂系统,现场控制需要一个准确的工作模型的情况,以电熔镁炉的电弧电阻与熔池电阻为切入点,分析了其工作机理,建立了熔池功率场数学模型;提出了针对不同阶段优化操作方法、合理布料和改变熔池形状可提高成品生产率及质量合格率;对方镁石在电熔镁砂熔体中的结晶过程的研究表明,在电熔镁炉外部增加温控手段是获取优质电熔镁砂的关键.

Analysis of Optimal Operation about Purifying Magnesium Oxide with Three-phase AC Electric Smelting Furnace

To the electric smelting furnace for purifying magnesium oxide which is a complex multivariable system with the characteristics of large time-delay and strong nonlinearity,an accurate model for field control is established.Based on the course of electric smelting furnace starting from studying the arc-resistance and bath resistance,a mathematic model of smelting bath power field is set up.The reasonable distribution,bath shape change and optimal operation methods in different stages are essential for improving productivity and quality.Based on studying the periclase crystallization process in the electric magnesite melt mass,the temperature control from outside of the electric smelting furnace is the key factor to produce high-quality electric melt magnesite.