CN102749038B - The detection method of austenitic steel steam oxidation skin growth conditions - Google Patents
The detection method of austenitic steel steam oxidation skin growth conditions Download PDFInfo
- Publication number
- CN102749038B CN102749038B CN201110100174.1A CN201110100174A CN102749038B CN 102749038 B CN102749038 B CN 102749038B CN 201110100174 A CN201110100174 A CN 201110100174A CN 102749038 B CN102749038 B CN 102749038B
- Authority
- CN
- China
- Prior art keywords
- steam oxidation
- skin
- oxidation skin
- growth conditions
- austenitic steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Sampling And Sample Adjustment (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The present invention proposes a kind of detection method of austenitic steel steam oxidation skin growth conditions, is applicable to station boiler high-temperature surface, comprises the following steps: the growth model setting up austenitic steel pyrogenic steam oxidation skin; Medium, temperature conditions residing for collection tube sample steam oxidation skin; Unit maintenance pipe cutting pipe sample carries out end face micro-zone analysis (thickness, hierarchy, hole ratio, Elemental redistribution etc.); Multiple qualitative and quantitative index is converted into micro-zone analysis; Austenite steel furnace pipe pipe sample steam oxidation skin growth conditions and the trend of peeling off are judged; Suggestion in running and overhauling is proposed.The detection method being applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions that the present invention proposes, the growth conditions of station boiler high temperature furnace pipe steam oxidation skin is detected, and then the stripping risk of high temperature furnace pipe steam oxidation skin is analyzed, for boiler operatiopn and maintenance provide foundation, improve security and the economy of boiler operatiopn.
Description
Technical field
The present invention relates to station boiler pipe state inspection field, and in particular to a kind of detection method being applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions.
Background technology
Current super (super-) critical unit high-temperature surface generally adopts austenitic steel, the plugging that this kind of material causes because pyrogenic steam oxidation skin peels off, booster fault happen occasionally, and become and threaten one of the safety of super (super-) critical unit, key factor of stable operation at present.Boiler heating surface steam interface is actual is iron/water (vapour)/O
2deng reaction interface, and form rapidly the oxide film (skin) that has protectiveness.The design feature of oxide film, closely related with material, temperature of reaction, steam feature.
Fig. 1 a and Fig. 1 b is depicted as the end face characteristic of typical oxidation film, although structurally there are some differences, can divide into double-layer structure, i.e. epitaxial loayer and interior generating 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 initial surface 100 separately between internal layer and skin.Fig. 2 a ~ Fig. 2 d is the basic structure schematic 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 is higher, and oxide film surface microstructure is finer and close, and surface is more smooth.
The main method of current judgement station boiler " four pipes " (economizer, water-cooling wall, superheater, reheater) clean-up performance utilizes maintenance to carry out pipe cutting inspection, mainly carries out dirt amount and scale sample ingredient test.Cleanup acid treatment is carried out to pipe sample and obtains dirt amount and dirty sample, and qualitative classification is carried out to dirt amount and surface corrosion situation, obtain dirt amount by pipe sample weight difference before and after pickling.Traditional dirt amount and component analyzing method can only judge boiler tube dirt amount number, the sedimental status monitoring of boiler tube cannot be carried out; For judging pyrogenic steam oxidation skin, its limitation is to characterize the growth conditions of pyrogenic steam oxidation skin and peels off trend, foundation can not be provided for boiler maintenance and operation, often make peeling off of pyrogenic steam oxidation skin become passive accident, cause the security of unit operation and economy greatly to reduce.And the detection method of a kind of furnace tube high temperature steam oxidation skin growth conditions that the present invention proposes, be a kind of new boiler tube status monitoring pattern, the discovery of hidden danger is done sth. in advance greatly with improvement, the monitoring level of super (super-) critical unit can be improved.
Rule is peeled off in the growth of pyrogenic steam oxidation skin grasping austenitic steel, the growth conditions detection technique of exploitation high temperature furnace pipe steam oxidation skin, for high temperature furnace pipe steam oxidation skin prevention and control and administer particularly important.
Summary of the invention
The present invention proposes a kind of detection method being applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions, the growth conditions of station boiler high temperature furnace pipe steam oxidation skin is detected, and then the stripping risk of high temperature furnace pipe steam oxidation skin is analyzed, for boiler operatiopn and maintenance provide foundation, improve security and the economy of boiler operatiopn.
In order to achieve the above object, the present invention proposes a kind of detection method of austenitic steel steam oxidation skin growth conditions, is applicable to station boiler high-temperature surface, comprises the following steps:
Set up the growth model of austenitic steel pyrogenic steam oxidation skin;
Medium, temperature conditions residing for collection tube sample steam oxidation skin;
End face micro-zone analysis is carried out to unit maintenance pipe cutting pipe sample;
Micro-zone analysis is converted into multiple qualitative and quantitative index;
Austenite steel furnace pipe pipe sample steam oxidation skin growth conditions and the trend of peeling off are judged, and proposes the suggestion in operation and maintenance.
Further, boiler high temperature heating surface austenitic steel steam oxidation skin growth conditions is divided into four-stage by the growth model of described austenitic steel pyrogenic steam oxidation skin: 1) the thickening of oxide skin; 2) cavity is produced in the middle of oxide skin; 3) intermediate void runs through and causes layering; 4) peel off between oxide skin ectonexine.
Further, describedly analysis is carried out to unit maintenance pipe cutting pipe sample adopt field emission scanning electron microscope to carry out microcell high-resolution two-dimensional appearance to observe and dimension is accurately measured, and use X-ray energy spectrometer localized region to carry out microcell component analysis.
Further, when oxide skin flood thickness is 30 ~ 50 μm, oxide skin outer layer thickness is 15 ~ 25 μm, oxide skin internal layer thickness is 15 ~ 25 μm, when obvious layering does not appear in simultaneous oxidation skin hierarchy, judge that oxide skin is in good condition, attentional manipulation overtemperature during equipment runs.
Further; when oxide skin flood thickness is 50 ~ 70 μm; oxide skin outer layer thickness is 25 ~ 35 μm; oxide skin internal layer thickness is 25 ~ 35 μm; when a large amount of cavity appears in simultaneous oxidation skin hierarchy, judge that oxide skin peels off trend, equipment avoids load fluctuation in running; strict control start and stop operation, strengthens in maintenance checking.
Further, when oxide skin flood thickness is 70 ~ 100 μm, oxide skin outer layer thickness is 30 ~ 50 μm, oxide skin internal layer thickness is 30 ~ 50 μm, when simultaneous oxidation skin hierarchy occurs that cavity is run through, judge that oxide skin is about to peel off, strengthen checking cleaning in suggestion maintenance, initiatively disturbance makes it peel off, and clears up in maintenance.
Further, describedly end face micro-zone analysis is carried out to unit maintenance pipe cutting pipe sample comprise the micro-zone analysis carrying out thickness, hierarchy, hole ratio, Elemental redistribution.
The detection method being applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions that the present invention proposes, can detect the growth conditions of station boiler high temperature furnace pipe steam oxidation skin, and then the stripping risk of high temperature furnace pipe steam oxidation skin is analyzed, for boiler operatiopn and maintenance provide foundation, improve security and the economy of boiler operatiopn.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b is depicted as the end face characteristic schematic diagram of typical oxidation film.
Fig. 2 a ~ Fig. 2 d is the basic structure schematic diagram of the interval heating surface oxide film of different temperatures.
Figure 3 shows that the detection method process flow diagram of the austenitic steel steam oxidation skin growth conditions of present pre-ferred embodiments.
Fig. 4 a ~ Fig. 4 d is depicted as the growth course schematic diagram of austenitic steel steam oxidation skin.
Embodiment
In order to more understand technology contents of the present invention, institute's accompanying drawings is coordinated to be described as follows especially exemplified by specific embodiment.
Please refer to Fig. 3, Figure 3 shows that the detection method process flow diagram of the austenitic steel steam oxidation skin growth conditions of present pre-ferred embodiments.
The present invention proposes a kind of detection method of austenitic steel steam oxidation skin growth conditions, is applicable to station boiler high-temperature surface, comprises the following steps:
S1: the growth model setting up austenitic steel pyrogenic steam oxidation skin;
S2: medium, temperature conditions residing for collection tube sample steam oxidation skin;
S3: end face micro-zone analysis (comprising thickness, hierarchy, hole ratio, Elemental redistribution etc.) is carried out to unit maintenance pipe cutting pipe sample;
S4: micro-zone analysis is converted into multiple qualitative and quantitative index;
S5: Austenite steel furnace pipe pipe sample steam oxidation skin growth conditions and the trend of peeling off are judged, and the suggestion in operation and maintenance is proposed.
According to present pre-ferred embodiments, boiler high temperature heating surface austenitic steel steam oxidation skin growth conditions is divided into four-stage by the growth model of described austenitic steel pyrogenic steam oxidation skin: 1) the thickening of oxide skin; 2) cavity is produced in the middle of oxide skin; 3) intermediate void runs through and causes layering; 4) peel off between oxide skin ectonexine.Please refer to Fig. 4, Fig. 4 a ~ Fig. 4 d is depicted as the growth course schematic diagram of austenitic steel steam oxidation skin.
Further, describedly analysis is carried out to unit maintenance pipe cutting pipe sample adopt field emission scanning electron microscope to carry out microcell high-resolution two-dimensional appearance to observe and dimension is accurately measured, and use X-ray energy spectrometer localized region to carry out microcell component analysis.According to present pre-ferred embodiments, unit maintenance pipe cutting pipe sample is analyzed, be utilize the field emission scanning electron microscope XL30FEG (resolution 2.0nm) of Philips can realize microcell high-resolution two-dimensional appearance observe and dimension accurately measure, and use EDX (X-ray energy spectrometer) microcell component analysis can be carried out to interested region, and quantitatively fill in list record with qualitative.
Further, when oxide skin flood thickness is 30 ~ 50 μm, oxide skin outer layer thickness is 15 ~ 25 μm, oxide skin internal layer thickness is 15 ~ 25 μm, when obvious layering does not appear in simultaneous oxidation skin hierarchy, judge that oxide skin is in good condition, attentional manipulation overtemperature during equipment runs.
When oxide skin flood thickness is 50 ~ 70 μm; oxide skin outer layer thickness is 25 ~ 35 μm; oxide skin internal layer thickness is 25 ~ 35 μm; when there is a large amount of cavity in simultaneous oxidation skin hierarchy; judge that oxide skin peels off trend; equipment avoids load fluctuation in running, and the strict start and stop that controls operates, and strengthens checking in maintenance.
When oxide skin flood thickness is 70 ~ 100 μm, oxide skin outer layer thickness is 30 ~ 50 μm, oxide skin internal layer thickness is 30 ~ 50 μm, when simultaneous oxidation skin hierarchy occurs that cavity is run through, judge that oxide skin is about to peel off, strengthen checking cleaning in suggestion maintenance, initiatively disturbance makes it peel off, and clears up in maintenance.
The detection method being applicable to station boiler high-temperature surface austenitic steel steam oxidation skin growth conditions that the present invention proposes, can detect the growth conditions of station boiler high temperature furnace pipe steam oxidation skin, and then the stripping risk of high temperature furnace pipe steam oxidation skin is analyzed, for boiler operatiopn and maintenance provide foundation, improve security and the economy of boiler operatiopn.
Although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (6)
1. a detection method for austenitic steel steam oxidation skin growth conditions, is applicable to station boiler high-temperature surface, it is characterized in that, comprise the following steps:
Set up the growth model of austenitic steel pyrogenic steam oxidation skin;
Medium, temperature conditions residing for collection tube sample steam oxidation skin;
End face micro-zone analysis is carried out to unit maintenance pipe cutting pipe sample;
Micro-zone analysis is converted into multiple qualitative and quantitative index;
Austenite steel furnace pipe pipe sample steam oxidation skin growth conditions and the trend of peeling off are judged, and the suggestion proposed in operation and maintenance, wherein, when oxide skin flood thickness is 30 ~ 50 μm, oxide skin outer layer thickness is 15 ~ 25 μm, and oxide skin internal layer thickness is 15 ~ 25 μm, when obvious layering does not appear in simultaneous oxidation skin hierarchy, judge that oxide skin is in good condition, attentional manipulation overtemperature during equipment runs.
2. the detection method of austenitic steel steam oxidation skin growth conditions according to claim 1, it is characterized in that, boiler high temperature heating surface austenitic steel steam oxidation skin growth conditions is divided into four-stage by the growth model of described austenitic steel pyrogenic steam oxidation skin: 1) the thickening of oxide skin; 2) cavity is produced in the middle of oxide skin; 3) intermediate void runs through and causes layering; 4) peel off between oxide skin ectonexine.
3. the detection method of austenitic steel steam oxidation skin growth conditions according to claim 1, it is characterized in that, describedly analysis is carried out to unit maintenance pipe cutting pipe sample adopt field emission scanning electron microscope to carry out microcell high-resolution two-dimensional appearance to observe and dimension is accurately measured, and use X-ray energy spectrometer localized region to carry out microcell component analysis.
4. the detection method of austenitic steel steam oxidation skin growth conditions according to claim 1; it is characterized in that; when oxide skin flood thickness is 50 ~ 70 μm; oxide skin outer layer thickness is 25 ~ 35 μm, and oxide skin internal layer thickness is 25 ~ 35 μm, when a large amount of cavity appears in simultaneous oxidation skin hierarchy; judge that oxide skin peels off trend; equipment avoids load fluctuation in running, and the strict start and stop that controls operates, and strengthens checking in maintenance.
5. the detection method of austenitic steel steam oxidation skin growth conditions according to claim 1, it is characterized in that, when oxide skin flood thickness is 70 ~ 100 μm, oxide skin outer layer thickness is 30 ~ 50 μm, and oxide skin internal layer thickness is 30 ~ 50 μm, when simultaneous oxidation skin hierarchy occurs that cavity is run through, judge that oxide skin is about to peel off, strengthen checking cleaning in suggestion maintenance, initiatively disturbance makes it peel off, and clears up in maintenance.
6. the detection method of austenitic steel steam oxidation skin growth conditions according to claim 1, is characterized in that, describedly carries out end face micro-zone analysis to unit maintenance pipe cutting pipe sample and comprises the micro-zone analysis carrying out thickness, hierarchy, hole ratio, Elemental redistribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110100174.1A CN102749038B (en) | 2011-04-20 | 2011-04-20 | The detection method of austenitic steel steam oxidation skin growth conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110100174.1A CN102749038B (en) | 2011-04-20 | 2011-04-20 | The detection method of austenitic steel steam oxidation skin growth conditions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102749038A CN102749038A (en) | 2012-10-24 |
| CN102749038B true CN102749038B (en) | 2016-02-03 |
Family
ID=47029420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110100174.1A Active CN102749038B (en) | 2011-04-20 | 2011-04-20 | The detection method of austenitic steel steam oxidation skin growth conditions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102749038B (en) |
Families Citing this family (6)
| 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 |
| CN107844863B (en) * | 2017-11-15 | 2019-12-31 | 东北大学 | Design method of supercritical power station boiler superheater pipeline chemical cleaning scheme |
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750011A (en) * | 2010-01-19 | 2010-06-23 | 广东拓奇电力技术发展有限公司 | Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method |
| CN101995375A (en) * | 2009-08-18 | 2011-03-30 | 华东电力试验研究院有限公司 | Evaluation method for anticorrosion capacity of oxidation film on steam-water interface of heating surface of power station boiler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05235018A (en) * | 1992-02-26 | 1993-09-10 | Toshiba Corp | Manufacture of semiconductor device |
-
2011
- 2011-04-20 CN CN201110100174.1A patent/CN102749038B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995375A (en) * | 2009-08-18 | 2011-03-30 | 华东电力试验研究院有限公司 | Evaluation method for anticorrosion capacity of oxidation film on steam-water interface of heating surface of power station boiler |
| CN101750011A (en) * | 2010-01-19 | 2010-06-23 | 广东拓奇电力技术发展有限公司 | Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method |
Non-Patent Citations (2)
| Title |
|---|
| 12X18H12T钢管蒸汽侧氧化皮及其剥落物的微观结构与形貌特征;贾建民 等;《中国电机工程学报》;20080615;第28卷(第17期);第43-48页 * |
| 超（超）临界锅炉高温受热面蒸汽氧化皮的生长与剥落特性;黄兴德 等;《动力工程》;20090630;第29卷(第6期);第602-608页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102749038A (en) | 2012-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102749038B (en) | The detection method of austenitic steel steam oxidation skin growth conditions | |
| Wang et al. | Near-wake flow characteristics of a circular cylinder close to a wall | |
| Li et al. | The subsurface damage mechanism of Inconel 690 during fretting wear in pure water | |
| CN106908671A (en) | A kind of non-intrusion type household loads intelligent detecting method and system | |
| Attia et al. | Effect of temperature on tribo-oxide formation and the fretting wear and friction behavior of zirconium and nickel-based alloys | |
| CN102937239B (en) | Monitoring method for LNG storage tank safety by means of fault tree and HAZOP | |
| Sawarn et al. | Study of oxide and α-Zr (O) growth kinetics from high temperature steam oxidation of Zircaloy-4 cladding | |
| Zhang et al. | Effect of the third body layer formed at different temperature on fretting wear behavior of 316 stainless steel in the composite fretting motion of slip and impact | |
| Shokralla et al. | Surface profiling with high density eddy current non-destructive examination data | |
| CN103063502A (en) | Method for etching G102 steel metallographic specimen | |
| Roelandt et al. | A modified electrochemical technique (electrochemical potentiokinetic reactivation) for evaluating the susceptibility of Inconel 600 to intergranular corrosion | |
| Zboray et al. | On the relevance of low side flows for thermal loads in T-junctions | |
| Wang et al. | Roles of permeated hydrogen in the oxidation process of Ni-based alloy in high temperature water environment | |
| Li et al. | Corrosion fatigue damage mechanism and life evaluation of Inconel Alloy 690TT steam generator tube in high temperature pressurized water | |
| Perez-Feró et al. | Experimental database of E110 claddings exposed to accident conditions | |
| Wright et al. | Steam-side scale morphologies associated with scale exfoliation from ferritic steel T22 | |
| WO2019095658A1 (en) | Design method of chemical cleaning scheme for superheater pipe of supercritical power station boiler | |
| Short et al. | A perspective on coupled multiscale simulation and validation in nuclear materials | |
| Shriwastaw et al. | Estimation of ring tensile properties of steam oxidized Zircaloy-4 fuel cladding under simulated LOCA condition | |
| Timothy et al. | Application of fatigue monitoring to the evaluation of pressurizer surge lines | |
| Hózer et al. | Experimental simulation of the Paks-2 cleaning tank incident through separate effect and integral tests | |
| Chen et al. | Influence of second phase particles on corrosion resistance of N36 alloy in superheated steam | |
| Choi et al. | Development of a web-based aging monitoring system for an integrity evaluation of the major components in a nuclear power plant | |
| Wang et al. | Weak Magnetic Signal Characteristics for Critical Damage of Oil and Gas Pipelines Based on Electron Spinning | |
| Zhong et al. | Experimental study on surface characteristics and thermal conductivity of new zirconium alloy with oxide layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |