The Heat Transfer Model of Oriented Silicon Steel Coil in Annular Furnace during the Heating Stage of High‐Temperature Annealing,Steel Research International

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The Heat Transfer Model of Oriented Silicon Steel Coil in Annular Furnace during the Heating Stage of High‐Temperature Annealing
Steel Research International ( IF 1.9 ) Pub Date : 2020-09-01 , DOI: 10.1002/srin.202000290
Tian Xia _{1,

2,

3} , Zhu He _{2,

3} , Zhonghan Luo ₄

Affiliation

A 2D numerical model is built to simulate the heat transfer across the oriented silicon steel coil in annular furnace during the heating stage of high‐temperature annealing. A new method is proposed to calculate the view factors in the radiation submodel. The numerical result is verified through the comparison with the results of in situ experiments. For a coil with 1710 mm outside and 510 mm inside diameters, the heat absorbed by the outer surface of the coil is the highest, but the heat flux density along the axial direction of the coil is larger than the radial direction. The heat flux density of the outer surface shows an 86% rise depending on the increase in radial thermal conductivity after 75% H₂ and 25% N₂ is applied as the protective atmosphere at a heating time of 37 h. The temperature difference inside the coil ranges from 143 to 476 °C till the furnace reaches its designate temperature at 58 h, but the heating rate is nearly the same across the coil above 700 °C. The difference of property inside the coil is probably related to the difference of heating rate during the first soaking.

中文翻译：

高温退火加热阶段环形炉中取向硅钢卷的传热模型

建立了一个二维数值模型，以模拟在高温退火加热阶段环形炉中定向硅钢卷之间的传热。提出了一种计算辐射子模型中视点因子的新方法。通过与原位实验结果的比较验证了数值结果。对于外径为1710 mm，内径为510 mm的线圈，线圈外表面吸收的热量最高，但沿线圈轴向的热通量密度大于径向方向。在75％H ₂和25％N ₂之后，取决于径向热导率的增加，外表面的热通量密度显示出86％的增长在37 h的加热时间内施加保护气氛。盘管内部的温度差在143至476°C范围内，直到炉子在58 h达到其指定温度为止，但在700°C以上时，整个盘管的加热速率几乎相同。线圈内部的特性差异可能与第一次均热期间的加热速率差异有关。

更新日期：2020-09-01

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