总括热吸收率的基本辨识

加热炉二级控制系统通常采用总括热吸收率法作为核心模型，而总括热吸收率既是结构参数的函数，也是操作参数的函数，因此其辨识较为困难.以宝钢2050热轧厂3号加热炉进行的拖偶实验为例，详细阐述了基本辨识的过程.对实验数据进行整理，并采用表面温度梯度法反演CF.推导了CF基本辨识体系的完整表达式，同时对辨识结果进行必要的分析.反演过程中发现，当采样点较多时，反演的钢坯表面热流呈振荡趋势，这是采样周期与测量系统的分辨率不匹配所导致的.由基本辨识的sCF曲线可知，当钢坯静止时，在同一位置处CF值是变化的，这证实了CF动态补偿的必要性.

Basic Identification for the Total Heat Exchange Factor

The total heat exchange factor method is used as core model for L2 control system of reheating furnace. Total heat exchange factor is not only a function of structure parameters， but also a function of operating parameters， thus the identification for it is hard. Based on the drag thermocouple experiment of No3 reheating furnace in 2050 hot rolling mill in BaoSteel， basic identification was researched. The experiment data were arranged. Meanwhile， CF was identified by surface temperature gradient method. Finally， complete expression of the identification system was derived， and the result of basic recognition was analyzed. In the process of identification with a large number of sampling points， the surface heat flux curves appeared oscillating. It was caused by the mismatching between sampling period and system resolution. The CF curves show that the values of CF at the same site are different when the slab is still. So the compensation for CF is necessary.