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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。
The complicated heat exchange process in the furnace easily leads to the decrease of the calculation accuracy of the mathematical model of the heating process established by the method of the total heat absorption. In order to solve this problem, a mathematical model of the billet heating process is established, and a test correction method for the total heat absorption rate is proposed. The temperature of billet in different positions in the furnace was measured by dragging test. The total heat absorption rate at different positions was calculated and compared with the model given value to determine the compensation value of the total heat absorption rate. The simulation results show that the billet temperature calculated by the revised model is very close to the experimental measurement results, and the experimental correction method can meet the requirements of online pilot-time control of billet heating process.