Deep well anode ground bed for drought environment

Abstract

The utility model provides a deep-well anode ground bed for a drought environment, which relates to the technical field of electrochemical equipment, and compared with the traditional deep-well anode ground bed, the deep-well anode ground bed for the drought environment adopts a pre-packaged anode form. Comprising an anti-explosion junction box, a sleeve, a prefabricated anode assembly, an exhaust pipe and a cable pipe, the prefabricated anode assembly, the exhaust pipe and the cable pipe are arranged in the sleeve, the prefabricated anode assembly is electrically connected with the anti-explosion junction box through a cable, and compared with a traditional deep well anode ground bed, a water injection pipe is further arranged in the sleeve and used for injecting water into the deep well anode ground bed at different depths; the casing pipe is arranged at the bottom of the deep well anode ground bed to reduce the soil resistivity around the deep well anode ground bed, meanwhile, a soil resistivity measurer is further arranged at the bottom of the casing pipe, the soil resistivity measurer is electrically connected with the anti-explosion junction box through a cable, and the soil resistivity measurer can automatically measure the soil resistivity and feed back a result to the anti-explosion junction box on the ground. The defect that in the prior art, after a deep well anode ground bed is built, the resistivity of soil around the anode ground bed cannot be measured is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical equipment, in particular to an anode bed for deep wells in arid environments. Background Art

[0002] Impressed current cathodic protection (ICP) is widely used in buried long-distance oil and gas pipelines and storage tanks at stations due to its high reliability, long life, adjustable output voltage and current, and easy maintenance. Anode beds are the installation and placement of anodes in ICP. Deep-well anode beds, as a key component of cathodic protection systems, feature a small construction area and relatively uniform distribution of protection potential, making them widely used. A deep-well anode bed specifically refers to the vertical installation of one or more anodes in deep underground wellbores (typically greater than 15 meters deep). Auxiliary anodes can be made from high-silicon cast iron, mixed metal oxide, or graphite, and are available in rod and tubular shapes. Currently, most anodes are pre-packaged in steel casings for installation, reducing on-site construction workload and ensuring anode assembly quality and performance. Coke powder is packed around the auxiliary anodes in the steel casing to reduce the anode's ground resistance, extend its service life, and reduce anode gas resistance.

[0003] Deep-well anodes are often used in environments where surface soil resistivity is high or where limited surface space makes it difficult to install shallow-buried anode beds and meet the required anode grounding resistance. Their advantages include a small footprint, a large protection area, low grounding resistance, uniform protection current distribution, low surface potential gradients, and relatively minimal interference with other metal structures. Their disadvantages are that they require specific geological conditions, are complex to construct, require a first-time success, and are difficult to repair or replace. In densely populated areas, they tend to polarize the entire protected area, with higher polarization at the edges of the protected area and lower polarization at the center of dense pipeline networks due to the dense concentration of pipelines and grounding bodies. According to the "GB / T 21448 Technical Specification for Cathodic Protection of Buried Steel Pipelines" and the "SY / T 0096 Technical Specification for Forced Current Deep-well Anode Beds," the design, installation, operation, and maintenance of deep-well anode beds should use the soil resistivity at the midpoint of the anode section to calculate the bed grounding resistance and analyze the impact of soil resistivity differences at different layers.

[0004] In the prior art, soil resistivity in the middle and bottom of a deep well is typically measured only once during the survey and design phase prior to deep-well anode installation. It is not measured again after the anode is installed and backfilled. Utility model patents with publication numbers CN208379009U, entitled "A Deep-Well Anode Bed," and CN207811875U, entitled "A Deep-Well Anode Bed Structure for Natural Gas Pipeline Corrosion Protection," both describe the structure of the anode bed. However, in arid regions, soil resistivity is far greater than normal, and there are no convenient means of measuring or effective measures for adjusting it. Soil resistivity directly affects loop resistance, making it very likely that despite a high output voltage, the protection potential of the protected object will not meet the standard. Furthermore, as deep-well anodes age, anode products such as chlorine, oxygen, carbon monoxide, and carbon dioxide are continuously generated due to anode reactions. The amount of gas produced is proportional to the anode output current. If the gas pipe is blocked, the gas cannot be discharged in time, and the anode is surrounded by gas, which reduces the contact between the anode and the electrolyte, resulting in an increase in loop resistance, reduced anode current release, and increased output voltage of the power supply equipment. The existence of gas resistance greatly affects the normal operation of deep well anodes and may even cause the anode system to malfunction. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a deep well anode ground bed for arid environments, so as to solve the technical problems in the existing technology of deep well ground beds in arid areas, that is, the soil resistivity is much greater than the normal level, resulting in the protection potential of the protected body not meeting the standard, and as the deep well anode is put into use for an increasing number of years, the gas duct is easily blocked, and the anode is surrounded by gas, which will reduce the contact between the anode and the electrolyte, resulting in an increase in the loop resistance, a reduction in the release of the anode current, and an increase in the output voltage of the power supply equipment.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a deep well anode bed for arid environments, comprising an explosion-proof junction box, a casing, and a prefabricated anode assembly and an exhaust pipe arranged in the casing. The prefabricated anode assembly is electrically connected to the explosion-proof junction box via a cable. A water injection pipe is also provided in the casing. A soil resistivity meter is provided at the bottom of the casing, and the soil resistivity meter is electrically connected to the explosion-proof junction box via a cable.

[0007] Optionally, the prefabricated anode assembly includes a prefabricated anode body, a precious metal oxide anode and a carbon filler, the prefabricated anode body is a cylindrical structure, the precious metal oxide anode is arranged on the central axis of the prefabricated anode body, and the carbon filler is filled between the prefabricated anode body and the precious metal oxide anode, and the exhaust pipe and the water injection pipe are both placed in the carbon filler.

[0008] Optionally, it further comprises a cable sheath, which is placed in the carbon filler and has an anode lead cable in it. The prefabricated anode body and the noble metal oxide anode are electrically connected to the explosion-proof junction box via the anode lead cable.

[0009] Optionally, the water injection pipe, the cable casing and the exhaust pipe are distributed in an array around the noble metal oxide anode.

[0010] Optionally, a positioning frame is further provided in the prefabricated anode body, and the positioning frame is arranged along the radial direction of the prefabricated anode body, and the positioning frame is used to position the noble metal oxide anode.

[0011] Optionally, a plurality of water injection pipe drainage holes are provided on the side wall of the water injection pipe, and the aperture of the water injection pipe drainage holes is φ10mm~φ20mm.

[0012] Optionally, the cable between the soil resistivity meter and the explosion-proof junction box is set as a soil resistivity measurement cable.

[0013] Optionally, the casing is a steel casing.

[0014] Optionally, a well protection casing is provided on the upper portion of the steel casing, and the well protection casing is filled with gravel filler.

[0015] Optionally, the wellhead is located above the well protection casing, and the wellhead is composed of a concrete cover plate and a concrete casing.

[0016] The deep well anode bed for arid environments provided by the utility model has the following technical effects:

[0017] This deep well anode ground bed for arid environments is similar to traditional deep well anode ground beds in that both include an explosion-proof junction box, a casing, and a prefabricated anode assembly and an exhaust pipe arranged in the casing. The prefabricated anode assembly is electrically connected to the explosion-proof junction box through a cable. Compared with traditional deep well anode ground beds, the utility model is different in that a water injection pipe is also provided in the casing, and the water injection pipe is used to inject water into the deep well anode ground bed at different depths to reduce the soil resistivity around the deep well anode ground bed. At the same time, a soil resistivity meter is also provided at the bottom of the casing, and the soil resistivity meter is electrically connected to the explosion-proof junction box through a cable. The soil resistivity meter can automatically measure the soil resistivity and feed the result back to the explosion-proof junction box on the ground, overcoming the defect in the prior art that the soil resistivity around the deep well anode ground bed cannot be measured after the deep well anode ground bed is built. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the deep well anode bed for arid environments of the utility model;

[0020] Figure 2 yes Figure 1 Cross-sectional view of the deep well anode bed for moderate arid environment along the AA direction;

[0021] Figure 3 yes Figure 1 Cross-sectional view of the deep well anode bed for moderate arid environment along the BB direction;

[0022] Figure 4 yes Figure 1 Schematic diagram of the side cross-section structure of a deep well anode bed for moderately arid environments.

[0023] in, Figures 1-4 :

[0024] 1. Concrete cover plate; 2. Concrete casing; 3. Undisturbed soil; 4. Cable casing; 5. Exhaust pipe; 6. Water injection pipe; 7. Anode lead cable; 8. Explosion-proof junction box; 9. Well casing; 10. Gravel filler; 11. Prefabricated anode body; 12. Precious metal oxide anode; 13. Carbon filler; 14. Casing; 15. Positioning frame; 16. Soil resistivity meter; 17. Soil resistivity measurement cable; 18. Water injection pipe drainage hole; 19. Prefabricated anode body drainage hole. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] As described in the background, prior art typically measures soil resistivity in the middle and bottom of a deep well only once during the survey and design phase before deep-well anode installation. It is not measured again after the anode is installed and backfilled. However, in arid regions, soil resistivity is far greater than normal, and there are no convenient means for measuring or effective measures for adjusting it. Soil resistivity directly affects loop resistance, potentially resulting in a deep-well anode system with a high output voltage but substandard protection potential for the protected object. Furthermore, as deep-well anodes age, anode reactions continuously generate anode products such as chlorine, oxygen, carbon monoxide, and carbon dioxide. The amount of gas generated is proportional to the anode output current. If the gas conduit becomes blocked, gas cannot be promptly discharged, and the anode is surrounded by gas, reducing contact between the anode and the electrolyte, leading to increased loop resistance, reduced anode current release, and increased output voltage of the power supply. This gas resistance significantly impacts the proper operation of deep-well anodes and can even cause the anode system to malfunction.

[0027] Based on this, the utility model provides a deep well anode bed for arid environments. Compared with the traditional deep well anode bed, the utility model is different in that a water injection pipe is also provided in the casing of the utility model. The water injection pipe is used to inject water into the deep well anode bed at different depths to reduce the soil resistivity around the deep well anode bed. At the same time, a soil resistivity meter is also provided at the bottom of the casing. The soil resistivity meter is electrically connected to the explosion-proof junction box through a cable. The soil resistivity meter can automatically measure the soil resistivity and feed back the result to the explosion-proof junction box on the ground, overcoming the defect in the prior art that the soil resistivity around the deep well anode bed cannot be measured after the deep well anode bed is built.

[0028] The following is combined with specific Figure 1-4 The structure of the deep well anode ground bed for arid environment of the utility model is described in detail.

[0029] like Figure 1 As shown, it is a structural schematic diagram of a preferred embodiment of the deep well anode bed for arid environment of the utility model. The deep well anode bed for arid environment includes an explosion-proof junction box 8, a casing 14 and a prefabricated anode assembly and an exhaust pipe 5 arranged in the casing 14. The prefabricated anode assembly specifically includes a prefabricated anode body 11, a precious metal oxide anode 12 and a carbon filler 13. The prefabricated anode body 11 is a cylindrical structure, the precious metal oxide anode 12 is arranged on the central axis of the prefabricated anode body 11, and the carbon filler 13 is filled between the prefabricated anode body 11 and the precious metal oxide anode 12. The exhaust pipe 5 is installed in the carbon filler 13 along the length direction of the prefabricated anode body 11.

[0030] The casing 14 of this embodiment is preferably a steel casing 14 .

[0031] The precious metal oxide anode can also be made of high silicon cast iron anode or other materials.

[0032] The prefabricated anode body 11 of this embodiment is further provided with a positioning frame 15. Figure 3 and Figure 4 As shown, the positioning frame 15 is used to position the noble metal oxide anode 12 , and the positioning frame 15 is arranged along the radial direction of the prefabricated anode body 11 .

[0033] The prefabricated anode body 11 of this embodiment has a prefabricated anode body drainage hole 19. Through the opening in the water injection pipe, water can diffuse into the carbon filler of the prefabricated anode body during injection. Then, through the drainage hole in the prefabricated anode body, it can diffuse into the gravel filler in the deep well, thereby moistening the soil environment around the anode body and reducing soil resistivity.

[0034] like Figure 2-4 As shown, it also includes a cable sleeve 4, which is placed in the carbon filler 13. The cable sleeve 4 is provided with an anode lead cable 7. The prefabricated anode body 11 and the noble metal oxide anode 12 are electrically connected to the explosion-proof junction box 8 through the anode lead cable 7.

[0035] In addition, Figure 2-4 As shown, a water injection pipe 6 is also provided in the casing 14, and the water injection pipe 6 is also installed in the carbon filler 13 along the length direction of the prefabricated anode body 11. A plurality of water injection pipe drainage holes 18 are provided on the side wall of the water injection pipe 6. The water injection pipe drainage holes 18 are arranged along the axial direction of the water injection pipe 6. The distance between adjacent water injection pipe drainage holes 18 is about 20 cm. The aperture of the water injection pipe drainage hole 18 is φ10mm-φ20mm. If the aperture of the water injection pipe drainage hole 18 is too small, it is not conducive to the diffusion of water to the surroundings during water injection. If the aperture is too large, the water in the lower layer diffuses too quickly, making it difficult to store water in the upper layer.

[0036] It should be noted that the water injection pipe 6 in this embodiment is generally made of PVC. Other materials can be selected if there are other special requirements, and the present invention does not limit this.

[0037] like Figure 1 As shown, a soil resistivity meter 16 is provided at the bottom of the casing 14. The soil resistivity meter 16 is electrically connected to the explosion-proof junction box 8 via a cable. The cable between the soil resistivity meter 16 and the explosion-proof junction box 8 is provided as a soil resistivity measurement cable 17. The soil resistivity meter 16 of this embodiment can automatically measure the soil resistivity and feed the result back to the explosion-proof junction box 8 on the ground.

[0038] like Figure 2 and Figure 3As shown, the water injection pipe 6, cable casing 4, and exhaust pipe 5 of this embodiment are arranged in an array around the precious metal oxide anode 12. Specifically, the exhaust pipe 5, cable casing 4, and water injection pipe 6 are evenly arranged at 120 degrees around the precious metal oxide anode 12 in the center of the casing 14. This arrangement fully utilizes the internal space of the casing, facilitating the installation of various components, and also allows the carbon filler to be evenly filled around the anode, facilitating the flow of anode current.

[0039] In this embodiment, a well protection casing 9 is provided above the steel casing 14 , and gravel filler 10 is filled in the well protection casing 9 . The well protection casing 9 is provided above the well protection casing 9 , and the well head is composed of a concrete cover plate 1 and a concrete casing 2 , and the concrete casing 2 is surrounded by original soil 3 .

[0040] The specific installation process is:

[0041] (1) After the deep well is drilled and before the prefabricated anode body 11 is installed, the soil resistivity measuring device 16 connected to the soil resistivity measuring cable 17 is installed at the bottom of the well, and the soil resistivity measuring cable 17 is led to the wellhead and connected to the explosion-proof junction box 8;

[0042] (2) The soil resistivity meter 16 can automatically measure the soil resistivity at the bottom of the deep well anode bed and feed the result back to the explosion-proof junction box 8 through the soil resistivity measurement cable 17. After the deep well anode is installed, the staff can obtain the soil resistivity data under the deep well anode in the explosion-proof junction box. According to the measurement results, a small pump, a rubber water hose, etc. are used to inject water into the deep well anode bed through the water injection pipe 6 to increase the water content around the deep well anode bed, thereby reducing the soil resistivity around the deep well anode bed (especially significant in arid areas), effectively regulating and reducing the loop resistance, reducing the output voltage of the cathodic protection system, and improving the effectiveness of the output current.

[0043] In this embodiment, the prefabricated anode body 11 containing the exhaust pipe 5, the cable casing 4 and the water injection pipe 6 is prefabricated in the factory and assembled in the steel casing 14 together with the precious metal oxide anode 12 and the carbon filler 13 in the factory to reduce the difficulty and workload of on-site construction and facilitate on-site installation.

[0044] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely for the convenience of describing the present invention and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model depending on the specific circumstances.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A deep well anode bed for arid environments, comprising an explosion-proof junction box, a casing, and a prefabricated anode assembly and an exhaust pipe arranged in the casing, wherein the prefabricated anode assembly is electrically connected to the explosion-proof junction box through a cable, characterized in that: A water injection pipe is also arranged in the casing, and a soil resistivity measuring device is arranged at the bottom of the casing. The soil resistivity measuring device is electrically connected to the explosion-proof junction box through a cable.

2. The deep well anode bed for arid environment according to claim 1, characterized in that: The prefabricated anode assembly includes a prefabricated anode body, a precious metal oxide anode and a carbon filler. The prefabricated anode body is a cylindrical structure. The precious metal oxide anode is arranged on the central axis of the prefabricated anode body, and the carbon filler is filled between the prefabricated anode body and the precious metal oxide anode. The exhaust pipe and the water injection pipe are both placed in the carbon filler.

3. The deep well anode bed for arid environment according to claim 2, characterized in that: It also includes a cable sheath, which is placed in the carbon filler. An anode lead cable is arranged in the cable sheath. The prefabricated anode body and the noble metal oxide anode are electrically connected to the explosion-proof junction box through the anode lead cable.

4. The deep well anode bed for arid environment according to claim 3, characterized in that: The water injection pipe, the cable casing and the exhaust pipe are distributed in an array around the noble metal oxide anode.

5. The deep well anode bed for arid environment according to claim 3, characterized in that: A positioning frame is also provided in the prefabricated anode body. The positioning frame is arranged along the radial direction of the prefabricated anode body and is used to position the noble metal oxide anode.

6. The deep well anode bed for arid environment according to claim 1, characterized in that: A plurality of water injection pipe drainage holes are arranged on the side wall of the water injection pipe, and the hole diameter of the water injection pipe drainage holes is φ10mm~φ20mm.

7. The deep well anode bed for arid environment according to claim 1, characterized in that: The cable between the soil resistivity measuring device and the explosion-proof junction box is set as a soil resistivity measuring cable.

8. The deep well anode bed for arid environment according to any one of claims 1 to 7, characterized in that: The casing is a steel casing.

9. The deep well anode bed for arid environment according to claim 8, characterized in that: A well protection casing is arranged on the upper part of the steel casing, and gravel filler is filled in the well protection casing.

10. The deep well anode bed for arid environment according to claim 9, characterized in that: The wellhead is located above the well protection casing, and the wellhead is composed of a concrete cover plate and a concrete casing.

Images