Cooling tower air cooling heat exchanger

Abstract

The utility model provides an air-cooling heat exchanger of a cooling tower, and relates to the technical field of heat exchange equipment. Comprising a heat exchanger core body which comprises an upper tube plate, a lower tube plate and a plurality of flying wing type finned tubes; the flying wing type finned tube is a flat tube, and flying wing type fins are arranged on two opposite wide surfaces of the flying wing type finned tube; the multiple flying wing type finned tubes are arranged between the upper tube plate and the lower tube plate in parallel. And an upper pipe cap and a lower pipe cap. According to the heat exchanger core body, the flat-tube-shaped flying wing type finned tubes are adopted as the heat exchange tubes and are used for cooling the triangular units, so that cold air can continuously flow towards the axis of a tower after being input into the heat exchanger core body of the heat exchanger, baffling is reduced, the operation wind resistance of the cold air is effectively reduced, and the heat exchange efficiency is improved. The overall cold input is increased, and the heat exchange efficiency is improved; the fluid pipelines and the flying wing type fins of the flying wing type finned tube are integrally formed, the internal heat transfer capacity is maximized, meanwhile, the overall structural strength of the flying wing type finned tube is enhanced, and the heat exchange efficiency is further improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, specifically to an air-cooled heat exchanger for a cooling tower. Background Technology

[0002] Cooling towers are important heat dissipation devices used in many industrial processes to cool hot water or hot fluids, such as in power plants, chemical plants, oil refineries, and steel mills. Cooling towers help reduce process temperatures and maintain normal equipment operation. Taking thermal power plants as an example, cooling towers are crucial equipment used to cool the generator sets and power generation equipment. Their function is to exchange heat between the cooling water carrying waste heat and the air inside the tower, transferring the waste heat to the air and dissipating it into the atmosphere, thereby ensuring the normal operation of the equipment. Based on the different ways water and air come into contact, cooling towers can be divided into wet cooling towers and standard cooling towers.

[0003] Traditional cooling towers mostly use direct spray wet cooling tower systems, which enhance heat exchange by spraying or atomizing water. However, wet cooling towers lose 10-20% of their water through evaporation while dissipating heat, resulting in resource waste. To save water, cooling towers use hot water flowing inside the heat dissipation pipes, achieving cooling through contact heat transfer caused by the temperature difference between the pipes and the outside air, thus realizing a closed-loop hot water circulation for heat dissipation and avoiding water loss.

[0004] To accommodate more heat exchangers within a limited space, existing cooling towers employ a triangular arrangement around the base, consisting of multiple rows of heat exchange tubes. The outer side serves as the air inlet, while the inner two sides each house a heat exchanger, forming a cooling triangle unit. During operation, cold air enters through the inlet of this cooling triangle unit. After heat exchange, the air flows towards the tower axis, encountering at least two deflections between the heat exchanger surface and the internal heat exchange tubes, increasing flow resistance. Excessive air resistance in the cooling triangle leads to insufficient cooling airflow and a decrease in the cooling performance of the air-cooled system. Therefore, reducing the air resistance of the cooling triangle is a pressing technical problem that needs to be addressed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses an air-cooled heat exchanger for cooling towers, which solves the problem that when cold air is input into the cooling triangular heat exchanger during cooling tower operation, the flow is obstructed due to the deflection between the heat exchange tubes.

[0006] To achieve the above technical objectives, this utility model proposes an air-cooled heat exchanger for cooling towers, which includes:

[0007] Heat exchanger core: includes an upper tube sheet, a lower tube sheet and multiple finned tubes; the finned tubes are flat tubes with finned fins on two opposite wide surfaces; multiple finned tubes are arranged in parallel between the upper tube sheet and the lower tube sheet.

[0008] Upper tube cap: The wing-shaped finned tube is connected to the upper tube cap via the upper tube sheet, and the space formed by the upper tube cap and the upper tube sheet is used to collect and distribute the heat exchange medium;

[0009] Lower tube cap: The finned tube is connected to the lower tube cap via the lower tube sheet, and the space formed by the lower tube cap and the lower tube sheet is used to collect and distribute the heat exchange medium.

[0010] In the above technical solution, the heat exchanger core adopts a flat tubular finned tube as the heat exchange tube. The fluid channel and finned tube of the finned tube are integrally formed, and there is no contact thermal resistance between the finned tube and the inner channel. This maximizes the internal heat transfer capacity and enhances the overall structural strength of the finned tube, significantly improving the heat exchange efficiency of the heat exchanger. In addition, multiple finned tubes are arranged in parallel rows to form an air cooler tube bundle that can be freely arranged at an angle relative to the length of the air cooler. Compared with the arrangement of heat exchange tubes in existing heat exchangers, this avoids the condition of cold air being deflected multiple times between the heat exchange tubes after entering the heat exchanger core, improving the cold air circulation efficiency. This achieves both heat exchange capacity and significantly reduces wind resistance.

[0011] In addition, compared with existing heat exchangers with multiple rows of heat exchange tubes, the present invention simplifies the equipment and reduces the process preparation and maintenance costs.

[0012] Furthermore, the angle α between the wing-shaped finned tube and the length direction of the air-cooled heat exchanger is a right angle or an acute angle, preferably an acute angle.

[0013] Furthermore, the range of values ​​for α satisfies 25°≤α≤50°.

[0014] Furthermore, the flying wing fin is a metal sheet formed by shaving the surface of the flying wing fin tube.

[0015] Furthermore, the multiple flying wing-shaped fins are evenly spaced and parallel to each other.

[0016] Furthermore, the flying wing-shaped fin is perpendicular to the flying wing-shaped fin tube.

[0017] Furthermore, the adjacent flying wing finned tubes are arranged in a staggered or partially staggered manner.

[0018] Furthermore, the narrow surface of the wing-shaped finned tube is either a plane or an arc surface.

[0019] Furthermore, side beams are provided on both sides of the heat exchanger core; even further, the side beams are parallel to the wing-shaped finned tube.

[0020] Furthermore, the air-cooled heat exchanger is fed from top to bottom or from bottom to bottom.

[0021] Furthermore, the upper tube sheet is welded to or flanged to the upper tube cap.

[0022] Furthermore, the lower tube sheet is welded to or flanged to the lower tube cap.

[0023] Furthermore, the upper tube sheet and / or the lower tube sheet are welded to the wing-shaped finned tube.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: the heat exchanger core adopts a flat tube-shaped finned tube as the heat exchange tube. When used in the cooling triangular unit, the cold air can continuously flow towards the tower axis after entering the heat exchanger core and exchanging heat with the air cooler tube bundle arranged at a free angle. This reduces deflection and effectively reduces the operating wind resistance of the cold air, thereby increasing the overall cold input and improving the heat exchange efficiency. The fluid pipe and finned tube of the finned tube of this utility model are integrally formed, which maximizes the internal heat transfer capacity while enhancing the overall structural strength of the finned tube, further improving the heat exchange efficiency. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0026] Figure 1 This diagram shows a structural representation of the air-cooled heat exchanger for a cooling tower according to the present invention. Note that, for the sake of brevity, the heat exchange medium inlet and outlet are not shown in the diagram.

[0027] Figure 2 A structural diagram of a flying wing finned tube is shown;

[0028] Figure 3 This is a top view of the upper tube sheet of the air-cooled heat exchanger of the cooling tower according to the present invention;

[0029] Figure 4 This invention presents another top view of the upper tube sheet of the air-cooled heat exchanger in the cooling tower.

[0030] Figure 5 This diagram shows another top view of the upper tube sheet of the air-cooled heat exchanger in the cooling tower according to this invention. It should be noted that, for the sake of brevity, Figure 1 , Figures 3-5 The flying fins on the flying finned tube are not shown.

[0031] The above figures include the following reference numerals:

[0032] 1-Flying finned tube, 11-Flying fin, 21-Upper tube sheet, 22-Lower tube sheet, 31-Upper tube cap, 32-Lower tube cap, 4-Side beam. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below, along with preferred embodiments. However, it should be understood that these embodiments are merely for more detailed explanation and should not be construed as limiting the utility model in any way, i.e., not limiting the scope of protection of this utility model.

[0034] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which this invention pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.

[0035] Example 1

[0036] A cooling tower air-cooled heat exchanger, such as Figure 1 As shown, the heat exchanger includes:

[0037] Heat exchanger core: includes upper tube sheet 21, lower tube sheet 22 and multiple finned tubes 1; the finned tubes 1 are flat tubes with finned fins 11 on two opposite wide surfaces; multiple finned tubes 1 are arranged in parallel between upper tube sheet 21 and lower tube sheet 22.

[0038] Upper tube cap 31: The finned tube 1 is connected to the upper tube cap 31 via the upper tube sheet 21. The space formed by the upper tube cap 31 and the upper tube sheet 21 is used to collect and distribute the heat exchange medium.

[0039] Lower tube cap 32: The finned tube 1 is connected to the lower tube cap 32 via the lower tube sheet 22. The space formed by the lower tube cap 32 and the lower tube sheet 22 is used for inputting heat exchange medium, collecting and distributing heat exchange medium, and outputting heat exchange medium.

[0040] Figure 2 The structure of a flying wing finned tube 1 is shown.

[0041] The heat exchanger of this embodiment is used in the cooling triangle unit of a cooling tower in a thermal power plant. During operation, cooling water carrying waste heat from upstream is input into the heat exchanger core through the heat exchange medium inlet of the lower cap 32 of the heat exchanger and flows within the flow channel of the finned tube 1. It exchanges heat with the cold air input into the cooling triangle unit through the finned tubes 11 on the side wall. Furthermore, the upper cap 31 and lower cap 32 combine to collect and distribute the cooling water, enhancing the contact between the cooling water and the cold air to promote heat transfer. The cold air is input through the air inlet of the cooling triangle unit and reaches the heat exchanger, where it contacts the finned tubes 11 for heat exchange. The air after heat exchange passes directly through the heat exchanger into the axial direction of the cooling tower and is finally discharged from the top of the cooling tower. A continuous supply of cold air is continuously input into the cooling tower, providing sufficient cooling capacity for the cooling water to cool down. The cooled water, after being cooled down, eventually collects in the lower cap 32 and exits through the heat exchange medium outlet to return to the upstream thermal power generation unit for recycling.

[0042] Compared to existing cooling towers that use multiple rows of heat exchange tubes in a cooling triangle for heat exchange, this embodiment uses a single row of parallel flat tubular finned tubes 1 as the core of the heat exchanger. After the cold air comes into contact with the core of the heat exchanger, it does not need to be deflected between multiple rows of heat exchange tubes. It can efficiently flow into the axial direction of the cooling tower along with the finned tubes 11, effectively reducing the resistance to the flow of cold air. This enhances the heat exchange between the cold air and the finned tubes and increases the overall input cold capacity to fully cool the cooling water. Furthermore, the structure of the heat exchanger in this embodiment is simpler, reducing equipment processing and operating costs.

[0043] Optionally, the upper cap 31 and lower cap 32 of this utility model are provided with several baffles, thereby dividing the flow of the heat exchanger core into reverse directions and guiding the cooling water to flow in a zigzag manner within the air-cooled heat exchanger.

[0044] It should be noted that this utility model does not limit the material of the heat exchanger. For example, the wing-shaped finned tube 1 can be made of aluminum alloy, such as the wing-shaped finned tube 1 made of industrial aluminum profiles of series 1 to 6, which reduces the overall weight of the heat exchanger and reduces the processing difficulty of the wing-shaped fin 11. The upper tube sheet 21, lower tube sheet 22, upper tube cap 31 and lower tube cap 32 can be made of the same or different metal materials as the wing-shaped finned tube 1.

[0045] Example 2

[0046] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, the angle α between the finned tube 1 and the longitudinal direction of the heat exchanger is not limited; it can be a right angle or an acute angle, preferably an acute angle. The finned tubes 1 are arranged in parallel rows between the upper and lower tube sheets, thus forming an air-cooled tube bundle with a free angle arrangement. For the sake of brevity, the included angle in this invention is the smaller of the complementary angles when two planes intersect.

[0047] In this embodiment, the angle α between the wing-shaped finned tube 1 and the length direction of the heat exchanger was optimized.

[0048] Optionally, the angle α between the wing-shaped finned tube 1 and the length direction of the heat exchanger is an acute angle. This is beneficial for adjusting the value of α according to the angle between the windward side of the heat exchanger and the input cold air during the subsequent assembly of the cooling tower and cooling triangular unit. This ensures that the wing-shaped finned tube 1 is perpendicular or nearly perpendicular to the air inlet side of the cooling triangular unit, thereby minimizing the obstruction of the tube bundle arrangement to the flow of cold air. Figure 3 An example where α is an acute angle is shown.

[0049] Optionally, the angle α between the wing-shaped finned tube 1 and the length direction of the heat exchanger satisfies 25°≤α≤50°. This allows the cold air entering from the air inlet of the cooling tower to be directly input into the heat exchanger and further directly into the axial direction of the cooling tower, avoiding airflow deflection. This is beneficial for the interaction between the cold air and the flat-tube-shaped wing-shaped finned tube and effectively reduces wind resistance.

[0050] Example 3

[0051] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, the wing-shaped fin 11 is a metal sheet formed by scraping the surface of the wing-shaped finned tube 1. In the specific processing, the wing-shaped fin 11 is directly generated by scraping the side wall of the wing-shaped finned tube 1 by scraping with a scraper. The wing-shaped finned tube 1 and the wing-shaped fin 11 with the integrated structure achieve non-contact thermal resistance in the heat conduction process, which improves the heat exchange efficiency between cold air and cooling water.

[0052] Example 4

[0053] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, optionally, multiple flying wing fins 11 are evenly spaced and parallel to each other, which is conducive to full contact with cold air and promotes the uniformity of heat exchange of the entire heat exchanger.

[0054] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, the included angle between the wing-shaped fin 11 and the wing-shaped finned tube 1 is not limited and can be either vertical or acute. In this embodiment, the included angle between the wing-shaped fin 11 and the wing-shaped finned tube 1 has been optimized.

[0055] Optionally, the flying wing fin 11 is perpendicular to the flying wing finned tube 1. Understandably, the radiant heat between the flying wing fin 11 and the flying wing finned tube 1 is related to the solid angle between them. Figure 2 When the flying wing fin 11 is perpendicular to the flying wing fin tube 1, it not only improves the radiative heat transfer effect, but also further reduces the wind resistance of cold air flow.

[0056] It should be noted that the specific shape of the flying wing fin 11 is not limited in this embodiment. For example, it can be selected as a straight line, an arc, or a wave shape. The specific working condition can be selected as needed.

[0057] Example 5

[0058] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, the wing-shaped finned tubes 1 in this embodiment are arranged in one or more rows along the length of the heat exchanger, thereby improving the flexibility of the arrangement of the wing-shaped finned tubes 1 in the air-cooled heat exchanger of the cooling tower of this utility model, so as to meet the heat exchange requirements of more working conditions. Figure 4 An example of the upper tube sheet of an air-cooled heat exchanger is shown, in which two rows of finned tubes 1 are arranged along the normal direction of the heat exchanger.

[0059] Optionally, adjacent flying wing finned tubes 1 are arranged in a staggered manner. Figure 5 An example of an offset arrangement of adjacent flying finned tubes 1 is shown, which can accommodate more heat exchange requirements under various operating conditions.

[0060] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, the narrow side of the wing-type finned tube 1 in this embodiment is a plane or an arc surface, that is, the cross-section of the wing-type finned tube 1 can be selected as a square flat tube or a round flat tube, which can be selected as needed in the specific process.

[0061] Example 6

[0062] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, the feeding method of the air-cooled heat exchanger is either top-in / bottom-out or bottom-in / bottom-out. In the specific process, a heat exchange medium inlet can be set at the upper cap 31 and a heat exchange medium outlet can be set at the lower cap 32, so that the cooling water carrying waste heat output from the upstream power generation unit enters the air-cooled heat exchanger for heat exchange and cooling through the "top-in / bottom-out" method; alternatively, a heat exchange medium inlet and a heat exchange medium outlet can be set on the lower cap 32, so that the heat-carrying cooling water forms a "bottom-in / bottom-out" flow pattern in the air-cooled heat exchanger.

[0063] It should be noted that the present invention does not limit the specific positions of the heat exchange medium inlet and outlet relative to the air-cooled heat exchanger. For example, they can be simultaneously or separately set in front of or behind the air-cooled heat exchanger, on the left or right side, or in other settings. Those skilled in the art can choose according to their needs, and this does not limit the scope of protection of the present invention.

[0064] Example 7

[0065] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, in this embodiment, side beams 4 can be optionally provided on both sides of the heat exchanger core. By providing side beams 4 on the side of the heat exchanger core, the air-cooled heat exchanger can be supported and strength protection can be provided. Further optionally, the side beams 4 are parallel to the finned tubes 1, which helps to improve the stability of the air-cooled heat exchanger structure and reduce the difficulty of equipment processing.

[0066] Example 8

[0067] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, in this embodiment, the upper tube sheet 21 and the upper tube cap 31 can be welded or flanged; optionally, the lower tube sheet 22 and the lower tube cap 32 can be welded or flanged; the choice can be made as needed in actual working conditions.

[0068] Example 9

[0069] Based on the air-cooled heat exchanger of the cooling tower shown in Embodiment 1, in this embodiment, the upper tube sheet 21 and / or the lower tube sheet 22 are welded to the finned tube 1. This welding seal provides stability for the operation of the equipment, allowing the cooling water entering the heat exchanger to collect and be distributed between the upper tube cap 31 and the lower tube cap 32 via the upper tube sheet 21 and the lower tube sheet 22, thereby promoting contact heat exchange between the cooling water and the cold air.

[0070] It should be noted that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions; the dimensional data in this embodiment do not limit the technical solution, but merely illustrate one specific working condition. For those skilled in the art to which this invention pertains, several simple improvements and modifications can be made without departing from the concept of the present invention, and all such improvements and modifications should be considered to fall within the scope of protection of the present invention.

Claims

1. A cooling tower air cooled heat exchanger characterized by, The application relates to a heat exchanger core body, which comprises an upper tube plate (21), a lower tube plate (22) and a plurality of flying-wing finned tubes (1); the flying-wing finned tube (1) is a flat tube, two opposite wide surfaces of the flying-wing finned tube (1) are provided with flying-wing fins (11); the plurality of flying-wing finned tubes (1) are arranged in parallel between the upper tube plate (21) and the lower tube plate (22). An upper tube cap (31) is arranged in communication with the flying-wing finned tubes (1) through the upper tube plate (21), and a space formed by the upper tube cap (31) and the upper tube plate (21) is used for collecting and distributing heat exchange medium. A lower tube cap (32) is arranged in communication with the flying-wing finned tubes (1) through the lower tube plate (22), and a space formed by the lower tube cap (32) and the lower tube plate (22) is used for collecting and distributing heat exchange medium. The included angle alpha between the flying-wing finned tube (1) and the length direction of the air-cooled heat exchanger is a right angle or an acute angle.

2. The cooling tower air cooled heat exchanger according to claim 1, wherein, The value range of alpha satisfies 25 DEG ≤ alpha ≤ 50 DEG.

3. The cooling tower air cooled heat exchanger according to claim 2, wherein, The flying-wing fin (11) is a metal sheet formed by cutting the surface of the flying-wing finned tube (1).

4. The cooling tower air cooled heat exchanger according to claim 1, wherein, The flying-wing fin (11) is linear, arc-shaped or wavy. The flying-wing fin (11) is perpendicular to the flying-wing finned tube (1).

5. The cooling tower air cooled heat exchanger according to claim 1, wherein, The flying-wing finned tubes (1) are arranged in one row or multiple rows along the length direction of the heat exchanger.

6. The cooling tower air cooled heat exchanger according to claim 1, wherein, The adjacent flying-wing finned tubes (1) are arranged in a staggered mode. Side beams (4) are arranged on both sides of the heat exchanger core body.

7. The cooling tower air cooled heat exchanger according to claim 1, wherein, The narrow surface of the flying-wing finned tube (1) is a plane or an arc surface.

8. The cooling tower air cooled heat exchanger according to claim 1, wherein, The upper tube plate (21) and the upper tube cap (31) are welded or flange-connected.

9. The cooling tower air cooled heat exchanger according to claim 1, wherein, The lower tube plate (22) and the lower tube cap (32) are welded or flange-connected. The upper tube plate (21) and / or the lower tube plate (22) are welded to the flying-wing finned tubes (1).

10. The cooling tower air cooled heat exchanger according to claim 1, wherein, ​

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