Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Heavy Industries Limited

Hidechika Uchida

Shinji Matsumoto

Takuichiro Daimaru

Kenichi Arima

Kazushi Fukui

Norichika Kai

Taku Miyazaki

Hideyuki Hamaya

Daisuke Ishimoto

A classifier including a housing to take in air flow from below into a radially outer region of an inside space; a flow deflection portion to deflect the air flow toward a center axis of the housing; and an annular rotational portion disposed rotatably in a radially inner region positioned on a radially inner side of the radially outer region, of the inside space of the housing, and configured to classify particles which accompany the air flow. The annular rotational portion includes a plurality of rotational blades arranged at intervals around a rotational axis of the annular rotational portion. The plurality of rotational blades form an outer shape of the annular rotational portion forms an angle &#x3b8; of not greater than 75&#xb0; with a segment extended in a horizontal direction from the annular rotational portion outward in a radial direction, in a side view of the annular rotational portion.

Classifier, pulverizing and classifying device, and pulverized coal burning boiler

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.

Vertical roller mill

A mill roller () is provided with a roller main body () that rotates about an inclined axis line (O) and has an outer peripheral surface () for pulverizing an object to be crushed against the mill table (). The outer peripheral surface () is convex outward in a radial direction of the roller main body (). The outer peripheral surface () has a first outer peripheral surface () and a second outer peripheral surface (). The first outer peripheral surface () has an arcuate shape formed to have the same radius of curvature on both sides of a maximum outer diameter point (A). The second outer peripheral surface () is further receded inward in the radial direction than an imaginary circle running along the first outer peripheral surface ().

Mill roller and pulverizer

Growing community of inventors

Yokohama, Japan

Hidechika Uchida