Regional cathode protection structure

Abstract

The invention relates to the technical field of pipeline cathode protection, in particular to a regional cathode protection structure. The regional cathode protection structure comprises a workshop, an anode ground bed and a plurality of cathode pipelines, a shunt cabinet and a protection power supply are arranged in the workshop, the shunt cabinet and the anode ground bed are respectively connected to a cathode and an anode of an output end of the protection power supply, and the shunt cabinet shunts output current of the protection power supply into a plurality of output branches. A plurality of connecting points are arranged on the shallow buried pipeline and the surface sleeve in the cathode pipeline; and each connecting point is connected with one output branch. According to the regional cathode protection structure provided by the invention, the shunt cabinet is arranged, the output of the protection power supply is divided into a plurality of output branches, and cathode protection of all equipment in a certain region can be completed only by arranging one protection power supply in the region; and the output branches are connected to the shallow buried pipeline and the surface sleeve respectively, so that three-dimensional protection of cathode protection can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline cathodic protection, in particular to a regional cathodic protection structure. BACKGROUND

[0002] In the production process of oil field, in order to protect the long distance oil and gas pipeline and other deep underground industrial pipeline or large storage tank and other large equipment, prevent its corrosion due to environmental influence and other reasons after a long time of work, often use impressed current cathodic protection technology, through the external power supply changes the environment potential, the electrons of anode are continuously transported to the protected large equipment, as the anode bed metal instead of the protected object is corroded to prolong the service life of the protected object. In the prior art, the protected object and the anode are connected to the positive and negative poles of the constant potential instrument respectively to form a loop connected with the ground, but due to the structure limitation of the device, in the existing cathodic protection technology, a constant potential instrument can only be connected with a group of anodes and protection circuit to form a loop, and a constant potential instrument only has one output line, which can only be connected with more important buried pipeline to protect the deep buried pipeline. The protection ability for shallow buried pipeline is very limited.

[0003] In actual work, when the equipment needing to be protected as cathode is distributed more densely, a group of cathodic protection systems need to be established for each object, and multiple constant potential instruments work at the same time in the same area, which is large load for the power system in the area and needs high investment.

[0004] Therefore, in view of the above problems, a regional cathodic protection structure is provided. SUMMARY

[0005] (I) Technical problems to be solved In view of the problems of the prior art, the present application provides a regional cathodic protection structure, which solves the problems that the cathodic protection system can only protect the deep buried pipeline and the protection effect for the shallow buried pipeline is not ideal, and solves the problems that the investment is high and the working efficiency is low due to mutual influence when multiple cathodic protection systems work at the same time in the same area.

[0006] (II) Technical scheme In order to solve the above problems, the present application provides a regional cathodic protection structure, comprising: a working room, an anode bed and a plurality of cathode pipelines, the working room is provided with a protection power supply and a shunt cabinet, the positive pole of the protection power supply is connected to the anode bed, and the cathode is connected to the input end of the shunt cabinet; the shunt cabinet is provided with a plurality of output ends to shunt the input electric signal of the protection power supply into a plurality of output branches; the cathode pipeline comprises a shallow buried pipeline and a surface sleeve, and a plurality of connection points are arranged on the shallow buried pipeline and the surface sleeve, and each connection point is connected with an output branch.

[0007] Preferably, each output branch of the distribution cabinet is equipped with a control system.

[0008] Preferably, the control system includes a control switch, an ammeter, a potential controller, and a circuit breaker.

[0009] Preferably, the work area is located at the center of the line connecting the locations of the cathode pipes.

[0010] Preferably, the work area is located in the station area near the site.

[0011] Preferably, the anode ground bed is a bimetallic auxiliary anode, which includes a start-up anode and a running anode, and the start-up anode and the running anode are insulated from each other.

[0012] Preferably, a switching device is provided between the starting anode and the running anode. The input terminal of the switching device is connected to the positive terminal of the protection power supply, and the two output terminals are connected to the starting anode and the running anode, respectively.

[0013] Preferably, the starting anode is made of corrosion-resistant steel, and the operating anode is made of high-silicon cast iron.

[0014] (III) Beneficial Effects The regional cathodic protection structure provided by this invention, by setting a shunt cabinet after the protective power supply, can split the output of the protective power supply into several output branches. Each output branch can be connected to a device that needs to be protected to form a cathodic protection system. Only one protective power supply is needed in a certain area to complete the cathodic protection of all devices in the area, reducing the initial investment in construction. By setting connection points on the shallow buried pipeline and the surface sleeve respectively and connecting the connection points to the output branches, the shallow layer can be protected, thus expanding the protection range. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the location of the regional cathodic protection structure of the present invention; Figure 2 This is a schematic diagram of the regional cathodic protection structure of the present invention.

[0016] The components include: 1. Working chamber; 2. Anode ground bed; 3. Cathode pipeline; 4. Protective power supply; 5. Diverter cabinet; 6. Output branch; 7. Shallow buried pipeline; 8. Surface sleeve. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top", and "bottom" are based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this invention and to simplify the description. It is not intended to indicate or imply that the component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0019] like Figures 1-2 As shown, the present invention provides a regional cathodic protection structure, specifically comprising: The circuit consists of a working chamber 1, an anode ground bed 2, and several cathode pipes 3. When current is passed between the anode ground bed 2 and the cathode pipes 3, the direction of the current can change the flow of electrons in the circuit. After the current in the anode ground bed 2 is transferred to the cathode pipes 3, the cathode pipes 3 maintain a higher potential than the surrounding environment over time, making them less susceptible to corrosion. Meanwhile, the anode ground bed 2 undergoes an oxidation reaction, replacing the cathode pipes 3 in being corroded by the surrounding environment, thus protecting the cathode pipes 3.

[0020] The work area 1, serving as the center of the cathodic protection structure, is used to install and house various instruments required within the structure. This prevents corrosion and damage to the instruments from the working environment and avoids malfunctions that could cause the cathodic protection structure to fail. Furthermore, sufficient space is typically reserved during construction of work area 1 so that new equipment can be installed or old equipment maintained directly within it when production or working environments change, thus improving the practicality of the cathodic protection structure.

[0021] It is important to note that the work area 1 is typically determined after identifying the area requiring cathodic protection and the locations of the cathode pipes 3 within that area. The selected work area 1 is usually located at the center of the line connecting the locations of all the cathode pipes 3. This ensures that the distance between the work area 1 and each cathode pipe 3 is relatively even and minimizes the distance between them, reducing the total workload and investment when connecting the equipment within the work area 1 to the cathode pipes 3, thus improving the economic efficiency during construction. Furthermore, if a metering room exists nearby, the work area 1 can be directly established within it. This saves on construction costs, further improving economic efficiency, and also allows for integration with the equipment within the metering room. The existing wiring within the metering room can be used to connect to some of the cathode pipes 3, reducing the workload and operational difficulty during the connection process.

[0022] The work area 1 is equipped with a protective power supply 4 and a shunt cabinet 5. After the protective power supply 4 is connected to the DC power supply at the work site, it can output a constant DC current through the positive and negative terminals of the output terminal. The protective power supply 4 is generally a potentiostat. After the positive and negative terminals of the protective power supply 4 are connected to the anode ground bed 2 and the cathode pipe 3 respectively, a constant DC current of constant magnitude and direction can be formed between the anode ground bed 2 and the cathode pipe 3, thereby realizing a cathodic protection structure in which the electronic wires in the anode ground bed 2 are protected by the cathode pipe 3 by sacrificing the anode ground bed 2. The shunt cabinet 5 can shunt the input current. The shunt cabinet 5 is equipped with several output branches 6 and one input terminal. After connecting the input terminal to the cathode of the output terminal of the protection power supply 4, the current output by the protection power supply 4 can be shunt to each output branch 6. Each output branch 6 can form a relatively independent cathodic protection structure after being connected to the cathode pipe 3. Only one protection power supply 4 is needed to guide the current in the anode ground bed 4 to multiple cathode pipes 3 for protection. It is not necessary to install a potentiostat for each cathode pipe 3 separately, which reduces the economic investment in potentiostats and reduces the load on the power system in the protected area when multiple potentiostats work at the same time, further improving the safety of the cathodic protection structure.

[0023] Each output branch 6 of the shunt cabinet 5 is equipped with a control system. The control system is used to control the current output and operation of the corresponding output branch 6. Depending on the specific operation and location of each cathode pipe 3, the current and potential required during the cathodic protection process are not the same. At this time, the control system can adjust the current and potential output of the corresponding output branch 6 to meet the requirements of the protected cathode pipe 3, thereby improving the practicality of the cathodic protection structure and the efficiency of the cathodic protection operation.

[0024] It should be noted that the control system includes a control switch, an ammeter, a potential controller, and a circuit breaker. The control switch controls the connection status of the corresponding output branch 6. When maintenance work is performed and the connection to the cathodic protection structure needs to be disconnected, simply disconnecting the control switch of the corresponding output branch 6 is sufficient. This disconnects the connection to the cathodic protection structure without affecting the normal operation of other output branches 6, demonstrating good practicality. The ammeter is used to monitor the current magnitude on the output branch 6 in real time and can also be used as a basis for adjusting the current magnitude on the output branch 6. The potential controller is used to adjust the output potential magnitude on the output branch 6. Through the potential controller, although only one protective power supply 4 is used, each output branch 6 can adjust the output potential magnitude to an appropriate value according to the working status and requirements of its connected cathode pipe 3. This maximizes the working efficiency of cathodic protection while extending the service life of each device through appropriate operating points. The circuit breaker is used to protect the output branch 6 from current. When the current in the output branch 6 exceeds the rated current of the circuit breaker, the circuit breaker will disconnect and cut off the corresponding output branch 6 to prevent the excessive current in the output branch 6 from causing equipment damage or overheating of the line and causing an accident.

[0025] like Figure 2 As shown, the cathode conduit 3 includes a shallow buried conduit 7 and a surface sleeve 8. Both the shallow buried conduit 7 and the surface sleeve 8 have several connection points, each connected to an output branch 6. By providing connection points on the shallow buried conduit 7 and the surface sleeve 8 and connecting these points to the output branch 6, the cathodic protection structure can simultaneously protect both the shallow buried conduit 7 and the surface sleeve 8, instead of only protecting the relatively important and easily corroded inter-station conduits.

[0026] In this invention, the anode bed 2 includes a starting anode and a running anode, which are insulated from each other. When cathodic protection technology first starts working, the current is high during the startup phase. Subsequently, as the system gradually stabilizes, the current gradually decreases and remains stable. The starting anode is generally made of an economical material. In the initial stage of cathodic protection operation, the starting anode is typically used, as the operating current is high, resulting in significant metal consumption. Using an economical material effectively reduces operating costs. The running anode is generally made of a high-efficiency material, typically a precious metal or metal alloy, which provides more stable efficiency during operation. Once the operating current in the system stabilizes, the system switches to the running anode for routine operation. The mutual insulation between the starting and running anodes prevents mutual interference between the two anodes, improving the efficiency of cathodic protection.

[0027] A switching device is provided between the starting anode and the operating anode. The two input terminals of the switching device are connected to the starting anode and the operating anode, respectively, and the output terminal is connected to the positive terminal of the protection power supply 4. The switching device is used to switch the operating state between the starting anode and the operating anode. In the initial stage of cathodic protection, the switching device is adjusted to the starting anode end. At this time, the operating current in the system is relatively large, and the starting anode is rapidly consumed. When the current gradually decreases and remains stable, the switching device is adjusted to the operating anode end. At this time, the operating current in the system is lower, and the operating anode can produce better working performance while maintaining low consumption.

[0028] It is important to note that, generally, the starting anode is made of corrosion-resistant steel, while the operating anode is made of high-silicon cast iron. During operation, the silicon in the high-silicon cast iron can generate a large-area hydrated silica protective film on the surface of the operating anode. This silica protective film contains many tiny micropores, through which electrolytes can enter the metal surface, repeatedly undergoing silicon oxidation reactions to generate new oxide protective films. However, when the current increases, the water in the soil surrounding the anode is electrolyzed, causing the soil to become alkaline. Since the silica protective film is soluble in an alkaline environment, prolonged exposure to an alkaline environment will significantly increase its consumption. Therefore, during the initial startup phase, the starting anode is generally switched to operation. To improve the efficiency of the device, a drag-reducing agent, typically carbon black, is filled around the anode when setting up the anode bed 2. This agent reduces the air resistance of the surrounding environment, further improving the efficiency and service life of the anode bed 2.

[0029] The regional cathodic protection structure provided by this invention can simultaneously provide cathodic protection for shallow buried pipelines and surface casings, and can protect all cathodic pipelines within a certain range with only one potentiostat. The specific operation process of this structure is as follows: Step 1: Delineate the protection area according to the work plan, and select a suitable location within the protection area to establish a workspace.

[0030] Step 2: Deeply bury the anode ground bed and fill the area around it with a resistance-reducing agent. Install the protective power supply and shunt cabinet in the work area and connect the shunt cabinet, protective power supply, and anode ground bed in sequence. At this time, the anode and cathode of the protective power supply are connected to the input terminals of the anode ground bed and the shunt cabinet, respectively. After the protective power supply is energized, it can output a constant DC working current to the anode ground bed and the shunt cabinet.

[0031] Step 3: Count the cathode pipes within the protection range and set several connection points on each cathode pipe. Connect each connection point to the output branch of a shunt cabinet to form a loop.

[0032] Step 4: Switch the working anode of the anode bed to the starting anode and start the protection power supply. During this process, the operating current in the device is relatively large. Under the action of the current, electrons inside the starting anode are transferred to the cathode pipe to protect the cathode pipe. At the same time, the starting anode consumes a large amount of power.

[0033] Step 5: After the operating current stabilizes, switch the starting anode to the running anode. At this time, as the operating current in the system gradually decreases and stabilizes, the running anode consumes less power and can operate stably for a long time under these conditions, avoiding the economic losses caused by the running anode consuming a large amount of power in the early stages of operation.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A regional cathodic protection structure, characterized in that, include: The room (1), the anode bed (2), and several cathode pipes (3) are provided. The room (1) is equipped with a protective power supply (4) and a shunt cabinet (5). The positive terminal of the protective power supply (4) is connected to the anode bed (2), and the cathode is connected to the input terminal of the shunt cabinet (5). The shunt cabinet (5) is equipped with several output terminals to divide the input current of the protective power supply (4) into several output branches (6). The cathode pipes (3) include shallow buried pipes (7) and surface sleeves (8). Several connection points are provided on both the shallow buried pipes (7) and the surface sleeves (8), and each connection point is connected to an output branch (6).

2. The regional cathodic protection structure according to claim 1, characterized in that, Each output branch (6) of the distribution cabinet (5) is equipped with a control system.

3. The regional cathodic protection structure according to claim 2, characterized in that, The control system includes a control switch, an ammeter, a potential controller, and a circuit breaker.

4. The regional cathodic protection structure according to claim 1, characterized in that, The work area (1) is located at the center of the line connecting the positions of each cathode pipe (3).

5. The regional cathodic protection structure according to claim 4, characterized in that, The workshop (1) is located in the station area near the site.

6. The regional cathodic protection structure according to claim 1, characterized in that, The anode bed (2) is a bimetallic auxiliary anode. The anode bed (2) includes a start-up anode and a running anode, which are insulated from each other.

7. The regional cathodic protection structure according to claim 6, characterized in that, A switching device is provided between the starting anode and the running anode. The input end of the switching device is connected to the positive terminal of the protection power supply (4), and the two output ends are connected to the starting anode and the running anode respectively.

8. The regional cathodic protection structure according to claim 7, characterized in that, The starting anode is made of corrosion-resistant steel, and the operating anode is made of high-silicon cast iron.

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