Boiler combustion rate self-optimizing method based on PID control policy

A boiler combustion and control strategy technology, applied in the direction of electric controllers, controllers with specific characteristics, etc., can solve problems affecting the realizability, ease of use and portability of algorithms, unfavorable real-time control, and easy oscillations, etc. , to achieve optimized real-time control, fast calculation speed and easy realization

Inactive Publication Date: 2010-10-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] 1. The determination of the optimal step size mostly depends on experience;
[0007] 2. The optimization time is long, and the optimization process is prone to oscillation near the optimal point;
[0008] 3. The algorithm is relatively complex and the amount of calculation is large, which is not conducive to the realization of real-time control; at the same time, due to the simultaneous existence of mathematical operations and logic

Method used

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  • Boiler combustion rate self-optimizing method based on PID control policy
  • Boiler combustion rate self-optimizing method based on PID control policy
  • Boiler combustion rate self-optimizing method based on PID control policy

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Embodiment Construction

[0041] In the boiler system, when the unit fuel volume is mixed with the air volume (air volume) proportioned according to the ratio R, if the calorific value is the maximum value, then the boiler combustion rate is the optimal value at this time, and the "fuel-air volume" at this time "The ratio R is the optimal value R op . This relationship can be described by the F-Q curve (air volume-heat curve), which expresses the relationship between air volume and calorific value when the amount of fuel remains constant, such as figure 1 shown.

[0042] When the amount of fuel changes, the figure 1 Based on this, a family of curves can be formed, such as figure 2 shown. Each curve in the figure can express the relationship between the air volume and the calorific value when the fuel volume is a certain value. In the curve family, the further to the right the curve represents the more fuel, that is, the fuel amount of curve 1

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Abstract

The invention uses the universal PID (Proportion Integration Differentiation) control policy, can realize the self-optimization of a boiler combustion 'fuel-air' rate value by selecting and designing PID controller input signals, has the characteristics of complete self adaptation, quick searching speed, good astringency and simple algorithm, solves the outstanding and typical problems in the traditional constant value rate method in boiler combustion control that the combustion rate can not be automatically regulated along with a working condition to keep optimal, and the like and also overcomes the defects in aspects of optimizing astringency and algorithm complexity in a combustion rate self-optimizing algorithm based on fixed step sizes and variable step sizes and realizability and easy possibility in a DCS (Distributed Control System) or FCS (Fly Control System) control system. The boiler combustion rate self-optimizing method has simple algorithm, is easy to realize, is very easy to realize on the traditional DCS/FCS platform for adopting the common PID control module and has better transportability.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and relates to a self-optimizing control method for boiler combustion rate based on a PID algorithm. Background technique [0002] Boilers play an extremely important role in the energy industry and are widely used in electric power, machinery, metallurgy, chemical industry, textile, papermaking, food and other industries, and play an important role in industrial production and civil life. The boiler combustion rate is mainly reflected in the ratio of fuel and air involved in combustion. Its value directly determines whether the heat energy generated in the combustion process can be fully utilized, which is of great significance to the economical operation of the boiler, energy saving and emission reduction, and pollution reduction. [0003] Existing typical boiler combustion control systems set the fuel-air ratio constant, even though the boiler combustion process remains operating at ...

Claims

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Application Information

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IPC IPC(8): G05B11/42
Inventor 梁庚李文
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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