钢坯加热过程数学模型的试验修正研究

Experimental Correction of Mathematical Model for Steel Heating Process

复杂的炉内热交换过程容易导致根据总括热吸收率法建立的加热过程数学模型的计算精度降低。为解决该问题,在建立钢坯加热过程数学模型的基础上,提出了总括热吸收率的试验修正方法。采用拖偶试验测得了钢坯在炉内不同位置的温度,计算出不同位置处的总括热吸收率,并将其与模型给定值相比较,从而确定总括热吸收率的补偿值。仿真结果表明,修正模型计算所得钢坯温度与试验测量结果非常接近,该试验修正方法可以满足钢坯加热过程在线试时控制的精度要求。

Computational accuracy of heating process mathematical model based on total heat exchange factor（THEF） method was found easy to decrease due to complex heat exchange process in a furnace.To solve this problem,an experimental correction method of dynamic compensation of THEF was therefore proposed on the basis of establishing steel heating process mathematical model.Temperatures of steel at different positions were measured by dragging coupling method.Then the corresponding THEFs can be achieved,and they were compared with those from model computation to determine the compensation values of THEF.Simulation results show that steel temperatures from the proposed model approaches experimental data and the experimental correction method meets the requirement of accuracy for online and real-time control in steel heating process.