Abstract: A 2D solidification and heat transfer model for the secondary cooling process of beam blank continuous casting was established based on the solidification and heat transfer theory. The 2D space region of the beam blank section was discretized by using the nonequidistant grid, and the heat transfer equations was discretized based on the algorithm of explicit finite difference. The PID control model was established to control beam blank temperature. A dynamic distribution of water control software was developed for secondary cooling process in beam blank continuous casting with Visual Basic 6.0.When the casting speed, pouring temperature and casting steel grade changed, this software might track, record and display the informations of the beam blank in secondary cooling section and dynamically distribute water flow rate for different sections of secondary cooling to maintain the stability of the temperature distribution of the casting blank. This software is of very userfriendly, versatile and the simulation results prove that the control effects are desirable. This software lays the foundations for the development of dynamic secondary cooling control system for beam blank.

Key words: beam blank, secondary cooling, finite difference method(FDM), dynamic distribution of water, PID control technology

摘要： 针对异型坯连铸二次冷却过程，基于凝固传热理论建立其二维凝固传热模型，采用非等间距网格离散空间区域，采用显式有限差分算法离散传热方程。以铸坯温度为控制目标建立了PID反馈控制模型。应用Visual Basic 6.0程序设计语言，开发了连铸二冷区离线动态配水控制软件，在铸坯拉速、浇铸温度和钢种发生变化后，该配水控制软件能够对进入二冷区的铸坯信息实行全程跟踪、记录、显示并动态地分配二冷各区的水量，保持铸坯温度分布的稳定。该软件界面友好、通用性强，运行结果证明其控制效果良好,从而为异型坯二冷水量实时动态控制系统的开发奠定了基础。

关键词: 异形坯, 二次冷却, 有限差分法, 动态配水, PID控制技术