Natural gas pipeline network cathode protection system

Abstract

The utility model discloses a cathode protection system for a natural gas pipeline network, which comprises a potential monitoring module, a direct current monitoring module, an alternating current monitoring module and an environmental parameter monitoring module, and the potential monitoring module, the direct current monitoring module, the alternating current monitoring module and the environmental parameter monitoring module are arranged at intervals along a natural gas buried pipeline. The potential monitoring module, the direct current monitoring module, the alternating current monitoring module and the environmental parameter monitoring module are used for acquiring potential, direct current, alternating current and environmental parameters of the natural gas buried pipeline, and the wireless data transmission module is used for transmitting the monitored parameters to the monitoring server; the scheduling personnel can comprehensively evaluate the data, adjust the preset potential value of the potentiostat in a targeted manner, and achieve the purpose of better controlling the overall potential of the natural gas buried pipeline to be within an ideal range through multiple monitoring-adjustment cycles, thereby improving the safe operation and protection effects of the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of natural gas pipeline protection technology, specifically a cathodic protection system for natural gas pipelines. Background Technology

[0002] Natural gas pipelines, buried in the soil for extended periods, are highly susceptible to the formation of galvanic cells, leading to electrochemical corrosion. Cathodic protection systems, as a key aspect of pipeline corrosion prevention, are an effective anti-corrosion measure.

[0003] In related technologies, cathodic protection systems use a potentiostat to dynamically adjust the output current, reducing the potential of buried natural gas pipelines below a safe threshold and blocking corrosive chemical reactions. However, buried natural gas pipelines are long, and the potential along these pipelines is neither equal nor uniform. Dynamically adjusting the output current based on the potential value at a specific point on the pipeline is insufficient to comprehensively and accurately reflect the actual potential requirements of the entire pipeline, thus affecting the protective effect. Furthermore, interference from stray currents within the pipeline can significantly reduce the protective effectiveness of the cathodic protection system during implementation. Therefore, researching ways to improve the effectiveness of cathodic protection and conducting corresponding practical work is extremely important for pipeline corrosion prevention. Utility Model Content

[0004] The purpose of this invention is to improve and innovate upon the shortcomings and problems existing in the background technology, and to provide a cathodic protection system for natural gas pipelines.

[0005] A cathodic protection system for a natural gas pipeline includes a potentiostat. One end of the feedback line of the potentiostat is connected to a buried natural gas pipeline, and the other end is connected to a reference electrode. The positive terminal of the potentiostat is connected to an auxiliary anode via an output line, and the negative terminal is connected to the buried natural gas pipeline via an output line. The system also includes a potential monitoring module, a DC current monitoring module, an AC current monitoring module, and an environmental parameter monitoring module. These modules are spaced along the buried natural gas pipeline. The potential monitoring module is used to acquire the potential of the buried natural gas pipeline at each location. The DC current monitoring module is used to acquire the DC current of the buried natural gas pipeline at each location. The AC current monitoring module is used to acquire the AC current of the buried natural gas pipeline at each location. The environmental parameter monitoring module is used to acquire the temperature and humidity of the environment.

[0006] The potential monitoring module, DC current monitoring module, AC current monitoring module, and environmental parameter monitoring module are all connected to the data acquisition board. The data acquisition board is connected to the PLC system. The PLC system communicates with the monitoring server through a wireless data transmission module. The monitoring server is connected to a display screen.

[0007] A further embodiment is that the potential monitoring module includes a voltage divider circuit and a first analog-to-digital converter; one end of the voltage divider circuit is connected to the buried natural gas pipeline, and the other end of the voltage divider circuit is connected to a reference electrode; the voltage signal sampling point of the voltage divider circuit is connected to the input terminal of the first analog-to-digital converter, and the output terminal of the first analog-to-digital converter is connected to the data acquisition board.

[0008] A further embodiment is that the DC current monitoring module includes a shunt and a second analog-to-digital converter. One end of the shunt is connected to the buried natural gas pipeline, and the other end of the shunt is connected to a reference electrode. The voltage signal sampling point of the shunt is connected to the input terminal of the second analog-to-digital converter, and the output terminal of the second analog-to-digital converter is connected to the data acquisition board.

[0009] A further embodiment is that the AC current monitoring module uses a flexible Rogowski coil, which is wound around the outside of the buried natural gas pipeline. The output of the flexible Rogowski coil is connected to the input of the integrator, and the output of the integrator is connected to the data acquisition board.

[0010] A further option is that the environmental parameter monitoring module is a resistance probe sensor, with one end of the resistance probe sensor connected to the buried natural gas pipeline and the other end connected to the data acquisition board; the resistance probe sensor can be a thermistor or a humidity sensor.

[0011] A further option is that the wireless data transmission module can be a 4G / 5G wireless network module.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model provides a cathodic protection system for natural gas pipelines. It acquires the potential, DC current, AC current, and environmental parameters of buried natural gas pipelines through a potential monitoring module, a DC current monitoring module, an AC current monitoring module, and an environmental parameter monitoring module. The monitored potential, DC current, AC current, and environmental parameters are then transmitted to a monitoring server via a wireless data transmission module and displayed on a screen. Dispatchers can comprehensively evaluate this data and perform remote operations. For example, dispatchers can remotely modify the preset potential of the potentiostat via a PLC system. In this way, the potentiostat dynamically adjusts its output current until the potential monitored through the feedback line is close to the preset potential. At this point, the entire buried natural gas pipeline will be controlled within an ideal range, improving the safe operation and protection effect of the pipeline. Attached Figure Description

[0013] Figure 1 A schematic diagram of the installation structure of the potential monitoring module, DC current module, AC current module and environmental parameter monitoring module provided in the embodiments of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of a cathodic protection system for a natural gas pipeline provided in an embodiment of the present invention.

[0015] Reference numerals in the attached diagram: 1. Potentiostat; 101. Auxiliary anode; 2. Potential monitoring module; 201. Voltage divider circuit; 202. First analog-to-digital converter; 3. DC current monitoring module; 301. Shunt; 302. Second analog-to-digital converter; 4. AC current monitoring module; 401. Flexible Rogowski coil; 402. Integrator; 5. Environmental parameter monitoring module; 501. Resistance probe sensor; 6. Reference electrode; 7. Data acquisition board; 8. PLC system; 9. Wireless data transmission module; 10. Monitoring server; 11. Display screen. Detailed Implementation

[0016] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] Please see Figures 1-2 This invention provides a cathodic protection system for a natural gas pipeline network, including a potentiostat 1. The potentiostat 1 includes an output line and a feedback line. The positive terminal of the potentiostat 1 is connected to an auxiliary anode 101, also known as an anode bed, via the output line. The negative terminal of the potentiostat 1 is connected to the buried natural gas pipeline via the output line. The potentiostat 1 outputs current through the output line, causing the potential of the buried natural gas pipeline to decrease, making the buried natural gas pipeline a cathode, thereby inhibiting the electrochemical corrosion process. One end of the feedback line of the potentiostat 1 is connected to the buried natural gas pipeline, and the other end is connected to a reference electrode 6. The main function of the reference electrode 6 is to provide a stable potential reference. Since the potential of the reference electrode 6 is very stable, the potential of the buried natural gas pipeline at the monitoring point can be obtained by measuring the potential difference between the potential of the buried natural gas pipeline and the reference electrode 6.

[0019] It should be noted that the constant potential meter 1 obtains the potential of the buried natural gas pipeline through the feedback line, but only obtains the potential value of a certain point in the buried natural gas pipeline. The potential value of a certain point is often difficult to represent the average potential value of the buried natural gas pipeline.

[0020] The potentiostat 1 compares the potential difference between the monitored reference electrode 6 and the buried natural gas pipeline with a preset potential. Using a PID control algorithm, it dynamically adjusts the output current to ensure that the potential value of the buried natural gas pipeline monitored through the feedback line is close to the preset potential. However, buried natural gas pipelines are long, and the potential along them is neither equal nor uniform. If the potentiostat 1 dynamically adjusts the output current based on the potential at a specific point on the pipeline, this adjustment will be insufficient to comprehensively and accurately reflect the actual potential requirements of the entire pipeline. This makes it difficult to control the pipeline potential within the ideal range, affecting the safe operation and protection effectiveness of the pipeline.

[0021] To monitor the potential, current, and environmental parameters of the buried natural gas pipeline, the system also includes a potential monitoring module 2, a DC current monitoring module 3, an AC current monitoring module 4, and an environmental parameter monitoring module 5. These modules are all spaced along the buried natural gas pipeline. The potential monitoring module 2 includes a voltage divider circuit 201 and a first analog-to-digital converter (ADC) 202. One end of the voltage divider circuit 201 is connected to the buried natural gas pipeline, and the other end is connected to a reference electrode 6. The voltage signal sampling point of the voltage divider circuit 201 is connected to the first ADC 202, attenuating the high voltage to a range that the ADC can process. The DC current monitoring module 3 includes a shunt 301 and a second analog-to-digital converter 302. One end of the shunt 301 is connected to the buried natural gas pipeline, and the other end is also connected to the reference electrode 6. The shunt 301 is actually a low-resistance precision resistor. The shunt 301 converts the current into a voltage, which is then processed by the second analog-to-digital converter 302. The outputs of both the first analog-to-digital converter 202 and the second analog-to-digital converter 302 are connected to the data acquisition board 7. The AC current monitoring module 4 uses a flexible Rogowski coil 401, which is wound around the buried natural gas pipeline. The output of the flexible Rogowski coil 401 is connected to the input of the integrator 402, and the output of the integrator 402 is also connected to the data acquisition board 7. The output signal of the flexible Rogowski coil 401 is proportional to the derivative of the measured current, and the integrator 402 can convert the derivative signal into a voltage value proportional to the AC current, thereby realizing the direct measurement of the AC current amplitude. The environmental parameter monitoring module 5 is a resistance probe sensor 501. One end of the resistance probe sensor 501 is connected to the buried natural gas pipeline, and the other end is connected to the data acquisition board 7. The resistance probe sensor 501 can be a thermistor or a humidity sensor. Since the resistance of a thermistor changes with temperature, and the resistance of a humidity sensor changes with humidity, the temperature and humidity data of the soil environment can be obtained based on the changes in resistance detected by the resistance probe sensor 501, thereby achieving the monitoring of environmental parameters.

[0022] The data acquisition board 7 is connected to the station's PLC system 8, which communicates with the monitoring server 10 via a wireless data transmission module 9. The monitoring server 10 is connected to a display screen 11. The wireless data transmission module 9 can be a 4G / 5G wireless network module. The wireless data transmission module 9 sends the monitored potential, DC current, AC current, and environmental parameters of the buried natural gas pipelines to the monitoring server 10, which displays the data on the display screen 11. The wireless data transmission module 9 can also remotely receive control commands for remote operation. Therefore, dispatchers can comprehensively evaluate the received monitoring data and perform remote operations based on the monitored data. Dispatchers can remotely modify the preset potential of the potentiostat 1 via the PLC system 8, so that the corresponding potentiostat 1 dynamically adjusts its output current according to the preset potential. Since the preset potential integrates the potentials of the various natural gas pipelines, the potentiostat 1 dynamically adjusts its output current until the potential monitored through the feedback line is close to the preset potential. At this point, the entire buried natural gas pipeline will be controlled within the ideal range.

[0023] It should be noted that dispatchers can also remotely notify on-site staff by phone, allowing on-site staff to modify the preset potential of potentiostat 1.

[0024] In a preferred embodiment, after obtaining the DC and AC currents of the buried natural gas pipeline, the dispatcher can also arrange for the staff of the natural gas station to add drainers to the natural gas pipeline sections with large stray currents. One end of the drainer is connected to the buried natural gas pipeline, and the other end of the drainer is grounded. The stray current on the buried natural gas pipeline flows into the ground through the drainer, thereby avoiding the stray current from flowing directly from the pipeline into the soil and causing electrochemical corrosion.

[0025] In summary, this utility model provides a cathodic protection system for natural gas pipelines. It acquires the potential, DC current, AC current, and environmental parameters of the buried natural gas pipeline through a potential monitoring module 2, a DC current monitoring module 3, an AC current monitoring module 4, and an environmental parameter monitoring module 5. The monitored data is then transmitted to a monitoring server 10 via a wireless data transmission module 9 and displayed on a screen 11. Dispatchers can comprehensively evaluate this data and perform remote operations. For example, dispatchers can remotely modify the preset potential of the potentiostat 1 via the PLC system 8. This dynamically adjusts the output current of the potentiostat 1 until the potential monitored through the feedback line approaches the preset potential. At this point, the entire buried natural gas pipeline is controlled within an ideal range, improving the pipeline's safe operation and protection.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0028] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Although embodiments of this utility model have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A cathodic protection system for a natural gas pipeline network, comprising a potentiostat (1), one end of the feedback line of the potentiostat (1) being connected to a buried natural gas pipeline, the other end of the feedback line of the potentiostat (1) being connected to a reference electrode (6), the positive electrode of the potentiostat (1) being connected to an auxiliary anode (101) via an output line, and the negative electrode of the potentiostat (1) being connected to the buried natural gas pipeline via an output line, characterized in that: It also includes a potential monitoring module (2), a DC current monitoring module (3), an AC current monitoring module (4), and an environmental parameter monitoring module (5). The potential monitoring module (2), DC current monitoring module (3), AC current monitoring module (4), and environmental parameter monitoring module (5) are all set at intervals along the buried natural gas pipeline. The potential monitoring module (2) is used to obtain the potential of the buried natural gas pipeline at each location. The DC current monitoring module (3) is used to obtain the DC current of the buried natural gas pipeline at each location. The AC current monitoring module (4) is used to obtain the AC current of the buried natural gas pipeline at each location. The environmental parameter monitoring module (5) is used to obtain the temperature and humidity of the environment. The potential monitoring module (2), DC current monitoring module (3), AC current monitoring module (4) and environmental parameter monitoring module (5) are all connected to the data acquisition board (7). The data acquisition board (7) is connected to the PLC system (8). The PLC system (8) communicates with the monitoring server (10) through the wireless data transmission module (9). The monitoring server (10) is connected to the display screen (11).

2. The cathodic protection system for a natural gas pipeline network according to claim 1, characterized in that: The potential monitoring module (2) includes a voltage divider circuit (201) and a first analog-to-digital converter (202); one end of the voltage divider circuit (201) is connected to the buried natural gas pipeline, and the other end of the voltage divider circuit (201) is connected to the reference electrode (6); the voltage signal sampling point of the voltage divider circuit (201) is connected to the input terminal of the first analog-to-digital converter (202), and the output terminal of the first analog-to-digital converter (202) is connected to the data acquisition board (7).

3. The cathodic protection system for a natural gas pipeline network according to claim 1, characterized in that: The DC current monitoring module (3) includes a shunt (301) and a second analog-to-digital converter (302). One end of the shunt (301) is connected to the buried natural gas pipeline, and the other end of the shunt (301) is connected to the reference electrode (6). The voltage signal sampling point of the shunt (301) is connected to the input terminal of the second analog-to-digital converter (302), and the output terminal of the second analog-to-digital converter (302) is connected to the data acquisition board (7).

4. A cathodic protection system for a natural gas pipeline network according to claim 1, characterized in that: The AC current monitoring module (4) uses a flexible Rogowski coil (401). The flexible Rogowski coil (401) is wound around the outside of the buried natural gas pipeline. The output of the flexible Rogowski coil (401) is connected to the input of the integrator (402). The output of the integrator (402) is connected to the data acquisition board (7).

5. A cathodic protection system for a natural gas pipeline network according to claim 1, characterized in that: The environmental parameter monitoring module (5) is a resistance probe sensor (501). One end of the resistance probe sensor (501) is connected to the buried natural gas pipeline, and the other end of the resistance probe sensor (501) is connected to the data acquisition board (7). The resistance probe sensor (501) can be a thermistor or a humidity sensor.

6. A cathodic protection system for a natural gas pipeline network according to claim 1, characterized in that: The wireless data transmission module (9) can be a 4G / 5G wireless network module.

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