Regulation valve cavitation diagnosis system and method

Abstract

The invention relates to a regulation valve cavitation diagnosis system and method. A regulation valve testing pipeline system comprises a multistage centrifugal pump, a multistage centrifugal pump frequency changer, a to-be-tested regulation valve of a diagnosed object, an upstream stop valve, a downstream throttle valve and a system pipeline to be tested, wherein the multistage centrifugal pumpis used for providing relative pressure; the multistage centrifugal pump frequency changer is used for regulating the revolving speed of the multistage centrifugal pump; and the upstream stop valve and the downstream throttle valve are respectively arranged in front of and behind the to-be-tested regulation valve. According to the invention, through adopting the above technology, upstream pressurein front of the to-be-tested regulation valve, downstream pressure behind the to-be-tested regulation valve, Z-axis vibration acceleration behind the to-be-tested regulation valve and flow in front of the to-be-tested regulation valve are utilized for calculating and judging whether cavitation happens or not; through a cavitation diagnosis device, the cavitation parameters of the regulation valveunder a certain aperture are diagnosed, so that a condition for cavitation under a current regulation valve aperture can be accurately obtained, and the effectiveness value of the vibration acceleration, working condition parameters, cavitation parameters and cavitation severity coefficients can be solved, so that the cavitation diagnosis evaluation of the regulation valve is realized.

Description

technical field [0001] The invention relates to a control valve cavitation diagnosis system and a diagnosis method thereof. Background technique [0002] As an important executive component in the process control system, the regulating valve is a key concern whether it operates safely, stably and reliably. Among them, cavitation is a common phenomenon in the control valve. [0003] Cavitation is divided into two processes, namely flashing and cavitation: flashing is when the incompressible fluid flows through the regulating valve, the static pressure from the contraction section to the valve outlet is reduced to be equal to or lower than the temperature of the fluid at the valve inlet When the saturated vapor pressure is lower, part of the liquid vaporizes to form a vapor-liquid two-phase phenomenon behind the valve; cavitation is when the incompressible fluid flows through the regulating valve, the static pressure from the contracted flow section to the valve outlet decrea...

AI Technical Summary

Problems solved by technology

[0005] At present, there is no more research on the detection and diagnosis of cavitation in China, but cavitation evaluation of control valves is required under many working conditions

Images