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: 2007-02-07
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

[0053] For a certain type of supercritical 600MW steam turbine high pressure rotor with an inlet steam temperature of 566°C, the figure 1 The artificial neural network model adopted by the present invention shown, figure 2 The flow chart of the method provided by the present invention is shown and image 3 The calculation software block diagram of the method of the present invention is shown, and the calculation results of the equivalent stress of the high-pressure rotor of the steam turbine in different starting processes are listed in Figure 4 to Figure 7 .

[0054] Steps 1 and 6: Using the simplified model of the prior art to calculate on-line, the rounded corners of the outer surface of the impeller of the regulating stage of the high-pressure rotor of the steam turbine are obtained in the cold state start process, the warm state start process, the hot state start process, and the extremely hot state. The nominal equivalent stress σ of the start-up process ne exist ...

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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 the online real-time calculation, online monitoring and control of the equivalent stress safety margin coefficient of the steam turbine rotor by using the artificial neural network technology, which is applied to the online control of the steam turbine rotor equivalent stress safety margin coefficient and the online life of the steam turbine rotor. Management belongs to the technical field of steam turbines. Background technique [0002] During the start-up, shutdown and load changes of the steam turbine, the rotor of the steam turbine is not uniformly heated or cooled, and the uneven temperature distribution of the steam turbine rotor along the radial direction generates relatively large thermal stress, resulting in an increase in the equivalent stress of the turbine rotor and the safety of the equivalent stress. The margin factor is reduced. The relatively small equivalent stress safety margin factor c...

Claims

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Application Information

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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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