De-icing system for cooling tower air intake

Abstract

The application relates to a deicing system for the air inlet of a cooling tower, which comprises a water distribution pipe arranged on the upper side edge of the air inlet of the cooling tower. The lower side of the water distribution pipe is provided with a plurality of water spraying holes arranged in the length direction of the water distribution pipe, so as to form a water curtain covering the air inlet on the lower side of the water distribution pipe. A flushing pipe is arranged on the side away from the air inlet on the upper side of the water collecting tray, and the extending direction of the flushing pipe is the same as that of the water distribution pipe; the flushing pipe is provided with a plurality of flushing water holes in the extending direction. When external cold air passes through the water curtain, the cold air is heated by the hot water, so that the deicing effect is achieved. The water collecting tray can collect water droplets falling from the air inlet and make the water droplets flow back to the pool of the cooling tower.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, and specifically to a de-icing system for the air inlet of a cooling tower. Background Technology

[0002] In some parts of northern my country, winter temperatures are extremely cold. In the vicinity of the air inlet of cooling towers, spray water freezes rapidly after falling from the packing layer. This is particularly problematic in cooling towers constructed of fiberglass reinforced plastic (FRP), where water freezes inside the support pipes, causing them to crack. This weakens the cooling tower's frame structure and poses a risk of collapse.

[0003] In some existing technologies, manual removal of frozen ice is used, which is inefficient and poses a safety risk of falling ice fragments injuring workers. Utility Model Content

[0004] This utility model provides a de-icing system for the air inlet of a cooling tower to address the aforementioned technical problems existing in the prior art, thereby solving the technical problem of icing at the air inlet of a cooling tower in cold regions.

[0005] To achieve the above technical objectives, this utility model provides a de-icing system for a cooling tower air inlet. The cooling tower has an air inlet for receiving external cold air. The de-icing system includes: a water distribution pipe located at the upper edge of the air inlet, the length of which is adapted to the width of the air inlet; densely arranged spray holes along the length of the water distribution pipe on its lower side to form a water curtain covering the air inlet; a water receiving tray located at the lower end of the air inlet and outside the cooling tower, with the end of the water receiving tray furthest from the cooling tower higher than the end closest to the cooling tower, guiding the received water back to a water pool at the bottom of the cooling tower; the length of the water receiving tray is adapted to the width of the air inlet; and a flushing pipe located on the upper side of the water receiving tray, furthest from the air inlet, extending in the same direction as the water distribution pipe; the flushing pipe has multiple flushing holes along its extension direction.

[0006] In one possible implementation, the water outlet direction of the flushing water hole is parallel to the bottom surface of the water receiving tray.

[0007] In one possible implementation, a water supply pipe is also included, which is connected to the water distribution pipe via a first valve and to the flushing pipe via a second valve.

[0008] In one possible implementation, the spray holes are arranged in multiple rows at intervals in the inward and outward directions of the cooling tower, and each row of spray holes consists of multiple spray holes arranged at intervals along the length of the water distribution pipe.

[0009] In one possible implementation, the diameter of the spray nozzles on the side closer to the cooling tower is less than or equal to the diameter of the spray nozzles on the side farther from the cooling tower.

[0010] In one possible implementation, the diameter of the spray nozzles increases sequentially from the direction closest to the cooling tower to the direction furthest away from it.

[0011] In one possible implementation, adjacent rows of spray holes are arranged alternately along the length of the water distribution pipe.

[0012] In one possible implementation, the arrangement density of the spray holes in the inner row is greater than that in the outer row along the length of the water distribution pipe.

[0013] In one possible implementation, the water distribution pipe has a rectangular cross-section.

[0014] In one possible implementation, the water spray holes include a first water spray hole, a second water spray hole, a third water spray hole, and a fourth water spray hole arranged sequentially from the outside to the inside; the diameter of the first water spray hole is... 10~14mm; the diameter of the second spray hole is 8~12mm; the diameter of the third spray hole is 6~10mm; the diameter of the fourth spray hole is 5~9mm.

[0015] One or more technical solutions provided in this embodiment of the present invention have at least the following technical effects or advantages: The de-icing system includes a water distribution pipe located on the upper edge of the air inlet of the cooling tower. Multiple water spray holes are provided on the lower side of the water distribution pipe, arranged along the length of the pipe, thereby forming a water curtain covering the air inlet on the lower side of the pipe. When external cold air passes through the water curtain, it is heated by hot water, thus solving the icing problem and effectively de-icing when needed. A water collection tray can collect water drifting out of the air inlet and use hot water sprayed from the flushing pipe to collect the collected water into a water tank, preventing the collected water from freezing quickly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a cooling tower.

[0017] Figure 2 This is a schematic diagram of the de-icing system for the air inlet of a cooling tower according to the present invention.

[0018] Figure 3 This is a schematic diagram of the water distribution pipe structure.

[0019] Figure 4 This is a schematic diagram showing the arrangement of the spray holes on the water distribution pipe.

[0020] Figure 5 for Figure 2 A magnified view of part A in the middle.

[0021] Figure 6 for Figure 2 View B in the diagram.

[0022] Figure 7 Photograph of a water curtain forming under the water distribution pipe to cover the air inlet.

[0023] Figure 8 Comparative photographs showing the technical effects of the area where a water curtain is formed and the area where no water curtain is formed.

[0024] Explanation of reference numerals in the attached figures

[0025] 10. Tower body; 11. Air inlet; 12. Packing layer; 13. Spray layer; 14. Exhaust outlet; 15. Blades; 16. Water tank;

[0026] 20. De-icing system; 21. Water distribution pipe; 210. Water spray nozzle; 211. First water spray nozzle; 212. Second water spray nozzle; 213. Third water spray nozzle; 214. Fourth water spray nozzle;

[0027] 22. Water supply pipe; 23. First valve; 24. Branch pipe; 25. Second valve; 26. Flushing pipe; 261. Flushing water hole; 27. Water receiving tray; 271. Water baffle.

[0028] 100. Water curtain; 200. Icicles; Detailed Implementation

[0029] Other objects and advantages of this utility model will become clear by explaining the preferred embodiments of the present application below.

[0030] For clarity, directions are defined in the coordinate system of the attached figure. In the figure, "outside" refers to the direction located outside the cooling tower or away from the cooling tower; "right" is the right side of the air inlet 11 in the width direction when viewed directly; opposite to the above directions, "inside" refers to the direction located inside the cooling tower or close to the cooling tower; "left" is the left side of the air inlet 11 in the width direction when viewed directly.

[0031] Figure 1 This is a schematic diagram of a cooling tower. Figure 1As shown, the cooling tower includes a tower body 10, an air inlet 11 located at the bottom of the tower body 10, and an air outlet 14 located at the top of the tower body 10. Inside the tower body 10, a packing layer 12 and a spray layer 13 are arranged sequentially from bottom to top between the air inlet 11 and the air outlet 14. The air outlet 14 is provided with rotatable blades 15. When the blades 15 rotate, under the attraction force they generate, external cold air passes sequentially through the air inlet 11, the packing layer 12, and the spray layer 13, and is discharged through the air outlet 14.

[0032] The spray layer 13 is equipped with nozzles. Hot water is sprayed out from the nozzles and flows through the packing layer 12, where it exchanges heat with the cold air entering the tower. It then falls into the water pool 16 at the bottom of the cooling tower and is collected there.

[0033] Figure 2 This is a schematic diagram of the de-icing system 20 for the air inlet of a cooling tower according to the present invention. Figure 6 for Figure 2 View B in the diagram. For example... Figure 2 As shown, the de-icing system 20 includes a water distribution pipe 21 located on the upper edge of the air inlet 11 of the cooling tower body 10. The water distribution pipe 21 extends in the width direction of the air inlet 11. Figure 2 The direction perpendicular to the paper surface, Figure 6 (In the left-right direction), the length of the water distribution pipe 21 is adapted to the width of the air inlet 11. Preferably, as shown in the example... Figure 6 As shown, the length of the water distribution pipe 21 is the same as the width of the air inlet 11. Multiple water spray holes 210 are provided on the lower side of the water distribution pipe 21, arranged along the length of the pipe, thus forming a water curtain 100 covering the air inlet 11 on the lower side of the pipe 21. When external cold air passes through the water curtain 100, it is heated by the hot water, thereby solving the aforementioned icing problem.

[0034] Furthermore, the water supply pipe 22 is connected to the water distribution pipe 21 for supplying hot water to the water supply pipe 22. In some embodiments, a first valve 23 is installed on the water supply pipe 22, which is opened when de-icing is required; when the outside temperature rises and de-icing is not required, the first valve 23 can be closed.

[0035] Figure 3 This is a schematic diagram of the water distribution pipe 21. Figure 4 This is a schematic diagram showing the arrangement of the spray holes 210 on the water distribution pipe 21.

[0036] like Figure 3 and Figure 4 As shown, in this embodiment, the water distribution pipe 21 has a rectangular cross-section, and a spray hole 210 is provided on the lower end face of the water distribution pipe 21. The spray hole 210 is located along the length of the water distribution pipe 21 ( Figure 6Arranged in a left-right direction, the hot water in the water distribution pipe 21 is sprayed out through the spray hole 210 to form a water curtain covering the air inlet 11. The cross-sectional shape of the water distribution pipe 21 can be other regular or irregular shapes.

[0037] Preferably, the aforementioned water spray holes 210 are arranged in multiple rows at intervals in the inward and outward directions. For example... Figure 3 As shown, the water spray hole 210 includes a first water spray hole 211, a second water spray hole 212, a third water spray hole 213, and a fourth water spray hole 214. The first water spray hole 211, the second water spray hole 212, the third water spray hole 213, and the fourth water spray hole 214 are all arranged in multiples along the length of the water distribution pipe 21.

[0038] The diameter of the inner water spray hole 210 is less than or equal to the diameter of the outer water spray hole 210. For example, in some embodiments, the diameters of the first water spray hole 211, the second water spray hole 212, the third water spray hole 213, and the fourth water spray hole 214 gradually decrease from the outside to the inside. When external cold air passes through the air inlet 11, it first comes into contact with the water flow sprayed from the first water spray hole 211. The water flow from the first water spray hole 211 is relatively large and is not easily frozen. As the cold air passes sequentially through the water curtain sprayed from each row of water spray holes 210, the temperature gradually increases. Therefore, the diameter of the inner water spray hole 210 gradually decreases, and the sprayed water flow will not freeze.

[0039] In some embodiments, the diameter of the first spray hole is 10~14mm; the diameter of the second spray hole is 8~12mm; the diameter of the third spray hole is 6~10mm; the diameter of the fourth spray hole is 5~9mm. Testing has shown that these parameters provide good de-icing performance.

[0040] Along the length of the water distribution pipe 21, adjacent rows of spray holes 210 are arranged in an alternating pattern, increasing the contact area between the cold air and the water curtain, which is more conducive to rapidly heating the cold air. For example, as Figure 4 As shown, the first water spray hole 211 and the second water spray hole 212 are arranged alternately along the length of the water distribution pipe 21, and the third water spray hole 213 and the second water spray hole 212 are arranged alternately along the length of the water distribution pipe 21.

[0041] Along the length of the water distribution pipe 21, the arrangement density of the inner spray holes 210 is greater than that of the outer spray holes 210, which increases the contact area between the cold air and the water curtain while ensuring that the air does not freeze. Along the length of the water distribution pipe 21, the arrangement density of the third spray hole 213 is greater than that of the second spray hole 212.

[0042] In one embodiment, a nozzle with an adjustable spray direction is installed on at least a portion of the spray holes 210, thereby enabling the spray direction of the nozzle to be adjusted as needed.

[0043]

Water Tray 27

[0044] Due to external airflow (such as wind), water falling from the packing layer 12 inside the cooling tower will drift to the outside of the air inlet 11, causing ice to form in the adjacent area outside the air inlet 11. To solve this problem, the present invention further includes a water receiving tray 27.

[0045] like Figure 2 and Figure 5 As shown, the water receiving tray 27 is located at the lower end of the air inlet 11 and outside the cooling tower. The end of the water receiving tray 27 away from the air inlet 11 is higher than the end near the air inlet 11, so that water falling onto the water receiving tray 27 can flow back to the water pool 16. To prevent the water in the water receiving tray 27 from freezing, this invention further provides a flushing pipe 26, which is located on the upper side of the water receiving tray 27 and on the side away from the air inlet 11. The flushing pipe 26 runs along... Figure 6 Extending in the left-right direction, preferably parallel to the water distribution pipe 21, its length is adapted to the length of the outer end of the water receiving tray 27. Multiple flushing water holes 261 are provided on the flushing pipe 26 in its extending direction. Hot water discharged through the flushing water holes 261 flushes the water receiving tray 27, which can effectively prevent ice formation inside the water receiving tray 27.

[0046] The flushing pipe 26 can be connected to the water supply pipe 22 through the branch pipe 24. A second valve 25 can also be installed on the branch pipe 24 to control the working state of the flushing pipe 26. The second valve 25 can be opened when de-icing is needed and closed when de-icing is not needed.

[0047] Preferably, the water jet direction at the rinsing water hole 261 is parallel to the plane containing the bottom surface of the water receiving tray 27, thereby effectively rinsing the water receiving tray 27. Furthermore, a baffle plate 271 is provided at the outer end of the water receiving tray 27. The lower end of the baffle plate 271 is fixed to the outer edge of the water receiving tray 27, and the upper end extends upwards. By providing the baffle plate 271, water inside the water receiving tray 27 can be prevented from splashing out.

[0048] [Experimental Verification]

[0049] Figure 7 The image shows a water curtain 100 formed on the lower side of the water distribution pipe 21, which covers the air inlet 11. This water curtain 100 can preheat the cold air entering the cooling tower.

[0050] Figure 8 The illustration visually demonstrates the significant effectiveness of the water curtain 100 in preventing and removing ice. Figure 8 In the middle section where no water curtain is formed, ice crystals 200 form at the air inlet 11 and on nearby internal components, while no icing occurs in the section where a water curtain is formed.

[0051] In addition, it should be noted that in the practical application of cooling towers in cold regions, icing at the air inlet 11 is a technical problem that those skilled in the art have long sought to solve but have been unable to solve. The technical solution of this utility model successfully solved this technical problem by setting a water curtain at the air inlet 11, achieving unexpected technical results.

[0052] The apparatus of this application has been described in detail with reference to the preferred technical solutions. However, it should be noted that, without departing from the spirit of this application, those skilled in the art can make any modifications, alterations, and variations based on the above disclosure. This application includes the above-described specific embodiments and any equivalent forms thereof.

Claims

1. A de-icing system for the air inlet of a cooling tower, the cooling tower having an air inlet (11) for the inflow of external cold air, characterized in that, The de-icing system (20) has: A water distribution pipe (21) is located on the upper edge of the air inlet (11), the length of which is adapted to the width of the air inlet (11); the lower side of the water distribution pipe (21) is provided with densely arranged water spray holes (210) along the length of the water distribution pipe (21) to form a water curtain (100) covering the air inlet (11) on the lower side of the water distribution pipe (21). A water receiving tray (27) is provided at the lower end of the air inlet (11) and outside the cooling tower. The end of the water receiving tray (27) away from the cooling tower is higher than the end near the cooling tower, guiding the received water back to the water pool (16) at the bottom of the cooling tower. The length of the water receiving tray (27) is adapted to the width of the air inlet (11). On the upper side of the water receiving tray (27), a flushing pipe (26) is provided on the side away from the air inlet (11). The extension direction of the flushing pipe (26) is the same as the extension direction of the water distribution pipe (21). The flushing pipe (26) has a plurality of flushing water holes (261) in its extension direction.

2. The de-icing system for the air inlet of a cooling tower as described in claim 1, characterized in that, The water outlet direction of the flushing water hole (261) is parallel to the bottom surface of the water receiving tray (27).

3. The de-icing system for the air inlet of a cooling tower as described in claim 1, characterized in that, It also includes water supply pipes (22). The water supply pipe (22) is connected to the water distribution pipe (21) through the first valve (23) and to the flushing pipe (26) through the second valve (25).

4. The de-icing system for the air inlet of a cooling tower as described in claim 1, characterized in that, The water spray holes (210) are arranged in multiple rows at intervals in the inner and outer directions of the cooling tower. Each row of spray holes (210) consists of multiple holes spaced apart along the length of the water distribution pipe (21).

5. The de-icing system for the air inlet of a cooling tower as described in claim 4, characterized in that, The diameter of the spray hole (210) on the side closer to the cooling tower is less than or equal to the diameter of the spray hole (210) on the side farther away from the cooling tower.

6. The de-icing system for a cooling tower air inlet as described in claim 4, characterized in that, The diameter of the spray nozzles (210) increases sequentially from the direction closest to the cooling tower to the direction furthest away from it.

7. The de-icing system for the air inlet of a cooling tower as described in claim 1, characterized in that, Along the length of the water distribution pipe (21), two adjacent rows of spray holes (210) are arranged alternately.

8. The de-icing system for a cooling tower air inlet as described in claim 4, characterized in that, Along the length of the water distribution pipe (21), the arrangement density of the spray holes (210) located in the inner row is greater than that of the spray holes (210) located in the outer row.

9. The de-icing system for a cooling tower air inlet as described in claim 1, characterized in that, The water distribution pipe (21) has a rectangular cross-section.

10. The de-icing system for a cooling tower air inlet as described in claim 1, characterized in that, The water spray hole (210) includes a first water spray hole (211), a second water spray hole (212), a third water spray hole (213) and a fourth water spray hole arranged sequentially from the outside to the inside; The diameter of the first water spraying hole (211) is 10-14 mm. 10~14mm; The diameter of the second water spraying hole (212) is 8-12mm; The diameter of the third water spraying hole (213) is 6-10mm. 6~10mm; The diameter of the fourth water spray hole (214) is 5~9mm.

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