CN102024070A - Method for evaluating life of generator rotor and rotor retaining ring - Google Patents
Method for evaluating life of generator rotor and rotor retaining ring Download PDFInfo
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- CN102024070A CN102024070A CN2009101958816A CN200910195881A CN102024070A CN 102024070 A CN102024070 A CN 102024070A CN 2009101958816 A CN2009101958816 A CN 2009101958816A CN 200910195881 A CN200910195881 A CN 200910195881A CN 102024070 A CN102024070 A CN 102024070A
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- end bell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a method for evaluating the life of a generator rotor and a rotor retaining ring. The method comprises the following steps of: A, determining various states of the rotor and the rotor retaining ring and performing thermal influence analysis; B, establishing a system model for a temperature field and a stress field of the rotor and the rotor retaining ring; C, performing finite element computational analysis on the system model of the temperature field and the stress field; and D, performing life damage analysis. According to the life evaluation method, the effect of effectively evaluating the service life of the generator rotor and the rotor retaining ring can be achieved, and the life evaluation technology of the whole steam turbine generating set is perfected.
Description
Technical field
The present invention relates to the lifetime estimation method of fuel-burning power plant gen-set, the lifetime estimation method of particularly a kind of fuel-burning power plant generator amature and rotor end bell.
Background technology
Fuel-burning power plant Turbo-generator Set life appraisal is an important technique measure guaranteeing the unit safety reliability service.In recent years, ripe relatively to the life appraisal of critical components such as turbine rotor and boiler-steam dome, it has all played vital role to the safe operation of instructing unit, the aspects such as safety assessment of determining rational start stop mode, unit participation peak regulation.Particularly the longevity assessment technology is used for fields such as unit transformation and repair based on condition of component, makes the integrality of this technology just seem very important.
But at present, for Turbo-generator Set, only to the height of steam turbine, middle pressure rotor and valve casing, cylinder, parts such as the drum of boiler and collection case have been set up ripe stress analysis and life assessment technology, but, all do not set up suitable life assessment method to the rotor of generator and relevant some important rotatable parts such as retaining ring etc.And generator is because after participating in factor such as peak regulation, because of defective insulation and cool off the influence degree that rotor is caused such as overheated that is caused such as improper, can not be second to turbine rotor because the influence that the cold and hot start and stop cause rotor life.
Retaining ring is the parts of the stressed maximum of turbodynamo, and it bears the stress that is produced by interference fit in stationary state, bears the stress that self centrifugal force, end coil centrifugal force and residue interference produce during operation.And generator is owing to participating in factor such as peak regulation or owing to the reason of electric aspect itself causes fault, the influence that retaining ring produced also being can not ignore in the life-span at whole turbodynamo.Particularly in unit transformation and repair based on condition of component implementation process, the assessment of retaining ring state should or be omited.Set up the lifetime estimation method that a cover is applicable to fuel-burning power plant hydrogen-cooled machine air cooled generator rotor and retaining ring, can instruct production better.
Summary of the invention
In view of above-mentioned prior art, task of the present invention provides the lifetime estimation method of a kind of fuel-burning power plant generator amature and rotor end bell, and it has overcome the defective of prior art, to reach the effective assessment generator amature device purpose in serviceable life.
Technical solution of the present invention is as follows:
The lifetime estimation method of a kind of generator amature and rotor end bell, it comprises the following steps:
A, determine several states of rotor and rotor end bell and carry out the heat affecting analysis;
B, the temperature field and the stress field of rotor and rotor end bell are set up system model;
C, the system model of temperature field and stress field is carried out finite element method (fem) analysis;
D, carry out the life damage analysis.
The state of described steps A rotor and rotor end bell has stationary state, steady operational status, cold start, hot starting, hot start and stopping process.
First research key of the present invention is how to determine quantitatively that rotor is in operation process, comprise start and stop stage, phase run, bear the abnormal failure stage, because parameters such as wind, water, electricity change the temperature of rotor stress distribution that is caused, heat interchange type and process how to determine between rotor, winding and the heat eliminating medium have wherein also been comprised, quantitatively determine heat exchange coefficient, the foundation of the computation model of parts such as rotor, the analysis of stress.Second research key of the present invention is the research of life damage mechanism and the foundation of life assessment method.By research, can set up the longevity assessment technology of parts such as a cover generator amature, and then improve the longevity assessment technology of whole Turbo-generator Set above-mentioned two gordian techniquies.
Description of drawings
Accompanying drawing is the schematic flow sheet of the lifetime estimation method of a kind of generator amature of the present invention and rotor end bell.
Embodiment
Further specify the lifetime estimation method of generator amature of the present invention and rotor end bell below in conjunction with accompanying drawing and preferred embodiment.
By the lifetime estimation method of a kind of fuel-burning power plant generator amature of the present invention and rotor end bell, it is set up process and is:
By analysis, determine parts in the heat interchange mechanism of different operation phase, thereby determine the boundary condition of generator amature and rotor end bell work the structure and the principle of work of generator amature and rotor end bell; By force analysis, determine its mechanical model and computation model to above-mentioned member; Adopt Finite Element Method to carry out temperature field and stress field computational analysis; Carry out the analysis of micromechanism of damage according to result of calculation, thereby set up lifetime estimation method.
Described lifetime estimation method comprises the following steps:
1, determines the various states of rotor and rotor end bell and carry out the heat affecting analysis.The state of rotor and rotor end bell has stationary state, steady operational status, cold start, hot starting, hot start and stopping process.
2, the temperature field and the stress field of rotor and rotor end bell are set up system model.
3, the system model to temperature field and stress field carries out finite element method (fem) analysis.
4, carry out the life damage analysis.
In real work, when generator participates in peaking operation (frequent load lifting) and two-shift operation (frequent start-stop), defective insulation can take place and cool off phenomenons such as improper, thereby cause the overheated life-span to generator amature of rotor to exert an influence.Retaining ring is the parts of the stressed maximum of turbodynamo, it bears the stress that is produced by interference fit in stationary state, bear the stress that self centrifugal force, end coil centrifugal force and residue interference produce during operation, generator is owing to participating in factor such as peak regulation or owing to the reason of electric aspect itself causes fault, also can influencing the serviceable life of retaining ring.
Lifetime estimation method is exactly a working environment of at first understanding evaluation object, determines environment to the influence factor in life-span, and these factors of quantitative Analysis and life relation respectively are last according to evaluation object its residual life of prediction of working condition in future then.
In the course of work of generator amature and rotor end bell, the temperature difference at each position, we are called the temperature field with the set of temperature on each aspect in its material system.It is the function of time and volume coordinate.This quantity of temperature T normally volume coordinate (x, y, z) and the function of time variable, promptly T=(x, y, z).This is three-dimensional unstable state temperature field (transient state temperature field), and the heat conduction that takes place in this temperature field is three-dimensional unstable state (transient state) heat conduction.Not time-varying temperature field is called the steady temperature field, and promptly (z), be three-dimensional steady state heat conduction this moment to T=for x, y.For a peacekeeping two-dimensional temperature field, can be expressed as respectively during stable state T=f (x) and T=f (x, y), then be expressed as respectively during unstable state T=f (x, t) and T=f (x, y, t).
We need introduce the notion of finite element analysis in to the calculating in temperature field.The key concept of finite element analysis (FEA, Finite Element Analysis) is to replace finding the solution behind the challenge with better simply problem again.It will be found the solution the territory and regard as by many little interconnection subdomains that are called finite element and form, to suitable (better simply) approximate solution of each unit supposition, derive then and find the solution total the satisfying condition in this territory (as the equilibrium condition of structure), thereby obtain separating of problem.This is separated and is not accurately to separate, but approximate solution, because practical problems is replaced by better simply problem.Because most of practical problemss are difficult to accurately be separated, and finite element computational accuracy height not only, and can adapt to various complicated shapes, thereby become effective engineering analysis means.
Finite element is that those gather together and can represent the discrete unit of actual continuous domain.The notion of finite element just produces and has obtained application before several centuries, and for example use polygon (limited straight line units) to approach circle and try to achieve round girth, but be suggested as a kind of method, then be nearest thing.Finite element method is called as the approximate matrix method at first, is applied to the Strength Calculation of aircraft, and causes the scientist's who is engaged in mechanics study great interest owing to its convenience, practicality and validity.Effort through short many decades, along with the fast development of computer technology with popularize, Finite Element Method expands to nearly all science and technology field from the Structural Engineering strength analysis calculation rapidly, become a kind of rich and varied, be widely used and the numerical analysis method of practicality and high efficiency.
In the present embodiment, the basic step of finite element solving problem is:
The first step: problem and find the solution territory definition.
Determine to find the solution the physical property and the geometric areas in territory according to practical problems is approximate.
Second step: find the solution the territory discretize.
Be approximately the discrete domain that limited unit having different limited sizes and shape and be connected with each other formed with finding the solution the territory, be called mesh of finite element traditionally and divide.Obviously then the degree of approximation of discrete domain is good more in unit more little (network is thin more), and result of calculation is also accurate more, but calculated amount and error all will increase, so the discretize of finding the solution the territory is one of core technology of finite element method.
The 3rd step: determine state variable and control method.
A concrete physical problem can be represented with one group of differential equation that comprises problem state variable boundary condition usually, for being fit to finite element solving, usually the differential equation is turned to functional form of equal value.
The 4th step: derive in the unit.
To suitable approximate solution of unit structure, promptly the derive row formula of finite elements comprising selecting rational unit coordinate system, is set up the unit trial function, someways provide the discrete relationship of each state variable of unit, thereby form cell matrix (claiming Stiffness Matrix or Flexibility Matrix in the structural mechanics).
In order to guarantee the convergence of problem solving, deriving in the unit has many principles to follow.Engineering is used, be important to note that the solve a problem performance and the constraint of each unit.For example, cell configuration should be with rule for well, and not only precision is low during deformity, and defective danger, will cause and can't find the solution.
The 5th step: general assembly is found the solution.
With the global matrix equation (associating system of equations) of unit general assembly formation discrete domain, the requirement that the discrete domain in territory is found the solution in the reflection pairing approximation, promptly the continuity of unit function will satisfy certain condition of continuity.General assembly is to carry out at the adjacent cells node, and state variable and derivative thereof (if possible) continuity is based upon the node place.
The 6th step: Simultaneous Equations is found the solution with the result and is explained.
Finite element method finally causes Simultaneous Equations.Simultaneous Equations find the solution available direct method, iteration and random approach.Solving result is the approximate value of node place, unit state variable.For the quality of result of calculation, will relatively estimate and need determine whether double counting by the permissible value that provides with design criteria.
In brief, the finite element analysis in the present embodiment can be divided into three phases, pre-treatment, processing and aftertreatment.Pre-treatment is to set up finite element model, finishes unit grid and divides; Aftertreatment then is the acquisition process analysis result, makes the easy information extraction of user's energy, understands result of calculation.
Can certainly use large-scale general finite element business software, as: NASTRAN, ASKA, SAP, ANSYS, MARC, ABAQUS, JIFEX etc.
In summary, the lifetime estimation method of a kind of generator amature provided by the invention and rotor end bell has overcome the defective of prior art, has reached the effect in effective assessment generator amature and rotor end bell serviceable life.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.
Claims (2)
1. the lifetime estimation method of generator amature and rotor end bell is characterized in that it comprises the following steps:
A, determine several states of rotor and rotor end bell and carry out the heat affecting analysis;
B, the temperature field and the stress field of rotor and rotor end bell are set up system model;
C, the system model of temperature field and stress field is carried out finite element method (fem) analysis;
D, carry out the life damage analysis.
2. the lifetime estimation method of generator amature according to claim 1 and rotor end bell is characterized in that, the state of described steps A rotor and rotor end bell has stationary state, steady operational status, cold start, hot starting, hot start and stopping process.
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| CN2009101958816A CN102024070A (en) | 2009-09-18 | 2009-09-18 | Method for evaluating life of generator rotor and rotor retaining ring |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278152A (en) * | 2011-07-14 | 2011-12-14 | 湖南省电力公司科学研究院 | Partition control method for fatigue resisting life of steam turbine rotor |
| CN103726888A (en) * | 2014-01-02 | 2014-04-16 | 上海电气电站设备有限公司 | Method for monitoring low cycle fatigue of steam turbine rotor on line |
| CN109829220A (en) * | 2019-01-23 | 2019-05-31 | 北京交通大学 | The multi- scenarios method calculation method of the Rotor's Transient Temperature of air-cooled steam turbine generator |
| CN111404333A (en) * | 2020-01-17 | 2020-07-10 | 华中科技大学 | Method and system for acquiring electromagnetic force waveform of motor end winding |
-
2009
- 2009-09-18 CN CN2009101958816A patent/CN102024070A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278152A (en) * | 2011-07-14 | 2011-12-14 | 湖南省电力公司科学研究院 | Partition control method for fatigue resisting life of steam turbine rotor |
| CN103726888A (en) * | 2014-01-02 | 2014-04-16 | 上海电气电站设备有限公司 | Method for monitoring low cycle fatigue of steam turbine rotor on line |
| CN109829220A (en) * | 2019-01-23 | 2019-05-31 | 北京交通大学 | The multi- scenarios method calculation method of the Rotor's Transient Temperature of air-cooled steam turbine generator |
| CN111404333A (en) * | 2020-01-17 | 2020-07-10 | 华中科技大学 | Method and system for acquiring electromagnetic force waveform of motor end winding |
| CN111404333B (en) * | 2020-01-17 | 2021-07-02 | 华中科技大学 | Method and system for acquiring electromagnetic force waveform of motor end winding |
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Application publication date: 20110420 |