A series of improvements in prolonging the AOD refractory lining life in Baosteel are introduced and analyzed in this paper,including modification of the AOD shell shape, adjustment of the top slag components and sele...A series of improvements in prolonging the AOD refractory lining life in Baosteel are introduced and analyzed in this paper,including modification of the AOD shell shape, adjustment of the top slag components and selection of the side-blowing tuyeres. Firstly,the layout of side-blow tuyeres was altered with the angle between each two tuyeres being 22.5° instead of the original 18° ,and the connection of the outside steel shell in the side-blow area was modified from the former platform shape with great stress concentration into a new smooth circle shape. Secondly,the slag components were changed from the former CaO-FeO-SiO： system to the CaO-MgO-SiO2 system. Besides, the basicity of the top slag was kept higher than 1.8 ,and the MgO content in the slag was kept within the range of 8% - 12%. Finally,tuyeres with an inner diameter 13% smaller than that of the original tuyeres were used. Based on these research and optimization work,the thermodynamics and kinetics in the AOD refining bath has been improved markedly, and the campaign of the AOD has been prolonged from 45 heats at the beginning of its start-up to the current 185 heats. Meanwhile,the yield of chromium alloy and the decarburization efficiency have also been improved.展开更多
对不锈钢AOD转炉精炼过程数学模拟作了初步研究,注意到该侧顶复吹精炼过程的物理和化学特性,考虑体系的质量和热量衡算,以及添加渣料、废钢、合金料等操作、精炼过程的不等温状态、钢液和熔渣质量的变化等因素的影响,提出了一个针对整...对不锈钢AOD转炉精炼过程数学模拟作了初步研究,注意到该侧顶复吹精炼过程的物理和化学特性,考虑体系的质量和热量衡算,以及添加渣料、废钢、合金料等操作、精炼过程的不等温状态、钢液和熔渣质量的变化等因素的影响,提出了一个针对整个精炼过程的数学模型。基于设计的操作模式,以该模型对120 t AOD转炉内奥氏体不锈钢的整个精炼过程,包括氧化(脱碳)和还原过程作了模拟和估算,与工艺设计给出的参照数据作了比较。展开更多
文摘A series of improvements in prolonging the AOD refractory lining life in Baosteel are introduced and analyzed in this paper,including modification of the AOD shell shape, adjustment of the top slag components and selection of the side-blowing tuyeres. Firstly,the layout of side-blow tuyeres was altered with the angle between each two tuyeres being 22.5° instead of the original 18° ,and the connection of the outside steel shell in the side-blow area was modified from the former platform shape with great stress concentration into a new smooth circle shape. Secondly,the slag components were changed from the former CaO-FeO-SiO： system to the CaO-MgO-SiO2 system. Besides, the basicity of the top slag was kept higher than 1.8 ,and the MgO content in the slag was kept within the range of 8% - 12%. Finally,tuyeres with an inner diameter 13% smaller than that of the original tuyeres were used. Based on these research and optimization work,the thermodynamics and kinetics in the AOD refining bath has been improved markedly, and the campaign of the AOD has been prolonged from 45 heats at the beginning of its start-up to the current 185 heats. Meanwhile,the yield of chromium alloy and the decarburization efficiency have also been improved.
文摘对不锈钢AOD转炉精炼过程数学模拟作了初步研究,注意到该侧顶复吹精炼过程的物理和化学特性,考虑体系的质量和热量衡算,以及添加渣料、废钢、合金料等操作、精炼过程的不等温状态、钢液和熔渣质量的变化等因素的影响,提出了一个针对整个精炼过程的数学模型。基于设计的操作模式,以该模型对120 t AOD转炉内奥氏体不锈钢的整个精炼过程,包括氧化(脱碳)和还原过程作了模拟和估算,与工艺设计给出的参照数据作了比较。
