| 摘要 |
PROBLEM TO BE SOLVED: To provide a classifier which can stably yield particulates at lower mixing ratio of rough particles. SOLUTION: The classifier is provided with a rotary fin 21 for performing classification of solid particles by centrifugal force, a cylindrical descending flow formation member 13 provided on an outer peripheral side of the rotary fin 21, a recovery cone 11 arranged below the rotary fin 21 and the descending flow formation member 13, and a housing 41. In the classifier, a contraction flow area 16 is formed between the housing 41 and the recovery cone 11, two-phase flow 52 comprising a mixture of the solid particles passing through a contraction flow area 16 and blown up and a gas is made to collide against the descending flow formation member 13 at an upper part of the housing 41 to be made to a descending flow, thereafter it is led to the rotary fin side to be divided to particulates and rough particles and the particulates are accompanied by a gas flow, passes through the rotary fin 21 and is taken out. A circulation swirl flow development suppression part 30 is provided above the contraction flow area 16 and at an outer peripheral position of the descending flow formation member 13. COPYRIGHT: (C)2006,JPO&NCIPI
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