JP3376018B2 - Crossflow cooling tower - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross flow type cooling tower.

[0002]

2. Description of the Related Art Generally, when white smoke is generated in the winter from the exhaust port of a cross flow type cooling tower of this type, the resident feels an aversion to pollute the outside air, and at night, If a red ray hits the area, it may be mistaken for a fire, which may interfere with the mental health or fire fighting activities of nearby residents, and there is a tendency to develop a white smoke prevention type. For example, there is a device for providing a heat pipe or the like in the vicinity of or in the vicinity of the exhaust port to slightly heat the exhausted air and exhaust the air to the outside, and this is a temporary achievement.

[0003]

However, these special heat pipes are quite expensive, and the cooling tower itself is
In order to incorporate these things, a special structure has to be made, which raises the cost of the cooling tower main body and there is a feeling that it is just one step away from popularization. In order to solve the above-mentioned problems, the upper water tank in the cross flow type cooling tower described in Japanese Patent Application Laid-Open No. 1-260291 filed in the name of the application has two regions on the upstream side and the downstream side in the flow direction of the external air flow. It is a partition of the upper water tank. However, in the one described in the above publication, in the winter, the air taken in from the air intake comes into direct contact with the sprayed water and becomes moist air, and then indirectly contacts with the treated water on the exhaust side to increase the temperature, Since it lowers the humidity, it cannot generate sufficient dry air. The present invention improves the structure of the cooling tower described in the above publication,
High temperature dry air is generated by a simple structure, and moist air and this dry air are generated in parallel. It is an object of the present invention to provide a heat exchanger for a cross flow type cooling tower capable of preventing smoke generation to the market.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention uses a vertical partition plate to form at least 2 in the width direction of the outside air intake of the upper water tank of a cross flow type cooling tower. The water is divided into water sprinkling compartments, and a plurality of closed heat exchangers in which circulating cooling water flows are arranged in the upper and lower layers below the upper water tank. The straight tubes of the hermetic heat exchanger are arranged at intervals in the axial direction of the straight heat exchanger, and the straightening vanes are arranged at a position directly below the partition plate, and only the air is taken in on the suction side with these straightening vanes as boundaries. From the discharge side to the air-only passage and the gas-liquid contact passage are formed adjacently in parallel in the width direction of the outside air intake corresponding to the sprinkling section area. It is as a cooling tower. In order to solve the above-mentioned problem, the inside of the upper water tank of this cross-flow cooling tower is divided into three sprinkling compartments by two partition plates that are vertical in the width direction of the outside air intake of the cooling tower. It is preferable that a spray water supply pipe for supplying spray water is provided in a central area of the water spray division area, and the partition plate also functions as a spray water dam plate. In order to solve the above-mentioned problems, the straightening vanes of this cross flow type cooling tower are of a split type, and the lower end of the upper straightening vane is covered with the outer side of the upper end of the lower straightening vane with reference to the air-only passage. It may be assembled on the straight pipe part of the sealed heat exchanger by superimposing it on the above.

[0005]

The operation of the invention described in claims 1 to 3 will be described. During the rainy season, when white smoke frequently occurs in winter,
The cross flow type cooling tower is operated, and the sprayed water is sprayed only into the gas-liquid contact passage from the spray division area in the upper water tank corresponding to the gas-liquid contact passage, and both sides of the gas-liquid contact passage are formed. A wet wall is formed on the inner wall of the current plate.

On the other hand, the air sucked from each of the outside air intake ports comes into direct contact with the sprayed water sprayed in the gas-liquid contact passage, cooling the sprayed water flowing down by the latent heat of vaporization, and at the same time, The air becomes moist air. Further, the air passing through the air-only passage is indirectly contacted with the sprayed water via the wall surface of the straightening vane to be heated, and at the same time, the circulating cooling water (hot water) flowing in the sealed heat exchanger at each stage. Is indirectly cooled to become dry air that has itself heated, and the moist air and dry air flow in parallel and flow toward the space at the center of the cooling tower below the exhaust port of the cooling tower, and in this space, Both the humid air and the dry air are mixed while rising toward the upper exhaust port provided in the cross flow type cooling tower, and do not become supersaturated air and are discharged outside without white smoke during the rainy season and winter when the humidity is high. Exhausted.

Further, by the above-mentioned rectifying plate in the air passage,
The air is guided, and the air is agitated by the multi-stage straight pipe section that traverses the air-only passage, is mixed in the vertical direction, and flows horizontally through the air-only passage. When white smoke is not generated and 100% of the cooling capacity is required as in spring and summer, the spray water supply pipe increases the amount of spray water supplied to the central part of the upper water tank to increase the amount of spray water supplied. A part of the water is passed over the partition plate into the sprinkling compartments on both sides of the water tank, sprayed water is sprinkled on the gas-liquid contact passage and the air-only passage, and circulation cooling is performed in the sealed heat exchanger. Indirectly cools water (warm water).

[0008]

EXAMPLE This example is a typical example of the invention described in claims 1 and 2. In FIG. 1, A is an upper water tank of a cross flow type cooling tower B, and the inside of this upper water tank A is composed of two vertical partition plates 20 so that three water sprays are made in the width direction of the outside air intake of this cooling tower B. It is divided into 3 sections. Below the upper water tank A, a plurality of closed heat exchangers 11 are arranged in a hierarchical manner in the upper and lower layers, and circulating cooling water flows therein. These closed heat exchangers 1
Two straightening vanes 10 are arranged in the straight pipe portion 1 at a distance from each other in the axial direction and at a position right below the partition plate 20. A gas-liquid contact passage 13 is formed between the vertical flow straightening plates 10 and 10, and the gas-liquid contact passage 13 is formed.
Air-only passages 12 through which only air passes from the suction side to the discharge side are formed on both sides of the air-conditioning plate 10 as boundaries.

The current plate 10 may be a single plate having a large number of holes through which all the straight pipes of the upper and lower hermetic heat exchangers 11 penetrate, or may be divided into a plurality of plates (see FIG. 2 and FIG. 3). In the case of the split type, the upper side straightening vane 10 is overlapped with the lower end of the upper side straightening vane 10 so as to cover the outside of the upper end of the lower side straightening vane 10 with reference to the air passage 12 (see FIGS. 2 and 3). The material of the straightening plate 10 is not particularly limited, but a PVC plate or a metal plate formed by vacuum forming is preferable (corresponding to the representative embodiment of the invention described in claim 3). Of the area
A spray water supply pipe for supplying spray water is provided in the central compartment, and the partition plate 20 also serves as a dam plate for spray water (see FIG. 1).

If necessary, a plurality of rectangular low-height rectangular filling plates 29 are inserted between the straight pipe portions in parallel with the straightening vanes 10 at a small pitch, and air flows between the filling plates 29. It is provided as a passage and has a structure in which a wetting wall is formed on the surface of the filling plate 29 when the sprayed water is sprayed. The operation of the cross-flow cooling tower of the above embodiment is the same as the operation of the invention described in the corresponding claims, and the description thereof is omitted here to avoid duplication.

[0011]

According to the invention described in claim 1, during the rainy season, in winter, the air passing through the air-only passage from the sprinkling section of the upper water tank is discharged from the section area of the divided upper water tank. It is heated indirectly by contact with the sprayed water sprayed in the gas-liquid contact passage through the wall of the straightening vane, and is also indirectly heated by hot water that is circulating cooling water flowing in the closed heat exchanger. , Is efficiently heated to become dry air, and the air taken in from the outside air intake of the cooling tower in the gas-liquid contact passage becomes moist air whose absolute humidity becomes high by directly contacting the spray water. Let the moist air flow in parallel, and raise them together towards the exhaust port,
It is possible to mix these two kinds of air with an air blower at the exhaust port, and to exhaust the mixed air to the outside air without causing white smoke in the winter and the intermediate period without making it supersaturated air. Furthermore, the air is agitated by the multi-stage straight pipe section that traverses the air-only passage and the gas-liquid contact passage, and the air can be mixed vertically and flow horizontally in the passage.

According to a second aspect of the present invention, the inside of the upper water tank is divided into two by a vertical cutting plate in the width direction of the outside air inlet of the cooling tower, and the spray water is supplied to one of the divided areas. Since a supply pipe is provided and the partition plate is also used as a weir plate for spray water, the flow of spray water to the dedicated air passage will be the flow rate of the spray water supplied to one of the compartments. It can be selected by increasing or decreasing.

According to a third aspect of the present invention, the straightening vanes are of a split type, and the upper straightening vanes are overlapped so as to cover the outer ends of the lower straightening vanes with reference to the air passage. In addition, since it is assembled to the straight pipe part of the closed heat exchanger, it is possible to prevent the sprayed water sprayed from the upper water tank from entering the air-only passage, and efficiently raise the temperature of dry air. In addition to good performance, the straightening plate can be assembled to the straight pipe portion in a direction perpendicular to the axial direction of the straight pipe portion, that is, in the vertical direction.
If a large number of the filling plates 29 are inserted between the straight pipe portions at a small pitch, a large amount of moist air is generated and the cooling capacity in the summer can be further enhanced.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a front view showing an example of a current plate.

FIG. 3 is an exploded side view showing the uppermost rectifying plate and the next rectifying plate in FIG.

[Explanation of symbols]

A upper tank 10 Current plate 11 Air passage 12 Gas-liquid contact passage 20 partition boards

Claims (3)

(57) [Claims] 1. An upper water tank of a cross flow type cooling tower is divided into at least two parts by a vertical partition plate in a width direction of an outside air intake of the cooling tower to form mutually sprinkling partition areas. A plurality of closed heat exchangers in which circulating cooling water flows are arranged vertically below the upper water tank, and the straight pipes of these closed heat exchangers are spaced in the axial direction. And the straightening vanes are arranged at a position directly below the partition plate, and only the air passes from the suction side to the discharge side with the straightening vanes as a boundary, and the gas-liquid contact is made. A cross-flow type cooling tower, characterized in that a passage and a passage are formed adjacent to each other in the width direction of the outside air intake in parallel with each other corresponding to the sprinkling section. 2. The inside of the upper water tank is divided into three water-splitting zones by two partition plates which are vertical in the width direction of the outside air intake of the cooling tower. The crossflow cooling tower according to claim 1, wherein a spray water supply pipe for supplying spray water to the area is provided, and the partition plate also serves as a dam plate for the spray water. 3. The hermetically sealed heat exchanger, wherein the straightening vane is of a split type, and the lower end of the upper straightening vane is overlapped so as to cover the upper end of the lower straightening vane with reference to the dedicated air passage. The straight pipe part of the assembly is assembled.
The cross-flow cooling tower according to 1 or 2.