连铸保护渣渣膜结构的数学模拟及生产初步应用

Mathematical simulation on slag film structure of mould flux and preliminary application of production

为了指导生产实践,以结晶器内保护渣渣膜为研究对象,应用传热学原理,模拟分析了保护渣渣膜结构的变化规律。计算结果表明:结晶器内自弯月面向下,液渣层厚度先增大后减小;在液渣膜厚度减小时,结晶体开始形成,并随着温度的降低,结晶结束;此后,玻璃体开始大量生成,形成玻璃层。构建的数学模型对于改善铸坯质量和优化保护渣设计均具有理论指导意义。

In order to guide the practical production, the paper takes the slag film in the mold as the research object, and applies heat transfer theory to simulation analysis the variation regularity of slag film structure. The results show that： from meniscus down in the mold, liquid slag layer thickness increases first and then decreases, the crystal be- gan to form as soon as the liquid slag film thickness decreases, with the decrease of tem- perature, crystallization is the end and vitreous body begins to form the layer of glass. At the same time, mathematical model is proposed theoretical significance for improving the quality of casting billet and optimization design of slag.