Method for checking and analyzing numerical value of moving blade of steam turbine

Abstract

The invention discloses a method for checking and analyzing numerical value of a moving blade of a steam turbine, which comprises the following steps of: performing static vibration characteristic measurement and data analysis on a steam turbine moving blade, surveying and mapping a three-dimensional molded line of the steam turbine moving blade, and establishing a three-dimensional model of the steam turbine moving blade, a cyclic symmetric three-dimensional model of a gear train and a corresponding finite element numerical model; carrying out numerical calculation and judgment analysis on the centrifugal stress of the steam turbine moving blade under different working conditions according to the material attributes of the steam turbine moving blade; carrying out numerical calculation, analysis and evaluation on static and dynamic vibration characteristics of a single steam turbine moving blade and a wheel train; and finally, carrying out comprehensive evaluation on a steam turbine moving blade numerical check analysis result. The method has wider applicability and feasibility, the analysis result is more accurate, the application is simple and easy to understand, the method can be suitable for checking and analyzing various steam turbine moving blades, the safety and stability of the steam turbine moving blades are remarkably improved, and the method has important engineering application value for improving the safety and economy of the whole machine.

Description

technical field [0001] The invention belongs to the field of power generation of a thermal power steam turbine unit, and in particular relates to a method for checking and analyzing the numerical value of a moving blade of a steam turbine. Background technique [0002] The blade is the key component of the steam turbine, and it is also the most numerous component in the steam turbine. Under operating conditions, the steam turbine blades bear not only huge centrifugal force, but also steam force, corrosion of corrosive media, and erosion of solid particles or high-speed water droplets. The working conditions and environment are extremely complex and harsh. Blades often suffer from blade breakage or crack failure for various reasons. Accidents of steam turbine blades account for one-third of steam turbine failures, and among typical failures of steam turbine blades, the main causes of blade damage include not only design problems, but also manufacturing and operation problems...

AI Technical Summary

Problems solved by technology

The present invention has wider applicability and feasibility, more accurate analysis results, simple and easy-to-understand application, can be applied to the check and analysis of various steam turbine blades, significantly improves the safety and stability of steam turbine blades, and is beneficial to the improvement of the whole machine. The safety and economics have important engineering application value, and have solved the problems related to the numerical model processing and calculation of steam turbine blades that are not in place and the accuracy is not high.