A heat and mass transfer tube insert and heat and mass transfer pipe

Abstract

This invention provides an enhanced heat and mass transfer tube insert and a heat and mass transfer conduit. The insert is a tubular body, the wall of which is composed of multiple alternating near-wall guide sections and central guide sections. The near-wall guide sections are outwardly convex structures arranged along the axial direction of the tubular body, and the central guide sections are inwardly concave structures arranged along the axial direction of the tubular body. Turbulence holes are uniformly arranged on both the near-wall and central guide sections, and each turbulence hole is equipped with a turbulence plate extending into or out of the tubular body wall. By providing turbulence holes and turbulence plates on both the near-wall and central guide sections, this invention allows the near-wall guide sections to direct fluid near the wall of the heat and mass transfer tube to the center, and the central guide sections to direct fluid from the center of the heat and mass transfer tube to the near-wall, generating radial turbulence, breaking the laminar flow state within the heat and mass transfer tube, and improving the heat and mass transfer coefficient.

Description

Technical Field

[0001] This invention relates to the field of heat and mass transfer technology, specifically to an enhanced heat and mass transfer tube insert and a heat and mass transfer pipeline. Background Technology

[0002] Heat and mass transfer equipment is an important component in industries such as petroleum, chemical, energy, power, and metallurgy. As the main heat and mass transfer element of a heat and mass transfer device, the heat and mass transfer tube directly affects the overall heat and mass transfer performance.

[0003] There are generally two types of enhanced heat and mass transfer technologies within pipes: one is based on the surface of the heat and mass transfer tube, such as grooved tubes and corrugated tubes. These mainly enhance heat and mass transfer by disturbing the fluid through different structures on the tube wall, thus disrupting the fluid boundary layer near the tube wall. The other is based on the fluid within the tube, such as spiral ribbons, spiral coils, and spiral blades inserted into the tube. These disturb or mix the fluid within the tube, making the temperature of the fluid region more uniform and thinning the thermal boundary layer, thereby enhancing heat and mass transfer. The former, using irregularly shaped tubes, is difficult to manufacture and has lower strength compared to round tubes, limiting its applicability; the latter is difficult to disassemble, and although it increases turbulence, dead zones can still easily appear inside the tube. Summary of the Invention

[0004] In view of this, the present invention provides a heat and mass transfer tube insert and a heat and mass transfer pipe that can break the laminar flow state inside the heat and mass transfer tube, enhance fluid disturbance, and improve heat and mass transfer efficiency.

[0005] This invention provides an enhanced heat and mass transfer tube insert, wherein the insert is a tubular body, the tube wall of which is composed of multiple alternating near-wall guide sections and central guide sections. The near-wall guide section is an outwardly convex structure arranged along the axial direction of the tubular body, and the central guide section is an inwardly concave structure arranged along the axial direction of the tubular body. The near-wall guide section and the central guide section are uniformly provided with turbulence holes, and each turbulence hole is provided with a turbulence plate at one end.

[0006] Preferably, the near-wall guide portion and the central guide portion are integrally formed, and the baffle is integrally formed with the tubular body.

[0007] Preferably, the near-wall guide portion is an outwardly convex arc shape, and multiple outwardly convex arc-shaped near-wall guide portions are connected together by a central guide portion, which is an inwardly concave arc shape.

[0008] Preferably, the convex tube walls of the plurality of near-wall guide portions are in close contact with the inner wall of the heat and mass transfer tube, and the diameter of the circumscribed circle formed by the plurality of near-wall guide portions is smaller than the diameter of the inner wall of the heat and mass transfer tube.

[0009] Preferably, the baffles on the near-wall guide section and the central guide section extend into or out of the tubular body.

[0010] Preferably, the inclination direction of the near-wall guide section is the same as or opposite to that of the baffle plate on the central guide section, and it can be in the same direction as the fluid or in the opposite direction to the fluid.

[0011] Preferably, one of the near-wall guide section and the central guide section has a spoiler that is positioned opposite to the other, or both of the spoilers on both sections are positioned opposite to each other.

[0012] Preferably, the near-wall guide section, the central guide section, and the baffle plate are pressed with convex or concave guide patterns to enhance the disturbance of the fluid.

[0013] Preferably, three sets of near-wall guide portions and three sets of central guide portions are provided, and the cross-section of the plug is clover-shaped.

[0014] A second aspect of the present invention provides a heat and mass transfer tube in which the above-mentioned enhanced heat and mass transfer tube insert is installed.

[0015] The advantages and positive effects of this invention are:

[0016] 1. The present invention provides turbulence holes and turbulence plates in both the near-wall guide section and the central guide section. The near-wall guide section guides the fluid near the wall of the heat transfer tube to the center, and the central guide section guides the fluid in the center of the heat transfer tube to the near wall, generating radial turbulence, breaking the laminar flow state in the heat transfer tube, and improving the heat transfer coefficient.

[0017] 2. The entire tubular body is integrally molded, with a simple structure and easy manufacturing. There are no moving parts, so there will be no phenomenon of individual parts falling off, thus preventing damage to the entire tubular body.

[0018] 3. A certain gap is provided between the near-wall guide section and the tube wall of the heat transfer and mass transfer tube to prevent the formation of dead zones in the fluid. At the same time, the convex tube wall of the near-wall guide section is as close as possible to the tube wall of the heat transfer and mass transfer tube to interfere with the fluid with the lowest flow velocity near the tube wall, thereby accelerating the heat transfer and mass transfer rate.

[0019] 4. The present invention can select baffles with different tilt directions according to the different requirements of heat transfer and mass transfer process for resistance and enhanced heat transfer and mass transfer.

[0020] 5. The outer wall of the tubular body is pressed with flow-guiding patterns to enhance the disturbance of the fluid. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0023] Figure 3 This is a schematic diagram showing the positional relationship between the plug-in and the heat and mass transfer tube of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure when the inclination direction of the near-wall guide section and the spoiler on the central guide section of the present invention is opposite;

[0025] Figure 5 This is a schematic diagram of the structure of the spoiler at the central guide section of the present invention when they are arranged opposite each other;

[0026] Figure 6 This is a schematic diagram of the structure of the present invention, in which both the near-wall guide portion and the baffle plate on the central guide portion extend into the interior of the tubular body. Detailed Implementation

[0027] To better understand the present invention, the present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0028] like Figures 1 to 3 As shown, the present invention provides an enhanced heat and mass transfer tube insert, the insert being a tubular body 10. The tube wall of the tubular body 10 is composed of a plurality of alternating near-wall guide portions 101 and central guide portions 102. The near-wall guide portions 101 are outwardly convex structures arranged along the axial direction of the tubular body 10, and the central guide portions 102 are inwardly concave structures arranged along the axial direction of the tubular body 10. The near-wall guide portions 101 and the central guide portions 102 are uniformly provided with turbulence holes 103, and a turbulence plate 104 is provided at one end of each turbulence hole 103.

[0029] When the fluid flows at low speed in the heat and mass transfer tube 20, it exhibits laminar flow. Its particles move smoothly in a straight line along a direction parallel to the tube axis. The fluid velocity is the highest at the center of the tube and the lowest near the wall, making heat and mass transfer difficult. The heat transfer and mass transfer tube insert of the present invention is disposed inside the heat transfer and mass transfer tube 20. The near-wall guide portion 101, due to its convex structure, is disposed near the inner wall of the heat transfer and mass transfer tube 20. The central guide portion 102, due to its concave structure, extends to the center of the heat transfer and mass transfer tube 20. Both the near-wall guide portion 101 and the central guide portion 102 are provided with turbulence holes 103 and turbulence plates 104. The near-wall guide portion 101 guides the fluid near the wall of the heat transfer and mass transfer tube 20 to the center, and the central guide portion 102 guides the fluid at the center of the heat transfer and mass transfer tube 20 to the near wall, generating radial turbulence, breaking the laminar flow state inside the heat transfer and mass transfer tube 20, and improving the heat transfer and mass transfer coefficient.

[0030] Furthermore, in a specific embodiment of the present invention, the near-wall guide portion 101 and the central guide portion 102 are integrally formed, and the baffle plate 104 is integrally formed with the tubular body 10. In this embodiment, the entire tubular body 10 is integrally formed, which has a simple structure, is easy to manufacture, has no moving parts, and will not cause the phenomenon of individual parts falling off, thereby causing damage to the entire tubular body 10.

[0031] Furthermore, the near-wall guiding portion 101 is an outwardly convex arc shape, and multiple outwardly convex arc-shaped near-wall guiding portions 101 are connected together by a central guiding portion 102. The central guiding portion 102 is an inwardly concave arc shape. The outwardly convex tube walls of the multiple near-wall guiding portions 101 are in close contact with the inner wall of the heat transfer tube. The diameter of the circumscribed circle formed by the multiple near-wall guiding portions 101 is smaller than the inner wall diameter of the heat transfer tube 20. In a specific embodiment of the present invention, the diameter of the circumscribed circle is 1-2 mm smaller than the inner wall diameter of the heat transfer tube 20. In this embodiment, a certain gap is provided between the near-wall guiding portion 101 and the tube wall of the heat transfer tube 20 to prevent the formation of dead zones for the fluid. At the same time, the outwardly convex tube walls of the near-wall guiding portions 101 are as close as possible to the tube wall of the heat transfer tube 20 to interfere with the fluid with the lowest flow velocity near the wall of the heat transfer tube 20, thereby accelerating the heat transfer rate.

[0032] Furthermore, in one embodiment of the present invention, the baffles 104 on the near-wall guide portion 101 and the central guide portion 102 extend into or out of the tubular body 10. In this embodiment, the baffles 104 interfere with the flow direction of the fluid, and through the interference of the baffles 104, the fluid is disturbed radially in the heat transfer and mass transfer tube 10.

[0033] Furthermore, the inclination direction of the near-wall guide section 101 and the baffle 104 on the central guide section 102 is the same or opposite, and can be in the direction of the fluid or in the opposite direction of the fluid.

[0034] like Figures 1 to 3 As shown, in a specific embodiment of the present invention, the baffle 104 on the near-wall guide portion 101 extends into the interior of the tubular body 10, and the baffle 104 on the central guide portion 102 extends outward from the tubular body 10; and in this embodiment, the baffle 104 on the near-wall guide portion 101 and the central guide portion 102 have the same tilt direction, and during installation, the tilt direction of the baffle 104 can be in the direction of the fluid or in the opposite direction of the fluid.

[0035] Furthermore, such as Figure 4As shown, in another specific embodiment of the present invention, the baffle 104 on the near-wall guide portion 101 extends into the interior of the tubular body 10, and the baffle 104 on the central guide portion 102 extends outward from the tubular body 10. In this embodiment, the inclination directions of the baffle 104 on the near-wall guide portion 101 and the central guide portion 102 are opposite. In this embodiment, when the inclination direction of the baffle 104 on the near-wall guide portion 101 is in the direction of the fluid, the inclination direction of the baffle 104 on the central guide portion 102 is in the opposite direction to the fluid. When the inclination direction of the baffle 104 on the near-wall guide portion 101 is in the opposite direction to the fluid, the inclination direction of the baffle 104 on the central guide portion 102 is in the direction of the fluid.

[0036] In yet another specific embodiment of the invention, such as Figure 5 As shown, the baffles 104 on the near-wall guide section 101 extend into the interior of the tubular body 10, and the baffles 104 on the central guide section 102 extend outward from the tubular body 10. In this embodiment, the baffles 104 on the near-wall guide section 101 have the same inclination direction, and adjacent baffles 104 on the central guide section 102 are arranged opposite to each other. "Against each other" means that the adjacent baffles 104 on the near-wall guide section 101 and / or the central guide section 102 have opposite inclination directions. Similarly, the baffles 104 on the central guide section 102 can also be arranged with the same inclination direction, and adjacent baffles 104 on the near-wall guide section 101 are arranged opposite to each other, or both the baffles 104 on the near-wall guide section 101 and the central guide section 102 are arranged opposite to each other.

[0037] like Figure 6 As shown, in another specific embodiment of the present invention, the baffles 104 on the near-wall guide portion 101 and the central guide portion 102 both extend into the interior of the tubular body 10. Similarly, in this embodiment, the tilting directions of the baffles 104 on the near-wall guide portion 101 and the central guide portion 102 can also be set to be in the same direction, opposite direction, or opposite direction as needed.

[0038] In addition, the baffle 104 on the near-wall guide section 101 can also extend outward.

[0039] The present invention allows for the selection of different tilting directions for the baffles 104 based on varying requirements for resistance and enhanced heat and mass transfer in the heat and mass transfer process. For example, under conditions where resistance requirements are relatively low, the tilting direction of the baffles 104 is aligned with the fluid direction. Because the tilting direction of the baffles 104 is aligned with the fluid direction, the resulting resistance is low, and dead zones are less likely to occur. Furthermore, the baffle holes 103 can be parallel to the axis of the tubular body 10 or deflected at a certain angle.

[0040] Furthermore, in one embodiment of the present invention, the near-wall guide portion 101, the central guide portion 102, and the baffle plate 104 are pressed with outwardly convex or inwardly concave guide patterns to enhance the disturbance of the fluid. Specifically, circular, elliptical, or elongated grooves can be punched on the near-wall guide portion 101 to achieve turbulent flow and disturbance of the fluid.

[0041] In one specific embodiment of the present invention, three sets of near-wall guide portions 101 and three sets of central guide portions 101 are provided, and the cross-section of the plug is clover-shaped. In other embodiments, the number of sets of near-wall guide portions 101 and central guide portions 101 is not limited and can be set as needed.

[0042] The present invention provides turbulence holes 103 and turbulence plates 104 in both the near-wall guide section 101 and the central guide section 102. The near-wall guide section 101 guides the fluid near the wall of the heat transfer tube 20 to the center, and the central guide section 102 guides the fluid in the center of the heat transfer tube 20 to the near wall, generating radial turbulence, breaking the laminar flow state in the heat transfer tube 20, and improving the heat transfer coefficient.

[0043] A second aspect of the present invention provides a heat and mass transfer tube, wherein the aforementioned insert is disposed within the heat and mass transfer tube.

[0044] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. A heat and mass transfer tube insert with enhanced heat and mass transfer capabilities, characterized in that: The plug is a tubular body. The tube wall is composed of multiple alternating near-wall guide sections and central guide sections. The near-wall guide sections are outwardly convex structures arranged along the axial direction of the tube, and the central guide sections are inwardly concave structures arranged along the axial direction of the tube. The near-wall guide sections are outwardly convex arc-shaped, and multiple outwardly convex arc-shaped near-wall guide sections are connected together by the central guide sections. The central guide sections are inwardly concave arc-shaped. There are three sets of each of the near-wall guide sections and the central guide sections. The cross-section of the plug is clover-shaped. The wall of the near-wall guide section is in close contact with the inner wall of the heat and mass transfer tube. The diameter of the circumscribed circle formed by the multiple near-wall guide sections is smaller than the diameter of the inner wall of the heat and mass transfer tube to prevent the formation of dead zones in the fluid. The near-wall guide section and the central guide section are uniformly provided with turbulence holes. A turbulence plate is provided at one end of each turbulence hole. The turbulence plates on the near-wall guide section and the central guide section extend into or out of the tubular body. The inclination direction of the turbulence plates on the near-wall guide section and the central guide section is the same or opposite, and can be in the direction of the fluid or against the direction of the fluid.

2. The enhanced heat and mass transfer tube insert according to claim 1, characterized in that: The near-wall guide section and the central guide section are integrally formed, and the baffle is integrally formed with the tubular body.

3. The enhanced heat and mass transfer tube insert according to claim 1, characterized in that: In the near-wall guide section and the central guide section, a spoiler is arranged opposite to each other at one point, or the spoilers on both sections are arranged opposite to each other.

4. The enhanced heat and mass transfer tube insert according to claim 1, characterized in that: The near-wall guide section, the central guide section, and the baffle plate are pressed with outwardly convex or inwardly concave guide patterns to enhance the disturbance of the fluid.

5. A heat and mass transfer pipe, characterized in that: The heat and mass transfer pipe is equipped with a reinforced heat and mass transfer pipe insert as described in any one of claims 1 to 4.

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