Classification performance analysis of a novel cyclone with a slit on the conical part by CFD simulation

This paper proposes a novel slit-cone cyclone design and presents the subsequent evaluation of the effects of different slit locations on gas flow fields and particle separation efficiencies using experimentation and computational fluid dynamics (CFD) simulation. The slit increased the radial motion of the gas flow and improved the ability of the jacket to capture finer submicron particles with a size less than 1 μm. Because some gas escaped from the cyclone through the slit, the shearing between the core upward and annulus downward streams decreased, and the gas bypassing to the vortex finder also decreased. Because of these two mechanisms, cyclone designs that included a cone slit demonstrated enhanced partial separation efficiencies, primarily attributable to submicron particle capture. The overall separation efficiency increased from 74.5% for a conventional cyclone to 80.7% for a cyclone with a lower cone slit. In addition, the cut size decreased from 1.35 μm in a conventional cyclone to 0.83 μm in a cyclone with a lower cone slit.