中厚板轧后冷却的过程控制

中厚板终轧后只能靠前馈模型控制钢板的冷却过程,普通的温度模型计算存在较大误差,针对这一问题,推导了中厚板控制冷却过程的差分模型·结合首钢中板厂控制冷却系统的改造,通过采用两次修正计算和自学习修正计算,从系统上保证了温度控制的精度·提出了热交换系数的计算方法·针对中厚板控制冷却特点,给出了层流冷却过程控制模型的自学习算法·通过采用自学习算法,进一步提高了模型的控制精度·控制冷却系统在首钢顺利投产,系统终冷温度控制合格率在96 5%以上·

Cooling Process Control of Rolled Plate

The cooling process of rolled plate only depend on feedforward model, but the existing precision of commonly used temperature models are not high enough for controlling properly the process. A differential equation was therefore deduced as the model to control the plate cooling process, of which the 1st and 2nd, especially the self-learning modifications were carried out for calculation in combination with the reform of the cooling control system for Shougang's Plate Mill, thus providing the precision systematically for its temperature control. A calculation using a heat transfer coefficient is presented in plate laminar cooling to adapt to the plate cooling characteristics, then a selflearning algorithm of laminar flow cooling is given, by which the model's control precision is further improved. The control cooling system has been applied to Shougang's Plate Mill and showed a 96.5% acceptability in temperature control.