All-region electrochemical real-time monitoring system for metal tube in different flow states

Abstract

The invention discloses a metal pipe full-area electrochemical real-time monitoring system under different flow regimes, which comprises a liquid storage device, an electrochemical monitoring device and a waste liquid treatment device, the liquid storage device is communicated with a power pump through a flow meter, the electrochemical monitoring device comprises an elbow pipeline, an electrode assembly and a multi-channel electrochemical workstation, the electrode assembly is arranged on the elbow pipeline, the multi-channel electrochemical workstation is connected with the electrode assembly, the power pump is communicated with the first backflow auxiliary pipe section through the elbow pipeline, and the inclination angle of the elbow pipeline relative to the horizontal plane is adjustable. The first backflow auxiliary pipe section is communicated with the inlet end of the waste liquid treatment device, the outlet end of the waste liquid treatment device is communicated with the second backflow auxiliary pipe section through a backflow pump, and the second backflow auxiliary pipe section is communicated with a backflow opening of the liquid storage device. The system can realize electrochemical real-time monitoring of all areas of the metal tube under different flow states and different impact speeds.

Description

Technical Field

[0001] The invention relates to the technical field of electrochemical analysis of wear and corrosion of oil well pipes, and in particular to a full-area electrochemical real-time monitoring system for metal pipes under different flow states. Background Art

[0002] For downhole tubing, there may be varying degrees of inclination in the deflection section due to environmental constraints. Therefore, in addition to conventional horizontal and vertical flows, the liquid in the wellbore may also experience the synergistic effect of horizontal and vertical flows. Due to the complex stress distribution of tubing components in the deflection section and the large changes in regional liquid flow patterns, erosion and corrosion of the pipe wall are severe. Currently, the main research methods for wear and corrosion of tubing components are weight loss method and electrochemical method. The weight loss method has an intuitive display effect on the severity of wear and corrosion, but it is obviously insufficient for mechanism research. In addition, in actual working conditions, the formation and destruction of the corrosion layer occur simultaneously, so synchronous research is more important.

[0003] Currently, devices used to study wear and corrosion fall into three main categories: rotating disk electrode devices, pipeline devices, and jet devices. Rotating disk electrode devices are simple and inexpensive, but fluid velocities should be limited. Jet devices can precisely control the impact angle, resulting in higher impact velocities, but their disadvantage is that they differ significantly from actual operating conditions. Pipeline devices can effectively simulate the movement of fluids in pipes, but they require a large amount of fluid. Furthermore, currently developed testing systems struggle to simulate the wear and corrosion of different parts of metal pipes under different flow regimes. Therefore, it is crucial to develop a cost-effective and practical research system that can accurately and comprehensively simulate the actual operating conditions of a pipe string. Summary of the Invention

[0004] The purpose of the present invention is to provide a real-time electrochemical monitoring system for the entire area of ​​metal pipes under different flow states in response to the above-mentioned shortcomings in the current research on wear and corrosion of downhole pipes. The system has the advantages of accurate test data, easy use, low cost and easy promotion.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention provides a full-area electrochemical real-time monitoring system for a metal pipe under different flow states, comprising a liquid storage device, an electrochemical monitoring device and a waste liquid treatment device. The liquid storage device is connected to a power pump through a flow meter. The electrochemical monitoring device comprises an elbow pipe, an electrode assembly and a multi-channel electrochemical workstation. The electrode assembly is arranged on the elbow pipe, and the multi-channel electrochemical workstation is connected to the electrode assembly. The power pump is connected to a reflux auxiliary pipe section 1 through the elbow pipe, and the inclination angle of the elbow pipe relative to the horizontal plane is adjustable. The reflux auxiliary pipe section 1 is connected to the inlet end of the waste liquid treatment device, and the outlet end of the waste liquid treatment device is connected to the reflux auxiliary pipe section 2 through a reflux pump, and the reflux auxiliary pipe section 2 is connected to the reflux port of the liquid storage device.

[0007] In some embodiments, the electrode assembly includes a research electrode, an auxiliary electrode, and a reference electrode. There are multiple research electrodes, and the multiple research electrodes are evenly distributed along the axial and circumferential directions of the elbow pipe.

[0008] In some embodiments, a flange connection structure is provided between the outlet end of the power pump and the connection end of the elbow pipe, and the flange connection structure enables the inclination angle of the elbow pipe relative to the horizontal plane to be adjustable.

[0009] In some embodiments, the flange connection structure includes a pipe joint connected to the power pump, and an elbow flange provided at the end of the elbow pipe. The end of the pipe joint is provided with a pipe joint flange, and the pipe joint flange and the elbow flange are both provided with multiple fixing holes correspondingly along the circumference.

[0010] In some embodiments, the liquid storage device includes a liquid storage tank, a liquid outlet and a liquid inlet, the liquid outlet is connected to the inlet end of the flow meter, and the liquid inlet is connected to the second reflux auxiliary pipe section.

[0011] In some embodiments, a limit liquid line is marked on the side wall of the liquid storage tank, and the amount of solution below the limit liquid line should be no less than the amount of solution required for five minutes of corrosive wear.

[0012] In some embodiments, the liquid storage device further includes a liquid shortage alarm component, and the liquid shortage alarm component is used to issue an alarm prompt when the liquid level of the liquid storage tank is at the limit liquid line.

[0013] In some embodiments, the waste liquid treatment device includes a treatment box, a reflux liquid inlet end, a reflux liquid outlet end and a filter screen assembly. The reflux liquid inlet end is connected to the reflux auxiliary pipe section, and the reflux liquid outlet end is connected to the inlet end of the reflux pump. The filter screen assembly is used to intercept iron chips formed during the wear process.

[0014] In some embodiments, the filter assembly includes multiple layers of magnetic filter screens disposed on the bottom wall of the processing box. The multiple layers of magnetic filter screens have different heights and are arranged in sequence from low to high according to the flow direction of the reflux liquid.

[0015] In some embodiments, the waste liquid treatment device further includes an overflow alarm component, which is used to issue an alarm when the liquid level of the treatment box is at an anti-overflow line.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] The monitoring system of the present invention can realize real-time electrochemical monitoring of all areas of the metal pipe under different flow states and different impact velocities, as well as the study of the degree and mechanism of wear-corrosion interaction in different areas. It has the advantages of accurate test data, easy use, low cost, and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0019] Figure 1 Schematic diagram of the full-area electrochemical real-time monitoring system of a metal tube under different flow regimes in the present invention;

[0020] FIG2( a ) is a schematic structural diagram of a liquid storage device according to the present invention;

[0021] Figure 2(b) is a cross-sectional view of the liquid storage tank structure of the present invention;

[0022] FIG3( a ) is a schematic structural diagram of an electrochemical monitoring device according to the present invention;

[0023] FIG3( b ) is a diagram showing the distribution of fixing holes on the pipe joint flange and elbow flange of the present invention;

[0024] FIG3( c ) is a diagram showing the distribution of electrode jacks on the elbow pipe of the present invention;

[0025] FIG4( a ) is a schematic diagram of the combined structure of the research electrode sleeve and the research electrode in the present invention;

[0026] FIG4( b ) is a cross-sectional view of the structure of the research electrode sleeve in the present invention;

[0027] FIG5( a ) is a schematic structural diagram of a waste liquid treatment device according to the present invention;

[0028] FIG5( b ) is a cross-sectional view of the processing box structure in the present invention.

[0029] Markings and corresponding parts names in the accompanying drawings:

[0030] 1-Liquid storage device; 2-Flow meter; 3-Power pump; 4-Electrochemical monitoring device; 5-Backflow auxiliary pipe section 1; 6-Waste liquid treatment device; 7-Backflow pump; 8-Backflow auxiliary pipe section 2; 9-Suspension line 1; 10-Switch 1; 11-Alarm 1; 12-Power supply 1; 13-Float 1; 14-Liquid outlet; 15-Liquid limit line; 16-Liquid storage tank; 17-Liquid inlet; 18-Pipe joint; 19-Pipe joint flange; 20-Gasket; 21-Elbow flange; 22-Elbow pipe; 23-Research electric Electrode socket; 24-research electrode; 25-auxiliary tube; 26-auxiliary electrode; 27-reference electrode; 28-multi-channel electrochemical workstation; 29-research electrode sleeve; 30-silicone rubber; 31-research electrode sample; 32-lead; 33-sealing gasket; 34-suspension wire 2; 35-switch 2; 36-alarm 2; 37-power supply 2; 38-float 2; 39-reflux liquid outlet; 40-anti-splash baffle; 41-processing box; 42-magnetic filter; 43-anti-overflow line; 44-reflux liquid inlet. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0034] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0036] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0040] Please refer to Figure 1 As to Figure 5, an embodiment of the present application provides a full-area electrochemical real-time monitoring system for metal pipes under different flow states, including a liquid storage device 1, an electrochemical monitoring device 4 and a waste liquid treatment device 6. The liquid storage device 1 is connected to the power pump 3 through a flow meter 2, and the electrochemical monitoring device 4 includes an elbow pipe 22, an electrode assembly and a multi-channel electrochemical workstation 28. The electrode assembly is arranged on the elbow pipe 22, and the multi-channel electrochemical workstation 28 is connected to the electrode assembly. The power pump 3 is connected to the reflux auxiliary pipe section 1 5 through the elbow pipe 22, and the inclination angle of the elbow pipe 22 relative to the horizontal plane is adjustable. The reflux auxiliary pipe section 1 5 is connected to the inlet end of the waste liquid treatment device 6, and the outlet end of the waste liquid treatment device 6 is connected to the reflux auxiliary pipe section 2 8 through the reflux pump 7, and the reflux auxiliary pipe section 2 8 is connected to the reflux port of the liquid storage device 1.

[0041] After passing through flowmeter 2, the corrosive liquid from liquid storage device 1, driven by power pump 3, flows at a set rate through elbow pipe 22 in electrochemical monitoring device 4. Research electrode 24, auxiliary electrode 26, reference electrode 27, and multi-channel electrochemical workstation 28 collectively monitor the full-area electrochemical performance of the research electrode in real time. The multiphase flow from elbow pipe 22 flows through auxiliary reflux pipe section 1-5 and enters waste liquid treatment device 6. After being filtered by waste liquid treatment device 6, the corrosive liquid is returned to liquid storage device 1 by reflux pump 7.

[0042] According to some embodiments of the present application, the electrode assembly includes a research electrode 24, an auxiliary electrode 26 and a reference electrode 27. There are multiple research electrodes 24, and the multiple research electrodes 24 are evenly distributed along the axial and circumferential directions of the elbow pipe 22. The multiple research electrodes 24 are connected to the multi-channel electrochemical workstation 28.

[0043] According to some embodiments of the present application, a plurality of research electrode sockets 23 are provided at different angles on the pipe wall and interface of the elbow pipe 22, and a plurality of research electrodes 24 are respectively installed in the plurality of research electrode sockets 23. Specifically, the elbow pipe 22 is divided into 10 evenly spaced cross sections along its length, and 10 research electrode sockets 23 are evenly distributed along the circumference of each cross section. Therefore, there are a total of 100 research electrode sockets 23 on the elbow pipe 22, and each research electrode 24 is installed in a research electrode socket 23, thereby achieving full-area monitoring of the metal elbow pipe.

[0044] According to some embodiments of the present application, the research electrode 24 is installed in the research electrode sleeve 29, and the research electrode sleeve 29 is fixed in the research electrode socket 23. Specifically, the research electrode sample 31 is fixed in the research electrode sleeve 29 in a tight sealing manner, and the copper wire 32 welded at the rear end of the research electrode sample 31 passes through the small hole at the rear end of the research electrode sleeve 29 and is connected to the multi-channel electrochemical workstation 28. The research electrode sleeve 29 is made of corrosion-resistant polytetrafluoroethylene material, and the research electrode sleeve 29 is fixed to the research electrode socket 23 on the elbow pipe 22 by an external thread. A sealing gasket 33 is used to strengthen the seal between the inlet end of the research electrode socket 23 and the contact surface of the research electrode sleeve 29. In order to ensure that no liquid penetrates into the research electrode sleeve 29 during the test, silicone rubber 30 is used to seal the gap between the research electrode sample 31 and the inner wall of the mounting hole on the research electrode sleeve 29.

[0045] According to some embodiments of the present application, an auxiliary tube 25 is provided on the side wall of the elbow pipe 22 near the outlet end, and the auxiliary tube 25 is connected to the inner cavity of the elbow pipe 22. The auxiliary electrode 26 and the reference electrode 27 are arranged in the auxiliary tube 25, and the auxiliary electrode 26 and the reference electrode 27 are connected to the multi-channel electrochemical workstation 28.

[0046] According to some embodiments of the present application, a flange connection structure is provided between the outlet end of the power pump 3 and the connecting end of the elbow pipe 22, and the flange connection structure makes the inclination angle of the elbow pipe 22 relative to the horizontal plane adjustable, thereby simulating the fluid conditions at different inclination angles.

[0047] According to some embodiments of the present application, the flange connection structure includes a pipe joint 18 connected to the power pump 3, and an elbow flange 21 provided at the end of the elbow pipe 22. The end of the pipe joint 18 is provided with a pipe joint flange 19, and the pipe joint flange 19 and the elbow flange 21 are both provided with a plurality of fixing holes corresponding to each other along the circumference. Specifically, the shape of the fixing holes is a concentric arc, and the central angle corresponding to the arc length of a single hole is 10°. The position of the opening can refer to the accompanying drawings. When in use, by rotating the elbow pipe 22 circumferentially around the connection center of the pipe joint flange 19 and the elbow flange 21, the inclination angle of the elbow pipe 22 relative to the horizontal plane can be changed, for example, the elbow pipe 22 is changed from a horizontal state to a vertical state (at this time, the outlet end axis of the elbow pipe 22 is vertical). In order to improve the sealing between the pipe joint flange 19 and the elbow flange 21, a gasket 20 is provided between the butt surfaces of the two.

[0048] According to some embodiments of the present application, the liquid storage device 1 includes a liquid storage tank 16, a liquid outlet 14, and a liquid inlet 17. The liquid outlet 14 is connected to the inlet end of the flow meter 2, and the liquid inlet 17 is connected to the reflux auxiliary pipe section 2 8. Specifically, the liquid outlet 14 is provided on the side wall of the liquid storage tank 16 near the bottom, and the liquid inlet 17 is provided on the side wall of the liquid storage tank 16 near the top.

[0049] According to some embodiments of the present application, a limit liquid line 15 is marked on the side wall of the liquid storage tank 16. The amount of solution below the limit solution line 15 should be no less than the amount of solution required for five minutes of corrosive wear. The material of the liquid storage tank 16 is preferably corrosion-resistant material. The shape of the liquid storage tank 16 is not limited to cylindrical, but can also be square. The effective volume of the liquid storage tank 16 should be greater than the amount of solution required for 15 minutes of corrosive wear. The calculation formula is: V = 7.1×10-4τD2, where V is the amount of solution required for 15 minutes, in m3; τ is the flow rate of the liquid in the main pipeline, in m / s; and D is the inner diameter of the main pipeline, in mm.

[0050] According to some embodiments of the present application, the liquid storage device 1 further includes a liquid shortage alarm component, which is configured to issue an alarm when the liquid level in the liquid storage tank 16 reaches the limit liquid line 15. This design enables an automatic alarm to be issued when the effective liquid storage amount in the liquid storage tank 16 is less than five minutes of operation, thereby ensuring the safety of the testing process.

[0051] According to some embodiments of the present application, the liquid shortage alarm assembly includes a suspension wire 9, a switch 10, an alarm 11, a power supply 12, and a float 13; wherein the float 13 is arranged in a symmetrical connecting pipe on one side of the liquid storage tank 16, the float 13 is connected to one end of the switch 10 via the suspension wire 9, the other end of the switch 10 is connected to the alarm 11, and the alarm 11 is connected to the power supply 12. The specific working principle of the liquid shortage alarm assembly is as follows: when the configured corrosive liquid is added to the liquid storage tank 16, the float 13 moves upward, the suspension wire 9 is in a relaxed state, the switch 10 jumps, and the alarm system circuit is in a disconnected state. Under normal conditions, the corrosive solution enters the electrochemical monitoring device 4 and the waste liquid treatment device 6 from the liquid outlet 14, and then flows back into the liquid storage tank 16 through the liquid inlet 17, and the suspension wire 9 is always in a relaxed state. When a piping system malfunctions, the corrosive liquid cannot flow back in time, causing the liquid level in tank 16 to drop and float 13 to move downward. When the liquid level in tank 16 falls below the position marked by limit liquid line 15, suspension line 9 tightens, switch 10 connects to the alarm circuit, and alarm 11 sounds. The liquid level at limit liquid line 15, when the suspension line is straightened and alarm 11 sounds, should be at least the amount of solution required for 5 minutes of corrosive wear.

[0052] According to some embodiments of the present application, the waste liquid treatment device 6 includes a treatment box 41, a reflux liquid inlet end 44, a reflux liquid outlet end 39, and a filter assembly. The reflux liquid inlet end 44 is connected to the reflux auxiliary pipe section 5, the reflux liquid outlet end 39 is connected to the inlet end of the reflux pump 7, and the filter assembly is used to intercept iron filings formed during the wear process. Specifically, the treatment box 41 is provided with an anti-splash baffle 40 on the side of the reflux liquid inlet, and the lower edge of the anti-splash baffle 40 leaves a certain gap from the bottom of the treatment box 41. The anti-splash baffle 40 and the three inner side walls of the treatment box 41 form the reflux liquid inlet end 44. After the reflux liquid enters the reflux liquid inlet end 44, it comes out from the gap area between the lower edge of the anti-splash baffle 40 and the bottom of the treatment box 41; the reflux liquid outlet end 39 is located on the side of the treatment box 41 away from the reflux liquid inlet end 44 and close to the bottom of the treatment box.

[0053] According to some embodiments of the present application, the filter assembly includes multiple layers of magnetic filters 42 located on the bottom wall of the treatment tank 41. The multiple layers of magnetic filters 42 have different heights and are spaced in ascending order according to the direction of reflux flow. Specifically, the reflux flow direction is from the reflux inlet 44 to the reflux outlet 39. Five layers of magnetic filters 42 of varying heights are located between 1 / 4 and 2 / 3 of the bottom plate of the treatment tank 41, with the lowest magnetic filter 42 higher than the bottom edge of the anti-splash baffle 40. This allows the liquid returning to the treatment tank 41 to be intercepted and filtered layer by layer by the five layers of magnetic filters 42 of varying heights. The multiphase flow passing through the elbow pipe 22 enters the reflux inlet 44. Fine iron filings generated during wear are adsorbed by the magnetic filters 42 under the filtering action of the anti-splash baffle 40 and the multiple layers of magnetic filters 42. After separation and adsorption, the corrosive solution is returned to the liquid storage tank 16 through the reflux outlet 39 via the reflux pump 7.

[0054] According to some embodiments of the present application, the waste liquid treatment device 6 further includes an overflow alarm component, which is used to issue an alarm when the liquid level of the treatment box 41 is at the anti-overflow line 43.

[0055] According to some embodiments of the present application, the overflow alarm assembly includes a second suspension wire 34, a second switch 35, a second alarm 36, a second power supply 37, and a second float 38. The second float 38 is disposed within a conduit at the same height on one side of the treatment box 41. The second float 38 is connected to one end of the second switch 35 via the second suspension wire 34. The other end of the second switch 35 is connected to the second alarm 36, which is in communication with the second power supply 37. The second suspension wire 34 and the second float 38 control the on / off state of the second switch 35, thereby achieving on / off control of the alarm circuit.

[0056] In the embodiment of the present application, by adjusting the docking angle of the pipe joint flange 19 and the elbow flange 21, the inclination angle of the elbow pipe 22 relative to the horizontal plane is changed, thereby generating a fluid with the required inclination angle in the elbow pipe 22, achieving the flow pattern and inclination angle requirements. Before the experiment, an auxiliary electrode 26 and a reference electrode 27 are placed in the auxiliary pipe 25, the research electrode 24 is inserted into the research electrode jack 23, and the research electrode 24, the auxiliary electrode 26 and the reference electrode 27 are respectively connected to the multi-channel electrochemical workstation 28. During the test, the configured corrosive liquid is added to the liquid storage tank 16, the power pump 3 and the reflux pump 7 are started, and the power of the power pump 3 and the reflux pump 7 are adjusted by the adjustable speed motor control. The full-area electrochemical real-time monitoring system for corrosion wear with a specified flow pattern and fixed flow rate starts working. When the corrosive liquid passes through the elbow pipe, the electrochemical workstation starts to test the wear and corrosion rate of the research electrode in real time.

[0057] Compared with the prior art, the embodiments of the present application have the following features:

[0058] 1) The stress distribution in the downhole inclination section is complex, and the liquid flow pattern is variable. Affected by the working environment, the fluid in the pipeline may have different degrees of inclination angles in addition to the conventional horizontal and vertical flow. The existing testing systems are difficult to accurately and instantly provide the corrosion status of various parts of the metal pipe under different flow patterns at complex inclination angles. The real-time electrochemical monitoring system for the entire area of ​​the metal pipe under different flow patterns in this application was developed specifically for such complex working conditions.

[0059] 2) Since the fixing holes on the pipe joint flange and the elbow flange in this application are in the shape of concentric arcs, the pipe joint flange and the elbow flange can be rotated circumferentially to adjust the angle during the docking process, thereby achieving different angles of inclination of the elbow pipe relative to the horizontal plane, thereby simulating fluid conditions at all angles.

[0060] 3) Weight loss testing can visually demonstrate the severity of corrosion and wear. Electrochemical testing is instantaneous but less stable. In this application, a detachable research electrode was used in the elbow test area. The research electrode was weighed before and after the experiment, and the electrochemical research results were verified using weight loss testing to ensure the accuracy and rigor of all test data.

[0061] 4) Wear corrosion is a synergistic effect of fluid mechanics and corrosive media. By testing the weight loss in corrosive and non-corrosive fluid environments and combining them with static immersion results, the corrosion wear synergistic mechanism analysis can be achieved in real time.

[0062] 5) The introduction of the liquid shortage / overflow alarm component in this application ensures the safety of the test process; the introduction of the waste liquid treatment device greatly reduces the amount of solution used in the test process and reduces the test cost.

[0063] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A real-time electrochemical monitoring system for the entire area of ​​a metal pipe under different flow regimes, characterized in that: It includes a liquid storage device, an electrochemical monitoring device and a waste liquid treatment device. The liquid storage device is connected to a power pump through a flow meter. The electrochemical monitoring device includes an elbow pipe, an electrode assembly and a multi-channel electrochemical workstation. The electrode assembly is arranged on the elbow pipe. The multi-channel electrochemical workstation is connected to the electrode assembly. The power pump is connected to a reflux auxiliary pipe section 1 through the elbow pipe, and the inclination angle of the elbow pipe relative to the horizontal plane is adjustable. The reflux auxiliary pipe section 1 is connected to the inlet end of the waste liquid treatment device, and the outlet end of the waste liquid treatment device is connected to the reflux auxiliary pipe section 2 through a reflux pump. The reflux auxiliary pipe section 2 is connected to the reflux port of the liquid storage device.

2. The real-time electrochemical monitoring system for the entire area of ​​a metal pipe under different flow states according to claim 1 is characterized in that: The electrode assembly includes a research electrode, an auxiliary electrode and a reference electrode. There are multiple research electrodes, and the multiple research electrodes are evenly distributed along the axial direction and circumferential direction of the elbow pipe.

3. The real-time electrochemical monitoring system for the entire metal pipe area under different flow regimes according to claim 1 is characterized in that: A flange connection structure is provided between the outlet end of the power pump and the connection end of the elbow pipe, and the flange connection structure enables the inclination angle of the elbow pipe relative to the horizontal plane to be adjustable.

4. The real-time electrochemical monitoring system for the entire metal pipe area under different flow regimes according to claim 3 is characterized in that: The flange connection structure includes a pipe joint connected to the power pump and an elbow flange provided at the end of the elbow pipe. The end of the pipe joint is provided with a pipe joint flange, and the pipe joint flange and the elbow flange are both provided with multiple fixing holes correspondingly along the circumferential direction.

5. The real-time electrochemical monitoring system for the entire area of ​​a metal pipe under different flow regimes according to any one of claims 1 to 4, characterized in that: The liquid storage device includes a liquid storage box, a liquid outlet and a liquid inlet. The liquid outlet is connected to the inlet end of the flow meter, and the liquid inlet is connected to the second reflux auxiliary pipe section.

6. The real-time electrochemical monitoring system for the entire area of ​​a metal pipe under different flow regimes according to claim 5 is characterized in that: A limit liquid line is marked on the side wall of the liquid storage tank, and the amount of solution below the limit liquid line should be no less than the amount of solution required for five minutes of corrosion wear.

7. The real-time electrochemical monitoring system for the entire metal pipe area under different flow regimes according to claim 6 is characterized in that: The liquid storage device further comprises a liquid shortage alarm component, which is used to issue an alarm when the liquid level of the liquid storage tank is at the limit liquid line.

8. The real-time electrochemical monitoring system for the entire area of ​​a metal pipe under different flow regimes according to any one of claims 1 to 4, characterized in that: The waste liquid treatment device includes a treatment box, a reflux liquid inlet, a reflux liquid outlet and a filter assembly. The reflux liquid inlet is connected to the reflux auxiliary pipe section, the reflux liquid outlet is connected to the inlet of the reflux pump, and the filter assembly is used to intercept iron chips formed during the wear process.

9. The real-time electrochemical monitoring system for the entire metal pipe area under different flow regimes according to claim 8 is characterized in that: The filter assembly includes multiple layers of magnetic filter screens arranged on the bottom wall of the processing box. The multiple layers of magnetic filter screens have different heights and are arranged in sequence from low to high according to the flow direction of the reflux liquid.

10. The real-time electrochemical monitoring system for the entire area of ​​a metal pipe under different flow regimes according to claim 8, characterized in that: The waste liquid treatment device further comprises an overflow alarm component, which is used to issue an alarm when the liquid level of the treatment box is at an anti-overflow line.

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