A control method for water supply recirculation regulating valve

Through intelligent feedforward optimization and automatic optimization control methods, the water supply flow fluctuations and minimum flow valve wear caused by low flow rate of the water supply pump during deep peak-shaving operation are solved, and the stability and safety of the water supply system under low load operation are achieved.

CN119755619APending Publication Date: 2025-04-04ZHONGTAI POWER PLANT OF HUANENG SHANDONG POWER GENERATION CO LTD SHANDONG PROVINCE
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Patent Information

Application Number
CN202510046195.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

Under the deep peak-shaving operation conditions, the flow rate of the water supply pump is too low, resulting in frequent protection of the minimum flow recirculation valve, causing large fluctuations in the water supply flow, serious wear of the minimum flow valve, and large disturbances in the control circuit, affecting the stability of the system.

Method used

Using intelligent feedforward optimization and automatic optimization control methods, by adding feedforward control and feedback adjustment, a multi-line function is built to optimize PID parameters, and automatic adjustment of water feedforward valves is realized, reducing low-opening operation of valves, reducing wear risk, and reducing control disturbances through water feed recirculation protection logic optimization.

Benefits of technology

Effectively controlling the flow rate of the steam pump and the boiler feed water flow rate within the required deviation range, improving the safety and stability of the unit's operation in the deep peak shaking stage, reducing wear of the minimum flow valve, and reducing disturbances in the control circuit.

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Abstract

The present invention relates to the technical field of boiler control, and discloses a control method for a feedwater recirculation regulating valve, including the following aspects: (1) recirculation operation process, when the pressure exceeds a certain set value, the minimum flow valve opens; when the pressure is lower than a certain set value, the minimum flow valve closes; (2) system optimization and regulation, the feedwater pump minimum flow control system only works in the feedwater pump startup and low load stages; (3) intelligent feedforward optimization of the recirculation gate, adding feedforward control, and constructing precise intelligent feedforward according to typical operating test data and unit operation data; (4) automatic optimization of the recirculation gate; (5) optimization of feedwater recirculation protection logic. Compared with the prior art, the advantages are: by optimizing the control strategy and adjusting the parameters of the steam pump recirculation regulating valve, the steam pump flow and the boiler feedwater flow can be effectively controlled within the required deviation range in the low load stage of the unit, thereby improving the safety and stability of the unit in the deep peak regulation stage.
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