方坯连铸机结晶器凝固传热的数学模型

研究和开发了方坯连铸机结晶器非稳态凝固传热的数学模型,预测铸坯温度分布和凝固状态,模型考虑了凝固时结晶器气隙的存在,使得传热不均匀,同时,采用等效比热法处理了凝固前沿产生的结晶潜热·以生产厂方坯为研究对象,得出了温度分布规律、凝固坯壳生成规律,分析了拉速对铸坯温度和坯壳厚度的影响·结果表明,经模型计算得出的温度、坯壳厚度值与现场测定的温度、拉漏数据基本相符·

Mathematical Model of Solidification and Heat Transfer in Mould of Continuous Caster for Blooms

A mathematical model of heat transfer and unstable solidification in the mould of continuous caster for blooms was developed and applied to predict the temperature distribution and solidified shell thickness profile in the mould of continuous caster for blooms. In view of the air gap in the mould and heat transfer is thus non-homogeneous, a heat exchange model related to the air gap is introduced. Meanwhile, the equivalent specific heat method is introduced to deal with the latent heat of fusion in the front of solidification phase. The model has been applied to calculate the temperature profile and solidified shell thickness in the mould of caster with the blooms supplied in situ as specimens. The effects of casting speed on temperature profile and solidified shell thickness are studied, which show that the data obtained by the model are in conformity with experimental measurements.