A wet cooling tower with meniscus-shaped filler and its application

Abstract

The present invention relates to the technical field of cooling towers, and in particular to a wet cooling tower with a meniscus-shaped filler and its application. It comprises: a tower, a central shaft and a curved filler area; the central shaft is located at the center of the tower, the filler area is located between the tower and the central shaft, and the filler area is divided into a "meniscus-shaped" filler area and a filler area outside the "meniscus"; the thickness of the "meniscus-shaped" filler area is greater than the thickness of the filler area outside the "meniscus"; the "meniscus-shaped" filler area is located in the "meniscus-shaped" high water temperature area caused by the side wind. The present invention is aimed at the operating conditions of the cooling tower under the side wind, takes into account the "meniscus" performance deterioration area caused by the two factors of the cooling tower's own structure and the external side wind, and proposes a technical concept of "meniscus" non-equal height arrangement of fillers. The air-water contact time of the "meniscus-shaped" filler area of ​​the cooling tower using the present invention becomes longer, the circulating water temperature drop in this area is increased, and the cooling performance is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of cooling towers, in particular to a wet cooling tower with a meniscus-shaped filler and application thereof. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Natural ventilation countercurrent wet cooling towers are widely used in the power industry in my country. The basic principle is: hot water is sent to the hot water distribution system through pipes through vertical pipes (shafts), and then the water is sprinkled on the filler through the splashing equipment; after passing through the filler, it falls into the reservoir in the form of rain, and the cooled water is pumped away for reuse. The bottom of the tower is the air inlet, and the air enters the tower body from the air inlet, passes through the rain area under the filler, and flows through the filler in the opposite direction to the hot water flow (hence the name countercurrent type), and then is discharged from the tower outlet after the water droplets in the air are recovered by the water collector. After the cold air outside the tower enters the cooling tower, it absorbs the heat lost by the evaporation of hot water and contact, the temperature increases, the humidity increases, and the density decreases. Due to the difference in air density inside and outside the tower, a pressure difference is generated inside and outside the air inlet, causing the air outside the tower to flow into the tower continuously without the need for ventilation machinery to provide power, which is natural ventilation.

[0004] During the operation of the natural ventilation countercurrent wet cooling tower, air enters the cooling tower from the bottom air inlet, and circulating water falls from the water distribution area of ​​the cooling tower. The air and circulating water complete the heat and mass transfer process in the water distribution area, the filling area and the rain area. Due to the structure of the cooling tower itself, under windless conditions, the air flow rate continues to decrease along the radial direction of the cooling tower, resulting in a continuous decrease in the performance of the cooling tower along the radial direction, and a heat transfer deterioration zone is formed inside the cooling tower. Patent document CN 102607324 A discloses "a new arrangement method for wet cooling tower packing", which is a method of non-equal height arrangement of packing along the diameter direction of the wet cooling tower. The packing is the thinnest at the center of the wet cooling tower, the packing height of the outer edge of the tower is second, and the packing is the thickest within a certain diameter range in the middle, so that the heat and mass transfer performance of each part of the tower can be uniform, and the cooling efficiency of the cooling tower can be improved. Summary of the invention

[0005] The method in the above patent document does not optimize the aerodynamic field in the tower under the crosswind environment. However, the present invention finds that when there is an external crosswind, the aerodynamic field inside the cooling tower becomes more complicated, and the performance of various parts of the cooling tower becomes more uneven, especially a "meniscus-shaped" high water temperature area will form on the surface of the water collection tank, that is, the cooling tower performance deterioration area turns into a "meniscus". To this end, the present invention provides a wet cooling tower with a meniscus-shaped filler to solve the cooling problem caused by the "meniscus-shaped" performance deterioration area in the cooling tower under the crosswind environment.

[0006] The first object of the present invention is to provide a wet cooling tower with meniscus-shaped filler.

[0007] The second purpose of the present invention is to provide an application of the wet cooling tower with meniscus-shaped filler.

[0008] In order to achieve the above-mentioned invention object, the present invention discloses the following technical solutions:

[0009] Firstly, the present invention discloses a wet cooling tower with a meniscus-shaped filler, comprising: a tower, a central shaft and a curved filler area; the central shaft is located at the center of the tower, the filler area is located between the tower and the central shaft, and the filler area is divided into a "meniscus-shaped" filler area and a filler area outside the "meniscus"; the thickness of the "meniscus-shaped" filler area is greater than the thickness of the filler area outside the "meniscus"; the "meniscus-shaped" filler area is located in the "meniscus" high water temperature area caused by side wind.

[0010] As a further technical solution, the position and geometric dimensions of the "crescent-shaped" filling area are related to the direction and speed of the external side wind, and can generally be determined according to the annual wind speed and direction in the area where the cooling tower is located or the wind speed and direction corresponding to the worst working conditions.

[0011] As a further technical solution, the thickness relationship between the "meniscus-shaped" filling area and the filling area outside the "meniscus" is: 1.2-1.3 times.

[0012] As a further technical solution, the "crescent-shaped" filling area is located in the following area: with the central vertical shaft as the center and the crosswind direction as the symmetry axis, two extension lines are formed along the left and right sides of the symmetry axis and extend toward the periphery of the central vertical shaft at an angle θ with the symmetry axis, and the endpoints of the two extension lines are connected by curves; the endpoint is the end farthest from the central vertical shaft, and there are two curves distributed on the front and rear sides of the two extension lines, thereby forming a "crescent-shaped" filling area, and the angle θ is an acute angle.

[0013] As a further technical solution, when the crosswind speed is 4-6 m / s, the length of the extension line L=45-50 m, θ=75-80°, and L is the projection length of the extension line on the horizontal axis.

[0014] As a further technical solution, when the crosswind speed is 4 m / s, the length of the extension line L=45 m, θ=80°, and L is the projection length of the extension line on the horizontal axis.

[0015] As a further technical solution, when the crosswind speed is 6 m / s, the length of the extension line L=50 m, θ=75°, and L is the projection length of the extension line on the horizontal axis.

[0016] Finally, the present invention discloses the application of the wet cooling tower with meniscus-shaped filler in industrial production and refrigeration process.

[0017] Compared with the prior art, the present invention has achieved the following beneficial effects: the present invention aims at the operating conditions of the cooling tower under crosswind, takes into account the "meniscus" performance deterioration zone caused by the cooling tower structure itself and the external crosswind, and proposes a technical concept of "meniscus" non-equal height arrangement of fillers. The air-water contact time of the "meniscus" filler area of ​​the cooling tower using the present invention becomes longer, the circulating water temperature drop in this area is increased, and the cooling performance is enhanced. At the same time, the air temperature rise in this area increases, the air density decreases, and the suction force increases. The increase in the thickness of the filler in this area will increase the resistance of air flow. Therefore, the aerodynamic field of the entire cooling tower does not change significantly, thereby strengthening the overall cooling performance of the cooling tower without affecting the heat and mass transfer in other areas, and improving the circulating water temperature drop. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 1 is a top view of a wet cooling tower with a meniscus-shaped filler according to Example 1 of the present invention.

[0020] Figure 2 This is a schematic structural diagram of a wet cooling tower with meniscus-shaped filler according to Example 1 of the present invention.

[0021] The symbols in the above drawings represent: 1-tower, 2-central shaft, 3-"menus-shaped" filling area, 4-filling area outside the "menus-shaped", 5-symmetry axis. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] As mentioned above, when there is external side wind, the aerodynamic field inside the cooling tower is more complicated, and the performance of various parts of the cooling tower is more uneven, especially a "meniscus-shaped" high water temperature area will be formed on the surface of the water collection tank, that is, the cooling tower performance deterioration area is transformed into a "meniscus". Therefore, the present invention proposes a wet cooling tower with a meniscus-shaped filler; the present invention is further described in conjunction with the accompanying drawings and specific embodiments.

[0025] refer to Figure 1 and 2 A wet cooling tower with a meniscus-shaped filler comprises: a tower 1, a central shaft 2 and a curved filler area; the central shaft 2 is located at the center of the tower 1, the filler area is located between the tower 1 and the central shaft 2, and the filler area is divided into a "meniscus-shaped" filler area 3 and a filler area 4 outside the "meniscus"; the thickness of the "meniscus-shaped" filler area is 1.3 times the thickness of the filler area 4 outside the "meniscus"; the "meniscus-shaped" filler area 3 is located in the "meniscus" high water temperature area caused by side wind.

[0026] Example 2

[0027] A wet cooling tower with a meniscus-shaped filler, the same as in Example 1, except that the meniscus-shaped filler area 3 is located in the following area: with the central shaft 2 as the center and the side wind direction ( Figure 1 The symmetry axis 5 is shown as the middle arrow, and two extension lines are formed along the left and right sides of the symmetry axis and extend toward the periphery of the central vertical shaft 2 at an angle θ with the symmetry axis, and the endpoints of the two extension lines are connected by a curve; the endpoint is the end away from the central vertical shaft 2, and there are two curves, which are distributed on the front and rear sides of the two extension lines, thereby forming a "crescent-shaped" filling area 3, and the angle θ is an acute angle; and the thickness of the "crescent-shaped" filling area is 1.2 times the thickness of the filling area 4 outside the "crescent-shaped".

[0028] Example 3

[0029] A wet cooling tower with a meniscus-shaped filler, same as Example 2, except that: a certain watering area is 5500m 2 The cooling tower is located in an area with an annual wind speed of 4m / s and an annual wind direction of south wind. When the "crescent-shaped" filler is arranged at a non-equal height for the cooling tower, the filler thickness in the crescent-shaped performance deterioration area increases, the time for the circulating water to flow through the filler area becomes longer, and the contact time between the air and the circulating water increases, thereby strengthening the heat and mass transfer between air and water in the area. Under the annual wind direction and wind speed, the position of the "crescent-shaped" filler area 3 of the cooling tower is: the length of the extension line L = 45m, the angle θ = 80°, and L is the projection length of the extension line on the horizontal axis.

[0030] Example 4

[0031] A wet cooling tower with a meniscus-shaped filler is the same as Example 3, except that the worst working condition in the area where the cooling tower is located corresponds to a southerly wind with a wind speed of 6 m / s. At this time, the position of the "meniscus-shaped" filler area 3 is as follows: the length of the extension line L = 50 m, and the angle θ = 75°.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wet cooling tower with meniscus-shaped filler, characterized in that: include: The tower, the central shaft and the curved filling area; the central shaft is located at the center of the tower, the filling area is located between the tower and the central shaft, and the filling area is divided into a "meniscus" filling area and a filling area outside the "meniscus"; the thickness of the "meniscus" filling area is greater than the thickness of the filling area outside the "meniscus"; the "meniscus" filling area is located in the "meniscus" high water temperature area caused by the crosswind; The "crescent-shaped" filling area is located in the following area: with the central shaft as the center and the crosswind direction as the symmetry axis, two extension lines are formed along the left and right sides of the symmetry axis and extend to the periphery of the central shaft at an angle θ with the symmetry axis. The two extension lines are symmetrically arranged along the symmetry axis, and the endpoints of the two extension lines are connected by a curve; the endpoint is the end away from the central shaft; there are two curves, which are distributed on the front and rear sides of the two extension lines, thereby forming a "crescent-shaped" filling area; The thickness relationship between the "meniscus" filling area and the filling area outside the "meniscus" is: 1.2 times - 1.3 times; The angle θ is an acute angle.

2. A wet cooling tower with meniscus filler according to claim 1, characterized in that: When the crosswind speed is 4-6 m / s, the length of the extension line L=45~50 m, θ=75~80°, and L is the projection length of the extension line on the horizontal axis.

3. The wet cooling tower with meniscus filler according to claim 1, characterized in that: When the crosswind speed is 4 m / s, the length of the extension line is L=45 m, θ=80°, and L is the projection length of the extension line on the horizontal axis.

4. The wet cooling tower with meniscus filler according to claim 1, characterized in that: When the crosswind speed is 6 m / s, the length of the extension line is L=50 m, θ=75°, and L is the projection length of the extension line on the horizontal axis.

5. The wet cooling tower with meniscus filler according to claim 1, characterized in that: Application in industrial production and refrigeration technology.

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