Erosion resistant tapered tube and method of sizing an erosion resistant tapered tube

Abstract

The application provides an anti-erosion conical pipe and a size determination method for the anti-erosion conical pipe. The conical pipe comprises, in sequence along the flow direction of fluid, a first straight pipe section, which is used for connecting with an inflow pipe; a ring pipe section, one end of which is connected with the first straight pipe section, the end of the ring pipe section away from the first straight pipe section is folded towards the center of the ring pipe section and forms a folded section, and the diameter of the ring pipe section is gradually reduced along the flow direction of fluid; a reduced-diameter pipe section, the outer wall surface of which is connected with the end of the folded section, and an annular channel is formed between the outer annular surface of the ring pipe section and the outer wall surface of the reduced-diameter pipe section, and the first straight pipe section, the ring pipe section and the reduced-diameter pipe section are communicated, and the extension direction of the reduced-diameter pipe section is parallel to the extension direction of the ring pipe section; and a second straight pipe section, which is used for connecting with an outflow pipe. The application solves the problem that the conical pipe is easily eroded and worn in the prior art.

Description

Technical Field

[0001] This invention relates to the field of pipeline transportation equipment technology, and more specifically, to an anti-erosion tapered pipe and a method for determining the dimensions of the anti-erosion tapered pipe. Background Technology

[0002] Once oil and gas are extracted from underground, they cannot be transported without pipelines. Pipeline systems sometimes need to connect pipes of different diameters, and tapered pipes play a crucial role in changing the pipe diameter. During oil and gas development, some solid particles enter the pipeline system along with the extracted medium. To improve transport efficiency, the velocity of the fluid medium is often increased, and the impurities within it also move at higher speeds. According to the principle of continuity, when the fluid medium and solid particles pass through the tapered pipe, the reduced pipe diameter further increases the velocity. This increased velocity causes the solid particles carried by the fluid to move faster, have greater momentum, and experience greater impact force. They then collide intensely at the tapered pipe. Under prolonged high pressure and high temperature conditions, severe erosion and wear occur at the tapered pipe, leading to thinning of the pipe wall and reduced pressure resistance. This poses a threat to the lives of station staff, nearby residents, and related personnel, and also has adverse environmental impacts.

[0003] In other words, existing tapered tubes are susceptible to erosion and wear. Summary of the Invention

[0004] The main objective of this invention is to provide an anti-erosion tapered tube and a method for determining the dimensions of the anti-erosion tapered tube, so as to solve the problem that tapered tubes are easily eroded and worn in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an erosion-resistant tapered pipe is provided, comprising: a first straight pipe section connected sequentially along the flow direction of the fluid, the first straight pipe section being for connection to an incoming flow pipe; an annular pipe section, one end of the annular pipe section being connected to the first straight pipe section, the end of the annular pipe section away from the first straight pipe section being folded towards the center of the annular pipe section to form a folded section, the diameter of the annular pipe section gradually decreasing along the flow direction of the fluid; a reduced-diameter pipe section, the outer wall surface of the reduced-diameter pipe section being connected to the end of the folded section, and an annular channel being formed between the outer annular surface of the annular pipe section and the outer wall surface of the reduced-diameter pipe section, and the first straight pipe section, the annular pipe section, and the reduced-diameter pipe section being in communication, the extension direction of the reduced-diameter pipe section being parallel to the extension direction of the annular pipe section; and a second straight pipe section connected to an outgoing flow pipe.

[0006] Furthermore, the folded section is in the shape of a circular arch, and the radius of curvature of the circular arch is twice the width W of the annular channel.

[0007] Furthermore, the reduced-diameter pipe section with the bend as the boundary includes a first section and a second section. The first section is located outside the annular pipe section, and the second section is located inside the annular pipe section, forming an annular channel with the annular pipe. The total length l2 of the first section and the second section satisfies the following relationship with the length l3 of the second section: l2 = 1.5l3.

[0008] Furthermore, the angle α between the extension direction of the annular pipe section and the first straight pipe section, and the angle β between the extension direction of the reduced diameter pipe section and the second straight pipe section satisfy: α = β.

[0009] Furthermore, the angle α between the extension directions of the annular pipe segment and the first straight pipe segment is greater than or equal to 5° and less than or equal to 10°.

[0010] Furthermore, the erosion-resistant tapered pipe also includes at least one flange, with a first straight pipe section connected to the incoming pipe via a flange; and / or a second straight pipe section connected to the outgoing pipe via a flange.

[0011] Furthermore, the first straight pipe section is welded and fixed to the annular pipe section; and / or the reduced diameter pipe section is welded and fixed to the second straight pipe section.

[0012] According to another aspect of the present invention, a method for determining the size of a tapered tube for erosion prevention is provided. The method comprises: step S10: establishing an initial model of the tapered tube; step S20: measuring and recording the erosion rate of the tapered tube; step S30: determining the adjustment range of the angle α between the extension direction of the annular section and the first straight section of the tapered tube; step S40: adjusting the angle α to form a test model and recording the size data of the test model; step S50: repeating steps S20 to S40 until the size data and erosion rate of all test models are recorded; and step S60: determining the size data of the test model with the lowest erosion rate as the size of the tapered tube.

[0013] Further, step S10 includes: determining the initial dimensions of the tapered tube; determining the flow parameters of the fluid; determining the boundary conditions; and establishing an initial model of the tapered tube based on the initial dimensions, flow parameters, and boundary conditions.

[0014] Furthermore, the process of determining the initial dimensions of the tapered tube includes: determining the diameter D of the first straight section of the tapered tube; determining the diameter d of the second straight section of the tapered tube, wherein the diameter d is smaller than the diameter D; determining the total length l2 of the first and second sections of the tapered tube with reduced diameter; determining the length l3 of the second section of the tapered tube with reduced diameter; determining the length l1 of the outer annular surface of the annular section; determining the angle α between the outer annular surface and the extension direction of the outer wall of the first straight section; determining the angle β between the extension direction of the outer wall of the reduced diameter section and the outer wall of the second straight section; determining the channel width W of the annular channel of the tapered tube; and determining the radius of curvature of the circular arc of the annular section.

[0015] Furthermore, the process of determining the flow parameters of the fluid includes: determining the fluid density; determining the fluid particle density; determining the fluid velocity; determining the fluid particle diameter; and determining the fluid mass flow rate.

[0016] Furthermore, the process of determining the boundary conditions includes: determining the inlet velocity of the fluid in the conical tube.

[0017] Furthermore, in step S30, the adjustment range of the included angle α is greater than or equal to 5° and less than or equal to 10°, and the adjustment interval of the included angle α is 1°.

[0018] According to the technical solution of this invention, the erosion-resistant tapered pipe includes a first straight pipe section, an annular pipe section, a reduced-diameter pipe section, and a second straight pipe section connected sequentially along the flow direction of the fluid. The first straight pipe section is used to connect to the incoming flow pipe. One end of the annular pipe section is connected to the first straight pipe section, and the end of the annular pipe section away from the first straight pipe section is folded towards the center of the annular pipe section to form a folded section. The diameter of the annular pipe section gradually decreases along the flow direction of the fluid. The outer wall surface of the reduced-diameter pipe section is connected to the end of the folded section, and an annular channel is formed between the outer annular surface of the annular pipe section and the outer wall surface of the reduced-diameter pipe section. The first straight pipe section, the annular pipe section, and the reduced-diameter pipe section are connected, and the extension direction of the reduced-diameter pipe section is parallel to the extension direction of the annular pipe section. The second straight pipe section is used to connect to the outgoing flow pipe.

[0019] By setting up parallel annular pipe sections and reduced-diameter pipe sections, and utilizing the folded section to form an annular channel between the outer ring surface of the annular pipe section and the outer wall surface of the reduced-diameter pipe section, the fluid can be diverted, allowing some fluid to enter the annular channel. Since the end of the annular pipe section away from the first straight pipe section folds towards the center of the annular pipe section to form a folded section, that is, the end of the annular pipe section away from the first straight pipe section is closed, the flow state of the fluid is changed. At the folded section, the fluid hardly flows, buffering the impact of solid particles on the conical pipe, reducing the number of times solid particles carried by the fluid impact the conical pipe, and slowing down the erosion rate of the conical pipe. Furthermore, since the annular pipe section is connected to the first straight pipe section, and the outer wall of the reduced-diameter pipe section is connected to the end of the folded section, compared to directly connecting the reduced-diameter pipe section to the first straight pipe section, this solution utilizes the width of the annular channel to relatively reduce the inclination degree between the reduced-diameter pipe section and the annular pipe section, that is, the taper of the tapered pipe, thereby effectively reducing the direct collision of solid particles with the tapered pipe. Therefore, the tapered pipe of this application has the effect of being less susceptible to erosion and wear. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A cross-sectional view of the tapered tube according to Embodiment 1 of the present invention is shown;

[0022] Figure 2 It shows Figure 1 A three-dimensional schematic diagram of a conical tube at one angle;

[0023] Figure 3 It shows Figure 1 A side view of the tapered tube in the image;

[0024] Figure 4 It shows Figure 1 A flowchart illustrating the method for determining the dimensions of tapered tubes used for erosion prevention;

[0025] Figure 5 It shows Figure 1 Erosion rate contour plot of the conical tube in the image;

[0026] Figure 6 An erosion rate contour plot of a prior art tapered tube is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. First straight pipe section; 20. Ring pipe section; 21. Bend section; 30. Reduced diameter pipe section; 31. First section; 32. Second section; 40. Second straight pipe section; 50. Ring channel; 60. Flange. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0032] To address the problem of erosion and wear of tapered tubes in existing technologies, this invention provides an erosion-resistant tapered tube and a method for determining the dimensions of the erosion-resistant tapered tube.

[0033] In this application, the fluid flows sequentially through an inlet pipe, a tapered pipe, and an outlet pipe. Since the inlet and outlet pipes have different diameters, a tapered pipe with a certain taper is needed for connection. However, when the fluid flows at a high speed, the solid particles it carries also move at a high speed, resulting in significant impact on the tapered pipe. The tapered pipe for erosion protection in this application reduces the flow velocity of some fluids by diverting the flow and decreasing the taper, thus reducing erosion and wear on the outer wall of the tapered pipe. Furthermore, it concentrates the erosion of the tapered pipe from the outer wall to the second section 32 of the reduced-diameter section 30 inside the tapered pipe, further mitigating the direct impact of solid particles on the outer wall of the tapered pipe. The erosion-resistant tapered pipe of this application also features a simple structure, low manufacturing cost, and ease of replacement.

[0034] like Figures 1 to 5As shown, the erosion-resistant tapered pipe includes a first straight pipe section 10, an annular pipe section 20, a reduced-diameter pipe section 30, and a second straight pipe section 40 connected sequentially along the fluid flow direction. The first straight pipe section 10 is used to connect to the incoming flow pipe. One end of the annular pipe section 20 is connected to the first straight pipe section 10, and the end of the annular pipe section 20 away from the first straight pipe section 10 is folded towards the center of the annular pipe section 20 to form a folded section 21. The diameter of the annular pipe section 20 gradually decreases along the fluid flow direction. The outer wall surface of the reduced-diameter pipe section 30 is connected to the end of the folded section 21, and an annular channel 50 is formed between the outer annular surface of the annular pipe section 20 and the outer wall surface of the reduced-diameter pipe section 30. The first straight pipe section 10, the annular pipe section 20, and the reduced-diameter pipe section 30 are connected. The extension direction of the reduced-diameter pipe section 30 is parallel to the extension direction of the annular pipe section 20. The second straight pipe section 40 is used to connect to the outflow pipe.

[0035] By setting up annular pipe section 20 and reduced diameter pipe section 30 with parallel extension directions, and using folded section 21 to form annular channel 50 between the outer ring surface of annular pipe section 20 and the outer wall surface of reduced diameter pipe section 30, the fluid can be diverted, allowing some fluid to enter the annular channel 50. Since the end of annular pipe section 20 away from the first straight pipe section 10 is folded towards the center of annular pipe section 20 to form folded section 21, that is, the end of annular pipe section 20 away from the first straight pipe section 10 is closed, the flow state of the fluid is changed. At folded section 21, the fluid hardly flows, buffering the impact of solid particles on the conical pipe, reducing the number of times solid particles carried by the fluid impact the conical pipe, and slowing down the erosion rate of the conical pipe. Furthermore, since the annular pipe section 20 is connected to the first straight pipe section 10, and the outer wall of the reduced diameter pipe section 30 is connected to the end of the folded section 21, compared to directly connecting the reduced diameter pipe section 30 to the first straight pipe section 10, this solution utilizes the width of the annular channel 50 to relatively reduce the inclination degree between the reduced diameter pipe section 30 and the annular pipe section 20, that is, the taper of the tapered pipe, thereby effectively reducing the direct collision of solid particles with the tapered pipe. Therefore, the tapered pipe of this application has the effect of being less susceptible to erosion and wear.

[0036] like Figure 1 As shown, the folded section 21 is in the shape of a circular arc arch, and twice the radius of curvature of the circular arc arch is equal to the width W of the annular channel 50. That is to say, viewed in cross-section along the central axis of the tapered tube, one side of the circular arc arch is a semi-circular surface. The outer ring surface of the annular tube section 20, which extends parallel to the diameter of the semi-circular surface, and the outer wall surface of the reduced diameter tube section 30 form the annular channel 50. This arrangement facilitates the reduction of fluid velocity within the annular channel 50 and also facilitates the formation of the annular tube section 20.

[0037] like Figure 1As shown, the reduced-diameter pipe section 30, with the bend section 21 as the boundary, includes a first section 31 and a second section 32. The first section 31 is located on the outside of the annular pipe section 20, and the second section 32 is located on the inside of the annular pipe section 20, forming an annular channel 50 between them. The total length l2 of the first section 31 and the second section 32 is in the same relationship as the length l3 of the second section 32: l2 = 1.5l3. This arrangement utilizes the second section 32 of the reduced-diameter pipe section 30 to guide the flow. At the same time, the second section 32 is in the flow-facing position, making the second section 32 the location of the greatest fluid erosion. This reduces the erosion of the outer wall of the tapered pipe by the fluid and avoids severe wear or even leakage of the tapered pipe.

[0038] like Figure 1 As shown, the angle α between the extension directions of the annular pipe section 20 and the first straight pipe section 10, and the angle β between the extension directions of the reduced-diameter pipe section 30 and the second straight pipe section 40 satisfy: α = β. That is, the extension directions of the first straight pipe section 10 and the second straight pipe section 40 are the same, and the extension direction of the reduced-diameter pipe section 30 is parallel to the extension direction of the annular pipe section 20.

[0039] Specifically, the angle α between the extension directions of the annular pipe section 20 and the first straight pipe section 10 is greater than or equal to 5° and less than or equal to 10°. This arrangement keeps the taper of the conical pipe within a small range, which helps to reduce the direct collision of solid particles with the outer wall of the conical pipe, thereby extending the service life of the conical pipe.

[0040] like Figures 1 to 3 As shown, the erosion-resistant tapered pipe also includes at least one flange 60. Optionally, the first straight pipe section 10 is connected to the inlet pipe via the flange 60; optionally, the second straight pipe section 40 is connected to the outlet pipe via the flange 60. This ensures the stability of the connection between the two ends of the tapered pipe and the inlet and outlet pipes, and also facilitates the replacement of the tapered pipe or the accumulation of solid impurities inside the tapered pipe.

[0041] Optionally, the first straight pipe section 10 is welded to the annular pipe section 20; alternatively, the reduced-diameter pipe section 30 is welded to the second straight pipe section 40. Welding ensures the stability of the connection and prevents leakage at the joint.

[0042] like Figure 4As shown, the present invention also provides a method for determining the size of a tapered tube for erosion prevention, used to determine the size of the tapered tube for erosion prevention of this application. The method for determining the size of the tapered tube for erosion prevention includes: Step S10: establishing an initial model of the tapered tube; Step S20: measuring the erosion rate on the second segment 32 of the tapered tube's reduced diameter section 30 and recording the erosion rate; Step S30: determining the adjustment range of the angle α between the annular section 20 of the tapered tube and the extension direction of the first straight section 10 of the tapered tube; Step S40: adjusting the size of the angle α to form a test model and recording the size data of the test model; Step S50: repeating steps S20 to S40 until the size data and erosion rate of all test models are recorded; Step S60: determining the size data of the test model with the lowest erosion rate as the size of the tapered tube.

[0043] By establishing an initial model of the tapered tube in step S10 and measuring the erosion rate on the second section 32 of the reduced-diameter pipe section 30, the overall erosion degree of the tapered tube can be simulated. Then, through steps S30 and S40, the included angle α, which is the taper of the tapered tube, is adjusted at certain intervals. In step S50, the erosion rate on the second section 32 of the reduced-diameter pipe section 30 is recorded in time each time the included angle α is adjusted. After recording all values ​​of α within the adjustment range of the included angle α, the size of the test model with the smallest erosion rate is selected as the final size of the tapered tube in step S60.

[0044] Specifically, step S10 includes: determining the initial dimensions of the tapered tube; determining the flow parameters of the fluid; determining the boundary conditions; and establishing an initial model of the tapered tube based on the initial dimensions, flow parameters, and boundary conditions.

[0045] The following details the process of determining the initial dimensions of the tapered tube, including: determining the diameter D of the first straight section 10 of the tapered tube; determining the diameter d of the second straight section 40 of the tapered tube, where diameter d is smaller than diameter D; determining the total length l2 of the first and second sections of the reduced-diameter section 30 of the tapered tube; determining the length l3 of the second section 32 of the reduced-diameter section 30 of the tapered tube; determining the length l1 of the outer annular surface of the annular section 20; determining the angle α between the outer annular surface and the extension direction of the outer wall of the first straight section 10; determining the angle β between the outer wall of the reduced-diameter section 30 and the extension direction of the outer wall of the second straight section 40; determining the channel width W of the annular channel of the tapered tube; and determining the radius of curvature r of the circular arc of the annular section 20. Wherein, l2 = 1.5l3, α = β, and W = 2r. It should be noted that D and d are equal to the inner diameters of the inlet and outlet pipes, respectively.

[0046] Specifically, determining the flow parameters of a fluid includes: determining the fluid density; determining the fluid particle density; determining the fluid velocity; determining the fluid particle diameter; and determining the fluid mass flow rate. This is done to simulate the application environment of the tapered tube, thereby more accurately determining the lifespan of the tapered tube under that application environment.

[0047] Specifically, determining the boundary conditions includes determining the fluid inlet velocity in the conical tube. The fluid inlet velocity in the conical tube is equal to the fluid velocity itself.

[0048] Example 1

[0049] like Figures 1 to 6 As shown, the initial dimensions of the tapered tube in this embodiment are: D = 100 mm, d = 60 mm, l1 = l2 = 1.5 l3 = 56 mm, α = β = 5°, and the lengths of the first straight tube segment 10 and the second straight tube segment 40 along the central axis of the tapered tube are both L.

[0050] Fluid flow parameters: Fluid density 890 kg / m³ 3 The particle density is 1500 kg / m³. 3 The velocity V is 10 m / s, the particle diameter is 0.2 mm, and the mass flow rate is 0.01 kg / s;

[0051] The boundary conditions are set as follows: the inlet is the inlet velocity, which is equal to the fluid velocity; the outlet is free flow; and other boundaries are set as walls.

[0052] Specifically, the adjustment range of the included angle α is greater than or equal to 5° and less than or equal to 10°, with an adjustment interval of 1°. Within this range, multiple sets of test model dimensional data and erosion rates can be obtained, allowing the set with the lowest erosion rate to be selected as the final size of the tapered tube for this application scenario. Through simulation, α = β = 8°, and r = 5mm were chosen.

[0053] Measurement results show that the maximum erosion rate of the tapered tube in this embodiment is 6.38 × 10⁻⁶. -8 kg / (m 2 ·s).

[0054] Under the same environmental conditions, the specific parameters of the existing conical tube are: D = 100 mm, d = 60 mm, and the length of the entire conical tube along the fluid flow direction is 77 mm. The erosion rate of this existing conical tube is 5.74 × 10⁻⁶. -8 kg / (m 2 Although the maximum erosion rate of the tapered tube in this embodiment is greater than that of a conventional tapered tube, observations show that... Figure 5 and Figure 6It can be seen that the maximum erosion rate in this embodiment mainly occurs at the second section 32 of the tapered pipe section 30, which is a non-critical part, and the difference is within an acceptable range. Furthermore, the erosion rate on the entire tapered pipe is relatively low. Figure 6 The erosion rate on the tapered tube shown in the prior art is much lower.

[0055] In summary, this embodiment can significantly reduce the erosion rate on the tapered tube, thereby extending the service life of the tapered tube.

[0056] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0057] 1. The end of the annular pipe section 20 away from the first straight pipe section 10 is closed, which changes the flow state of the fluid. At the bend section 21, the fluid hardly flows, which buffers the impact of solid particles on the conical pipe, reduces the number of impacts of solid particles carried by the fluid on the conical pipe, and slows down the erosion rate of the conical pipe.

[0058] 2. The width of the annular channel 50 reduces the inclination of the reduced-diameter pipe section 30 and the annular pipe section 20, which is the taper of the tapered pipe. This effectively reduces the direct collision of solid particles with the tapered pipe, so the tapered pipe of this application is not easily eroded or worn.

[0059] 3. The second section 32 of the reduced diameter pipe section 30 serves as a flow guide. At the same time, the second section 32 is in the flow-facing position, so that the second section 32 is the position with the greatest fluid erosion. This reduces the erosion of the outer wall of the tapered pipe by the fluid and avoids the tapered pipe from being severely worn or even leaking.

[0060] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An erosion-resistant tapered pipe, characterized in that, The tapered tube comprises components connected sequentially along the direction of fluid flow: The first straight pipe section (10) is used to connect to the incoming flow pipe; An annular pipe section (20) is provided, one end of which is connected to the first straight pipe section (10). The end of the annular pipe section (20) away from the first straight pipe section (10) is folded towards the center of the annular pipe section (20) to form a folded section (21). The diameter of the annular pipe section (20) is gradually reduced along the flow direction of the fluid. A reduced-diameter pipe section (30) is formed between the outer wall of the reduced-diameter pipe section (30) and the end of the folded section (21), and an annular channel (50) is formed between the outer annular surface of the annular pipe section (20) and the outer wall of the reduced-diameter pipe section (30). The first straight pipe section (10), the annular pipe section (20) and the reduced-diameter pipe section (30) are connected. The extension direction of the reduced-diameter pipe section (30) is parallel to the extension direction of the annular pipe section (20). The second straight pipe section (40) is used to connect to the outlet pipe; The reduced-diameter pipe section (30) with the folded section (21) as the boundary includes a first section (31) and a second section (32). The first section (31) is located outside the annular pipe section (20), and the second section (32) is located inside the annular pipe section (20) and forms the annular channel (50) with the annular pipe section (20). The total length l2 of the first section (31) and the second section (32) satisfies the following relationship with the length l3 of the second section (32): l2 = 1.5l3; Wherein, the end of the annular pipe section (20) away from the first straight pipe section (10) is closed to change the flow state of the fluid, so that the fluid does not flow at the fold section (21); The second section (32) of the reduced diameter pipe section (30) serves to guide the fluid, and the second section (32) is in the flow-facing position to reduce the erosion of the tapered pipe by the fluid.

2. The erosion-resistant tapered pipe according to claim 1, characterized in that, The folded section (21) is in the shape of a circular arc arch, and the radius of curvature of the circular arc arch is twice the width W of the annular channel (50).

3. The erosion-resistant tapered pipe according to claim 1, characterized in that, The angle α between the extension direction of the annular pipe section (20) and the first straight pipe section (10) and the angle β between the extension direction of the reduced diameter pipe section (30) and the second straight pipe section (40) satisfy: α=β.

4. The erosion-resistant tapered pipe according to claim 3, characterized in that, The angle α between the annular pipe segment (20) and the extension direction of the first straight pipe segment (10) is greater than or equal to 5° and less than or equal to 10°.

5. The erosion-resistant tapered pipe according to any one of claims 1 to 4, characterized in that, The erosion-resistant tapered tube also includes at least one flange (60). The first straight pipe section (10) is connected to the incoming flow pipe via the flange (60); and / or The second straight pipe section (40) is connected to the outlet pipe via the flange (60).

6. The erosion-resistant tapered pipe according to any one of claims 1 to 4, characterized in that, The first straight pipe section (10) is welded and fixed to the annular pipe section (20); and / or The reduced diameter pipe section (30) is welded and fixed to the second straight pipe section (40).

7. A method for determining the dimensions of a tapered tube for erosion prevention, characterized in that, The dimensional determination method is used to determine the dimensions of the erosion-resistant tapered tube according to any one of claims 1 to 6, wherein the dimensional determination method for the erosion-resistant tapered tube includes: Step S10: Establish the initial model of the tapered tube; Step S20: Measure the erosion rate of the tapered tube and record the erosion rate; Step S30: Determine the adjustment range of the angle α between the extension direction of the annular pipe section (20) of the tapered pipe and the first straight pipe section (10) of the tapered pipe; Step S40: Adjust the included angle α to form a test model, and record the size data of the test model; Step S50: Repeat steps S20 to S40 until the dimensional data and erosion rate of all the test models are recorded; Step S60: Determine the size data of the test model with the lowest erosion rate as the size of the tapered tube.

8. The method for determining the dimensions of a tapered tube for erosion prevention according to claim 7, characterized in that, Step S10 includes: Determine the initial dimensions of the tapered tube; Determine the flow parameters of the fluid; Determine the boundary conditions; An initial model of the tapered tube is established based on the initial dimensions, the flow parameters, and the boundary conditions.

9. The method for determining the dimensions of a tapered tube for erosion prevention according to claim 8, characterized in that, The process of determining the initial dimensions of the tapered tube includes: Determine the diameter D of the first straight pipe section (10); The diameter d of the second straight section (40) of the tapered tube is determined, and the diameter d is smaller than the diameter D; Determine the total length l2 of the first section (31) and the second section (32) of the tapered tube (30); Determine the length l3 of the second segment (32); Determine the length l1 of the outer annular surface of the annular pipe segment (20); Determine the angle α between the outer annular surface and the extension direction of the outer wall surface of the first straight pipe section (10); Determine the angle β between the outer wall surface of the reduced diameter pipe section (30) and the extension direction of the outer wall surface of the second straight pipe section (40); Determine the channel width W of the annular channel (50) of the tapered tube; Determine the radius of curvature of the circular arch of the annular pipe section (20).

10. The method for determining the dimensions of a tapered tube for erosion prevention according to claim 8, characterized in that, The process of determining the flow parameters of the fluid includes: The fluid density of the fluid; Determine the particle density of the fluid; Determine the velocity of the fluid; Determine the particle diameter of the fluid; Determine the mass flow rate of the fluid.

11. The method for determining the dimensions of a tapered tube for erosion prevention according to claim 8, characterized in that, The process of determining the boundary conditions includes: determining the inlet velocity of the fluid in the conical tube.

12. The method for determining the dimensions of a tapered tube for erosion prevention according to claim 7, characterized in that, In step S30, the adjustment range of the included angle α is greater than or equal to 5° and less than or equal to 10°, and the adjustment interval of the included angle α is 1°.

Images