CN109084829A - A kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method - Google Patents
A kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method Download PDFInfo
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Abstract
A kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method, the verification method is: a. is verified during running and calibration is: whether oxidation rate is abnormal synchronous with wall temperature overtemperature during operation, after combustion adjustment, wall temperature qualification；Whether corresponding oxidation rate is normal；B. site inspection is verified during overhauling and calibration is: checking scale spallation, plugging situation by means such as magnetic testing, endoscopies, whether verifying is consistent with oxidation rate monitoring result；C. oxide skin detection is verified during overhauling and calibration is: being analyzed by carrying out X-ray diffraction analysis, scanning electron microscope analysis, optical metallographic microscope to oxide skin sample, plugging pipe sample, oxide skin formation, growth and peel off mechanism and rule are verified, proposes oxide skin control measure；D. the verifying by step a, b, c and calibration oxidation rate monitoring model, it is incremental, it is final to realize the perfect of oxide skin control measures.
Description
Technical field
The present invention relates to a kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method,
Belong to overcritical thermal power generation unit high temperature scale Treatment process field.
Background technique
In recent years, than more prominent the problem of supercritical unit superheater material oxide skin, due to superheater, reheater material
The rapid, high volume of oxide skin generates, and when unit load generation big ups and downs, easily causes a large amount of peelings of oxide skin, causes plugging
Overtemperature and booster become the big security risk for influencing unit safety operation.Unit high-temperature oxydation rate lacks always can be
The means of line monitoring, data show that having carried out many in terms of high-temperature vapor is to the Oxidation Law of superheater material both at home and abroad grinds
Study carefully work, but be in the theoretical research of laboratory progress, oxide skin generating rate lacks monitoring means and data accumulation, oxidation
The growing principle and influence factor of skin lack testing and verification, can not be during unit is run to high-temperature surface high temperature scale wind
Danger zone domain is predicted and is judged, therefore cannot arrange targetedly to check in unit scheduled overhaul, can not carry out really
There are a large amount of peeling phenomenons of oxide skin during even starting after maintenance again in preventative maintenance work, many units, gently then
Cause overtemperature load down, it is heavy then cause to shut down.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, and high temperature scale shape can be verified by providing one kind
At, growth and peel off mechanism and rule, propose oxide skin control measure, eliminate oxide scale growth, peeling, plugging problem high temperature
The verifying of heating surface oxidation rate and calibration method.
The object of the present invention is achieved by the following technical solutions, a kind of overcritical thermal power generation unit high-temperature heating
The verifying of face oxidation rate and calibration method, the verification method is verified during including: high temperature scale operation and calibration, maintenance
Oxide skin detection verifying and calibration during period site inspection verifying and calibration, maintenance, therein to comprise the concrete steps that:
A. verify during running and calibration is: during operation, whether oxidation rate is abnormal synchronous with wall temperature overtemperature, is adjusted by operation
After whole, wall temperature is qualified；Whether corresponding oxidation rate is normal, if be not consistent, further calibrates oxidation rate monitoring model, follows
Sequence is progressive；
B. site inspection is verified during overhauling and calibration is: during maintenance, passing through the means inspection such as magnetic testing, endoscopy
Whether scale spallation, plugging situation, verifying are consistent with oxidation rate monitoring result, if be not consistent, further calibrate oxygen
Change rate monitoring model, it is incremental；
C. oxide skin detection is verified during overhauling and calibration is: by carrying out X-ray diffraction point to oxide skin sample, plugging pipe sample
Analysis, scanning electron microscope analysis, optical metallographic microscope analysis, the formation of verifying oxide skin, growth and peel off mechanism and rule, propose oxygen
Change skin control measure, eliminate oxide scale growth, peeling, plugging problem, guarantees unit safety operation；, whereas if there is also oxygen
Change skin growth, peel off, plugging problem, further verifying calibration oxidation rate monitoring model, incremental；
D. the verifying by step a, b, c and calibration oxidation rate monitoring model, it is incremental, it is final to realize that oxide skin improvement is arranged
That applies is perfect, promotes safe operation of the boiler.
As preferred: verifying and calibrate in the step a, during the operation is to verify the oxygen by wall temperature overtemperature
It is abnormal to change rate, the wall temperature overtemperature is verified by the oxidation rate extremely, the oxidation is verified by the wall temperature qualification
Rate is normal, passes through the qualification of wall temperature described in the oxidation rate normal authentication；When the wall temperature qualification, and the oxidation rate is different
Chang Shi calibrates oxidation rate monitoring model, when the wall temperature overtemperature, and when the oxidation rate is normal, calibration oxidation rate prison
Model is surveyed, it is incremental.
As preferred: in the step b), during the maintenance site inspection verifying and calibration be to boiler high temperature by
Hot face typical parts carry out the magnetic testing, endoscopy, verify the oxidation rate exception according to inspection result, if
It is not consistent, calibrates the oxidation rate monitoring model；It is normal according to the inspection result verifying oxidation rate, if be not consistent,
The oxidation rate monitoring model is calibrated, it is incremental.
As preferred: in the step c), oxide skin detection verifying and calibration are by oxidation during the maintenance
Skin sample, plugging pipe sample carry out the X-ray diffraction analysis, scanning electron microscope analysis, optical metallographic microscope and analyze, described in verifying
Oxide skin formation, growth and peel off mechanism and rule, propose the oxide skin control measure, eliminate oxide scale growth, peeling, block up
Pipe problem verifies safe operation of the boiler；, whereas if verifying the oxidation there is also oxide scale growth, peeling, plugging problem
Rate is abnormal, otherwise, calibrates the oxidation rate monitoring model, incremental.
The present invention aoxidizes during site inspection verifying and calibration, maintenance by verifying and calibrating during operation, during maintenance
Skin detection verifying and calibration calibrate high-temperature surface oxidation rate monitoring model and high temperature scale growth, peel off rule, circulation
Carry out, constantly improve.And then propose oxide skin control measure, eliminate oxide scale growth, peeling, plugging problem.
When the hydrogen gas production rate of real-time monitoring value and above-mentioned data model empirical value, which compare, deviation occurs, or actual measurement
Temperature spot and empirical value also synchronize when there is deviation, to these point there is deviation frequency count, according to statistical result
Carry out the prediction of high-temperature oxydation risk zones and early warning；Different phase after unit operation periodically or in real time carries out risk area
Scan statistics and judgement, it is periodically for statistical analysis to high risk area, according to statistic analysis result, predict and judge high-temperature oxydation
Skin peels off emphasis risk zones, and the high risk area in unit scheduled overhaul pair arranges emphasis inspection and preventative maintenance, synchronous
Low-risk area is also inspected by random samples, to examine and judge the accuracy rate of prediction.
Detailed description of the invention
Fig. 1 is high-temperature surface oxidation rate verifying of the present invention and calibration flow chart.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings: shown in Fig. 1, a kind of overcritical firepower of the present invention
The verifying of generating set high-temperature surface oxidation rate and calibration method, the verification method include: the high temperature scale runtime
Between verify and calibration, maintenance during site inspection verifying and calibration, maintenance during oxide skin detection verifying and calibration, tool therein
Body step is:
A. verify during running and calibration is: during operation, whether oxidation rate is abnormal synchronous with wall temperature overtemperature, is adjusted by operation
After whole, wall temperature is qualified；Whether corresponding oxidation rate is normal, if be not consistent, further calibrates oxidation rate monitoring model, follows
Sequence is progressive；
B. site inspection is verified during overhauling and calibration is: during maintenance, passing through the means inspection such as magnetic testing, endoscopy
Whether scale spallation, plugging situation, verifying are consistent with oxidation rate monitoring result, if be not consistent, further calibrate oxygen
Change rate monitoring model, it is incremental；
C. oxide skin detection is verified during overhauling and calibration is: by carrying out X-ray diffraction point to oxide skin sample, plugging pipe sample
Analysis, scanning electron microscope analysis, optical metallographic microscope analysis, the formation of verifying oxide skin, growth and peel off mechanism and rule, propose oxygen
Change skin control measure, eliminate oxide scale growth, peeling, plugging problem, guarantees unit safety operation；, whereas if there is also oxygen
Change skin growth, peel off, plugging problem, further verifying calibration oxidation rate monitoring model, incremental；
D. the verifying by step a, b, c and calibration oxidation rate monitoring model, it is incremental, it is final to realize that oxide skin improvement is arranged
That applies is perfect, promotes safe operation of the boiler.
Verifying and calibrate in step a of the present invention, during the operation is to verify the oxidation by wall temperature overtemperature
Rate is abnormal, verifies the wall temperature overtemperature extremely by the oxidation rate, verifies the oxidation speed by the wall temperature qualification
Rate is normal, passes through the qualification of wall temperature described in the oxidation rate normal authentication；When the wall temperature qualification, and the oxidation rate is abnormal
When, oxidation rate monitoring model is calibrated, when the wall temperature overtemperature, and when the oxidation rate is normal, calibration oxidation rate monitoring
Model, it is incremental.
In step b) of the present invention, site inspection verifying and calibration are to boiler high temperature heating surface during the maintenance
Typical parts carry out the magnetic testing, endoscopy, the oxidation rate exception are verified according to inspection result, if not phase
Symbol, calibrates the oxidation rate monitoring model；It is normal according to the inspection result verifying oxidation rate, if be not consistent, calibration
The oxidation rate monitoring model, it is incremental.
In step c) of the present invention, oxide skin detection verifying and calibration are by oxide skin sample during the maintenance
Product, plugging pipe sample carry out the X-ray diffraction analysis, scanning electron microscope analysis, optical metallographic microscope analysis, verify the oxidation
Skin formation, growth and peel off mechanism and rule, propose the oxide skin control measure, and elimination oxide scale growth, peeling, plugging are asked
Topic verifies safe operation of the boiler；, whereas if verifying the oxidation rate there is also oxide scale growth, peeling, plugging problem
It is abnormal, otherwise, the oxidation rate monitoring model is calibrated, it is incremental.
Claims (4)
1. a kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method, it is characterised in that: described
Verification method include: high temperature scale operation during verify and calibration, maintenance during site inspection verifying and calibration, turn(a)round
Between oxide skin detection verifying and calibration, it is therein to comprise the concrete steps that:
A. verify during running and calibration is: during operation, whether oxidation rate is abnormal synchronous with wall temperature overtemperature, is adjusted by operation
After whole, wall temperature is qualified；Whether corresponding oxidation rate is normal, if be not consistent, further calibrates oxidation rate monitoring model, follows
Sequence is progressive；
B. site inspection is verified during overhauling and calibration is: during maintenance, passing through the means inspection such as magnetic testing, endoscopy
Whether scale spallation, plugging situation, verifying are consistent with oxidation rate monitoring result, if be not consistent, further calibrate oxygen
Change rate monitoring model, it is incremental；
C. oxide skin detection is verified during overhauling and calibration is: by carrying out X-ray diffraction point to oxide skin sample, plugging pipe sample
Analysis, scanning electron microscope analysis, optical metallographic microscope analysis, the formation of verifying oxide skin, growth and peel off mechanism and rule, propose oxygen
Change skin control measure, eliminate oxide scale growth, peeling, plugging problem, guarantees unit safety operation；, whereas if there is also oxygen
Change skin growth, peel off, plugging problem, further verifies, calibrates oxidation rate monitoring model, it is incremental；
D. the verifying by step a, b, c and calibration oxidation rate monitoring model, it is incremental, it is final to realize that oxide skin improvement is arranged
That applies is perfect, promotes safe operation of the boiler.
2. overcritical thermal power generation unit high-temperature surface oxidation rate verifying according to claim 1 and calibration method,
It is characterized by:
Verifying and calibrate in the step a, during the operation is that the oxidation rate exception is verified by wall temperature overtemperature, is led to
It crosses the oxidation rate and verifies the wall temperature overtemperature extremely, it is normal by the wall temperature qualification verifying oxidation rate, pass through
Wall temperature described in the oxidation rate normal authentication is qualified；When the wall temperature qualification, and when the oxidation rate exception, calibration oxidation
Rate monitoring model calibrates oxidation rate monitoring model, in proper order gradually when the wall temperature overtemperature, and when the oxidation rate is normal
Into.
3. overcritical thermal power generation unit high-temperature surface oxidation rate verifying according to claim 1 and calibration method,
It is characterized by:
In the step b), during the maintenance site inspection verifying and calibration be to boiler high temperature heating surface typical parts into
The row magnetic testing, endoscopy verify the oxidation rate exception according to inspection result and calibrate institute if be not consistent
State oxidation rate monitoring model；It is normal according to the inspection result verifying oxidation rate, if be not consistent, calibrate the oxidation speed
Rate monitoring model, it is incremental.
4. overcritical thermal power generation unit high-temperature surface oxidation rate verifying according to claim 1 and calibration method,
It is characterized by:
In the step c), oxide skin detection verifying and calibration are by oxide skin sample, plugging pipe during the maintenance
Sample carries out the X-ray diffraction analysis, scanning electron microscope analysis, optical metallographic microscope analysis, verifies the oxide skin and is formed, is raw
Long and peel off mechanism and rule propose the oxide skin control measure, eliminate oxide scale growth, peeling, plugging problem, verify pot
Furnace safe operation；, whereas if the oxidation rate exception is verified there is also oxide scale growth, peeling, plugging problem, otherwise,
The oxidation rate monitoring model is calibrated, it is incremental.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810636221.6A CN109084829B (en) | 2018-06-20 | 2018-06-20 | Method for verifying and calibrating oxidation rate of high-temperature heating surface of supercritical thermal generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810636221.6A CN109084829B (en) | 2018-06-20 | 2018-06-20 | Method for verifying and calibrating oxidation rate of high-temperature heating surface of supercritical thermal generator set |
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| CN109084829A true CN109084829A (en) | 2018-12-25 |
| CN109084829B CN109084829B (en) | 2020-12-18 |
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