State feedback based fault diagnosis method for hydraulic valve of steam turbine

A state feedback and fault diagnosis technology, applied in valve devices, mechanical equipment, engine components, etc., can solve the problems of harsh working environment, high cost, complex structure of steam turbine valves, etc., and achieve the effect of reducing maintenance costs.

Active Publication Date: 2019-10-08
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex internal structure of steam turbine valves and the harsh working environment, the cost of valve maintenance according to a fixed time period is high

Method used

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  • State feedback based fault diagnosis method for hydraulic valve of steam turbine
  • State feedback based fault diagnosis method for hydraulic valve of steam turbine
  • State feedback based fault diagnosis method for hydraulic valve of steam turbine

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Embodiment Construction

[0042] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be clear to those skilled in the art that the described embodiments are only for helping to understand the present invention, and should not be regarded as specific limitations to the present invention.

[0043] The present invention provides a method for diagnosing faults of steam turbine hydraulic valves based on state feedback, which includes the steps of:

[0044] 1) Test the relationship curve between the power of the hydraulic valve and the stroke of the valve stem when the hydraulic valve has no faults. This curve is called the reference curve;

[0045] 2) After the unit is shut down, carry out the valve switch stroke test, connect the oil motor power and valve stem stroke signals to the external diagnostic system, and test the relationship curve between the oil motor power and the valve stem...

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Abstract

The invention discloses a state feedback based fault diagnosis method for a hydraulic valve of a steam turbine. The state feedback based fault diagnosis method comprises the following steps: 1) testing a relationship curve which is named as a datum curve between hydraulic servo-motor force and valve rod stroke when the hydraulic valve is free of faults; 2) performing a valve opening and closing stroke test after a unit stops, accessing a hydraulic servo-motor force and valve rod stroke signal into an external diagnosis system, and testing the relationship curve which is named as a fault curvebetween hydraulic servo-motor force and valve rod stroke of a to-be-detected valve; and 3) comparing and analyzing the fault curve with the datum curve, detecting anomaly in an operation state of a valve rod, a valve rod lining sleeve and a spring, determining the valve state through the anomaly, predicting valve faults, and making a valve maintenance schedule according to a valve state condition.The state feedback based fault diagnosis method detects the anomaly in the operation state of the valve rod, the valve rod lining sleeve and the spring through feedback of the hydraulic servo-motor force and valve rod stroke curve, so that the valve state is determined through the anomaly to predict the valve faults.

Description

technical field [0001] The invention relates to the field of operating state diagnosis of power plant equipment, in particular to a state feedback-based fault diagnosis method for hydraulic valves of steam turbines. Background technique [0002] Steam turbine valves generally include a main steam valve and a regulating valve. The valve control adopts an electro-hydraulic servo system, and the control medium adopts high-pressure anti-fuel oil. The core element of the electrohydraulic servo system is the servo valve. The servo valve controls the movement of the spool according to the deviation signal formed by the DEH given electric signal and the feedback electric signal, so as to control the piston of the oil motor to drive the movement of the valve stem. The steam turbine valve controls the steam flow into the steam turbine during normal operation of the unit to control the load of the unit. When the load is shed, it is quickly closed to isolate the steam so as to prevent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K37/00
CPCF16K37/0083
Inventor 丁阳俊顾正皓张宝鲍文龙高宽应光耀
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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