CN210952491U - A device for improving the effect of ambient crosswind on the heat and mass transfer performance of cooling towers - Google Patents

Abstract

The utility model discloses a device for improving the influence of environmental side wind on the heat and mass transfer performance of a cooling tower. A plurality of air guide plates are evenly arranged at the air inlet of the cooling tower in the circumferential direction, and a plurality of air guide pipes are evenly arranged in the rain area of the cooling tower. The air guide pipe extends from the outer edge of the air inlet of the cooling tower to the central area of the cooling tower, and communicates with the vertical shaft. The arrangement of the air guide pipe of the utility model reduces the air inlet resistance, reduces the airflow temperature and humidity level in the central area, and the arrangement of the air guide plate improves the aerodynamic field of the air inlet, so that the air entering the tower on the windward side of the cooling tower can be as much as possible It flows radially into the tower in the horizontal direction, reducing the air outflow area behind the air inlet side of the cooling tower, increasing the longitudinal ventilation volume of the cooling tower, and improving the heat and mass transfer of the cooling tower under the coupling effect of the two. performance.

Description

A device for improving the effect of ambient crosswind on the heat and mass transfer performance of cooling towers

technical field

The utility model relates to a device for improving the influence of environmental side wind on the heat and mass transfer performance of a cooling tower, belonging to the technical field of energy saving and efficiency improvement of cooling towers.

Background technique

The cooling tower is one of the important cold-end equipment in thermal power plants, and its operating conditions have a great impact on the economics of the unit. At present, the main cooling tower used is the natural ventilation countercurrent wet cooling tower. The bottom of the tower is the air inlet, and the surrounding air enters the tower from the lower air inlet, passes through the rain area, the packing area and moves upward. During the upward movement , conduct heat exchange with the high-temperature circulating water sprayed by the water distribution system. The high-temperature circulating water is sprayed into the packing area through the water spraying system, and then enters the rain area through the packing area, and finally flows into the collection tank. Due to the existence of the rain curtain, the air is very It is difficult to enter the central area of the cooling tower, which makes the temperature in the central area of the cooling tower very high, which reduces the heat and mass transfer performance of the cooling tower.

Under ambient crosswind conditions, the flow of air near the air inlet of the cooling tower is not only driven by the suction force to flow inside and outside the tower, but also affected by the horizontal inertial force of the crosswind, so that the air flow field at the air inlet is no longer uniformly distributed in the circumferential direction. The ambient crosswind with high wind speed can even cause cross-draft at the back of the air inlet, which directly reduces the air flow into the tower and reduces the air-water ratio of the cooling tower. The environmental crosswind induces a large longitudinal vortex in the tower, which increases the ventilation resistance, reduces the air velocity in the vortex area, and weakens the heat and mass transfer between air and water in some areas of the tower. Under cross-wind conditions, the formation of the lateral ventilation of the cooling tower makes part of the air entering the tower only pass through the rain area for heat and mass transfer, and then is discharged from the air inlet at the rear side of the cooling tower, reducing the impact on the heat and mass transfer areas in the tower. Effective longitudinal ventilation.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a device for improving the influence of the environmental side wind on the heat and mass transfer performance of the cooling tower, which can reduce the temperature in the central area of the cooling tower, reduce the longitudinal vortex caused by the environmental side wind, and increase the Longitudinal ventilation to improve the heat and mass transfer performance of the cooling tower.

The technical scheme mainly adopted in the utility model is:

A device for improving the effect of ambient crosswind on the heat and mass transfer performance of a cooling tower. A number of air guide plates are evenly arranged in the circumferential direction of the air inlet of the cooling tower, and a number of air guide pipes are evenly arranged in the rain area of the cooling tower. The outer edge of the air inlet of the cooling tower extends to the central area of the cooling tower and communicates with the shaft.

Preferably, the shape of the wind deflector is a rectangular sheet.

Preferably, the air duct has an arched structure.

Preferably, the air guide plates are arranged along the circumference of the air inlet of the cooling tower, and the air guide plates are fixed on the ground and the outer wall of the cooling tower, and the number of the air guide plates is 36.

Preferably, the air inlet of the air duct is flush with the air inlet of the cooling tower, the air outlet of the air duct goes deep into the shaft and communicates with the shaft, and the number of the air duct is 4.

Preferably, four of the air ducts are arranged in a circumferential array in the cooling tower, and the included angle θ _cw between one of the air ducts and the annual average wind direction is 0°.

Preferably, the air ducts are divided into three sections, wherein the porosity of one section located in the central area of the cooling tower is 0.714, and the porosity of the other two sections is 0.323.

Preferably, the shaft is cylindrical, the shaft is communicated with the air outlet of the air duct, and the bottom of the shaft is higher than the water collection tank for a distance to prevent the water in the water collection tank from entering the shaft, the shaft is located in the cooling At the inner center of the tower, and at the center of the four air guide pipes.

Beneficial effects: The utility model provides a device for improving the effect of environmental side wind on the heat and mass transfer performance of the cooling tower. The arrangement of the air duct reduces the air inlet resistance, reduces the airflow temperature and humidity level in the central area, and the air guide plate The setting of the cooling tower improves the aerodynamic field of the air inlet, so that the air entering the tower on the windward side of the cooling tower can flow into the tower in the horizontal direction and radially as much as possible, reducing the air outflow area behind the air inlet side of the cooling tower and increasing the cooling effect. The vertical ventilation volume of the tower, under the coupling action of the two, improves the heat and mass transfer performance of the cooling tower.

Description of drawings

Figure 1 is a schematic diagram of a wind deflector air control scheme;

Figure 2 is a schematic diagram of the installation position of the air duct;

Figure 3 is a schematic diagram of an air duct;

4 is a schematic diagram of the influence of the device of the present invention on the temperature drop of the cooling tower under the condition of cross wind;

In the figure: air guide plate 1, air guide pipe 2, shaft 3, porous structure 4.

Detailed ways

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, and Not all examples. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

As shown in Figure 1-3, a device for improving the effect of ambient crosswind on the heat and mass transfer performance of a cooling tower. A number of air guide plates 1 are evenly arranged around the air inlet of the cooling tower, and a number of guide plates 1 are evenly arranged in the rain area of the cooling tower. The air duct 2 extends from the outer edge of the air inlet of the cooling tower to the central area of the cooling tower, and communicates with the vertical shaft 3 . (In this utility model, the air inlet of the cooling tower is arranged in a net shape all around, and the air can be fed in all the week.)

Preferably, the shape of the wind deflector 1 is a rectangular sheet.

Preferably, the air duct 2 is an arched structure (its vertical cross section is an arched structure).

Preferably, the air guide plates 1 are arranged along the circumference of the air inlet of the cooling tower, and the air guide plates are fixed on the ground and the outer wall of the cooling tower, and the number of the air guide plates 1 is 36 pieces.

Preferably, the air inlet of the air duct 2 is flush with the air inlet of the cooling tower, the air outlet of the air duct goes deep into the shaft 3 and communicates with the shaft 3, and the number of the air duct 2 is 4 .

Preferably, four of the air ducts 2 are arranged in the cooling tower in a circumferential array, and the included angle θ _cw between one of the air ducts 2 and the annual average wind direction is 0°.

Preferably, the air ducts 2 are divided into three sections, all of which are designed with a porous structure, wherein the porosity of one section located in the central area of the cooling tower is 0.714, and the porosity of the other two sections is 0.323. (In this utility model, the meaning of porosity is the ratio of the area of the hole to the total area of the section)

Preferably, the vertical shaft 3 is cylindrical, the vertical shaft 3 communicates with the air outlet of the air duct 2, and the bottom surface of the vertical shaft 3 is higher than the water collection tank by a distance, which can prevent the water in the water collection tank from entering the vertical shaft.

As shown in Figure 4, the coupling between the air guide plate 1 and the air guide pipe 2 increases the temperature drop Δt _w of the cooling tower and strengthens the cooling capacity of the cooling tower; wherein, the setting of the air guide plate 1 reduces the intake air The resistance reduces the airflow temperature and humidity level in the central area, and improves the aerodynamic field of the air inlet, so that the air entering the tower on the windward side of the cooling tower flows radially into the tower in the horizontal direction as much as possible, reducing the amount of air behind the air inlet side of the cooling tower. In the air outflow area, the longitudinal ventilation volume of the cooling tower is increased, so that more air can exchange heat and mass with the high-temperature circulating water. The setting of the air duct 2 reduces the air intake resistance and reduces the airflow temperature and humidity level in the central area. , so that the air can better enter the central area of the cooling tower for heat exchange with the high-temperature circulating water, which improves the cooling effect and cooling efficiency.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (8)

1. A device for improving influence of ambient crosswind on heat transfer and mass transfer performance of a cooling tower is characterized in that: a plurality of air deflectors are uniformly arranged at the air inlet of the cooling tower in the circumferential direction, a plurality of air guide pipes are uniformly arranged in the rain area of the cooling tower, and the air guide pipes extend to the central area of the cooling tower from the outer edge of the air inlet of the cooling tower and are communicated with the vertical shaft.

2. The apparatus of claim 1, wherein the apparatus for improving the effect of ambient crosswind on the heat and mass transfer performance of the cooling tower comprises: the air deflector is rectangular sheet.

3. The apparatus of claim 1, wherein the apparatus for improving the effect of ambient crosswind on the heat and mass transfer performance of the cooling tower comprises: the air guide pipe is of an arch structure.

4. The device for improving the influence of ambient crosswind on the heat and mass transfer performance of a cooling tower as claimed in claim 1 or 2, wherein: the air guide plates are arranged along the circumferential direction of the air inlet of the cooling tower and fixed on the ground and the outer wall of the cooling tower, and the number of the air guide plates is 36.

5. The device for improving the influence of ambient crosswind on the heat and mass transfer performance of a cooling tower as claimed in claim 1 or 3, wherein: the air inlet of the air guide pipe is flush with the air inlet of the cooling tower, the air outlet of the air guide pipe extends into the vertical shaft and is communicated with the vertical shaft, and the number of the air guide pipes is 4.

6. The device of claim 5, wherein 4 of the wind-guiding tubes are arranged in a circumferential array in the cooling tower, and one of the wind-guiding tubes forms an angle θ with the average annual wind direction_cwIs 0 deg..

7. The device for improving the influence of ambient crosswind on the heat and mass transfer performance of a cooling tower as claimed in claim 1 or 6, wherein the air guide pipe is divided into 3 sections, wherein the porosity of one section in the central area of the cooling tower is 0.714, and the porosity of the other two sections is 0.323.

8. The apparatus of claim 7, wherein the apparatus for improving the effect of ambient crosswind on the heat and mass transfer performance of the cooling tower comprises: the vertical shaft is cylindrical and is communicated with the air outlets of the air guide pipes, the bottom surface of the vertical shaft is higher than the water collecting pool by a distance and is used for preventing water in the water collecting pool from entering the vertical shaft, and the vertical shaft is located in the center of the interior of the cooling tower and is located in the center of the four air guide pipes.

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