The research on the relationship between gas movement behaviors and circulation flow of the molten steel in RH

Abstract

Circulating kinetic energy has important influences on process of rapid decarburization rate in RH. A physical model of 300 t RH in 1:6 ratio is established to study the relationship between gas behaviors and circulating kinetic energy in this paper. The studies showed that the circulating kinetic energy of liquid steel has the exponential relationship with the bubble velocity and gas volume fraction (17–26%). However, the proportion that the circulating kinetic energy accounted for the total energy is less than 1%, when the void fraction in the up leg is lower than 22% or the bubble velocity less than 0.5 m/s. Therefore, in order to avoid appearing lowest energy value and take advantage of gas-driven energy, must satisfy threes below requests. Ensuring the void fraction is greater than 22%. The vacuum chamber bubble residence time is around 0.15 s. And the bubble rising velocity is not less than 0.5 m/s. Satisfying the above conditions can optimize flow effect of molten steel and improve the decarbonization rate.