冷轧连续退火炉工艺过渡数学模型研究

Study on a Mathematical Model for Process Changes of Cold Rolling Continuous Annealing Furnace

由于连续退火炉带钢工艺过渡频繁,而且带钢目标带温相差太大,利用现有模型无法控制,故提出了建立冷轧连续退火炉加热炉工艺过渡数学模型。工艺过渡模型主要包括带钢目标温度模型、静态模型、动态模型、动态自适应。目标温度模型计算工艺过渡某时刻的带钢目标温度;静态模型描述炉子温度和带钢温度的关系;动态模型描述板温偏差与煤气流量、干扰间的关系;动态自适应包括静态模型自适应和动态模型的自适应,利用递推最小二乘法来自学习模型系数,使实际带温响应快、稳定。从应用实例,分析了工艺过渡数学模型的使用效果。

As changes of the cold rolling continuous annealing furnace process are very often and the difference between the target temperature of current strip and the next one is great, the normal strip temperature control model will not work. So a strip temperature change control mathematical model for the heating chamber is suggested. This model mainly includes the target temperature model, static model, dynamic model and dynamic self-adaptation. The target temperature model can calculate the target strip temperature at a certain period of time when the process shifts to the next one. The static model can describe the relationship between the furnace temperature and strip temperature. The dynamic model can describe the relationship of the deviation of strip temperature, gas flow and disturbance. The dynamic self-adaptation involves static and dynamic models＇ self-adaptation. A recursive least square method is used to get adaptive coefficients, which can make the actual strip temperature respond fast and smoothly. The model＇ s effect has been analyzed on the basis of its applications.