Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Masahiko Taniguchi

Shinji Matsumoto

Tsugio Yamamoto

Kazuhiro Takeuchi

Koutaro Fujimura

Takanori Tsutsumi

Yasuhiro Sueoka

Shigehide Komada

Isao Moriyama

There is provided a control device of a coal pulverizer which enables estimation of a coal output with a precision suited for a purpose. In a control device of a coal pulverizer which pulverizes coal by the coal pulverizer and estimates coal output by which the pulverized coal is output to a boiler, the control device includes a main operation circuit which calculates a command signal associated with a coal feed rate on the basis of detection data from a boiler or a power generator connected to the boiler, and an additional control unit which calculates the deviation between a standard coal output pattern preset in the coal pulverizer, and a current coal output pattern, and adds a calculation result by the additional control unit to the main operation circuit as a correction signal.

Control device of coal pulverizer

A roller mill structure which achieves uniform distribution of fine particles passed through a rotary classifier to fine particle exits disposed at four points when conveying as pulverized coal milled in the roller mill on the air current is provided. A roller mill structure is configured to discharge pulverized coal obtained by milling a raw coal, which is loaded in a mill body (), from fine particle exits () formed on the top of the mill body so as to be quartered in the circumferential direction to the outside by air current conveyance. The roller mill structure includes a table which rotates in the mill body (), three rollers for rotating on the table and milling the raw coal, and a rotary classifier () disposed upstream of the fine particle exits (), wherein a movable vane () for partly narrowing the cross-sectional area of a flow channel is provided at a midpoint of the flow channel for fine particle current flowing into the interior of the rotary classifier (), and proceeding toward the fine particle exits ().

Roller mill structure

To achieve an improvement in concentration distribution in a vertical direction at an inlet of a pulverized coal distributor and uniformly distribute pulverized coal to respective pulverized coal burners. A pulverized coal distributor and a gas-particle flow adjustment device provided on an upstream side of the pulverized coal distributor and at a bottom in a pulverized coal pipe to adjust pulverized coal to branch pipes in concentration are provided, the gas-particle flow adjustment device comprises a plate-shaped member provided along a substantially overall width of the pulverized coal pipe to have a substantially rectangular shape as viewed in plan view, a front edge of the gas-particle flow adjustment device is mounted pivotally to a bottom surface of the pulverized coal pipe, and an angle formed between an upper surface of the gas-particle flow adjustment device and a bottom surface of the pulverized coal pipe can be automatically adjusted on the basis of signals from flow sensors mounted to the respective branch pipes.

Pulverized coal concentration adjustment apparatus and pulverized coal combustion boiler

Growing community of inventors

Nagasaki, Japan

Masahiko Taniguchi