Double-drive steam turbine rotor stress monitoring method

A steam turbine rotor and stress monitoring technology, applied in computer-aided design, special data processing applications, instruments, etc., can solve problems such as large errors, inability to obtain accurate stress values, and low calculation accuracy, so as to prolong rotor life and shorten start-up. Stop time, high precision effect

Active Publication Date: 2021-08-27
INNER MONGOLIA JINGTAI POWER GENERATION +1
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AI Technical Summary

Problems solved by technology

Regardless of domestic or foreign rotor stress monitors or rotor stress monitors, the mathematical model of the rotor stress is a simplified formula that directly adopts the theoretical solution of the one-dimensional temperature field. get the exact value of the stress
If the calculation of the life loss of the rotor in the process of starting, stopping and changing load is based on this, large errors will occur

Method used

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  • Double-drive steam turbine rotor stress monitoring method
  • Double-drive steam turbine rotor stress monitoring method
  • Double-drive steam turbine rotor stress monitoring method

Examples

Experimental program
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Effect test

Embodiment

[0075] A dual-drive steam turbine rotor stress monitoring method, comprising the following steps:

[0076] S100. Real-time data acquisition: set the measuring points of the steam turbine, and obtain the steam parameters of each measuring point during the operation of the steam turbine in real time;

[0077] Considering the real-time fluctuation of the measured data during the operation of the unit, in order to obtain more accurate real-time measured data, the steam value obtained at each measuring point is preprocessed in this embodiment.

[0078] Specifically, the steam parameters in the step S100 include cylinder temperature values ​​and regenerative extraction steam temperature values, and data preprocessing is performed on the cylinder temperature values ​​and regenerative extraction steam temperature values ​​obtained at different times for each measuring point:

[0079] First, select n time points t for each measuring point i , t i+1 ,...,t n-1 , t n The correspondin...

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PUM

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Abstract

The invention relates to a double-drive steam turbine rotor stress monitoring method, which optimizes real-time data obtained by measuring points by constructing a virtual sensor, so that the obtained measurement data is more accurate and real. The temperature field and the stress field of the rotor are calculated according to boundary conditions obtained through variable working condition calculation of the through-flow part of the steam turbine, so that a numerical calculation result is more consistent with the real condition of the rotor; the finally obtained rotor stress monitoring model has higher precision, can accurately reflect the stress condition of the double-drive steam turbine rotor, can also reflect the actual service life loss of the rotor, and evaluates and monitors the service life of the rotor.

Description

technical field [0001] The invention belongs to the technical field of steam turbine rotor stress monitoring, and relates to a double-drive steam turbine rotor stress monitoring method. Background technique [0002] During the operation of the steam turbine rotor of the thermal power unit, its working environment is very harsh. It not only bears the joint action of itself, the centrifugal force of the blade, the steam flow force and the alternating stress, but also suffers from the creep effect of the material caused by the high temperature. The damage to the rotor material caused by high temperature and high stress load will increase the life loss of the steam turbine, shorten the service life of the steam turbine, and even cause serious accidents such as the fracture of the large shaft in severe cases. The mechanical analysis of the steam turbine rotor is a very complicated problem. There is no effective means to directly measure its metal temperature and thermal stress, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06F30/27G06F119/02G06F119/04G06F119/08G06F119/14
CPCG06F30/17G06F30/23G06F30/27G06F2119/02G06F2119/04G06F2119/08G06F2119/14
Inventor 李民王建梅胡念苏李世雄胡朝友李强刘立鹏曾宪江白永军
Owner INNER MONGOLIA JINGTAI POWER GENERATION
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