JPS6234158Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cooling water tower that has a wet cooling section and uses external air to directly cool hot water flowing down the cooling section. This invention relates to a cooling tower recirculation prevention device that prevents water from being caught in a wet cooling section.

Conventionally, a water cooling tower has wet cooling sections arranged in a circular, rectangular or polygonal shape, and a fan stack installed on top of the wet cooling section. The hot water is cooled by direct heat exchange between the hot water and the outside air, and the cooled outside air is discharged from the fan stack as moist air or steam.

The steam discharged from the fan stack of this cooling tower has directivity with respect to the wind direction and wind speed. For example, as shown in FIG. 1, if the wind is flowing toward the cooling tower 1 as shown by arrow 2, The steam 4 discharged from the fan stack 3 flows downwind, and also flows into the cooling tower 1.
Since a depressurized region 5 is formed on the leeward side of the cooling tower 1, an entrained airflow as shown by the arrow 6 in the figure is generated, so that a part of the steam 4 is sucked into the cooling tower 1 again. This recirculation changes depending on weather conditions such as wind direction and wind speed, and the size and shape of the cooling tower, but depending on the situation, there is a problem in that the cooling efficiency of the cooling tower can be reduced by several tens of percent.

The purpose of the present invention is to prevent steam etc. discharged from the fan stack from being sucked into the cooling tower again.

In the present invention, a fan stack is provided approximately in the center above the fan deck at the upper part of the cooling water tower, and a recirculation prevention plate is provided on the outer periphery of the fan stack at a predetermined distance from the fan deck and so as to cover the fan deck. The upper surface of the recirculation prevention plate restricts the steam that is discharged from the fan stack and attempts to flow downwind of the tower so that it flows as far as possible downwind of the tower. By rectifying the wind from the space between the tower and flowing it to the leeward side of the tower, steam etc. are prevented from being drawn into the reduced pressure area on the leeward side of the tower.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the cooling tower recirculation prevention device according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a cooling water tower, which is composed of wet cooling sections 7 arranged in a circular, polygonal, or square shape, and a fan stack 3 provided approximately in the center on a fan deck 8 that covers the upper part of the wet cooling section 7. .

A water tank 9 is provided on the wet cooling unit 7 , and hot water to be treated is supplied from a header 10 on the fan deck 8 to the water tank 9 . A basin 11 for collecting cold water is provided at the lower part of the wet cooling section 7, and a louver 12 for introducing outside air is provided on the outer periphery.

The fan stack 3 is comprised of a stack 13 provided protruding approximately at the center of the fan deck 8 and a fan 14 provided within the stack 13. The fan 14 is connected to a drive device 15 provided on the fan deck 8.

A horizontal recirculation prevention plate 16 is provided on the outer periphery of the stack 13 and at a predetermined distance h from the fan deck 8 so as to cover the lower part of the fan deck 8. This recirculation prevention plate 16 is formed to have substantially the same shape and size as the fan deck 8, and is provided so as to cover substantially the entire fan deck 8.

Next, the operation of the present invention will be explained.

The steam 4 discharged from the fan stack 3 flows on the leeward side with respect to the wind direction of the arrow 2, as shown in FIG. On the leeward side of the cooling tower 1, the dotted line P shown in the figure
A depressurized area 5 is formed in the area surrounded by , and an entrained airflow as shown by the arrow 6 in the figure is generated.

In this case, the flow of steam 4 discharged from the fan stack 3 downward into the cooling tower 1 is regulated by the recirculation prevention plate 16, and a gap h is formed between the recirculation prevention plate 16 and the fan stack 8. An air current flows through the space 17 as shown by an arrow 18, and this air current prevents the steam 4 from being drawn into the reduced pressure area 5.

The space 17 between the recirculation prevention plate 16 and the fan deck 8 is isolated from the fan stack 3 by the prevention plate 16. Therefore, since the wind flows horizontally in a rectified state, the steam 4 is transferred to the cooling water tower 1.
The steam 4 flows into the decompression area 5.
can be prevented from getting caught.

As is clear from what has been described in detail above, the present invention exhibits the following excellent effects.

(1) Since a recirculation prevention plate is provided around the outer circumference of the fan stack at a predetermined distance from the fan stack and so as to cover the fan stack,
It is possible to prevent steam, etc. exhausted from the fan stack from flowing downward into the tower, and also to create a rectified airflow from the space between the fan stack and the recirculation prevention plate, which allows the steam to be transported far to the lee of the tower. This prevents steam from being drawn into the tower.

(2) It is possible to prevent the emitted steam from being entrained.
Decrease in cooling tower performance due to recirculation is reduced.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the exhaust state of a conventional cooling water tower, Fig. 2 is a front sectional view showing an embodiment of the cooling tower recirculation prevention device according to the present invention, and Fig. 3 is a diagram showing the cold water supply according to the present invention. It is a figure showing the use state of a tower recirculation prevention device. In the figure, 1 is a cooling water tower, 3 is a fan stack, 8 is a fan deck, and 16 is a recirculation prevention plate.

Claims (1)

[Scope of utility model registration request] A fan stack is provided approximately in the center above the fan deck at the upper part of the cooling water tower, and a recirculation prevention plate is provided on the outer periphery of the fan stack at a predetermined distance from the fan deck and so as to cover the fan deck. Cooling tower recirculation prevention device.