Abstract: Diversion cones were installed at the bottom of the exhaust pipe in the cyclone tube with guide vane to investigate the effect of crack area, bottom area and crack type of the diversion cone on the separation performance. A diversion cone with straight and tilted combined cracks was proposed. Tests using diversion cone with combined cracks were carried out and the results showed that when the inlet volume flow rate was 1 930 m3/h, the average separation efficiency reached 91.60% and the pressure drop was only 8.25 kPa, which indicated that installing diversion cone with combined cracks was helpful for solving the high pressure drop in cyclone tubes and it was promising in engineering practice.

Key words: diversion cone, separation performance, cyclone tube, structure, decreasing, resistance