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Zoning Control Method of Anti-fatigue Life of Steam Turbine Rotor

A steam turbine rotor and life partitioning technology, applied in mechanical equipment, engine components, engine starting, etc., can solve the problems of lack of anti-fatigue characteristics, anti-fatigue life loss, fracture, serious liability accidents, etc., to meet the requirements of flexibility, Optimizing the rate of change and ensuring the effect of economy

Inactive Publication Date: 2011-12-14
STATE GRID HUNAN ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST +1
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AI Technical Summary

Problems solved by technology

This method lacks the calculation of anti-fatigue characteristics of materials at different temperature levels as the basis for analyzing the loss of anti-fatigue life. Therefore, the calculation results often deviate from reality, which is very unfavorable for the control of anti-fatigue life of steam turbine rotors. In severe cases, it may even lead to 600MW supercritical The rotor of the steam turbine is fatigued and fractured prematurely, resulting in huge economic losses of tens of millions of yuan and serious liability accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) The steam turbine unit of the power plant, such as the N600-24.2 / 566 / 566 type 600MW supercritical steam turbine unit, is started in a cold state, and the structural size of the steam turbine rotor of the unit and the operating parameters of the steam turbine rotor of the unit are recorded;

[0014] (2) According to the structural size of the steam turbine rotor recorded in step (1), the finite element modeling is carried out using conventional methods. For the operating parameters of the steam turbine rotor recorded in step (1), use conventional methods to perform thermal calculations under variable operating conditions, and obtain complete boundary conditions for simulation calculations under different operating conditions. Use these conditions to perform simulation calculations of temperature fields and stress fields using conventional methods simulation calculation. Then on this basis, the simulation calculation of the load spectrum of the dangerous part under di...

Embodiment 2

[0019] Steps (1)~(3) are the same as implementation 1;

[0020] (4) According to the fatigue damage value of the steam turbine rotor in the process of stress load obtained in step (3), use the conventional method to formulate the run-up, medium-speed warm-up, constant-speed warm-up, and grid-connected low load of the steam turbine rotor during the start-up process The optimal operation control scheme under different working conditions in the six stages of warm-up, cylinder cut-off and sliding pressure operation. In order to reasonably distribute the anti-fatigue life of the above-mentioned steam turbine rotor, when implementing the above scheme, when the material temperature of the steam turbine rotor is 100-200°C, keep the steam turbine rotor's rising rate between 100-150r / min, so that the steam turbine's progress The steam volume increases slowly, so that the steam turbine rotor obtains a smooth heating effect. At the same time, in order to match the steam temperature of th...

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Abstract

A steam turbine rotor anti-fatigue life partition control method, the method is the following steps: (1), start the steam turbine unit of the power plant, record the structural size and operating parameters of the steam turbine rotor; (2), finite element modeling, Thermal calculations and simulation calculations under variable working conditions; (3), peak stress calculations in different temperature zones, and material fatigue characteristics analysis; (4), formulating rush rotation, medium-speed warm-up, constant-speed warm-up, grid-connected low-load warm-up, Six-stage optimized operation control plan for cutting cylinders and entering sliding pressure operation; (5) Draw optimized start-up curves, and organize construction personnel to operate the start-up and operation of steam turbine units on site. The invention reasonably distributes the anti-fatigue life loss, optimizes the change rate of operating parameters under variable working conditions, shortens the start-up time, ensures the economy of the start-up process, and meets the flexibility requirements of the peak-shaving demand of the power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering, and relates to a method for regional control of the anti-fatigue life of a steam turbine rotor, especially a 600MW supercritical steam turbine rotor. Background technique [0002] Steam turbine rotors, especially 600MW supercritical steam turbine high and medium pressure rotors, often undergo substantial heating or cooling of structural materials in actual operation, such as cold start-up processes, etc., and their stress load spectrum usually spans a large temperature range. Mechanics theory tells us that the fatigue life of the same stress cycle amplitude at different temperature levels may vary by one or several orders of magnitude. The traditional method of calculating the anti-fatigue life of a steam turbine rotor is to use a single temperature, usually normal temperature, to calculate the anti-fatigue performance of the rotor material, and calculate the total damage degre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D19/00G06F17/50
Inventor 黄来韩彦广焦庆丰程贵兵李明陈非
Owner STATE GRID HUNAN ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST
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