Natural ventilation wet cooling tower coupling rain area drifting inhibition and air inlet flow field optimization

Abstract

A natural ventilation wet cooling tower coupling rain area drifting inhibition and air inlet flow field optimization comprises a cooling tower and a rain area drifting inhibition device. The rain area drifting restraining device comprises a circumferential air control device and a top air control device, wherein the circumferential air control device is formed by air control anti-drifting plates which are vertically arranged on the air section on the periphery of the tower on the outer side of the air inlet. Through the synergistic effect of the rain area drifting restraining device, circumferential cross ventilation of the side wind area of the cooling tower is turned into the tower, so that the situation that environment wind blows rain area drifting drifts of the side wind area of the cooling tower out of the air inlet is restrained, the wind blowing loss of the rain area is reduced, and the radial effective air inlet amount of the cooling tower is increased. The air control anti-floating plates are further provided with ventilation vortex eliminating areas, transverse vortexes in a flow channel between the two air control anti-floating plates can be reduced, and therefore the air inlet resistance is reduced, and the radial effective air inlet amount is further increased. The top air control device is of an annular anti-floating flow guide flat plate structure surrounding the tower by one circle, and floating drops above the air inlet can be prevented from losing. Furthermore, a non-crosswind section rain area drifting inhibition device can be included to adapt to the change of the environmental wind direction.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling towers, and in particular relates to a natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization. Background Art

[0002] As the main cold-end equipment of the power plant, the natural ventilation wet cooling tower has a significant impact on the operating status of the entire unit. During the operation of the tower, the cooling water is in direct contact with the air, and due to the influence of the environmental side wind, there will be a phenomenon of floating drops at the air inlet of the cooling tower, which will blow out the cooling water droplets falling in the rain area and fall on the outside of the water collection tank, causing the loss of cooling water, thereby reducing the cooling performance of the cooling tower; at the same time, due to various dosing treatments of the cooling water during the operation of the cooling tower, it has a certain degree of corrosiveness, causing pollution to the land around the tower; when the cooling water is seawater, the salt content of the seawater is too high, causing salinization and other phenomena at the place where the floating drops fall in the rain area. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, a natural ventilation wet cooling tower which couples rain drop suppression and air inlet flow field optimization is provided.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a naturally ventilated wet cooling tower that couples rain zone droplet suppression and inlet flow field optimization, including a cooling tower and a rain zone droplet suppression device, characterized in that: the cooling tower is a naturally ventilated wet cooling tower, including a tower body, an air inlet, filler, a rain zone and a water collection tank; the rain zone droplet suppression device includes a circumferential wind control device and a top wind control device, which are arranged in the side wind section around the tower outside the air inlet; when the ambient wind blows through the side wind area of ​​the cooling tower, the circumferential through-wind in the side wind area of ​​the cooling tower is turned into the tower through the synergistic effect of the rain zone droplet suppression device, thereby suppressing the ambient wind from blowing droplets in the rain zone of the side wind area of ​​the cooling tower out of the air inlet, reducing the wind blowing loss in the rain zone, and increasing the radial effective air intake of the cooling tower.

[0005] The tower body of the natural ventilation wet cooling tower is a hyperbolic structure; the air inlet is between the lowest part of the hyperbolic structure of the tower body and the water collecting tank; the filler is located inside the tower body, a certain distance above the air inlet; the rain zone is located directly below the filler and directly above the water collecting tank, and the area inside the air inlet is a vacant area or has a cross windbreak wall therein, and the radius of the rain zone is Ry; the water collecting tank is located directly below the rain zone, and the radius of the water collecting tank is Rs.

[0006] The height of the circumferential wind control device is H, and the height of the cooling tower air inlet is Hj; the height of the circumferential wind control device is H .

[0007] The inner and outer spacing of the wind control and anti-drift plates along the tower radial direction is Wd, and 0.5m ≤ Wd ≤ 6.0m.

[0008] The drift distance of the raindrops in the rain area under the design ambient wind speed vs of the cooling tower is Lpd, which is the product of the falling time t of the raindrops in the rain area and the design ambient wind speed vs; the adjacent spacing of the wind control and anti-drift plates is Kd. When the design ambient wind speed vs≥5m / s, .

[0009] The structure of the wind control and anti-drift plate is a flat plate structure, which can turn the circumferential through-wind in the side wind area of ​​the cooling tower into the tower.

[0010] Furthermore, the structure of the wind control and anti-drift plate can also be one or more of a flat plate, a corrugated plate or an arc plate structure, and can be arranged and combined in layers vertically, radially or in any direction.

[0011] Furthermore, the wind control and anti-drift plate may also be provided with a ventilation and vortex elimination area; the ventilation and vortex elimination area is ventilation-permeable and effectively reduces the lateral vortex in the flow channel, reduces the wind intake resistance, increases the radial air intake volume of the cooling tower, and optimizes the uniformity and stability of the wind intake flow field; the ventilation and vortex elimination area is arranged on the wind control and anti-drift plate, and its opening rate is 0% ≤ η ≤100%.

[0012] The top wind control device has an outer end overlapped with the top of the circumferential wind control device, and an inner end connected to the outer wall of the tower body, and is an annular flat plate structure arranged around the tower; the inner end of the top wind control device is .

[0013] Furthermore, the rain area droplet suppression device can also be arranged in the non-side wind section around the cooling tower air inlet to adapt to changes in ambient wind direction.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the rain zone droplet suppression device includes a circumferential wind control device and a top wind control device composed of wind control and anti-drift plates. When the ambient side wind flows through the rain zone droplet suppression device, the flow direction of the ambient side wind is changed from side wind to along the radial direction of the cooling tower, thereby reducing the direct effect of the ambient side wind on the rain zone and suppressing the amount of droplets in the rain zone; further, the wind control and anti-drift plates are provided with a ventilation and vortex elimination area, which can reduce the lateral vortex in the flow channel between the two wind control and anti-drift plates, thereby reducing the wind intake resistance, increasing the effective air intake along the radial direction of the cooling tower, further suppressing droplets in the rain zone, and optimizing the uniformity and stability of the air intake flow field; and reducing the windblown loss of cooling water and the pollution of the land around the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The schematic diagram of the layout of a rain area droplet suppression device for a naturally ventilated wet cooling tower coupled with rain area droplet suppression and inlet flow field optimization is shown.

[0016] Figure 2 Schematic diagram of the wind control and anti-drift plate of the rain area droplet suppression device.

[0017] Figure 3 It is a schematic diagram of the air flow field in the wind control and anti-drift plate flow channel with an integral flat plate structure and an integral arc structure having a ventilation and vortex elimination area.

[0018] Figure 4 It is a schematic diagram of the air flow field in the wind control and anti-drift plate flow channel provided with a flat plate and curved plate combination structure and a flat plate and corrugated plate combination structure with air-permeable and vortex-eliminating areas.

[0019] Figure 5 It is a schematic diagram of the air flow field in the wind control and anti-drift plate flow channel provided with a combined structure of an arc plate and a corrugated plate and a combined structure of a corrugated plate and a flat plate in a ventilation and vortex elimination area.

[0020] Figure 6 Schematic diagram of the ventilation and vortex elimination area.

[0021] In the figure: 1-cooling tower; 2-wind control and anti-drift board; 3-air inlet; 4-rain area; 5-ventilation and vortex elimination area; 6-top wind control device; 7-filler; 8-water collection pool wall; 9-rain area range boundary. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0023] like Figures 1 to 5 As shown, a naturally ventilated wet cooling tower that couples rain zone droplet suppression and inlet flow field optimization includes a cooling tower 1 and a rain zone droplet suppression device, and is characterized in that: the cooling tower 1 is a naturally ventilated wet cooling tower, including a tower body, an air inlet 3 and a rain zone 4; the rain zone droplet suppression device includes a circumferential wind control device and a top wind control device 6; the circumferential wind control device is a wind control and anti-drift plate 2 vertically arranged in the side wind section around the tower outside the air inlet, and is composed of 52 wind control and anti-drift plates 2; when the ambient wind blows through the side wind area of ​​the cooling tower 1, the circumferential through-wind in the side wind area of ​​the cooling tower 1 is turned into the tower through the synergistic effect of the rain zone droplet suppression device, thereby suppressing the ambient wind from blowing the droplets in the rain zone of the side wind area of ​​the cooling tower 1 out of the air inlet, reducing the wind blowing loss in the rain zone, and increasing the radial effective air intake of the cooling tower 1.

[0024] The tower body of the natural ventilation wet cooling tower 1 is a hyperbolic structure; the rain zone 1 is located in the area directly below the filler 7 in the tower body and inside the air inlet 3, and the rain zone radius Ry=41m; the water collection tank is located directly below the rain zone, and the water collection tank radius Rs=42m.

[0025] The height of the circumferential wind control device is H=8.4m, and the height of the cooling tower air inlet is Hj=7.5m; the height of the circumferential wind control device is greater than the height of the cooling tower air inlet; the wind control and anti-drift plates 2 are arranged in two layers in the height direction, and the height of each layer of the wind control and anti-drift plates 2 is 4.2m.

[0026] The wind control and anti-drift plate 2 is a flat plate, a corrugated plate or an arc plate structure or more, and is arranged and combined in layers in the vertical, radial or arbitrary directions. Figures 3-5 As shown in the examples, the wind control and anti-drift plate 2 is an integral flat plate structure, an integral arc structure, a combination structure of a flat plate and an arc plate, a combination structure of a flat plate and a corrugated plate, and a combination structure of an arc plate and a corrugated plate.

[0027] The wind control and anti-drift plate 2 in this embodiment is a combination structure of a flat plate and an arc-shaped plate. The design environmental wind speed is 5m / s, the falling time of rain droplets in the rain area is 2s, the radial inner and outer spacing of the wind control and anti-drift plates 2 along the tower is Wd=2.4m, and the spacing between the two wind control and anti-drift plates 2 ranges from 1.0m≤Kd≤9.8m, and Kd=5.0m is taken.

[0028] like Figure 1 , 6 As shown, the ventilation and vortex elimination area 5 is arranged on the wind control and anti-drift plate 2, and the opening rate η of the ventilation and vortex elimination area is 100%.

[0029] It further includes a top wind control device 6; the top wind control device 6 has an outer end overlapped with the top of the circumferential wind control device, and an inner end connected to the outer wall of the tower body, which is an annular flat plate structure arranged around the tower; and the height of the inner end of the top wind control device 6 is Hn=9.2m.

[0030] It also includes a rain area droplet suppression device arranged in the non-side wind section around the cooling tower 1 at the air inlet 3, which is composed of a circumferential wind control device and a top wind control device 6; the overall layout is the same as the rain area droplet suppression device in the side wind section to adapt to changes in environmental wind direction.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary implementation cases, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the implementation cases should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0032] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization, comprising a cooling tower and a rain area droplet suppression device, characterized in that: The cooling tower is a naturally ventilated wet cooling tower, comprising a tower body, an air inlet, fillers, a rain zone and a water collection tank; the rain zone droplet suppression device comprises a circumferential wind control device and a top wind control device, which are arranged in the side wind section around the tower outside the air inlet; when the ambient wind blows through the side wind area of ​​the cooling tower, the circumferential through-wind in the side wind area of ​​the cooling tower is turned into the tower through the synergistic effect of the rain zone droplet suppression device, thereby suppressing the ambient wind from blowing droplets in the rain zone of the side wind area of ​​the cooling tower out of the air inlet, reducing wind blowing losses in the rain zone, and increasing the effective radial air intake of the cooling tower.

2. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 1, characterized in that: The tower body of the natural ventilation wet cooling tower is a hyperbolic structure; the air inlet is between the lowest part of the hyperbolic structure of the tower body and the water collecting tank; the filler is located inside the tower body, a certain distance above the air inlet; the rain zone is located directly below the filler and directly above the water collecting tank, and the area inside the air inlet is a vacant area or a cross windbreak wall is set therein, and the radius of the rain zone is Ry; the water collecting tank is located directly below the rain zone, and the radius of the water collecting tank is Rs.

3. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 2, characterized in that: The height of the circumferential wind control device is H, and the height of the cooling tower air inlet is Hj; the height of the circumferential wind control device is H .

4. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 3, characterized in that: The inner and outer spacing of the wind control and anti-drift plates along the tower radial direction is Wd, and 0.5m ≤ Wd ≤ 6.0m.

5. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 4, characterized in that: The drift distance of the raindrops in the rain area under the design ambient wind speed vs of the cooling tower is Lpd, which is the product of the falling time t of the raindrops in the rain area and the design ambient wind speed vs; the adjacent spacing of the wind control and anti-drift plates is Kd. When the design ambient wind speed vs≥5m / s, .

6. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 5, characterized in that: The structure of the wind control and anti-drift plate is a flat plate structure, which can turn the circumferential through-wind in the side wind area of ​​the cooling tower into the tower.

7. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 6, characterized in that: Furthermore, the structure of the wind control and anti-drift plate can also be one or more of a flat plate, a corrugated plate or an arc plate structure, and can be arranged and combined in layers vertically, radially or in any direction.

8. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 7, characterized in that: Furthermore, the wind control and anti-drift plate may also be provided with a ventilation and vortex elimination area, which is ventilation-permeable and can effectively reduce the lateral vortex in the flow channel, reduce the wind intake resistance, increase the radial air intake volume of the cooling tower, and optimize the uniformity and stability of the wind intake flow field; the ventilation and vortex elimination area is arranged on the wind control and anti-drift plate, and its opening rate is 0% ≤ η≤ 100%.

9. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 8, characterized in that: The top wind control device has an outer end overlapped with the top of the circumferential wind control device, and an inner end connected to the outer wall of the tower body, and is an annular flat plate structure arranged around the tower; the inner end of the top wind control device is .

10. A natural ventilation wet cooling tower coupled with rain area droplet suppression and air inlet flow field optimization according to claim 9, characterized in that: Furthermore, the rain area droplet suppression device can also be arranged in the non-side wind section around the cooling tower air inlet to adapt to changes in ambient wind direction.

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