Abstract: Aimed at the problem that there is no way for an ordinary cyclone to separate solid-phase particles with particle size about ten microns, a new structure of cyclone was presented for combined filtration separation with cyclone separation, the numerical simulation of the variation of velocity and pressure fields in the internal fluid and the stability of the air column there was carried out, and the filtration flux and separation efficiency of the filtering media were studied experimentally. It was found that the new integral filtering hydro-cyclone would have a more stable internal flow field, the internal velocity and pressure drop would be greater under condition of identical operation parameters and structure parameters. When the particle size was more than 5 μm, the separation efficiency of the hydrocyclone would be improved rapidly. The separation efficiency of solid particles of about 10 μm in diameter could reach 65% to 85% and the average separation efficiency of ordinary cyclone used in experiment would be below 60%.

Key words: filtering with hydrocyclone, fine particle separation, porous medium