CN113434985A - State evaluation method for steam-water separator pipe seat and connecting pipe of supercritical or ultra-supercritical boiler - Google Patents

State evaluation method for steam-water separator pipe seat and connecting pipe of supercritical or ultra-supercritical boiler Download PDF

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CN113434985A
CN113434985A CN202110773535.2A CN202110773535A CN113434985A CN 113434985 A CN113434985 A CN 113434985A CN 202110773535 A CN202110773535 A CN 202110773535A CN 113434985 A CN113434985 A CN 113434985A
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supercritical
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CN113434985B (en
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王大鹏
杜保华
吴智群
黄廷辉
何新
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Xian Thermal Power Research Institute Co Ltd
Xian TPRI Power Station Information Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian TPRI Power Station Information Technology Co Ltd
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    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/14—Pipes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

A supercritical or ultra-supercritical boiler steam-water separator tube seat and connecting tube state assessment method comprises the following steps; 1) defining an evaluation object and basic information; 2) defining detailed evaluation points; 3) clearly evaluating the specific stage of the full operation life cycle of the object; 4) calculating a state factor; 5) calculating a correction factor; 6) preparing and implementing a metal inspection scheme; 7) obtaining a metal inspection result; 8) evaluating the dot state; 9) evaluating the state of an evaluation object; 10) and archiving and feeding back the evaluation result. The invention can help technical boilers or metal professionals in thermal power plants to make maintenance strategies better.

Description

State evaluation method for steam-water separator pipe seat and connecting pipe of supercritical or ultra-supercritical boiler
Technical Field
The invention belongs to the technical field of state evaluation of equipment of a thermal power plant, and particularly relates to a state evaluation method for a steam-water separator pipe seat and a connecting pipe of a supercritical or ultra-supercritical boiler.
Background
The steam-water separator of the supercritical or ultra-supercritical boiler is an important part of a boiler system of a thermal power plant, and in recent years, a large-scale high-parameter supercritical or ultra-supercritical thermal power generating unit frequently participates in peak shaving operation of a power grid, so that the steam-water separator of the supercritical or ultra-supercritical boiler is in a severe working condition in the operation process and is easily influenced by the action of heat exchange variable load. Particularly, the steam-water separator tube seat and the connecting tube area have larger stress concentration, the stress concentration is more obvious when the number of the connecting tubes is more, the welding seams at the tube seat are dense, and the structural state of the welding seams is deteriorated and the failure risk is increased by the embrittlement of the structures under the influence of high-temperature high-pressure variable load. In addition, because the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler are positioned outside the boiler, if the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler fail, a serious safety accident can be caused, and therefore, the states of the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler need to be accurately evaluated.
For supercritical or ultra-supercritical boiler steam-water separators, the stress analysis and stress distribution of transient thermosetting coupling of a steam inlet tangential miter structure of the steam-water separator based on ANSYS software are reported in documents, such as the stress analysis research of the steam inlet tangential miter structure at the steam-water separator starting stage, power station auxiliary machines 2013(2), the heat stress concentration close to the long axis of the elliptical hole of a connecting pipe is analyzed based on a finite element method, such as the finite element analysis of the internal pressure stress of the 600MW supercritical boiler steam-water separator, the boiler technology 2009(1), and the research on the cause of fillet weld cracks of an outer wall connecting pipe of the steam-water separator is also reported in documents, such as the research and treatment of fillet weld cracks of the outer wall connecting pipe of the medium-pressure steam-water separator, Guizhou chemical engineering 2012 (2). The state analysis or the service life evaluation of the steam-water separator pipe seat and the connecting pipe is only rarely reported. Stress analysis or service life evaluation is performed on a steam-water separator pipe seat and a connecting pipe, and the following conditions are required: the evaluation personnel is required to have abundant basic knowledge of mathematical analysis, basic knowledge of metal materials, mechanical calculation knowledge, life evaluation knowledge and experience; collecting complete design data and design data; collecting complete operation history data; complete and comprehensive metal inspection related data needs to be collected; constructing a stress field model and a temperature field model; comprehensive laboratory analysis data on samples of the same material are required as a reference group and the like. These complex conditions determine that the development of stress analysis, life loss calculation and other techniques is limited to professional technical organizations and personnel, and the collection, complete and comprehensive metal inspection and laboratory analysis of these basic data and data can lead to the increase of overhaul cost and labor cost of the power plant.
Therefore, a universal method is needed to be found, assessment personnel do not need to have abundant mathematical analysis basic knowledge, metal material basic knowledge, mechanics calculation knowledge, service life assessment knowledge and experience, extra test cost is not needed, and the state assessment can be performed on the supercritical or ultra-supercritical boiler steam-water separator pipe seat and the connecting pipe only by obtaining the existing metal inspection data, so that the technical personnel of the thermal power plant can be directly helped to make a maintenance strategy.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a state evaluation method for a steam-water separator tube seat and a connecting tube of a supercritical or ultra-supercritical boiler, which helps technical boilers or metal professionals in a thermal power plant to make a maintenance strategy better.
In order to achieve the purpose, the technical scheme adopted by the invention and the beneficial effects of the invention are as follows:
a supercritical or ultra-supercritical boiler steam-water separator tube seat and connecting tube state assessment method comprises the following steps;
1) defining an evaluation object and basic information;
2) defining detailed evaluation points;
3) clearly evaluating the specific stage of the full operation life cycle of the object;
4) calculating a state factor CS；
5) Calculating a correction factor CC；
6) Preparing and implementing a metal inspection scheme;
7) obtaining a metal inspection result;
8) evaluating the dot state;
9) evaluating the state of an evaluation object;
10) and archiving and feeding back the evaluation result.
The evaluation objects in the step 1) are a supercritical or ultra-supercritical boiler steam-water separator tube seat and a connecting tube, and the basic information comprises a design drawing, a design diameter, a design wall thickness, a design material and a latest overhaul record file;
the step 2) comprises the following specific operation steps:
comprehensively considering the maintenance plan, time, cost and maintenance results of previous times, pointedly determining evaluation points, and dividing the evaluation points into two types: the adapter and socket are distinguished by the following corner marks nc and ts, respectively.
The specific operation steps of the step 3) are as follows:
clearly evaluating which of the early, mid, end and final stages of the full operational life cycle the subject is in;
each stage of the full operating life cycle Time ranges of the stages of the full operational life cycle
Early stage (0,0.1Lc]
Middle stage (0.1Lc,0.6Lc]
End stage (0.6Lc,0.85Lc]
End stage (0.85Lc,Lc]
Wherein L iscFor a design life, it is generally defined as the design life of the unit of 30 years.
The specific operation steps of calculating the state factor in the step 4) are as follows:
determining a corresponding state factor C based on the full operation life cycle stage of the clear evaluation object in the step 3)S；
Each stage of the full operating life cycle State factor CS
Early stage 1+s
Middle stage 1
End stage 1+2s
End stage 1+5s
Wherein the value of s is looked up according to the following table based on the design and manufacturing data collected in step 1).
Figure BDA0003153363710000041
Figure BDA0003153363710000051
The specific operation steps of calculating the correction factor in the step 5) are as follows:
determining a correction factor C according to equation (1) based on feedback of the last evaluation result of the evaluation objectC；
Figure BDA0003153363710000052
In the formula, the values of the parameters δ and c are found in the following table.
Figure BDA0003153363710000053
The step 6) comprises the following specific operation steps:
comprehensively considering the maintenance plan, time, cost and maintenance results of previous times, selecting proper items from the macroscopic inspection, the surface flaw detection, the nondestructive inspection, the metallographic inspection, the pipe diameter inspection, the wall thickness measurement, the hardness inspection and the scale thickness measurement according to the evaluation points determined in the step 2), making a metal inspection scheme and implementing the scheme.
The specific operation steps of the step 7) are as follows:
obtaining all metal inspection results of the evaluation points according to the metal inspection items determined in the step 6), dividing the state parameters into three categories according to the metal inspection results, and confirming the state parameters CP and the weight Q corresponding to all the metal inspection items of the evaluation points.
Figure BDA0003153363710000054
Figure BDA0003153363710000061
The step 8) comprises the following specific operation steps:
performing state evaluation on the single evaluation point according to the metal inspection result obtained in the step 7), and defining the state of the single evaluation point as CkThe evaluation model is shown as formula (2);
Figure BDA0003153363710000062
state C of evaluation pointkThe value of (A) normally falls within [0,4 ]]In the interval range, CkThe state of the evaluation point becomes worse and worse when the value of (2) is changed from 0 to 4.
Weight Q of the three types of state parameters in the formula (2)Ii、QIIiAnd QIIIiGiving the rule of formula (3);
Figure BDA0003153363710000071
the specific operation steps in the step 9) are as follows:
counting all the evaluation points obtained in the step 8) according to the classification of the connecting pipe and the pipe seat (the lower corner marks are nc and ts respectively), counting the number m of the connecting pipe evaluation points and the number n of the pipe seat evaluation points, and then carrying out overall evaluation on an evaluation object, wherein an evaluation model of a final state value is shown as a formula (12);
Figure BDA0003153363710000072
if the C value of the state of the evaluation object is 0, the state of the evaluation object is considered to be optimal, and when the C value changes from 0 to 4, the state of the evaluation object gradually becomes worse; when the C value is more than 2.5, the state of an evaluation object is general, but the state of a part of evaluation points is poor, so that technicians pay attention to the evaluation object, and the part of evaluation points are maintained or replaced in time; when the C value is greater than 3.2, the state of the evaluation object is poor, and the state of most evaluation points is poor. If the individual evaluation point is in a poor state, the individual evaluation point may be replaced. If the overall state of the evaluation object is poor, particularly at the end stage and the final stage of the full operation life cycle, the enterprise should be ready for overall replacement of the evaluation object.
The specific operation steps in the step 10) are as follows:
and completely recording and archiving the state evaluation result of the evaluation object obtained in the step 9), and feeding back the state evaluation result for the next evaluation to calculate the correction factor in the step 5).
The first type state parameters in the step 8): macroscopic State parameter CPI1-kResult R from macroscopic examinationI1-k: { no defect found, a few suspected defects found, invention defect evident } definition, as shown in equation (4):
Figure BDA0003153363710000081
the first type state parameters in the step 8): surface state parameter CPI2-kResults of surface inspection RI2-k: { no defect found, surface defect found but eliminated after sanding, surface defect found but still present after sanding } is defined as shown in equation (5):
Figure BDA0003153363710000082
the second type state parameters in the step 8): lossless State parameter CPII1-kFrom results R of non-destructive inspectionII1-k: { stage I, stage II, stage III, stage IV } definition, as shown in equation (6):
Figure BDA0003153363710000083
the second type state parameters in the step 8): tissue state parameter CPII2-kResults of metallographic examination RII2-k: { level 1, level 2, level 3, level 4, level 5 } definition, as shown in equation (7):
Figure BDA0003153363710000091
the third type state parameter in the step 8): pipe diameter state parameter CPIII1-kFrom the result R of the tube diameter inspectionIII1-kAs defined by formula (8):
Figure BDA0003153363710000092
in the formula (8), D0The design pipe diameter is in mm; e is the limit creep expansion rate, and the unit is percent, for the steam-water separator connecting pipe, the values of the limit creep expansion rate are shown in the following table:
material of Alloy steel Carbon steel
Value of e 2.5％ 3.5％
The steps are8) Middle and third type state parameters: wall thickness State parameter CPIII2-kResults R from wall thickness inspectionIII2-kAs defined by formula (9):
Figure BDA0003153363710000093
in the formula (9), d0For design wall thickness, in mm;
the third type state parameter in the step 8): hardness State parameter CPIII3-kResults of hardness test RIII3-kDefinition, as shown in formula (10):
Figure BDA0003153363710000101
the hardness in the formula (10) is Brinell hardness, HBLAnd HBHRespectively the minimum value and the maximum value of ultimate hardness, and for the connecting pipe of the steam-water separator, the HB of common materialLAnd HBHValues are summarized in the following table:
material of T22 T23 G102 T91 12C1MoV …
HBL 120 150 150 180 135 …
HBH 163 220 220 250 179 …
The third type state parameter in the step 8): scale skin state parameter CPIII4-kResults of inspection of inner wall scale RIII4-kAs defined by formula (11):
Figure BDA0003153363710000102
in formula (11), XHThe maximum allowable thickness of the inner wall oxide scale is in mm. For the steam-water separator connecting pipe, X made of common materialsHThe values are summarized in the following table:
material of T22 T23 G102 T91 12C1MoV …
XH 0.30 0.30 0.45 0.30 0.35 …
The invention has the beneficial effects that:
the invention does not need evaluators to have abundant basic knowledge, mechanics calculation knowledge, service life evaluation knowledge and experience of metal materials, and extra test cost, and is based on conventional metal inspection data of macroscopic inspection, surface flaw detection, nondestructive flaw detection, metallographic inspection, pipe diameter inspection, wall thickness measurement, hardness inspection and oxide skin thickness measurement of supercritical or ultra-supercritical boiler steam-water separator pipe seats and connecting pipes, through the correction of state factors and correction factors, the state evaluation is carried out on the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler, thereby directly helping the technical personnel of the thermal power plant to make the next maintenance strategy, if the states of the respective positions of the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler are poor, the objects can be replaced independently, and if the overall state is poor, the enterprise should be ready for overall replacement of the evaluation objects.
Taking the results of the pipe seat and the connecting pipe of the steam-water separator on the left side of a 660MW supercritical boiler repaired at 12 months C in 2020 as an example, the state evaluation is carried out according to the method of the invention, and the evaluation process and the final results are shown as follows.
Figure BDA0003153363710000111
Figure BDA0003153363710000121
Figure BDA0003153363710000122
Drawings
FIG. 1 is a schematic diagram of a state estimation process according to the present invention.
Detailed Description
The invention is further described in the following with reference to the accompanying drawings and examples.
As shown in fig. 1:
1) specifying evaluation target and basic information
Firstly, the objects to be clearly evaluated are the connecting pipe and the pipe seat of the steam-water separator of the supercritical or ultra-supercritical boiler.
In addition, it is necessary to collect and specify the design drawing, design diameter, design wall thickness, design material, and last repair record file of the evaluation target.
2) Unambiguous detailed evaluation points
In order to know the actual state of an evaluation object in detail, it is generally proposed to select multiple positions (take-over and tube seat) for the evaluation object to be examined, which are also called evaluation points since they ultimately participate in the state evaluation. And the evaluation points are divided into two categories: the adapter and socket are distinguished by the following corner marks nc and ts, respectively.
3) Specific stage of full operation life cycle of definite evaluation object
The state of the evaluation object has a certain relation with the specific stage of the full operation life cycle, and the state is not good due to design and manufacturing defects and hidden danger left by installation at the early stage of the full operation life cycle. With the stable operation of the unit, the middle stage of the full operation life cycle is entered, and the evaluation object reaches the optimal state and can last for a long time. When the end stage of the full-operation life cycle is entered, the state of the evaluation object is gradually deteriorated under the influence of the long-term peak shaving operation of the unit. When the final stage of the full operation life cycle is entered, the material is aged gradually and quickly under the high-temperature and high-pressure service condition for a long time, and the state of an evaluation object is degraded rapidly.
Clearly evaluating which of the early, mid, end and final stages of the full operational life cycle the subject is in;
each stage of the full operating life cycle Time ranges of the stages of the full operational life cycle
Early stage (0,0.1Lc]
Middle stage (0.1Lc,0.6Lc]
End stage (0.6Lc,0.85Lc]
End stage (0.85Lc,Lc]
Wherein L iscFor a design life, it is generally defined as the design life of the unit of 30 years.
4) Calculating the cause of a stateSeed CS
Determining the corresponding state factor C based on 3) the stage of the clear evaluation objectS；
Each stage of the full operating life cycle State factor CS
Early stage 1+s
Middle stage 1
End stage 1+2s
End stage 1+5s
Wherein the value of s is looked up according to the following table based on the design and manufacturing data collected in 1).
Figure BDA0003153363710000141
If all indexes in the design and manufacturing data are normal and no major problems are found, the value of c is 0.01, otherwise, the evaluation personnel can adjust according to the problems found in the design and manufacturing stages and the actual conditions of the components.
5) Calculating a correction factor CC
Based on the feedback of the last evaluation result of the evaluation object, the evaluation is performed according to the formula (1)Fixed correction factor CC；
Figure BDA0003153363710000142
In the formula, the values of the parameters δ and c are found in the following table.
Figure BDA0003153363710000151
6) Making metal testing plan and implementing
Comprehensively considering the maintenance plan, time, cost and maintenance results of previous times, selecting proper items from the macroscopic inspection, the surface flaw detection, the nondestructive inspection, the metallographic inspection, the pipe diameter inspection, the wall thickness measurement, the hardness inspection and the scale thickness measurement according to the evaluation points determined in the step 2), making a metal inspection scheme and implementing the scheme.
Figure BDA0003153363710000152
7) Obtaining a metal test result
Obtaining all metal inspection results of the evaluation points according to the metal inspection items determined in the step 6), dividing the state parameters into three categories according to the metal inspection results, and confirming the state parameters CP and the weight Q corresponding to all the metal inspection items of the evaluation points.
Figure BDA0003153363710000161
8) Evaluation point state evaluation
Performing state evaluation on the single evaluation point according to the metal inspection result obtained in the step 7), wherein the state of the single evaluation point is defined as CkThe evaluation model is shown in formula (2).
Figure BDA0003153363710000171
State C of evaluation pointkThe value of (A) normally falls within [0,4 ]]In the interval range, CkThe state of the evaluation point becomes worse and worse when the value of (2) is changed from 0 to 4.
Comprehensively considering the importance of various metal inspection items and the implementation frequency, result accuracy and other factors, and weighting Q for the three types of state parameters in the formula (2)Ii、QIIiAnd QIIIiGiving the rule of formula (3);
Figure BDA0003153363710000172
the evaluation methods of three types of state parameters of a single evaluation point are given below.
8.1) evaluation of the first-type State parameters
8.1.1) evaluation of the macroscopic State parameters corresponding to the macroscopic examination
Result of macroscopic examination RI1-kTypically one of the sets { no defect found, out-of-standard defect } corresponding to the macro state parameter CPI1-kIs as defined in formula (4).
Figure BDA0003153363710000173
8.1.2) evaluation of surface State parameters corresponding to surface inspection
Result of surface inspection RI2-kGenerally { no defect found, surface defect found but eliminated after polishing, surface defect found but still present after polishing }, corresponding to surface condition parameter CP }I2-kIs as defined in formula (5).
Figure BDA0003153363710000181
8.2) evaluation of the second type of State parameters
8.2.1) non-destructive State parameter evaluation corresponding to non-destructive inspection
The nondestructive inspection items can be classified into ultrasonic, magnetic powder, penetration and ray detection, and the result R of nondestructive inspectionII1-kGenerally defined as { I level, II level, III level and IV level }, if a plurality of nondestructive inspection projects are implemented, the nondestructive inspection result with the highest grade is selected as the nondestructive inspection result, and the corresponding nondestructive state parameter CP is selectedII1-kIs as defined in formula (6).
Figure BDA0003153363710000182
8.2.2) evaluation of nondestructive State parameters corresponding to metallographic examination
Result of metallographic examination RII2-kGenerally defined as { level 1, level 2, level 3, level 4, level 5 }, and its corresponding organization state parameter CPII2-kIs as defined in formula (7).
Figure BDA0003153363710000183
8.3) evaluation of the third State parameters
8.3.1) evaluation of wall thickness state parameters corresponding to the tube diameter inspection
The evaluation object gradually generates outer diameter creep expansion when running under high temperature condition, and the creep expansion is easy to cause failure when severe.
Result R of pipe diameter inspectionIII1-kCorresponding pipe diameter state parameter CPIII1-kIs as defined in formula (8).
Figure BDA0003153363710000191
In the formula (8), D0The design pipe diameter is in mm; e is the limit creep expansion rate, and the unit is percent, and the values of the limit creep expansion rate for the steam-water separator connecting pipe are shown in the following table.
Material of Alloy steel Carbon steel
Value of e 2.5％ 3.5％
8.3.2) evaluation of the wall thickness State parameters corresponding to the wall thickness check
The inner wall of the evaluation object can generate high-temperature oxidation under the erosion and corrosion action of high-temperature steam, and the base metal of the evaluation object is gradually consumed, so that the wall thickness is reduced, and the evaluation object has a worse state.
Results of wall thickness inspection RIII2-kCorresponding wall thickness state parameter CPIII2-kIs as defined in formula (9).
Figure BDA0003153363710000201
In the formula (9), d0For design wall thickness, units are mm.
8.3.3) evaluation of the hardness State parameters corresponding to the hardness test
The evaluation object gradually aged under high temperature conditions, and the hardness gradually decreased, the state deteriorated, and finally failure may occur.
Results of hardness test RIII3-kCorresponding hardness state parameter CPIII3-kIs as defined in formula (10).
Figure BDA0003153363710000202
The hardness in the formula (10) is Brinell hardness, HBLAnd HBHRespectively minimum ultimate hardness andmaximum limit hardness, for the connecting pipe of the steam-water separator, HB of common materialLAnd HBHValues are summarized in the following table:
material of T22 T23 G102 T91 12C1MoV …
HBL 120 150 150 180 135 …
HBH 163 220 220 250 179 …
8.3.4) evaluation of the corresponding scale state parameters for the inspection of the inner wall scale
The inner wall of the evaluation object can generate high-temperature oxidation under the erosion and corrosion action of high-temperature steam, and the formed inner wall oxidation layer increases heat transfer resistance, so that the actual use temperature of the evaluation object is increased, and the material aging is accelerated.
Results of inspection of inner wall scale RIII4-kCorresponding scale state parameter CPIII4-kIs as defined in formula (11).
Figure BDA0003153363710000211
Formula (11), XHThe maximum allowable thickness of the inner wall oxide scale is in mm. For the steam-water separator connecting pipe, X made of common materialsHThe values are summarized in the following table:
material of T22 T23 G102 T91 12C1MoV …
XH 0.30 0.30 0.45 0.30 0.35 …
9) Evaluation object state evaluation
And (4) counting all the evaluation points obtained in the step (8) according to the classification of the connecting pipe and the pipe seat (the lower corner marks are nc and ts respectively), counting the number m of the connecting pipe evaluation points and the number n of the pipe seat evaluation points, and then carrying out overall evaluation on the evaluation object, wherein the evaluation model of the final state value is shown as a formula (12).
Figure BDA0003153363710000212
If the C value of the state of the evaluation object is 0, the state of the evaluation object is considered to be optimal, and when the C value changes from 0 to 4, the state of the evaluation object gradually becomes worse; when the C value is more than 2.5, the state of an evaluation object is general, but the state of a part of evaluation points is poor, so that technicians pay attention to the evaluation object, and the part of evaluation points are maintained or replaced in time; when the C value is greater than 3.2, the state of the evaluation object is poor, and the state of most evaluation points is poor. If the individual evaluation point is in a poor state, the individual evaluation point may be replaced. If the overall state of the evaluation object is poor, particularly at the end stage and the final stage of the full operation life cycle, the enterprise should be ready for overall replacement of the evaluation object.
10) Assessment result archiving and feedback
And completely recording and archiving the state evaluation result of the evaluation object obtained in the step 9), and feeding back the state evaluation result for the next evaluation to calculate the correction factor in the step 5).
The states of the supercritical or ultra-supercritical boiler steam-water separator tube seat and the connecting tube are obtained by adopting the technical scheme, so that the thermal power plant technical personnel can be helped to know the actual states of the supercritical or ultra-supercritical boiler steam-water separator tube seat and the connecting tube, the state change trend of the supercritical or ultra-supercritical boiler steam-water separator tube seat and the connecting tube can be predicted by aiming at the state evaluation results of the same evaluation point for multiple times, the state results of all the evaluation points can be integrated to evaluate the overall states of the supercritical or ultra-supercritical boiler steam-water separator tube seat and the connecting tube, and the method has important significance for establishing a maintenance plan and a replacement strategy.

Claims (10)

1. A supercritical or ultra-supercritical boiler steam-water separator tube seat and connecting tube state assessment method is characterized by comprising the following steps;
1) defining an evaluation object and basic information;
2) defining detailed evaluation points;
3) clearly evaluating the specific stage of the full operation life cycle of the object;
4) calculating a state factor CS；
5) Calculating a correction factor CC；
6) Preparing and implementing a metal inspection scheme;
7) obtaining a metal inspection result;
8) evaluating the dot state;
9) evaluating the state of an evaluation object;
10) and archiving and feeding back the evaluation result.
2. The method for evaluating the states of the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler according to claim 1, wherein the evaluation objects in the step 1) are the steam-water separator tube seat and the connecting tube of the supercritical or ultra-supercritical boiler, and the basic information comprises a design drawing, a design diameter, a design wall thickness, a design material and a last repair record file.
3. The method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 2) comprises the following specific operation steps:
all evaluation points of the evaluation object are specified and divided into: take over evaluation points, tube base evaluation points, distinguished by the following corner marks nc and ts, respectively.
4. The method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 3) comprises the following specific operation steps:
clearly evaluating which of the early, mid, end and final stages of the full operational life cycle the subject is in;
each stage of the full operating life cycle Time ranges of the stages of the full operational life cycle Early stage (0,0.1Lc] Middle stage (0.1Lc,0.6Lc] End stage (0.6Lc,0.85Lc] End stage (0.85Lc,Lc]
Wherein L iscFor a design life, it is generally defined as the design life of the unit of 30 years.
5. The method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the specific operation steps in the step 4) are as follows:
determining the corresponding state factor C based on the stage of the definite evaluation object in the step 3)S；
Each stage of the full operating life cycle State factor CS Early stage 1+s Middle stage 1 End stage 1+2s End stage 1+5s
Wherein, according to the design and manufacturing data collected in the step 1), the value of s is searched according to the following table;
Figure FDA0003153363700000031
6. the method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 5) comprises the following specific operation steps:
determining a correction factor C according to equation (1) based on feedback of the last evaluation result of the evaluation objectC；
Figure FDA0003153363700000032
In the formula, the values of the parameters δ and c are found in the following table.
Figure FDA0003153363700000033
7. The method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 6) comprises the following specific operation steps:
comprehensively considering the maintenance plan, time, cost and maintenance results of previous times, selecting proper items from the macroscopic inspection, the surface flaw detection, the nondestructive inspection, the metallographic inspection, the pipe diameter inspection, the wall thickness measurement, the hardness inspection and the scale thickness measurement according to the evaluation points determined in the step 2), making a metal inspection scheme and implementing the scheme.
8. The method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 7) comprises the following specific operation steps:
acquiring all metal inspection results of the evaluation points according to the metal inspection items determined in the step 6), dividing the state parameters into three categories according to the metal inspection results, and confirming the state parameters CP and the weight Q corresponding to all the metal inspection items of the evaluation points;
Figure FDA0003153363700000041
Figure FDA0003153363700000051
9. the method for evaluating the state of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 8) comprises the following specific operation steps:
performing state evaluation on the single evaluation point according to the metal inspection result obtained in the step 7), and defining the state of the single evaluation point as CkThe evaluation model is shown as formula (2);
if Max(CPIi-k，CPIIi-k，CPIIIi-k)≠1
Figure FDA0003153363700000052
else
Ck＝Max(CPIi-k，CPIIi-k，CPIIIi-k)×4
state C of evaluation pointkThe value of (A) normally falls within [0,4 ]]Within the interval, when CkWhen the value of (a) is changed from 0 to 4, the state of the evaluation point becomes worse and worse;
weight Q of the three types of state parameters in the formula (2)Ii、QIIiAnd QIIIiGiving the rule of formula (3);
Figure FDA0003153363700000053
the first type state parameters in the step 8): macroscopic State parameter CPI1-kResult R from macroscopic examinationI1-k: { no defect found, a few suspected defects found, invention defect evident } definition, as shown in equation (4):
Figure FDA0003153363700000061
the first type state parameters in the step 8): surface state parameter CPI2-kResults of surface inspection RI2-k: { no defect found, surface defect found but eliminated after sanding, surface defect found but still present after sanding } is defined as shown in equation (5):
Figure FDA0003153363700000062
the second type state parameters in the step 8): lossless State parameter CPII1-kFrom results R of non-destructive inspectionII1-k: { stage I, stage II, stage III, stage IV } definition, as shown in equation (6):
Figure FDA0003153363700000063
the second type state parameters in the step 8): tissue state parameter CPII2-kResults of metallographic examination RII2-k: { level 1, level 2, level 3, level 4, level 5 } definition, as shown in equation (7):
Figure FDA0003153363700000064
the third type state parameter in the step 8): pipe diameter state parameter CPIII1-kFrom the result R of the tube diameter inspectionIII1-kAs defined by formula (8):
Figure FDA0003153363700000071
in the formula (8), D0The design pipe diameter is in mm; e is the ultimate creep expansion in%.
The third type state parameter in the step 8): wall thickness State parameter CPIII2-kResults R from wall thickness inspectionIII2-kAs defined by formula (9):
Figure FDA0003153363700000072
in the formula (9), d0For design wall thickness, units are mm.
The third type state parameter in the step 8): hardness State parameter CPIII3-kResults of hardness test RIII3-kDefinition, as shown in formula (10):
Figure FDA0003153363700000073
in the formula (10), HBLAnd HBHThe minimum and maximum ultimate hardness values are respectively.
The third type state parameter in the step 8): scale skin state parameter CPIII4-kResults of inspection of inner wall scale RIII4-kAs defined by formula (11):
Figure FDA0003153363700000081
formula (11), XHThe maximum allowable thickness of the inner wall oxide scale is in mm.
10. The method for evaluating the states of the steam-water separator pipe seat and the connecting pipe of the supercritical or ultra-supercritical boiler according to claim 1, wherein the specific operation steps in the step 9) are as follows:
counting all the evaluation points obtained in the step 8) according to the classification of the connecting pipe and the pipe seat (the lower corner marks are nc and ts respectively), counting the number m of the connecting pipe evaluation points and the number n of the pipe seat evaluation points, and then carrying out overall evaluation on the evaluation object, wherein the evaluation model of the final state value is shown as a formula (12).
Figure FDA0003153363700000082
If the C value of the state of the evaluation object is 0, the state of the evaluation object is considered to be optimal, and when the C value changes from 0 to 4, the state of the evaluation object gradually becomes worse; when the C value is more than 2.5, the state of an evaluation object is general, but the state of a part of evaluation points is poor, so that technicians pay attention to the evaluation object, and the part of evaluation points are maintained or replaced in time; when the C value is greater than 3.2, the state of the evaluation object is poor, and the state of most evaluation points is poor. If the individual evaluation point is in a poor state, the individual evaluation point may be replaced. If the overall state of the evaluation object is poor, particularly at the end stage and the final stage of the full-operation life cycle, the enterprise needs to make preparations for overall replacement of the evaluation object;
the specific operation steps in the step 10) are as follows:
and completely recording and archiving the state evaluation result of the evaluation object obtained in the step 9), and feeding back the state evaluation result for the next evaluation to calculate the correction factor in the step 5).
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