JPH0942861A - Cross flow type cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable execution of sufficient cooling in the summer period, rather weak fulfillment of a white smoke preventing function in the intermediate periods and rather strong fulfillment of this function in the winter period. SOLUTION: Circulating cooling water flow-down passages 10 and air-liquid contact passages 20 in a heat exchanger A shaped like a rectangular parallelepiped as a whole are partitioned by heat exchange partition plates 30. A main pipe 40 supplying the flow-down passages 10 with circulating cooling water from a load part is provided and a first water sprinkling pipe 41 joining this main pipe 40 is laid horizontally on the upper side of the heat exchanger A. Moreover, flow passages supplying the air-liquid contact passages 20 with the circulating cooling water are divided into two systems and the air-liquid contact passages 20a and 20b of the separate systems can be switched properly over to exclusive passages of air.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a cross-flow cooling tower,
In particular, the present invention relates to a cross-flow cooling tower having a white smoke generation preventing function.

[0002]

2. Description of the Related Art Various types of cross-flow cooling towers of this type have been developed, manufactured and sold.

[0003]

In the one for preventing the generation of white smoke in the winter in the cross flow type cooling tower, the white smoke generation preventing function is determined based on the winter season. However, there is a risk that the cooling capacity will become insufficient in the summer, and with the increase in size of the cooling tower, it is desirable to be able to exert appropriate functions according to the four seasons of Japan. The present invention solves the above-mentioned problems, can perform sufficient cooling in the summer, exerts a weak white smoke prevention function in the intermediate period, and in the winter,
It is an object of the present invention to provide a cross-flow cooling tower capable of exhibiting a white smoke prevention function more strongly to the market.

[0004]

In order to solve the above-mentioned problems, a specific invention is directed to a plurality of circulating vertical cooling water flow passages which are closed at both side edges and which are open vertically and are parallel to each other in a vertical direction. And a gas-liquid contact passage formed adjacent to the circulating cooling water flow passage and flowing in a cross-flow manner with the circulating cooling water and the air flow directly contacting each other. In a cross flow type cooling tower in which an atmosphere open type heat exchanger of a rectangular parallelepiped shape in which the gas-liquid contact passage is partitioned by a heat exchange partition plate is provided inside, circulating cooling water is supplied to the gas-liquid contact passage. The flow path is divided into at least two systems, and the gas-liquid contact passage of each system can be appropriately switched to a dedicated air passage.

In order to solve the above-mentioned problems, the related invention has a plurality of distribution pipes branching from a main pipe for supplying circulating cooling water from a load part to the flow-down passage, and several pipes extending from each sprinkling pipe. The water sprinkling pipe is inserted into the gas-liquid contact passage of each system, and each distribution pipe is provided with an opening / closing valve, which is a cross-flow cooling tower.

In order to solve the above-mentioned problems, in the related invention, a bypass pipe for flow rate adjustment is branched from a main pipe for supplying circulating cooling water from a load part to an upper water tank of the cross flow type cooling tower.
The bypass pipe is connected to a return pipe for returning the circulating cooling water from the lower water tank of the cross flow type cooling tower to the load section, and at least two kinds of positions having different heights and distribution openings are provided in the upper water tank. A sprinkler pipe is provided, and the sprinkler pipe extending from one of the two kinds of distribution pipes having different heights is a gas-liquid contact pipe of one of the gas-liquid contact passages divided into the two systems. The water spray pipe that is located in the contact passage and extends from the other distribution pipe is located in the gas-liquid contact passage of the other system, and is a cross-flow cooling tower.

In order to solve the above problems, according to the related invention, a flow control valve is provided in a supply pipe for supplying circulating cooling water to the upper water tank of the cross flow type cooling tower, and the bottom portion of the upper water tank has a stepped shape. At the bottom of the lowest stage, there is a distribution pipe that opens toward the flow passage, and at least two other stages except the lowest stage have gas-liquid contact of each system. A cross-flow type cooling tower is characterized in that a distribution pipe for supplying circulating cooling water to the passage communicates with the passage.

In order to solve the above-mentioned problems, the related invention has three chambers in which the upper water tank of a cross flow type cooling tower, which is supplied with circulating cooling water by a supply pipe, partitions at least three chambers by vertical weirs. At the bottom of one of the rooms, a distribution pipe that opens toward the flow passage is hung down, and the other 2
At the bottom of one room, a distribution pipe for supplying the circulating cooling water to the gas-liquid contact passage of each system hangs down, and in the supply pipe,
This is a cross-flow cooling tower characterized by being provided with a flow rate adjusting valve.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 This form is a typical embodiment of the invention described in claims 1 and 2. In FIG. 1 and FIG. 2, A is an air-releasing heat exchanger in the form of a rectangular parallelepiped, which is installed in a cross-flow cooling tower B, and has both side edges sealed and a flat vertical direction opened vertically. A plurality of circulation cooling water flow-down passages 10 parallel to each other and a circulation cooling water flow passage 10 formed adjacent to the circulation cooling water flow-down passage 10 are formed so that the circulation cooling water and air flow are in direct contact with each other and the circulation. Gas-liquid contact passage 2 in which cooling water and air flow directly contact each other and flow in a cross-flow manner
0, the flow-down passage 10 and the gas-liquid contact passage 20 are partitioned by a heat exchange partition plate 30. In this embodiment, the gas-liquid contact passage 20 is formed in a tunnel shape by closing the upper part of the heat exchange partition plate 30 which is a set of two fillers. Can be assembled and disassembled as a heat exchanger unit. Corrugated heat exchange wall plates 30 contacting each other in adjacent gas-liquid contact passages 20.
The downflow passage 10 is formed therebetween. A large number of irregularities are formed on the heat exchange wall plates 30 that are in contact with each other, and both side edges of the downflow passage 10 have a shape in which the outside airflow does not easily flow and are in a substantially sealed state. It may be sealed with a sealing tool (not shown) such as (see FIG. 7). The flow-down passage 10 and the gas-liquid contact passage 2
The ratio of 0 is about 1: 1 in this embodiment, but 1:
2, the flow-down passages 10 and the gas-liquid contact passages 20 may not necessarily be arranged alternately, and the flow-down passages 10 may be arranged with several gas-liquid contact passages 20 ( (See FIG. 8). A main pipe 40 for supplying the circulating cooling water from the load section to the downflow passage 10 is provided, and a first water sprinkling pipe 41 connected to the main pipe 40 is provided on an upper surface of the heat exchanger A having a substantially rectangular parallelepiped shape. It is plumbed horizontally. The flow path for supplying the circulating cooling water to the gas-liquid contact passage 20 is divided into two systems, and the gas-liquid contact passages 20a and 20b of each system can be appropriately switched to a dedicated air passage.

That is, of the two distribution pipes 42, 43 branched from the main body 40, several sprinkler pipes 42a extending horizontally from the first distribution pipe 42 are gas-liquid contact divided into the two systems. Gas-liquid contact passage 20 of one of the passages 20
Several water spray nozzles 43a which are located inside a and extend horizontally from the second distribution pipe 43 are the gas-liquid contact passages 20b of the other system.
It is located inside, and has sprinkler pipe 41 and distribution pipes 42, 43.
On-off valves 45, 46, 47 are provided in the. By operating the open / close valves 46, 47 of the first and second distribution pipes 42, 43, the gas-liquid contact passages 20a, 20b of each system can be appropriately switched to a dedicated air passage.

The operation of this mode is as follows. a) In summer, the on-off valves 46 and 47 are all opened, and high-temperature circulating cooling water sent from the load is sprayed on all of the gas-liquid contact passages 20 so as to be brought into direct contact with an external air flow, thereby causing latent heat of vaporization. Circulates the cooling water and sends it to the load for circulation. At this time, it is not necessary to dare to provide the high-temperature circulating cooling water to the downflow passage 10. b) In the intermediate period (spring, rainy season, autumn), the corresponding opening / closing of the supply of the circulating cooling water to the gas-liquid contact passage 20a (or 20b) of one of the two gas-liquid contact passages 20 is performed. It is stopped by closing the valve 46 (or 47), the gas-liquid contact passage 20a (or 20b) is used as an air-only passage, and the high-temperature circulating cooling water flowing through the flow-down passage is indirectly provided by the external airflow flowing through the air-only passage. The outside airflow is made into dry air while being cooled to. The circulating cooling water supplied to the gas-liquid contact passage 20b (or 20a) of the other system comes into direct contact with the outside air flow and is cooled by the latent heat of vaporization, and this outside air temperature rises itself to become moist air. The circulating cooling water flowing through the downflow passage 10 is indirectly cooled by the heated moist air and exhibits a cooling capacity of about 50% to 78% as compared with the cooling capacity in the summer.
The dry air and the moist air are passed through the exhaust port 4 of the cross-flow cooling tower B.
4 The air is mixed in the ventilation chamber 48 provided below, and is exhausted to the atmosphere without being made into supersaturated air, that is, without white smoke. c) In the winter season, the on-off valves 46 and 47 are all closed to stop the supply of the circulating cooling water to all the gas-liquid contact passages 20 to make them air-only passages, and only the downflow passages 10 are fed from the load part. The hot circulating cooling water is supplied, and the circulating cooling water is indirectly cooled by the outside airflow flowing through the air passage, and the outside airflow is heated with the absolute humidity kept constant, and the exhaust port is used as dry air. Exhaust with less white smoke. In addition, the first of FIG.
The water sprinkling pipe 41 is laid along the upper part of the heat exchange pipe A, but may be laid in the upper end opening of the downflow passage 10 (see FIG. 9).

Embodiment 2 This embodiment is a typical embodiment of the invention described in claim 3. The same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and the structures different from those in the first embodiment are as follows. A bypass pipe 50 is branched from a main pipe 40 that supplies the circulating cooling water from the load part to the upper water tank C of the cross-flow cooling tower B, and the bypass pipe 50 extends from the lower water tank D of the cross-flow cooling tower B. The bypass pipe 5 is connected to the return pipe 51 that returns the circulating cooling water to the load part.
0 is provided with an opening / closing valve 52, and the upper water tank C is provided with two vertical distribution pipes 53, 54 having different heights and penetrating through the bottom portion thereof. That is, each distribution pipe 53, 5
4 are arranged so that the open positions of the upper end of 4 are vertically different from each other (see FIG. 3). There are 2 distribution pipes with different heights.
The number of distribution pipes is not limited to a book, and five distribution pipes 53, 54, 56, 57, 5 having different heights as shown in FIGS.
8 may be piped. A large number of holes 55 for supplying the circulating cooling water to the downflow passage 10 are provided at the bottom of the upper water tank C, and one of the two vertical distribution pipes 53, 54 having different heights is used. The water spray pipe 53a extending horizontally from the gas-liquid contact passage 2 is divided into the two systems.
No. 0, which is located in the gas-liquid contact passage 20a of one system, and horizontally extends from the other water spray pipe 54.
Is located in the gas-liquid contact passage 20b of the other system.

The operation of this mode will be described below. a) In the summer, the circulation cooling water flowing into the bypass pipe 50 is shut off, and all the high temperature circulation cooling water sent from the load section is supplied to the upper water tank C, and the downflow passage 10 and the gas-liquid contact. Passage 2
This circulating cooling water is distributed and supplied to 0, and the outside airflow and the circulating cooling water directly contact with each other in the gas-liquid contact passage to cool by the latent heat of vaporization, and the circulating cooling water flowing down the downflow passage 10 is the outside airflow. Indirect cooling is performed, and all the circulating cooling water cooled in this way is returned to the load section through the return pipe and is circulated for use. In this way, the cooling capacity of the cross-flow cooling tower is increased to 10
Show 0%. b) In the intermediate period, part of the hot circulating cooling water from the load part is bypassed by the bypass pipe 60.
The supply amount of the circulating cooling water to the upper water tank C is reduced as compared with that in the summer, and the supply from the highest distribution pipe 53 to the gas-liquid contact passage 20a to one system is stopped. 20a is used as an air-only passage 20b, circulation cooling water is supplied to the gas-liquid contact passage 10 of the other system and the downflow passage, and the high-temperature circulation cooling water flowing through this downflow passage is indirectly connected by an outside airflow flowing through this air-only passage. And the external airflow flowing through the gas-liquid contact passage 20b of the other system to which the circulating cooling water is supplied is the same as the high-temperature circulating cooling water. The circulating cooling water is directly contacted with the latent heat of vaporization to cool the circulating cooling water, and the temperature of the circulating cooling water rises to become moist air. The dry air and the moist air are mixed in the ventilation chamber of the cooling tower B and exhausted to the atmosphere without becoming supersaturated air, that is, without white smoke. At this time, the cooling capacity of the cooling tower A is 50% to 7% of the cooling capacity in the summer.
It is about 0%. c) In the winter, the flow rate of the circulating cooling water passing through the bypass pipe 50 is increased as compared with that in the intermediate period, and the water level of the circulating cooling water in the upper water tank C is made lower than the upper end of the distribution pipe 54 at the lowest level, so that the circulating cooling water is All gas-liquid contact passages 2 are supplied only in the downflow passage 10.
0 is switched to a passage for exclusive use of air, the circulating cooling water is indirectly cooled by the outside airflow flowing through these passages for exclusive use of air 10 and the absolute humidity is kept constant, and this outside airflow is heated to maximize the amount of dry air generated. The exhaust air is exhausted to the atmosphere without white smoke. In addition, the circulating cooling water indirectly cooled by the external air flow is sent to the load section through the return pipe and used for circulation.

Embodiment 3 This embodiment is a typical embodiment of the invention described in claim 4. The components having the same reference numerals as those of the first embodiment have the same configuration and operation as those of the first embodiment, and the structures different from those of the first embodiment are as follows. The main pipe 40 for supplying the circulating cooling water to the upper water tank C of the cross-flow cooling tower B is provided with a flow control valve 61. The bottom portion of the upper water tank C is formed in a stepped shape, and the bottom portion of the lowermost stage 67 is provided with a sprinkling hole portion 62 which is a kind of distribution pipe opening toward the downflow passage. Other than at least two stepped portions 63,
Distribution pipes 65 and 66 for supplying circulating cooling water to the gas-liquid contact passages of the respective systems communicate with the bottom of 64 (see FIG. 5).

The operation of this mode is as follows. a) In the summer, the flow rate adjusting valve 61 is opened, the water level in the upper water tank C is set to the maximum water level, all the steps 67, 63, 64 are submerged, and the flow passage and all the gas-liquid contact passages 20 are divided into the above-mentioned portions. Piping 6
5,66, 100% cooling capacity of the cooling tower
Demonstrate. b) In the intermediate period, the flow rate adjusting valve 61 is throttled to lower the water level in the upper water tank C, and the circulating cooling water is passed through the water spray hole 62 and the distribution pipe 65 to the gas-liquid contact passage and the downflow passage of the one system. Supply,
The supply of the circulating cooling water from the distribution pipe 66 to the gas-liquid contact passage of the other system is cut off to provide a dedicated air passage. The outside air flow flowing through the dedicated air passage and the high-temperature circulating cooling water flowing through the downflow passage are indirectly contacted with each other, and the high-temperature circulating cooling water is cooled by the outside air flow. It becomes dry air. Wet air generated from the gas-liquid contact passage of one system and this dry air are mixed in the ventilation chamber,
Exhaust without white smoke without oversaturated air. c) In the winter season, the flow rate adjusting valve 61 is further narrowed down, the water level in the upper water tank C is set to the lowest level, all the circulating cooling water is supplied only to the downflow passage, and all the gas-liquid contact passages are used as the dedicated air passages, Maximize the amount of dry air generated and prevent white smoke.

Embodiment 4 This embodiment is a typical embodiment of the invention described in claim 5. The components having the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and the structures different from the first embodiment are as follows. The inside of the upper water tank C of the cross flow type cooling tower B to which the circulating cooling water is supplied by the main pipe 40 is partitioned by weirs 84 and 85 perpendicular to at least three chambers 81, 82 and 83, and three chambers 81 and 82 are provided. , 83, a sprinkler pipe 86 that opens toward the flow-down passage is hung at the bottom of one chamber 81, and the bottoms of the other two chambers 82, 83 circulate in the gas-liquid contact passages of each system. Distribution pipes 87 and 88 for supplying the cooling water hang down, and a flow rate adjusting valve 89 is provided in the supply pipe 40 (see FIG. 6).

The operation of this mode is as follows. a) In the summer, the flow rate adjusting valve 89 is fully opened, the water level in the upper water tank C is set to the maximum water level, and the circulating cooling water is supplied to all the gas-liquid contact passages and the downflow passages from all the chambers 81, 82, 83. Supply,
Cool the circulating cooling water sufficiently. b) In the intermediate period, the flow control valve 89 is throttled to reduce the inflow amount of the circulating cooling water into the upper water tank C, and the weirs 84, 85 are used to select one of the three chambers 81, 82, 83 from the one shown in the figure. The water supply to the leftmost room 83 is stopped, the circulating cooling water is not supplied to the gas-liquid contact passage of the other system, and the gas-liquid contact passage of the other system is used as a dedicated air passage. At this time, circulating cooling water is supplied from one of the chambers 81 and 82 to the gas-liquid contact passage of one system and the downflow passage. Indirect contact between the outside airflow flowing through this air passage and the high-temperature circulating cooling water flowing through the downflow passage,
The high temperature circulating cooling water is cooled by this outside air flow, and the outside air flow rises in temperature to become dry air having a constant absolute humidity. The humid air generated from the gas-liquid contact passage of one system and the dry air are mixed in the ventilation chamber, and are exhausted without white smoke. c) In the winter, the flow control valve 89 is further throttled to minimize the amount of circulating cooling water flowing into the upper water tank C, and the three chambers 81, 82, 8 are
Of the three, the two rooms 82, 83 where the distribution pipes 87, 88 for the gas-liquid contact passages are suspended are vacant rooms, and circulating cooling water is not supplied to all the gas-liquid contact passages. ,
Circulating cooling water is supplied only to the downflow passage 10 from the water sprinkling pipe 86 communicating with the remaining one chamber 81, and the maximum amount of dry air is generated to prevent the generation of white smoke.

[0018]

The effect of the invention described in claim 1 will be explained together with the effect of the invention described in claim 2. In summer, high-temperature circulating cooling water sent from the load section is sprayed on all of the gas-liquid contact passages, brought into direct contact with the outside air flow, and cooled by the latent heat of vaporization to send the cooling water to the load section. Can be used cyclically. During the intermediate period (spring, rainy season, autumn), the supply of the circulating cooling water to the gas-liquid contact passage of one of the two gas-liquid contact passages is stopped, and the gas-liquid contact passage is moved through the gas-liquid contact passage. A dedicated passage, in which the high-temperature circulating cooling water flowing through the downflow passage is indirectly cooled by an outside airflow flowing through the dedicated air passage, and the outside airflow can be made into dry air. Circulating cooling water can be supplied to the contact passage to generate humid air. The dry air and the humid air can be mixed in a ventilation chamber provided below the exhaust port of the crossflow cooling tower, and can be exhausted to the atmosphere without supersaturated air, that is, without white smoke.

Further, the circulating cooling water supplied to the gas-liquid contact passage of the other system can be directly brought into contact with the outside air stream to be cooled by the latent heat of vaporization, and the circulating cooling water flowing through the descending passage can be conveyed by the outside air stream. It can be indirectly cooled, and can exhibit a cooling capacity of about 50% to 78% as compared with the cooling capacity in the summer. In winter, the supply of the circulating cooling water to all the gas-liquid contact passages is stopped, and a passage dedicated to the air is provided.The high-temperature circulating cooling water sent from the load section is supplied only to the downflow passage, and the passage dedicated to the air is provided. In addition to indirect cooling of the circulating cooling water by the external airflow flowing through the airflow, the external airflow is heated at a constant absolute humidity, and can be exhausted as dry air from the exhaust port without white smoke.

The effect of the invention according to claim 2 will be described. In summer, all of the on-off valves are opened, high-temperature circulating cooling water sent from the load section is sprayed on all of the gas-liquid contact passages, and the circulating cooling water is brought into direct contact with the outside air flow, thereby circulating the circulating cooling water by the latent heat action of vaporization. It can be cooled and sent to the load section for circulation. In the intermediate period (spring, rainy season, autumn), the supply of the circulating cooling water to the gas-liquid contact passage of one of the two systems is stopped by closing the corresponding on-off valve. , This gas-liquid contact passage is used as a dedicated air passage,
The high-temperature circulating cooling water flowing through the downflow passage can be indirectly cooled by the outside airflow flowing through the air-only passage and the outside airflow can be made into dry air, and to the gas-liquid contact passage of the other system, Circulating cooling water can be supplied to generate moist air. The dry air and the humid air can be mixed in a ventilation chamber provided below the exhaust port of the crossflow cooling tower, and can be exhausted to the atmosphere without supersaturated air, that is, without white smoke.

Further, the circulating cooling water supplied to the gas-liquid contact passage of the other system can be directly contacted with the outside air stream to be cooled by the latent heat of vaporization, and the circulating cooling water flowing through the descending passage can be conveyed through the outside air stream. It can be indirectly cooled, and can exhibit a cooling capacity of about 50% to 78% as compared with the cooling capacity in the summer. In winter, the supply of the circulating cooling water to all the gas-liquid contact passages is stopped by closing all of the on-off valves, and a dedicated air passage is provided. And indirectly cools the circulating cooling water with the external airflow flowing through the air passage, heats the external airflow at a constant absolute humidity, and exhausts it as dry air without white smoke from the exhaust port. can do.

Next, the effect of the invention described in claim 3 will be described. In the summer, all the high-temperature circulating cooling water sent from the load part is supplied to the upper water tank, and the circulating cooling water is distributed and supplied to the downflow passage and the gas-liquid contact passage,
In the gas-liquid contact passage, the outside airflow and the circulating cooling water are in direct contact with each other to cool by the latent heat of vaporization, and the circulating cooling water flowing down the downflow passage is indirectly cooled with the outside airflow and passed through the return pipe to the load part. It can be returned and reused, and 100% of the cooling capacity of the cross flow type cooling tower can be exhibited. In the interim period, a part of the high-temperature circulating cooling water from the load section is passed through the bypass pipe to reduce the amount of circulating cooling water supplied to the upper water tank compared to the summer period, and the highest distribution pipe goes to one system. Supply to the gas-liquid contact passage of, the passage is used as an air-only passage, and circulation cooling water is supplied to the gas-liquid contact passage of the other system and the downflow passage to dry the outside airflow flowing through the air-only passage. As air, the outside airflow flowing through the gas-liquid contact passage of the other system to which the circulating cooling water is supplied is moist air, and the dry air and the moist air are mixed in the ventilation chamber so as not to become supersaturated air, that is, white. It can be vented to the atmosphere without smoke.
At this time, the cooling capacity of the cooling tower is 50% of the cooling capacity in the summer.
% To about 70%

In the winter season, the flow rate of the circulating cooling water through the bypass pipe is increased as compared with that in the intermediate period, the water level of the circulating cooling water in the upper water tank is set lower than the upper end of the lowest distribution pipe, and the circulating cooling water flows down. Supply only into the passage, switch all gas-liquid contact passages to dedicated air passages, keep the outside airflow flowing through these dedicated air passages at a constant absolute humidity, and heat them with high-temperature circulating cooling water to produce dry air. The room can be vented to the atmosphere without white smoke. In addition, the circulating cooling water indirectly cooled by the external air flow can be sent to the load portion through the return pipe and used for circulation.

According to the fourth aspect of the present invention, in the summer, the flow rate adjusting valve is opened, the water level in the upper water tank is set to the maximum water level, all the stepped portions are submerged, and the downflow passage and all the gas-liquid liquids. Water can be sprinkled in the contact passage through the distribution pipe to achieve 100% cooling capacity of the cooling tower. In the intermediate period, the flow control valve is throttled, the water level of the upper water tank is lowered, and circulating cooling water is supplied through a distribution pipe to the gas-liquid contact passage and the downflow passage of the one system, and the other system is supplied. The supply of circulating cooling water to the gas-liquid contact passage is shut off, and as the air-only passage, dry air generated from this air-only passage and wet air generated from one of the gas-liquid contact passages are mixed in the ventilation chamber. It can be exhausted without white smoke without supersaturated air. In the winter, the flow control valve is further throttled, the water level in the upper water tank is set to the lowest level, all the circulating cooling water is supplied only to the downflow passage, and all the gas-liquid contact passages are used as the exclusive air passages, and the dry air The amount of generation can be maximized and the generation of white smoke can be prevented.

The effect of the invention described in claim 5 will be described below. In the summer, the water level in the upper water tank is set to the maximum water level, and the circulating cooling water is supplied to all the gas-liquid contact passages and the downflow passages to sufficiently cool the circulating cooling water. In the interim period, the inflow amount of the circulating cooling water to the upper water tank is reduced, and the weir creates an empty room in which the circulating cooling water is not supplied in the other gas-liquid contact passage of the three chambers. As an air passage, dry air is generated, circulating cooling water is supplied to one gas-liquid contact passage and a downflow passage, and the moist air generated from one gas-liquid contact passage and the dry air are mixed in the ventilation chamber. ,
It can be exhausted without white smoke. In the winter, minimize the amount of circulating cooling water flowing into the upper water tank, do not supply circulating cooling water to all gas-liquid contact passages, use only air passages, and supply circulating cooling water only to the downflow passage to dry It can generate the maximum amount of air and prevent the generation of white smoke.
The advantage of the first embodiment is that the gas-liquid contact passage 2
Heat exchange partition plate 30 which is a set of two fillers forming 0
Since it can be assembled and disassembled as a heat exchange unit,
By increasing or decreasing the number of units according to the cooling capacity, the desired cooling capacity and white smoke generation preventing function can be exhibited.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a schematic front view of a second embodiment.

FIG. 4 is a plan view showing an indirect heat exchanger part in FIG. 3;

FIG. 5 is a schematic diagram of an upper water tank according to a third embodiment.

FIG. 6 is a schematic diagram of an upper water tank according to a fourth embodiment.

FIG. 7 is a schematic plan view showing another heat exchanger part.

FIG. 8 is a schematic plan view showing another heat exchanger part.

FIG. 9 is a schematic side view showing another sprinkling pipe.

10 is a schematic front view similar to FIG. 3 but partially omitted.

FIG. 11 is a plan view showing an indirect heat exchanger part of FIG. 10;

[Explanation of symbols]

 A Indirect heat exchanger B Cross flow type cooling tower 10 Circulating cooling water flow passage 20 Gas-liquid contact passage

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[Procedure amendment]

[Submission date] September 13, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

In order to solve the above-mentioned problems, the specified invention is such that both side edges are hermetically closed, and a plurality of vertically circulating flat cooling water flow passages parallel to each other are provided. A circulating liquid cooling water flow passage and a circulating liquid cooling air flow passage that directly contact with each other and flow in a cross-flow manner. In a cross flow type cooling tower in which an atmosphere open type heat exchanger in the shape of a rectangular parallelepiped in which a gas-liquid contact passage is partitioned by a heat exchange partition plate is provided inside, circulating cooling water is supplied to the gas-liquid contact passage. The cross-flow cooling tower is characterized in that the flow passage is divided into at least two systems, and the gas-liquid contact passage of each system can be appropriately switched to a dedicated air passage.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

Embodiment 1 This embodiment is a typical embodiment of the invention described in claims 1 and 2. In FIG. 1 and FIG. 2, A is an air-releasing heat exchanger in the form of a rectangular parallelepiped, which is installed in a cross-flow cooling tower B, and has both side edges sealed and a flat vertical direction opened vertically. and several circulating cooling water flow under passage 10 parallel to each other, through the circulation cooling water flow under the formed adjacent to the passage 10 both the circulation cooling water and air flow in direct contact with each other cross-flow Has a gas-liquid contact passage 20,
Each gas-liquid contact passage 20 is divided by a heat exchange partition plate 30 from the flow-down passage 10 and the gas-liquid contact passage 20 in which two adjacent filling plates 30 are not arranged vertically with a space. In this embodiment, the gas-liquid contact passage 20 is provided.
Among them, in the uppermost one, the upper part of the heat exchange partition plate 30 which is a set of two fillers is closed. The flow-down passage 10 is formed between the adjacent gas-liquid contact passages 20 and the heat exchange wall plates 30. Therefore, the downflow passages 10 in all stages are in a state of being communicated with each other by the connecting body 21 like the gas-liquid contact passage 20. Since a large number of irregularities are formed on the adjacent filling plates 30, both side edges of the downflow passage 10 have a shape in which the outside airflow does not easily flow and are in a substantially sealed state.
If necessary, both side edges may be sealed with a sealing device (not shown) such as a clip (see FIG. 7). The ratio of the flow-down passages 10 to the gas-liquid contact passages 20 is approximately 1: 1 in this embodiment, but may be 1: 2. Further, the flow-down passages 10 and the gas-liquid contact passages 20 are not necessarily arranged alternately. In some cases, the flow-down passages 10 are arranged with a plurality of gas-liquid contact passages 20 (see FIG. 8). A main pipe 40 for supplying the circulating cooling water from the load section to the downflow passage 10 is provided, and a first water sprinkling pipe 41 connected to the main pipe 40 is provided on an upper surface of the heat exchanger A having a substantially rectangular parallelepiped shape. It is plumbed horizontally. The flow path for supplying the circulating cooling water to the gas-liquid contact passage 20 is divided into two systems, and the gas-liquid contact passages 20a and 20b of each system can be appropriately switched to a dedicated air passage.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The operation of this mode is as follows. a) In summer, the on-off valves 46 and 47 are all opened, and high-temperature circulating cooling water sent from the load is sprayed on all of the gas-liquid contact passages 20 so as to be brought into direct contact with an external air flow, thereby causing latent heat of vaporization. Circulates the cooling water and sends it to the load for circulation. At this time, it is not necessary to dare to provide the high-temperature circulating cooling water to the downflow passage 10. b) In the intermediate period (spring, rainy season, autumn), the corresponding opening / closing of the supply of the circulating cooling water to the gas-liquid contact passage 20a (or 20b) of one of the two gas-liquid contact passages 20 is performed. It is stopped by closing the valve 46 (or 47), the gas-liquid contact passage 20a (or 20b) is used as an air-only passage, and the high-temperature circulating cooling water flowing through the flow-down passage is indirectly provided by the external airflow flowing through the air-only passage. The outside airflow is made into dry air while being cooled to. The circulating cooling water supplied to the gas-liquid contact passage 20b (or 20a) of the other system comes into direct contact with the outside air flow and is cooled by the latent heat of vaporization, and this outside air temperature rises itself to become moist air. The circulating cooling water flowing through the downflow passage 10 is indirectly cooled by the heated moist air and exhibits a cooling capacity of about 50% to 78% as compared with the cooling capacity in the summer.
The dry air and the moist air are passed through the exhaust port 4 of the cross-flow cooling tower B.
4 The air is mixed in the ventilation chamber 48 provided below, and is exhausted to the atmosphere without being made into supersaturated air, that is, without white smoke. c) In the winter season, the on-off valves 46 and 47 are all closed to stop the supply of the circulating cooling water to all the gas-liquid contact passages 20 to make them air-only passages, and only the downflow passages 10 are fed from the load part. The hot circulating cooling water is supplied, and the circulating cooling water is indirectly cooled by the outside airflow flowing through the air passage, and the outside airflow is heated with the absolute humidity kept constant, and the exhaust port is used as dry air. Exhaust with less white smoke. In addition, the first of FIG.
The water sprinkling pipe 41 is laid along the upper part of the heat exchanger A , but it may be laid in the upper end opening of the downflow passage 10 (see FIG. 9).

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Embodiment 2 This embodiment is a typical embodiment of the invention described in claim 3. The same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and the structures different from those in the first embodiment are as follows. A bypass pipe 50 is branched from a main pipe 40 that supplies the circulating cooling water from the load part to the upper water tank C of the cross-flow cooling tower B, and the bypass pipe 50 extends from the lower water tank D of the cross-flow cooling tower B. The bypass pipe 5 is connected to the return pipe 51 that returns the circulating cooling water to the load part.
0 is provided with an opening / closing valve 52, and the upper water tank C is provided with two vertical distribution pipes 53, 54 having different heights and penetrating through the bottom portion thereof. That is, each distribution pipe 53, 5
4 are arranged so that the open positions of the upper end of 4 are vertically different from each other (see FIG. 3). There are 2 distribution pipes with different heights.
The number of distribution pipes is not limited to a book, and five distribution pipes 53, 54, 56, 57, 5 having different heights as shown in FIGS.
8 may be piped. A large number of holes 55 for supplying the circulating cooling water to the downflow passage 10 are provided at the bottom of the upper water tank C, and one of the two vertical distribution pipes 53, 54 having different heights is used. The water spray pipe 53a extending horizontally from the gas-liquid contact passage 2 is divided into the two systems.
No. 0, which is located in the gas-liquid contact passage 20a of one system, and which horizontally extends from the other distribution pipe 54a
Is located in the gas-liquid contact passage 20b of the other system.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Embodiment 2 This embodiment is a typical embodiment of the invention described in claim 3. The same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and the structures different from those in the first embodiment are as follows. A bypass pipe 50 is branched from a main pipe 40 that supplies the circulating cooling water from the load part to the upper water tank C of the cross-flow cooling tower B, and the bypass pipe 50 extends from the lower water tank D of the cross-flow cooling tower B. The bypass pipe 5 is connected to the return pipe 51 that returns the circulating cooling water to the load part.
0 is provided with an opening / closing valve 52, and the upper water tank C is provided with two vertical distribution pipes 53, 54 having different heights and penetrating through the bottom portion thereof. That is, each distribution pipe 53, 5
4 are arranged so that the open positions of the upper end of 4 are vertically different from each other (see FIG. 3). There are 2 distribution pipes with different heights.
The number of distribution pipes is not limited to a book, and five distribution pipes 53, 54, 56, 57, 5 having different heights as shown in FIGS.
8 may be piped. A large number of holes 55 for supplying the circulating cooling water to the downflow passage 10 are provided at the bottom of the upper water tank C, and one of the two vertical distribution pipes 53, 54 having different heights is used. The water spray pipe 53a extending horizontally from the gas-liquid contact passage 2 is divided into the two systems.
No. 0, which is located in the gas-liquid contact passage 20a of one system, and which horizontally extends from the other distribution pipe 54a
Is located in the gas-liquid contact passage 20b of the other system.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The operation of this mode will be described below. a) In the summer, the circulation cooling water flowing into the bypass pipe 50 is shut off, and all the high temperature circulation cooling water sent from the load section is supplied to the upper water tank C, and the downflow passage 10 and the gas-liquid contact. Passage 2
This circulating cooling water is distributed and supplied to 0, and the outside airflow and the circulating cooling water directly contact with each other in the gas-liquid contact passage to cool by the latent heat of vaporization, and the circulating cooling water flowing down the downflow passage 10 is the outside airflow. Indirect cooling is performed, and all the circulating cooling water cooled in this way is returned to the load section through the return pipe and is circulated for use. In this way, the cooling capacity of the cross-flow cooling tower is increased to 10
Show 0%. b) In the intermediate period, part of the high-temperature circulating cooling water from the load part is bypass pipe 50
The supply amount of the circulating cooling water to the upper water tank C is reduced as compared with that in the summer, and the supply from the highest distribution pipe 53 to the gas-liquid contact passage 20a to one system is stopped. 20a is a passage exclusively for air, and a gas-liquid contact passage of the other system
Circulation cooling water is supplied to 20b and the downflow passage 10 , and the high-temperature circulation cooling water flowing through the downflow passage 10 is indirectly cooled by the outside airflow flowing through the air-only passage, and the outside airflow is kept at a constant absolute humidity. Warm it to dry air,
Gas-liquid contact passage 20 of the other system to which the circulating cooling water is supplied
The outside airflow flowing through b directly contacts the high-temperature circulating cooling water, cools the circulating cooling water by the latent heat effect of vaporization, and heats itself to become moist air, which indirectly inverts the high-temperature circulating cooling water flowing through the downflow passage 10. Cool to. The dry air and the moist air are mixed in the ventilation chamber of the cooling tower B and exhausted to the atmosphere without becoming supersaturated air, that is, without white smoke. At this time, the cooling capacity of this cooling tower B is 5 times that of the cooling capacity in the summer.
It is about 0% to 70%. c) In the winter, the flow rate of the circulating cooling water passing through the bypass pipe 50 is increased as compared with that in the intermediate period, and the water level of the circulating cooling water in the upper water tank C is made lower than the upper end of the distribution pipe 54 at the lowest level, so that the circulating cooling water is All gas-liquid contact passages 2 are supplied only in the downflow passage 10.
0 is switched to a passage for exclusive use of air, the circulating cooling water is indirectly cooled by the outside airflow flowing through these passages for exclusive use of air 10 and the absolute humidity is kept constant, and this outside airflow is heated to maximize the amount of dry air generated. The exhaust air is exhausted to the atmosphere without white smoke. In addition, the circulating cooling water indirectly cooled by the external air flow is sent to the load section through the return pipe and used for circulation.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

The operation of this mode is as follows. a) In the summer, the flow rate adjusting valve 61 is opened, the water level in the upper water tank C is set to the maximum water level, all the steps 67, 63, 64 are submerged , and the distribution pipe is provided in the downflow passage and all gas-liquid contact passages. 65, 6
Circulating cooling water is supplied through 6 to increase the cooling capacity of the cooling tower to 1
Demonstrate 00%. b) In the intermediate period, the flow rate adjusting valve 61 is throttled to lower the water level in the upper water tank C, and the circulating cooling water is passed through the water spray hole 62 and the distribution pipe 65 to the gas-liquid contact passage and the downflow passage of the one system. Supply,
The supply of the circulating cooling water from the distribution pipe 66 to the gas-liquid contact passage of the other system is cut off to provide a dedicated air passage. The outside air flow flowing through the dedicated air passage and the high-temperature circulating cooling water flowing through the downflow passage are indirectly contacted with each other, and the high-temperature circulating cooling water is cooled by the outside air flow. It becomes dry air. Wet air generated from the gas-liquid contact passage of one system and this dry air are mixed in the ventilation chamber,
Exhaust without white smoke without oversaturated air. c) In the winter season, the flow rate adjusting valve 61 is further throttled to set the water level in the upper water tank C to the lowest level, and all the circulating cooling water is supplied to the sprinkling hole portion 62.
Supplying only et rundown path, all of the gas-liquid contact passage and the air-only passage, the maximum amount of generation of dry air, to prevent the occurrence of white smoke.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The operation of this mode is as follows. a) In the summer, the flow rate adjusting valve 89 is fully opened, the water level in the upper water tank C is set to the maximum water level, and the circulating cooling water is supplied to all the gas-liquid contact passages and the downflow passages from all the chambers 81, 82, 83. Supply,
Cool the circulating cooling water sufficiently. b) In the intermediate period, the flow control valve 89 is throttled to reduce the inflow amount of the circulating cooling water into the upper water tank C, and the weirs 84, 85 are used to select one of the three chambers 81, 82, 83 from the one shown in the figure. The water supply to the leftmost room 83 is stopped, the circulating cooling water is not supplied to the gas-liquid contact passage of the other system, and the gas-liquid contact passage of the other system is used as a dedicated air passage. At this time, circulating cooling water is supplied from one of the chambers 81 and 82 to the gas-liquid contact passage of one system and the downflow passage. Indirect contact between the outside airflow flowing through this air passage and the high-temperature circulating cooling water flowing through the downflow passage,
The high temperature circulating cooling water is cooled by this outside air flow, and the outside air flow rises in temperature to become dry air having a constant absolute humidity. The humid air generated from the gas-liquid contact passage of one system and the dry air are mixed in the ventilation chamber, and are exhausted without white smoke. c) In the winter, the flow control valve 89 is further throttled to minimize the amount of circulating cooling water flowing into the upper water tank C, and the three chambers 81, 82, 8 are
Of the three, the two rooms 82, 83 where the distribution pipes 87, 88 for the gas-liquid contact passages are suspended are vacant rooms, and circulating cooling water is not supplied to all the gas-liquid contact passages. ,
Circulating cooling water is supplied from the sprinkling pipe 86 communicating with the remaining one room 81 only to the downflow passage to generate the maximum amount of dry air and prevent the generation of white smoke.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

In addition to the above effects, the invention of claim 2 provides
It has the following effects. In the summer, open all the on-off valves, spray hot circulating cooling water sent from the load section to all the gas-liquid contact passages, and make direct contact with the outside air flow,
The circulating cooling water can be cooled by the latent heat effect of vaporization and sent to the load portion for circulation and use. Mid-term (spring, rainy season,
In the fall), of the two gas-liquid contact passages,
The supply of the circulating cooling water to the gas-liquid contact passage of one system is stopped by closing the corresponding on-off valve, and this gas-liquid contact passage is used as the air-only passage, and the high-temperature circulating cooling water flowing through the downflow passage is The outside airflow can be indirectly cooled by the outside airflow flowing through the air passage, and the outside airflow can be made into dry air. Also, the circulating cooling water is supplied to the gas-liquid contact passage of the other system to generate moist air. be able to. The dry air and the humid air can be mixed in a ventilation chamber provided below the exhaust port of the crossflow cooling tower, and can be exhausted to the atmosphere without supersaturated air, that is, without white smoke.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

Next, the invention described in claim 3 is claim 1
In addition to the effects of the invention described in, the following effects are exhibited.
You. In the summer, all the high-temperature circulating cooling water sent from the load section is supplied to the upper water tank, and the circulating cooling water is distributed and supplied to the downflow passage and the gas-liquid contact passage, and in the gas-liquid contact passage. Direct contact between the outside airflow and the circulating cooling water,
The circulating cooling water flowing down the downflow passage is cooled indirectly by the latent heat of vaporization and indirectly cooled with the outside airflow, returned to the load part through the return pipe, and can be circulated for reuse. Can be exhibited 100%. In the interim period, a part of the high-temperature circulating cooling water from the load section is passed through the bypass pipe to reduce the amount of circulating cooling water supplied to the upper water tank compared to the summer period, and the highest distribution pipe goes to one system. Supply to the gas-liquid contact passage of the
Circulating cooling water is supplied to the gas-liquid contact passage of the other system and the downflow passage, and the outside airflow flowing through this air-only passage is made dry air, and flows through the gas-liquid contact passage of the other system to which the circulating cooling water is supplied. The outside airflow can be humid air, and the dry air and the humid air can be mixed in the ventilation chamber to be discharged into the atmosphere without becoming supersaturated air, that is, without white smoke. At this time, the cooling capacity of the cooling tower is 50% to 7% of the cooling capacity in the summer.
It can be about 0%.

[Procedure amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction contents]

The invention according to claim 4 is the invention according to claim 1.
In addition to the effects of, the following effects belong. In the summer, open the flow rate control valve and set the water level in the upper tank to the maximum water level,
All the stepped portions are submerged in water, and water is sprinkled through the flow-down passage and all gas-liquid contact passages through the distribution pipe, so that the cooling capacity of the cooling tower can be fully exhibited. In the intermediate period, the flow control valve is throttled, the water level of the upper water tank is lowered, and circulating cooling water is supplied through a distribution pipe to the gas-liquid contact passage and the downflow passage of the one system, and the other system is supplied. The supply of circulating cooling water to the gas-liquid contact passage is shut off, and as the air-only passage, dry air generated from this air-only passage and wet air generated from one of the gas-liquid contact passages are mixed in the ventilation chamber. It can be exhausted without white smoke without supersaturated air. In the winter, the flow control valve is further throttled, the water level in the upper water tank is set to the lowest level, all the circulating cooling water is supplied only to the downflow passage, and all the gas-liquid contact passages are used as the exclusive air passages, and the dry air The amount of generation can be maximized and the generation of white smoke can be prevented.

[Procedure amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction contents]

The invention according to claim 5 is the invention according to claim 1.
In addition to the effects of, the following effects belong. In the summer, the water level in the upper water tank is set to the maximum water level, and circulating cooling water is supplied to all the gas-liquid contact passages and the downflow passages, whereby the circulating cooling water can be sufficiently cooled. During the interim period, the flow rate of the circulating cooling water to the upper water tank was reduced and
In one of the rooms, an empty room is created in the other gas / liquid contact passage to supply no circulating cooling water, and it is used as a dedicated air passage to generate dry air. The humid air generated from one of the gas-liquid contact passages and the dry air can be mixed in the ventilation chamber and exhausted without white smoke. In the winter, minimize the amount of circulating cooling water flowing into the upper water tank, do not supply circulating cooling water to all gas-liquid contact passages, use only air passages, and supply circulating cooling water only to the downflow passage to dry It can generate the maximum amount of air and prevent the generation of white smoke. The effect of the first embodiment is that the heat exchange partition plate 30 that is a set of two fillers forming the gas-liquid contact passage 20 can be freely assembled and disassembled as a heat exchange unit, so that it can be used depending on the cooling capacity. By increasing or decreasing the number of lever units, the desired cooling capacity and white smoke generation prevention function can be exhibited.

Claims (5)

[Claims] 1. Both side edges are sealed, and a plurality of flat vertical circulating parallel cooling water flow-down passages opened up and down and adjacent to each of the circulating cooling water flow-down passages are formed. At the same time, it has a gas-liquid contact passage in which the circulating cooling water and the air flow come into direct contact with each other and flow in a cross-flow manner, and the circulating cooling water descending passage and the gas-liquid contact passage are partitioned by a heat exchange partition plate. In a cross flow type cooling tower in which a whole rectangular parallelepiped open air type heat exchanger is installed, a flow path for supplying circulating cooling water to the gas-liquid contact passage is divided into at least two systems, and the gas of each system is divided. The cross flow type cooling tower, wherein the liquid contact passage can be switched to a passage exclusively for air as needed. 2. A plurality of distribution pipes are branched from a main pipe for supplying circulating cooling water from a load part to the flow-down passage, and several sprinkler pipes extending from each distribution pipe are air pipes of each system. The cross-flow cooling tower according to claim 1, wherein each sprinkler pipe is provided with an opening / closing valve while being inserted into the liquid contact passage. 3. A bypass pipe for adjusting a flow rate is branched from a main pipe for supplying circulating cooling water from a load section to an upper water tank of the cross flow type cooling tower, and the bypass pipe is a lower portion of the cross flow type cooling tower. The upper water tank is connected to a return pipe for returning the circulating cooling water from the water tank to the load section, and at least two kinds of distribution pipes opened at different heights are installed in the upper water tank. Of the different distribution pipes, the sprinkling pipe extending from one distribution pipe is located in the gas-liquid contact passage of one of the gas-liquid contact passages divided into the two systems, and the sprinkler extending from the other distribution pipe. The cross-flow cooling tower according to claim 1, wherein the water pipe is located in the gas-liquid contact passage of the other system. 4. A flow control valve is provided in a supply pipe for supplying circulating cooling water to an upper water tank of the cross-flow cooling tower, and the bottom of the upper water tank is formed in a stepped shape, and the bottom of the lower water tank is provided at the bottom. The distribution pipe that opens toward the downflow passage is suspended, and the bottom of at least two other steps except the bottom is supplied with circulating cooling water to the gas-liquid contact passage of each system. 2. The cross-flow cooling tower according to claim 1, wherein said distribution pipes communicate with each other. 5. The interior of an upper water tank of a cross-flow cooling tower supplied with circulating cooling water by a supply pipe is partitioned by a weir perpendicular to at least three rooms, and is provided at a bottom of one of the three rooms. A sprinkling pipe that opens toward the downflow passage is suspended, and a distribution pipe that supplies circulating cooling water to the gas-liquid contact passage of each system is suspended at the bottom of the other two chambers. The cross-flow cooling tower according to claim 1, wherein a flow control valve is provided in the cooling tower.