A water supply pump set anti-cavitation protection system and method

By introducing a thermal main system, a diversion bypass system, a micro-flow field actuator, and an intelligent control center into the feedwater pump set, a high-speed fluid film is formed, which solves the cavitation cavitation problem of the feedwater pump set under the transient pressure drop condition of the deaerator, and realizes the stable operation of the system and cavitation protection.

CN122129452APending Publication Date: 2026-06-02HUANENG POWER INT INC YINGKOU POWER PLANT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUANENG POWER INT INC YINGKOU POWER PLANT
Filing Date
2026-04-10
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Feedwater pump sets are prone to cavitation cavitation under transient pressure drop conditions in the deaerator, and passive protection measures have hysteresis effects and hydraulic impact risks.

Method used

A cavitation protection system is adopted, which includes a thermal main system, a diversion bypass system, a micro-flow field actuator, and an intelligent control center. The diversion bypass system delivers high-pressure fluid to the micro-flow field actuator, and a high-speed fluid film is formed by using micro-contraction nozzles and asymmetric Coanda wall-attached rectifying surfaces. This film is then injected into the suction surface region of the first-stage impeller. Combined with the intelligent control center, adaptive control is performed to suppress the expansion of vaporization nuclei and the generation of macroscopic cavitation bubbles.

Benefits of technology

This technology effectively blocks the generation of macroscopic cavitation cavitation bubbles under transient pressure reduction conditions in the deaerator, maintains continuous liquid flow in the impeller, reduces water hammer effects, and ensures stable system operation.

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Abstract

This invention discloses a cavitation protection system and method for a feedwater pump set, comprising a main thermal system, a bypass system, a micro-flow field actuator, and an intelligent control center. The intelligent control center calculates the deaerator pressure change rate. When the rate is less than the feedforward trigger threshold, it drives a high-frequency servo solenoid valve to open. High-pressure fluid is accelerated through a micro-contraction nozzle to form a fluid micro-jet, flowing along the asymmetric Coanda wall-attached rectifying surface. This injects momentum into the fluid boundary layer of the first-stage impeller suction surface, increasing the local static pressure of the fluid to exceed the saturated vapor pressure. This pressure difference physically compresses the micro-vaporization nuclei, inhibiting the formation of macro-cavitation cavitation bubbles. The control hysteresis loop interval is used to suppress frequent start-stop of the actuator. This invention achieves the destruction of the physical critical condition for the volume expansion of vaporization nuclei, utilizes a positive suppression pressure difference to compress the volume of micro-vaporization nuclei, thereby blocking the formation of macro-cavitation cavitation bubbles and maintaining continuous liquid phase flow in the impeller, thus providing cavitation protection.
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