【摘要】 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.更多还原

【Abstract】 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 w as researched. The experiment data w ere arranged. Meanw hile,CFw as identified by surface temperature gradient method. Finally,complete expression of the identification system w as derived,and the result of basic recognition w as analyzed. In the process of identification w ith a large number of sampling points,the surface heat flux curves appeared oscillating. It w as caused by the mismatching betw een sampling period and system resolution. The CFcurves show that the values of CFat the same site are different w hen the slab is still. So the compensation for CFis necessary.更多还原