JPH0449716U

JPH0449716U -

Info

Publication number: JPH0449716U
Application number: JP9237690U
Authority: JP
Priority date: 1990-09-04
Filing date: 1990-09-04
Publication date: 1992-04-27

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の構成ブロツク図、
第２図は同実施例の作用説明図、第３図は従来例
の火炉及び火炉灰処理系統図、第４図は同従来例
の火炉差圧制御説明図である。１８……ベツドアツシユクーラの駆動装置、１
９……ベツドアツシユリサイクルフイーダの駆動
装置、２０……灰リサイクルフイーダの駆動装置
、１３ａ……火炉差圧検出器、２１……第１の減
算器、２３……不感帯設定器、２４……第１の差
圧制御器、２５……第１のプログラム設定器、２
６……第２のプログラム設定器、２９……第２の
減算器、３０……第２の差圧制御器、３３……第
３の減算器、３４……第３の差圧制御器。 FIG. 1 is a block diagram of an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the operation of the same embodiment, FIG. 3 is a diagram of the furnace and furnace ash processing system of the conventional example, and FIG. 4 is an explanatory diagram of furnace differential pressure control of the conventional example. 18...Bed assembly cooler drive device, 1
9... Drive device for bed ash recycling feeder, 20... Drive device for ash recycling feeder, 13a... Furnace differential pressure detector, 21... First subtractor, 23... Dead band setting device, 24 ...First differential pressure controller, 25...First program setting device, 2
6... Second program setter, 29... Second subtractor, 30... Second differential pressure controller, 33... Third subtractor, 34... Third differential pressure controller.

Claims

[Scope of utility model registration request]

The bed ash discharged from the furnace is collected into the bed ash silo via the bed ash cooler and fed back into the furnace through the bed ash recycling feeder, and the fly ash discharged from the flue system is collected into the fly ash silo. In a circulating fluidized bed boiler in which ash is re-injected into the furnace via an ash recycling feeder, a furnace pressure difference detector provided between an upper part and a lower part of the furnace;
a first subtractor that receives the output of the furnace pressure difference detector and a differential pressure command signal from the boiler master; a dead band setter that receives the output of the subtracter and outputs an output when the input exceeds a predetermined dead band; a differential pressure controller that receives the output of the differential pressure controller and performs P1 calculation; a first program setting device that receives the output of the differential pressure controller and outputs a bed ash feeder control amount to the bed ash cooler; receive the output of the device,
A second program setter that outputs a program setting signal, a first setter that outputs a bed load recycle feeder set amount, and a second program setter that receives outputs from the setter and the second program setter.
a second differential pressure controller that receives the output of the subtracter and sends the bed ash recycle feeder control amount to the bed ash recycle feeder, and a second differential pressure controller that outputs the ash recycle feeder set amount. a third subtracter that receives the outputs of the setter and the second program setter, and a third subtracter that receives the output of the subtracter and sends the ash recycle feeder control amount to the ash recycle feeder. A furnace differential pressure control device comprising: a differential pressure controller.