A method for regulating the water level in a subcritical boiler drum

By constructing a nonlinear dynamic correction model and temperature compensation in a subcritical boiler, the adaptive adjustment of the feedforward compensation coefficient is achieved, which solves the water level control problem of traditional control schemes under varying operating conditions and improves steady-state accuracy and dynamic response capability.

CN122107372APending Publication Date: 2026-05-29HUANENG TONGCHUAN ZHAOJIN COAL POWER CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUANENG TONGCHUAN ZHAOJIN COAL POWER CO LTD
Filing Date
2026-01-15
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional three-impulse control schemes cannot adapt to the nonlinear changes in steam-water characteristics under variable load and pressure conditions in subcritical boilers, which leads to overshoot, oscillation, and excessively long adjustment time in the steam drum water level control, resulting in decreased control accuracy.

Method used

A nonlinear dynamic correction model with boiler pressure and steam flow rate as inputs is constructed to realize the adaptive adjustment of the feedforward compensation coefficient under operating conditions. Combined with the temperature compensation of feedwater mass flow rate, feedwater valve opening commands are generated.

Benefits of technology

It improves the steady-state accuracy, dynamic response speed and anti-interference ability of water level control, ensuring the safety and economy of the boiler under complex operating conditions.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122107372A_ABST
    Figure CN122107372A_ABST
Patent Text Reader

Abstract

The present application relates to the technical field of boiler control, and discloses a subcritical boiler drum water level regulating method, which comprises the following steps: setting a sensor to acquire the drum water level, steam flow, feed water flow, boiler pressure and feed water temperature when the boiler is running; setting a dynamic correction model, inputting the boiler pressure and steam flow, and acquiring a pressure self-adaptive dynamic feedforward compensation signal through dynamic correction; based on the feed water temperature, carrying out density compensation on the feed water flow to acquire a feed water mass flow compensation signal; based on the deviation of the drum water level from the water level set value, combining the dynamic feedforward compensation signal and the feed water mass flow compensation signal, generating a feed water valve opening degree instruction, and through the establishment of dynamic self-adaptive feedforward compensation of pressure and steam flow and the combination of mass flow correction of feed water temperature, the water level control precision and anti-disturbance ability of the subcritical boiler under variable working conditions are significantly improved.
Need to check novelty before this filing date? Find Prior Art