Cathode protection and dynamic direct current stray current interference simulation device

Abstract

The utility model relates to the technical field of current corrosion and protection, in particular to a cathode protection and dynamic direct-current stray current interference simulation device, and aims to solve the technical problem that the comprehensive influence of cathode protection and dynamic stray current interference on the dynamic process of a buried pipeline cannot be simulated in the prior art. The cathode protection and dynamic direct current stray current interference simulation device comprises a current effect test system, an electrochemical platform and a data recording system, wherein the current effect test system comprises a cathode protection branch and a stray current interference branch which are connected in parallel. According to the cathode protection and dynamic direct-current stray current interference simulation device, the cathode protection branch and the stray current interference branch which are connected in parallel are used for simultaneously applying protection current and dynamic stray current to the test piece, so that the corrosion state and the cathode protection effect of a pipeline are intuitively reflected; the technical problem that an existing simulation device cannot simulate the comprehensive influence of cathode protection and dynamic stray current interference on the dynamic process of the buried pipeline is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of current corrosion and protection, in particular to a cathode protection and dynamic DC stray current interference simulation device. Background Art

[0002] Corrosion is one of the main causes of oil and gas pipeline accidents. Usually, anti-corrosion layer plus cathodic protection is used to protect pipelines. However, when urban subways are parallel or cross oil and gas pipelines, the current of their DC traction systems will leak through the rails during operation, forming stray currents and causing interference to nearby pipelines. The potential changes of the subway power rails cause the size and direction of the leaked current to change continuously, thus generating dynamic DC stray current interference.

[0003] The existing simulation devices fail to integrate the functions of the cathodic protection branch and the stray current interference branch, lack the necessary hardware support to simultaneously simulate the combined impact of these two systems on buried pipelines, and are unable to simulate the dynamic process of cathodic protection and dynamic stray current interference. Therefore, they are not competent for the study of the combination of cathodic protection and dynamic DC stray current interference.

[0004] The existing simulation devices have the technical problem of being unable to simulate the combined effects of cathodic protection and dynamic stray current interference on the dynamic process of buried pipelines. Utility Model Content

[0005] The utility model aims to provide a cathodic protection and dynamic DC stray current interference simulation device to solve the technical problem in the related art that the combined influence of cathodic protection and dynamic stray current interference on the dynamic process of buried pipelines cannot be simulated.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0007] The cathodic protection and dynamic DC stray current interference simulation device provided by the utility model comprises:

[0008] A current effect test system and an electrochemical platform, wherein the current effect test system, the test piece and the electrochemical platform are connected in series to form a loop. The current effect test system includes a cathode protection branch and a stray current interference branch connected in parallel. The cathode protection branch includes a constant current DC power supply for applying a protection current to the test piece. The stray current interference branch includes a waveform generator for applying a dynamic stray current to the test piece.

[0009] Specifically, it also includes a data recording system, and the data recording system includes a first switch, a second switch and a third switch. The constant current DC power supply is connected in parallel with the waveform generator; the first switch is connected in series with the constant current DC power supply, the second switch is connected in series with the waveform generator, and the third switch is connected in series with the main trunk of the current effect test system.

[0010] Specifically, the data recording system further includes a data recorder. When the data recorder is connected in series to the cathode protection branch, it is connected in parallel to the first switch; when the data recorder is connected in series to the stray current interference branch, it is connected in parallel to the second switch; when the data recorder is connected in series to the main trunk of the current effect test system, it is connected in parallel to the third switch.

[0011] Specifically, the electrochemical platform includes a box and an electrolyte, wherein the box is used to contain the electrolyte. The cathode protection branch also includes a first auxiliary electrode connected in series with the constant current DC power supply, and the first auxiliary electrode is arranged at one end of the cathode protection branch away from the test piece. The test piece and the first auxiliary electrode are both connected to the electrolyte.

[0012] Specifically, the stray current interference branch further includes a second auxiliary electrode connected in series with the waveform generator, the second auxiliary electrode is arranged at one end of the stray current interference branch away from the test piece, and the second auxiliary electrode is connected to the electrolyte.

[0013] Specifically, the data recording system further includes a reference electrode, one end of which is connected to the data recorder, and the other end of which is connected to the electrolyte, so as to provide a stable reference potential for the data recorder.

[0014] Specifically, the electrolyte is set to be a soil solution simulating the soil where the buried pipeline is located.

[0015] Specifically, the electrolyte is set to be natural soil, synthetic soil or a soil mixture.

[0016] Specifically, the first auxiliary electrode and the second auxiliary electrode are both configured to be made of a material having the same natural potential as that of the test piece.

[0017] Specifically, the first auxiliary electrode and the second auxiliary electrode are spaced apart to facilitate control and measurement of independent effects of the protection current and the dynamic stray current on the test piece.

[0018] Based on the above technical solutions, the beneficial effects of the present invention are analyzed as follows:

[0019] The utility model provides a cathodic protection and dynamic DC stray current interference simulation device, comprising:

[0020] A current effect test system and an electrochemical platform, wherein the current effect test system, the test piece and the electrochemical platform are connected in series to form a loop. The current effect test system includes a cathode protection branch and a stray current interference branch connected in parallel. The cathode protection branch includes a constant current DC power supply for applying a protection current to the test piece. The stray current interference branch includes a waveform generator for applying a dynamic stray current to the test piece.

[0021] In specific applications, the electrochemical platform is set up to meet the experimental environment requirements, the test piece is fixed on the electrochemical platform, a constant current DC power supply and a waveform generator are connected in parallel and then connected in series with the test piece and the electrochemical platform to form a loop, parameter calibration is performed, and the constant current DC power supply and the waveform generator are started to simulate cathodic protection and dynamic stray current interference, the reaction of the test piece is observed, and the parameters are adjusted in time. After the experiment, the equipment is turned off and cleaned and maintained.

[0022] It can be seen that compared with the existing technology, the cathodic protection and dynamic DC stray current interference simulation device simultaneously applies protection current and dynamic stray current to the test piece through the parallel cathodic protection branch and the stray current interference branch, which intuitively reflects the corrosion state of the pipeline and the cathodic protection effect, and overcomes the technical problem that the existing simulation device cannot simulate the comprehensive impact of cathodic protection and dynamic stray current interference on the dynamic process of buried pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A circuit connection diagram of a cathodic protection and dynamic DC stray current interference simulation device provided in an embodiment of the utility model.

[0025] icon:

[0026] 001, test piece;

[0027] 100. Current effect test system; 110. Cathodic protection branch; 111. Constant current DC power supply; 112. First auxiliary electrode; 120. Stray current interference branch; 121. Waveform generator; 122. Second auxiliary electrode;

[0028] 200, electrochemical platform; 210, housing; 220, electrolyte;

[0029] 300, data recording system; 310, first switch; 320, second switch; 330, third switch; 340, data recorder; 350, reference electrode. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] The existing simulation devices have the technical problem of being unable to simulate the combined effects of cathodic protection and dynamic stray current interference on the dynamic process of buried pipelines.

[0034] In view of this, the utility model provides a cathodic protection and dynamic DC stray current interference simulation device, comprising:

[0035] The current effect test system 100 and the electrochemical platform 200, the current effect test system 100, the test piece 001 and the electrochemical platform 200 are connected in series to form a loop. The current effect test system 100 includes a cathode protection branch and a stray current interference branch connected in parallel. The cathode protection branch 110 includes a constant current DC power supply 111, which is used to apply a protection current to the test piece 001. The stray current interference branch 120 includes a waveform generator 121, which is used to apply a dynamic stray current to the test piece 001.

[0036] Based on the above technical solutions, the cathodic protection and dynamic DC stray current interference simulation device provided by the utility model can achieve the following technical effects:

[0037] The cathodic protection and dynamic DC stray current interference simulation device applies protection current and dynamic stray current to the test piece 001 simultaneously through the parallel cathodic protection branch 110 and the stray current interference branch 120, which intuitively reflects the corrosion state of the pipeline and the cathodic protection effect, and overcomes the technical problem that the existing simulation device cannot simulate the comprehensive impact of cathodic protection and dynamic stray current interference on the dynamic process of the buried pipeline.

[0038] The following combination Figure 1 The structure and shape of the cathodic protection and dynamic DC stray current interference simulation device provided in this embodiment are described in detail:

[0039] In order to obtain more accurate current parameters in the simulation experiment to further verify the experimental conclusion, the scheme of this embodiment also includes a data recording system 300, which includes a first switch 310, a second switch 320, a third switch 330 and a data recorder 340. The first switch 310 is connected in series with the constant current DC power supply 111, the second switch 320 is connected in series with the waveform generator 121, and the third switch 330 is connected in series in the main road of the current effect test system 100 to control the on and off of the overall circuit. When the data recorder 340 is connected in series with the cathode protection branch 110, it is connected in parallel with the first switch 310 to measure the cathode protection current parameters; when the data recorder 340 is connected in series with the stray current interference branch 120, it is connected in parallel with the second switch 320 to measure the stray current interference parameters; when the data recorder 340 is connected in series with the main road of the current effect test system 100, it is connected in parallel with the third switch 330 to test the comprehensive current parameters at the test piece 001. When the data recorder 340 is connected, the corresponding switch is disconnected to allow current to pass through the data recorder 340 to achieve data measurement. When the data recorder 340 is removed, the switch is closed to directly provide a current path. The data recorder 340 uses a cathode potential recorder with automatic power on and off functions for recording current on and off points.

[0040] Regarding the composition of the electrochemical platform 200, specifically:

[0041] The electrochemical platform 200 includes a box 210 and an electrolyte 220, wherein the box 210 is used to contain the electrolyte 220. The electrolyte 220 may be a soil solution or natural soil, synthetic soil, or a soil mixture simulating the soil where the buried pipeline is located, so as to simulate the electrochemical characteristics of the actual soil.

[0042] In the scheme of this embodiment, the cathode protection branch 110 also includes a first auxiliary electrode 112 connected in series with the constant current DC power supply 111, and the first auxiliary electrode 112 is arranged at one end of the cathode protection branch 110 away from the test piece 001. The stray current interference branch 120 also includes a second auxiliary electrode 122 connected in series with the waveform generator 121, and the second auxiliary electrode 122 is arranged at one end of the stray current interference branch 120 away from the test piece 001. The test piece 001, the first auxiliary electrode 112 and the second auxiliary electrode 122 are all connected to the electrolyte 220, so that the cathode protection branch and the stray current interference branch of the current effect test system 100 can form a complete current loop. The data recording system 300 also includes a reference electrode 350, one end of the reference electrode 350 is connected to the data recorder 340, and the other end is connected to the electrolyte 220, which is used to provide a stable reference potential for the data recorder 340, so that the potential difference can be measured and recorded.

[0043] The first auxiliary electrode 112 and the second auxiliary electrode 122 are both set to be the same material with the natural potential as the test piece 001 to reduce the polarization effect caused by the difference in electrode materials, so that the current distribution is more uniform, and the corrosion and protection state of the pipeline material in the actual soil environment can be more truly reflected. The first auxiliary electrode 112 and the second auxiliary electrode 122 are set to be distributed at intervals, and the spacing is fixed. Through physical separation, the independent effects of the protection current and the dynamic stray current on the pipeline can be more accurately controlled and measured, avoiding mutual interference and maintaining the consistency of the experimental results.

[0044] In summary, the specific working process of the cathodic protection and dynamic DC stray current interference simulation device provided in this embodiment is as follows:

[0045] The soil solution in the box 210 is prepared to simulate the electrochemical properties of the actual soil, the test piece 001 is fixed on the electrochemical platform 200, and the constant current DC power supply 111 and the waveform generator 121 are connected in parallel to form a current loop with the test piece 001, the electrolyte, the first auxiliary electrode 112 and the second auxiliary electrode 122, and the first switch 310, the second switch 320 and the third switch 330 are connected in series to the two branches and the main line respectively. Parameter calibration is performed and the constant current DC power supply 111 and the waveform generator 121 are started, and the first switch 310, the second switch 320 and the third switch 330 are closed to simulate cathodic protection and dynamic stray current interference. Disconnect all switches, insert the reference electrode 350 into the electrolyte and connect it to the data recorder 340, connect the data recorder 340 in parallel with the first switch 310, close the second switch 320 and the third switch 330, and measure the cathode protection current parameters; disconnect all switches, connect the data recorder 340 in parallel with the second switch 320, close the first switch 310 and the third switch 330, and measure the stray current interference parameters; disconnect all switches, connect the data recorder 340 in parallel with the third switch 330, close the first switch 310 and the second switch 320, and measure the comprehensive current parameters at the test piece 001. Adjust the parameters in time, and shut down the equipment and perform cleaning and maintenance after the experiment.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A cathodic protection and dynamic DC stray current interference simulation device, characterized in that: include: Current effect testing system (100) and electrochemical platform (200); The current effect test system (100), the test piece (001) and the electrochemical platform (200) are connected in series to form a loop; The current effect testing system (100) comprises a cathode protection branch (110) and a stray current interference branch (120) connected in parallel; The cathode protection branch (110) comprises a constant current DC power supply (111) for applying a protection current to the test piece (001); The stray current interference branch (120) comprises a waveform generator (121) for applying a dynamic stray current to the test piece (001).

2. The cathodic protection and dynamic DC stray current interference simulation device according to claim 1, characterized in that: Also included is a data recording system (300); The data recording system (300) comprises a first switch (310), a second switch (320) and a third switch (330); The first switch (310) is installed in the cathode protection branch and is connected in series with the constant current DC power supply (111); The second switch (320) is installed in the stray current interference branch and is connected in series with the waveform generator (121); The third switch (330) is installed in the main circuit of the current effect testing system (100).

3. The cathodic protection and dynamic DC stray current interference simulation device according to claim 2, characterized in that: The data recording system (300) further includes a data recorder (340); When the data recorder (340) is connected in series to the cathode protection branch (110), it is connected in parallel to the first switch (310); When the data recorder (340) is connected in series to the stray current interference branch (120), it is connected in parallel to the second switch (320); When the data recorder (340) is connected in series to the main line of the current effect testing system (100), it is connected in parallel to the third switch (330).

4. The cathodic protection and dynamic DC stray current interference simulation device according to claim 3, characterized in that: The electrochemical platform (200) includes a housing (210) and an electrolyte (220); The box (210) is used to accommodate the electrolyte (220); The cathode protection branch (110) further comprises a first auxiliary electrode (112) connected in series with the constant current DC power supply (111); The first auxiliary electrode (112) is arranged at an end of the cathode protection branch (110) away from the test piece (001); The test piece (001) and the first auxiliary electrode (112) are both connected to the electrolyte (220).

5. The cathodic protection and dynamic DC stray current interference simulation device according to claim 4, characterized in that: The stray current interference branch (120) further includes a second auxiliary electrode (122) connected in series with the waveform generator (121); The second auxiliary electrode (122) is arranged at an end of the stray current interference branch (120) away from the test piece (001); The second auxiliary electrode (122) is connected to the electrolyte (220).

6. The cathodic protection and dynamic DC stray current interference simulation device according to claim 4, characterized in that: The data recording system (300) also includes a reference electrode (350); One end of the reference electrode (350) is connected to the data recorder (340), and the other end is connected to the electrolyte (220), so as to provide a stable reference potential for the data recorder (340).

7. The cathodic protection and dynamic DC stray current interference simulation device according to claim 4, characterized in that: The electrolyte (220) is provided as a soil solution.

8. The cathodic protection and dynamic DC stray current interference simulation device according to claim 4, characterized in that: The electrolyte (220) is provided as natural soil, synthetic soil or a soil mixture.

9. The cathodic protection and dynamic DC stray current interference simulation device according to claim 5, characterized in that: The first auxiliary electrode (112) and the second auxiliary electrode (122) are both made of a material having the same natural potential as that of the test piece (001).

10. The cathodic protection and dynamic DC stray current interference simulation device according to claim 5, characterized in that: The first auxiliary electrode (112) and the second auxiliary electrode (122) are spaced apart to facilitate control and measurement of the independent effects of the protection current and the dynamic stray current on the test piece (001).

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