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Combustion feedforward and feedback composite optimization controlling method for pulverized coal fired boiler

A technology of feed-forward feedback and optimal control, applied in the field of control, can solve the problems of lack of clear physical meaning, recognition of operating personnel, difficulty in debugging and maintenance, etc.

Inactive Publication Date: 2012-04-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The practical effect of this type of method mainly depends on the accuracy and richness of the training samples, and has the disadvantages of difficulty in debugging and maintenance, lack of clear physical meaning and poor recognition by operating personnel

Method used

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  • Combustion feedforward and feedback composite optimization controlling method for pulverized coal fired boiler
  • Combustion feedforward and feedback composite optimization controlling method for pulverized coal fired boiler
  • Combustion feedforward and feedback composite optimization controlling method for pulverized coal fired boiler

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Embodiment Construction

[0050] Attached below figure 1 And take a 600MW thermal power unit as an example to illustrate the overall technical scheme of boiler combustion feedforward feedback compound optimization control system. The optimization control system includes the following logic function modules:

[0051] (1) The division module of boiler operating conditions. The operating conditions of the boiler are divided according to the 6 switching signals of the coal mill operating state and the 2 analog signals of the main steam flow rate and the total coal feeding amount of the boiler. In the range of 50%-100% load, coal mills may run 3, 4, 5, 6 units, considering the boiler operation regulations, the front and rear walls are opposed to each other and the combustion method does not appear to burn in separate layers or the front and rear walls have two or more layers of burners on the same side There are 8, 8, 6 and 1 total of 23 legal grinding operation combinations for single-wall combustion and...

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Abstract

The invention discloses a combustion feedforward and feedback composite optimization controlling method for a pulverized coal fired boiler. The method is used for realizing dynamic accurate proportioning of wind and coal under a full working condition and in the full combustion process. According to the technical scheme, the method comprises the following steps of: determining feedforward signals according to combustion adjusting experiment data or operation personnel experience, determining feedback signals according to the thermodynamic properties and laws of the boiler, and automatically and accurately adjusting the coal quantity proportion of each burner, the primary air quantity proportion of each coal mill, the outlet temperature of each coal mill and the secondary air quantity and burning-out air quantity proportion of each burner under different working conditions to keep the burning efficiency and the NOX discharge of the boiler in an optimal state. By the method, the advantage of coexistence of a plurality of independent adjusting means of the large pulverized coal fired boiler and the advantages of high dynamic response speed of feedforward control and high static precision of feedback correction control are fully exerted, the pulverized coal fired boiler is close to the optimal state under various working conditions, the burning efficiency of the boiler is improved, and the discharge of NOX is reduced.

Description

technical field [0001] The invention relates to an optimization control method for the combustion process of a large pulverized coal boiler, which belongs to the technical field of control. Background technique [0002] Combustion optimization control is to improve boiler combustion efficiency and reduce pollutants, especially NO X One of the effective measures of emissions. According to different purposes, it can be divided into: combustion control system optimization, combustion economy and safety optimization, combustion process NO X Several types of emission optimization. The main purpose of combustion control system optimization is to improve the control quality of the existing combustion system, which is a lower-level optimization; the main purpose of combustion economy and safety optimization is to improve boiler efficiency and reduce boiler heating surface coking, tube burst and other failures; combustion process NO X The main purpose of emission optimization is ...

Claims

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Application Information

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IPC IPC(8): F23N5/00
Inventor 田亮刘鑫屏邓拓宇赵亮宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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