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Numerical Simulation on the Influence of Floating Height for Deadman upon Erosion at Hearth Bottom in Blast Furnace during Tapping Process
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Making the campaigns of blast furnaces grow longer is the final targets for all steel companies in the world. Owing to scour and erosion from hot metal, the campaigns life of blast furnace is decided by the erosive situations in the hearth. In order to reduce protective cost and promote the competitive ability, we must understand the relationship between hot metal and hearth erosion. And the floating height for deadman affects the hearth erosion. Thus, this research is an analysis of relationship between the floating height for deadman and erosion at hearth bottom by numerical simulation during tapping process.
Based on BF2 of Chinese Steel Co., the three dimensional laminar equation for momentum, transfer equations for energy and mass were solved by computational fluid dynamics. The computational domain included the refractories, deadman and hot metal. The Ergun equation and source of mass were applied to estimate momentum loss and carbon dissolution from deadman respectively. In addition, changing the floating height for deadman and operating conditions were the way to analyze the velocity, temperature and concentration in the hearth. According to the results, the conclusions are listed in the followings:
(1) When the floating height for deadman is higher, the velocity, shear stress and carbon dissolution flux is slower at hearth bottom. The isotherm of 1150˚C is inner. The shear stress still decreases, but the carbon dissolution flux rises because of more concentration difference when the floating height is higher than a level. This level is named extreme-floating-height.
(2) An increase in production rate produces increases in velocity, shear stress and carbon dissolution flux at hearth bottom. The isotherm of 1150˚C is more outer. The extreme-floating-height becomes lower.
(3) Increasing the inlet-concentration is useful to diminish the carbon dissolution flux at hearth bottom and the extreme-floating-height becomes higher.
(4) An increase in inlet-temperature provokes a decrease in shear stress and an increase in carbon dissolution flux at hearth bottom. The isotherm of 1150˚C is outer. The extreme-floating-height is the same.
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