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| Recommendations on Reasonable Operation of BF Copper Stave |
| WU Tong，CHENG Shu-sen |
| School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract A decade more from copper stave introduced form abroad to now, it has been widely used on bosh, belly as well as under shaft of blast furnace larger than 1000m3 in China. Because of short time use, phenomena of naked or scaffolding on copper stave hot face happened occasionally which had serious influence on production. Enterprises urgently need to know what operational factors restricted the accretion’s remove on copper stave. Some steel companies adjusted cooling water flow rate and temperature, which had little work frequently, to realize forming-accretion thickness and stability control. The heat transfer mathematic model of furnace wall shows as follows: the forming-accretion thickness change little which indicates that adjusting water speed and temperature in certain range has little effect on forming-accretion thickness; the leading influencing factors are peripheral gas flow temperature and cooling stave heat flux;according to effect of peripheral gas flow on forming-accretion thickness of copper stave, peripheral gas flow temperature is divided into rapid change area, gradual change area, slowly change area and the subtle change area. Blast furnace production practice in Ansteel, Tangsteel as well as Wusteel confirmed the correctness of the results above. Researching results clear up some vague realization of affecting forming-accretion thickness, which has important instruction meaning to copper stave blast furnace production. Forming-accretion morning system developed on the basis of heat transfer mathematic model of furnace wall, which has tested by actual measurement, has been applied to a blast furnace in certain civil steel company, and heat load control standard of 35-58kW/m2 has been suggested for copper stave operation.
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Received: 21 December 2010
Published: 01 November 2011
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2011, Vol. 46 
