A classifying device may be used to classify a granular material flow. The classifying device may comprise a first inlet that allows a first material flow into the classifying device, a second inlet that allows a second material flow into the classifying device, a static classifier, and a dynamic classifier. The static classifier may be positioned such that the static classifier at least partially surrounds the dynamic classifier. The classifying device may comprise a distributing device that is designed in such a manner that it supplies the material flow of the first inlet to the static classifier and the material flow of the second inlet to the dynamic classifier.

The present invention improves the even distribution of a powder to a pulverized coal pipe. A rotary classifier including: a rotary shaft rotatably supported around a rotational axis extending in a vertical direction; a frame body supported by the rotary shaft and including an opening on the outer periphery of the frame body; a plurality of powder outlets provided along the rotation direction and opening on the upper section of the frame body; a plurality of blades extending in the vertical direction at the opening on the outer periphery of the frame body and provided along the rotation direction; and an annular member that serves as a constricting section provided so as to narrow the interval from the blades to the rotary shaft.

The present invention improves the even distribution of a powder to a pulverized coal pipe. A rotary classifier including: a rotary shaft rotatably supported around a rotational axis extending in a vertical direction; a frame body supported by the rotary shaft and including an opening on the outer periphery of the frame body; a plurality of powder outlets provided along the rotation direction and opening on the upper section of the frame body; a plurality of blades extending in the vertical direction at the opening on the outer periphery of the frame body and provided along the rotation direction; and an annular member that serves as a constricting section provided so as to narrow the interval from the blades to the rotary shaft.

A classifying rotor has a rotatable frame body and classifying blades. The frame body has an opening portion on an outer peripheral portion and an ejection port for ejecting a fluid having flowed into an inside through the opening portion to an outside. The classifying blades are disposed at a desired interval in a circumferential direction on an outer peripheral side part in the frame body. The classifying blades are provided in the frame body so that an angle formed by a direction of the classifying blade and a rotating direction of the frame body becomes a desired inclination angle. The desired inclination angle is an angle at which classification accuracy becomes better when the classifying blades are inclined so that the formed angle becomes gradually smaller from 90 degrees.

A classifying rotor has a rotatable frame body and classifying blades. The frame body has an opening portion on an outer peripheral portion and an ejection port for ejecting a fluid having flowed into an inside through the opening portion to an outside. The classifying blades are disposed at a desired interval in a circumferential direction on an outer peripheral side part in the frame body. The classifying blades are provided in the frame body so that an angle formed by a direction of the classifying blade and a rotating direction of the frame body becomes a desired inclination angle. The desired inclination angle is an angle at which classification accuracy becomes better when the classifying blades are inclined so that the formed angle becomes gradually smaller from 90 degrees.

Provided is a vertical roller mill equipped with a rotary classifier for causing a plurality of classification blades provided above a rotary table and positioned around an axis to rotate about the axis, wherein: of a solid fuel pulverized by a roller, the rotary classifier guides solid fuel fine powder from an outer-circumferential-side space to an inner-circumferential-side space surrounded by the plurality of classification blades, and suppresses, by collision with the plurality of classification blades, an intrusion of solid fuel coarse powder into the inner-circumferential-side space; and each of the plurality of classification blades is shaped in a manner such that there is no interference between a scattering direction in which the coarse powder that collided with the classification blades scatters and an intake direction in which the fine powder is guided to the inner-circumferential-side space, and the scattering direction is oriented upward relative to a horizontal direction.

Provided is a vertical roller mill equipped with a rotary classifier for causing a plurality of classification blades provided above a rotary table and positioned around an axis to rotate about the axis, wherein: of a solid fuel pulverized by a roller, the rotary classifier guides solid fuel fine powder from an outer-circumferential-side space to an inner-circumferential-side space surrounded by the plurality of classification blades, and suppresses, by collision with the plurality of classification blades, an intrusion of solid fuel coarse powder into the inner-circumferential-side space; and each of the plurality of classification blades is shaped in a manner such that there is no interference between a scattering direction in which the coarse powder that collided with the classification blades scatters and an intake direction in which the fine powder is guided to the inner-circumferential-side space, and the scattering direction is oriented upward relative to a horizontal direction.

A centrifugal classifier including a classifier housing having at least one coarse material outlet and a classifier wheel, revolving in the classifier housing. The classifier wheel is comprised of a classifier drum and a classifier wheel shaft forming the axis of rotation of the classifier drum. A guide member is arranged near the coarse material outlet, at a set distance from the inner jacket surface of the classifier housing section surrounding the classifier drum. The guide member is configured such that classifying material flowing along the inner jacket surface at a radial distance less than or equal to the set distance circumvents the guide member and is discharged into the coarse material outlet and classifying material flowing along the inner jacket surface at a radial distance greater than the set distance is deflected in a radially inward direction toward the classifying drum.

A centrifugal classifier including a classifier housing having at least one coarse material outlet and a classifier wheel, revolving in the classifier housing. The classifier wheel is comprised of a classifier drum and a classifier wheel shaft forming the axis of rotation of the classifier drum. A guide member is arranged near the coarse material outlet, at a set distance from the inner jacket surface of the classifier housing section surrounding the classifier drum. The guide member is configured such that classifying material flowing along the inner jacket surface at a radial distance less than or equal to the set distance circumvents the guide member and is discharged into the coarse material outlet and classifying material flowing along the inner jacket surface at a radial distance greater than the set distance is deflected in a radially inward direction toward the classifying drum.

Toner classification apparatus comprising classification rotor comprising a plurality of vanes extending from rotation center side of classification rotor to outer circumference side of classification rotor; the plurality of vanes are disposed with prescribed gaps established between vanes; gaps form opening facing rotation center region of classification rotor; each of vanes is disposed such that portion of vane away from of center of rotation of classification rotor is located on more upstream side in a direction of rotation of classification rotor than portion of vane closer to center of rotation of classification rotor; each of vanes has elbow; and in a horizontal cross section provided by sectioning classification rotor in a rotational axis perpendicular direction of classification rotor, shape of vane satisfies prescribed formulae, as well as toner production method comprising classification step of carrying out classification process on particles to be classified by using toner classification apparatus.