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Device for controlling coal mill

A crushing device and control device technology, applied in the direction of combustion control, control system, block/powder supply/distribution, etc., can solve problems such as difficult boiler operation, HGI and moisture content deviation, and inability to perform stable control, etc., to achieve Stabilization corresponds to the effect of control

Active Publication Date: 2011-01-12
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As mentioned above, in the case of coal of various coal types, the coal properties such as HGI and moisture content are different, so the pulverization and conveyability of the coal pulverization device are greatly different, and the load of the boiler is fluctuated, so In the case of changing the amount of coal fed, the lag in the amount of coal output from the coal crushing device interferes with the control of the steam temperature and steam pressure of the boiler, and stable control cannot be performed.
In addition, even for the same coal type, there are considerable variations in HGI and moisture content, and they are in the same state
[0009] In addition, in the past, it was difficult to operate the boiler stably because it was not possible to perform real-time control according to the performance of the coal.

Method used

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  • Device for controlling coal mill
  • Device for controlling coal mill
  • Device for controlling coal mill

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0041] figure 1 It is a block diagram showing the configuration of the control device according to the first embodiment of the present invention. The invention adds the output signal of the control system using the deviation between the standard mill coal output pattern and the currently running mill coal output pattern as a correction signal to the basic signal of the existing control system, thereby For more stable mill coal output control, the configuration of the first embodiment is to use the command value of the coal feed amount as the command signal related to the coal feed amount.

[0042] figure 1 Among them, the control device of the first embodiment is composed of a main controller 10 which is an existing control system, an additional control unit 20 , and a mill coal output estimation unit 30 .

[0043] The mill coal output estimating unit 30 measures the mill furnace differential pressure (ΔP) 31 and the air flow rate (Fa) 32 which are original detection points,...

no. 2 approach

[0056] figure 2 It is a block diagram showing the configuration of the control device according to the second embodiment of the present invention.

[0057] In the second embodiment, it is configured to use the MRS rotational speed of the coal crushing device as the command signal related to the amount of coal fed.

[0058] figure 2 Among them, the control device of the second embodiment is constituted by a main controller 10 as an existing control system, an additional control unit 20 , and a mill coal output estimation unit 30 .

[0059] The mill coal output estimation unit 30 and the additional control unit 20 are the same as those in the first embodiment.

[0060] A mill coal feed rate command 14 and a mill current 15 are input to the main controller 10, and arithmetic processing is performed based on these to obtain an MRS rotational speed command value 16. At this time, the MRS rotational speed command correction value 25 obtained by the mill coal output estimation u...

no. 3 approach

[0063] image 3 It is a block diagram showing the configuration of a control device according to a third embodiment of the present invention.

[0064] In the third embodiment, it is configured to use the load pressure of the hydraulic load device included in the coal crushing device as the command signal related to the coal feed amount. The so-called load pressure means the pressure applied to the rollers in the coal pulverizing device.

[0065] exist image 3 Among them, the control device of the third embodiment is constituted by a main controller 10 as an existing control system, an additional control unit 20 , and a mill coal output estimation unit 30 .

[0066] The mill coal output estimation unit 30 and the additional control unit 20 are the same as those in the first embodiment.

[0067] The mill coal feed command 17 and the roller lift 18 are input to the above-mentioned main controller 10, and calculation processing is performed based on these, and the pressure set...

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Abstract

Disclosed is a device for controlling a coal mill capable of estimating the amount of coal outputted with a desired accuracy. The device estimates the amount of coal pulverized by the coal mill and outputted to a boiler. The device includes a main computing circuit for computing a command signal relating to the amount of coal supplied from detected data sent from the boiler or a generator connected to the boiler and an additional control unit for computing the difference between a normal amount-of-coal-outputted pattern predetermined for the coal mill and the current amount-of-coal-outputted pattern. The result of the computation by the additional control unit is applied to the main computing circuit as a correction signal.

Description

technical field [0001] The present invention relates to a control device for a coal crushing device that feeds pulverized fuel obtained by pulverizing and pulverizing solid fuel to a boiler together with conveying air. Background technique [0002] In general, in boilers using various types of coal as fuel, the properties of the coal, such as the Hardwood Grindability Index (HGI) and moisture content, which indicate the hardness of the coal, are different, so the pulverization and conveyability of the mill are different. vastly different. When the amount of coal fed from the coal feeder to the mill changes due to fluctuations in the load of the boiler, the lag in the amount of coal output from the mill differs depending on the type of coal due to the difference in coal properties. Interference with steam pressure control. [0003] As a method for properly operating such a boiler, for example, Patent Document 1 (Japanese Patent No. 3746528 ) discloses a configuration includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C25/00F22B35/00F23K3/02F23N5/00
CPCF23N2039/02B02C15/00F23K2201/10B02C25/00F23N2239/02
Inventor 堤孝则驹田至秀谷口雅彦松本慎治藤村皓太郎末冈靖裕森山功
Owner MITSUBISHI POWER LTD
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