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| Flow and heat transfer characteristics and erosion monitoring model in hearth |
| WU Di1, JIN Feng1, LIU Yong1, BI Chuan-guang2 |
1. School of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016, Jiangsu, China;
2. Shanghai Meishan Iron and Steel Co., Ltd., Baoshan Iron and Steel Group, Nanjing 210016, Jiangsu, China |
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Abstract To analyze the flow and heat transfer characteristics in the hearth of the blast furnace under actual working conditions and predict the erosion line in the carbon bricks, computational fluid dynamics(CFD) and two-dimensional fast backstepping calculation methods are used to simulate the furnace bottom. The research results show that the full-scale furnace bottom CFD simulation better shows the temperature field and flow field characteristics of the furnace bottom fluid-solid zone, and the measured point temperature and the historical thermocouple temperature value are less than 5.2%; when there is an air gap in the furnace body, the air gap The extreme hot zone and the extreme cold zone are formed on the left and right, which is consistent with the phenomenon of the sudden temperature change of the thermocouple in the historical data. When the thickness of the air gap is 10, 20 and 30 mm, the temperature difference between the left and right of the air gap is 14.7, 18.9, 21.4 times respectively compared with no air gap; the two-dimensional fast reverse calculation deduced the shape of "elephant-foot" erosion, the maximum erosion position is within 1-3 m below the taphole, and the minimum residual thickness has an error of 13.5% from the actual measured value, it is also consistent with the actual erosion of the blast furnace.
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Received: 18 August 2020
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2021, Vol. 56 
