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针对连铸生产过程中的二冷配水问题,建立了铸坯的凝固传热数学模型。通过实时模拟计算铸坯的温度场,并与PID控制技术相结合,开发了在线二冷控制模型。模型能自动根据钢种、铸坯规格及工艺参数的变化动态调整二冷控制水量,将铸坯的表面温度控制在工艺目标值附近。通过设计合理的控制系统架构,确保了二冷控制系统的稳定性及可靠性。在线测温结果表明,模型具有很高的计算精度。当拉速、浇注钢水过热度变化时,模型能快速将水量调整到目标值,速度快且超调小,从而确保铸坯的表面温度跟踪误差始终限制在较小范围内;当浇注过程处于相对稳态时,铸坯的表面温度保持在目标值。目前,模型已经应用于宝钢内外的多台连铸机,应用效果良好。
Aiming at the problem of secondary cooling and water distribution in continuous casting process, a mathematical model of solidification and heat transfer of slab is established. Through real-time simulation of the temperature field of the slab and the combination of PID control technology, an on-line cooling control model has been developed. The model can automatically adjust the amount of secondary cooling control water according to the change of steel type, slab specification and process parameters, and control the surface temperature of the slab around the target value of the process. By designing a reasonable control system architecture, the stability and reliability of the second cooling control system are ensured. The on-line temperature measurement results show that the model has high calculation accuracy. When the speed of casting, pouring molten steel superheat changes, the model can quickly adjust the water to the target value, speed and overshoot, so as to ensure the slab surface temperature tracking error is always limited to a small range; when the pouring process in the relative Steady state, the slab surface temperature maintained at the target value. At present, the model has been applied to many continuous casting machines both inside and outside Baosteel, with good application effect.