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

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...

AI Technical Summary

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.

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