薄规格带钢层流冷却过程在线温度模型

On-line temperature model of thin gauge strip during laminar cooling

薄规格带钢轧后的层流冷却过程运行速度高、温降快,为了满足冷却过程实时性的要求,在线温度模型要有较高的计算效率。文章基于有限差分法建立显式格式和隐式格式的差分温度模型,分析了不同差分格式以及网格划分方法对模型计算效率的影响,提出了一种具有快速响应特性的在线温度控制模型。在保证计算精度不变的条件下,采用隐式差分格式进行较大的时间步长划分。使用自然对数的网格划分方法,有利于提高温度模型的计算效率,实现在线控制的快速响应。

The laminar cooling process of thin gauge strips after rolling had the characteristics of high motion velocity and rapid temperature drop.The online temperature model needs high computational efficiency to realize the real-time requirement of cooling process.The finite difference method was used to establish explicit and implicit temperature models.In addition,the effects of different difference schemes and meshing methods on the calculation efficiency of the models were analyzed,and an online temperature control model with fast response characteristics was proposed.Under the condition of keeping the calculation accuracy unchanged,the implicit difference scheme with large time step and the natural logarithmic grid generation method can improve the calculation efficiency of the temperature model,which was beneficial to the quick response of online control.