CN220626151U - Online electrochemical corrosion rate measuring device for boiler water wall - Google Patents
Online electrochemical corrosion rate measuring device for boiler water wall Download PDFInfo
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- CN220626151U CN220626151U CN202320193941.6U CN202320193941U CN220626151U CN 220626151 U CN220626151 U CN 220626151U CN 202320193941 U CN202320193941 U CN 202320193941U CN 220626151 U CN220626151 U CN 220626151U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000006056 electrooxidation reaction Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 5
- 238000003487 electrochemical reaction Methods 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 12
- 239000004642 Polyimide Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 210000005056 cell body Anatomy 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000000840 electrochemical analysis Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The application provides an online electrochemical corrosion rate measuring device for a boiler water wall, which comprises a water wall pipe, an electrolytic reaction tank, a liquid injection pipe, a liquid outlet pipe and a water stop valve, wherein the electrolytic reaction tank is fixedly arranged on the outer wall of the water wall pipe and contains electrolyte; the electrochemical reaction device also comprises a reference electrode, a working electrode and an auxiliary electrode which extend into the electrolytic reaction tank and are connected with the electrochemical workstation through electrode wires. By the application of the method and the device, the online electrochemical corrosion rate of the water wall pipe can be accurately measured in real time.
Description
Technical Field
The application relates to the technical field of electrochemical testing of metal pipelines of thermal power plants, in particular to an online electrochemical corrosion rate measuring device for a boiler water wall.
Background
The metal pipeline of the thermal power plant is in service for a long time under the working condition of high temperature and high pressure, and corrosion thinning becomes one of the typical failure modes. The water-cooled wall of the boiler is an evaporation heating surface of which the inner wall of the hearth consists of tube rows. The water wall is corroded by high-temperature smoke containing corrosive components for a long time in the service process, the water wall tube 1 must be prevented from being corroded in the operation of the boiler, otherwise, the heat transfer effect is affected, and tube explosion accidents can occur in severe cases. In the running process of the unit, long-term continuous monitoring is needed for grasping the corrosion condition of the water wall. However, in actual production, when the unit is in high-temperature high-pressure complex and changeable working conditions, the water wall pipe is difficult to directly check the corrosion condition of the fire side of the water wall.
The electrochemical test has the advantages of high sensitivity, strong effectiveness and the like. The electrochemical characteristic parameters change with the aging of the metal structure, so that the performance degradation degree of the metal can be judged. Therefore, electrochemical test is an effective means for monitoring the corrosion rate of the metal pipeline in the operation process of the boiler, so that the online monitoring of the corrosion rate of the metal can be realized, and theoretical basis is provided for the safety evaluation and the service life evaluation of the boiler.
At present, the electrochemical testing method commonly used for the metal materials of the thermal power plant comprises the following steps: the samples were sampled in situ and processed into test specimens and then subjected to electrochemical testing in a laboratory. The method has the advantages of higher cost, longer period, large workload and hysteresis. Patent number CN 105115888A discloses a water-cooling wall and corrosion degree monitoring device thereof, through the temperature and the flue gas atmosphere that are located of simulation water-cooling wall fire side, sets up the corrosion-simulating piece simultaneously in order to measure the corrosion behavior of water-cooling wall fire side. However, the utility model has a certain limitation that the simulation corrosion piece is arranged on the outer side of the water-cooled wall, the simulation and the real situation still have differences, and the accuracy of the electrochemical test cannot be ensured.
Therefore, how to realize the high-efficiency and high-precision detection of the online electrochemical corrosion rate of the boiler water wall is a technical problem to be solved in the field.
Disclosure of Invention
The utility model provides a boiler water-cooling wall online electrochemical corrosion rate measuring device, simple structure, the overall arrangement is compact, reasonable in design can realize the long-term real-time supervision of boiler operation in-process water-cooling wall corrosion rate, detects accurate, high efficiency.
The application provides an online electrochemical corrosion rate measuring device for a boiler water wall, which comprises a water wall pipe, an electrolytic reaction tank fixedly arranged on the outer wall of the water wall pipe and containing electrolyte, a liquid injection pipe and a liquid outlet pipe which are arranged on the outer wall of the electrolytic reaction tank, and a water stop valve arranged on the liquid injection pipe and the liquid outlet pipe; the electrochemical reaction device also comprises a reference electrode, a working electrode and an auxiliary electrode which extend into the electrolytic reaction tank and are connected with the electrochemical workstation through electrode wires.
In some embodiments, the electrolytic reaction cell comprises a cell body and a top cover covered on the top of the cell body, and the bottom edge of the cell body is fixed on the water wall pipe in a sealing way.
In some embodiments, an electrode fixing valve to fix the reference electrode, the working electrode, and the auxiliary electrode to the top cover is further included.
In some embodiments, the liquid injection pipe and the liquid outlet pipe are in sealing connection with the electrolytic reaction cell through sealing rings.
In some embodiments, the two water stop valves are electric water stop valves, and are in communication connection with an external control system.
In some embodiments, the electrolytic reaction cell is a polyimide or high temperature resistant polymer material electrolytic reaction cell.
In some embodiments, the working electrode lead outer wall is jacketed with an insulating tube.
Compared with the prior art, the online electrochemical corrosion rate measuring device for the boiler water wall has the following technical advantages:
1. the device overcomes the defect of laboratory test after on-site pipe cutting and sampling, and can realize the real-time measurement of the online electrochemical corrosion rate of the water wall pipe;
2. the measurement can be carried out under various working conditions such as long-time operation, start-up and stop, load change, deep peak regulation and the like of the boiler;
3. the surface area of the water wall pipe is used as a working electrode, so that the measuring reliability is high, the sensitivity is high, the real-time performance is good, and the accurate monitoring of the corrosion rate of the water wall can be realized;
4. simple structure, reasonable layout, high automation degree and low detection cost.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of an online electrochemical corrosion rate measuring device for a boiler water wall.
Wherein, the device comprises a 1-water wall tube, a 2-electrolytic reaction tank, a 3-liquid injection tube, a 4-water stop valve, a 5-liquid outlet tube, a 6-electrode lead, a 7-reference electrode, an 8-working electrode, a 9-auxiliary electrode, a 10-electrochemical workstation, a 11-electrode fixing valve, a 12-sealing ring and a 13-arc connecting device;
21-cell body, 22-top cap.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a schematic diagram of an online electrochemical corrosion rate measuring device for a boiler water wall provided by the present application.
The application provides an online electrochemical corrosion rate measuring device for a boiler water wall, which comprises a water wall pipe 1, an electrolytic reaction tank 2, a liquid injection pipe 3, a water stop valve 4, a liquid outlet pipe 5, an electrode lead 6, a reference electrode 7, a working electrode 8 and an auxiliary electrode 9.
The electrolytic reaction tank 2 is fixedly provided with an outer wall comprising a water wall tube 1, electrolyte is contained in the electrolytic reaction tank 2, the outer wall of the electrolytic reaction tank 2 is provided with a liquid injection tube 3 and a liquid outlet tube 5, a water stop valve 4 is arranged on the liquid injection tube 3 and the liquid outlet tube 5, a reference electrode 7, a working electrode 8 and an auxiliary electrode 9 extend into the electrolytic reaction tank 2, and are connected with an electrochemical workstation 10 through an electrode wire 6.
In one embodiment, the waterwall tube 1 is preferably, but not limited to, a SA-210C waterwall tube 1, and the gauge is not limited to Φ76mm×9mm. During processing, the lower end position of the electrolytic reaction tank 2 is processed into a groove shape matched with the water wall pipe 1 in advance, the bottom of the electrolytic reaction tank 2 is connected with the water wall pipe 1 through an arc connecting device 13 made of the same material as the water wall pipe 1, the two can be fixed in a welding connection mode and the like, and the tightness of the connection needs to be ensured. The electrolytic reaction cell 2 is preferably polyimide, and may be made of a high-temperature resistant polymer material. The solution injected into the electrolytic reaction cell 2 in this example was selected to be 5wt% NaCl solution. The liquid injection pipe 3 and the liquid outlet pipe 5 are respectively arranged at the left end and the right end of the electrolytic reaction tank 2, the water stop valves 4 are respectively arranged on the liquid injection pipe 3 and the liquid outlet pipe 5, the water stop valves 4 on the liquid injection pipe 3 control the liquid injection flow, the water stop valves 4 on the liquid outlet pipe 5 control the liquid outlet flow, and after the test is finished, the water stop valves 4 are operated to flow out the solution. The reference electrode 7 is a high temperature resistant silver/silver chloride reference electrode, the auxiliary electrode 9 is a Pt electrode with the diameter of 10mm multiplied by 10mm, and the conducting wire of the working electrode 8 is a high temperature resistant conducting wire with good conductivity. The working electrode 8 is a 10mm×10mm surface of the water wall tube 1, and the electrode lead 6 is connected to the surface of the water wall tube 1 by welding. The reference electrode 7, the auxiliary electrode 9 and the working electrode 8 are connected with a binding post of an electrochemical working station 10 through electrochemical working station leads. In this example, a GAMRY electrochemical workstation model number reference600+ was selected.
The specific monitoring steps of the measuring device are as follows:
firstly, carrying out surface treatment on a selected position on a water wall pipe 11, polishing the selected position by using a grinding wheel to be smooth, polishing the selected position by using 200# abrasive paper, 400# abrasive paper, 800# abrasive paper and 1000# abrasive paper in sequence after metal is exposed, and polishing the selected position by using No. 5 diamond polishing paste;
step two, the conducting wire of the working electrode 8 with the outer wall sleeved with the insulating tube is welded to the edge of the water wall tube 1 in a spot welding mode, and the current is guaranteed to be in a conducting state;
step three, the electrolytic reaction tank 2 is arranged on the water wall pipe 1 through the arc connecting device 13, good tightness is ensured, and the solution is ensured not to leak in the electrochemical test process;
step four, a reference electrode 7 and an auxiliary electrode 9 are placed in the electrolytic reaction tank 2, the relative positions of the reference electrode 7 and the auxiliary electrode 9 with the working electrode 8 are adjusted, the auxiliary electrode 9 is guaranteed to be opposite to the working electrode 8, the reference electrode 7 is close to the working electrode 8 as much as possible, and all the reference electrode 7, the working electrode 8 and the auxiliary electrode can not be contacted;
step five, after the position is adjusted, connecting the three electrode binding posts with an electrochemical workstation 10;
step six, closing the liquid outlet, opening the liquid injection port, and injecting the solution;
and step seven, opening the electrochemical workstation 10, and testing a polarization curve, an impedance curve and the like when the running state of the boiler is stable.
During testing, electrolyte is injected into the electrolytic reaction tank 2 from the left liquid injection port, the working electrode 8, the reference electrode 7 and the auxiliary electrode 9 in the electrolytic reaction tank 2 are connected with the electrochemical workstation 10 through the electrode lead 6, and the electrode lead 6 passes through the top cover 22 and is connected with the electrochemical workstation 10.
The measuring device overcomes the defect of laboratory test after on-site pipe cutting and sampling, and can realize the real-time measurement of the online electrochemical corrosion rate of the water wall pipe 1. The accurate measurement can be realized under various working conditions such as long-time operation, start-up and stop, variable load, deep peak regulation and the like of the boiler. The surface area of the water wall pipe 1 is used as a working electrode 8, so that the water wall corrosion rate can be accurately monitored, and the water wall pipe has good measurement reliability, high sensitivity and good real-time performance.
In one embodiment, the electrolytic reaction cell 2 comprises a cell body 21 and a top cover 22, wherein the bottom edge of the cell body 21 is fixed on the outer wall of the water wall pipe 1 in a sealing way, the top cover 22 is covered on the top of the cell body 21, and the cell body 21 and the top cover 22 can be connected through a locking piece or the top cover 22 is covered on the top of the cell body 21. The top cover 22 is made of the same material as the pool body 21, the lower end of the pool body 21 is welded with the water wall pipe 1 through the arc connecting device 13, and the welding positions are welding wires made of the water wall pipe 1.
In order to ensure the firmness of the installation of the reference electrode 7, the working electrode 8 and the auxiliary electrode 9, each electrode is fixedly installed on the top cover 22 through the electrode fixing valve 11.
The sealing ring 12 is sleeved on the outer wall of the pipe body of the liquid injection pipe 3 and the outer wall of the liquid outlet pipe 5, and the liquid injection pipe 3 and the liquid outlet pipe 5 are in sealing connection with the joint of the electrolytic reaction tank 2 through the sealing ring 12 so as to ensure the tightness of the installation position of the pipe body and the electrolytic reaction tank 2 and prevent liquid leakage.
The outer wall of the conducting wire of the working electrode 8 is sleeved with an insulating tube, and insulating protection of the working electrode 8 is realized by sealing a hard insulating tube with good insulating performance outside the conducting wire of the working electrode 8.
In addition, two stagnant water valves 4 in this application all can be manual valve or electronic stagnant water valve, when adopting electronic stagnant water valve, with the outside control system of electronic stagnant water valve communication connection, through selecting control system's button, by control system's built-in program control two stagnant water valves 4 start and stop and aperture, realize the automatic control of flow and start and stop.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The online electrochemical corrosion rate measuring device for the boiler water wall provided by the application is described in detail above. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (3)
1. The online electrochemical corrosion rate measuring device for the water-cooled wall of the boiler is characterized by comprising a water-cooled wall pipe (1), an electrolytic reaction tank (2) fixedly arranged on the outer wall of the water-cooled wall pipe (1) and used for containing electrolyte, a liquid injection pipe (3) and a liquid outlet pipe (5) which are arranged on the outer wall of the electrolytic reaction tank (2), and a water stop valve (4) which is arranged on the liquid injection pipe (3) and the liquid outlet pipe (5); the electrochemical reaction device also comprises a reference electrode (7), a working electrode (8) and an auxiliary electrode (9), wherein the reference electrode (7) extends into the electrolytic reaction tank (2) and is connected with an electrochemical workstation (10) through an electrode wire (6);
the electrolytic reaction tank (2) comprises a tank body (21) and a top cover (22) which is covered on the top of the tank body (21), and the bottom edge of the tank body (21) is fixed on the water wall pipe (1) in a sealing way;
the electrode fixing valve (11) is used for fixing the reference electrode (7), the working electrode (8) and the auxiliary electrode (9) on the top cover (22);
the liquid injection pipe (3) and the liquid outlet pipe (5) are in sealing connection with the electrolytic reaction tank (2) through a sealing ring (12);
the two water stop valves (4) are electric water stop valves and are in communication connection with an external control system.
2. The on-line electrochemical corrosion rate measuring device for the water-cooled wall of the boiler according to claim 1, wherein the electrolytic reaction tank (2) is an electrolytic reaction tank made of polyimide material.
3. The device for measuring the online electrochemical corrosion rate of the water-cooled wall of the boiler according to claim 1, wherein the outer wall of the conducting wire of the working electrode (8) is sleeved with an insulating tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320193941.6U CN220626151U (en) | 2023-01-31 | 2023-01-31 | Online electrochemical corrosion rate measuring device for boiler water wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320193941.6U CN220626151U (en) | 2023-01-31 | 2023-01-31 | Online electrochemical corrosion rate measuring device for boiler water wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220626151U true CN220626151U (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320193941.6U Active CN220626151U (en) | 2023-01-31 | 2023-01-31 | Online electrochemical corrosion rate measuring device for boiler water wall |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220626151U (en) |
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2023
- 2023-01-31 CN CN202320193941.6U patent/CN220626151U/en active Active
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