Analysis of Plunging Pool Formation and Gas Absorption Phenomenon during Tapping

抄録

Gas absorption phenomenon during tapping from converter to ladle was studied by water model experiments in water-air system. Changes of dissolved oxygen, DO in the vessels were observed by DO meter and volumetric coefficient for gas absorption rate, Ak_O was estimated. In addition, the amount of gas engulfment at plunging pool with the same water model was also observed and calculated with CFD method. Observed and Experimental results were in good agreement with each other when the criterion for liquid ratio was set as 0.5. Surface area of bubbles at plunging pool calculated by CFD was used to estimate mass transfer coefficient, k_B. k_B in tapping and bottom bubbling experiments were discussed and linear relation between k_B and stirring power density was found. The Plunging pool was divided into 9 parts and velocity at bubble surface and area of bubbles in each part were calculated. It was found that the center and middle part of plunging pool was the main gas absorption region through this discussion. Bubble generation phenomenon at plunging pool in steel-air system was also calculated with the same mesh as water-air system and calculated results were compared with each other.