  The separation efficiency and pressure drop of the dynamic separator of
cement particles can be affected by many factors, like structural type,
geometric parameters, and operating characteristics. In this paper, CFD
modeling is applied to investigate the fluid flow behavior and the efficiency
of the industrial dynamic separator with different heights of the inner cone
called the vortex breaker. Simulations are based on the RSM and the DPM models.
A CFD comparison of the original design and new designs has been performed. The
simulation results showed that the fluid flow inside the industrial air
separator is greatly dependent on the height of the vortex breaker. Interesting
phenomena were observed by the numerical simulations and the results revealed
that an increase in the height of the vortex breaker up to three-quarters of
the magnitude of the fine powder outlet duct can improve the performances of
particle separation not only by reducing 29% the cut size, and by 40% the
bypassing of fine particles but also by increasing 30% the separation sharpness
while keeping the pressure drop substantially unchanged.
