JPS5813838B2 - Chiyokukoryuugatareikyakutou - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cross-flow cooling tower, and improves the fixed water spray tank inside the tower to reduce fluctuations in gas-liquid contact efficiency due to fluctuations in liquid volume load, and to achieve maximum efficiency even with a small liquid volume. The purpose is to obtain contact efficiency and reduce carryover.

Conventionally, a cross-flow type cooling tower having a fixed water sprinkler tank is equipped with a louver 2 on the side of the tower body 1, as shown in Fig. A packing material 3 through which an air flow introduced by the suction force of a driven fan 7 is housed inside the tower body 1, and a fixed water tank 4 and a lower water tank 5 are provided at the upper and lower parts of the packing material 3, respectively. be.

As shown in FIG. 2, a normal fixed watering tank 4 has a large number of watering holes 8 at the bottom for watering, the bottom itself is arranged horizontally, and a dispersion plate 9 is provided below the watering holes 8. are doing.

However, in a cross-flow type cooling tower with such a structure, as shown in Fig. 3, the airflow is directed against the flow of water falling from the watering holes 8 drilled at the bottom of the fixed watering tank 4 as shown by arrow A. Since the water flows at right angles through the gaps in the filling material 3, the following problems were unavoidable.

m Decrease in cooling efficiency (gas-liquid contact efficiency) Since the water is swept away by the air flow, the water flow is biased in the diagonal direction as shown by arrow W, and the air inlet part at the bottom of the packing 3, that is, the air inlet part It creates a space where water does not flow,
At the same time, a space opening through which air does not pass is created in the air outlet portion, which impairs cooling efficiency.

(2) Increase in carryover Since water flows toward the air outlet portion of the packing 3 due to the water drift as described in (1) above, the water droplets tend to be carried by the wind.

That is, water flowing through the center of the packing will not be blown away by the wind outside the packing, but if the water flows unbalanced to the air outlet portion of the packing, it is likely to cause carryover.

In order to prevent the above-mentioned uneven flow of water, various methods can be used, such as making the packing material have a rhombic cross-sectional shape, or adding backflow waves to the packing material, that is, waves shaped so that the water moves toward the air inlet of the packing material. Countermeasures have been taken so far, but although the former has the advantage of eliminating areas where water does not flow, the number of areas where air does not pass increases and cooling efficiency does not improve.

In the latter case, the area where water does not flow can be considerably reduced due to the forced flow of water, but because the wave direction is inclined from the top toward the wind inlet, the wind flows through the shortest distance, and the wind does not flow. The cooling efficiency is not significantly improved due to the significant increase in the number of parts.

This invention focuses on these points and improves the fixed water sprinkler tank, and by dropping a larger amount of water onto the air inlet of the filling, the airflow that blows through the filling Water is uniformly dispersed, voids where water does not flow are eliminated, cooling efficiency can be increased, and carryover can be significantly reduced by reducing the amount of water flowing out to the air outlet portion of the packing.

The structure of the present invention is to form the bottom surface into an appropriate shape by sloping the bottom plate of the fixed water sprinkler of a cross-flow type cooling tower into a slope shape or a step-like shape so as to make the depth of the water tank shallow at the air inlet part of the fixed water sprinkler. This is a cross-flow type cooling tower characterized by having a fixed water sprinkler tank.

As shown in FIG. 4, which explains the present invention with reference to the embodiments shown in the accompanying drawings, 1 is a tower body, 2 is a louver 3 is a filling, 5 is a lower water tank, and 6 is a motor for driving a fan 7. Everything is the same as with conventional cross-flow cooling towers.

Reference numeral 10 denotes a fixed water spray tank, and a fan 7 and a motor 6 for sucking atmospheric air through the louver 2 are installed in a circular hollow part.

The bottom of the fixed water spray tank 10 is deep on the wind inlet side and shallow on the wind outlet side.

That is, the bottom surface is formed lower toward the outside than the inside,
A large amount of water is stored on the outside, and a large amount of water is dropped from the sprinkling hole to the air inlet part of the filling 3 located below, and the amount of water that should fall is gradually reduced as it goes inward. In this case, the amount is limited to a very small amount.

Further, a cylindrical shielding plate 11 covers the upper end periphery of the inner side (air outlet portion) of the packing 3 below the circular hollow part of the fixed water sprinkler tank 10 to block the relationship with the suction force of the fan 7.

The structure of the bottom of the fixed water sprinkler tank 10 may be formed by making the bottom plate slope downward from the inside to the outside as shown in Figure 5a, or by forming the bottom plate into a stepped shape as shown in Figure b. The bottom surface may be made shallower or shallower by forming it lower in order from the outside.

Of course, the required number and size of water spray holes 8 can be made in the bottom surface.

Although the description has been made regarding a cross-flow type cooling tower, the present invention can also be widely applied to various types of cross-flow type packed towers.

According to the present invention configured as described above, when changing the amount of water in the cooling tower depending on the outside air temperature condition, for example, if the amount of water is small, the water falls and flows from the air inlet section with the best cooling conditions.

On the other hand, if the amount of water is large, water will flow uniformly into the filling from the side with high water pressure, and from the side with low water pressure, it will flow uniformly into the filling. Cooling efficiency is extremely high as less water falls and flows in certain areas.

In addition, under normal conditions, a large amount of water falls at the air outlet of the packing and less at the air inlet, so the water is distributed evenly into the packing, eliminating areas where water does not flow, increasing cooling efficiency. can.

Furthermore, since less water flows into the air outlet portion of the packing, carryover can be reduced.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of a conventional cross-flow type cooling tower. Figure 2 is an enlarged illustration of the fixed water spray tank in Figure 1. Figure 3 is an enlarged diagram showing the state of gas-liquid contact in the main parts of Figure 1. FIG. 4 is a schematic explanatory diagram showing an embodiment of the present invention, and FIG. 5 is an enlarged sectional view of one half of a specific example of the fixed water tank shown in FIG. 1. 1... Tower body, 2... Louver, 3...
... Filler, 8 ... Watering hole, 10 ...
・Fixed water tank, 11...Break plate.

Claims (1)

[Claims] 1 By sloping the bottom plate of the fixed sprinkler system of a cross-flow type cooling tower in the form of a slope or a step, the depth of the water tank at the air inlet part of the fixed water sprinkler system is deepened, and the depth of the water tank at the air outlet part is made shallower. A cross-flow type cooling tower characterized by being equipped with a fixed water sprinkler tank whose bottom surface is formed into an appropriate shape.