Method and system for on-line monitoring steam turbine roter low-cycle fatigue life consumption

Abstract

It relates to a turbine rotor low cycle fatigue durability loss on line monitoring system, featuring in its computation, application server and software, database server, outside system interface, turbine control system DEH and parameter testing point, web server and user browser that connects with the computation and application server and each end item user browser respectively, with the computation and application server connecting with the data base server which connects with the turbine control system DEH and parameter testing point through the outside system interface. It is made of two processes, with the no.1 using artificial nerve network to determine turbine rotor equivalent stress coefficient, the no.2 process being on line computation, monitoring and control of the turbine rotor cycle fatigue loss. It realizes the working times of the turbine rotor of 10000 times.

Description

technical field [0001] The present invention relates to a method and system for online monitoring of low-cycle fatigue life loss of steam turbine rotors, in particular to an online calculation, online monitoring and control method for low-cycle fatigue life loss of steam turbine rotors, which is applied to low-cycle fatigue life loss of steam turbine rotors The on-line control and the on-line life management of steam turbine rotors belong to the technical field of steam turbines. Background technique [0002] During the start-up, shutdown and load changes of the steam turbine, the steam inlet parameters and flow-through parameters of the steam turbine change with time, the rotor of the steam turbine is heated or cooled unevenly, and the temperature distribution of the rotor along the radial direction is uneven, resulting in relatively large thermal stress. It causes the equivalent stress and low cycle fatigue life loss of the steam turbine rotor to increase. If the low-cycl...

AI Technical Summary

Problems solved by technology

The prior art uses "on-line calculation and control of relative stress of steam turbine rotor equivalent stress" application number 200610030244.X and "equivalent stress safety margin coefficient" application number 200610030243.5 to control the low cycle fatigue loss of steam turbine rotor, due to In the calculation of the relative stress of the equivalent stress of the steam turbine rotor or the safety margin factor of the equivalent stress, the yield strength σ of the material is used 0.2 and breaking strength σ fr , without using the low-cycle fatigue curve of the rotor material, so that the use of the relative stress or equivalent stress safety margin coefficient of the steam turbine rotor equivalent stress becomes a life management that indirectly rather than directly controls the low-cycle fatigue life loss of the steam turbine rotor method

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