CN102749038A - Assessment method of growing status of austenitic steel steam oxide skin - Google Patents
Assessment method of growing status of austenitic steel steam oxide skin Download PDFInfo
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- CN102749038A CN102749038A CN2011101001741A CN201110100174A CN102749038A CN 102749038 A CN102749038 A CN 102749038A CN 2011101001741 A CN2011101001741 A CN 2011101001741A CN 201110100174 A CN201110100174 A CN 201110100174A CN 102749038 A CN102749038 A CN 102749038A
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Abstract
The invention provides an assessment method of the growing status of austenitic steel steam oxide skin, which is applied to a high-temperature heated surface of a power station boiler and comprises the following steps: establishing a growth model of the austenitic steel steam oxide skin; collecting the medium and temperature conditions of the austenitic steel steam oxide skin of a pipe sample; overhauling the pipe cutting pipe sample by a machine set so as to carry out end surface micro probe analysis (thickness, hierarchical structure, hole rate, element distribution, and the like); converting the micro probe analysis into a plurality of qualitative and quantitative indicators; carrying out assessment on the growing status and the peeling trend of steam oxide skin of the austenitic steel furnace pipe sample; and putting forward suggestions in operation and overhaul. The assessment method of the growing status of austenitic steel steam oxide skin applied to the high-temperature surface of the power station boiler carries out the assessment on the growing status of the steam oxide skin of the high-temperature furnace pipe of the power station boiler so as to analyze the peeling risk of the high-temperature furnace pipe steam oxide skin and further provide the basis for boiler operation and overhaul, thereby improving the safety and economical performance of boiler operation.
Description
Technical field
The present invention relates to station boiler tubulose attitude assessment technology field, and be particularly related to a kind of appraisal procedure that is applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions.
Background technology
At present ultra (surpassing) critical unit high-temperature surface generally adopts austenitic steel; This kind material is peeled off the plugging, the booster fault that cause because of high-temperature steam oxide skin and is happened occasionally, and becomes one of the safety of ultra (surpassing) the critical unit of present threat, key factor of stable operation.Boiler heating surface steam interface is actual to be an iron/water (vapour)/O
2Deng reaction interface, and form a oxide film (skin) rapidly with protectiveness.The design feature of oxide film, closely related with material, temperature of reaction, steam characteristics.
Fig. 1 a and Fig. 1 b are depicted as the end face characteristic of typical oxide film, although structurally there are some differences, can divide into double-layer structure, i.e. epitaxial loayer and Nei Sheng layer.Fig. 1 a is depicted as the fine and close Fe of existing steel surface 10
3O
4The porosity and looseness Fe of layer 30 and initial steel surface 20
3O
4Layer 40; Fig. 1 b is depicted as internal layer and layer structure, and wherein internal layer comprises Fe
3O
4+ FeCr
2O
4Layer 200, skin comprises Fe
3O
4Layer 300 and Fe
2O
3Layer 400 comprises between internal layer and the skin that initial surface opened in 100 minutes.Fig. 2 a～Fig. 2 d is the basic structure synoptic diagram of the interval heating surface oxide film of different temperatures, and the basic structure characteristic of the interval heating surface oxide film of different temperatures, temperature are higher, and the oxide film surface microstructure is finer and close, and the surface is smooth more.
The main method of estimating station boiler " four pipes " (economizer, water-cooling wall, superheater, reheater) clean-up performance at present is to utilize maintenance to carry out the pipe cutting inspection, mainly is to carry out dirt amount and scale sample ingredient test.Pipe appearance is carried out cleanup acid treatment obtain dirt amount and dirt appearance, and dirt amount and surface corrosion situation are carried out qualitative classification, obtain the dirt amount through pipe appearance weight difference before and after the pickling.What of boiler tube dirt amount traditional dirt amount and component analyzing method can only estimate, and can't carry out the sedimental status monitoring of boiler tube; For estimating high-temperature steam oxide skin; Its limitation is to characterize the growth conditions of high-temperature steam oxide skin and peels off trend; Can not foundation be provided for boiler maintenance and operation; Often make peeling off of high-temperature steam oxide skin become passive accident, cause the security of unit operation and economy to reduce greatly.And the appraisal procedure of a kind of boiler tube high-temperature steam oxide skin growth conditions that the present invention proposes is a kind of new boiler tube status monitoring pattern, and the discovery of hidden danger and improvement are done sth. in advance greatly, can improve the monitoring level of ultra (surpassing) critical unit.
Rule is peeled off in the growth of grasping the high-temperature steam oxide skin of austenitic steel, and the growth conditions assessment technology of exploitation high temperature furnace pipe steam oxidation skin is particularly important for the prevention and control and the improvement of high temperature furnace pipe steam oxidation skin.
Summary of the invention
The present invention proposes a kind of appraisal procedure that is applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions; Growth conditions to station boiler high temperature furnace pipe steam oxidation skin is assessed; And then high temperature furnace pipe steam oxidation skin peeled off risk analysis; For boiler operatiopn and maintenance provide foundation, improve the security and the economy of boiler operatiopn.
In order to achieve the above object, the present invention proposes a kind of appraisal procedure of austenitic steel steam oxidation skin growth conditions, is applicable to the station boiler high-temperature surface, comprises the following steps:
Set up the growth model of austenitic steel high-temperature steam oxide skin;
Collection tube appearance steam oxidation skin medium of living in, temperature conditions;
Unit maintenance pipe cutting pipe appearance is carried out the end face micro-zone analysis;
Micro-zone analysis is converted into a plurality of qualitative and quantitative index;
Austenitic steel boiler tube pipe appearance steam oxidation skin growth conditions and the trend of peeling off are estimated, and proposed the suggestion in operation and the maintenance.
Further, the growth model of said austenitic steel high-temperature steam oxide skin is divided into four-stage with boiler high temperature heating surface austenitic steel steam oxidation skin growth conditions: 1) oxide skin thickens; 2) produce the cavity in the middle of the oxide skin; 3) intermediate void runs through and causes layering; 4) peel off between the oxide skin ectonexine.
Further, said unit maintenance pipe cutting pipe appearance is analyzed adopts field emission scanning electron microscope to carry out microcell high-resolution two dimension morphology observation and dimension is accurately measured, and uses X-ray energy spectrometer that regional area is carried out the microcell component analysis.
Further, putting in order layer thickness when oxide skin is 30～50 μ m, and the oxide skin outer layer thickness is 15～25 μ m; Layer thickness is 15～25 μ m in the oxide skin; When obvious layering does not appear in simultaneous oxidation skin hierarchy, judge that oxide skin is in good condition, note the control overtemperature in the equipment operation.
Further, putting in order layer thickness when oxide skin is 50～70 μ m, and the oxide skin outer layer thickness is 25～35 μ m; Layer thickness is 25～35 μ m in the oxide skin; When the appearance of simultaneous oxidation skin hierarchy was empty in a large number, judgement oxide skin was peeled off trend, avoids the fluctuation of loading in the equipment operation; Inspection is strengthened in the operation of strict control start and stop in the maintenance.
Further, putting in order layer thickness when oxide skin is 70～100 μ m, and the oxide skin outer layer thickness is 30～50 μ m; Layer thickness is 30～50 μ m in the oxide skin; The cavity appears in simultaneous oxidation skin hierarchy when running through, and judges that oxide skin is about to peel off, and strengthens the inspection cleaning in the suggestion maintenance; Initiatively disturbance is peeled off it, and in maintenance, clears up.
Further, saidly unit maintenance pipe cutting pipe appearance is carried out the end face micro-zone analysis comprise and carry out the micro-zone analysis that thickness, hierarchy, hole ratio, element distribute.
The appraisal procedure that is applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions that the present invention proposes; Can assess the growth conditions of station boiler high temperature furnace pipe steam oxidation skin; And then high temperature furnace pipe steam oxidation skin peeled off risk analysis; For boiler operatiopn and maintenance provide foundation, improve the security and the economy of boiler operatiopn.
Description of drawings
Fig. 1 a and Fig. 1 b are depicted as the end face characteristic synoptic diagram of typical oxide film.
Fig. 2 a～Fig. 2 d is the basic structure synoptic diagram of the interval heating surface oxide film of different temperatures.
Shown in Figure 3 is the appraisal procedure process flow diagram of the austenitic steel steam oxidation skin growth conditions of preferred embodiment of the present invention.
Fig. 4 a～Fig. 4 d is depicted as the growth course synoptic diagram of austenitic steel steam oxidation skin.
Embodiment
In order more to understand technology contents of the present invention, special act specific embodiment also cooperates appended graphic explanation following.
Please refer to Fig. 3, shown in Figure 3 is the appraisal procedure process flow diagram of the austenitic steel steam oxidation skin growth conditions of preferred embodiment of the present invention.
The present invention proposes a kind of appraisal procedure of austenitic steel steam oxidation skin growth conditions, is applicable to the station boiler high-temperature surface, comprises the following steps:
S1: the growth model of setting up austenitic steel high-temperature steam oxide skin;
S2: collection tube appearance steam oxidation skin medium of living in, temperature conditions;
S3: unit maintenance pipe cutting pipe appearance is carried out end face micro-zone analysis (comprising thickness, hierarchy, hole ratio, element distribution etc.);
S4: micro-zone analysis is converted into a plurality of qualitative and quantitative index;
S5: austenitic steel boiler tube pipe appearance steam oxidation skin growth conditions and the trend of peeling off are estimated, and proposed the suggestion in operation and the maintenance.
The preferred embodiment according to the present invention, the growth model of said austenitic steel high-temperature steam oxide skin is divided into four-stage with boiler high temperature heating surface austenitic steel steam oxidation skin growth conditions: 1) oxide skin thickens; 2) produce the cavity in the middle of the oxide skin; 3) intermediate void runs through and causes layering; 4) peel off between the oxide skin ectonexine.Please refer to Fig. 4, Fig. 4 a～Fig. 4 d is depicted as the growth course synoptic diagram of austenitic steel steam oxidation skin.
Further, said unit maintenance pipe cutting pipe appearance is analyzed adopts field emission scanning electron microscope to carry out microcell high-resolution two dimension morphology observation and dimension is accurately measured, and uses X-ray energy spectrometer that regional area is carried out the microcell component analysis.The preferred embodiment according to the present invention; Unit maintenance pipe cutting pipe appearance is analyzed; Be to utilize the field emission scanning electron microscope XL30FEG (resolution 2.0nm) of Philips can realize that microcell high-resolution two dimension morphology observation and dimension accurately measure; And use EDX (X-ray energy spectrometer) to carry out the microcell component analysis, and quantitative and the qualitative list record of filling in to interesting areas.
Further, putting in order layer thickness when oxide skin is 30～50 μ m, and the oxide skin outer layer thickness is 15～25 μ m; Layer thickness is 15～25 μ m in the oxide skin; When obvious layering does not appear in simultaneous oxidation skin hierarchy, judge that oxide skin is in good condition, note the control overtemperature in the equipment operation.
When the whole layer thickness of oxide skin is 50～70 μ m; The oxide skin outer layer thickness is 25～35 μ m, and layer thickness is 25～35 μ m in the oxide skin, when the appearance of simultaneous oxidation skin hierarchy is empty in a large number; Judgement oxide skin is peeled off trend; Avoid the fluctuation of loading in the equipment operation, inspection is strengthened in the operation of strict control start and stop in the maintenance.
When the whole layer thickness of oxide skin is 70～100 μ m; The oxide skin outer layer thickness is 30～50 μ m, and layer thickness is 30～50 μ m in the oxide skin, and the cavity appears in simultaneous oxidation skin hierarchy when running through; Judge that oxide skin is about to peel off; Strengthen the inspection cleaning in the suggestion maintenance, initiatively disturbance is peeled off it, and in maintenance, clears up.
The appraisal procedure that is applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions that the present invention proposes; Can assess the growth conditions of station boiler high temperature furnace pipe steam oxidation skin; And then high temperature furnace pipe steam oxidation skin peeled off risk analysis; For boiler operatiopn and maintenance provide foundation, improve the security and the economy of boiler operatiopn.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under the present invention, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (7)
1. the appraisal procedure of an austenitic steel steam oxidation skin growth conditions is applicable to the station boiler high-temperature surface, it is characterized in that, comprises the following steps:
Set up the growth model of austenitic steel high-temperature steam oxide skin;
Collection tube appearance steam oxidation skin medium of living in, temperature conditions;
Unit maintenance pipe cutting pipe appearance is carried out the end face micro-zone analysis;
Micro-zone analysis is converted into a plurality of qualitative and quantitative index;
Austenitic steel boiler tube pipe appearance steam oxidation skin growth conditions and the trend of peeling off are estimated, and proposed the suggestion in operation and the maintenance.
2. the appraisal procedure of austenitic steel steam oxidation skin growth conditions according to claim 1; It is characterized in that the growth model of said austenitic steel high-temperature steam oxide skin is divided into four-stage with boiler high temperature heating surface austenitic steel steam oxidation skin growth conditions: 1) oxide skin thickens; 2) produce the cavity in the middle of the oxide skin; 3) intermediate void runs through and causes layering; 4) peel off between the oxide skin ectonexine.
3. the appraisal procedure of austenitic steel steam oxidation skin growth conditions according to claim 1; It is characterized in that; Said unit maintenance pipe cutting pipe appearance is analyzed adopts field emission scanning electron microscope to carry out microcell high-resolution two dimension morphology observation and dimension is accurately measured, and uses X-ray energy spectrometer that regional area is carried out the microcell component analysis.
4. the appraisal procedure of austenitic steel steam oxidation skin growth conditions according to claim 1; It is characterized in that putting in order layer thickness when oxide skin is 30～50 μ m, the oxide skin outer layer thickness is 15～25 μ m; Layer thickness is 15～25 μ m in the oxide skin; When obvious layering does not appear in simultaneous oxidation skin hierarchy, judge that oxide skin is in good condition, note the control overtemperature in the equipment operation.
5. the appraisal procedure of austenitic steel steam oxidation skin growth conditions according to claim 1 is characterized in that, when the whole layer thickness of oxide skin is 50～70 μ m; The oxide skin outer layer thickness is 25～35 μ m, and layer thickness is 25～35 μ m in the oxide skin, when the appearance of simultaneous oxidation skin hierarchy is empty in a large number; Judgement oxide skin is peeled off trend; Avoid the fluctuation of loading in the equipment operation, inspection is strengthened in the operation of strict control start and stop in the maintenance.
6. the appraisal procedure of austenitic steel steam oxidation skin growth conditions according to claim 1 is characterized in that, when the whole layer thickness of oxide skin is 70～100 μ m; The oxide skin outer layer thickness is 30～50 μ m, and layer thickness is 30～50 μ m in the oxide skin, and the cavity appears in simultaneous oxidation skin hierarchy when running through; Judge that oxide skin is about to peel off; Strengthen the inspection cleaning in the suggestion maintenance, initiatively disturbance is peeled off it, and in maintenance, clears up.
7. the appraisal procedure of austenitic steel steam oxidation skin growth conditions according to claim 1 is characterized in that, saidly unit maintenance pipe cutting pipe appearance is carried out the end face micro-zone analysis comprises and carries out the micro-zone analysis that thickness, hierarchy, hole ratio, element distribute.
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Cited By (6)
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| CN104390992A (en) * | 2014-11-25 | 2015-03-04 | 西安热工研究院有限公司 | Method for detecting source of oxide scale peeled off from inner wall of heated surface of boiler |
| CN106093040A (en) * | 2016-06-15 | 2016-11-09 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of thermal power generation unit boiler water wall scaling type and the analysis method of reason |
| CN108519290A (en) * | 2018-04-02 | 2018-09-11 | 华能国际电力股份有限公司 | Identification method for regenerated oxide layer on inner wall of high-temperature high-pressure steam pipeline |
| CN109084829A (en) * | 2018-06-20 | 2018-12-25 | 淮浙煤电有限责任公司凤台发电分公司 | A kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method |
| WO2019095658A1 (en) * | 2017-11-15 | 2019-05-23 | 东北大学 | Design method of chemical cleaning scheme for superheater pipe of supercritical power station boiler |
| CN110031782A (en) * | 2019-03-08 | 2019-07-19 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Austenitic heat-resistance steel magnetic transformation and oxide skin monitor system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390992A (en) * | 2014-11-25 | 2015-03-04 | 西安热工研究院有限公司 | Method for detecting source of oxide scale peeled off from inner wall of heated surface of boiler |
| CN106093040A (en) * | 2016-06-15 | 2016-11-09 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of thermal power generation unit boiler water wall scaling type and the analysis method of reason |
| WO2019095658A1 (en) * | 2017-11-15 | 2019-05-23 | 东北大学 | Design method of chemical cleaning scheme for superheater pipe of supercritical power station boiler |
| CN108519290A (en) * | 2018-04-02 | 2018-09-11 | 华能国际电力股份有限公司 | Identification method for regenerated oxide layer on inner wall of high-temperature high-pressure steam pipeline |
| CN108519290B (en) * | 2018-04-02 | 2020-06-30 | 华能国际电力股份有限公司 | Identification method for regenerated oxide layer on inner wall of high-temperature high-pressure steam pipeline |
| CN109084829A (en) * | 2018-06-20 | 2018-12-25 | 淮浙煤电有限责任公司凤台发电分公司 | A kind of overcritical thermal power generation unit high-temperature surface oxidation rate verifying and calibration method |
| CN109084829B (en) * | 2018-06-20 | 2020-12-18 | 淮浙煤电有限责任公司凤台发电分公司 | Method for verifying and calibrating oxidation rate of high-temperature heating surface of supercritical thermal generator set |
| CN110031782A (en) * | 2019-03-08 | 2019-07-19 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Austenitic heat-resistance steel magnetic transformation and oxide skin monitor system |
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| CN102749038B (en) | 2016-02-03 |
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