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| Numerical simulation of vapour diffusion in annular furnace during high temperature annealing |
| XIA Tian 1，XIANG Zhi-dong1，HE Zhu1，HU Shou-tian2，LUO Zhong-han2 |
（1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education， Wuhan University of Science and Technology， Wuhan 430081， Hubei， China
2. National Engineering Research Centre for Silicon Steel，Wuhan 430083， Hubei， China） |
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Abstract Since the atmospheric moisture content has a significant influence on the quality control of the oriented silicon steel during the high temperature annealing process，the variation law of the moisture content in the gas entrapped in the gaps between the coil layers in the annular furnace was studied. Relationship between the heating rate and the deposition rate of Mg（OH）2 in the coating of strip was analyzed，and the uniform distribution law of the vapour in the cover during the annealing process was proved by experiments. The model of the vapour diffusion in the annular furnace was built. The results showed that the deposition rate of Mg（OH）2 differed at different parts of the coil because of the different heating rates，and it cost about 28 h to drain the water in the coil completely. The water content of the protective atmosphere and the width of gaps between coil layers have a significant impact on the drainage rate，and the difference of the average water content is more than 20% in some specific conditions. The vapour is entrapped at the bottom of coil due to the insufficient distance between coil and the plate. Furthermore，the application of the hollowed out plate can reduce the average water content between the coil layers significantly.
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Received: 27 April 2018
Published: 24 December 2018
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2018, Vol. 53 
