JP2001208486A - Air/water cooled cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air/water cooled cooling tower which reduces a set-up space, reduces consuming quantity of cooling water and power consumption, and can raise cooling effect even in the case where the outdoor temperature is high in summer. SOLUTION: The cooling tower is constituted with a blower 8, a water spray tank 11, a wet type heat exchanger 5, a lower water tank 10, a spraying water circulating pump 13 and the like. Process water returned from a loaded side is directed to the heat exchanger 4. Cooling is effected with spraying of water to the heat exchanger 4, and the sucked outdoor air. The tank 11 is provided with a partitioning plate 15. A water spray piping 12 is arranged so that spraying water is supplied only to an air sucking side 11A of the tank 11 which is defined by the plate 15. Thus, a wet part 4A and a dry part 4B are established in the heat exchanger 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-water-cooled cooling tower, and more particularly to a cooling tower generally used for air conditioning equipment and industrial equipment, in which the installation space can be reduced and the amount of spray water used for cooling and the amount of water used for cooling. The present invention relates to an air / water cooling tower capable of reducing power consumption and improving a cooling effect.

[0002]

2. Description of the Related Art Conventionally, cooling towers generally used for air conditioning equipment, industrial equipment and the like directly cool water using latent heat of vaporization of water. A large amount of cooling water is lost due to scattering, evaporation during heat exchange, etc., and a large amount of water needs to be replenished. With the increase in water supply, there is a problem that the amount of water supply increases and the running cost increases.

On the other hand, there is an air-cooling type cooling tower which does not require the supply of cooling water. In this air-cooled cooling tower, in the heat exchanger, sensible heat is exchanged between the air sucked from outside the tower body and the process water to cool the process water. There is an advantage that it is not required at all.

[0004]

However, while this air-cooled cooling tower has the advantage that no cooling water is required, the heat generated by the sensible heat between the air sucked from outside the tower main body and the process water is obtained. Since the heat exchange is performed, the heat exchange efficiency is low, and the surface area of the plate fins needs to be increased. Therefore, the capacity of the heat exchanger increases,
Following this, the cooling tower accommodating the heat exchanger also becomes large, and there is a problem that the installation area of the cooling tower becomes large. Also, the amount of air flowing through the large-capacity plate fin type heat exchanger increases, and the air pressure loss increases accordingly. Therefore, it is necessary to improve the capacity of the blower to compensate for this. As a result, there is a problem that power consumption increases, and initial costs and running costs increase. Furthermore, when the difference between the outside air temperature and the water temperature of the process water becomes small in summer or the like, the heat exchange efficiency decreases, and a large-capacity heat exchanger is required to obtain a required cooling capacity. There is a problem that the cooling tower accommodating the heat exchanger becomes larger, and the installation area of the cooling tower becomes larger.In addition, if the outside air temperature becomes higher than the water temperature of the process water, cooling becomes impossible. There was a problem.

The present invention has been made in view of the above-mentioned problems of the conventional closed-type cross-flow cooling tower and air-cooling cooling tower, and can reduce the installation space, reduce the amount of water used for cooling and power consumption, and reduce It is an object of the present invention to provide an air-water cooling tower capable of improving the cooling effect even when the outside air temperature is high.

[0006]

In order to achieve the above object, an air-water-cooled cooling tower according to the present invention comprises a blower, a water spray tank, a heat exchanger, a lower water tank, a pump for spraying water circulation, and the like. In the air-water-cooled cooling tower in which the returned process water is introduced into the heat exchanger and cooled by the water spray to the heat exchanger and the sucked outside air, a partition plate is arranged in the water spray tank, A spray water pipe is provided so as to supply spray water only to the air suction side of a water spray tank partitioned by a plate, and a wet type part and a dry type part are set in the heat exchanger.

[0007] In this air / water cooling type cooling tower, a partition plate is provided in a water spray tank, and a spray water pipe is provided so as to supply spray water only to the air suction side of the water spray tank partitioned by the partition plate. Since the heat exchanger is configured to have a wet section and a dry section, the air suction side of one heat exchanger can be used as a wet section and the air discharge side can be used as a dry section. , Heat exchange by latent heat in the wet section,
By performing heat exchange in combination with heat exchange by sensible heat in the dry section, heat exchange of process water can be efficiently performed. For this reason, a heat exchanger can be provided at a low cost, the piping in the tower can be simplified, the installation space can be reduced by reducing the size of the tower main body, the amount of cooling water used and the power consumption can be reduced, and the power consumption in summer can be reduced. Even when the temperature is high, the cooling effect can be improved.

In this case, the partition plate can be arranged so as to be adjustable in position, so that the ratio of the wet part to the dry part of the heat exchanger can be set arbitrarily.

Thus, the ratio of heat exchange by latent heat in the wet section and heat exchange by sensible heat in the dry section is arbitrarily changed according to the use condition of the cooling tower and the outside temperature which changes with the season. And the heat exchange of the process water can be performed more efficiently.

[0010] It is desirable that the water spray tank be formed to have a size up to a substantially intermediate position between the air suction side and the air discharge side of the heat exchanger.

[0011] Thus, even if the partition plate of the sprinkler tank is adjusted so that the area of the sprinkler tank is maximized, it is possible to secure a dry section particularly on the upper air discharge side of the heat exchanger, which is close to the blower. In addition, the spray water flowing down the wet portion can be prevented from passing through the dry portion and being scattered as water droplets.

An eliminator can be provided along the air discharge side of the heat exchanger.

Thus, the spray water flowing down the wet part is
It is possible to prevent the water from being scattered as water droplets through the dry part.

Further, a filling can be provided along the air suction side of the heat exchanger.

Thus, the temperature of the air sucked into the cooling tower (dry bulb temperature) and the temperature of the spray water can be reduced, and the heat exchange efficiency can be improved.

Further, the heat exchanger can be made of copper.

Thus, the corrosion of the heat exchanger having the wet and dry parts can be suppressed, the durability is improved, the structure is simplified, and the manufacturing cost of the heat exchanger can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the air / water cooling tower according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the air / water cooling type cooling tower of the present invention. As shown in FIG. 1, the tower main body 1 of the air / water cooling type cooling tower has air suction ports 2 for sucking air (outside air) as cooling air in the tower main body 1 on both side surfaces thereof. A filling 3 for lowering the temperature of the air sucked into the tower body 1 (dry-bulb temperature) and the temperature of the spray water from the air suction port 2 side toward the center of the tower. A heat exchanger 4 for circulating the process water to cool the process water, and a cooling water flowing down the heat exchanger 4 to the center side are formed by water passing through the heat exchanger 4 into water droplets inside the tower body 1. An eliminator 5 for removing so as not to be scattered is sequentially arranged symmetrically, a sprinkling tank 11 is disposed above the eliminator 5, and a blower casing formed so as to be joined to the tower main body 1 above this. Blower 8 in 7
By driving the blower 8 with the electric motor 9, air is sucked into the tower main body 1 from the air suction ports 2 on both sides of the tower, and is passed through the filling 3, the heat exchanger 4, and the eliminator 5 in order. The process water is efficiently cooled by causing the latent heat and the sensible heat to be exchanged with the process water in two stages to efficiently cool the process water, and from the center of the tower body 1 to the outside of the tower body 1 through the blower 8. It is configured to discharge the outside air sucked for cooling.

The spray water spraying device for spraying water to the heat exchanger 4 includes a lower water tank 10 provided at a lower portion of the tower body 1 and a water sprayer (not shown) provided at an upper portion as necessary. And a spray water pipe 12 provided with a spray water circulation pump 13 for supplying spray water from the lower water tank 10 to the water spray tank 11.
And

The inside of the water spray tank 11 is partitioned by a partition plate 15 into an outer chamber 11A on the air suction side and an inner chamber 11B on the air discharge side. The partition plate 15 arranges the inside of the water spray tank 11 so as to be adjustable in position between the air suction side and the air discharge side, and the outer chamber 11A on the air suction side of the water spray tank 11 partitioned by the partition plate 15. By arranging the spray water pipe 12 so as to supply only the spray water, the ratio of the wet section 4A where the spray water of the heat exchanger 4 is sprayed and the dry section 4B where the spray water is not sprayed is arbitrary. So that it can be set to A distribution tank (not shown) is connected to the end of the spray water pipe 12 for supplying the spray water, so that the spray water is uniformly split and supplied into the outer chamber 11A.

In this case, it is desirable that the water spray tank 11 be formed to have a size up to a substantially intermediate position between the air suction side and the air discharge side of the heat exchanger 4. Thereby, even if the partition plate 15 of the sprinkling tank 11 is adjusted so that the area of the sprinkling tank 11 is maximized, especially, the dry section 4B is surely formed on the upper air discharge side of the heat exchanger 4 near the blower 8. Can be secured, wet part 4
The spray water flowing down A can be prevented from passing through the dry section 4B and scattering as water droplets.

The heat exchanger 4 is composed of one heat exchanger 4
Is used as the wet portion 4A to which the spray water is to be sprayed and the dry portion 4B to which the spray water is not to be sprayed.

The spraying water circulation pump 13 senses the outside air temperature in its electric circuit by an outside air temperature sensor 14 disposed at an appropriate position such as the lower water tank 10 or the like, and the electric motor of the spraying water circulation pump or the electric motor of the blower 8. Is incorporated in the thermostat circuit (not shown). Thus, from the middle period when the outside air temperature decreases to the winter period, the thermostat circuit for control can be operated to stop the electric motor for the blower or the electric motor for the spraying water pump, thereby reducing the power consumption of these electric motors. As a result, the evaporation loss of the spray water can be reduced, and the amount of the spray water used can be reduced.

The spraying water pipe 12 branches on the way to supply spraying water to the spraying tanks 11 arranged on both sides of the upper part of the tower, and a three-way valve, for example,
A wax-type temperature control valve 18 is provided, a bypass pipe 17 connected to the lower water tank 10 is connected to the three-way valve 18, and when the temperature of the spray water decreases from the middle period when the outside air temperature decreases to the winter period, for example, 50% spray water with a three-way valve 18
Automatically opens and closes, directly bypasses the lower water tank 10, and adjusts the amount of spray water consumed for heat exchange by latent heat of the wet portion 4A of the heat exchanger 4, thereby disposing the spray water in the heat exchanger 4. It is configured such that the cooling temperature of the process water circulating in the pipeline can be adjusted.

Further, according to the temperature of the spray water, the surplus part of the spray water supplied to the spray tank 11 is directly bypassed to the lower water tank 10 via the three-way valve 18 and the bypass pipe 17, and the spray water is sprayed. Evaporation loss can be reduced, and the amount of spray water used can be reduced. In addition, the three-way valve 18 automatically changes its opening according to the temperature of the spray water.
Although it can be easily adjusted, it is also possible to use a three-way valve of a type other than the wax type temperature control valve.

Although not shown, the lower water tank 10 is provided with a ball tap to replenish the spray water reduced by evaporation or the like so that a constant amount of spray water is always maintained in the lower water tank 10 and its circulation path. I do.

Further, by connecting the process pipe 19 to the outlet of the process water of the heat exchanger 4 and the process pipe 20 to the inlet of the process water, the process water returned from the load side is passed through the process pipe 19. The heat is supplied to the heat exchanger 4 and then sent out again from the heat exchanger 4 to the load side via the process pipe 20. The process pipe 19 is provided with a temperature sensor 21 for detecting the temperature of the process water sent to the load side.

Next, the operation of the air / water cooling tower will be described. The spray water stored in the lower water tank 10 is rectified in the distribution tank via the spray water pipe 12 by driving the spray water circulation pump 13, and then introduced into the outer chamber 11A of the spray tank 11, Water is sprinkled directly from a sprinkling hole formed in the bottom of the outer chamber 11A or onto a sprinkler, and after being uniformly dispersed, the water flows down to the lower water tank 10 in the wet portion 4A of the heat exchanger 4. As a result, the surface of the pipe of the wet portion 4B of the heat exchanger 4 in which the process water is circulated is wetted, and is directly in contact with the air sucked from the air suction port 2 by the blower 8 to perform heat exchange by latent heat. At the same time, part of the spray water is evaporated by heat exchange, and
Will be introduced.

At this time, the spray water introduced into the outer chamber 11A of the water spray tank 11 also flows toward the lower water tank 10 through the filling 3 disposed along the air suction side of the heat exchanger 4. Flow down. As a result, the temperature of the air sucked from the air inlet 2 by the blower 8 (dry-bulb temperature) and the temperature of the spray water can be reduced, and the heat exchange efficiency can be improved.

In this way, the spray water flows down in the lower water tank 10, the outer chamber 11A of the water spray tank 11, the wet section 4A of the heat exchanger 4, and the filling 3 by driving the spray water circulation pump 13. When the process water returned from the load side circulates back into the lower water tank 10 and circulates through the heat exchanger 4, heat exchange by latent heat is performed in the wet part 4A of the heat exchanger 4, and then Then, heat exchange by sensible heat is performed in the dry section 4B of the heat exchanger 4, and the process water is cooled.

At this time, the spray water lost by evaporation is automatically replenished through a conventional water supply port through a ball tap or the like, and the amount of spray water is kept constant.

Also, since the wax-type three-way valve 18 is provided in the spray water pipe 12, when the outside air temperature decreases and the spray water temperature decreases, the wax-type three-way valve 18 opens so as to follow the spray water temperature. Then, a part of the spray water flows to the bypass pipe 17 via the wax type three-way valve 18 and is directly bypassed to the lower water tank 10. Further, when the temperature of the spray water decreases, the three-way valve is fully opened to spray the spray water. About 50% of the lower tank 1
It is then bypassed to 0, whereby the amount of spray water is adjusted.

In the electric circuit of the spray water circulation pump 13, the sensor 14 senses the outside air temperature to control the motor for the pump or the blower. When the sensing is performed, the electric motor is stopped to reduce the power consumption of the electric motor, and the evaporation loss of the spray water is reduced, so that the usage amount of the spray water can be reduced.

The air sucked into the tower main body 1 is heated by heat exchange when passing through the heat exchanger 4, and then finely contained in the air when passing through the eliminator 5. The water droplets are removed, and are discharged outside the cooling tower by the blower 8.

In this way, the spray water is circulated to cool required process water, and the process water can be cooled efficiently by heat exchange using latent heat and sensible heat.

Further, a partition plate 1 for partitioning the inside of the spraying tank 11 in accordance with the use condition of the cooling tower and the outside temperature which changes depending on the season.
By adjusting the position of the outer room 11A and the inner room 11
The ratio of B, that is, the ratio of the wet portion 4A and the dry portion 4B of the heat exchanger 4 is appropriately set, whereby heat exchange by latent heat in the wet portion 4A and heat exchange by sensible heat in the dry portion 4B are performed. Heat exchange by combining
Heat exchange of process water can be performed efficiently.

As described above, the air / water cooling tower of the present invention
Although described based on the embodiment, the present invention is not limited to the configuration described in the above embodiment, for example,
The configuration of the partition plate 15 for partitioning the inside of the spraying tank 11 can be appropriately changed without departing from the gist of the partition plate 15, for example.

[0039]

According to the air-water-cooled cooling tower of the present invention, the partition plate is provided in the water spray tank, and the spray water is supplied only to the air suction side of the water spray tank divided by the partition plate. Since a water pipe is connected and a wet section and a dry section are set in the heat exchanger, the air suction side of one heat exchanger is used as a wet section and the air discharge side is used as a dry section. Thereby, heat exchange by latent heat in the wet section and heat exchange by sensible heat in the dry section are performed to perform heat exchange, and heat exchange of process water can be efficiently performed. And since a wet part and a dry part can be comprised using one heat exchanger, a heat exchanger can be provided at low cost, the piping in a tower main body becomes simple, and the tower main body is reduced and its installation is performed. The space can be reduced, the amount of cooling water used and the power consumption can be reduced, and the cooling effect can be improved even when the outside air temperature in summer is high, so that the initial cost and running cost can be reduced. it can.

Further, the partition plate is disposed so as to be adjustable in position,
By configuring the heat exchanger so that the ratio of the wet part and the dry part can be set arbitrarily, heat exchange by latent heat in the wet part depends on the usage conditions of the cooling tower and the outside temperature that changes depending on the season. The heat exchange can be performed by arbitrarily changing the ratio of heat exchange by sensible heat in the dry section and the dry section, and the heat exchange of the process water can be performed more efficiently.

Further, by forming the sprinkler tank to a size approximately at the intermediate position between the air suction side and the air discharge side of the heat exchanger, the partition plate of the sprinkler tank is adjusted to maximize the area of the sprinkler tank. However, especially, a dry section can be secured on the upper air discharge side of the heat exchanger, close to the blower, and spray water flowing down the wet section is prevented from passing through the dry section and scattering as water droplets can do.

Further, by disposing the eliminator along the air discharge side of the heat exchanger, it is possible to prevent the spray water flowing down the wet section from passing through the dry section and being scattered as water droplets.

Further, by arranging the filling along the air suction side of the heat exchanger, the temperature of the air sucked into the cooling tower (dry bulb temperature) and the temperature of the spray water are reduced, and the heat exchange efficiency is reduced. Can be improved.

Further, by making the heat exchanger made of copper,
Corrosion of the heat exchanger in which the wet and dry parts are formed can be suppressed, durability can be improved, the structure can be simplified, and the manufacturing cost of the heat exchanger can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an air / water cooling tower according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tower main body 2 Air suction port 3 Filling 4 Heat exchanger 4A Wet type 4B Dry type 5 Eliminator 7 Blower casing 8 Blower 9 Blower motor 10 Lower water tank 11 Spray tank 11A Outer room 11B Inner room 12 Sprinkling water piping 13 Sprinkling Pump 14 Outside air temperature sensor 15 Partition plate 17 Bypass piping 18 Wax-type temperature control valve (three-way valve) 8 19, 20 Process piping

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Minoru Okada 3-3-3 Toyosu, Koto-ku, Tokyo Inside NTT Data Corporation (72) Inventor Toshihiro Nambu Toyosu 3-chome, Koto-ku, Tokyo No. 3 No. 3 NTT Data Corporation (72) Inventor Toshifumi Nakanishi 4-5-11 Higashiota, Ibaraki City, Osaka Prefecture Inside Hitachi Air Conditioning System Ibaraki Plant (72) Inventor Shozo Onishi Osaka Prefecture 4-5-11 Higashiota, Ibaraki-shi Hitachi Air Conditioning System Ibaraki Factory Co., Ltd. (72) Inventor Kazuyoshi Hayashinaka 4-5-11 Higashiota, Ibaraki-shi, Osaka Hitachi Air Conditioning System Ibaraki Factory Co., Ltd.

Claims (6)

[Claims] 1. A blower, a sprinkler tank, a heat exchanger, a lower water tank,
In the air-water-cooled cooling tower, which is configured with a spray water circulation pump or the like and introduces process water returning from the load side into the heat exchanger, so that water is sprayed to the heat exchanger and cooled by sucked outside air, A water spray tank is provided with a partition plate, and a spray water pipe is piped so as to supply spray water only to the air suction side of the water spray tank partitioned by the partition plate, and a wet part and a dry part are provided in the heat exchanger. An air-water-cooled cooling tower characterized by being configured to be set. 2. The heat exchanger according to claim 1, wherein the partition plate is arranged so as to be adjustable in position so that the ratio of the wet part to the dry part of the heat exchanger can be set arbitrarily. Air-water cooling tower. 3. The air-water-cooled cooling tower according to claim 1, wherein the water spray tank is formed to have a size up to a substantially intermediate position between the air suction side and the air discharge side of the heat exchanger. 4. The air / water cooling tower according to claim 1, wherein an eliminator is provided along an air discharge side of the heat exchanger. 5. A filling is provided along the air suction side of the heat exchanger.
The air / water cooling tower described. 6. The air / water cooling tower according to claim 1, wherein the heat exchanger is made of copper.