Patent ID: 8398734

Claim:
Cyclonic separator comprising a throat portion ( 4 ) which is arranged between a converging fluid inlet section and a diverging fluid outlet section, the cyclonic separator being arranged to generate a swirling fluid flow around a central axis (I) of the cyclonic separator in a downstream direction through the converging fluid inlet section and the throat portion towards the diverging fluid outlet section, the diverging fluid outlet section comprising outlets ( 6 , 7 ) comprising an inner primary outlet ( 7 ) for condensables depleted fluid components and an outer secondary outlet for condensables enriched fluid components ( 6 ), the cyclonic separator comprising at least one volute diffuser ( 9 , 9 ′) connected to one of the outlets ( 6 , 7 ), the at least one volute diffuser ( 9 , 9 ′) comprising a volute outlet duct ( 90 , 90 ′) defined by a volute axis (I 1 ), the volute axis (I 1 ) substantially forming a spiral shape around the central axis (I), the volute outlet duct ( 90 , 90 ′) comprising a vortex chamber ( 95 ), in use the vortex chamber ( 95 ) is provided to transform axial momentum of the swirling fluid flow with respect to the central axis (I) into tangential momentum with respect to the volute axis (I 1 ), characterized in that the cross sectional area of the volute outlet duct ( 90 , 90 ′) increases from a minimal cross sectional area to a maximal cross sectional area, the maximum cross sectional area of the volute outlet duct ( 90 , 90 ′) comprises a passage to the minimal cross sectional area of the volute outlet duct ( 90 , 90 ′).