Slurry conveying pipeline

Abstract

The utility model discloses a slurry conveying pipeline which comprises a pipe body and at least one protruding part arranged on the inner wall of the pipe body, the protruding part spirally extends in the length direction of the pipe body, and due to the arrangement of the protruding part, slurry in the advancing process can spirally rotate to generate secondary flow, that is, the slurry spirally rotates in the advancing process, so that the secondary flow is generated. Therefore, solid particles in the slurry tend to be concentrated towards the center of the pipeline, direct contact between the solid particles and the pipe wall is reduced, friction force between the slurry and the pipe wall is reduced, and the purposes of improving the slurry conveying efficiency and reducing energy consumption are achieved.

Description

Technical Field

[0001] The utility model relates to an energy-saving conveying pipeline, and more particularly to a slurry conveying pipeline. Background Art

[0002] Slurry transportation generally refers to the use of pipelines to transport solid materials. Pipeline slurry transportation is widely used, including coal slurry, mineral slurry, silt transportation, and the lifting of submarine manganese nodules. Some slurry pipelines transport large quantities of material over very long distances, such as the Shaanxi Shenwei Coal Pipeline Project, which covers a distance of over 700 kilometers and has a designed annual capacity of 10 million tons of clean coal. Therefore, energy-saving solutions for slurry transportation can bring significant economic benefits.

[0003] The slurry in the pipeline is a mixture of solid matter and water. When the slurry moves through the pipeline, the solid matter rubs against the pipe wall, resulting in significant energy loss. Utility Model Content

[0004] An embodiment of the utility model provides a slurry conveying pipeline, which can reduce the friction of solid particles.

[0005] An embodiment of the present utility model also provides a slurry conveying pipeline, comprising: a pipe body, at least one raised portion provided on the inner wall of the pipe body, the raised portion extending spirally along the length direction of the pipe body, and the raised portion being configured to enable the slurry passing through itself to rotate to generate a secondary flow, i.e., spiral rotation, driving the solid particulate matter in the slurry to tend to concentrate toward the radial center of the pipeline, so as to reduce direct contact between the slurry and the pipe wall and reduce the friction of the slurry.

[0006] In an exemplary embodiment, the protrusions include a plurality of protrusions, and the minimum distance between two adjacent protrusions is greater than twice the maximum particle size of the solid particulate matter in the slurry.

[0007] In an exemplary embodiment, the height of the protrusion protruding from the inner wall of the tube body is smaller than the maximum particle size of the solid particulate matter.

[0008] In an exemplary embodiment, the suitable range of the intersection angle α between the spiral line formed by the protrusion and the generatrix of the tube body is preferably 6 to 8 degrees.

[0009] In an exemplary embodiment, the intersection angle α is inversely proportional to the slurry flow rate through the tube.

[0010] In an exemplary embodiment, the proportional relationship between the number of protrusions and the tube diameter is: n≤πD / 2d; wherein n represents the number of protrusions, D represents the tube diameter, and d represents the maximum particle size of the slurry.

[0011] In an exemplary embodiment, the cross-section of the protrusion along the radial direction of the tube body is semicircular or elliptical, so as to reduce the contact force between the solid particles and the protrusion.

[0012] In an exemplary embodiment, the protrusions extend continuously or are arranged discontinuously along the length direction of the tube body.

[0013] In an exemplary embodiment, the protrusion is integrally formed with the tube body or attached to a base material of the tube body.

[0014] In an exemplary embodiment, the pipe body is made of a wear-resistant material, and the wear-resistant material includes high-chromium cast iron.

[0015] The slurry conveying pipeline of the embodiment of the present invention is provided with a spirally extending protrusion along the length direction of the pipe body on the inner wall of the pipe body, which can make the slurry spirally rotate during transportation, driving the solid particulate matter in the slurry to tend to concentrate toward the radial center of the pipe, reducing the direct contact between the solid matter and the pipe wall and reducing the friction between the slurry and the pipe wall.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0018] Figure 1 This is a cross-sectional view of the slurry conveying pipeline along the axial direction of an embodiment of the utility model;

[0019] Figure 2 This is a radial cross-sectional view of a slurry conveying pipeline according to an embodiment of the present utility model;

[0020] Figure 3 This is a view showing the angular relationship between the spiral line and the generatrix formed by the raised portion of the slurry conveying pipe according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any way.

[0022] like Figure 1-Figure 3 As shown, the utility model provides a slurry conveying pipeline 100, comprising: a pipe body 1, at least one raised portion 2 provided on the inner wall of the pipe body 1, the raised portion 2 extending spirally along the length direction of the pipe body 1, and the raised portion 2 is configured to enable the slurry passing through itself to generate a spiral rotation during the forward movement in the pipe body 1 to form a secondary flow (a flow superimposed on the main flow of the slurry), driving the solid particulate matter in the slurry to tend to concentrate toward the radial center of the pipe, so as to reduce the direct contact between the slurry and the pipe wall and reduce the friction of the slurry.

[0023] When a liquid contains solid particles, the solid particles will move toward the center of the circle due to the centripetal force acting on them as the water rotates. This phenomenon is called centripetal rotation. This phenomenon is known as centripetal rotation. Related research, such as "Experiments on the Differential Rotational Inertial Forces on Solid Particles in Rotating Water Flow" (Ma Mingxiang and Mu Zhenwei, "Experiments on the Differential Rotational Inertial Forces on Solid Particles in Rotating Water Flow," People's Yellow River, Vol. 36, No. 2, February 2014), analyzed the forces acting on solid particles in rotating liquids and used a high-speed camera to capture the motion trajectories of the solid particles during the experiment. One key conclusion: the greater the speed of the rotating water flow, the faster the rate at which single solid particles deviate toward the center of the barrel.

[0024] It follows that once the slurry in pipe 1 rotates, the solid particles will tend to move toward the center of the circle, breaking away from direct contact with the pipe wall or reducing contact between the two. Thus, the contact between the slurry and the pipe wall is equivalent to the contact between the liquid itself and the pipe wall, while the friction between the solids and the pipe wall is absent or significantly reduced. This significantly reduces the friction between the slurry and the pipe wall because the friction between the liquid and the pipe wall is low. In contrast, when solid particles slide against the pipe wall, the friction between the pipe wall and the solid particles is much greater.

[0025] Therefore, the slurry conveying pipeline 100 of the embodiment of the present invention is capable of causing the slurry to spirally rotate during transportation by providing a spirally extending protrusion 2 along the length direction of the pipe body 1 on the inner wall of the pipe body 1, driving the solid particulate matter in the slurry to tend to concentrate toward the radial center of the pipe, reducing direct contact with the pipe wall and reducing the friction of the slurry.

[0026] The slurry in the embodiments of the present application is generally coal slurry, mineral slurry, silt, etc., which is a mixture of coal, minerals, soil, etc. and water, with solid matter as the main component. The inner wall of the pipe body 1 of the slurry conveying pipeline 100 in the embodiments of the present application is made of a wear-resistant and corrosion-resistant material, such as high-chromium cast iron. The pipe body 1 includes a pipe wall layer, the thickness of which is determined by strength and stability requirements. The number and height of the raised portions 2 are determined by the diameter of the pipe body 1 and the maximum particle size of the conveyed particulate matter. The raised portions 2 in the embodiments of the present invention are integrally formed with the pipe body 1 or attached to the base material of the pipe body. The base material of the inner wall of the pipe body 1 is generally expensive to meet wear and corrosion resistance requirements. Therefore, the raised portions 2 can be made of a different material from the inner wall of the pipe body 1 (i.e., the raised portions 2 can be attached to the base material of the inner wall of the pipe body 1 through an installation process, such as welding), thereby reducing costs.

[0027] Since the slurry is transported at a certain speed in the pipe body 1, if the spacing between two adjacent protrusions 2 is too small, the probability of collision between the solid particles and the protrusions 2 will increase, and it is easy to get blocked; if it is too large, the rotation ability of the solid particles will be reduced.

[0028] Therefore, if Figure 1-Figure 2 As shown, the raised portion 2 of the embodiment of the present invention includes multiple pieces, and the minimum distance L between two adjacent raised portions 2 is greater than 2 times the maximum particle size of the solid particulate matter in the slurry and less than 3 times the maximum particle size of the solid particulate matter in the slurry, so as to reduce the probability of collision between the solid particulate matter and the raised portion 2, reduce the body resistance, and at the same time ensure that the friction between the solid particulate matter and the inner wall of the tube body 1 is reduced.

[0029] Since the protrusion 2 protrudes from the inner wall of the tube 1 , a larger height h thereof increases the probability of collision between the solid particulate matter and the protrusion 2 , while a smaller height h thereof reduces the rotation ability of the solid particulate matter.

[0030] Therefore, if Figure 2 As shown, in the embodiment of the present invention, the height h of the protrusion 2 protruding from the inner wall of the tube body 1 is smaller than the maximum particle size of the solid particulate matter, so as to reduce the probability of collision between the solid particulate matter and the protrusion 2, reduce the body resistance, and reduce the solid particles from being stuck between two adjacent protrusions, while ensuring that the friction between the solid particulate matter and the inner wall of the tube body 1 is reduced.

[0031] The smaller the intersection angle α between the protrusion 2 and the generatrix of the tube body 1, the lower the rotation ability of the solid particulate matter; the larger the intersection angle α between the protrusion 2 and the generatrix 10 of the tube body 1, the greater the forward resistance of the solid particulate matter.

[0032] Therefore, if Figure 3As shown, in the embodiment of the present invention, the intersection angle α between the spiral line formed by the protrusion 2 and the generatrix of the tube body 1 is in the range of: preferably 6 to 8 degrees, so as to reduce the probability of collision between the solid particles and the protrusion 2, reduce the body resistance, and at the same time ensure that the friction between the solid particles and the inner wall of the tube body 1 is reduced. Generally, it is better to set the intersection angle α to be less than 7 degrees. Since the rotational power of the liquid comes from the forward driving force, the greater the forward speed of the liquid, the smaller α can be selected, and vice versa. Therefore, the intersection angle α is inversely proportional to the slurry flow rate through the tube body.

[0033] Since too many protrusions increase the resistance to slurry movement, while too few protrusions reduce the friction of the slurry to a limited extent, and at the same time, it is necessary to ensure that the density of the protrusions does not affect the passage of slurry particles, the proportional relationship between the number of protrusions and the tube diameter in the embodiment of the present invention is: n≤πD / 2d; wherein n represents the number of protrusions, D represents the diameter of the tube body, and d represents the maximum particle size of the slurry.

[0034] like Figure 2 As shown, the cross-section of the protrusion 2 in the radial direction of the tube body 1 is semicircular or elliptical, which can reduce the body resistance and ensure that the friction between the solid particulate matter and the inner wall of the tube body 1 is reduced.

[0035] The raised portion 2 of the embodiment of the present invention can extend continuously along the length direction of the tube body 1 or be arranged intermittently. Generally, it is not necessary to arrange it at a bend.

[0036] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "'mouth'-shaped structure", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing "this" utility model and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" may refer to a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] Although the embodiments disclosed in the present invention are as described above, the contents described are merely embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art to which the present invention belongs may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention. However, the scope of patent protection of the present invention shall still be defined by the attached claims.

[0039] If solid matter can be prevented from contacting the pipe wall during pipeline transportation, with only the water in contact, the friction between the water and the pipe wall will be greatly reduced, making this an effective way to save energy. This method of slurry transportation can have significant energy-saving implications if the slurry is transported over long periods of time or over long distances.

Claims

1. A slurry conveying pipeline, characterized in that: include: A pipe body and at least one raised portion provided on the inner wall of the pipe body, wherein the raised portion spirally extends along the length direction of the pipe body, and the raised portion is configured to cause the slurry passing through the raised portion to spirally rotate to generate a secondary flow, and the secondary flow drives the solid particulate matter in the slurry to tend to concentrate toward the radial center of the pipe, so as to reduce direct contact between the solid matter in the slurry and the pipe wall, thereby reducing the friction between the slurry and the pipe wall.

2. The slurry conveying pipeline according to claim 1, characterized in that: The protrusions include a plurality of protrusions, and the minimum distance between two adjacent protrusions is greater than twice the maximum particle size of the solid particulate matter in the slurry.

3. The slurry conveying pipeline according to claim 1, characterized in that: The height of the protrusion protruding from the inner wall of the tube body is smaller than the maximum particle size of the solid particulate matter.

4. The slurry conveying pipeline according to claim 1, characterized in that: The intersection angle α between the helical line formed by the protrusion and the generatrix of the tube body is in the range of 6 to 8 degrees.

5. The slurry conveying pipeline according to claim 4, characterized in that: The intersection angle α is inversely proportional to the slurry flow rate passing through the tube.

6. The slurry conveying pipeline according to claim 1, characterized in that: The proportional relationship between the number of raised portions and the tube diameter is: n≤πD / 2d; wherein n represents the number of raised portions, D represents the tube diameter, and d represents the maximum particle size of the slurry.

7. The slurry conveying pipeline according to any one of claims 1 to 6, characterized in that: The cross-section of the protrusion along the radial direction of the tube body is semicircular or elliptical, so as to reduce the contact force between the solid particles and the protrusion.

8. The slurry conveying pipeline according to any one of claims 1 to 6, characterized in that: The protrusions extend continuously or are arranged discontinuously along the length direction of the tube body.

9. The slurry conveying pipeline according to any one of claims 1 to 6, characterized in that: The protrusion is integrally formed with the tube body or attached to a base material of the tube body.

10. The slurry conveying pipeline according to any one of claims 1 to 6, characterized in that: The pipe body is made of wear-resistant material, and the wear-resistant material includes high-chromium cast iron.

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