Pipeline corrosion inhibitor injection device

Abstract

The present invention relates to the technical field of corrosion inhibitor injection equipment, and in particular to a pipeline corrosion inhibitor injection device, comprising a nitrogen delivery unit, a corrosion inhibitor delivery unit and an injection unit, wherein the output end of the nitrogen delivery unit is connected to the input end of the injection unit, and the output end of the corrosion inhibitor delivery unit is connected to the input end of the injection unit; the injection unit comprises an atomizing nozzle, an atomizing fluid delivery pipeline and a swirl generating component, the swirl generating component comprises a delivery pipeline, an outer shell and an inner shell arranged in the outer shell, the swirl generating component is used to make the passing fluid form a spiral flow into the delivery pipeline, utilize fluid atomization technology to atomize the liquid corrosion inhibitor into droplets of small molecular size for easy dispersion in the gas phase medium, and at the same time utilize the spiral flow generated by the swirl generating component to make the corrosion inhibitor droplets in the gas phase medium perform spiral motion along the inner wall of the pipeline in the form of an annular liquid film, promote the adsorption and film formation of the corrosion inhibitor on the pipe wall, and improve the corrosion inhibition efficiency of the corrosion inhibitor.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion inhibitor injection equipment, in particular to a pipeline corrosion inhibitor injection device. Background Art

[0002] In 1859, American Robert Drake drilled the first modern oil well, the Drake Well, in Pennsylvania, marking the beginning of the modern petroleum industry. With the advent of the modern petroleum industry, the use of oil and gas pipelines has continued to grow and become a dominant method of transporting oil and gas, primarily made of metal. Corrosion is a significant and unavoidable problem in pipeline transportation, with an estimated annual corrosion cost in my country of $10 billion. This not only wastes national resources but also leads to oil and gas leaks, resulting in fires and explosions, posing a direct threat to human life. Corrosion inhibitors have become a key method for inhibiting corrosion within natural gas pipelines, and effective injection of corrosion inhibitors into pipelines is crucial to their effectiveness. However, in the oil and gas industry, efficient and cost-effective methods for injecting corrosion inhibitors into natural gas pipelines are currently lacking. Inadequate inhibitor dispersion and uneven film formation are common problems, making it difficult to form a complete and effective protective film on the pipeline. The traditional pig corrosion inhibitor injection system has a complex structure, a long corrosion inhibitor injection time, and high operating costs. It is also not suitable for small-diameter natural gas gathering pipelines or pipelines within gas gathering and transmission stations that cannot send and receive pigs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the problems in the prior art that the corrosion inhibitor injection time is long, the operating cost is high, and it is not suitable for small-diameter natural gas gathering pipelines or pipelines within gas gathering and transmission stations that cannot send and receive pigs, a pipeline corrosion inhibitor injection device is provided.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a pipeline corrosion inhibitor injection device, comprising a nitrogen delivery unit, a corrosion inhibitor delivery unit and an injection unit, wherein the output end of the nitrogen delivery unit is connected to the input end of the injection unit, and the output end of the corrosion inhibitor delivery unit is connected to the input end of the injection unit;

[0005] The injection unit includes an atomizing nozzle, an atomizing fluid delivery pipeline and a swirl generating assembly. One input end of the atomizing nozzle is connected to the output end of the nitrogen delivery unit, the other input end of the atomizing nozzle is connected to the output end of the corrosion inhibitor delivery unit, the output end of the atomizing nozzle is connected to the input end of the atomizing fluid delivery pipeline, and the output end of the atomizing fluid delivery pipeline is connected to the input end of the swirl generating assembly.

[0006] The swirl generating component includes a conveying pipe, an outer shell and an inner shell arranged in the outer shell. The swirl generating component is used to make the passing fluid form a spiral flow and enter the conveying pipe. The inner shell surrounds the conveying pipe. An input port is provided on one end of the outer shell. An outer layer flow channel is formed between the outer shell and the inner shell. The input port and the outer layer flow channel are connected. An inner layer flow channel is formed between the inner shell and the conveying pipe. The outer layer flow channel and the inner layer flow channel are connected by a connecting port channel. An output port is provided on the conveying pipe. The output port and the inner layer flow channel are connected. A number of guide blades are arranged on the wall of the inner shell close to the conveying pipe. Fluid atomization technology is used to atomize the liquid corrosion inhibitor into droplets of small molecular size for easy dispersion in the gas phase medium. At the same time, the spiral flow generated by the swirl generating component is used to make the corrosion inhibitor droplets in the gas phase medium spirally move along the inner wall of the pipe in the form of an annular liquid film, thereby promoting the adsorption and film formation of the corrosion inhibitor on the pipe wall, improving the corrosion inhibition efficiency of the corrosion inhibitor, and reducing the amount of corrosion inhibitor used.

[0007] In order to solve the problem of how to arrange the nitrogen delivery unit, the nitrogen delivery unit further includes a nitrogen source, a first control valve and a gas booster pump. The output end of the nitrogen source is connected to the input end of the gas booster pump through the first control valve, and the output end of the gas booster pump is connected to the input end of the atomizing nozzle.

[0008] In order to solve the problem of how to arrange the corrosion inhibitor delivery unit, the corrosion inhibitor delivery unit further includes a corrosion inhibitor liquid storage tank, a second control valve and a peristaltic pump. The output end of the corrosion inhibitor liquid storage tank is connected to the input end of the peristaltic pump through the second control valve, and the output end of the peristaltic pump is connected to the input end of the atomizing nozzle.

[0009] It further includes that the connection between the injection unit and the conveying pipeline is the outer peripheral wall of the conveying pipeline.

[0010] In order to solve the problem of insufficient flow path of the corrosion inhibitor, the input port and the output port are further arranged on the same side, and the input port and the connecting port are arranged on opposite sides.

[0011] It further includes flanges installed at both ends of the transmission pipeline for connecting to natural gas pipelines.

[0012] It further includes a spiral structure of the guide blade.

[0013] It further includes an inner diameter of the inner shell being D1, an outer diameter of the conveying pipe being D2, a length of the guide vane being L=4D1, a width of the guide vane being a=0.02D1, a height of the guide vane being h=0.2D1, D1=D2+h, an angle α=40° between a tangent line at a trailing edge of the guide vane and an extension line of a leading edge of the guide vane, the number of guide vanes being N=4, a fixed bisecting angle β of the guide vane being 90°, and the guide vanes being arranged on the wall of the inner shell at equal intervals of πD1 / 4.

[0014] The beneficial effects of the present invention are as follows: the pipeline corrosion inhibitor injection device provided by the present invention utilizes fluid atomization technology to atomize the liquid corrosion inhibitor into droplets of small molecular size for easy dispersion in the gas phase medium, and simultaneously utilizes the spiral flow generated by the swirl generating component to cause the corrosion inhibitor droplets in the gas phase medium to perform spiral motion along the inner wall of the pipeline in the form of an annular liquid film, thereby promoting the adsorption and film formation of the corrosion inhibitor on the pipe wall, improving the corrosion inhibition efficiency of the corrosion inhibitor, and reducing the amount of corrosion inhibitor used;

[0015] Compared with the traditional pig corrosion inhibitor injection system, this corrosion inhibitor injection device has a simple structure, a simple injection process, and low operating costs, thus providing a simple and efficient corrosion inhibitor injection method and device for the prevention and control of corrosion in natural gas transmission pipelines in the oil and gas industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the swirl generating assembly of the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner shell of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the present invention.

[0023] Figure: 1. Nitrogen delivery unit, 11. Nitrogen source, 12. First control valve, 13. Gas booster pump

[0024] 2. Corrosion inhibitor delivery unit, 21. Corrosion inhibitor storage tank, 22. Second control valve, 23. Peristaltic pump,

[0025] 3. Injection unit, 31. Atomizing nozzle, 32. Atomized fluid delivery pipeline, 33. Swirl generation component, 331. Delivery pipeline, 3311. Output port, 332. Outer shell, 3321. Input port, 333. Inner shell, 334. Outer flow channel, 335. Inner flow channel, 336. Connecting port, 337. Guide vane, 338. Flange. DETAILED DESCRIPTION

[0026] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0027] like Figure 1 This is a structural diagram of the present invention, a pipeline corrosion inhibitor injection device, including a nitrogen delivery unit 1, a corrosion inhibitor delivery unit 2 and an injection unit 3,

[0028] like Figure 1 As shown, the output end of the nitrogen delivery unit 1 is connected to the input end of the injection unit 3, and the nitrogen delivery unit 1 includes a nitrogen source 11, a first control valve 12 and a gas booster pump 13. The output end of the nitrogen source 11 is connected to the input end of the gas booster pump 13 through the first control valve 12, and the output end of the gas booster pump 13 is connected to the input end of the atomizing nozzle 31.

[0029] like Figure 1 As shown, the output end of the corrosion inhibitor delivery unit 2 is connected to the input end of the injection unit 3. The corrosion inhibitor delivery unit 2 includes a corrosion inhibitor storage tank 21, a second control valve 22 and a peristaltic pump 23. The output end of the corrosion inhibitor storage tank 21 is connected to the input end of the peristaltic pump 23 through the second control valve 22, and the output end of the peristaltic pump 23 is connected to the input end of the atomizing nozzle 31.

[0030] like Figure 1 、 Figure 2 As shown, the injection unit 3 includes an atomizing nozzle 31, an atomizing fluid delivery pipeline 32 and a swirl generating component 33. A stop valve is installed on the atomizing fluid delivery pipeline 32. The stop valve is located between the atomizing nozzle 31 and the swirl generating component 33. The atomizing nozzle 31 is a two-fluid atomizing nozzle. One input end of the atomizing nozzle 31 is connected to the output end of the nitrogen delivery unit 1, and the other input end of the atomizing nozzle 31 is connected to the output end of the corrosion inhibitor delivery unit 2. The output end of the atomizing nozzle 31 is connected to the atomizing fluid delivery pipeline 3 2, the output end of the atomized fluid delivery pipeline 32 is connected to the input end of the swirl generating component 33, and the fluid atomization technology is used to atomize the liquid corrosion inhibitor into small molecular size droplets for easy dispersion in the gas phase medium. At the same time, the spiral flow generated by the swirl generating component 33 is used to make the corrosion inhibitor droplets in the gas phase medium perform spiral motion in the form of an annular liquid film along the inner wall of the pipeline, thereby promoting the adsorption and film formation of the corrosion inhibitor on the wall of the delivery pipeline 331 and the natural gas pipeline, improving the corrosion inhibition efficiency of the corrosion inhibitor, and reducing the amount of corrosion inhibitor used.

[0031] The swirl generating assembly 33 includes a conveying pipe 331, an outer shell 332, and an inner shell 333 arranged in the outer shell 332. The swirl generating assembly 33 is used to form a spiral flow for the passing fluid to enter the conveying pipe 331 and to be able to spirally flow along the axial direction of the conveying pipe 331. The inner shell 333 surrounds the conveying pipe 331. An input port 3321 is provided at one end of the outer shell 332. An outer layer flow channel 334 is formed between the outer shell 332 and the inner shell 333. The input port 3321 is connected to the outer layer flow channel 334. An inner layer flow channel 335 is formed between the inner shell 333 and the conveying pipe 331. A connection port 336 is passed between the outer layer flow channel 334 and the inner layer flow channel 335. An output port 3311 is provided on the conveying pipe 331. The output port 3311 is connected to the inner layer flow channel 335. A plurality of guide vanes 337 are arranged on the wall of the inner shell 333 close to the conveying pipe 331.

[0032] like Figure 2 As shown, the connection between the injection unit 3 and the delivery pipe 331 is the outer peripheral wall of the delivery pipe 331.

[0033] like Figure 2 As shown, the input port 3321 is located on the side wall of the outer shell 332, the input port 3321 is located on the side wall of the delivery pipe 331, the input port 3321 and the output port 3311 are arranged on the same side, and the input port 3321 and the connecting port 336 are arranged on opposite sides. Through the design of the guide blade 337, the flow direction of the atomized corrosion inhibitor entering the delivery pipe 331 is the axial spiral flow direction.

[0034] Flanges 338 for connecting to natural gas pipelines are installed at both ends of the delivery pipeline 331 to facilitate the connection of the corrosion inhibitor injection device to the natural gas pipeline.

[0035] like Figure 3 、 Figure 4 、 Figure 5 As shown, the guide vane 337 has a spiral structure, the inner diameter of the inner casing 333 is D1, the outer diameter of the conveying pipe 331 is D2, the length of the guide vane 337 is L=4D1, the width of the guide vane 337 is a=0.02D1, the height of the guide vane 337 is h=0.2D1, D1=D2+h, the angle α between the tangent line at the trailing edge of the guide vane 337 and the extension line of the leading edge of the guide vane is 40°, the number of blades of the guide vane 337 is N=4, the fixed bisecting angle β of the guide vane 337 is 90°, and the guide vanes 337 are arranged on the wall of the inner casing 333 at equal intervals of πD1 / 4.

[0036] like Figure 6As shown, the atomized corrosion inhibitor fluid rotates circumferentially in the cross section of the delivery pipeline 331 or natural gas pipeline where the corrosion inhibitor needs to be injected, and at the same time has an axial speed driven by the mainstream, thereby realizing an injection method in which the atomized corrosion inhibitor flows in an axial spiral along the delivery pipeline 331.

[0037] A two-fluid atomizing nozzle is used to atomize the corrosion inhibitor outside the natural gas pipeline into the desired ideal atomized droplet fluid. The atomized corrosion inhibitor is guided by the outer shell 332, the inner shell 333 and the four guide blades 337 to generate a circumferential velocity on the cross section of the natural gas pipeline where the corrosion inhibitor needs to be injected. It is injected into the pipeline and merges with the mainstream flowing along the axial direction of the pipeline (at this time, the atomized corrosion inhibitor fluid has both axial velocity and circumferential velocity), thereby forming a forward spiral flow along the axial direction of the pipeline where the corrosion inhibitor needs to be injected. Through the coordinated use of spiral flow field control technology and fluid atomization technology, the corrosion inhibitor is atomized into droplets and injected into the natural gas transmission pipeline in the form of a spiral flow, thereby enhancing the diffusion of the corrosion inhibitor in the natural gas pipeline, making it more evenly adsorbed on the inner wall of the pipeline to form a corrosion inhibitor liquid film, improving the corrosion inhibition efficiency, and at the same time saving the amount of corrosion inhibitor and reducing the cost of corrosion inhibitor injection.

[0038] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A pipeline corrosion inhibitor injection device, characterized in that: The invention comprises a nitrogen delivery unit (1), a corrosion inhibitor delivery unit (2) and an injection unit (3), wherein the output end of the nitrogen delivery unit (1) is connected to the input end of the injection unit (3), and the output end of the corrosion inhibitor delivery unit (2) is connected to the input end of the injection unit (3); The injection unit (3) comprises an atomizing nozzle (31), an atomizing fluid delivery pipeline (32), and a swirl generating assembly (33); one input end of the atomizing nozzle (31) is connected to the output end of the nitrogen delivery unit (1); the other input end of the atomizing nozzle (31) is connected to the output end of the corrosion inhibitor delivery unit (2); the output end of the atomizing nozzle (31) is connected to the input end of the atomizing fluid delivery pipeline (32); the output end of the atomizing fluid delivery pipeline (32) is connected to the input end of the swirl generating assembly (33); The swirl generating assembly (33) comprises a delivery pipe (331), an outer shell (332), and an inner shell (333) arranged in the outer shell (332). The swirl generating assembly (33) is used to form a spiral flow of the fluid passing through the delivery pipe (331) and to enable the fluid to flow in an axial spiral along the delivery pipe (331). The inner shell (333) surrounds the delivery pipe (331). An input port (3321) is provided at one end of the outer shell (332). An outer layer flow channel is formed between the outer shell (332) and the inner shell (333). (334), the input port (3321) is connected to the outer layer flow channel (334), an inner layer flow channel (335) is formed between the inner shell (333) and the delivery pipe (331), a connection port (336) is passed between the outer layer flow channel (334) and the inner layer flow channel (335), an output port (3311) is provided on the delivery pipe (331), and the output port (3311) is connected to the inner layer flow channel (335), and a plurality of guide vanes (337) are arranged on the wall surface of the inner shell (333) on the side close to the delivery pipe (331).

2. A pipeline corrosion inhibitor injection device according to claim 1, characterized in that: The nitrogen delivery unit (1) comprises a nitrogen source (11), a first control valve (12) and a gas booster pump (13), wherein the output end of the nitrogen source (11) is connected to the input end of the gas booster pump (13) via the first control valve (12), and the output end of the gas booster pump (13) is connected to the input end of the atomizing nozzle (31).

3. A pipeline corrosion inhibitor injection device according to claim 1, characterized in that: The corrosion inhibitor delivery unit (2) comprises a corrosion inhibitor storage tank (21), a second control valve (22) and a peristaltic pump (23); the output end of the corrosion inhibitor storage tank (21) is connected to the input end of the peristaltic pump (23) via the second control valve (22); and the output end of the peristaltic pump (23) is connected to the input end of the atomizing nozzle (31).

4. A pipeline corrosion inhibitor injection device according to claim 1, characterized in that: The connection point between the injection unit (3) and the delivery pipe (331) is the outer peripheral wall of the delivery pipe (331).

5. The pipeline corrosion inhibitor injection device according to claim 1, characterized in that: The input port (3321) and the output port (3311) are arranged on the same side, and the input port (3321) and the connection port (336) are arranged on different sides.

6. A pipeline corrosion inhibitor injection device according to claim 1, characterized in that: Flanges (338) for connecting to natural gas pipelines are installed at both ends of the delivery pipeline (331).

7. The pipeline corrosion inhibitor injection device according to claim 1, characterized in that: The guide blade (337) has a spiral structure.

8. The pipeline corrosion inhibitor injection device according to claim 1, characterized in that: The inner diameter of the inner shell (333) is D1, the outer diameter of the conveying pipe (331) is D2, the length L of the guide vane (337) is 4D1, the width a of the guide vane (337) is 0.02D1, the height h of the guide vane (337) is 0.2D1, D1 is D2+h, the angle α between the tangent line at the trailing edge of the guide vane (337) and the extension line of the leading edge of the guide vane is 40°, the number of the guide vanes (337) is N=4, the fixed bisecting angle β of the guide vanes (337) is 90°, and the guide vanes (337) are arranged on the wall surface of the inner shell (333) at equal intervals of πD1 / 4.

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