Classifier, vertical crusher having the classifier, and coal...

Details Classifier, vertical crusher having the classifier, and coal... Classifier, vertical crusher having the classifier, and coal...

B - Operations, Transporting

07

B

B07B 7/083 (2006.01) F23K 1/00 (2006.01)

Patent

CA 2564286

A classifier capable of stably providing particles by further reducing the mixing ratio of coarse particles, a vertical crusher having the classifier, and a coal fired boiler apparatus having the vertical crusher. The classifier comprises a rotating fin (21) classifying solid particles by a centrifugal force, a cylindrical downward flow forming member (13) installed on the outer peripheral side of the rotating fin (21), a recovery cone (11) disposed under the rotating fin (21) and the downward flow forming member (13), and a housing (41). A contraction flow area (16) is formed between the housing (41) and the recovery cone (11), and a two-phase flow (52) formed of the mixture of the solid particles and gases blown up through the contraction flow area (16) is collided with the downward flow forming member (13) on the upper side of the housing (41) to form it in a downward flow. Then, that flow is led to the rotating fin side, classified into the fine particles and the coarse particles, and the fine particles are carried together with an airstream, passed through the rotating fin (21), and removed. A circulating swirl flow development suppressing part (30) is installed at the upper part of the contraction flow area (16) and on the outer periphery of the downward flow forming member (13).

Classificateur pouvant fournir de manière stable des particules en renforçant la réduction du rapport de mélange des particules grossières, broyeur doté du classificateur et appareil de chaudière à charbon doté du broyeur vertical. Le classificateur comporte une ailette rotative (21) qui classe les particules solides par force centrifuge, un organe créant un courant cylindrique descendant (13) installé sur le côté périphérique externe de l'ailette rotative (21), un cône de récupération (11) disposé sous l'ailette rotative (21) et l'organe créant le courant descendant (13), et un logement (41). Une zone de courant de contraction (16) est formée entre le logement (41) et le cône de récupération (11), et un courant biphasé (52) formé du mélange des particules solides et des gaz soufflés vers le haut au travers de la zone de courant de contraction (16) est mis en collision avec l'organe créant le courant descendant (13) sur le côté supérieur du logement (41) pour le créer dans un courant descendant. Ce courant est alors conduit vers le côté ailette rotative, il est classé en particules fines et particules grossières, à l'issue de quoi les particules fines sont emportées dans un courant d'air, passées par l'ailette rotative (21) et éliminées. Une partie empêchant le développement d'un courant tourbillonnant circulant (30) est installée au niveau de la partie supérieure de la zone de courant de contraction (16) et sur la périphérie externe de l'organe créant le courant descendant (13).

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