CN112594015A - Steam turbine service life prediction method and system - Google Patents
Steam turbine service life prediction method and system Download PDFInfo
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- CN112594015A CN112594015A CN202011321090.6A CN202011321090A CN112594015A CN 112594015 A CN112594015 A CN 112594015A CN 202011321090 A CN202011321090 A CN 202011321090A CN 112594015 A CN112594015 A CN 112594015A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- General Engineering & Computer Science (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a method and a system for predicting the service life of a steam turbine, wherein the method comprises the following steps: determining the stress distribution of a steam turbine shafting; determining an axis track by using three displacement sensors; determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axis track; determining a total loss from the fatigue loss and the creep loss; and predicting the service life of the steam turbine according to the total loss. The method comprehensively considers the stress of the steam turbine shafting and the change of the axle center track to predict the service life of the steam turbine, and improves the accuracy of service life prediction of the steam turbine.
Description
Technical Field
The invention relates to the technical field of service life prediction, in particular to a method and a system for predicting service life of a steam turbine.
Background
In the process of starting and stopping the steam turbine, creep deformation and fatigue action exist at the same time, and the two actions do not act on materials independently, but influence the service life of the steam turbine through a coupling condition. The information of stress, strain, displacement and the like can be used as the basis for calculating the service life, the key parts possibly suffering from fatigue damage are provided, and a stress spectrum and a strain spectrum are formed and used as the basis for processing the low-cycle fatigue life loss. However, the existing method for predicting the service life of the steam turbine only considers the stress and does not consider the change of the axle center track at all, so that the problem of low service life prediction precision of the steam turbine exists.
Disclosure of Invention
Based on this, the invention aims to provide a method and a system for predicting the service life of a steam turbine so as to improve the accuracy of prediction.
In order to achieve the above object, the present invention provides a method for predicting a life of a steam turbine, the method comprising:
step S1: determining the stress distribution of a steam turbine shafting;
step S2: determining an axis track by using three displacement sensors;
step S3: determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axis track;
step S4: determining a total loss from the fatigue loss and the creep loss;
step S5: and predicting the service life of the steam turbine according to the total loss.
Optionally, the determining the stress distribution of the steam turbine shafting specifically includes:
step S11: defining a boundary condition;
step S12: determining a load parameter using finite element analysis software and the boundary condition;
step S13: calculating an average stress using the load parameters;
step S14: determining a stress concentration coefficient according to the material;
step S15: and determining the stress distribution of the steam turbine shafting according to the stress concentration coefficient and the average stress.
Optionally, the determining the axis trajectory by using three displacement sensors specifically includes:
step S21: three displacement sensors are adopted to detect the change of the clearance between the shafting and the sensors;
step S22: and determining the axle center track according to the gap change.
Optionally, the load parameters include pressure load, restraint load, rotation load and temperature load.
Optionally, the stress concentration factor comprises a geometric stress concentration factor and a temperature concentration factor.
The invention also provides a steam turbine life prediction system, which comprises:
the stress distribution determining module is used for determining the stress distribution of the steam turbine shafting;
the axis track determining module is used for determining an axis track by using the three displacement sensors;
the loss determining module is used for determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axle center track;
a total loss determination module for determining a total loss from the fatigue loss and the creep loss;
and the service life prediction module is used for predicting the service life of the steam turbine according to the total loss.
Optionally, the stress distribution determining module specifically includes:
a condition defining unit for defining a boundary condition;
a load parameter determination unit for determining a load parameter using finite element analysis software and the boundary condition;
a mean stress calculation unit for calculating a mean stress using the load parameter;
the stress concentration coefficient determining unit is used for determining a stress concentration coefficient according to the material;
and the stress distribution determining unit is used for determining the stress distribution of the steam turbine shafting according to the stress concentration coefficient and the average stress.
Optionally, the axis trajectory determination module specifically includes:
the clearance change determining unit is used for detecting the clearance change between the shafting and the sensors by adopting three displacement sensors;
and the axle center track determining unit is used for determining the axle center track according to the gap change.
Optionally, the load parameters include pressure load, restraint load, rotation load and temperature load.
Optionally, the stress concentration factor comprises a geometric stress concentration factor and a temperature concentration factor.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a method and a system for predicting the service life of a steam turbine, wherein the method comprises the following steps: determining the stress distribution of a steam turbine shafting; determining an axis track by using three displacement sensors; determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axis track; determining a total loss from the fatigue loss and the creep loss; and predicting the service life of the steam turbine according to the total loss. The method comprehensively considers the stress of the steam turbine shafting and the change of the axle center track to predict the service life of the steam turbine, and improves the accuracy of service life prediction of the steam turbine.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for predicting the life of a steam turbine according to an embodiment 1 of the present invention;
fig. 2 is a structural diagram of a turbine life prediction system according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for predicting the service life of a steam turbine so as to improve the accuracy of prediction.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
As shown in fig. 1, the present invention discloses a method for predicting the life of a steam turbine, comprising:
step S1: and determining the stress distribution of the steam turbine shafting.
Step S2: and determining the axis track by using three displacement sensors.
Step S3: and determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axle center track.
Step S4: determining a total loss from the fatigue loss and the creep loss.
Step S5: and predicting the service life of the steam turbine according to the total loss.
The individual steps are discussed in detail below:
step S1: determining the stress distribution of a steam turbine shafting, and specifically comprising the following steps:
step S11: boundary conditions are defined.
Step S12: determining a load parameter using finite element analysis software and the boundary condition; the load parameters include pressure load, restraint load, rotational load, and temperature load.
Pressure load: the pressure load should be calculated for all surfaces in the pressure vessel that are in contact with the steam.
And (3) restraining load: if two parts are in contact with each other, in order to keep relative static, a restraining load is generated on the contact surface, and the load size needs to be determined according to an actual load value.
Rotating load: rotating parts inside the turbine generate centrifugal stress, which is proportional to the square of the rotational speed.
Temperature load: during the start-stop and variable load process of the steam turbine, a thermal stress is generated due to the uneven distribution of the temperature, and the magnitude of the stress is related to the temperature gradient distribution.
Step S13: and calculating the average stress by using the load parameters.
Step S14: determining a stress concentration coefficient according to the material; the stress concentration factor includes a geometric stress concentration factor and a temperature concentration factor.
Step S15: and determining the stress distribution of the steam turbine shafting according to the stress concentration coefficient and the average stress.
Step S2: the method for determining the axis track by using the three displacement sensors specifically comprises the following steps:
step S21: three displacement sensors are adopted to detect the change of the clearance between the shafting and the sensors.
Step S22: and determining the axle center track according to the gap change.
Example 2
As shown in fig. 2, the present invention also provides a steam turbine life prediction system, comprising:
the stress distribution determining module 1 is used for determining the stress distribution of the steam turbine shafting.
And the axis track determining module 2 is used for determining the axis track by using three displacement sensors.
And the loss determining module 3 is used for determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axle center track.
And a total loss determination module 4 for determining a total loss according to the fatigue loss and the creep loss.
And the service life prediction module 5 is used for predicting the service life of the steam turbine according to the total loss.
The various modules are discussed in detail below:
as an embodiment, the stress distribution determining module 1 of the present invention specifically includes:
and the condition defining unit is used for defining the boundary condition.
A load parameter determination unit for determining a load parameter using finite element analysis software and the boundary condition; the load parameters include pressure load, restraint load, rotational load, and temperature load.
And the average stress calculating unit is used for calculating the average stress by using the load parameters.
The stress concentration coefficient determining unit is used for determining a stress concentration coefficient according to the material; the stress concentration factor includes a geometric stress concentration factor and a temperature concentration factor.
And the stress distribution determining unit is used for determining the stress distribution of the steam turbine shafting according to the stress concentration coefficient and the average stress.
As an embodiment, the axis trajectory determination module 2 of the present invention specifically includes:
and the clearance change determining unit is used for detecting the clearance change between the shafting and the sensors by adopting three displacement sensors.
And the axle center track determining unit is used for determining the axle center track according to the gap change.
The method comprehensively considers the stress of the steam turbine shafting and the change of the axle center track to predict the service life of the steam turbine, and improves the accuracy of service life prediction of the steam turbine. In addition, the invention adopts 3 displacement sensors to detect the change of the clearance between the shafting and the sensors, and further determines the axle center track according to the change of the clearance, thereby improving the accuracy of determining the axle center track and further improving the accuracy of predicting the service life of the steam turbine.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A method for predicting turbine life, the method comprising:
step S1: determining the stress distribution of a steam turbine shafting;
step S2: determining an axis track by using three displacement sensors;
step S3: determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axis track;
step S4: determining a total loss from the fatigue loss and the creep loss;
step S5: and predicting the service life of the steam turbine according to the total loss.
2. The method for predicting the service life of the steam turbine according to claim 1, wherein the determining the stress distribution of the steam turbine shafting specifically comprises:
step S11: defining a boundary condition;
step S12: determining a load parameter using finite element analysis software and the boundary condition;
step S13: calculating an average stress using the load parameters;
step S14: determining a stress concentration coefficient according to the material;
step S15: and determining the stress distribution of the steam turbine shafting according to the stress concentration coefficient and the average stress.
3. The method for predicting turbine life according to claim 1, wherein the determining the axial trajectory using three displacement sensors specifically comprises:
step S21: three displacement sensors are adopted to detect the change of the clearance between the shafting and the sensors;
step S22: and determining the axle center track according to the gap change.
4. The method of predicting turbine life according to claim 2, wherein said load parameters include pressure load, constraint load, rotational load, and temperature load.
5. The method of predicting turbine life according to claim 2, wherein said stress concentration factors include geometric stress concentration factors and temperature concentration factors.
6. A steam turbine life prediction system, the system comprising:
the stress distribution determining module is used for determining the stress distribution of the steam turbine shafting;
the axis track determining module is used for determining an axis track by using the three displacement sensors;
the loss determining module is used for determining fatigue loss and creep loss according to the stress distribution of the steam turbine shafting and the axle center track;
a total loss determination module for determining a total loss from the fatigue loss and the creep loss;
and the service life prediction module is used for predicting the service life of the steam turbine according to the total loss.
7. The steam turbine life prediction system of claim 6, wherein the stress distribution determination module specifically comprises:
a condition defining unit for defining a boundary condition;
a load parameter determination unit for determining a load parameter using finite element analysis software and the boundary condition;
a mean stress calculation unit for calculating a mean stress using the load parameter;
the stress concentration coefficient determining unit is used for determining a stress concentration coefficient according to the material;
and the stress distribution determining unit is used for determining the stress distribution of the steam turbine shafting according to the stress concentration coefficient and the average stress.
8. The steam turbine life prediction system of claim 6, wherein the axial trajectory determination module specifically comprises:
the clearance change determining unit is used for detecting the clearance change between the shafting and the sensors by adopting three displacement sensors;
and the axle center track determining unit is used for determining the axle center track according to the gap change.
9. The steam turbine life prediction system of claim 7, wherein the load parameters include pressure loads, constraint loads, rotational loads, and temperature loads.
10. The steam turbine life prediction system of claim 7, wherein the stress concentration factors comprise geometric stress concentration factors and temperature concentration factors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011321090.6A CN112594015A (en) | 2020-11-23 | 2020-11-23 | Steam turbine service life prediction method and system |
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| CN202011321090.6A CN112594015A (en) | 2020-11-23 | 2020-11-23 | Steam turbine service life prediction method and system |
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| CN112594015A true CN112594015A (en) | 2021-04-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3142019A1 (en) * | 2022-11-10 | 2024-05-17 | Safran Aircraft Engines | Process for designing and manufacturing an aeronautical part including a geometric accident |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3142019A1 (en) * | 2022-11-10 | 2024-05-17 | Safran Aircraft Engines | Process for designing and manufacturing an aeronautical part including a geometric accident |
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Application publication date: 20210402 |