Patent ID: 7900779
Filing Date: 2011-03-08
Classification: B01D,B07B

Abstract:
1. A particle classifier ( 2 ) for separating solid particles in a mixture of gas and particles ( 1 ) into a fine and coarse fraction depending on size by means of gravitation force, air resistance force and applied centripetal force, where a mixture of gas and particles are charged to the classifier well dispersed in an inlet zone ( 3 ) after which the mixture is brought in contact with a rotor ( 6 ) in a first separation zone ( 5 ) constituting an annular, “free rotor” chamber so that the gas and the fine particles are allowed to escape through an upper outlet ( 9 ) while the coarse fraction of the particles are discharged through a lower outlet ( 15 ), wherein vertically below the first separation zone ( wherein separation of particles in the second separation zone is facilitated by air supplied through a second inlet ( particles in the first and second separation zones are separated by centripetal force; and wherein trajectories of the coarse and fine fractions never collide.