机械搅拌法与镁喷吹法铁水搅拌能和混匀时间的关系

Relationship Between Stirring Power and Mixing Time of Hot Metal by Mechanical Stirring Method and Magnesium Injection Method

采用永田进治公式和全浮力模型计算了机械搅拌法和喷吹法的铁水搅拌能,研究了搅拌能和混匀时间的关系,并和水模型的结果进行了比较,分析了两种搅拌能影响混匀时间的原因。结果表明,机械搅拌法的搅拌能力比喷吹法大数倍,在同一搅拌能下机械搅拌方式的混匀时间比喷吹法短。搅拌优势使得机械搅拌法比喷吹法的脱硫率比喷吹法平均高18.61%,带来的副作用是铁水温降要高于喷吹法15℃,以及对耐火材料的侵蚀速度为喷吹法的3倍。

The stirring power of hot metal by mechanical stirring method and magnesium injection method were cal-culated with empirical formula and plume model .The relationship between mixing time and stirring power of hot metal was determined according to the calculated results and compared with that of liquid in water model .The results show that mechanical stirring method stirring power is several times of the injection method stirring power .The me-chanical stirring method mixing time is shorter than that of injection method at the same level of stirring power .The desulfurization rate of hot metal by mechanical stirring method is 18 .61% higher than that by injection method . Meanwhile ,it brings some negative effects which the temperature drop of hot metal caused by mechanical stirring method are 15 ℃ higher than that caused by injection method for strong mixing ,and the refractory erosion rate of mechanical stirring method is 3 times of that of injection method .