An air cooling tower flow field reconstruction system with a labyrinth-type flow guide device

Abstract

The present invention relates to the technical field of air-cooling towers, and specifically to an air-cooling tower flow field reconstruction system with a labyrinth-type flow guide device, comprising an air-cooling tower body, an air-cooling tower radiator, and a labyrinth-type flow guide device, wherein the air-cooling tower radiator is arranged at the bottom of the air-cooling tower body, and multiple pairs of labyrinth-type flow guide devices are arranged circumferentially along the air-cooling tower radiator; the labyrinth-type flow guide device comprises a cover plate, a side plate, an L-shaped back plate, and a windshield, wherein the inner side of the cover plate is connected to the air-cooling tower body, and the outer side of the cover plate is connected to the upper end of the side plate; the lower end of the side plate is fixed to the ground, and the side plate is an arc-shaped structure with an opening facing the air-cooling tower radiator; one side of the L-shaped back plate is connected to the cover plate, and the other side of the L-shaped back plate is connected to the side plate, and the L-shaped back plate is arranged on the leeward side of the labyrinth-type flow guide device; the inner side of the windshield is connected to the air-cooling tower radiator, the lower end of the windshield is fixed to the ground, and the windshield is arranged on the windward side of the labyrinth-type flow guide device. The present invention can improve the ventilation characteristics of the air-cooling tower under all working conditions and improve the heat exchange efficiency of the air-cooling tower.

Description

Technical Field

[0001] The present invention relates to the technical field of air cooling towers, and in particular to an air cooling tower flow field reconstruction system with a labyrinth-type flow guide device. Background Art

[0002] Air-cooled power generation, as a highly efficient, water-saving, and environmentally friendly thermal power generation technology, has seen rapid development in global power generation in recent years, particularly in countries and regions with relatively scarce water resources. Its widespread application is a growing trend. Indirect air cooling, a form of air cooling technology, has gradually gained widespread acceptance in the power industry due to its quietness, long lifespan, simple maintenance, and energy efficiency. Unlike wet cooling towers, indirect air cooling towers utilize the natural buoyancy of air passing through surface heat exchangers to remove heat. This makes their cooling efficiency significantly affected by environmental conditions, particularly crosswinds. However, indirect air-cooled units are significantly affected by these factors during operation, particularly wind, resulting in significant fluctuations in circulating water temperature. Without effective improvements and optimization, turbine backpressure can fluctuate significantly, significantly impacting unit circulation efficiency. In severe cases, this can lead to inability to operate at full (or high) load, or even cause shutdown. Therefore, analyzing the impact of wind on indirect air cooling systems and identifying ways to improve their cooling performance have become important technical challenges urgently needed by those skilled in the art.

[0003] At present, the more common technical measures to improve the impact of ambient wind on the performance of air-cooled towers are to add guide devices or wind gathering chambers. The guide devices are more common in the form of wing walls. The device is vertically installed on the outside of the air-cooled radiator. The project is easy to implement and has a positive effect on the flow field inside and outside the air-cooled tower. However, it also increases the unevenness of the air intake on the windward and leeward sides, resulting in a limited improvement in the ventilation volume of the air-cooled tower. The addition of a wind gathering chamber mainly enhances the ventilation volume at the side and rear, better reducing the circumferential unevenness of the radiator at the bottom of the air-cooled tower. However, the improvement effect is poor at medium and low wind speeds, and the device is huge in size, requiring a large area, and the feasibility of on-site implementation is low. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an air-cooling tower flow field reconstruction system with a labyrinth-type flow guide device, which solves the technical problem of uneven ventilation volume in the existing air-cooling tower.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] An embodiment of the present invention provides an air-cooling tower flow field reconstruction system with a labyrinth-type flow guide device, comprising an air-cooling tower body, an air-cooling tower radiator and a labyrinth-type flow guide device, wherein the air-cooling tower radiator is arranged at the bottom of the air-cooling tower body, and a plurality of pairs of the labyrinth-type flow guide devices are arranged along the circumference of the air-cooling tower radiator; the labyrinth-type flow guide device comprises a cover plate, a side plate, an L-shaped back plate and a wind shield, the inner side of the cover plate is connected to the air-cooling tower body, and the outer side of the cover plate is connected to the upper end of the side plate; the lower end of the side plate is fixed to the ground, and the side plate is an arc-shaped structure with an opening facing the air-cooling tower radiator; one side of the L-shaped back plate is connected to the cover plate, and the other side of the L-shaped back plate is connected to the side plate, and the L-shaped back plate is arranged on the leeward side of the labyrinth-type flow guide device; the inner side of the wind shield is connected to the air-cooling tower radiator, the lower end of the wind shield is fixed to the ground, and the wind shield is arranged on the windward side of the labyrinth-type flow guide device.

[0009] Furthermore, a plurality of pairs of the labyrinth-type flow guide devices are symmetrically arranged around the circumference of the air-cooling tower radiator.

[0010] Furthermore, the installation height of the cover plate is greater than the upper edge height of the air cooling tower radiator.

[0011] Furthermore, the outer radius R1 of the air cooling tower radiator and the radius R2 corresponding to the outer arc of the cover plate satisfy the following relationship: 1.1R1≤R2≤1.4R1.

[0012] Furthermore, the height n of the windshield is 1.0 to 1.2 times the height of the air cooling tower radiator.

[0013] Furthermore, the width m of the windshield, the outer radius R1 of the air cooling tower radiator, and the radius R2 corresponding to the outer arc of the cover plate satisfy the following relationship: (R2-R1) / 2≤m≤R2-R1.

[0014] Furthermore, the value range of the center angle α of the cover plate is: 15°≤α≤45°.

[0015] Furthermore, the circumferential included angle β between the windshield and the L-shaped back plate and the corresponding center angle α of the cover plate satisfy the following relationship: α / 2≤β≤α.

[0016] Furthermore, the width a of the L-shaped back plate satisfies the following relationship with the outer radius R1 of the air cooling tower radiator, the radius R2 corresponding to the outer arc of the cover plate, and the width m of the wind shield: R2-R1-m≤a≤R2-R1-m / 2.

[0017] Furthermore, the height b of the L-shaped backboard and the height n of the windshield plate satisfy the following relationship: 1.1n≤b≤1.3n.

[0018] (3) Beneficial effects

[0019] The beneficial effects of the present invention are as follows: the present invention provides an air-cooling tower flow field reconstruction system with a labyrinth-type flow guide device, which reconstructs the flow field by adding a labyrinth-type flow guide device to the side flow acceleration area of ​​the original indirect air-cooling tower, thereby reducing the uneven circumferential air inlet of the cooling tower, suppressing the vortex on the inner wall, and eliminating the negative impact of ambient wind on the cooling performance of the cooling tower within the full operating wind speed range, which is beneficial to improving the safety and economy of the generator set.

[0020] The present invention utilizes the L-shaped air intake formed by the upper and outer sides of the wind shield and the inner edges of the cover plate and the side plates, which can improve the ventilation characteristics of the air-cooling tower under all working conditions, improve the heat exchange efficiency of the air-cooling tower, and reverse the negative impact of ambient wind on the cooling performance of the air-cooling tower into a positive impact.

[0021] The present invention occupies a small area and is easy to implement on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of an air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to the present invention;

[0023] Figure 2 This is a top view of an air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to the present invention;

[0024] Figure 3 Schematic diagram of the structure of the labyrinth-type flow guide device of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the windshield of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the L-shaped backboard of the present invention.

[0027] [Description of Reference Numerals]

[0028] 1. Air-cooling tower body; 2. Air-cooling tower radiator; 3. Labyrinth-type flow guide device; 31. Cover plate; 32. Side plate; 33. L-shaped back plate; 34. Wind shield. DETAILED DESCRIPTION

[0029] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below with reference to the accompanying drawings and through specific embodiments. Figure 1 The orientation is referenced.

[0030] Example 1:

[0031] Reference Figure 1 and 2, an embodiment of the present invention provides an air-cooling tower flow field reconstruction system with a labyrinth-type flow guide device. The air-cooling tower flow field reconstruction system with a labyrinth-type flow guide device includes an air-cooling tower body 1, an air-cooling tower radiator 2 and a labyrinth-type flow guide device 3. The air-cooling tower radiator 2 is arranged at the bottom of the air-cooling tower body 1, and multiple pairs of labyrinth-type flow guide devices 3 are arranged along the circumference of the air-cooling tower radiator 2. Multiple pairs of labyrinth-type flow guide devices 3 are symmetrically arranged around the circumference of the air-cooling tower radiator 2, and the center lines of the labyrinth-type flow guide devices 3 are perpendicular to the ambient transverse wind. When only one pair (two) of labyrinth-type flow guide devices 3 are provided, they should be arranged perpendicular to the local maximum frequency wind direction in summer.

[0032] Specifically, refer to Figure 3 、 Figure 4 and Figure 5 The labyrinth-type flow guide device 3 includes a cover plate 31, a side plate 32, an L-shaped back plate 33 and a wind shield 34. The inner arc of the cover plate 31 is fixedly connected to the air-cooling tower body 1, and the outer arc of the cover plate 31 is fixedly connected to the upper end of the side plate 32. The lower end of the side plate 32 is fixed to the ground, and the side plate 32 is an arc-shaped structure with an opening facing the air-cooling tower radiator 2. One side of the L-shaped back plate 33 is connected to the cover plate 31, and the other side of the L-shaped back plate 33 is connected to the side plate 32, and the L-shaped back plate 33 is arranged on the leeward side of the labyrinth-type flow guide device 3. The inner side of the wind shield 34 is connected to the air-cooling tower radiator 2, the lower end of the wind shield 34 is fixed to the ground, and the wind shield 34 is arranged on the windward side of the labyrinth-type flow guide device 3.

[0033] In actual operation of the present invention, when the ambient wind forms an accelerated airflow around the bottom side of the air-cooling tower body 1, it is first blocked by the wind shield 34, forming a stagnant high-pressure area in front of the wind shield 34. The airflow on the upper side and outside of the wind shield 34 enters the maze area behind the wind shield 34 through the L-shaped air intake formed by the outer edge of the wind shield 34 and the inner edges of the cover plate 31 and the side plate 32. Guided by the leeward side of the wind shield 34, the L-shaped back plate and the arc of the side plate 32, the airflow turns to the area of ​​the air-cooling tower radiator 2 behind the wind shield 34, thereby forming a structure that strengthens the air intake of the air-cooling tower radiator 2 behind the wind shield 34.

[0034] The installation height of the cover plate 31 of the present invention should be greater than the upper edge of the air-cooling tower radiator 2, that is, there should be a certain gap between the cover plate 31 and the upper end of the windshield 34. The windshield 34 is a louvered type, which facilitates opening and closing in different environmental conditions. The side panels 32 are preferably louvered, which facilitates opening and closing in different environmental conditions.

[0035] Specifically, the radius R1 of the outer side of the air cooling tower radiator 2 and the radius R2 corresponding to the outer arc of the cover plate 31 satisfy the following relationship: 1.1R1≤R2≤1.4R1.

[0036] Specifically, the height n of the wind shield 34 is 1.0 to 1.2 times the height of the air-cooling tower radiator 2 .

[0037] Specifically, the width m of the wind shield 34 and the outer radius R1 of the air cooling tower radiator 2 and the radius R2 corresponding to the outer arc of the cover plate 31 satisfy the following relationship: (R2-R1) / 2≤m≤R2-R1.

[0038] Specifically, the value range of the center angle α of the cover plate 31 is: 15°≤α≤45°.

[0039] Specifically, the circumferential included angle β between the windshield plate 34 and the L-shaped back plate 33 and the corresponding center angle α of the cover plate 31 satisfy the following relationship: α / 2≤β≤α.

[0040] Specifically, the width a of the L-shaped back plate 33 satisfies the following relationship with the outer radius R1 of the air cooling tower radiator 2 , the radius R2 corresponding to the outer arc of the cover plate 31 , and the width m of the wind shield 34 : R2-R1-m≤a≤R2-R1-m / 2.

[0041] Specifically, the height b of the L-shaped back plate 33 and the height n of the wind shield 34 satisfy the following relationship: 1.1n≤b≤1.3n.

[0042] The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device 3 of the present invention is described below through specific implementation cases.

[0043] For a 600MW indirect air-cooled unit, the outer diameter of the air-cooling tower radiator 2 is 152m, the height of the air-cooling tower radiator 2 is 27.5m, and the height of the air-cooling tower body 1 is 170m. Two labyrinth-shaped flow guide devices 3 are symmetrically arranged perpendicular to the main summer wind direction. The angle of the circle center corresponding to the cover plate 31 is 30°. The height of the windshield 34 is the same as that of the air-cooling tower radiator 2, and the width of the windshield 34 is 20m. The width a of the L-shaped back plate 33 is 5m, and the height b is 35m. The circumferential angle β between the windshield 34 and the L-shaped back plate 33 is 20°. The radius R2 of the arc corresponding to the outer side of the cover plate 31 is 100m. Experimental verification shows that within the wind speed range of 0 to 10 m / s, the overall ventilation volume of the flow field reconstruction system is increased by 10 to 30% compared with before the transformation. Correspondingly, within the wind speed range of 10 to 20 m / s, the overall ventilation volume is increased by 30 to 50% compared with before the transformation. In strong wind conditions (wind speed range of 10 to 20 m / s), the ventilation volume is also increased by 10 to 20% compared with the windless conditions before the transformation, turning the negative impact of ambient wind on the cooling performance of the air-cooled tower into a positive impact. Within the wind speed range of 0 to 20 m / s, the average coal consumption can be reduced by 5g / kWh.

[0044] In the description of the present invention, it should be understood that the term "plurality" means two or more than two, unless otherwise clearly defined.

[0045] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0048] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An air cooling tower flow field reconstruction system with a labyrinth-type flow guide device, characterized by: The air cooling tower comprises an air cooling tower body (1), an air cooling tower radiator (2), and a labyrinth-type flow guiding device (3), wherein the air cooling tower radiator (2) is arranged at the bottom of the air cooling tower body (1), and a plurality of pairs of the labyrinth-type flow guiding devices (3) are arranged along the circumference of the air cooling tower radiator (2), and the plurality of pairs of the labyrinth-type flow guiding devices (3) are symmetrically arranged around the circumference of the air cooling tower radiator (2); The labyrinth-type flow guide device (3) comprises a cover plate (31), a side plate (32), an L-shaped back plate (33) and a wind shield (34); the inner side of the cover plate (31) is connected to the air cooling tower body (1), and the outer side of the cover plate (31) is connected to the upper end of the side plate (32); the lower end of the side plate (32) is fixed to the ground, and the side plate (32) is an arc-shaped structure with an opening facing the air cooling tower radiator (2); the L-shaped back plate (3 3) is connected to the cover plate (31), the other side of the L-shaped back plate (33) is connected to the side plate (32), and the L-shaped back plate (33) is arranged on the leeward side of the labyrinth-type flow guide device (3); the inner side of the wind shield (34) is connected to the air cooling tower radiator (2), the lower end of the wind shield (34) is fixed to the ground, and the wind shield (34) is arranged on the windward side of the labyrinth-type flow guide device (3); The airflow enters the labyrinth area behind the wind shield (34) through the L-shaped air intake formed by the wind shield (34), the cover plate (31) and the side plate (32), and is guided by the leeward side of the wind shield (34), the L-shaped back plate (33) and the side plate (32) to the air cooling tower radiator (2) area behind the wind shield (34).

2. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The installation height of the cover plate (31) is greater than the upper edge height of the air cooling tower radiator (2).

3. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The outer radius R1 of the air cooling tower radiator (2) and the radius R2 corresponding to the outer arc of the cover plate (31) satisfy the following: 1.1R1≤R2≤1.4R1.

4. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The height n of the wind shield (34) is 1.0 to 1.2 times the height of the air cooling tower radiator (2).

5. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The width m of the windshield (34), the outer radius R1 of the air cooling tower radiator (2), and the radius R2 corresponding to the outer arc of the cover plate (31) satisfy the following relationship: (R2-R1) / 2≤m≤R2-R1.

6. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The value range of the center angle α of the cover plate (31) is: 15°≤α≤45°.

7. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The angle β of the circumferential included angle between the windshield (34) and the L-shaped back plate (33) and the corresponding center angle α of the cover plate (31) satisfy the following relationship: α / 2≤β≤α.

8. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The width a of the L-shaped back plate (33), the outer radius R1 of the air cooling tower radiator (2), the radius R2 corresponding to the outer arc of the cover plate (31), and the width m of the wind shield (34) satisfy the following relationship: R2-R1-m≤a≤R2-R1-m / 2.

9. The air cooling tower flow field reconstruction system with a labyrinth-type flow guide device according to claim 1, characterized in that: The height b of the L-shaped backboard (33) and the height n of the windshield (34) satisfy the following relationship: 1.1n≤b≤1.3n.

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