Fault diagnosis method for through-flow part of steam turbine based on thermal parameters

A technology of flow parts and thermal parameters, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as poor sensitivity to direct thermal parameter changes, inability to detect changes in unit performance in time, and delay in response, and achieve accuracy. High, simple method, simple system effect

Active Publication Date: 2020-07-03
HUANENG POWER INT INC +2
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Problems solved by technology

[0003] At present, operators are less sensitive to changes in direct thermal parameters, and cannot detect unit performance changes in time. Only when the fault develops to a certain extent and causes obvious mechanical vibration can the operators detect it, and there is a problem of response lag.

Method used

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  • Fault diagnosis method for through-flow part of steam turbine based on thermal parameters
  • Fault diagnosis method for through-flow part of steam turbine based on thermal parameters
  • Fault diagnosis method for through-flow part of steam turbine based on thermal parameters

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] see figure 1 , the present invention comprises the following steps:

[0023] Step 1. Real-time collection of various parameters in the operation of the steam turbine, including the pressure and temperature of each level group and each extraction port, the pressure and temperature of the inlet and outlet of the heater, the drain temperature and the main condensate flow rate, and use the "Water and Water Vapor Properties" calculates the enthalpy and entropy values ​​of steam and water;

[0024] Step 2, according to the pressure of each steam leakage point, the functional relationship between the flow rate of each steam leakage point and the pressure of the steam leakage point is established;

[0025] Step 3, calculating the steam extraction volume of each steam extraction port through heat balance;

[0026] Step 4, calculate the characteristic flow area of ​​ea...

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Abstract

The invention discloses a fault diagnosis method for a through-flow part of a steam turbine based on thermal parameters. The fault diagnosis method based on thermal parameter fault diagnosis has a fault pre-judging ability before accidents happen and is simple. Compared with primary parameters such as pressure and temperature, system performance change can be reflected intuitively based on a result of grade group efficiency and characteristic through-flow area, so that the method is intuitive. The method can judge a fault position precisely according to the result of grade group efficiency andcharacteristic through-flow area, so that the method is relatively high in accuracy. The method can judge whether a grade group has a fault or not truly based on a corresponding relationship betweenvalve change and grade group efficiency and characteristic through-flow area. In the method, a fault database exists, and a fault reason can be diagnosed by combining the grade group efficiency and characteristic through-flow area. According to data used in the method, measuring points are not added in an original data collection system of a power plant, so that independent data collection systemis not needed, and therefore, the system is simple.

Description

technical field [0001] The invention belongs to the field of performance evaluation of a steam turbine body in a thermal power plant, and in particular relates to a method for diagnosing a fault of a flow part of a steam turbine based on thermal parameters. Background technique [0002] The flow capacity of the steam turbine is the core performance index of the steam turbine, but it is in the high-temperature, high-pressure, and high-speed working environment for a long time, and it is very prone to failure. The flow capacity monitoring and fault diagnosis of the steam turbine are very important to ensure the stable, safe and economical operation of the steam turbine unit. is of great significance. However, the current fault diagnosis system almost always analyzes the vibration of the shaft system to diagnose the mechanical fault of the steam turbine. It belongs to the post-diagnosis, that is, the vibration phenomenon can only occur after the thermal parameters and system pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D21/00
CPCF01D21/003
Inventor 薛朝囡高庆张永海石慧屈杰谷伟伟曾立飞高登攀
Owner HUANENG POWER INT INC
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