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

A steam turbine rotor, low-cycle fatigue technology, applied to mechanical equipment, engine components, machines/engines, etc.

Active Publication Date: 2007-09-26
SHANGHAI POWER EQUIP RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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 or equivalent stress safety margin coefficient of the steam turbine rotor equivalent stress, the yield strength σ0.2 and fracture strength σ of the material are used 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

Method used

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

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Embodiment

[0090] For the high-pressure rotor of a supercritical 600MW steam turbine with a steam inlet temperature of 566°C for a certain model, the low-cycle fatigue life loss on-line monitoring system shown in Figure 1, the artificial neural network model used in the present invention shown in Figure 2, and the artificial neural network model shown in Figure 3 are adopted. The flow chart of the method provided by the present invention and the calculation software block diagram of the method of the present invention shown in Fig. 4, the calculated equivalent stress σ of the high pressure rotor of the steam turbine in the cold start process eq , the strain amplitude ε of low cycle fatigue a and the calculation results of low cycle fatigue life loss d are listed in Fig. 5, Fig. 6 and Fig. 7, respectively.

[0091] Step 1, Step 2 and Step 7: The nominal equivalent stress σ of the outer surface fillet of the impeller of the high-pressure rotor regulating stage of the steam turbine during t...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D21/00
Inventor 史进渊杨宇邓志成黄功文
Owner SHANGHAI POWER EQUIP RES INST
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