JPH0481118B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Field of Industrial Application) This invention relates to a cross-flow type cooling tower, and particularly relates to one that does not generate white smoke (wet steam) from the upper exhaust port. It is.

(Prior technology) Generally speaking, when white smoke is generated from the exhaust port of a cooling tower, nearby residents feel disgusted as if it is polluting the outside air, and when it is exposed to red light at night, it can cause a fire. There is a risk that people may mistakenly think that it is the same, which may impede the mental health of nearby residents or firefighting activities, and there has been an increase in demand for solutions that do not emit white smoke in recent years.

The applicant company of this application has already
In No. 58-42781 and Japanese Patent Publication No. 59-24788, a coil is installed near or inside the exhaust port to pass uncooled hot water among the cooled water,
Alternatively, a device has been developed that uses heat pipes to slightly heat the exhaust air and exhaust it to the outside, and has achieved some success.

(Problem to be solved by the invention) However, these special hot water coils and heat pipes are quite expensive, and the cooling tower itself
In order to incorporate these items, a special structure must be constructed, which increases the cost of the cooling tower itself, making it difficult to see it becoming more widespread.

The object of the present invention is to obtain a cooling tower that solves the above problems and prevents generation of white smoke.

B. Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the cooling tower of the present invention is provided with a blower at the exhaust port provided in the outer casing of the cooling tower,
After heat exchange was performed between the air flow sucked into the outer casing from the outside air intake port of the outer casing and the cooled water sprinkled from the upper water tank, the air was blown out into the space directly below the exhaust port. In a cross-flow type cooling tower that is then raised toward an exhaust port and exhausted to the outside from this exhaust port, a large number of filler plates with uneven surfaces on the surface where the water to be cooled is sprayed and flows down are arranged in parallel. At least two vertically stacked filler units are filled in the outer casing, facing the outside air intake port, and the space between the filler plates in the uppermost row of the filler units is Of these, at least 1 at each arbitrary interval
An air-only passage is formed between the filler plates at intervals, through which only air passes as a horizontal flow from the outside air intake side to the outlet side to the space, and the ceiling portions of the air-only passages are adjacent to each other. The cooling tower is characterized in that it is formed by covering the filler plate with a water sprinkler shield plate.

(Function) The cooling tower of the present invention configured as described above is similar to a normal cross-flow type cooling tower, when hot water to be cooled is supplied to the upper water tank, the hot water is first uniformly distributed to the upper filler unit. It is scattered and flows down along the surface of each of these air-only passages, but in each air-only passage, a cap plate is attached over the adjacent filling material plates, so that there is a surface in each of these air-only passages. Water is transmitted to the surface of the filler plate and does not flow down.

The water that has flowed down the surfaces of the upper filler plates is then spread over the lower filler units, flows down the surfaces of all the lower filler plates as a wet wall, and is collected in the lower water tank.

On the other hand, in areas where wet walls are formed by water spraying from above, the air sucked in from each outside air intake by the drive of the blower is exposed to direct contact with the low-temperature outside air and the latent heat of vaporization. to cool down.

However, in the air-only passage of the upper filler unit, the inner surface is not wet at all, and relatively high-temperature water flows down along the other surface of the filler plate, which is the boundary wall that constitutes the air-only passage. The filling material forming the boundary wall of the lever is loosened, and the air is indirectly heated by heat exchange with the air passing through this air-only passage, but its absolute humidity is maintained without contact with water. Therefore, the air remains unchanged and becomes dry, reaching the space directly below the exhaust port of the cooling tower, coming into direct contact with the water spray in the upper and lower filler units, and forming parallel flows with the humid air blown into this space toward the exhaust port. As the air rises, the humid air and dry air are mixed by the blower installed at the exhaust port, and the mixed air is exhausted to the outside from the exhaust port without becoming supersaturated air, and no white smoke is produced.

Furthermore, the water-sprinkling shade board prevents water to be cooled from entering the air-only passage.

(Example) Next, typical embodiments of the invention will be described.

In FIG. 1, 10 is a cross-flow type cooling tower, and the two opposing sides of its outer casing 11 are full air intake ports 12, and the inside of the air intake ports 12 has a surface including these. The filler unit 14, which is composed of a large number of thin synthetic resin filler plates 13 standing upright at right angles, is provided in at least two stages, one above the other. An upper water tank 15 is provided at the bottom for receiving cooled water, and a lower water tank 16 is provided at the bottom for receiving cooled water.
24 is a middle water tank provided between the filler units 14 in the lower stage. Reference numeral 26 denotes an exhaust port provided in the outer casing 11, and a blower 27 is provided at this exhaust port 26. Directly below this exhaust port 26, at least one of the spaces between the filler plates 13 of each stage is provided. A dedicated air passage 20 through which only air passes is provided between every other one (see FIG. 2).

This air-only passage 20 is formed by adjacent filler plates 13.
They are each formed on the lower side by an elongated cap plate 21 that is attached to the cap (see Fig. 3).

Although the cap board 21 shown in FIG. 3 is shown as being fixed between specific filler plates 13, it may be movable between different filler plates 13, detachable, or As shown in FIG. 4, the air passages 20 may be of an open/close type, and any number of air passages 20 may be made independent or interlocked, and the number of air-only passages 20 may be variable.

The operation of the cooling tower of the above embodiment is as follows.

First, when hot water to be cooled is supplied to the upper water tank 15, this water is first uniformly spread over the upper filler units 14, and each of these filler plates 13
However, in each air-only passage 20, the cap plate 21 flows over the adjacent filler plates 13.
Since the filler plates 13 are attached to each other in a water-tight manner, the air does not flow down onto the surfaces of the filler plates 13 facing the air-only passages 20, respectively.

The water that has flown down the surfaces of the upper filler plates 13 is once collected in the middle water tank 24, and is again spread over the lower filler units 14, flowing down the surfaces of all the lower filler plates 13 as wet walls. , are collected in the lower water tank 16.

On the other hand, in areas where wet walls are formed by water spraying from above, the air sucked in from the outside air intake ports 12 by the drive of the blower 27 is affected by direct contact with the low-temperature outside air and the latent heat of vaporization. It cools the water flowing down.

However, in the air-only passage 20 of the upper filler unit 14, the inner surface is not wet at all, and water, which is still relatively high in temperature, lies along the other surface of the filler plate 13, which is the boundary wall forming the air-only passage 20. The air flows down and warms the filler plate 13 forming this boundary wall, and the air is heated at intervals by heat exchange with the air passing through this air-only passage 20, but the absolute humidity is higher than that of water. Since there is no contact with
At step 4, the humid air comes into direct contact with the water spray and blows out into the space 25, forming a mutually parallel flow and rising upward toward the exhaust port 26, where the humid air and dry air are mixed with each other, and the mixed air becomes supersaturated air. The smoke is exhausted to the outside from the upper exhaust port 26 without any white smoke being generated.

C. Effects of the Invention In the cooling tower of the present invention, the uppermost filler unit of at least two stacked filler units is provided with an air-only passage through which no sprayed water flows. Since the air passing through these dedicated air passages is intermittently heat-exchanged with relatively high-temperature hot water via the filler plate, the dry air whose temperature has increased can be transferred to other air passages without increasing the absolute humidity. Due to gas-liquid contact, it can be blown into the space along with highly humid humid air, and the dry air and humid air that have risen in parallel flows toward the exhaust port are mixed by the blades of the blower rotating at low speed, Even if the area were illuminated at night without white smoke, the reflected light would not be visible.

In addition, this invention does not require any special structure for attaching effective hot water coils or heat pipes to the outer casing and exhaust port of the cooling tower or the passages leading thereto, and the present invention uses an extremely low-cost filling method usually formed by vacuum molding thin sheets of synthetic resin. By simply providing an air-only passage using a part of the timber plate, a sufficient effect can be achieved, and the volume of the cooling tower will hardly increase and the cost will not increase.

Furthermore, since the air-only passage is formed by capping the tops of the adjacent filler plates, there is no need for a specially shaped filler plate, and the air-only passage can be created by attaching only the shade plates. It can be formed easily and has a simple structure.

(Unique Effects of the Embodiment) Furthermore, in the case where the cap plate 21 is removable, the number of the cap plates 21 can be easily changed depending on the outside temperature.

In the case where a cap plate 21 that can be opened and closed independently is provided on the upper edge of the filler plate to configure the air-only passage 20, the number of air-only passages can be increased or decreased by simply opening and closing these. When the necessity is low, such as in the summer, the cooling tower 10 can be fully opened to effectively utilize the heat exchange efficiency of the entire cooling tower 10.

As shown in FIG. 1, in the case where a water tank 24 is provided in the middle stage and the water once received is sprinkled again, water can also be sprayed on the filler plate 13 in the lower stage directly under the upper air passage 20, and the lower stage The heat exchange rate of the filler unit has the same effect as the conventional example.

[Brief explanation of the drawing]

Drawings A typical embodiment of the present invention is shown, with FIG. 1 being a vertical sectional side view and FIG.
-2 line arrow front view, FIG. 3, and FIG. 4 are front views showing embodiments of the air-only passage, respectively. Main symbols in the figure: 10...Cooling tower, 12...Outside air intake, 13...Filler plate, 14...Filler unit, 20...Air dedicated passage.

Claims (1)

[Scope of Claims] 1. A blower is provided at the exhaust port provided in the outer casing of the cooling tower, and the air flow sucked into the outer casing from the outside air intake of the outer casing and the water to be cooled sprinkled from the upper water tank are combined. The air after heat exchange is blown out into the space directly below the exhaust port, and then raised toward the exhaust port,
In a cross-flow type cooling tower that exhausts air to the outside from the exhaust port, a filling material unit is installed in which a large number of filling material plates with uneven surfaces on the surface through which water to be cooled is sprayed and flows are stood up in parallel. The outer casing is filled with at least two layers stacked one above the other, facing the outside air intake port, and at least one filler plate is filled at an arbitrary interval between the plurality of filler plates in the uppermost layer of the filler unit.
An air-only passage is formed between the filler plates at intervals, through which only air passes as a horizontal flow from the outside air intake side to the outlet side to the space, and the ceiling portions of the air-only passages are adjacent to each other. A cooling tower characterized in that it is formed by covering a filler board with a water sprinkler shield board. 2. The cooling tower according to claim 1, wherein at least some of the several cap plates are openable and closable.