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Controlling method for steam turbine high and medium pressure rotator equivalent stress

A technology of equivalent stress and control method, applied to mechanical equipment, engine components, machines/engines, etc., can solve problems such as low accuracy, slow calculation speed of equivalent stress, and inability to apply online monitoring

Active Publication Date: 2008-02-20
SHANGHAI POWER EQUIP RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The off-line calculation of the equivalent stress of the high and medium pressure rotor of the steam turbine adopts finite element numerical calculation, which has the advantage of accurate finite element numerical calculation results, but its disadvantage is that the calculation model is complex and the calculation speed of the equivalent stress is slow, which cannot be applied to the calculation of the equivalent stress of the high and medium pressure rotor of the steam turbine. Online Monitoring
The online calculation of the equivalent stress of the high and medium pressure rotor of the steam turbine adopts the analytical method or the differential method of the equal-thickness cylinder model. Its disadvantage is that the accuracy of the equivalent stress calculation results is relatively low

Method used

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  • Controlling method for steam turbine high and medium pressure rotator equivalent stress
  • Controlling method for steam turbine high and medium pressure rotator equivalent stress
  • Controlling method for steam turbine high and medium pressure rotator equivalent stress

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Embodiment

[0058] For the supercritical 600MW steam turbine high-pressure rotor with a certain model inlet steam temperature of 566°C, the flow chart of the method provided by the present invention shown in Fig. 1 is adopted, and the calculation software is written in C language, and runs on the computer of the parameter monitoring and control of the steam turbine, such as Fig. 2 shows a block diagram of the calculation software of the method of the present invention, and the calculated correction value of the high-pressure rotor equivalent stress of the steam turbine is shown in Fig. 3 to Fig. 6 .

[0059] The first and fifth steps: use the simplified model of the existing technology to calculate on-line the outer surface fillet of the high-pressure rotor regulating stage impeller of the steam turbine during the cold start process, warm state start process, hot state start process, and extremely hot state The nominal equivalent stress σ of the start-up process ne This is represented by ...

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Abstract

The invention relates to an online calculation-control method on the equivalent stress of the high-middle-pressure rotor of turbine, wherein if said factor is over preset value, it can online control the temperature change rate of main steam, and the load change rate to improve equivalent stress and prolong the service life. If the factor reaches the alarm value, it will alarm, and stop in preset time to control the equivalent stress and prolong the service life.

Description

technical field [0001] The invention relates to a method for controlling the equivalent stress of a steam turbine high and medium pressure rotor, which is applied to the online control of the steam turbine high and medium pressure rotor equivalent stress and the steam turbine life online management, and belongs 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 of the steam turbine change with time, and a relatively large equivalent stress is generated in the high and medium pressure rotors of the steam turbine. If the calculation of the equivalent stress is inaccurate, or the control of the equivalent stress is not appropriate , Excessive equivalent stress produces relatively large low-cycle fatigue damage, which shortens the service life of the steam turbine's high and medium pressure rotors. There are two methods for calculating the equivalent stress of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D21/00
Inventor 史进渊杨宇邓志成孙庆
Owner SHANGHAI POWER EQUIP RES INST
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