摘要
二冷是影响连铸机生产和铸坯质量的重要因素,针对连铸二冷区的均匀冷却问题,建立了方坯连铸机数学模型,其中包括铸坯凝固传热模型和二冷配水控制模型.采用二维有限元差分法求解凝固传热模型,分析了铸流在二冷区的凝固过程中温度场分布和凝固坯壳厚度,为建立二冷控制模型提供了依据和输入数据.建立了基于中间包钢水连续测温和有效拉速实现二冷动态前馈控制模型.该控制模型成功应用于实际铸机的二冷配水,应用结果表明:二冷动态控制模型具有比传统二冷配水控制模型更好的控制效果,铸坯质量有了明显提高.
Secondary cooling is extremely important for output of the casting machine and billet quality. To realize the uniform cooling in secondary cooling zones, the mathematical model of continuous billet caster is developed, incorporating the mathematical model of solidification process and the control model for spraying water flowrate of secondary cooling. Solidification analyses of the strand for each cooling zone are carried out by two-dimensional finite difference method. The temperature distribution and shell thickness of the strand in solidification process are analysed, which provid the basis and input data for secondary cooling control model. This control model is developed with feedforward control strategy based on continuous temperature measurement in tundish and virtue casting speed. The control model is applied on some caster and billet quality is obviously improved, which indicate that the dynamic secondary cooling control model is better than the conventional ones.
出处
《沈阳理工大学学报》
CAS
2009年第2期62-65,70,共5页
Journal of Shenyang Ligong University
关键词
连铸
凝固传热模型
二冷
动态控制
continuous casting
solidification and heat transfer model
secondary cooling
dynamic control
