Stray current interference corrosion simulation loading system

Abstract

A stray current interference corrosion simulation loading system relates to the technical field of oil and gas pipeline corrosion protection, and can simulate and load different stray current interferences caused by various interference sources and reproduce a stray current interference corrosion environment to the greatest extent, thereby providing reliable support for high precision and high efficiency of a stray current interference corrosion experiment. The stray current interference corrosion simulation loading system comprises a main control assembly, and a subway stray current interference simulation assembly, a high-voltage transmission line / direct-current grounding electrode discharge simulation assembly and an alternating-current transmission line simulation assembly which are respectively connected with the main control assembly, the metro stray current interference simulation assembly can be used for simulating metro stray current signals, the high-voltage transmission line / direct-current grounding electrode discharge simulation assembly can be used for simulating high-voltage transmission line / direct-current grounding electrode discharge stray current signals, and the alternating-current transmission line simulation assembly can be used for simulating alternating-current transmission line stray current signals.

Description

Technical Field

[0001] The utility model relates to the technical field of corrosion protection of oil and gas pipelines, in particular to a simulation loading system for stray current interference corrosion. Background Technique

[0002] At present, with the large-scale construction of infrastructure projects such as high-speed railways and urban subways and AC / DC high-voltage transmission lines in China, the areas where the above-mentioned infrastructure intersects or converges with oil and gas pipelines are expanding rapidly, resulting in an increasingly prominent problem of pipeline corrosion caused by stray currents, which seriously threatens the safe operation of pipelines. Among them, stray current refers to the current flowing outside the designed or specified circuit, and the corrosion caused by stray current to materials is called stray current corrosion.

[0003] Specifically, urban rail transit systems, such as subways or light rails, generally use DC traction and return through running rails. Since the track is not completely insulated from the ground, it is inevitable that current will leak from the running rail into the ground to form stray current, which will interfere with metal components such as buried oil and gas pipelines in the vicinity. That is, the DC current leaked from the railway line will cause DC stray current corrosion to the pipeline.

[0004] At the same time, with the rise of the high-voltage power grid as the backbone grid of the energy Internet, the construction of UHV AC / DC projects in China has achieved rapid development. UHV AC / DC transmission and transformation projects play a crucial role in China's power transmission due to their advantages such as large capacity, high efficiency, and long distance. However, due to the very similar requirements for site selection between AC / DC power transmission projects and oil and gas pipeline projects, it is very likely that the two will cross or overlap in the transmission path, resulting in the inevitable influence of the DC grounding electrode in-ground current and AC / DC transmission line stray current on buried metal pipelines. In other words, the AC high-voltage line drainage and the induced AC current will cause AC stray current corrosion to the pipeline. In the concentrated area of railways, AC high-voltage lines, and oil and gas transmission pipelines, under the combined interference of DC stray current and AC stray current, a complex stray current corrosion environment will be formed, resulting in AC / DC mixed stray current corrosion of buried metal pipelines.

[0005] In the prior art, regarding the problem of stray current interference, a large number of theoretical studies and tests have been carried out in the industry. The theoretical research focuses on the corrosion mechanism and law of stray current, and experts have basically reached a consensus. Due to the interference characteristics of different interference sources, the stray current interference of buried oil and gas pipelines is relatively complex, including DC interference, AC interference, and AC-DC mixed interference. At present, the research on the corrosion behavior of oil and gas pipelines under stray current interference generally adopts two methods: on-site testing and indoor simulation. On-site testing can only be carried out in a single interference environment, and the results are highly targeted; while indoor simulation testing often focuses on the corrosion reaction in the area where stray current flows in and out of the pipeline. This is an idealized corrosion environment, and the experimental results have limited reference value for working condition experiments. In addition, the prediction of stray current corrosion before the construction of new pipelines and the evaluation of the effect after the installation of drainage facilities, which are stray current interference protection measures, are also important links in pipeline operation management. At present, there is no very effective equipment or device to solve such problems, and the inventors of this application believe that its detection methods and means need to be improved. Summary of the Invention

[0006] The purpose of the present invention is to provide a stray current interference corrosion simulation loading system, which can simulate and load different stray current interferences caused by various interference sources, and reproduce the stray current interference corrosion environment to the greatest extent, so as to provide reliable support for the high-precision and high-efficiency of stray current interference corrosion experiments.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A stray current interference corrosion simulation loading system includes: a main control component, the main control component includes: a control module, a display module and a communication module connected to the control module, and the display module is used to control the operation of the entire system and parameter adjustment, and the communication module is used to connect to a remote monitoring terminal; the control module is connected to an external AC power supply;

[0009] A subway stray current interference simulation component, the subway stray current interference simulation component is connected to the control module of the main control component; the subway stray current interference simulation component includes: a power supply module, and the input end of the power supply module is connected to the external AC power supply; the output end of the power supply module is respectively connected to a first MCU control module, a first DC interference voltage generation module and a first output drive module, and the output end of the first MCU control module is connected to the input end of the first DC interference voltage generation module; the output end of the first DC interference voltage generation module is connected to the input end of the first output drive module, and the output end of the first output drive module contains DC and AC signals for simulating subway stray current signals;

[0010] High-voltage transmission line / DC grounding electrode discharge simulation component, the high-voltage transmission line / DC grounding electrode discharge simulation component is connected to the control module of the main control component; the high-voltage transmission line / DC grounding electrode discharge simulation component includes: a DC power supply module, and the input end of the DC power supply module is connected to the external AC power supply; the output end of the DC power supply module is respectively connected to a second MCU control module, a second DC interference voltage generation module and a second output driving module, and the output end of the second MCU control module is connected to the input end of the second DC interference voltage generation module; the output end of the second DC interference voltage generation module is connected to the input end of the second output driving module, and the output end of the second output driving module outputs a DC signal for simulating the stray current signal of the high-voltage transmission line / DC grounding electrode discharge;

[0011] AC transmission line simulation component, the AC transmission line simulation component is connected to the control module of the main control component; the AC transmission line simulation component includes: an AC power supply module, and the input end of the AC power supply module is connected to the external AC power supply; the output end of the AC power supply module is respectively connected to a third MCU control module, an AC interference voltage generation module and a third output driving module, and the output end of the third MCU control module is connected to the input end of the AC interference voltage generation module; the output end of the AC interference voltage generation module is connected to the input end of the third output driving module, and the output end of the third output driving module outputs an AC signal for simulating the stray current signal of the AC transmission line.

[0012] Among them, the power supply module, the first MCU control module, the first DC interference voltage generation module, and the first output driving module of the subway stray current interference simulation component are integrated on the first PCB board;

[0013] The DC power supply module, the second MCU control module, the second DC interference voltage generation module, and the second output driving module of the high-voltage transmission line / DC grounding electrode discharge simulation component are integrated on the second PCB board;

[0014] The AC power supply module, the third MCU control module, the AC interference voltage generation module, and the third output driving module of the AC transmission line simulation component are integrated on the third PCB board.

[0015] In actual application, the stray current interference corrosion simulation loading system further includes: a cabinet, and a plurality of partition boards are arranged in the cabinet from top to bottom; the main control component, the subway stray current interference simulation component, the high-voltage transmission line / DC grounding electrode discharge simulation component, and the AC transmission line simulation component are respectively arranged at different partition boards.

[0016] Among them, the display module uses an LCD liquid crystal screen, and the liquid crystal screen is installed on the inner surface of the cabinet door under the cabinet door of the cabinet.

[0017] Specifically, the first PCB board, the second PCB board, and the third PCB board are respectively plugged and fixed to the corresponding partition boards.

[0018] Furthermore, cable holes are provided at the bottom of the cabinet and at corresponding positions of each partition board for cables to access the cabinet.

[0019] Even further, the cabinet is a cabinet with a carbon steel material sprayed on its surface.

[0020] Compared with the prior art, the stray current interference corrosion simulation loading system of the present invention has the following advantages:

[0021] In the stray current interference corrosion simulation loading system provided by the present invention, according to the signal characteristics of different interference sources, interference signal independent components are set, and then a variety of interference modes are integrated into one by the main control component, meeting the vast majority of scene requirements for current stray current interference experiments and drainage effect evaluation on the pipeline site, thereby effectively reducing the experimental cost and improving the experimental efficiency; in addition, this loading system can be coordinated and debugged with pipeline operation management and detection systems such as intelligent cathodic protection equipment and in-pipe current monitoring systems, thereby further effectively improving the intelligent level of buried oil and gas pipeline detection; and its structure is simple and reasonable, and it is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the frame structure of the stray current interference corrosion simulation loading system provided by an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the cabinet in the stray current interference corrosion simulation loading system provided by an embodiment of the present invention.

[0024] Reference Numerals:

[0025] 1 - Subway stray current interference simulation component; 2 - High-voltage transmission line / DC grounding electrode discharge simulation component; 3 - AC transmission line simulation component; 4 - Main control component; 41 - LCD liquid crystal screen; 5 - Cabinet; 51 - Cabinet door; 6 - Cable; 7 - Partition board. Detailed implementation manners

[0026] For the convenience of understanding, the stray current interference corrosion simulation loading system provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0027] The embodiments of the present invention provide a stray current interference corrosion simulation loading system, as Figure 1 and Figure 2 shown, including: a main control component 4, the main control component 4 includes: a control module, and a display module and a communication module connected to the control module, and the display module is used to control the operation of the entire system and parameter adjustment, and the communication module is used to connect to a remote monitoring terminal, so as to achieve the purpose of remote monitoring; the control module is connected to an external AC power supply;

[0028] A subway stray current interference simulation component 1, the subway stray current interference simulation component 1 is connected to the control module of the main control component 4; the subway stray current interference simulation component 1 includes: a power supply module, and the input end of the power supply module is connected to the external AC power supply; the output end of the power supply module is respectively connected to a first MCU control module, a first DC interference voltage generation module and a first output driving module, and the output end of the first MCU control module is connected to the input end of the first DC interference voltage generation module; the output end of the first DC interference voltage generation module is connected to the input end of the first output driving module, and the output end of the first output driving module contains DC and AC electrical signals, so as to be used to simulate subway stray current signals, so that according to the experimental needs, the change of the pipeline potential caused by the stray current interference generated during subway operation can be fed into the pipeline.

[0029] A high-voltage transmission line / direct current grounding electrode discharge simulation component 2, the high-voltage transmission line / direct current grounding electrode discharge simulation component 2 is connected to the control module of the main control component 4; the high-voltage transmission line / direct current grounding electrode discharge simulation component 2 includes: a DC feeding power supply module, and the input end of the DC feeding power supply module is connected to the external AC power supply; the output end of the DC feeding power supply module is respectively connected to a second MCU control module, a second DC interference voltage generation module and a second output driving module, and the output end of the second MCU control module is connected to the input end of the second DC interference voltage generation module; the output end of the second DC interference voltage generation module is connected to the input end of the second output driving module, and the output end of the second output driving module outputs a DC electrical signal, so as to be used to simulate high-voltage transmission line / direct current grounding electrode discharge stray current signals, so that according to the experimental needs, the current affecting the pipeline potential after conversion caused by high-voltage transmission line / grounding electrode discharge can be fed into the pipeline, and then the passive change situation of the pipeline potential during high-voltage transmission line / grounding electrode discharge can be simulated;

[0030] The AC transmission line simulation component 3 is connected to the control module of the main control component 4; the AC transmission line simulation component 3 includes: an AC power supply module, and the input end of the AC power supply module is connected to an external AC power supply; the output end of the AC power supply module is respectively connected to a third MCU control module, an AC interference voltage generation module, and a third output driving module, and the output end of the third MCU control module is connected to the input end of the AC interference voltage generation module; the output end of the AC interference voltage generation module is connected to the input end of the third output driving module, and the output end of the third output driving module outputs an AC signal for simulating the stray current signal of the AC transmission line, so that according to the experimental needs, the converted AC transmission line interference influence current can be fed into the pipeline, and then the passive change of the AC potential of the pipeline during the AC transmission line interference can be simulated.

[0031] Compared with the prior art, the stray current interference corrosion simulation loading system described in the embodiment of the present invention has the following advantages:

[0032] In the stray current interference corrosion simulation loading system provided by the embodiment of the present invention, according to the characteristics of different interference source signals, interference signal independent components are set, and then a variety of interference modes are integrated into one by the main control component, meeting the vast majority of scenario requirements of the current stray current interference experiment on the pipeline site and the evaluation of the drainage effect, thus effectively reducing the experimental cost and improving the experimental efficiency; in addition, this loading system can be coordinated and debugged with pipeline operation management and detection systems such as intelligent cathodic protection equipment and in-pipe current monitoring systems, thereby further effectively improving the intelligent level of buried oil and gas pipeline detection; and its structure is simple and reasonable, and it is easy to install and disassemble.

[0033] Among them, as Figure 1 and Figure 2 shown, the power supply module, the first MCU control module, the first DC interference voltage generation module, and the first output driving module of the above subway stray current interference simulation component 1 can be preferably integrated on the first PCB board;

[0034] The DC power supply module, the second MCU control module, the second DC interference voltage generation module, and the second output driving module of the above high-voltage transmission line / DC grounding electrode discharge simulation component 2 can be preferably integrated on the second PCB board;

[0035] The AC power supply module, the third MCU control module, the AC interference voltage generation module, and the third output driving module of the above AC transmission line simulation component 3 can be preferably integrated on the third PCB board.

[0036] In actual application, as Figure 1 and Figure 2As shown in the figure, the stray current interference corrosion simulation loading system provided by the embodiment of the present utility model may further include: a cabinet 5, and a plurality of partition boards 7 may be arranged in the cabinet 4 from top to bottom; the above-mentioned main control component 4, subway stray current interference simulation component 1, high-voltage transmission line / direct current grounding electrode discharge simulation component 2, and alternating current transmission line simulation component 3 may be respectively arranged at different partition boards 7.

[0037] Among them, as Figure 1 and Figure 2 shown, the above-mentioned display module may adopt an LCD liquid crystal screen 41, and the liquid crystal screen may be installed inside the cabinet surface below the cabinet door 51 of the cabinet 5; the liquid crystal screen can be used to control the operation of the entire system and parameter adjustment, for example: interference type, interference mode, interference time, period, frequency, interference voltage / current density magnitude, etc.

[0038] Specifically, as Figure 1 and Figure 2 shown, the above-mentioned first PCB board, second PCB board, and third PCB board may be respectively plugged and fixed to the corresponding partition board 7, so that the three simulation components are all placed on the partition board 7 inside the cabinet 5, and are of a hot-swap structure with the cabinet 5, and thus can be replaced without disconnecting and reconnecting wires.

[0039] Furthermore, as Figure 1 and Figure 2 shown, cable holes may be provided at the bottom of the above-mentioned cabinet 5 and corresponding positions of each partition board 7 for cables 6 to access the cabinet 5, so that the output end of the cable 6 can be connected to a pipeline, a test piece, a drainage facility, or other conductors according to the experimental purpose.

[0040] Even further, as Figure 1 and Figure 2 shown, the above-mentioned cabinet is a cabinet with a carbon steel material sprayed on its surface.

[0041] When the stray current interference corrosion simulation loading system provided by the embodiment of the present utility model is used, an external power supply needs to be configured, an alternating current power supply is adopted, and 220V civil electricity can be directly used for indoor use; at the same time, according to the experimental purpose, the used interference components are installed at the corresponding positions in the cabinet, the external power supply is connected, the interference mode, type, parameters, etc. are set, and the cable output end is connected to a pipeline, a test piece, a drainage facility, or other conductors, etc., and then the experiment can be carried out.

[0042] The stray current interference corrosion simulation loading system provided by the embodiment of the present utility model can realize the corrosion simulation of the following multiple stray current interference modes: (1) subway stray current interference, (2) stray current interference of ultra-high voltage / high voltage DC transmission lines, (3) stray current interference caused by the discharge of ultra-high voltage / high voltage DC grounding electrodes, (4) stray current interference of AC transmission lines, as well as the combined interference caused by the combination of the above interference modes, that is, this loading system can simultaneously provide the corrosion simulation of multiple types of stray current interference;

[0043] Moreover, the types, modes, intensities and periods of the stray current interference of this loading system can all be adjusted, so as to effectively meet the multiple requirements of the stray current interference experimental system and solve the core problems of the stray current interference experimental system; In addition, this loading system can be used for the simulation test of stray current interference in the laboratory, the on-site corrosion assessment test before the construction of a new pipeline, the adaptability test of the stray current drainer and the drainage ground bed of the in-service pipeline, and the accelerated simulation test of stray current corrosion, etc.

[0044] As mentioned above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A stray current interference corrosion simulation loading system, characterized in that: include: A main control component, the main control component includes: a control module, and a display module and a communication module connected to the control module, wherein the display module is used to control the operation of the entire system and parameter adjustment, and the communication module is used to connect to a remote monitoring terminal; the control module is connected to an external AC power supply; A subway stray current interference simulation component, wherein the subway stray current interference simulation component is connected to the control module of the main control component; the subway stray current interference simulation component comprises: a power supply module, and the input end of the power supply module is connected to the external AC power supply; the output end of the power supply module is respectively connected to a first MCU control module, a first DC interference voltage generation module and a first output driver module, and the output end of the first MCU control module is connected to the input end of the first DC interference voltage generation module; the output end of the first DC interference voltage generation module is connected to the input end of the first output driver module, and the output end of the first output driver module contains DC and AC signals for simulating subway stray current signals; A high-voltage transmission line / DC grounding electrode discharge simulation component, wherein the high-voltage transmission line / DC grounding electrode discharge simulation component is connected to the control module of the main control component; the high-voltage transmission line / DC grounding electrode discharge simulation component comprises: a DC feed power supply module, and the input end of the DC feed power supply module is connected to the external AC power supply; the output end of the DC feed power supply module is respectively connected to a second MCU control module, a second DC interference voltage generation module and a second output drive module, and the output end of the second MCU control module is connected to the input end of the second DC interference voltage generation module; the output end of the second DC interference voltage generation module is connected to the input end of the second output drive module, and the output end of the second output drive module outputs a DC signal for simulating a high-voltage transmission line / DC grounding electrode discharge stray current signal; An AC power transmission line simulation component, wherein the AC power transmission line simulation component is connected to the control module of the main control component; the AC power transmission line simulation component comprises: an AC feed power supply module, and the input end of the AC feed power supply module is connected to the external AC power supply; the output end of the AC feed power supply module is respectively connected to a third MCU control module, an AC interference voltage generating module and a third output driving module, and the output end of the third MCU control module is connected to the input end of the AC interference voltage generating module; the output end of the AC interference voltage generating module is connected to the input end of the third output driving module, and the output end of the third output driving module outputs an AC signal for simulating an AC transmission line stray current signal.

2. The stray current interference corrosion simulation loading system according to claim 1 is characterized in that: The power supply module, the first MCU control module, the first DC interference voltage generation module, and the first output drive module of the subway stray current interference simulation component are integrated on a first PCB board; The DC feed power supply module, the second MCU control module, the second DC interference voltage generation module, and the second output drive module of the high-voltage transmission line / DC grounding electrode discharge simulation component are integrated on a second PCB board; The AC power feeding power supply module, the third MCU control module, the AC interference voltage generating module and the third output driving module of the AC power transmission line simulation component are integrated on a third PCB board.

3. The stray current interference corrosion simulation loading system according to claim 2 is characterized in that: Also includes: A cabinet, wherein a plurality of partitions are arranged inside the cabinet from top to bottom; The main control component, the subway stray current interference simulation component, the high-voltage transmission line / DC grounding electrode discharge simulation component, and the AC transmission line simulation component are respectively arranged at different partitions.

4. The stray current interference corrosion simulation loading system according to claim 3 is characterized in that: The display module adopts an LCD screen, and the LCD screen is installed in the cabinet surface below the cabinet door of the cabinet.

5. The stray current interference corrosion simulation loading system according to claim 3 is characterized in that: The first PCB board, the second PCB board and the third PCB board are respectively plugged and fixed to the corresponding partition boards.

6. The stray current interference corrosion simulation loading system according to claim 3 is characterized in that: The bottom of the cabinet and the corresponding positions of each of the partitions are provided with cable holes for allowing cables to be connected to the cabinet.

7. The stray current interference corrosion simulation loading system according to claim 3 is characterized in that: The cabinet is a cabinet whose surface is sprayed with carbon steel material.

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