环形炉温度场模拟及分析

Numerical simulation and analysis of temperature field for annular furnace

为了进一步优化取向硅钢高温退火工艺,对取向硅钢环形炉内的传热规律进行了模拟分析。结合环形炉的工作原理和高温退火的工艺特点,对模拟区域和模拟时间进行了适当简化,建立了取向硅钢高温退火的温度模型。分析讨论了烧嘴在不同工况下,钢卷内罩的温度分布特点。结果表明,烧嘴不工作时,烟气温度沿流动方向下降较快。以大功率工作时,可显著提升炉温,同时在炉膛中央产生一个高温区,其温度可高出炉膛平均温度100℃以上。炉内辐射和对流传热的效率极高,内罩温差在30℃以内,其温度出现较大波动的区域无法直接影响钢卷,因此,可以认为内罩均热情况良好。模拟温度与实测温度之间的平均误差约为15℃,7 h后进一步缩小至10℃以下。

In order to improve the high temperature annealing process of oriented silicon steel,the heat transfer process in the annular furnace was studied by a simulation analysis approach. Through the analysis about the furnace structure and the working conditions,the model was simplified appropriately. The numerical model of the temperature field of the oriented silicon steel in high temperature annealing process was built. The temperature feature of stainless cover was concluded for different nozzle working conditions. The result of the calculation showed that when the burners were out of work,the temperature of the flue gas declined quickly along the flow direction. Moreover,when the burners were working with high power,the furnace temperature raised obviously. The high temperature region appeared in the center of the furnace whose temperature could be higher than the average value above 100 ℃. The heat transfer efficiency of radiation and convection in the furnace was high,and the maximum difference of the cover was within 30 ℃. The area of cover with unstable temperature cannot influence the coil directly. Thus,it can be considered that the temperature of the cover was well-distributed. The average error between the simulation temperature and the measurement temperature was about15 ℃,and it declined to less than 10 ℃ after 7 h annealing process.