Influence of bottom blowing gas parameters on erosion rate of tuyere bricks
GAO Fei1,2, YANG Wen-yuan3, PENG Xiao-yan1,2, LI Lin1,2, WANG Ming-lin4, ZHANG Yan-xiang1,2
1. Beijing Key Laboratory of Advanced Ceramic and Refractories, Beijing 100081, China; 2. New Products Department, CISRI Engineering Design Co., Ltd., Beijing 100081, China; 3. Metallurgical Technology Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China; 4. Zhongda NationalEngineering and Research Center of Continuous Casting Technology Co., Ltd., Beijing 100081, China
Abstract：In order to investigate the influence of bottom blowing gas injection parameters (such as pressure, flow rate, nozzle hole diameter, etc.) on the erosion rate of tuyere bricks, the dissolution rate of table salt, borax, sodium carbonate, and the mixture of table salt and sodium carbonate in different proportions in water were compared, and then natural salt bricks were selected to simulate the material of tuyere bricks for erosion water simulation tests. The water was used to simulate the liquid steel, compressed air was injected in the 1∶10 plexiglass model, the injection parameters (pressure, flow, injection time)were changed, and the changes in the size of nozzle holes for tuyerebricks were measure before and after the injection, and then the erosion of tuyere bricks (radial erosion rate, axial erosion rate and erosion angle) was calculated.At last, the relationship between gas injection parameters and erosion rate of tuyere bricks were build. According to size of nozzle hole, parameters of injected gas and the dimensionless number of injection conditions (modified Froude number, Reynolds number and apparent Mach number, etc.), the flow condition of gas injected into molten pool was analyzed, such as equivalent volume and equivalent diameter of bubble in the gas flow, height of air column formed during the blowing process, transition of bubble flow and jet flow, etc. The research results show that the axial erosion and radial erosion velocities of tuyere bricks increase with the increase of bottom blowing air flow rate, and the erosion angle is little affected by the nozzle hole diameter and gas flow rate, which can improve the stirring effect of bottom blowing gas on the molten pool. These results have reference significance for the improvement of combined blowing technology.
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GAO Fei, YANG Wen-yuan, PENG Xiao-yan, LI Lin, WANG Ming-lin, ZHANG Yan-xiang. Influence of bottom blowing gas parameters on erosion rate of tuyere bricks[J]. China Metallurgy, 2022, 32(7): 27-34.
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2022, Vol. 32 
