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

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 ...

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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 logical judgments in the algorithm, it is difficult to use the existing distributed control system (DCS) or field bus control The analog process control basic module provided by the system (FCS) requires the user to use various programming languages ​​related to the control system and platform to program separately, which greatly affects the realizability of the algorithm based on the DCS / FCS control platform. Ease of use and portability

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