基于中包钢水连续测温的拉速优化控制系统

Casting Speed Optimization Control System Based on Continuous Temperature Measurement of Molten Steel in CC Tundish

为了提高铸机的产量和质量,针对塞棒控制结晶器液位的小方坯铸机拉速手动控制现状,利用建立的拉速优化控制模型获得拉速与过热度的最佳优化关系,设计出连铸机拉速随过热度变化的前馈控制系统.以传热模型为基础,最大拉速和出结晶器坯壳厚度为限制条件,建立拉速优化模型,并与实际生产相结合,设计出拉速随过热度的阶梯控制系统.并且重点分析了控制模式切换时的可靠性问题.现场应用表明:开发的该控制系统运行稳定可靠,能够满足现场生产需要.

To improve the output and quality of products in casting, the existing manual speed control for billet caster with molten steel level in mold controlled by stopper was investigated. A feed forward control system was thus designed according to the optimal relationship between casting speed and superheat which was obtained from the casting speed optimization control model that developed on the basis of the heat transfer model and production practice, with the restriction on maximum casting speed and shell thickness at mold exit involved. Furthermore, a hierarchical control system was designed where the casting speed changes with superheat. The reliability of changeover of the control modes switched was discussed emphatically. Field application shows that the proposed control system runs robustly and reliably and satisfies the production requirements.