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Influence of bottom blowing gas supply mode on bath stirring in converter

In order to research the stirring effect on bottom blowing gas supply mode in combined blowing converter, the effect of bottom blowing flow rate distribution, switching frequency and grouping mode on mass transfer between slag- metal interface and mixing time was investigated. The study indicates that both mass transfer coefficient and mixing time change with the bottom blowing flow rate distribution, switching and grouping mode. Under continuous mode with distribution ratio as 4, the mass transfer effect reaches best; when set distribution ratio as 5,mixing time reaches smallest.Under spaced mode with distribution ratio as 3, the mass transfer effect reaches best; when set distribution ratio as 5, mixing time reaches smallest. Mass transfer coefficient decreases with increases of switching frequency. Distribution ratio has greater effect on mass transfer coefficient under continuous mode than spaced mode. Both modes are almost identical on mixing effect. In continuous mode, bottom blowing leads to uneven erosion, large flow side accelerates the lining erosion and two- phase emulsion process, while the small flow side is opposite.