Classifier, Power Plant, And Method For Operating Classifier

Abstract: The purpose of the present invention is to improve classifying performance. A rotary classifier (16) classifies crushed solid fuel guided along with primary air into a coarse powder fuel (B1) having a particle size greater than a predetermined particle size and a fine powder fuel (B2) having a particle size equal to or less than the predetermined particle size. The rotary classifier (16) comprises a plurality of blades (60) that extend vertically, that are circumferentially positioned side by side on a virtual circle (V) centered about a vertically extending center axis (C), and that guide solid fuel along with transport gas heading from the outer side to the inner side along the radial direction. The blades (60) have collision surfaces (61) against which the guided crushed fuel collides. Said collision surfaces (61) causing coarse powder fuel (B1) of the crushed fuel that has collided therewith to be repelled radially outward, and fine powder fuel (B2) of the crushed fuel that has collided therewith to be repelled radially inward, the particles of the coarse powder fuel (B1) exceeding a predetermined size and the particles of the fine powder fuel (B2) not exceeding the predetermined particle size. In each of the collision surfaces (61), the angle formed by the tangent of the virtual circle (V) and a normal to the collision surface (61) is greater on the radially outer side than on the radially inner side.

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