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Feedforward signal of drum water level control system of drum boiler

A drum water level and feedforward signal technology, applied in the field of control, can solve problems such as complex algorithms, difficult practical implementation, and difficult debugging, and achieve the effects of improving control quality, easy debugging, and overcoming negative effects

Inactive Publication Date: 2010-05-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some control methods, such as predictive control, fuzzy control, neural network control, etc., which can solve the control problems of such objects, most of them have problems such as complex algorithms and difficult debugging, which are difficult to be practical
In actual control, the single-impulse control system cannot effectively overcome the influence of "false water level", while the single-stage or cascade three-impulse control system, the introduction of steam flow feedforward will lead to more prominent negative effects of "false water level"

Method used

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  • Feedforward signal of drum water level control system of drum boiler
  • Feedforward signal of drum water level control system of drum boiler
  • Feedforward signal of drum water level control system of drum boiler

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Embodiment Construction

[0025] The present invention takes the actual application in a utility boiler as an example to illustrate the specific implementation steps. The whole scheme is divided into 5 steps to implement, and finally put into operation after configuration and debugging in the unit DCS (distributed control system).

[0026] 1. Original signal confirmation

[0027] It is necessary to confirm the furnace pressure p f (Pa), drum pressure p d (MPa), boiler fuel volume r b (kg / s), unit load N E (MW) accuracy. Among them, p f and p d For constructing feed-forward signals, large boilers are equipped with multiple p f and p d Measuring point, design two-choice average or three-choice logic for multiple measured values, in order to improve reliability, p f and p d It is necessary to take the signal of the two-choice average or three-choice logic output. r b and N E It is used to obtain the gain coefficient and filter coefficient when constructing the feedforward signal, N E With hi...

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Abstract

A feedforward signal of a drum water level control system of a drum boiler is used for overcoming the adverse impact of false water level on water level control. The feedforward signal fL(s) is specifically formed as follow, wherein s is complex variable of Laplace transform and is equivalent to differential operator in time domain, fL(s) is Laplace transform of feedforward signal fL, pf(s) is Laplace transform of furnace pressure pf, pd(s) is Laplace transform of drum pressure pd, Cb is boiler heat storage coefficient, Kf is furnace pressure gain coefficient and T is furnace pressure filter coefficient. The invention is simple and convenient in implementation, low in cost, good in control effect and high in reliability, can effectively overcome the adverse impact of false water level and greatly improve the control quality.

Description

technical field [0001] The invention relates to an improvement of boiler steam drum water level control logic, in particular to the structure of a feedforward signal that can improve the quality of steam drum water level control, and belongs to the field of control technology. Background technique [0002] For drum boilers, the water level of the drum is a key parameter reflecting the balance between the boiler energy and the working medium. High or low water levels in the drum will seriously affect the safe operation of the boiler. The water level control system of the drum (or feed water control system) ) is one of the most important control systems in boiler operation. When the operating conditions of the boiler change suddenly, such as a sudden increase in the combustion intensity of the boiler or a sudden decrease in the pressure of the steam drum, the saturated water in the water wall of the boiler and under the liquid surface of the steam drum suddenly boils, generati...

Claims

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Application Information

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IPC IPC(8): F22D5/28
Inventor 田亮刘鑫屏刘吉臻
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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