A method for designing the position of heat exchange tubes in a tubular heat exchanger and a tubular heat exchanger

Abstract

The present invention relates to the technical field of heat exchangers, and particularly to a method for designing the position of heat exchange tubes of a tubular heat exchanger and a tubular heat exchanger. The design method includes the following steps: starting from the center point of the transverse plane of the heat exchanger shell, making a clockwise Fibonacci spiral and a counterclockwise Fibonacci spiral with a set initial radius, and circumferentially arraying a set number of times; arranging the first row of heat exchange tubes at the intersection points of the clockwise and counterclockwise Fibonacci spirals located on the same selected circumference; making the clockwise and counterclockwise Fibonacci spirals with the next set initial radius, and circumferentially arraying the next set number of times, and arranging the next row of heat exchange tubes at the intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral located on the same set circumference, and repeating this step until the entire heat exchanger shell is filled. It can solve the problem that the existing arrangement method will cause vortices in the flow channels inside the heat exchanger, ultimately resulting in inconsistent heat transfer capabilities of each heat exchange tube.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a method for designing the position of heat exchange tubes of a tubular heat exchanger and a tubular heat exchanger. Background Art

[0002] Tubular heat exchangers are a type of heat exchanger widely used in industrial production and are also key components of many industrial products. Therefore, designing high-performance tubular heat exchangers is an effective way to improve industrial production capacity.

[0003] Currently, the tube arrangement of the used tubular heat exchanger adopts a staggered arrangement method. Such an arrangement method will cause vortices to be generated in the flow channels inside the heat exchanger, increase the resistance of the corridor channels, result in inconsistent flow velocities of the heat exchange fluids in each area inside the heat exchanger, and ultimately lead to inconsistent heat transfer capabilities of each heat exchange tube, and the overall heat exchange performance of its tube bundle cannot be exerted. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for designing the position of heat exchange tubes of a tubular heat exchanger and a tubular heat exchanger, which can solve the problems that the existing arrangement method will cause vortices to be generated in the flow channels inside the heat exchanger, increase the resistance of the corridor channels, resulting in inconsistent flow velocities of the heat exchange fluids in each area inside the heat exchanger, and ultimately lead to inconsistent heat transfer capabilities of each heat exchange tube.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] On the one hand, the present invention provides a method for designing the position of heat exchange tubes of a tubular heat exchanger, including the following steps:

[0007] Taking the center point of the transverse plane of the heat exchanger shell as the starting point, draw a clockwise Fibonacci spiral and a counterclockwise Fibonacci spiral with a set initial radius, and circumferentially array a set number of times; set the first row of heat exchange tubes at the intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral on the same selected circumference.

[0008] Draw a clockwise Fibonacci spiral and a counterclockwise Fibonacci spiral with the next set initial radius, and circumferentially array the next set number of times. Set the next row of heat exchange tubes at the intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral on the same set circumference. The next set initial radius is a set multiple of the previous set radius, and the next set number of times is a set multiple of the previous set number of times. Repeat this step until the entire heat exchanger shell is filled.

[0009] In some alternative solutions, the set initial radius is the radius of the heat exchange tube.

[0010] In some alternative embodiments, the distance between the centers of every two heat exchange tubes in the first row of heat exchange tubes, as well as the distance between the center of each heat exchange tube and the center point of the transverse plane, are both within a first set range.

[0011] In some alternative embodiments, the distance between the centers of every two heat exchange tubes in each row of heat exchange tubes, as well as the distance between the center of the heat exchange tubes in the next row and the center of the inner heat exchange tubes, are within a first set range.

[0012] In some alternative embodiments, the first set range is not less than 1.25 times the outer diameter of the heat exchange tube and not greater than 1.75 times the outer diameter of the heat exchange tube.

[0013] In some alternative embodiments, the set multiple is 1.3 - 1.6 times.

[0014] In some alternative embodiments, the set number of times is 5 - 7 times.

[0015] In some alternative embodiments, when filling the entire heat exchanger housing, if the distance from the outermost heat exchange tube to the inner wall of the heat exchanger housing through the heat exchange tube spacing is not within a second set range, then by adjusting the set multiple, the distance from the outermost heat exchange tube to the inner wall of the heat exchanger housing through the heat exchange tube spacing is made within the second set range.

[0016] In some alternative embodiments, the second set range is not less than 0.5 times the outer diameter of the heat exchange tube, not greater than the outer diameter of the heat exchange tube, and not less than 8 mm.

[0017] On the other hand, the present invention also provides a tubular heat exchanger, and the positions of the heat exchange tubes in the tubular heat exchanger are designed by using the above-mentioned design method for the positions of the heat exchange tubes in the tubular heat exchanger.

[0018] Compared with the prior art, the advantages of the present invention are as follows: A tubular heat exchanger designed by using the above-mentioned design method for the positions of the heat exchange tubes in the tubular heat exchanger. Compared with the staggered arrangement of heat exchange tubes in the prior art, by improving the flow channels inside the heat exchanger, reducing the deteriorated vortices, the resistance loss of its corridor channels is reduced, and the pressure drop of the heat exchanger is lowered. From the perspective of heat exchange, it interrupts the periodic repetitive movement of the fluid during staggered arrangement, effectively compensates for the deterioration of heat transfer caused by the fluid front stagnation point of the heat exchange tubes, and the above can effectively improve the comprehensive performance of the tubular heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1It is a top - view structural schematic diagram of a tubular heat exchanger in an embodiment of the present invention;

[0021] Figure 2 It is a front - view structural schematic diagram of a tubular heat exchanger in an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of a counter - clockwise Fibonacci spiral in an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of arranging the first - loop heat exchange tubes in an embodiment of the present invention.

[0024] In the figure: 1. Heat exchange tube; 2. Heat exchanger shell; 21. Inlet; 22. Outlet. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0026] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0027] The present invention provides a method for designing the positions of heat exchange tubes in a tubular heat exchanger, including the following steps:

[0028] As shown in Figure 3 and Figure 4 : S1: Starting from the center point of the transverse plane of the heat exchanger shell 2, draw a clockwise Fibonacci spiral and a counter - clockwise Fibonacci spiral with a set initial radius, and circumferentially array them a set number of times; set the first - loop heat exchange tubes 1 at the intersection points of the clockwise Fibonacci spiral and the counter - clockwise Fibonacci spiral on the same selected circumference.

[0029] In some optional embodiments, the set initial radius is the radius of the heat exchange tube. Then: for the clockwise Fibonacci spiral and the counter - clockwise Fibonacci spiral, the parameters defined by a recursive method are: F0 = radius of the heat exchange tube; F1 = radius of the heat exchange tube; F2 = F0 + F1; F3 = F 2+ F1. In this embodiment, the diameter of the heat exchange tube is 19 mm. Then, F0 = 19 mm; F1 = 19 mm; F2 = F0 + F1; F3 = F 2+ F1.

[0030] A heat exchange tube 1 is also provided on the central axis of the heat exchanger shell 2. [[ID=!44]]

[0031] Between the centers of every two heat exchange tubes in the first row of heat exchange tubes 1, and the distance between the center of each heat exchange tube and the center point of the transverse plane are both within a first set range. The first set range is not less than 1.25 times the outer diameter of the heat exchange tube and not greater than 1.75 times the outer diameter of the heat exchange tube. Such a design can provide a good distance between each heat exchange tube, and there is sufficient space for the heat exchange fluid to flow between the heat exchange tubes in the heat exchanger housing 2.

[0032] When the distance between the centers of every two heat exchange tubes in the first row of heat exchange tubes 1, or the distance between the center of each heat exchange tube and the center point of the transverse plane is not within the first set range, by adjusting the set number of times of the circumferential array, the distance between every two heat exchange tubes is made to be within the first range.

[0033] In some alternative embodiments, the set number of times is 5 - 7 times. That is, the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral are circumferentially arrayed 5 - 7 times. In this example, the circumferential array is 6 times, so that the distance between every two heat exchange tubes can be made more reasonable.

[0034] As Figure 1 shown, S2: Make the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral of the next set initial radius, and circumferentially array the next set number of times. Set the next row of heat exchange tubes at the intersection points where the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral are located on the same set circumference. The next set initial radius is a set multiple of the previous set radius, and the next set number of times is a set multiple of the previous set number of times. Repeat this step until the entire heat exchanger housing 2 is filled.

[0035] In some alternative embodiments, the set multiple is 1.3 - 1.6 times. In this embodiment, 1.5 times is taken. That is, the setting position of the next row of heat exchange tubes is the set initial radius that is 1.5 times the previous set initial radius. Make the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral, and circumferentially array the number of times that is 1.5 times the previous set number of times, to obtain 1.5 times the intersection points and 1.5 times the number of heat exchange tubes in the previous row.

[0036] That is, for the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral in the next row, the parameters defined by the recursive method are: F0 = 1.5 × the previous set initial radius; F1 = 1.5 × the previous set initial radius; F2 = F0 + F1; F3 = F2 + F1. The set initial radius in the first row is the radius of the heat exchange tube. Then, for the set initial radius corresponding to the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral in the second row, the parameters defined by the recursive method are: F0 = 1.5 × the radius of the heat exchange tube; F1 = 1.5 × the radius of the heat exchange tube; F2 = F0 + F1; F3 = F 2+F1. In this example, the diameter of the heat exchange tube is 19 mm. The parameters corresponding to the second circle are: F0 = 28.5 mm; F1 = 28.5 mm; F2 = F0 + F1; F3 = F 2+ F1. The number of circumferential arrays in the first circle is 6, so the number of circumferential arrays in the second circle is 1.5×6 = 9. That is, the number of intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral corresponding to the first circle is 6, and 6 heat exchange tubes are set. The number of intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral corresponding to the heat exchange tubes in the second circle is 9, and 9 heat exchange tubes are set.

[0037] In addition, the number of circumferential arrays in the third circle is 1.5×9 = 13.5. Since there is no integer number of circumferential arrays, the number of circumferential arrays in the third circle is taken as 14 times. The parameters of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral corresponding to the heat exchange tubes in the third circle are: F0 = 42.8 mm; F1 = 42.8 mm; F2 = F0 + F1; F3 = F 2+ F1. The number of intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral corresponding to the heat exchange tubes in the third circle is 14, and 14 heat exchange tubes 1 are set.

[0038] The number of circumferential arrays in the third circle is 1.5×14 = 21. The parameters of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral corresponding to the heat exchange tubes in the third circle are: F0 = 64 mm; F1 = 64 mm; F2 = F0 + F1; F3 = F 2+ F1. The number of intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral corresponding to the heat exchange tubes in the third circle is 21, and 21 heat exchange tubes 1 are set.

[0039] In addition, between the centers of every two heat exchange tubes in each circle of heat exchange tubes, and between the center of the heat exchange tubes in the next circle and the center of the inner heat exchange tubes, the distance is within the first set range. By adjusting the set multiple of the circumferential array, the distance between every two heat exchange tubes is within the first range.

[0040] In some alternative embodiments, when filling the entire heat exchanger housing 2, if the distance from the outermost heat exchange tube to the inner wall of the heat exchanger housing through the heat exchange tube interval is not within the second set range, then by adjusting the set multiple, the distance from the outermost heat exchange tube to the inner wall of the heat exchanger housing through the heat exchange tube interval is made within the second set range.

[0041] In this embodiment, the second set range is not less than 0.5 times the outer diameter of the heat exchange tube, not greater than the outer diameter of the heat exchange tube, and not less than 8 mm. Such a design can make the distance between each heat exchange tube 1 and between the heat exchange tube 1 and the heat exchanger housing 2 better, and can make there be sufficient space between the heat exchange tubes in the heat exchanger housing for the heat exchange fluid to flow.

[0042] Such as Figure 1 andFigure 2 As shown in Figure 2 , on the other hand, the present invention also provides a tubular heat exchanger, which includes: a heat exchanger housing 2 and heat exchange tubes disposed therein. The positions of the heat exchange tubes in the heat exchanger housing 2 are designed by using the above-mentioned design method for the positions of the heat exchange tubes of the tubular heat exchanger.

[0043] The heat exchanger housing 2 is provided with an inlet 21 and two outlets 22. The inlet 21 is located below the heat exchanger housing 2, and the outlets 22 are located above the heat exchanger housing 2.

[0044] In summary, a tubular heat exchanger designed by using the above-mentioned design method for the positions of the heat exchange tubes of the tubular heat exchanger. Compared with the staggered arrangement of the heat exchange tubes in the prior art, by improving the flow channels inside the heat exchanger, reducing the deteriorated vortices, and reducing the resistance loss of its corridor channels, the pressure drop of the heat exchanger is reduced. From the perspective of heat transfer, it interrupts the periodic repetitive movement of the fluid during staggered arrangement, effectively compensates for the deterioration of heat transfer caused by the fluid stagnation point in front of the heat exchange tubes, and the above can effectively improve the comprehensive performance of the tubular heat exchanger.

[0045] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0046] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0047] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for designing the position of heat exchange tubes in a tubular heat exchanger, characterized in that, It includes the following steps: Starting from the center point of the transverse plane of the heat exchanger shell, draw a clockwise Fibonacci spiral and a counterclockwise Fibonacci spiral with a set initial radius, and circumferentially array a set number of times; set the first row of heat exchange tubes at the intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral on the same selected circumference; Draw a clockwise Fibonacci spiral and a counterclockwise Fibonacci spiral with the next set initial radius, and circumferentially array the next set number of times. Set the next row of heat exchange tubes at the intersection points of the clockwise Fibonacci spiral and the counterclockwise Fibonacci spiral on the same set circumference. The next set initial radius is a set multiple of the previous set radius, and the next set number of times is a set multiple of the previous set number of times. Repeat this step until the entire heat exchanger shell is filled.

2. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 1, wherein: The set initial radius is the radius of the heat exchange tube.

3. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 2, characterized in that: The distance between the centers of every two heat exchange tubes in the first row of heat exchange tubes, and the distance between the center of each heat exchange tube and the center point of the transverse plane are all within the first set range.

4. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 2, wherein: The distance between the centers of every two heat exchange tubes in each row of heat exchange tubes, and the distance between the center of the next row of heat exchange tubes and the center of the inner heat exchange tubes are within the first set range.

5. The design method for the position of the heat exchange tubes of the tubular heat exchanger according to claim 3 or 4, characterized in that: The first set range is not less than 1.25 times the outer diameter of the heat exchange tube and not greater than 1.75 times the outer diameter of the heat exchange tube.

6. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 1, characterized in that: The set multiple is 1.3 - 1.6 times.

7. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 1, characterized in that: The set number of times is 5 - 7 times.

8. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 1, characterized in that: When the entire heat exchanger shell is filled, if the distance from the outermost heat exchange tube to the inner wall of the heat exchanger shell at the heat exchange tube interval is not within the second set range, adjust the set multiple so that the distance from the outermost heat exchange tube to the inner wall of the heat exchanger shell at the heat exchange tube interval is within the second set range.

9. The design method of the heat exchange tube position of the tubular heat exchanger according to claim 8, characterized in that: The second set range is not less than 0.5 times the outer diameter of the heat exchange tube, not greater than the outer diameter of the heat exchange tube, and not less than 8 mm.

10. A tubular heat exchanger, characterized in that: The position of the heat exchange tubes in the tubular heat exchanger is designed by using the design method for the position of the heat exchange tubes in the tubular heat exchanger according to any one of claims 1 - 9.

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