Anti-corrosion protection design method and anti-corrosion protection system for buried metal pipeline

Abstract

The invention relates to the technical field of buried metal pipeline protection, and discloses an anti-corrosion protection design method and an anti-corrosion protection system for a buried metal pipeline. The method comprises the steps that an anti-corrosion protection system based on the photovoltaic module is constructed, the anti-corrosion protection system comprises the photovoltaic module, an auxiliary anode and a buried metal pipeline, the positive electrode of the photovoltaic module is connected with the auxiliary anode, and the negative electrode of the photovoltaic module is connected with the buried metal pipeline; and direct current output by the photovoltaic module flows into underground soil through the auxiliary anode and is conducted to the buried metal pipeline through the underground soil, so that cathode protection of the buried metal pipeline is realized. According to the principle that the photovoltaic module generates direct-current voltage under solar irradiation, the buried metal pipeline is connected to the negative electrode of the module, so that the buried metal pipeline presents negative potential, the anti-corrosion protection requirement is met, the technical problems that in the prior art, power sources along the pipeline are not easy to obtain, and a rectifying device is difficult to install and arrange are solved, system configuration is simplified, and system cost is reduced. And the operation and maintenance cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground metal pipeline protection, and in particular to an anti-corrosion protection design method and an anti-corrosion protection system for underground metal pipelines. Background Art

[0002] Conventional buried pipelines use cathodic protection using the impressed current method, which requires the configuration of an external power supply and rectifier according to the protection current and voltage.

[0003] The DC power supply provides direct current, usually using a constant potential instrument or a constant current instrument. The constant potential instrument can automatically adjust the output current to keep the potential of the protected metal structure at the set protection potential value. The constant current instrument outputs a constant current.

[0004] In addition, the installation and layout of cathodic protection rectifiers are difficult. The main reasons include the following aspects: environmental conditions, strict safety requirements, space and location restrictions, large weight and size, complex wiring and connection, interference and compatibility issues, and difficulty in maintenance and overhaul.

[0005] Based on the above analysis, it can be seen that for longer pipelines, it is not easy to obtain power along the pipeline, and the installation and layout of the rectifier device is also difficult, resulting in complex system configuration and high installation and operation and maintenance costs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an anti-corrosion protection design method and an anti-corrosion protection system for underground metal pipelines in view of the problems existing in the prior art.

[0007] In a first aspect, the present application provides a method for designing an anti-corrosion protection for an underground metal pipeline, comprising:

[0008] Construct an anti-corrosion protection system based on photovoltaic modules. The anti-corrosion protection system includes photovoltaic modules, auxiliary anodes and buried metal pipes. The positive pole of the photovoltaic module is connected to the auxiliary anode, and the negative pole of the photovoltaic module is connected to the buried metal pipe.

[0009] The DC power is obtained through the photovoltaic modules as the power supply of the anti-corrosion protection system; the DC current output by the photovoltaic modules flows into the underground soil through the auxiliary anode, and is conducted to the buried metal pipes through the underground soil, thereby realizing the cathodic protection of the buried metal pipes.

[0010] The beneficial effects of the present invention are as follows: photovoltaic modules are used to obtain direct current power as the power source for pipeline cathodic protection, and the photovoltaic modules are arranged along the pipeline path, which solves the technical problem of difficulty in obtaining power along the pipeline in the prior art; the principle of direct current voltage generated by photovoltaic modules under solar radiation is utilized, and the buried metal pipeline is connected to the negative electrode of the module, so that the buried metal pipeline presents a negative potential, making it difficult to be oxidized, thereby meeting the needs of anti-corrosion protection; and, the photovoltaic modules generate direct current voltage under solar radiation, and there is no need to additionally configure a rectifier device, which solves the technical problem of difficulty in installing and arranging the rectifier device in the prior art, simplifies the system configuration, and saves operation and maintenance costs.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the anti-corrosion protection design method for the buried metal pipeline provided in the present application also includes determining the power capacity of the photovoltaic module based on the surface area of ​​the buried metal pipeline.

[0013] The beneficial effect of adopting the above further scheme is that the capacity of the cathodic protection power supply is determined by the surface area of ​​the protected metal pipeline, and the use of photovoltaic modules to replace conventional power supplies can reduce equipment investment, operating costs and maintenance workload.

[0014] Further, the power capacity of the photovoltaic module is determined according to the surface area of ​​the buried metal pipeline, including: according to the surface area of ​​the buried metal pipeline, 15mA / m 2 , determine the power capacity of the PV panels.

[0015] The beneficial effect of adopting the above further solution is that 15mA / m 2 The recommended reference value is taken as follows. When applied in engineering, it is adjusted according to the soil corrosion resistivity and corrosion strength characteristics. During use, it can be further optimized according to the protection effect.

[0016] Furthermore, after determining the power capacity of the photovoltaic module, the required power capacity is achieved by adjusting the open circuit voltage and the number of series-connected modules of the photovoltaic module.

[0017] The beneficial effect of adopting the above further scheme is that the voltage of the photovoltaic module string can be adjusted by adjusting the string length, the size of the protection loop current can be adjusted by adjusting the loop resistance by adjusting the distance between the anode and the protection pipe, and the size of the protection current can be adjusted by a combination of voltage and resistance changes.

[0018] Furthermore, the anti-corrosion protection design method for the buried metal pipeline provided in the present application also includes determining the distance between the auxiliary anode and the buried metal pipeline according to the soil resistivity at the location of the buried metal pipeline.

[0019] The beneficial effect of adopting the above further solution is that the change in the distance between the auxiliary anode and the protected pipeline will change the resistance of the loop, and the current of the protection loop is limited by the change in resistance to play a role of cathodic protection.

[0020] Furthermore, the anti-corrosion protection design method for the buried metal pipeline provided in the present application also includes dividing the buried metal pipeline into different protection sections and respectively setting up photovoltaic components for each protection section.

[0021] The beneficial effect of adopting the above further solution is that when the required voltage is high, the photovoltaic components can be arranged in sections according to the range of the protected object to achieve the purpose of balancing the potential and reducing the voltage of the additional photovoltaic power supply.

[0022] Furthermore, the anti-corrosion protection system also includes a reference electrode, which is used to measure the potential of the buried metal pipeline.

[0023] The beneficial effect of adopting the above further solution is that the reference electrode is used to measure the potential of the protected metal structure, and common reference electrodes include copper sulfate reference electrode, silver / silver chloride reference electrode, etc. By placing the reference electrode close to the protected metal structure, its potential can be accurately measured.

[0024] Furthermore, the buried metal pipeline includes the buried metal pipeline itself and related metal structures.

[0025] The beneficial effect of adopting the above further scheme is that by setting up photovoltaic components between underground metal pipes or metal structures and the auxiliary anode, the photovoltaic components will generate DC voltage when irradiated by sunlight, thereby slowing down or eliminating the corrosion of underground metal pipes and metal structures.

[0026] In a second aspect, the present application also provides an anti-corrosion protection system for an underground metal pipeline, which is obtained by the anti-corrosion protection design method provided by the above technical solution. The anti-corrosion protection system includes: a photovoltaic module, an auxiliary anode and an underground metal pipeline, wherein the positive electrode of the photovoltaic module is connected to the auxiliary anode, and the negative electrode of the photovoltaic module is connected to the buried metal pipeline;

[0027] The DC power is obtained through the photovoltaic modules as the power supply of the anti-corrosion protection system; the DC current output by the photovoltaic modules flows into the underground soil through the auxiliary anode, and is conducted to the buried metal pipes through the underground soil, thereby realizing the cathodic protection of the buried metal pipes.

[0028] Based on the above technical solution, the present invention can also be improved as follows.

[0029] Further, the power capacity of the photovoltaic module is determined according to the surface area of ​​the buried metal pipe.

[0030] The beneficial effect of adopting the above further scheme is that the capacity of the cathodic protection power supply is determined by the surface area of ​​the protected metal pipeline, and the use of photovoltaic modules to replace conventional power supplies can reduce equipment investment, operating costs and maintenance workload.

[0031] Furthermore, the anti-corrosion protection system is based on the surface area of ​​the buried metal pipeline at 15mA / m 2 , determine the power capacity of the PV panels.

[0032] The beneficial effect of adopting the above further solution is that 15mA / m 2 The recommended reference value is taken as follows. When applied in engineering, it is adjusted according to the soil corrosion resistivity and corrosion strength characteristics. During use, it can be further optimized according to the protection effect.

[0033] Furthermore, the anti-corrosion protection system achieves the required power capacity by adjusting the open circuit voltage of the photovoltaic modules and the number of series connected modules.

[0034] The beneficial effect of adopting the above further scheme is that the voltage of the photovoltaic module string can be adjusted by adjusting the string length, the size of the protection loop current can be adjusted by adjusting the loop resistance by adjusting the distance between the anode and the protection pipe, and the size of the protection current can be adjusted by a combination of voltage and resistance changes.

[0035] Furthermore, the anti-corrosion protection system determines the distance between the auxiliary anode and the buried metal pipeline according to the soil resistivity at the location of the buried metal pipeline.

[0036] The beneficial effect of adopting the above further solution is that the change in the distance between the auxiliary anode and the protected pipeline will change the resistance of the loop, and the current of the protection loop is limited by the change in resistance to play a role of cathodic protection.

[0037] Furthermore, the anti-corrosion protection system divides the buried metal pipeline into different protection sections, and sets photovoltaic modules for each protection section.

[0038] The beneficial effect of adopting the above further solution is that when the required voltage is high, the photovoltaic components can be arranged in sections according to the range of the protected object to achieve the purpose of balancing the potential and reducing the voltage of the additional photovoltaic power supply.

[0039] Furthermore, the anti-corrosion protection system also includes a reference electrode, which is used to measure the potential of the buried metal pipeline.

[0040] The beneficial effect of adopting the above further solution is that the reference electrode is used to measure the potential of the protected metal structure, and common reference electrodes include copper sulfate reference electrode, silver / silver chloride reference electrode, etc. By placing the reference electrode close to the protected metal structure, its potential can be accurately measured.

[0041] Furthermore, the buried metal pipeline includes the buried metal pipeline itself and related metal structures.

[0042] The beneficial effect of adopting the above further scheme is that by setting up photovoltaic components between underground metal pipes or metal structures and the auxiliary anode, the photovoltaic components will generate DC voltage when irradiated by sunlight, thereby slowing down or eliminating the corrosion of underground metal pipes and metal structures.

[0043] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A flowchart of a method for designing an anti-corrosion protection for underground metal pipelines is shown as an exemplary embodiment of the present application;

[0045] Figure 2 A schematic structural diagram of an underground metal pipeline anti-corrosion protection system is shown as an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0047] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0048] Conventional buried pipelines use impressed current cathodic protection, which requires external power supply and rectifiers to be configured according to the protection current and voltage. For longer pipelines, it is not easy to obtain power along the pipeline, and it is also difficult to install and arrange the rectifier. The main reasons for the difficulty in installing and arranging the rectifier for cathodic protection include the following aspects:

[0049] Environmental conditions: Cathodic protection rectifiers are usually installed outdoors or in harsh environments, such as humid, high temperature, corrosive environments, which places high demands on the protection and installation foundation of the equipment. Special protective measures such as waterproofing, moisture-proofing, and anti-corrosion treatment are required, which increases the complexity of installation.

[0050] Strict safety requirements: Due to the current output and high voltage involved, the installation process needs to strictly follow electrical safety regulations to prevent dangers such as electric shock, short circuit and fire. This includes proper grounding, insulation treatment and keeping a safe distance from other facilities, which increases the difficulty and time cost of installation.

[0051] Space and location constraints: In some sites, the space available for installing the rectifier is limited and may need to compete with other equipment or pipelines for space. At the same time, in order to ensure that the current is evenly distributed to the protected structure, the location of the rectifier also needs to be carefully considered, which may be limited by factors such as terrain and existing facility layout.

[0052] Large weight and size: The cathodic protection rectifier itself has a certain weight and size, requiring a solid support structure and installation foundation. In some places where it is not convenient for construction, such as mountainous areas, remote areas or underground spaces, installing such large equipment will face difficulties in transportation and installation.

[0053] Complex wiring and connection: The rectifier needs to be connected to the protected structure, anode bed, power supply, etc., which involves long-distance cable wiring and complex connection processes. Ensuring good insulation of the cable, preventing electromagnetic interference, and the correct connection method all require delicate operations and professional techniques.

[0054] Interference and compatibility issues: In some places, there may be other electrical equipment or communication systems, and the operation of the rectifier may cause electromagnetic interference to them, or be interfered by them. Therefore, electromagnetic compatibility needs to be considered during installation and layout, and it may be necessary to add filtering, shielding and other measures, which increases the difficulty and cost of installation.

[0055] Maintenance and overhaul considerations: In order to facilitate future maintenance and overhaul, sufficient operating space and channels need to be reserved during installation. However, in the actual installation environment, it may be difficult to meet these requirements, resulting in inconvenience in subsequent maintenance work.

[0056] Figure 1The following is a flow chart of a method for designing an anti-corrosion protection for underground pipelines according to an exemplary embodiment of the present application. Figure 1 As shown, in an exemplary embodiment, the underground pipeline anti-corrosion protection design method may include steps S101 to S104, which are described in detail as follows:

[0057] The present application provides a method for designing an anti-corrosion protection for an underground metal pipeline, comprising:

[0058] S101, building a corrosion protection system based on photovoltaic modules;

[0059] In the embodiment of the present invention, the anti-corrosion protection system includes a photovoltaic module, an auxiliary anode and an underground metal pipeline, the positive electrode of the photovoltaic module is connected to the auxiliary anode, and the negative electrode of the photovoltaic module is connected to the underground metal pipeline.

[0060] S102, obtaining a direct current power source through a photovoltaic module as a power source for an anti-corrosion protection system;

[0061] S103, the direct current output by the photovoltaic module flows into the underground soil through the auxiliary anode;

[0062] S104, conducting the electric current through the underground soil to the buried metal pipeline, thereby realizing cathodic protection of the buried metal pipeline.

[0063] The embodiment of the present invention uses photovoltaic modules to obtain DC power as the power source for pipeline cathodic protection. The auxiliary anode is the electrode from which the current flows out, and is generally made of materials with good corrosion resistance, strong conductivity and large drainage, such as high silicon cast iron, graphite, etc. The current flows out from the auxiliary anode, passes through the soil or electrolyte solution, and enters the protected metal structure.

[0064] When direct current is applied to the protected metal structure, electrons flow into the metal structure, causing its potential to shift negatively. Electrochemically, the corrosion tendency of metals decreases as the potential shifts negatively. When the potential shifts negatively to a certain extent (i.e., reaches the protection potential), the anodic dissolution process (corrosion reaction) on the metal surface is significantly inhibited, thereby achieving cathodic protection.

[0065] In the embodiment of the present invention, photovoltaic modules are used to obtain direct current power as the power source for pipeline cathodic protection. The photovoltaic modules are arranged along the pipeline path, which solves the technical problem of difficulty in obtaining power along the pipeline in the prior art.

[0066] Utilizing the principle that photovoltaic modules generate DC voltage under solar radiation, the buried metal pipe is connected to the negative pole of the module, so that the buried metal pipe presents a negative potential, making it less likely to be oxidized, thereby achieving the need for anti-corrosion protection.

[0067] In addition, the photovoltaic modules generate DC voltage under solar radiation, and no additional rectifier device is required, which solves the technical problem of difficult installation and arrangement of rectifier devices in the prior art, simplifies system configuration, and saves operation and maintenance costs.

[0068] Optionally, the anti-corrosion protection design method for buried metal pipes provided in the embodiment of the present invention further includes determining the power capacity of the photovoltaic module according to the surface area of ​​the buried metal pipe. In the embodiment of the present invention, the cathodic protection power capacity is determined according to the surface area of ​​the protected metal pipe, and using photovoltaic modules to replace conventional power sources can reduce equipment investment, operating costs and maintenance workload.

[0069] Specifically, the surface area of ​​the buried metal pipe can be calculated at 15 mA / m 2 , determine the power capacity of the photovoltaic module. For the protection current, 15mA / m 2 The recommended reference value is taken as follows. When applied in engineering, it is adjusted according to the soil corrosion resistivity and corrosion strength characteristics. During use, it can be further optimized according to the protection effect.

[0070] Optionally, after determining the power capacity of the photovoltaic module, the required power capacity can be achieved by adjusting the open circuit voltage of the photovoltaic module and the number of series blocks. In the embodiment of the present invention, the voltage of the photovoltaic module string can be adjusted by adjusting the string length, and the magnitude of the protection loop current can be adjusted by adjusting the loop resistance by adjusting the distance between the anode and the protection pipe, and the magnitude of the protection current can be adjusted by a combination of voltage and resistance changes.

[0071] Optionally, the anti-corrosion protection design method for the buried metal pipeline provided in the embodiment of the present invention further includes determining the distance between the auxiliary anode and the buried metal pipeline according to the soil resistivity of the location of the buried metal pipeline. The specific formula is: R = ρ × L, where R is the resistance, ρ is the soil resistivity, and L is the distance between the auxiliary anode and the buried metal pipeline. In the embodiment of the present invention, the change in the distance between the auxiliary anode and the protected pipeline will change the resistance of the loop, and the change in resistance will limit the current of the protection loop to play a role in cathodic protection.

[0072] Optionally, the anti-corrosion protection design method for the buried metal pipeline provided by the embodiment of the present invention further includes dividing the buried metal pipeline into different protection sections, and respectively setting photovoltaic modules for each protection section. In the embodiment of the present invention, when the required voltage is high, the photovoltaic modules can be set in sections according to the range of the protected object to achieve the purpose of balancing the potential and reducing the voltage of the additional photovoltaic power supply.

[0073] Optionally, the anti-corrosion protection system provided by the embodiment of the present invention further includes a reference electrode, which is used to measure the potential of the protected metal structure. Common reference electrodes include a copper sulfate reference electrode, a silver / silver chloride reference electrode, etc. By placing the reference electrode close to the protected metal structure, its potential can be accurately measured.

[0074] For example, for steel pipelines, the protection potential is usually controlled between -0.85 volts and -1.2 volts (relative to the saturated copper sulfate reference electrode), which can effectively slow down the corrosion rate of the pipeline. In short, the impressed current method uses an external power supply to forcibly change the potential of the protected metal, making it in an electrochemically stable state, thereby achieving the purpose of preventing corrosion.

[0075] Optionally, the buried metal pipeline in the embodiment of the present invention includes the buried metal pipeline itself and related metal structures. The embodiment of the present invention slows down or eliminates the corrosion of the underground metal pipeline and metal structure by setting a photovoltaic module between the underground metal pipeline or metal structure and the auxiliary anode, and generating a DC voltage when the photovoltaic module is irradiated by sunlight.

[0076] like Figure 2 As shown, an embodiment of the present invention also provides an anti-corrosion protection system for an underground metal pipe, which is obtained by the anti-corrosion protection design method provided by the above technical solution. The anti-corrosion protection system includes: a photovoltaic module, an auxiliary anode and an underground metal pipe, the positive pole of the photovoltaic module is connected to the auxiliary anode, and the negative pole of the photovoltaic module is connected to the buried metal pipe.

[0077] In the embodiment of the present invention, a DC power source is obtained through a photovoltaic module as a power source for the anti-corrosion protection system; the DC current output by the photovoltaic module flows into the underground soil through an auxiliary anode, and is conducted through the underground soil to the buried metal pipe, thereby realizing cathodic protection of the buried metal pipe.

[0078] Optionally, the power capacity of the photovoltaic module is determined according to the surface area of ​​the buried metal pipeline. The cathodic protection power capacity is determined according to the surface area of ​​the protected metal pipeline. Using photovoltaic modules to replace conventional power sources can reduce equipment investment, operating costs and maintenance workload.

[0079] Optionally, the anti-corrosion protection system is based on the surface area of ​​the buried metal pipeline at 15mA / m 2 , determine the power capacity of the photovoltaic module. For the protection current, 15mA / m 2 The recommended reference value is taken as follows. When applied in engineering, it is adjusted according to the soil corrosion resistivity and corrosion strength characteristics. During use, it can be further optimized according to the protection effect.

[0080] Optionally, the anti-corrosion protection system achieves the required power capacity by adjusting the open circuit voltage of the photovoltaic module and the number of series blocks. The voltage of the photovoltaic module string can be adjusted by adjusting the string length, and the magnitude of the protection loop current can be adjusted by adjusting the loop resistance by adjusting the distance between the anode and the protection pipeline. The magnitude of the protection current can be adjusted by a combination of voltage and resistance changes.

[0081] Optionally, the anti-corrosion protection system determines the distance between the auxiliary anode and the buried metal pipeline according to the soil resistivity of the buried metal pipeline. The change in the distance between the auxiliary anode and the protected pipeline will change the resistance of the loop, and the current of the protection loop is limited by the change in resistance to play a role of cathodic protection.

[0082] Optionally, the anti-corrosion protection system divides the buried metal pipeline into different protection sections, and sets photovoltaic modules for each protection section. When the required voltage is high, the photovoltaic modules can be set in sections according to the range of the protected object to achieve the purpose of balancing the potential and reducing the voltage of the additional photovoltaic power supply.

[0083] Optionally, the anti-corrosion protection system also includes a reference electrode, which is used to measure the potential of the buried metal pipeline. Common reference electrodes include copper sulfate reference electrode, silver / silver chloride reference electrode, etc. By placing the reference electrode close to the protected metal structure, its potential can be accurately measured.

[0084] Optionally, the buried metal pipeline includes the buried metal pipeline itself and related metal structures. In the embodiment of the present invention, by setting a photovoltaic module between the underground metal pipeline or metal structure and the auxiliary anode, the photovoltaic module generates a DC voltage when irradiated by sunlight to slow down or eliminate the corrosion of the underground metal pipeline and metal structure.

[0085] In the embodiment of the present invention, photovoltaic modules are used to obtain direct current power as the power source for pipeline cathodic protection. The photovoltaic modules are arranged along the pipeline path, which solves the technical problem of difficulty in obtaining power along the pipeline in the prior art.

[0086] Utilizing the principle that photovoltaic modules generate DC voltage under solar radiation, the buried metal pipe is connected to the negative pole of the module, so that the buried metal pipe presents a negative potential, making it less likely to be oxidized, thereby achieving the need for anti-corrosion protection.

[0087] In addition, the photovoltaic modules generate DC voltage under solar radiation, and no additional rectifier device is required, which solves the technical problem of difficult installation and arrangement of rectifier devices in the prior art, simplifies system configuration, and saves operation and maintenance costs.

[0088] The embodiment of the present invention adopts photovoltaic modules to perform cathodic protection of pipelines. Compared with the cathodic protection method of the external power supply method, it saves external power supply consumption, does not require rectification equipment, simplifies system configuration, and saves operation and maintenance costs.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for designing anti-corrosion protection of underground metal pipelines, characterized in that: include: Constructing an anti-corrosion protection system based on a photovoltaic module, the anti-corrosion protection system comprising a photovoltaic module, an auxiliary anode and an underground metal pipeline, wherein the positive electrode of the photovoltaic module is connected to the auxiliary anode, and the negative electrode of the photovoltaic module is connected to the underground metal pipeline; A direct current power source is obtained through a photovoltaic module as the power source of the anti-corrosion protection system; the direct current output by the photovoltaic module flows into the underground soil through the auxiliary anode, and is conducted to the buried metal pipeline through the underground soil, thereby realizing cathodic protection of the buried metal pipeline.

2. The anti-corrosion protection design method for buried metal pipelines according to claim 1 is characterized in that: The method also includes determining the power capacity of the photovoltaic assembly according to the surface area of ​​the buried metal pipeline.

3. The anti-corrosion protection design method for buried metal pipelines according to claim 2 is characterized in that: The step of determining the power capacity of the photovoltaic assembly according to the surface area of ​​the buried metal pipe comprises: According to the surface area of ​​the buried metal pipe, 15mA / m 2 , determine the power capacity of the photovoltaic module.

4. The anti-corrosion protection design method for buried metal pipelines according to claim 3 is characterized in that: After the power capacity of the photovoltaic module is determined, the required power capacity is achieved by adjusting the open circuit voltage and the number of series-connected modules of the photovoltaic module.

5. The anti-corrosion protection design method for buried metal pipelines according to claim 1 is characterized in that: The method also includes determining the distance between the auxiliary anode and the buried metal pipeline according to the soil resistivity at the location of the buried metal pipeline.

6. The anti-corrosion protection design method for buried metal pipelines according to claim 1 is characterized in that: The method also includes dividing the buried metal pipeline into different protection sections, and respectively setting a photovoltaic component for each protection section.

7. The anti-corrosion protection design method for buried metal pipelines according to any one of claims 1 to 6, characterized in that: The anti-corrosion protection system also includes a reference electrode, which is used to measure the potential of the buried metal pipeline.

8. The anti-corrosion protection design method for buried metal pipelines according to any one of claims 1 to 6, characterized in that: The buried metal pipeline includes the buried metal pipeline itself and related metal structures.

9. An anti-corrosion protection system for underground metal pipelines, characterized in that: Obtained by the anti-corrosion protection design method according to any one of claims 1 to 8, the anti-corrosion protection system comprises: a photovoltaic module, an auxiliary anode and an underground metal pipeline, the positive electrode of the photovoltaic module is connected to the auxiliary anode, and the negative electrode of the photovoltaic module is connected to the underground metal pipeline; A direct current power source is obtained through a photovoltaic module as the power source of the anti-corrosion protection system; the direct current output by the photovoltaic module flows into the underground soil through the auxiliary anode, and is conducted to the buried metal pipeline through the underground soil, thereby realizing cathodic protection of the buried metal pipeline.

10. The anti-corrosion protection system for buried metal pipelines according to claim 9, characterized in that: The power capacity of the photovoltaic assembly is determined according to the surface area of ​​the buried metal pipe.

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