Online controlling method for steam turbine rotator equivalent stress safety margin coefficient

A steam turbine rotor and equivalent stress technology, applied in the field of steam turbines, can solve the problems of large equivalent stress error and affecting the accuracy of the equivalent stress of the steam turbine rotor, etc.

Active Publication Date: 2008-02-20
SHANGHAI POWER EQUIP RES INST
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Problems solved by technology

The existing technology uses the equal-thickness cylinder model to calculate the equivalent stress of the steam turbine rotor online. It is characterized by fast calculation speed and can complete a calculation within a few seconds. Compared with the equivalent stress calculated by the finite element numerical calculation of the steam turbine rotor structure, the absolute value of the calculation relative error is as high as 35%, which affects the accuracy of on-line monitoring and control of the steam turbine rotor equivalent stress safety margin coefficient

Method used

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  • Online controlling method for steam turbine rotator equivalent stress safety margin coefficient
  • Online controlling method for steam turbine rotator equivalent stress safety margin coefficient
  • Online controlling method for steam turbine rotator equivalent stress safety margin coefficient

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Embodiment

[0052] For the high-pressure rotor of a supercritical 600MW steam turbine with a steam inlet temperature of 566°C for a certain model, the artificial neural network model used in the present invention shown in Fig. 1, the flow chart of the method provided by the present invention shown in Fig. The calculation software block diagram of the inventive method, the calculation results of the calculated equivalent stress of the high-pressure rotor of the steam turbine in different start-up processes are listed in Fig. 4 to Fig. 7 .

[0053] Step 1 and Step 6: Using the simplified model of the existing technology to calculate online, the rounded corners of the outer surface of the impeller of the high-pressure rotor regulating stage of the steam turbine are obtained 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 curve 1 in FIGS. 4 to 7 .

[00...

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Abstract

The invention relates to an online detecting method on the equivalent stress safe allowance factor of the rotor of turbine, wherein it is characterized in that: it uses artificial nerve network technique to realize the online real-time calculation and online real-time detection and control on said factor; if said factor is lower than preset value, it can control the temperature change rate of main steam, and the load change rate to improve the factor and prolong the service life. If the factor reaches the alarm value, it will alarm, and stop in preset time. The invention can realize quick and accurate online real-time calculation, detection and control.

Description

technical field [0001] The invention relates to a method for realizing on-line real-time calculation, on-line monitoring and control of the equivalent stress safety margin coefficient of the steam turbine rotor by using artificial neural network technology, which is applied to the online control of the equivalent stress safety margin coefficient of the steam turbine rotor and the online life of the steam turbine rotor Management belongs to the field of steam turbine technology. Background technique [0002] In the process of steam turbine startup, shutdown and load change, the steam turbine rotor is unevenly heated or cooled, and the uneven temperature distribution of the steam turbine rotor along the radial direction produces relatively large thermal stress, which leads to an increase in the equivalent stress of the steam turbine rotor, and the safety of the equivalent stress The margin factor is reduced. A relatively small equivalent stress safety margin factor causes rel...

Claims

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Application Information

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