JPH06323763A - Dc/ac type cooling tower - Google Patents

Abstract

PURPOSE:To prevent white smoke from being produced from an exhaust port of a DC/AC type cooling tower in the rainy season and in the winter season by producing high temperature dried air with a simplified structure and mixing the dried air with wet air. CONSTITUTION:An upper water tank B of a DC/AC type cooling lower is divided into three portions with a vertical partition plate 20 in the width direction of a fresh air intake port of the cooling tower, and a plurality of closed heat exchangers 11 are disposed below the upper water tank B vertically hierachically. Vertical rectifier plates 10 are arranged at just under locations corresponding to the partition plate 20, separated away axially of straight pipe portions of the heat exchangers 11, and there are parallely formed an air only passage 12 and a gas/liquid contact passage 13 where only air passes from a suction side to an exhaust side taking the rectifier plate 10 as a boundary. The air flowing through the air-only passage 12 and the gas/liquid contact passage 13 is converted to dried air and wet air which are in turn mixed at a common exhaust port thus without producing white smoke.

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. This invention generates high-temperature dry air with a simple structure, and with the mixing of moist air and this dry air,
An object of the present invention is to provide to the market a heat exchanger for a cross flow type cooling tower, which can prevent white smoke from being emitted from the exhaust port of the cross flow type cooling tower in the rainy season and in the winter season.

[0004]

In order to solve the above-mentioned problems, the present invention relates to the inside of the upper water tank of a cross-flow cooling tower,
A vertical partition plate divides the cooling tower into at least two parts in the width direction of the outside air intake, and a plurality of closed heat exchangers are arranged vertically below the upper water tank. In the straight pipe portion of these closed heat exchangers that are flowing, there is an interval in the axial direction, and the rectifying plates are arranged at a position directly below the partition plate, with these rectifying plates as a boundary, It is characterized in that a dedicated air passage through which only air passes from the suction side to the discharge side and a gas-liquid contact passage are formed adjacent to each other in parallel. In order to solve the above problem, the upper water tank in this cross flow type cooling tower has two
It is characterized in that it is divided and a spray water supply pipe for supplying spray water is provided in one of the water tank portions, and the partition plate also serves as a dam for spray water. In order to solve the above problems,
A discharge port of a spray water pipe is opened in each of the compartments of the upper water tank, and at least one spray pipe is provided with a throttle valve for adjusting a spray water amount. In order to solve the above-mentioned problems, the upper water tank is divided into two, the bottom area of one of the divided areas is made wider than the sprayed bottom area of the other divided area, and an opening / closing valve is provided for each spray water pipe opening in each of the divided areas. Is provided.

[0005]

The operation of the invention described in claims 1 and 2 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 from within the gas-liquid contact passage from the partitioned area of the upper water tank corresponding to the gas-liquid contact passage. A wet wall is formed on the inner wall.

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 and becomes heated dry air, and in the space at the center of the cooling tower, it mixes with the moist air while rising toward the upper exhaust port provided in the cross-flow cooling tower, and supersaturated air is mixed. However, it is exhausted to the outside without white smoke during the rainy season and winter when the humidity is high.

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 passage, is mixed in the upper and lower directions, and flows horizontally in the air passage. When there is no white smoke and 100% cooling capacity is required as in the spring and summer, a part of the spray water supplied to the central part of the upper water tank by the spray water supply pipe is passed over the partition plate. The circulating cooling water (warm water) flowing in the hermetic heat exchanger is indirectly cooled by flowing the water into the water tank portions on both sides and spraying the sprayed water on the gas-liquid contact passage and the air passage.

According to the third aspect of the invention, the amount of water sprayed from the spray water pipe is adjusted by adjusting the opening of the throttle valve, and the throttle valve is fully opened in a period without white smoke, that is, in the summer. Using the entire upper water tank, spray water is sprayed on all the passages, and the circulating cooling water is indirectly cooled by the spray water. Next, during the rainy season, at the time of white smoke generation in winter, the opening of the throttle valve is reduced to adjust the flow rate of spray water,
The spray water is sprayed from the upper water tank only to the gas-liquid contact passage, the spray water is not sprayed to the air dedicated passage, humid air is generated, and the air flowing through the air dedicated passage is indirectly passed through the straightening plate. Cooling and indirectly cooling the circulating cooling water to obtain warmed dry air, and mixing the moist air and dry air at the exhaust port of the cooling tower without forming supersaturated air, that is, without producing white smoke. Exhaust.

According to the invention described in claim 4, in the winter season, the sprayed water is not supplied to one of the partitioned areas having a wide spray bottom area, and the sprayed water is supplied only to one of the partitioned areas having a narrow spray bottom area. And increase the amount of dry air generated.
In the middle of spring, autumn and rainy season, contrary to the above, the spray water is supplied only to a wide spray bottom area, and the amount of dry air generated is slightly reduced as compared with the winter season. In the summer season, spray water is supplied to all the parcels and 100% of cooling capacity is exerted.

[0010]

【Example】

Example 1 This example is a representative 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 divided into three by a vertical partition plate 20 in the width direction of the outside air intake of this cooling tower B. Below the upper water tank A, a plurality of closed heat exchangers 11 are arranged in a hierarchical structure in the upper and lower layers, and in the straight pipe portions of these closed heat exchangers 11 in which circulating cooling water flows, the axial direction of the closed heat exchangers 11 is arranged. Two straightening vanes 10 are arranged at a space below each other and directly below the partition plate 20. These vertical straightening plates 1
A gas-liquid contact passage 13 is formed between 0 and 10, and air is exclusively used for passing only air from the intake side to the discharge side on both sides of the gas-liquid contact passage 13 with the rectifying plate 10 as a boundary. A passage 12 is formed. The rectifying plate 10 may be a single plate having a large number of holes through which all the straight pipe portions of the upper and lower hermetic heat exchangers 11 penetrate, or may be divided into a plurality of plates. In the case of the split type, the upper straightening vanes are superposed so that the lower ends of the upper straightening vanes are covered with the upper ends of the lower straightening vanes (see FIGS. 2 and 3). This straightening plate 10
The material of is not particularly limited, but is preferably PV formed by vacuum forming.
C plate or metal plate is preferable. Of the three partitioned areas A1, A2, A3 of the upper water tank A, a sprayed water supply pipe 21 for supplying sprayed water to the central partitioned area A3 is provided, and the partition plate 20 also serves as a dam for sprayed water. (See FIG. 1). If necessary, a large number of rectangular low-height filling plates 29 are inserted at a small pitch between the straight pipe portions in parallel with the straightening vanes 10, and air gaps are provided between the filling plates 29. The wet wall is formed on the surface of the filling plate 29 when the spray water is sprayed.

Embodiment 2 This embodiment is a typical embodiment of the invention described in claim 3. The upper water tank A has a structure different from that of the first embodiment.
The divided water pipes 2 are divided into each of the divided areas A4 and A5.
The discharge ports 2 and 23 are open, and one spray water pipe 22
Is equipped with a throttle valve 24 for adjusting the amount of sprayed water (Fig. 4).
reference).

Embodiment 3 This embodiment is a typical embodiment of the invention described in claim 4. In the structure different from that of the second embodiment, opening / closing valves 27 and 28 are provided in the spray water pipes 25 and 26 whose discharge ports are opened in the divided areas A6 and A7 of the upper water tank A divided into two parts. At this time, the spreading bottom area of one of the divided areas A6 is formed larger than the spreading bottom area of the other divided area A7. In addition, the same reference numerals as those used in the embodiments mean the same configurations. The operation of the cross-flow cooling tower of each of the above-described embodiments is the same as the operation of the invention described in the corresponding claims, and the description thereof is omitted here to avoid duplication.

[0013]

According to the first aspect of the invention, the air passing through the air-only passage is sprayed from the partitioned area of the partitioned upper water tank into the gas-liquid contact passage and the straightening plate. In addition to being indirectly contacted and heated via the wall surface, it is indirectly heated by hot water that is circulating cooling water flowing in the closed heat exchanger, and is efficiently heated to become dry air. In this case, the air taken in from the outside air intake of the cooling tower becomes moist air with high absolute humidity by directly contacting the sprayed water, and both the dry air and the moist air are raised, and the air is blown by the blower at the exhaust port. Mixing two kinds of air, without making this mixed air supersaturated air,
It can be exhausted to the outside air without white smoke during the winter and intermediate seasons. 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 upper water tank is divided into two parts, a spray water supply pipe for supplying spray water is provided in one of the divided areas, and the partition plate also serves as a dam for the spray water. Therefore, it is possible to select the spraying of the sprayed water to the air-only passage by increasing or decreasing the flow rate of the spraying water supplied to one of the compartments.

In a third aspect of the present invention, a discharge port of a spray water pipe is opened in each of the compartments of the upper water tank, and at least one of the spray water pipes has a throttle for adjusting the amount of spray water. Since the valve is provided, it is only necessary to adjust the opening of the throttle valve to stop the spraying of the sprayed water to the air passage during the white smoke generation in the interim period and winter, and to cool the air when summer cooling is required. Spray water can also be sprayed on the dedicated passage.

[0016] In the invention described in claim 4, the upper water tank is divided into two, the bottom area of one of the divided areas is made wider than the sprayed bottom area of the other divided area, and each divided area is opened. Since each spray water pipe is equipped with an on-off valve, by selectively opening and closing the on-off valve, spray water can be spread over a large spread bottom area during the winter when the amount of white smoke is large. A large amount of dry air can be generated without supplying it, and in the middle period, the cooling capacity is given priority over the winter period. A slightly smaller amount of dry air can be generated as compared with the above.

In the embodiment, the straightening vane 10 is of a split type, and the lower end of the upper straightening vane 10 is the lower straightening vane 10.
In the case of being assembled to the straight pipe part of the hermetic heat exchanger so as to be overlapped with the outside of the upper end of the above, the sprayed water sprayed from the upper water tank is the air dedicated passage 11
It is possible to prevent invasion into the inside of the pipe, efficiently raise the temperature of the dry air, and install the straightening plate 10 to the straight pipe portion in a direction perpendicular to the axial direction of the straight pipe portion. That is, it can be performed from 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 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.

FIG. 4 is a plan view of an upper water tank of a second embodiment.

FIG. 5 is a plan view of an upper water tank of a third embodiment. [Brief Description of Drawings] A upper water tank 10 straightening plate 11 air-only passage 12 gas-liquid contact passage 20 partition plate

Claims (4)

[Claims] 1. An inside of an upper water tank of a cross flow type cooling tower is divided into at least two parts in a width direction of an outside air intake of this cooling tower by a vertical partition plate, and a plurality of upper and lower layers are vertically arranged below the upper water tank. Sealed heat exchangers are arranged, and circulating cooling water is flowing inside them. The straight pipes of these sealed heat exchangers are spaced apart in the axial direction and located directly below the partition plate. The straightening vanes are arranged at positions, and the air-only passage and the gas-liquid contact passage through which only air passes from the suction side to the discharge side are formed adjacent to and in parallel with each other with these straightening vanes as boundaries. A cross-flow type cooling tower. 2. The upper water tank is divided into two, a spray water supply pipe for supplying spray water is provided in one of the divided areas, and the partition plate also serves as a dam for the spray water. The cross-flow cooling tower according to claim 1. 3. A discharge port of a spray water pipe is opened in each of the compartments of the upper water tank, and at least one spray water pipe is provided with a throttle valve for adjusting a spray water amount. The cross-flow cooling tower according to claim 2. 4. The upper water tank is divided into two, the bottom area of one division area is made wider than the spray bottom area of the other division area, and an opening / closing valve is provided for each spray water pipe opening in each division area. The cross-flow cooling tower according to claim 3, wherein the cross-flow cooling tower is provided.