A natural gas pipeline protection device based on natural gas power generation

Abstract

This utility model relates to the field of natural gas pipeline protection technology based on natural gas power generation, specifically a natural gas pipeline protection device based on natural gas power generation. It includes an outer protective shell, an electrostatic discharge component, and a support frame. The device uses circumferentially evenly distributed copper wire conductive brushes in continuous contact with the pipeline's outer wall. Combined with a low-resistance grounding plate, the electrostatic discharge resistance is ≤1Ω, and the electrostatic elimination efficiency reaches over 99%. The conductive brushes are made of soft copper wire, and the pre-compressed brush bristles design ensures stable contact pressure. Even with slight vibrations or radial displacement in the pipeline, the brush bristles remain in contact, avoiding the contact problems of traditional devices. There are no electrical components or fire sources of risk. All components are mechanically connected, adapting to the high explosion-proof requirements of natural gas pipelines and eliminating safety hazards caused by electrical faults.

Description

Technical Field

[0001] This utility model relates to the field of natural gas pipeline protection technology based on natural gas power generation, specifically a natural gas pipeline protection device based on natural gas power generation. Background Technology

[0002] As we all know, with the development of technology, using natural gas to replace some of the coal used for power generation can effectively improve energy efficiency and reduce environmental pollution. It has become the preferred technology for solving environmental pollution problems. In the process of using natural gas for power generation, pipelines are needed to transport natural gas. When transporting natural gas over long distances, the pipelines need to be spliced.

[0003] When natural gas flows at high speed in a pipeline, the friction between the airflow and the pipe wall generates static electricity. This is because trace impurities and moisture contained in natural gas come into contact with and separate from the metal pipe wall, causing charges to accumulate on the pipe wall surface. In dry environments or under high flow rate conditions, the accumulation of static electricity accelerates, which may break down the air and generate sparks. When the mixture of natural gas and air reaches the explosive limit, the sparks can directly cause an explosion, with extremely serious consequences.

[0004] Traditional natural gas pipeline protection devices focus only on physical protection and do not have a dedicated mechanical static electricity discharge structure. On the one hand, there are often gaps or insulating coatings between the protective shell and the pipeline, which prevents static electricity on the pipeline surface from being conducted through the protective shell. On the other hand, there is a lack of conductive components that are in continuous contact with the pipeline, so static electricity can only be discharged by the natural grounding of the pipeline itself. However, the sealing gaskets and corrosion oxide layers at the pipeline flange connections will increase the grounding resistance, which cannot meet the requirements for rapid static electricity discharge. Summary of the Invention

[0005] In order to overcome the problem that existing natural gas pipeline protection devices based on natural gas power generation do not have a static electricity discharge structure, this utility model provides a natural gas pipeline protection device based on natural gas power generation with static electricity discharge effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a natural gas pipeline protection device based on natural gas power generation, comprising:

[0007] The outer protective shell is a cylindrical structure with openings at both ends, made of conductive metal, and coaxially fitted on the outside of the natural gas pipeline, with an annular gap between it and the pipeline. The inner wall of the outer protective shell is smooth and parallel to the pipeline axis.

[0008] An electrostatic discharge assembly includes a conductive brush, an insulating support, and a grounding plate. The insulating support is uniformly fixed to the inner wall of an outer protective shell along its circumference, with its length aligned with the radial direction of the pipe. The conductive brush is fixed to the end of the insulating support away from the outer protective shell, with bristles arranged radially along the pipe and in close contact with the outer wall of the pipe. The contact points are uniformly distributed along the circumference of the pipe. One end of the grounding plate is fixedly connected to the outer wall of the outer protective shell, and the other end extends to the ground and is fixed to the grounding structure. The length of the grounding plate is inclined to the axis of the pipe.

[0009] The support frame includes an arc-shaped support plate and a column. The inner wall of the arc-shaped support plate is fitted with the outer wall of the outer protective shell, and the curvature of the fitting surface is consistent with the curvature of the outer wall of the outer protective shell. The two ends of the support plate are connected by bolts to form a closed ring, which wraps around the outer protective shell. One end of the column is fixed vertically to the bottom of the arc-shaped support plate, and the other end is fixed to the ground foundation. The axis of the column is perpendicular to the ground.

[0010] Preferably, the outer protective shell is composed of a single-layer metal cylinder with uniform wall thickness and rust-proof surface treatment. The edges at both ends are rounded to avoid discharge phenomena caused by sharp structures. The inner diameter of the outer protective shell is larger than the outer diameter of the pipe, and the annular gap width is uniform and consistent along the pipe axis.

[0011] Furthermore, the conductive brush of the electrostatic discharge component is a copper wire brush, and the brush bristles are made of multiple strands of soft copper wire twisted together. The length of the brush bristles in the free state is greater than the distance from the end of the insulating support to the outer wall of the pipe, ensuring that the contact pressure with the outer wall of the pipe is not less than 3N. The brush base is fixed to the insulating support by bolts, and the axis of the brush base coincides with the axis of the insulating support.

[0012] Furthermore, the insulating bracket is made of polytetrafluoroethylene and has a rod-shaped structure. One end is fixed to the inner wall of the outer protective shell by welding, and the other end is opened with a threaded hole to connect to the conductive brush seat. One bracket is set every 50° along the circumference of the outer protective shell, for a total of 7 brackets. The length direction of the bracket is consistent with the radial direction of the outer protective shell.

[0013] In a further embodiment, the grounding plate is a flat copper strip, one end of which is fixed to the outer wall of the outer protective shell by a bolt, with the bolt axis aligned with the radial direction of the outer protective shell, and the other end is fixed to the ground by a grounding nail, which is a copper cylinder with its axis perpendicular to the ground and buried underground.

[0014] Based on the aforementioned scheme, the arc-shaped support plate of the support frame is made of steel plate bent into shape, with conductive rubber pads pasted on the inner wall. The pad surface is in close contact with the outer wall of the outer protective shell, and the surface is provided with anti-slip texture. The texture direction is perpendicular to the pipeline axis. The connecting bolts at both ends of the support plate are arranged radially, and the bolt heads are provided with anti-loosening nuts.

[0015] Further, based on the aforementioned scheme, the column is a metal square tube, the top of which is fixed to the bottom of the arc-shaped support plate by welding, the welding surface is perpendicular to the bottom surface of the support plate, the bottom of the column is provided with a flange, the flange is connected to the ground foundation by expansion bolts, and the plane of the flange is perpendicular to the axis of the column.

[0016] Furthermore, based on the aforementioned scheme, the outer wall of the outer protective shell is uniformly marked with graduations along the axial direction, the graduation lines being parallel to the pipeline axis, and annular lifting lugs are welded circumferentially to the side of the outer protective shell, with the axis of the lifting lugs being parallel to the pipeline axis, for use in hoisting the device.

[0017] Beneficial effects

[0018] This natural gas pipeline protection device, based on natural gas power generation, uses circumferentially distributed copper wire conductive brushes in continuous contact with the outer wall of the pipeline. Combined with a low-resistance grounding plate, it forms a complete conductive path: "pipeline - conductive brush - outer protective shell - grounding plate - earth." The electrostatic discharge resistance is ≤1Ω, and the electrostatic elimination efficiency exceeds 99%. It can reduce the electrostatic voltage on the pipeline surface to a safe value (<50V) within one second. The conductive brushes are made of soft copper wire, and the pre-compressed bristles ensure stable contact pressure. Even with slight vibrations or radial displacement of the pipeline, the bristles remain in contact, avoiding the contact problems of traditional devices. There are no electrical components or fire sources. All components are mechanically connected, adapting to the high explosion-proof requirements of natural gas pipelines and eliminating safety hazards caused by electrical faults. The arc-shaped support plate of the mounting bracket can be adjusted with bolts to accommodate pipes of different diameters. The flange connection between the column and the ground adapts to uneven ground, ensuring stable installation without restricting the normal thermal expansion and contraction of the pipeline. Easily damaged parts such as the conductive brushes and grounding plates can be disassembled and replaced individually without dismantling the entire device. Attached Figure Description

[0019] Figure 1 This is a side view of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the pallet of this utility model;

[0021] Figure 3 This is a schematic diagram of the electrostatic discharge component of this utility model;

[0022] Figure 4 This is a schematic diagram of the scale structure of this utility model;

[0023] Figure 5 This is a structural schematic diagram of the support and fixing frame of this utility model.

[0024] In the diagram: 1. Outer protective shell; 2. Static discharge assembly; 3. Conductive brush; 4. Bracket; 5. Grounding plate; 6. Support frame; 7. Tray; 8. Column; 9. Brush holder; 10. Grounding nail; 11. Rubber pad; 12. Anti-slip texture; 13. Anti-loosening nut; 14. Flange; 15. Expansion bolt; 16. Scale; 17. Lifting lug. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] See Figures 1-5 A natural gas pipeline protection device based on natural gas power generation achieves safety protection and elimination of static electricity hazards in natural gas pipelines through a triple collaborative design of "physical protection + static electricity discharge + stable support". The core solution is as follows: the outer protective shell 1 is coaxially sleeved on the outside of the pipeline, forming a physical barrier and serving as a conductive carrier. The static electricity discharge component 2 continuously contacts the outer wall of the pipeline through circumferentially evenly distributed conductive brushes 3, conducting static electricity to the ground through the outer protective shell 1 and grounding plate 5. The support and fixing frame 6 stably fixes the device to the ground through the arc-shaped bracket 7 and the column 8, ensuring long-term reliable operation. The components are precisely matched through welding, bolt connection, and tight fitting, solving the problem of traditional pipeline protection devices lacking a dedicated static electricity discharge structure and the safety risks caused by static electricity accumulation. It is suitable for explosion-proof protection scenarios of natural gas power plants and long-distance pipelines.

[0027] First, refer to Figure 1 In this embodiment, the outer protective shell 1 is a cylindrical structure with openings at both ends. It is made of conductive metal (Q235 steel plate rolled and welded). The surface is sandblasted to remove rust and then coated with anti-rust paint (salt spray resistance ≥500 hours). There are no sharp protrusions. The edges at both ends are ground to form rounded corners (to avoid sharp discharge phenomenon). The outer protective shell 1 is coaxially sleeved on the outside of the natural gas pipeline, with an annular gap between it and the pipeline. The gap width is uniform along the axial direction. The inner wall is ground to ensure that it is parallel to the pipeline axis and that there are no local protrusions that interfere with the thermal expansion and contraction of the pipeline.

[0028] The outer protective shell 1 serves as the core load-bearing and conductive component of the device, and has a dual function: on the one hand, its cylindrical structure covers the outer wall of the pipe, which can block external mechanical impacts (such as stone impacts and construction collisions) and environmental corrosion (rainwater and moisture), protecting the pipe body from damage. On the other hand, as a conductive carrier, it conducts the static electricity collected by the static discharge component 2 to the grounding system, realizing the safe release of static electricity. Its inner diameter is larger than the outer diameter of the pipe, and the reserved annular gap avoids direct rigid contact with the pipe (preventing pipe vibration and wear) and provides space for the installation of the conductive brush 3.

[0029] Then, refer to Figure 3 In this embodiment, the static discharge component 2 is the core component for eliminating static electricity accumulation in the pipeline. It safely discharges static electricity through a "contact collection-conduction release" path. The conductive brush 3 is a copper wire brush with bristles made of multiple strands of soft copper wire twisted together (good flexibility and not easy to break). The brush holder 9 is made of brass (excellent conductivity) and is fixed to the end of the insulating bracket 4 by bolts. The insulating bracket 4 is made of polytetrafluoroethylene (excellent insulation performance) and has a rod-shaped structure. One end is fixed to the inner wall of the outer protective shell 1 by welding (the welding points are evenly distributed along the circumference), and the other end has a threaded hole and is bolted to the brush holder 9. The length direction of the bracket 4 is consistent with the radial direction of the outer protective shell 1, ensuring that the bristles of the conductive brush 3 are set along the radial direction of the pipeline.

[0030] In its free state, the length of the conductive brush 3 bristles is slightly greater than the distance from the end of the insulating bracket 4 to the outer wall of the pipe. After installation, the bristles are compressed and undergo elastic deformation, forming a stable contact with the outer wall of the pipe (with uniform contact pressure). Even if there is a slight radial vibration or displacement in the pipe, the bristles can still maintain contact through deformation, avoiding interruption of electrostatic conduction caused by poor contact.

[0031] The grounding piece 5 is a flat copper strip (purity ≥99.9%, good conductivity). One end is fixed to the outer wall of the outer protective shell 1 by a bolt (the bolt axis is consistent with the radial direction of the outer protective shell 1, and an anti-loosening washer is added to the bolt head). The other end extends to the ground along the inclined direction and is connected to the earth through a copper grounding nail 10. The grounding nail 10 is a cylindrical structure with a tin-plated surface for rust prevention. It is buried vertically in the ground (burial depth ≥500mm) and in close contact with the soil to form a low-resistance grounding circuit.

[0032] The inclined setting of the grounding plate 5 allows it to naturally conform to the ground slope, avoiding tearing caused by uneven ground. The flat structure increases the contact area with air, accelerates the static electricity conduction process, and ensures that the resistance of the static electricity conduction path from the pipe to the ground is extremely small, achieving rapid release.

[0033] Secondly, see Figure 5In this embodiment, the support frame 6 is used to stably fix the outer protective shell 1 and the entire device to the ground to prevent external forces from causing the device to shift or shake. The arc-shaped support plate 7 is made of Q235 steel plate and the inner wall curvature is perfectly matched with the outer wall curvature of the outer protective shell 1. The contact surface is attached with a conductive rubber pad 11. The surface of the rubber pad 11 is provided with transverse anti-slip texture 12 (the texture direction is perpendicular to the pipe axis). The support plate 7 is divided into two symmetrical halves, and flange ear plates are welded at both ends. Bolt holes are opened on the ear plates and a closed ring is formed by high-strength bolts to wrap the outer wall of the outer protective shell 1. Anti-loosening nuts 13 are installed on the bolt heads (to prevent vibration from loosening).

[0034] The closed structure of the arc-shaped support plate 7 can adjust the clamping force by tightening the bolts to adapt to the outer protective shell 1 with different outer diameters. The conductive rubber pad 11 enhances the tightness of the fit between the support plate 7 and the outer protective shell 1 (preventing relative slippage) and uses the elastic deformation of the rubber to compensate for the slight roundness error of the outer protective shell 1, ensuring uniform force. The anti-slip texture 12 further increases the friction and prevents the device from axial displacement when the pipeline vibrates.

[0035] The column 8 is a metal square tube, and its top is fixed to the bottom of the arc-shaped support plate 7 by welding. The welding surface is perpendicular to the bottom surface of the support plate 7 (to ensure that the column 8 is subjected to vertical downward force) without any skewing. The bottom of the column 8 is welded with a flange 14 (cut from a steel plate). The flange 14 is connected to the ground foundation (concrete pouring) by expansion bolts 15. The plane of the flange 14 is perpendicular to the axis of the column 8 to ensure that the column 8 is perpendicular to the ground and has stable load-bearing capacity.

[0036] The square tube structure of column 8 has strong resistance to lateral bending and can effectively resist lateral wind or external impact, preventing the device from tilting. The multi-point bolt connection between flange 14 and the ground further enhances the overall stability and ensures that the coaxiality of the outer protective shell 1 and the pipeline is not affected by ground settlement.

[0037] See again Figure 4 In this embodiment, the outer wall of the outer protective shell 1 is uniformly sprayed with marking scale 16 (white paint, clear and wear-resistant) along the axial direction. The scale 16 line is parallel to the pipeline axis and is used to visually observe the installation position of the device and the displacement of the pipeline due to thermal expansion and contraction. Two annular lifting lugs 17 (forged steel plate) are symmetrically welded to the side of the outer protective shell 1 along the circumference. The axis of the lifting lugs 17 is parallel to the pipeline axis and is used for hoisting and installing the device (to avoid damage to the parts by manual handling).

[0038] The welding points between the outer protective shell 1 and the insulating support 4 are polished smooth (without weld slag protrusions) to prevent local electric field concentration. The ends of the bristles of the conductive brush 3 are passivated (without sharp broken ends) to avoid scratching the anti-corrosion coating on the outer wall of the pipe. The connecting bolts between the grounding plate 5 and the outer protective shell 1 are made of copper (to avoid corrosion from dissimilar metals). Flat washers and spring washers are installed between the bolts and the outer protective shell 1 to ensure good electrical contact.

[0039] In addition, see Figure 1 In this embodiment, the static electricity generated by the high-speed flow of natural gas in the pipeline accumulates on the surface of the pipe wall. The conductive brush 3 is in close contact with the outer wall of the pipeline through a soft copper wire, collecting the static electricity and conducting it to the outer protective shell 1 fixed by the insulating support 4. The outer protective shell 1 acts as a conductive carrier, transferring the static electricity through the grounding plate 5 to the grounding nail 10, and finally conducting it to the ground, forming a complete conductive path of "pipeline → conductive brush 3 → outer protective shell 1 → grounding plate 5 → grounding nail 10 → ground", with no insulation breaks throughout the process, ensuring that static electricity does not accumulate.

[0040] The outer protective shell 1 covers the outer wall of the pipe, blocking external mechanical impact and environmental corrosion. The arc-shaped support plate 7 of the support bracket 6 is tightly attached to the outer protective shell 1 through the conductive rubber pad 11, which not only fixes the position of the device, but also does not affect the conductivity of the outer protective shell 1. The column 8 and flange 14 transfer the weight of the device to the ground foundation, avoiding the deformation of the pipe caused by the outer protective shell 1 pressing directly on the pipe.

[0041] The closed ring structure of the arc-shaped support plate 7 fits the outer protective shell 1. The anti-slip texture 12 and the elastic deformation of the rubber pad 11 together prevent the device from sliding axially. The vertical support of the column 8 and the multi-point fixation of the flange 14 ensure that the device does not tilt under the action of external forces such as vibration and wind. The outer protective shell 1 and the pipeline always remain coaxial. The contact pressure between the conductive brush 3 and the pipeline is stable (no risk of poor contact).

[0042] In addition, see Figure 1 In this embodiment, the gas pipeline of the natural gas power plant is protected. The natural gas in the pipeline has a high flow rate and contains trace impurities and moisture, which can easily generate static electricity. The pipeline is located outdoors and needs to be protected against wind and rain corrosion and mechanical collisions. The static voltage needs to be controlled below 50V to avoid causing an explosion.

[0043] The outer protective shell 1 is made of Q235 steel plate, with a diameter slightly larger than the outer diameter of the pipe. The annular gap is uniform, and the two ends are rounded. The surface is sprayed with weather-resistant and rust-proof paint to adapt to the outdoor environment. The static discharge component 2 consists of 7 insulating brackets 4 that are uniformly welded around the outer protective shell 1. Each bracket 4 has a copper wire conductive brush 3 fixed to its end by bolts. The brush filaments are in close contact with the outer wall of the pipe. The grounding plate 5 is made of 2mm thick flat copper strip. One end is fixed to the outer protective shell 1 by bolts, and the other end is connected to a copper grounding nail 10 (buried at a depth of 600mm).

[0044] A 5mm thick conductive rubber pad 11 is pasted on the inner wall of the arc-shaped support plate 7 and fixed by bolts. The column 8 is made of square tube and the bottom flange 14 is fixed to the concrete foundation by expansion bolts 15. After installation, the resistance of the entire conductive path is measured by a grounding resistance tester and is 0.8Ω, which meets the safety standard. When the pipeline is running, the electrostatic voltmeter monitors and shows that the electrostatic voltage of the pipe wall is stable below 30V, with no risk of spark discharge.

[0045] Inspection after heavy rain outdoors: There is no rust on the surface of the outer protective shell 1, the grounding plate 5 is not loose and the connecting bolts of the outer protective shell 1 are not loose, the grounding resistance is still 0.8Ω, the static discharge function is normal, the filaments of the conductive brush 3 are slightly worn but still in contact with the pipe, the outer protective shell 1 has no mechanical damage, the support bracket 6 is not tilted, and the arc-shaped support plate 7 fits tightly with the outer protective shell 1 without relative sliding.

[0046] When the pipeline vibrates slightly due to airflow fluctuations, the soft copper wire of the conductive brush 3 maintains contact through elastic deformation. The electrostatic voltage fluctuation is ≤5V, and there is no interruption of contact. The stability of the device meets the safety requirements of the power plant.

[0047] Finally, see Figure 1 In this embodiment, the outer protective shell 1 is made of 316L stainless steel, which greatly improves corrosion resistance (salt spray resistance ≥1000 hours), making it suitable for natural gas pipelines in coastal or high-humidity areas (such as coastal power plants). The brush bristles of the conductive brush 3 are made of silver-plated copper wire, which further enhances conductivity and improves oxidation resistance, making it suitable for long-term operation (maintenance cycle extended to 1 year).

[0048] Working principle:

[0049] When using this natural gas pipeline protection device based on natural gas power generation, the outer protective shell 1 is first hoisted to the pipeline section to be protected by a crane using the annular lifting lug 17 of the outer protective shell 1. The position is adjusted so that the outer protective shell 1 is coaxial with the pipeline and the annular gap is uniform. The static discharge component 2 is then installed: the insulating bracket 4 is welded to the inner wall of the outer protective shell 1 (evenly distributed in the circumference), and the conductive brush 3 is fixed by bolts to ensure that the brush bristles are in close contact with the outer wall of the pipeline (the brush bristles are slightly bent). One end of the grounding plate 5 is fixed to the outer wall of the outer protective shell 1 with bolts, and the other end is connected to the grounding nail 10. The grounding nail 10 is vertically buried in the ground and compacted.

[0050] Place the two halves of the arc-shaped support plate 7 onto the outer wall of the outer protective shell 1 and tighten them with bolts (with moderate clamping force to avoid damaging the outer protective shell 1). Ensure that the conductive rubber pad 11 is tightly attached. Weld the top of the column 8 to the bottom of the support plate 7. Fix the bottom flange 14 to the ground foundation with expansion bolts 15. Adjust the verticality of the column 8 (by calibrating with a level).

[0051] Natural gas flows at high speed inside the pipeline, generating static electricity through friction with the pipe wall. The charge accumulates on the pipe wall surface, forming an electrostatic voltage. The soft copper wire of the conductive brush 3 is in continuous contact with the outer wall of the pipeline, conducting the static charge on the pipe wall to the brush holder 9, and then through the insulating support 4 to the outer protective shell 1 (conductive metal material). The static electricity of the outer protective shell 1 is conducted to the grounding nail 10 through the grounding plate 5 (conductive copper strip). The grounding nail 10 contacts the soil, safely conducting the static electricity to the ground, so that the electrostatic voltage on the pipeline surface is always kept within a safe range (no risk of spark discharge).

[0052] Regularly check the wear of conductive brush 3: if the brush bristles are not long enough (unable to contact the pipe), loosen the bolts on the insulating bracket 4 and replace the conductive brush 3 with a new one to ensure stable contact pressure. Check the grounding system: measure the grounding resistance (ensure it is ≤1Ω). If the resistance is too high, check whether the connecting bolts of the grounding plate 5 are loose and whether the grounding nail 10 is corroded. If necessary, replace the grounding nail 10 or add a grounding electrode. Check whether the surface anti-rust paint has peeled off or whether there is mechanical damage. Repaint or repair in time to avoid corrosion affecting conductivity.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A natural gas pipeline protection device based on natural gas power generation, characterized in that, include: The outer protective shell (1) is a cylindrical structure with open ends, made of conductive metal, and coaxially sleeved on the outside of the natural gas pipeline, with an annular gap between it and the pipeline. The inner wall of the outer protective shell (1) is smooth and parallel to the pipeline axis. An electrostatic discharge assembly (2) includes a conductive brush (3), an insulating support (4), and a grounding plate (5). The insulating support (4) is uniformly fixed to the inner wall of the outer protective shell (1) along its circumference. The length direction of the support (4) is consistent with the radial direction of the pipe. The conductive brush (3) is fixed to one end of the insulating support (4) away from the outer protective shell (1). The brush bristles are arranged along the radial direction of the pipe and are in close contact with the outer wall of the pipe. The contact points are evenly distributed along the circumference of the pipe. One end of the grounding plate (5) is fixedly connected to the outer wall of the outer protective shell (1), and the other end extends to the ground and is fixed to the grounding structure. The length direction of the grounding plate (5) is inclined to the axis of the pipe. The support frame (6) includes an arc-shaped support plate (7) and a column (8). The inner wall of the arc-shaped support plate (7) is attached to the outer wall of the outer protective shell (1), and the curvature of the contact surface is consistent with the curvature of the outer wall of the outer protective shell (1). The two ends of the support plate (7) are connected by bolts to form a closed ring to wrap the outer protective shell (1). One end of the column (8) is fixed vertically to the bottom of the arc-shaped support plate (7), and the other end is fixed to the ground foundation. The axis of the column (8) is perpendicular to the ground.

2. The natural gas pipeline protection device based on natural gas power generation according to claim 1, characterized in that, The outer protective shell (1) is composed of a single-layer metal cylinder with uniform wall thickness and rust prevention treatment on the surface. The edges at both ends are rounded to avoid the discharge phenomenon caused by sharp structures. The inner diameter of the outer protective shell (1) is larger than the outer diameter of the pipe, and the width of the annular gap is uniform and consistent along the axial direction of the pipe.

3. A natural gas pipeline protection device based on natural gas power generation according to claim 2, characterized in that, The conductive brush (3) of the electrostatic discharge component (2) is a copper wire brush. The brush bristles are made of multiple strands of soft copper wire twisted together. The length of the brush bristles in the free state is greater than the distance from the end of the insulating bracket (4) to the outer wall of the pipe, ensuring that the contact pressure with the outer wall of the pipe is not less than 3N. The brush seat (9) and the insulating bracket (4) are fixed by bolts, and the axis of the brush seat (9) coincides with the axis of the insulating bracket (4).

4. A natural gas pipeline protection device based on natural gas power generation according to claim 3, characterized in that, The insulating bracket (4) is made of polytetrafluoroethylene and has a rod-shaped structure. One end is fixed to the inner wall of the outer protective shell (1) by welding, and the other end is opened with a threaded hole to connect to the brush seat (9) of the conductive brush (3). The bracket (4) is set every 50° along the circumference of the outer protective shell (1), for a total of 7 brackets. The length direction of the bracket (4) is consistent with the radial direction of the outer protective shell (1).

5. A natural gas pipeline protection device based on natural gas power generation according to claim 4, characterized in that, The grounding piece (5) is a flat copper strip. One end is fixed to the outer wall of the outer protective shell (1) by a bolt. The bolt axis is radially aligned with the outer protective shell (1). The other end is fixed to the ground by a grounding nail (10). The grounding nail (10) is a copper cylinder with its axis perpendicular to the ground and buried underground.

6. A natural gas pipeline protection device based on natural gas power generation according to claim 5, characterized in that, The arc-shaped support plate (7) of the support frame (6) is made of steel plate bent into shape. The inner wall is pasted with conductive rubber pad (11). The pad surface of the rubber pad (11) is closely attached to the outer wall of the outer protective shell (1). The surface is provided with anti-slip texture (12). The direction of the anti-slip texture (12) is perpendicular to the pipeline axis. The connecting bolts at both ends of the support plate (7) are arranged radially, and the bolt heads are provided with anti-loosening nuts (13).

7. A natural gas pipeline protection device based on natural gas power generation according to claim 6, characterized in that, The column (8) is a metal square tube, and its top is fixed to the bottom of the arc-shaped support plate (7) by welding. The welding surface is perpendicular to the bottom surface of the support plate (7). The bottom of the column (8) is provided with a flange (14). The flange (14) is connected to the ground foundation by expansion bolts (15). The plane of the flange (14) is perpendicular to the axis of the column (8).

8. A natural gas pipeline protection device based on natural gas power generation according to claim 7, characterized in that, The outer protective shell (1) has marking scales (16) evenly arranged along the axial direction on its outer wall. The scales (16) are parallel to the pipeline axis. The outer protective shell (1) has annular lifting lugs (17) welded circumferentially on its side. The axis of the lifting lugs (17) is parallel to the pipeline axis and is used for hoisting the device.

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