Study and Application of Bottom Blowing Technique of Combined Blowing Converter

• Published in: Journal of iron and steel research, international Vol. 21; no. 1; pp. 41 - 45
• Main Authors: YANG, Li-bin, LIU, Liu, JIAO, Xing-li, TONG, Pu-qiao
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 2014; Springer Singapore
• Subjects: Applied and Technical Physics; Blowing; Bottom blown converters; bottom nozzle; combined blowing; Engineering; Iron and steel industry; Iron and steel making; Machines; maintenance technique; Manufacturing; Materials Engineering; Materials Science; Mathematical models; Metallic Materials; Nozzles; Physical Chemistry; Processes; product of carbon and oxygen; Steel converters; Steel making; Steels; water model; 应用; 底吹; 水模型试验; 炼钢技术; 维修技术; 转炉; 送风参数; 顶底复合吹炼; water model; bottom nozzle; combined blowing; product of carbon and oxygen; maintenance technique
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(14)60007-8

The water modelling experiments of 300 t converter concerning combined blowing parameters, the number, and configuration of bottom nozzles are carried out. The results show that the arrangement of 16 bottom nozzles at 0. 40D and 0. 45D （hearth diameter） concentric circles is the reasonable solution. The combined blowing steel- making technique of 300 t converter has been developed through experiments and studies relating to optimizing the top-bottom combined blowing pattern, the number and configuration of the bottom nozzles, the type selection of bot- tom nozzle, and bottom nozzle maintenance techniques. The results show that the product of w[c] ＂ w[o] at endpoint is reduced from 0. 002 62 to 0. 002 43, average TFe content is decreased by %, phosphorus distribution is raised from 70.85 to 78.95, sulfur distribution is raised from 3.43 to 4.32 and manganese content is raised by 0.02%.