CN115372245A - High-temperature molten salt storage tank corrosion on-line monitoring method based on digital twinning technology - Google Patents
High-temperature molten salt storage tank corrosion on-line monitoring method based on digital twinning technology Download PDFInfo
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Abstract
The invention provides a high-temperature molten salt storage tank corrosion online monitoring method based on a digital twinning technology. The method utilizes a digital twinning technology to monitor the corrosion state of the molten salt storage tank and predict the wall thickness allowance of the molten salt storage tank. Compared with the prior art, the method provided by the invention is simple and convenient, can visually display the real-time wall thickness allowance of the molten salt storage tank, is beneficial to early warning of corrosion leakage of the storage tank and diagnosis of wall thickness loss and safety state of the storage tank, can effectively reduce the shutdown maintenance frequency of a unit, and realizes digital and intelligent management of high-temperature corrosion of the molten salt storage tank.
Description
Technical Field
The invention belongs to the technical field of high-temperature corrosion of metal materials, and relates to an online monitoring method for corrosion of a high-temperature molten salt storage tank, in particular to an online monitoring method for corrosion of the high-temperature molten salt storage tank based on a digital twinning technology.
Background
The molten salt heat storage is a sensible heat storage technology, has the advantages of cleanness, environmental protection, simple system structure, higher safety and stability, low investment cost and the like, and can be widely applied to the fields of thermal power flexibility transformation, heat supply, renewable energy consumption and the like.
The operating temperature range of the molten salt heat storage system is generally 200-600 ℃, and a molten salt medium has strong corrosivity in a high-temperature environment, so that the molten salt medium is easy to corrode component materials such as a molten salt storage tank, a heat transfer pipe and a heat exchanger in the system. In the long-term operation process, the fused salt storage tank part can corrode the attenuate, and then lead to the perforation to reveal the scheduling accident, cause equipment unplanned shutdown, seriously influenced heat-retaining system's security and economic nature. Therefore, the corrosion condition of the high-temperature molten salt storage tank needs to be monitored on line so as to ensure the safe and reliable operation of the heat storage system. At present, the corrosion condition of high-temperature component materials is mainly detected by technical means such as regular shutdown and pipe cutting or nondestructive detection, and the methods all have the problems of time and labor waste, incapability of real-time continuous monitoring and the like.
CN102235966A discloses a system and method for online monitoring of molten salt corrosion, comprising first and second electrodes electrically insulated from each other within a component and exposed to the corrosive operating environment of the equipment. The first and second electrodes are electrically coupled such that when a potential difference exists between the first and second electrodes, an electrical current flows between the first electrode and the second electrode. The potential difference between the first electrode and the second electrode is based at least in part on molten salt corrosion at the first electrode or the second electrode. At least one of a potential difference between the first electrode and the second electrode or a current flowing between the first electrode and the second electrode is measured and analyzed so that a corrosion characteristic of the component can be predicted. However, the method is influenced by the flowing environment, the accuracy is poor, the high-temperature molten salt corrosion resistance of the electrode material is limited, and the high-temperature molten salt corrosion monitoring cannot be continuously carried out.
CN113630582A discloses a visual online monitoring device suitable for high temperature molten salt environment, it includes the high temperature molten salt endoscope that can stretch into in the high temperature molten salt, the major diameter sleeve is fixed on the sleeve flange, the minor diameter sleeve runs through sleeve flange movable mounting in the inside of major diameter sleeve, form annular cooling gas flow space between major diameter sleeve and the minor diameter sleeve, the observation window is the printing opacity material of fixed connection at the telescopic foremost of minor diameter, video fiber extends and connects the observation window in the telescopic inside of minor diameter, form annular inert gas flow space between minor diameter sleeve and the video fiber. Although the corrosion condition can be visually observed, the method can not realize long-time continuous detection, and the corrosion condition is manually judged through a video, so that misjudgment is easy to occur, and serious consequences are caused.
In summary, how to provide a method for real-time monitoring and accurate evaluation of the physical corrosion condition of a high-temperature molten salt storage tank becomes a problem to be solved at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a high-temperature molten salt storage tank corrosion online monitoring method based on a digital twinning technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a digital twinning technology-based online monitoring method for corrosion of a high-temperature molten salt storage tank, which comprises the following steps:
(1) Carrying out a simulated molten salt corrosion test on the storage tank material, and fitting a corrosion dynamics rule of the storage tank material in a simulated molten salt environment according to test data;
(2) Testing the electrochemical impedance spectrum of the storage tank material in a simulated molten salt environment by using an electrochemical impedance probe, and calculating the polarization resistance, the corrosion layer resistance and the corrosion rate of the storage tank material;
(3) Establishing a corrosion depth model of the storage tank material according to the corrosion temperature, the corrosion time, the resistance of the corrosion layer, the polarization resistance, the corrosion dynamics rule and the relation between the corrosion rate and the corrosion depth;
(4) Installing a sensor matrix group in the storage tank for real-time sampling, and establishing a digital twin model of the storage tank material by combining the corrosion depth model in the step (3);
(5) And modifying and iterating the digital twin model by using offline detection data, so that self-learning updating of the digital twin model is realized, and the accuracy and reliability of a monitoring result are improved.
According to the online monitoring method for the corrosion of the high-temperature molten salt storage tank, a digital twinning technology is utilized, the relation between the digital simulation and the actual corrosion process of the molten salt corrosion of the high-temperature molten salt storage tank is established through the mutual combination of a physical model, real-time monitoring data and a molten salt corrosion database, and then the self-learning updating of the digital twinning model is carried out by applying the actual corrosion depth data of the molten salt storage tank, so that the real-time monitoring and the accurate evaluation of the entity corrosion condition of the high-temperature molten salt storage tank are realized.
In the present invention, "high temperature" in the high temperature molten salt means a temperature range of 400 to 650 ℃. Steps (1) to (2) are simulation experiments under laboratory conditions.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferred technical scheme of the invention, the step (1) comprises respectively carrying out the simulated molten salt corrosion tests on the storage tank materials at different temperatures, wherein the different temperatures comprise at least 2 temperatures, such as 2, 3, 4, 5 or 6, and the like, but the different temperatures are not limited to the values listed, and other values not listed in the range of the values are also applicable.
In the invention, a molten salt corrosion test is simulated, namely a corrosion test of taking a plurality of fresh storage tank material samples respectively, wherein each sample corresponds to a time point at a temperature. Corrosion tests at temperatures of at least 3 temperatures are generally selected.
As a preferable technical scheme of the invention, the method for obtaining the corrosion kinetic law of the storage tank material in the step (1) comprises the following steps: according to the relation between corrosion weight LOSS delta LOSS of the storage tank material and corrosion time t and the corrosion rate constant k of the storage tank material p And obtaining the cumulative corrosion weight LOSS LOSS of the storage tank material after corrosion in the simulated molten salt environment at different temperatures according to the relation of the corrosion temperature T.
Preferably, the corrosion weight LOSS Δ LOSS and corrosion time t of the storage tank material are related as follows:
wherein, the delta M is the corrosion weight loss, mg, of the storage tank material; s is the total surface area of the sample in cm 2 ；k p As corrosion rate constant, mg 2 /cm 4 /h。
Preferably, the corrosion rate constant k of the tank material p And the corrosion temperature T is:
wherein k is p (T) is the corrosion rate constant at T temperature, mg 2 /cm 4 /h；K 0 Is a pre-dactylotic factor, mg 2 /cm 4 H; e is activation energy, J/mol; r is a molar gas constant, J/(mol.K); t is the corrosion temperature, DEG C.
Preferably, the calculation process of the cumulative corrosion weight LOSS after the storage tank material is corroded in the simulated molten salt environment at different temperatures comprises the following steps:
case (1): no spalling of corrosion products
a. The corrosion process is divided into different stages according to the temperature variation, i.e. (T) 1 ，t 1 )、(T 2 ，t 2 )、…、(T m ，t m )；
b. Calculating the cumulative corrosion weight LOSS LOSS of the 1 st stage 1 ：
c. Converting the accumulated corrosion weight loss of the 1 st stage into the equivalent corrosion time t of the 2 nd stage 2 ′：
d. Calculating the cumulative corrosion weight LOSS LOSS of the first 2 stages 2 ：
e. Converting the accumulated corrosion weight loss of the first 2 stages into the equivalent corrosion time t of the first 3 stages 3 ′：
f. Calculating the cumulative corrosion weight LOSS LOSS of the first 3 stages 3 ：
g. By analogy, the cumulative corrosion weight LOSS LOSS of the storage tank material after m stages is obtained m ：
Case (2): corrosion products in (T) i ，t i ) Staged exfoliation, and i<m
Among them, LOSS i The accumulated corrosion weight loss before the peeling of the corrosion product is obtained by calculation according to the formula (3) to the formula (8); a and b are correction parameters, Δ t i Is the run time after the exfoliation in phase i.
As a preferable technical scheme of the invention, the electrochemical impedance probe in the step (2) is a two-electrode system, namely comprises a first electrode and a second electrode.
Preferably, the first electrode is a working electrode and the second electrode comprises a reference electrode and a counter electrode.
Preferably, the material of the working electrode is the same as the material of the storage tank.
In the invention, the electrochemical impedance probe adopts a double-electrode system, a first electrode is used as a Working Electrode (WE), a second electrode is used as a Reference Electrode (RE) and a Counter Electrode (CE), the first electrode and the second electrode are respectively welded with Fe-Cr-Al wire materials and then encapsulated in a ceramic tube, and high-temperature-resistant filler is filled in the ceramic tube. Before testing, 2000# abrasive paper is used for polishing to remove oxide skin on the surface of the electrode.
As a preferable technical scheme of the invention, the step (2) utilizes an equivalent circuit method to fit to obtain the polarization resistance R according to the electrochemical impedance spectrum p Corrosion layer resistance R ox And corrosion current density CR.
Preferably, the equivalent circuit method includes: establishing an equivalent circuit diagram according to the electrochemical impedance spectrum data by using impedance spectrum fitting software, and then fitting to obtain the polarization resistance R by combining with an equivalent circuit impedance expression p Corrosion layer resistance R ox And corrosion current density CR.
As a preferable technical solution of the present invention, the polarization resistor R p The calculation formula of (2) is as follows:
R p ≈R t +Z W formula (10)
Wherein R is t Is a charge transfer resistance of omega cm 2 ；Z W Is diffusion resistance, omega cm 2 ；
Preferably, the formula for calculating the corrosion rate CR includes:
firstly, calculating to obtain the instantaneous corrosion current density i corr ：
Wherein B is a Stern constant;
wherein i corr Is corrosion current density, A/cm 2 (ii) a M is the molar mass of the material, g/mol; beta is the number of gain and loss electrons; f is Faraday constant, C/mol; rho is the density of the material, g/cm 3 。
In the invention, the equivalent circuit method needs to establish an equivalent circuit diagram according to electrochemical impedance data, then matches a proper equivalent circuit impedance expression, and obtains the charge transfer resistance R by using impedance spectrum fitting software t Diffusion resistance Z W And corrosion layer resistance R ox Then, according to the formulas (10) - (12), the polarization resistance R can be obtained p And corrosion current density CR.
Based on the mathematical derivation, the corrosion temperature T, the corrosion time T and the corrosion layer resistance R are selected ox And a polarization resistance R p As a group of input signals, selecting the corrosion depth delta H of the molten salt storage tank material as an output signal, and establishing the corrosion temperature T, the corrosion time T and the corrosion layer resistance R ox And a polarization resistance R p And a physical model between the corrosion depth delta H, and continuously debugging and correcting parameters of the molten salt storage tank corrosion depth model by using a molten salt corrosion database (namely a corrosion dynamics rule and a corrosion rate) obtained in a laboratory so as to achieve the consistency of input and output.
As a preferred technical scheme of the invention, the process for establishing the corrosion depth model in the step (3) comprises the following steps:
I. inputting the operating temperature, the operating time, the corrosion layer resistance and the polarization resistance of the storage tank, and calculating the accumulated corrosion weight loss and the corrosion rate;
II, judging whether the corrosion product on the surface of the storage tank is peeled off or not by combining a molten salt corrosion database obtained in a laboratory according to the corrosion rate and the corrosion layer resistance, namely whether the corrosion rate and the corrosion layer resistance are abnormally increased or decreased in the monitoring process or not;
if the peeling does not occur, calculating the corrosion depth according to the accumulated corrosion weight loss [ obtained by calculating the formula (3) -the formula (8) ];
and if the peeling occurs, correcting the accumulated corrosion weight loss according to a molten salt corrosion database obtained in a laboratory (namely formula (9)), and then calculating the corrosion depth.
As a preferable technical scheme of the invention, the electrochemical impedance probe which is the same as the electrochemical impedance probe in the step (2) is arranged in the sampling point of the sensor matrix group in the step (4).
Preferably, a thermocouple is further arranged in the sampling point of the sensor matrix group in the step (4).
As a preferable technical scheme of the invention, the density of the sampling points in the sensor matrix group is 3-6/m 2 E.g. 3/m 2 4 pieces/m 2 5 pieces/m 2 Or 6/m 2 And the like, but are not limited to the recited values, and other unrecited values within the numerical range are also applicable.
As a preferable technical scheme of the invention, the offline monitoring data in the step (5) refers to the wall thickness change data of the storage tank obtained by shutdown manual overhaul, namely the offline data Delta H' of the wall thickness reduction of the molten salt storage tank.
Compared with the prior art, the invention has the following beneficial effects:
according to the method for monitoring the corrosion of the high-temperature molten salt storage tank on line, the matrix type temperature sensor and the electrochemical impedance probe are arranged in the molten salt storage tank, and a real-time data-driven molten salt storage tank digital twinning model is established by using data acquired by the sensor and a molten salt corrosion test database. Compared with the prior art, the online monitoring method provided by the invention is simple and convenient, can visually display the real-time wall thickness allowance of the molten salt storage tank, is beneficial to early warning of corrosion leakage of the storage tank and diagnosis of wall thickness loss and safety state of the storage tank, can effectively reduce the shutdown maintenance frequency of a unit, and realizes digital and intelligent management of high-temperature corrosion of the molten salt storage tank.
Drawings
Fig. 1 is an equivalent circuit diagram obtained by fitting according to electrochemical impedance data in the method for online monitoring of corrosion of a high-temperature molten salt storage tank based on a digital twinning technique provided in embodiment 1 of the present invention.
Fig. 2 is a flow chart of establishing a corrosion depth model in the method for monitoring corrosion of a high-temperature molten salt storage tank on line based on a digital twinning technique, which is provided by embodiment 1 of the invention.
Detailed Description
In order to better explain the present invention and to facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a digital twinning technology-based online monitoring method for corrosion of a high-temperature molten salt storage tank, which comprises the following steps:
347H of the selected storage tank material, simulated molten salt composition 60wt% NaNO 3 +40wt％KNO 3 ；
(1) In laboratory conditions, corrosion tests were conducted on 347H material in Solar Salt molten Salt environments at different temperatures (450 deg.C, 500 deg.C, 550 deg.C, 600 deg.C, and 650 deg.C) for up to 3000 hours, resulting in 347H corrosion rate constants at different temperatures, with the results shown in Table 1:
TABLE 1
| Test temperature/. Degree.C | 450 | 500 | 550 | 600 | 650 |
| Corrosion rate constant/(mg) 2 /cm 4 /h) | 1.8×10 -6 | 2.8×10 -6 | 3.1×10 -5 | 3.2×10 -4 | 6.1×10 -4 |
Obtaining a corrosion rate constant k by data fitting p And corrosion temperature T:
then according to the actual operation condition of the storage tank, calculating the accumulated corrosion LOSS LOSS of the storage tank material after corrosion in molten salt environments with different temperatures, wherein no corrosive is peeled off, and the calculation process comprises the following steps:
a. the corrosion process is divided into different stages according to the temperature variation, i.e. (T) 1 ，t 1 )、(T 2 ，t 2 )、…、(T m ，t m )；
b. Calculating the cumulative corrosion weight LOSS LOSS of the 1 st stage 1 ：
c. Converting the accumulated corrosion weight loss of the 1 st stage into the equivalent corrosion time t of the 2 nd stage 2 ′：
d. Calculating the cumulative corrosion weight LOSS LOSS of the first 2 stages 2 ：
e. Converting the accumulated corrosion weight loss of the first 2 stages into the equivalent corrosion time t of the first 3 stages 3 ′：
f. Calculating the cumulative corrosion weight LOSS LOSS of the first 3 stages 3 ：
g. By analogy, the real-time accumulated weight LOSS LOSS of the storage tank m Comprises the following steps:
(2) Testing electrochemical impedance spectrum of storage tank material corroded for different time in simulated molten salt environment at different temperatures by using electrochemical impedance probe, fitting to obtain equivalent circuit diagram, as shown in FIG. 1, and combining equivalent electricityThe impedance expression is obtained by using impedance spectrum fitting software to obtain the charge transfer resistance, the diffusion resistance and the corrosion layer resistance, and the instantaneous corrosion current densities i at different time points of 450 ℃, 550 ℃ and 600 ℃ are respectively calculated according to the formulas (10) to (12) corr And corrosion rate CR, results are shown in table 2:
TABLE 2
Wherein, the equivalent circuit impedance expression is:
wherein R is s Is a molten salt resistance, R t Is a charge transfer resistance, R ox Resistance to corrosion layer, C ox Is the corrosion product layer capacitance, C dl Is an electric double layer capacitor, Z w For diffusion resistance, ω is frequency, and j is imaginary operator
And n ox Are respectively C dl And C ox The dispersion coefficient of (a);
(3) Establishing a corrosion depth model of the storage tank material according to the corrosion temperature, the corrosion time, the corrosion layer resistance, the polarization resistance, the corrosion dynamics law and the relation between the corrosion rate and the corrosion depth obtained in the steps (1) to (2), wherein a flow chart is shown in figure 2;
(4) A thermocouple and an electrochemical impedance probe are arranged inside the molten salt storage tank, a sensor matrix group is arranged, and the density of sampling points in the matrix group is 4/m 2 (ii) a Real-time data collected using a set of sensor matrices and a database obtained under laboratory conditions [ i.e. according to steps (1) - (2)]Establishing a real-time data-driven molten salt storage tank digital twin model based on the obtained data and the corrosion depth model obtained in the step (3);
(5) Obtaining wall thickness reduction off-line data of the molten salt storage tank when the molten salt storage tank is shut down and manually overhauled, and continuously correcting and iterating the digital twin model until the error between the two is controlled to be 4 percent, so that the corrosion condition of the molten salt storage tank is accurately monitored.
The present invention is illustrated in detail by the examples given above, but the present invention is not limited to the details given above, which means that the present invention is not limited to the details given above. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents to the operation of the invention, additions of additional operations, selection of specific ways, etc., are within the scope and disclosure of the invention.
Claims (10)
1. A high-temperature molten salt storage tank corrosion on-line monitoring method based on a digital twinning technology is characterized by comprising the following steps:
(1) Carrying out a simulated molten salt corrosion test on the storage tank material, and fitting a corrosion dynamics rule of the storage tank material in a simulated molten salt environment according to test data;
(2) Testing the electrochemical impedance spectrum of the storage tank material in a simulated molten salt environment by using an electrochemical impedance probe, and calculating the polarization resistance, the corrosion layer resistance and the corrosion rate of the storage tank material;
(3) Establishing a corrosion depth model of the storage tank material according to the corrosion temperature, the corrosion time, the resistance of a corrosion layer, the polarization resistance, the corrosion dynamics rule and the relation between the corrosion rate and the corrosion depth;
(4) Installing a sensor matrix group in the storage tank for real-time sampling, and establishing a digital twin model of the storage tank material by combining the corrosion depth model in the step (3);
(5) And modifying and iterating the digital twin model by using offline detection data to realize self-learning updating of the digital twin model.
2. A high temperature molten salt storage tank corrosion on-line monitoring method as claimed in claim 1, wherein step (1) includes performing simulated molten salt corrosion tests on the storage tank material at different temperatures respectively, the different temperatures including at least 2 temperatures.
3. The on-line monitoring method for corrosion of the high-temperature molten salt storage tank according to claim 2, wherein the method for obtaining the dynamic law of corrosion of the storage tank material in the step (1) comprises the following steps: according to the relation between corrosion weight LOSS delta LOSS of the storage tank material and corrosion time t and the corrosion rate constant k of the storage tank material p Obtaining the accumulated corrosion weight LOSS LOSS of the storage tank material after corrosion in simulated molten salt environments at different temperatures according to the relation with the corrosion temperature T;
preferably, the corrosion weight LOSS Δ LOSS and corrosion time t of the storage tank material are in the following relationship:
wherein, the delta M is the corrosion weight loss, mg, of the storage tank material; s is the total surface area of the sample in cm 2 ；k p As corrosion rate constant, mg 2 /cm 4 H; t is time, h;
preferably, the corrosion rate constant k of the tank material p And the corrosion temperature T is:
wherein k is p (T) is the corrosion rate constant at T temperature, mg 2 /cm 4 /h；K 0 Is a pre-dactylotic factor, mg 2 /cm 4 H; e is activation energy, J/mol; r is a molar gas constant, J/(mol.K); t is the corrosion temperature, DEG C;
preferably, the calculation process of the cumulative corrosion weight LOSS after the storage tank material is corroded in the simulated molten salt environment at different temperatures comprises the following steps:
case (1): no spalling of corrosion products occurs
a. The etching process is divided into different stages according to the change of temperature, i.e. (), (T 1 ，t 1 )、(T 2 ，t 2 )、…、(T m ，t m )；
b. Calculating the cumulative corrosion weight LOSS LOSS of the 1 st stage 1 ：
c. Converting the accumulated corrosion weight loss of the 1 st stage into the equivalent corrosion time t of the 2 nd stage 2 ′：
d. Calculating the cumulative corrosion weight LOSS LOSS of the first 2 stages 2 ：
e. Converting the accumulated corrosion weight loss of the first 2 stages into the equivalent corrosion time t of the first 3 stages 3 ′：
f. Calculating the cumulative corrosion weight LOSS LOSS of the first 3 stages 3 ：
g. By analogy, the accumulated corrosion weight LOSS LOSS of the storage tank material after m stages is obtained m ：
Case (2): corrosion products in (T) i ，t i ) Stage by stage, and i<m：
Among them, LOSS i The accumulated corrosion weight loss before the corrosion product is peeled off is obtained by calculation according to the formula (3) to the formula (8); a and b are correction parameters, Δ t i Is the run time after the exfoliation in phase i.
4. The on-line monitoring method for corrosion of the high-temperature molten salt storage tank according to any one of claims 1-3, wherein the electrochemical impedance probe in the step (2) is a two-electrode system, namely, a first electrode and a second electrode;
preferably, the first electrode is a working electrode and the second electrode comprises a reference electrode and a counter electrode.
5. The on-line monitoring method for corrosion of a high-temperature molten salt storage tank according to claim 4, wherein the working electrode is made of the same material as the storage tank.
6. The on-line monitoring method for corrosion of the high-temperature molten salt storage tank according to any one of claims 1-5, characterized in that in the step (2), according to the electrochemical impedance spectrum, the polarization resistance R is obtained by fitting with an equivalent circuit method p Corrosion layer resistance R ox And corrosion current density CR;
preferably, the equivalent circuit method includes: establishing an equivalent circuit diagram according to the electrochemical impedance spectrum data, and then combining an equivalent circuit impedance expression to obtain a polarization resistance R through fitting p Corrosion layer resistance R ox And corrosion current density CR.
7. The on-line monitoring method for corrosion of high-temperature molten salt storage tank according to claim 6, characterized in that the polarization resistance R p Is calculated by the formula：
R p ≈R t +Z W Formula (10)
Wherein R is t Is a charge transfer resistance of omega cm 2 ；Z W Is diffusion resistance, omega cm 2 ；
Preferably, the formula for calculating the corrosion rate CR includes:
firstly, calculating to obtain instantaneous corrosion current density i corr ：
Wherein B is a Stern constant;
wherein i corr Is corrosion current density, A/cm 2 (ii) a M is the molar mass of the material, g/mol; beta is the number of gain and loss electrons; f is Faraday constant, C/mol; rho is the density of the material, g/cm 3 。
8. The on-line monitoring method for corrosion of the high-temperature molten salt storage tank according to any one of claims 1-7, characterized in that the same electrochemical impedance probe as that in the step (2) is arranged in the sampling point of the sensor matrix group in the step (4);
preferably, thermocouples are further arranged in sampling points of the sensor matrix group in the step (4).
9. The high-temperature molten salt storage tank corrosion online monitoring method according to claim 8, wherein the density of sampling points in the sensor matrix group is 3-6/m 2 。
10. The on-line monitoring method for corrosion of the high-temperature molten salt storage tank according to any one of claims 1-9, wherein the off-line monitoring data in the step (5) is storage tank wall thickness change data obtained by manual maintenance during shutdown.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554277A (en) * | 2024-01-11 | 2024-02-13 | 北京工业大学 | External corrosion acceleration test device considering internal pressure of buried water supply pipeline |
| CN117686418A (en) * | 2024-01-31 | 2024-03-12 | 中国特种设备检测研究院 | Coupling probe, method and system for detecting instant and accumulated corrosion rate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554277A (en) * | 2024-01-11 | 2024-02-13 | 北京工业大学 | External corrosion acceleration test device considering internal pressure of buried water supply pipeline |
| CN117554277B (en) * | 2024-01-11 | 2024-03-29 | 北京工业大学 | External corrosion acceleration test device considering internal pressure of buried water supply pipeline |
| CN117686418A (en) * | 2024-01-31 | 2024-03-12 | 中国特种设备检测研究院 | Coupling probe, method and system for detecting instant and accumulated corrosion rate |
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