Cold model investigations of fluid flows and mixing within top and combined blowing in metallurgical processes

Cold model investigations were performed during top and combined blowing in metallurgical processes. The investigations include 2- and 3-phase systems with gas, water and oil phase. The results of top blowing tests can be use d to arrange and optimise the fluid flow. Further, conclusions can be drawn for the spraying and emulsification process, if the slag thickness is know n. Under combined blowing conditions a small amount of stirring gas injecte d from the bottom has a great influence on mixing. According to the slag th ickness, in combination with the power of the top blowing momentum, the flu id flow is dominated by top or bottom blowing. If bottom blowing is added a s a stirring mechanism, a better mixing can not be guaranteed by this means . The bottom blowing conditions have to be adapted to the top blowing condi tions and to the reactor geometry.