Numerical simulation on dispersion behavior of graphite particle in molten slag
In order to improve the uniform dispersion of reducing agent graphite particles in molten basic oxygen furnace slag,based on the computational fluid dynamic-discrete particle model(CFD-DPM),the numerical simulation method has been employed to simulate the multiphase system composed of molten slag,graphite particle and argon gas,and the motion and dispersion characteristics of graphite particles in a bottom-blown converter have been mainly investigated.Meanwhile,a particle dispersion index has been proposed to quantitatively evaluate the distribution uniformity of graphite particles in the molten slag.In addition,the effects of initial particle diameter and bottom-blown tuyere number on the dispersion characteristics of graphite particles have been discussed.The results show that large-sized graphite particles are mainly concentrated in the inactive flow zone.And the motion trajectory of graphite particles can be divided into two types.The converter with an initial diameter of 5 mm and the converter with 6 bottom-blown tuyeres are more conducive to the homo-dispersion of graphite particles.
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