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| Thermal Trial Analysis on Unsteady Heat Transfer for Blast Furnace Cooling Stave |
| JIAO Ke-xin1,2 , ZHANG Jian-liang1,2 , ZUO Hai-bin1,2 , SHEN Meng3 ,TIE Jin-yan3 , LI Feng-guang1,2 |
1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083,China
2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
3. Hebei Tianyu High-Tech Metallurgical Casting Co., Ltd., Cangzhou 061000, Hebei， China |
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Abstract BF campaign is of great significance for efficient, sustainable development of iron and steel enterprises. Smooth operation and the service life of the cooling stave is one of the fundamental factors affecting the life of a blast furnace, and therefore subject to focus on the stave efficient longevity research. Through design and construction of hot test furnace for cooling stave, unsteady state heat transfer of blast furnace cooling stave was studied under condition of with or without slag crust and changing rules of thermocouple temperature under different furnace temperatures were also analyzed. Changing rules of thermocouple temperature at heating stage, steady stage and cooling stage were obtained by regression method. Average heat flux intensity without slag crust was calculated and through regression method convective heat transfer coefficient was obtained. It was concluded that the changing rate of thermocouple temperature which embedded in the cooling stave under condition of with slag crust is significantly lower than without slag crust. The damage of cooling stave is mainly due to thermal stress produced by repeatedly change of temperature and frequently production and separation of slag crust, which shows the actions that are being executed and the results that are extending the cooling stave service lives.
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Received: 06 December 2013
Published: 02 December 2014
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2014, Vol. 49 
