CN1924549B - Measuring method for high-pressure heater heat exchange pipe scour-corrosion experiment - Google Patents
Measuring method for high-pressure heater heat exchange pipe scour-corrosion experiment Download PDFInfo
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- CN1924549B CN1924549B CN2005100293094A CN200510029309A CN1924549B CN 1924549 B CN1924549 B CN 1924549B CN 2005100293094 A CN2005100293094 A CN 2005100293094A CN 200510029309 A CN200510029309 A CN 200510029309A CN 1924549 B CN1924549 B CN 1924549B
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Abstract
This invention relates to one high pressure heat exchanger flushing erosion testament measurement method, which is characterized by the measurement in water medium, high speed and temperature and pressure. The method comprises the following steps: firstly flushing testament point selection with speed at 1.9-4.5m/s and temperature as 180-300DEG C and pressure as 2-6MPa, pH value as 7-9.5; Measuring flushing specimen for erosion, surface film, micro organization, flushing front and back different part stress status and rough degree.
Description
Technical field
The present invention relates to a kind of measuring method of high-pressure heater heat exchange pipe scour-corrosion experiment, relate in particular to the measuring method of the erosion-corrosion experiment of a kind of high-pressure heater heat exchanger tube under high temperature, condition of high voltage, can be used for nuclear power and thermal power unit and make the field.
Background technology
Erosion corrosion is the bigger local corrosion of a kind of harm, and it is much more serious than simple corrosion and simple mechanical wear, damage that can acceleration equipment when equipment is subjected to erosion corrosion, and shorten the serviceable life of equipment greatly.
To continuing to increase that nuclear power station and thermo-power station construction drop into, make also more deep to the research of nuclear power station and thermo-power station relevant device along with both at home and abroad both at home and abroad.The erosion-corrosion experiment problem of high-pressure heater heat exchanger tube under high temperature, condition of high voltage at one of nuclear power station and thermo-power station visual plant, also made big quantity research both at home and abroad, some effective experimental techniques have been proposed, comprising oily medium erosion-corrosion experiment, metal erosion corrosion and high temperature, the experiment of high pressure static corrosion etc. in liquid fixed double phase flow.
Find that by prior art documents fourth one has just waited " erosion corrosion of metal in liquid fixed double phase flow " delivered at " material protection " 2001,34 (11), has summarized the research of the erosion corrosion system of liquid fixed double phase flow being carried out both at home and abroad.Although this research has had further understanding to washing away corrosion process, to erosion corrosion influence rule and harmfulness is discussed, yet, do not see formal report at the high-pressure heater heat exchange pipe scour-corrosion experiment under aqueous medium, high temperature, condition of high voltage both at home and abroad.
Summary of the invention
The objective of the invention is to invent and a kind ofly guaranteeing that single experiment node washes away under constant prerequisite experimental period, reduces the measuring method of the high-pressure heater heat exchange pipe scour-corrosion experiment of total experimental period and experimental expenses.On experiment basis, the controlling factor and the mechanism of production of the erosion corrosion of analyzing influence heat exchanger tube, set up the quantification formula of erosion corrosion, set up mathematical model according to erosion weight, surface film, microstructure, the variation of washing away front and back different parts stress state and roughness and carry out data analysis, seek to control the measure of erosion corrosion.
For realizing above purpose, technical scheme of the present invention provides a kind of measuring method of high-pressure heater heat exchange pipe scour-corrosion experiment, it is characterized in that, measures under aqueous medium, high flow rate, high temperature, condition of high voltage, and its method is:
The first step. wash away choosing of experiment node:
At flow velocity is that 1.9-4.5m/s, temperature are that 180-300 ℃, pressure are that 2-6MPa, pH value are to choose 4-8 experiment node at least between the 7-9.5;
Second step. washed away the measurement of sample:
To being washed away the measurement that sample loses weight, surface film, microstructure, washes away front and back different parts stress state and roughness.
The described sample that washed away is various metals.
Erosion corrosion (Erosion-Corrosion) be metal surface and corrosive fluids owing to the metal that the high speed relative motion causes damages phenomenon, be that material is washed away and corrodes synergistic result.Erosion corrosion is a very complicated process, and influence factor is a lot, and the chemical analysis of material itself, institutional framework, mechanical property, hardness, surfaceness, corrosion resisting property etc. are aspects; And the concentration of the temperature of medium, pH value, dissolved oxygen amount, various active ions, viscosity, density, solid phase and gas phase content, solid phase particles degree and the hardness in liquid phase is on the other hand, and the shape of filter element, flow rate of fluid and fluidised form also tool have a significant impact, because different flow velocitys, fluidised form can make fluid that material surface is produced different mechanics effects.Than other factors, flow velocity, temperature and pH value are the most obvious to the influence of erosion corrosion.Therefore, in order to reduce experimental period and experimental expenses, under the prerequisite that can reflect the erosion-corrosion experiment effect, choose the experiment node of trying one's best few, adopt 4-8 to test node at each experimental point, to reach the purpose of utilizing less experiment node to set up mathematical model, experimental data is analyzed.
Water volume flow rate plays an important role in erosion corrosion, influences the mechanism of erosion corrosion.Its increases corrosion can be by increasing supply that mordant such as oxygen, carbon dioxide contacts with the metal surface or by reducing the thickness of surface static film, making the diffusion and transfer increase of corrosion things such as metallic ion.Lower flow velocity also may be owing to having stoped the mud that causes crevice corrosion or the deposition of dust and dirt to reduce corrosion.Therefore different in flow rate is different to the metal erosion influence.
The water body that the pH value is different, metal erosion rate difference, be since the character of surperficial produced film with due to composition is different.Have only in medium to have added enough oxygenants, have the metal of passive behavior could produce passive state, and the metal that does not have passive behavior, the existence of oxygen particularly under neutrallty condition, will speed up the dissolving of anode metal.Along with the rising of temperature, the kinetic parameter of electrochemical reaction and the coefficient of diffusion of oxygen increase, but dissolved oxygen content reduces, and the rising of temperature can change the characteristic of metal surface film and the metal ability of passivation again.Different situations, rising temperature both may make the metal erosion rate reduce, and the metal erosion rate is improved.Can obtain the metal erosion rate under the different temperatures by experiment.
Advantage of the present invention is to shorten total erosion corrosion time greatly, thereby improves erosion-corrosion experiment efficient 20-30%, reduces experimental expenses.
Description of drawings
Fig. 1 is the measuring method process flow diagram of high-pressure heater heat exchange pipe scour-corrosion experiment.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1
As shown in Figure 1, be the measuring method process flow diagram of high-pressure heater heat exchange pipe scour-corrosion experiment, its method of testing is: the first step. wash away choosing of experiment node: material: carbon steel SA556CrC2
Table 1 (washing away experiment 4 nodes chooses)
Embodiment 2
The first step. wash away choosing of experiment node:
Table 2 (washing away experiment 7 nodes chooses)
Second step. washed away the measurement of sample:
Lost weight, surface film, microstructure to washing away sample, wash away front and back different parts stress state and roughness concentration.
Table 3 measurement result, material: SA556CrC2
Speed V temperature T alloying component (wt%) residual stress level roughness
Numbering pH
(m/s)(℃) Fe Cr Ni Mo (kgf/mm
2)(μm)
Remarks: material category, back represented in the first letter of sample encoded is the sample sequence numbering.
The present invention is equally applicable to the erosion-corrosion experiment of various metals.
Claims (2)
1. the measuring method of a high-pressure heater heat exchange pipe scour-corrosion experiment is characterized in that, measures under aqueous medium, high flow rate, high temperature, condition of high voltage, and its method is:
The first step. wash away choosing of experiment node:
At flow velocity is that 1.9-4.5m/s, temperature are that 180-300 ℃, pressure are that 2-6MPa, pH value are to choose 4-8 experiment node at least between the 7-9.5;
Second step. washed away the measurement of sample:
Lost weight, surface film, microstructure to washing away sample, wash away front and back different parts stress state and roughness concentration.
2. the measuring method of high-pressure heater heat exchange pipe scour-corrosion experiment according to claim 1 is characterized in that, the described sample that washed away is various metals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005100293094A CN1924549B (en) | 2005-09-01 | 2005-09-01 | Measuring method for high-pressure heater heat exchange pipe scour-corrosion experiment |
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| CN2005100293094A CN1924549B (en) | 2005-09-01 | 2005-09-01 | Measuring method for high-pressure heater heat exchange pipe scour-corrosion experiment |
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| CN1924549A CN1924549A (en) | 2007-03-07 |
| CN1924549B true CN1924549B (en) | 2010-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2797941C1 (en) * | 2022-07-19 | 2023-06-13 | Сысоев Николай Николаевич | Method for diagnostics and quality control of a controlled object |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841018A (en) * | 2017-02-14 | 2017-06-13 | 湘潭大学 | A kind of system of the resistance to low-melting-point metal liquid phase Dynamic Corrosion performance of test material |
| CN109374518B (en) * | 2018-10-09 | 2021-07-09 | 中国科学院海洋研究所 | Testing device and method for simulating gas-liquid interface corrosion of nuclear waste liquid storage tank |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4686854A (en) * | 1981-06-18 | 1987-08-18 | Drew Chemical Corporation | Process and apparatus for measuring corrosion rate of a heat transfer surface |
| EP0235409A1 (en) * | 1986-02-24 | 1987-09-09 | Exxon Chemical Patents Inc. | Corrosion simulator useful for heat exchangers condensing vapors containing water |
| US5377533A (en) * | 1992-07-20 | 1995-01-03 | Shaw; Larry | Method of taking erosion/corrosion measurements |
| CN2459652Y (en) * | 2000-12-21 | 2001-11-14 | 中国科学院金属研究所 | Jetting type liquid-solid double-phase scouring corrosion experiment apparatus |
| CN1363835A (en) * | 2001-01-10 | 2002-08-14 | 中国科学院金属研究所 | High-temp high-flow-speed outwash experiment equipment |
-
2005
- 2005-09-01 CN CN2005100293094A patent/CN1924549B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4686854A (en) * | 1981-06-18 | 1987-08-18 | Drew Chemical Corporation | Process and apparatus for measuring corrosion rate of a heat transfer surface |
| EP0235409A1 (en) * | 1986-02-24 | 1987-09-09 | Exxon Chemical Patents Inc. | Corrosion simulator useful for heat exchangers condensing vapors containing water |
| US5377533A (en) * | 1992-07-20 | 1995-01-03 | Shaw; Larry | Method of taking erosion/corrosion measurements |
| CN2459652Y (en) * | 2000-12-21 | 2001-11-14 | 中国科学院金属研究所 | Jetting type liquid-solid double-phase scouring corrosion experiment apparatus |
| CN1363835A (en) * | 2001-01-10 | 2002-08-14 | 中国科学院金属研究所 | High-temp high-flow-speed outwash experiment equipment |
Non-Patent Citations (2)
| Title |
|---|
| 张小农,李小璀,赵晓峰,梨晓桃.热电站冷凝器用黄铜管的腐蚀特征与机制.上海有色金属第24卷 第2期.2003,第24卷(第2期),55-59. |
| 张小农,李小璀,赵晓峰,梨晓桃.热电站冷凝器用黄铜管的腐蚀特征与机制.上海有色金属第24卷 第2期.2003,第24卷(第2期),55-59. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2797941C1 (en) * | 2022-07-19 | 2023-06-13 | Сысоев Николай Николаевич | Method for diagnostics and quality control of a controlled object |
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| CN1924549A (en) | 2007-03-07 |
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