Abstract: In order to explore the effect of insertion depth of stirring paddle on desulfurization efficiency and to reduce the sulfur content of the molten iron charged into converter , the flow field of hot metal and desulfurization efficiency with different insertion depth of stirring paddle were investigated by numerical simulation and industrial test. The results show that when the stirring paddle insertion depth and height of fluid level ratio is 0.287, the upper and lower circulation area is almost consistent. And when the insertion depth is 800 mm in the industrial test, the average final sulfur mass fraction is lower than 20×10-6. The result of numerical and that of industrial test concide with each other.

Key words: KR desulfuration, stirring paddle, industrial test, numerical simulation