JP2903067B2 - Large cross-flow cooling tower with white smoke generation prevention function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross-flow cooling tower having a function to prevent white smoke.

(Prior Art) This type of cooling tower is disclosed in JP-A-57-92688 and JP-A-61-175.
No. 480, and described in JP-A-55-131685,
It has the expected white smoke prevention effect.

(Problems to be solved by the invention) Among such prior arts, in a cooling tower described in Japanese Patent Application Laid-Open No. 57-92688, a horizontal damper and a vertical damper are surrounded by a dry heat exchanger so as to surround a mixing chamber. And a wet heat exchanger, where the humid air that has passed through the horizontal damper and the dry air that has passed through the vertical damper are alternately three-dimensionally crossed in this mixing chamber and mixed. By operating the blower provided at the exhaust port, the dry heat exchanger arranged near the blower and the dry air flowing into the mixing chamber through the vertical damper are drawn upward toward the exhaust port immediately after exiting this vertical damper. As a result, the amount of crossing of the humid air passing through the horizontal damper is very small, and the exhaust air is exhausted from the exhaust port before the dry air and the humid air are mixed sufficiently in this mixing chamber. Not been able to demonstrate the effect is real.

Similarly, the cooling tower described in JP-A-61-175480 also has the same drawbacks as those described in the above-mentioned publication, and its effect of preventing white smoke has a sense of one step.

Next, unlike the above two prior arts, the mixing apparatus for a cooling tower described in Japanese Patent Application Laid-Open No. 55-131685 is different from the two prior arts in that a cross section V for guiding dry air blown out from a dry heat exchanger into a mixing chamber. A U-shaped or U-shaped channel is inclined from the lower end of the dry heat exchanger toward the center of the exhaust port,
This channel acts as a baffle against the rising movement of the humid air, while diffusing the dry air toward the exhaust port, and mixing the humid air and the dry air under the exhaust port by the action of this channel. Therefore, the power of the blower becomes large, and since this channel has a V-shaped or U-shaped cross section as described above, most of the dry air blown out from the dry heat exchanger is blown out by the blower immediately after the blow-out. And the exhaust air is exhausted from the exhaust port before the sufficiently dry air and the humid air are mixed in the mixing chamber as in the two prior art cooling towers, and a complete white smoke prevention effect is obtained. There is anxiety that cannot be exerted. Furthermore, since there is not enough space between the lower side of the blower and the upper end of the air outlet of the dry heat exchanger, the dry air that has flowed out from the upper end of the air outlet cannot be sufficiently sucked into the outlet, and the exhaust It has the disadvantage that it is exhausted at the periphery of the mouth without being sufficiently mixed with moist air.In particular, when the dry heat exchanger is made of synthetic resin, the heat exchange rate is slightly lower than that of metal fins. Due to the inferiority, the temperature of the dry air does not become so high, and it is desired that the mixing degree be uniform. However, the conventional technique having the above-mentioned drawbacks cannot sufficiently satisfy such a demand.

The moist air and dry air as described above do not mix well,
The phenomenon that white smoke is generated from the exhaust port is remarkable in a large cross-flow type cooling tower having a function of preventing white smoke generation, which is recently used for district cooling and heating.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a large cross-flow cooling tower capable of achieving a sufficient effect of preventing the generation of white smoke without using the above-mentioned mixing duct.

B. Configuration of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a cooling tower body in which filler units are arranged in multiple stages up and down over the height direction of an outside air intake of the cooling tower body. In the cross-flow type large cooling tower, the packing unit at each stage comprises a wet heat exchanger and a dry heat exchanger disposed above the wet heat exchanger, and passes through the wet heat exchanger. An exhaust port is provided to exhaust the mixed air of the humid air and the dry air that has passed through the dry heat exchanger to the atmosphere. A cooling water distribution device for supplying the cooling water to the dry heat exchanger is provided, and a water collecting device for individually guiding and collecting the cooling water cooled while flowing the filler unit of each stage to the lower water tank is provided. The cooling water distribution device , Launched in the cooling tower in the main body 1
A riser pipe, and a distribution pipe which protrudes horizontally from the peripheral surface of the riser pipe and whose leading end discharge port is located on the side of the cooling water supply unit of the dry heat exchanger in the filler unit in each stage, The water device has a gutter that is provided almost horizontally on the cooling water discharge part side of the wet heat exchanger in each of the filler units and also serves as a filler unit supporting frame, and flows down into the gutter from the cooling water discharge part side. A large cross-flow type cooling tower with a function to prevent white smoke emission, comprising a vertical pipe that is flat in the direction of flow of the external air flow and also serves as a cooling tower frame that collects cooling water once guided to a lower water tank.

The multi-stage filling unit is divided into several blocks by a flat downspout doubling as the cooling tower frame arranged at intervals in the width direction of the outside air intake, and cooling the wet heat exchanger for each block. It is preferable that the cooling water drainage port of the gutter arranged on the water discharge part side is opened in the adjacent vertical gutter in view of the piping of the cooling tower and its strength.

In order to solve the above problem, a related invention relates to a large cross-flow type cooling tower in which filler units are arranged in a cooling tower body in multiple stages up and down over the height direction of an outside air intake of the cooling tower body, The material unit is composed of a wet heat exchanger and a dry heat exchanger disposed above the wet heat exchanger, and is used for removing the wet air passing through the wet heat exchanger and the dry air passing through the dry heat exchanger. An exhaust port for exhausting the mixed air to the atmosphere is provided.Each filler unit has a cooling water distribution device that supplies cooling water heated from a load unit onto the dry heat exchanger of the filler unit. In addition to the above, a water collecting device is provided for individually guiding and collecting the cooling water cooled while flowing the filler unit of each stage to the lower water tank, and the cooling water distribution device is provided inside the cooling tower main body. Launched in 1
A riser pipe, and a distribution pipe which protrudes horizontally from the peripheral surface of the riser pipe and whose leading end discharge port is located on the side of the cooling water supply unit of the dry heat exchanger in the filler unit in each stage, The water device has a gutter that is provided almost horizontally on the side of the cooling water discharge part of the wet heat exchanger in the packing unit of each stage and also serves as a packing unit support frame and independently communicates each gutter with the lower water tank. A connecting pipe, wherein the water collecting device includes a gutter that is provided almost horizontally on the side of the cooling water discharge part of the wet heat exchanger in the packing unit of each stage and also serves as a packing unit support frame, and each gutter and lower part. It is characterized in that it comprises a connecting pipe for communicating the water tanks independently.

(Operation of the Invention) The operation of the specific invention configured as described above will be described below.

The still warm cooling water sent from a load unit such as a refrigerator is distributed and supplied to the upper heat exchanger in each stage of the packing unit through each distribution pipe while ascending in the riser of the distributor. Spraying from the upper part of the synthetic resin dry heat exchanger in the filler unit of each stage, the outside air taken into the air passage of the dry heat exchanger from the outside and the cooling water indirectly flows during the flow. After heat exchange and cooling of the cooling water, the cooling water is sprayed onto the wet heat exchangers which are arranged hierarchically below the dry heat exchanger, and the outside air and the cooling water are flowing down on the surface of the wet heat exchanger. And the cooling water is cooled to a predetermined temperature by a latent heat effect.

In this way, the cooling water individually cooled in each of the filler units at each stage is once guided to the lower water tank by the water collecting device, collected, returned to the load portion, circulated and heated again, and then the dry process is performed. Redistributed and supplied to the heat exchanger by the distributor.

The humid air whose absolute humidity has increased due to heat exchange in the lower part of the wet heat exchanger in the filler unit of each stage passes through the wet heat exchanger by the suction action of the blower provided at the exhaust port and rises toward the exhaust port. I will do it.

Also, dry air whose absolute humidity does not change due to heat exchange in the upper dry heat exchanger in the filler unit of each stage is also subjected to the suction action of the blower, from the air outlet of the air passage of the dry heat exchanger. The blowout rises toward the exhaust port.

In this way, the dry air and the humid air that are blown out from the filling unit of each stage in the upper and lower layers do not become turbulent, but are diffused and mixed with each other in a mutually parallel laminar flow state, and are suctioned upward toward the exhaust port. Then, the flow of dry and humid air, which are finely distributed at the exhaust port by the rotating blades of the low-power blower, are further mixed and stirred by the rotating blades of the low-power blower, and the air flows from the exhaust port to the atmosphere without becoming supersaturated air. Exhausted.
In other words, the gas is exhausted outside the cooling tower without generating white smoke.

The cooling water distribution device is set up in the cooling tower main body.
Since this riser pipe is composed of a riser pipe and a distribution pipe which protrudes horizontally from the peripheral surface of the riser pipe and whose leading end discharge port is located on the side of the cooling water supply section of the dry heat exchanger in the filler unit at each stage, the load is increased. The still warm cooling water sent from the section is distributed and supplied to the upper dry heat exchanger in the packing unit of each stage through the distribution pipe while rising in the riser pipe in the cooling tower main body. And intermittently contact the outside air, and the outside air is heated to dry air at a desired temperature.

The water collecting device has a filler unit supporting frame and a gutter provided almost horizontally on the cooling water discharge part side of the wet heat exchanger in the filler unit of each stage, and from the cooling water discharge part side to the inside of the gutter. Since the cooling water that has flowed down is once formed of a flat vertical gutter also serving as a lower water tank cooling tower frame, the cooling water cooled to a predetermined temperature flows down and stays in the gutter, and then from this gutter to the lower water tank through the vertical gutter. After being guided and collected, it is returned to the load section.

3. The cooling tower according to claim 2, wherein the cooling water distributed and supplied to each block is cooled in a dry-type or wet-type heat exchanger, and then collected in each gutter, and then from the drainage port to an adjacent vertical gutter. And flows down the downspouts and is collected by falling toward the lower water tank.

In other words, the cooling water that has been cooled flows into the downspouts adjacent to the blocks adjacent to the left and right independently for each of the filler units in each stage, and is collected in the lower water tank.

At this time, when each downspout is formed of a material having good thermal conductivity, the cooling water falling down the downspout is indirectly cooled with the outside air flow.

In order to promote this cooling, a fin-shaped thing is added to the side surface of the downspout.

In the cooling tower according to the third aspect, the operation different from that of the cooling tower according to the first aspect is as follows. That is, the cooling water cooled by the filler units in each stage is collected in the gutter and then individually dropped and collected in the lower water tank through a connection pipe connected from each gutter.

(Example) A typical example of the invention described in claims 1 and 2 will be described below.

In FIG. 1, A is a large cross-flow type cooling tower, in which a plurality of packing units B are arranged in upper and lower stages over the height direction of the outside air intake 13 in the cooling tower body.

The filler unit B includes a wet heat exchanger 10 and a synthetic resin dry heat exchanger disposed above the wet heat exchanger 10.
A fan 13 is provided at an exhaust port 12 for exhausting a mixed air of humid air passing through the wet heat exchanger 10 and dry air passing through the dry heat exchanger 11 to the atmosphere. It is. The dry heat exchanger 11 may be made of a metal plate or a heat coil.

The multi-stage filler unit B is provided with a cooling water distribution device D that supplies the cooling water heated from the load section G onto the dry heat exchanger 11 of the filler unit B. A water collecting device E for guiding and collecting the cooling water cooled down while the unit B flows down into the lower water tank F is provided for each packing material unit B in each stage, and the cooling water distribution device D includes a cooling tower main body. One riser pipe 20 which rises inside, and projects horizontally from the peripheral surface of the riser pipe 20, and its leading end discharge port 21 has a
And a distribution pipe 22 located on the side of the cooling water supply section of the dry heat exchanger 11 in FIG.

The water collecting device E comprises a tray-shaped trough 30 which is provided almost horizontally on the cooling water discharge part side of the wet heat exchanger 11 in the filler unit B of each stage and also serves as a filler unit support frame, and The cooling water flowing down into the gutter 30 is once guided to the lower water tank F and collected by a vertical gutter 31 which is flat in the flow direction of the external air flow also serving as a cooling tower frame.

Each of the downspouts 31 is made of a high-strength material (for example, iron and steel), and a number of various uneven patterns such as fins are arranged on the side surface of the downspout 31 as necessary (not shown).

In some cases, the downspout 31 is formed into a box shape by combining two synthetic resin channel members (see FIG. 5). In this case, the downspout 31 is lightweight,
The side wall may have an uneven shape, and the downspout 31 may have a shape capable of obtaining the heat exchange effect of the cooling water.

Further, the multi-stage filler unit B is provided with the outside air intake port.
13 is divided into several blocks B ′ by the flat downspout 31 serving also as the cooling tower frame arranged at intervals in the width direction of the cooling tower frame, and the wet heat exchanger 11 is provided for each of the upper and lower blocks B ′.
Cooling water discharge port of the gutter 30 disposed on the side of the cooling water discharge section
30a is opened in the downspout 31 (see FIGS. 3 and 4).

The cooling water drainage port 30a of the illustrated gutter 30 is formed by cutting off a half of the downstream side of one side of the gutter 30 parallel to the flow of the outside air flow. , A cutout in the corresponding side wall of the adjacent downspout 31
31d (see FIGS. 2 and 4).

When the width of the gutter 30 is wide, the cooling water drainage ports 30a are provided on both side walls of the gutter 30 (see the imaginary line in FIG. 5), and the cooling water drainage ports 30a are provided in the vertical gutters 31 located on both sides. And insert
Drain the cooling water quickly.

Further, a ridge for cooling water drainage is formed on the bottom surface of the gutter 30 as necessary (not shown).

Further, the depth dimension of the flat downspout 31 is formed to be the same as the depth dimension of the pan-shaped trough 30 of each stage.

An upper water tank 14 is provided above the dry heat exchanger 11 in the packing unit B of each stage.
The outlet port 21 of the distribution pipe 22 is inserted therein (second
See figure).

The outside air intake 13 of the dry heat exchanger 10 in each of the filler units B is provided with a damper 15 whose opening degree can be changed.

This damper 15 is a white smoke detector installed at the exhaust port 12.
It is an electric damper whose opening and closing degree is adjusted according to the 16 detection signals.

Instead of using the upper water tank 14 of the above embodiment, one spray nozzle group of the distribution pipe 20 directly connected to the load section is inserted into the cooling water supply section of the dry heat exchanger 11. Further, as the water collecting device E, a gutter 30 for supporting the filler unit, which is disposed for each of the filler units B at each stage, is independently connected to the lower water tank F via a connecting pipe for collecting water. (Corresponding to a typical embodiment of the invention described in claim 3).

The operation of the embodiment is the same as the operation of the invention described in the corresponding claims, and the description thereof will be omitted to avoid duplication.

(C) Effects of the invention First, in the invention described in each claim, by configuring the filler unit of each stage as described above, dry air and humid air are layered for each of the filler units of each stage and below the exhaust port. And the air can be sucked toward the exhaust port in this state.

That is, the dry air in the filler unit of each stage is discharged in a laminar flow state at a desired flow rate from the dry heat exchanger toward the exhaust port, and the wet air exiting from the lower wet heat exchanger also rises. Is sucked toward the exhaust port as a laminar flow distributed in a mutually distributed state along the flow. In this way, the flow of the dry air and the humid air discharged from the filler units of all the stages is hardly agitated below the exhaust port,
The dry air and the humid air flow in a rectified state while diffusing with each other.After that, the dry air and the humid air are stirred by the blower provided in the exhaust port, so that the dry air and the humid air can be sufficiently mixed without increasing the power of the blower. The desired white smoke prevention effect can be exhibited without using any mixing duct, the power consumption of the large cooling tower as a whole can be reduced, and the overall height of the large cooling tower can be reduced.

Next, since the distribution device for supplying and distributing the heated cooling water from the load portion to the dry heat exchanger in each stage of the packing unit is provided, dry air is efficiently generated from each stage of the packing unit in winter. It is possible to enhance the effect of preventing generation of white smoke.

In addition, the cooling water cooled by the filling unit of each stage is
Since the water collecting device that guides and collects the water in the lower water tank without passing through the lower filler unit is provided, the cooling water can be sufficiently cooled in the filler unit in each stage, and a predetermined amount of dry air is discharged. Obtainable.

Furthermore, while cooling in the riser of the distribution device in the main body of the large cooling tower, warm cooling water from the load section can be distributed and supplied to the dry heat exchanger in the packing unit of each stage through each distribution pipe while being raised. The space of the tower body can be used effectively,
The occupied space can be reduced by eliminating the piping outside the large cooling tower.

In particular, in the case of the cooling tower of the first aspect, after cooling water cooled to a predetermined temperature flows down and stays in the gutter, the cooling water is once guided to the lower water tank through the downspout and returned to the load section. And this gutter can be used as a support member for each filler unit, and the downspout forms part of the cooling tower frame,
The piping and structure of the large cooling tower can be simplified in cooperation with the gutter, and the assembly strength can be increased. .

In particular, in the cooling tower according to claim 2, the cooling water distributed and supplied to each block is sequentially cooled in a dry-type and wet-type heat exchanger, and then collected in each gutter, and then discharged from the drainage port. The water flows into adjacent downspouts, flows down these downspouts, and can be dropped and collected toward the lower water tank.

As a result, the gutter and the downspout can easily form a lattice-like support frame of the filler unit for each block, and the cooling can be performed more quickly through the gutter and downspout set for each block. Water can be collected in the lower aquarium.

In particular, in the cooling tower according to claim 3, after the cooling water cooled by the filler unit of each stage is collected in the gutter, the cooling water can be individually dropped and collected from each gutter to the lower water tank through a connection pipe, The structure of the collection device can be simplified.

(Effects Specific to the Embodiment) This embodiment has the effects of the respective inventions, and also has the effects unique to the embodiment relating to the dry heat exchanger 11 as follows.

That is, the cooling water drainage port 30a of the gutter 30 of this embodiment is formed by cutting off the downstream half of one side of the gutter 30 parallel to the flow of the outside air flow, and the cooling water drainage port 30a is formed. Since one side is inserted into the insertion opening 31d formed by cutting out a corresponding side wall of the adjacent vertical gutter 31, the vertical gutter 31 adjacent to the gutter 30 is inserted.
Can be easily performed only by the insertion operation, and the bonding structure can be simplified.

When the cooling water drainage ports 30a are provided on both side walls of the gutter 30, even if the width dimension (dimension along the outside air inlet 13) of each block B 'of the filler unit B is large, The cooled cooling water that has flowed down falls smoothly into the lower water tank F through the downspouts 31 on the left and right sides, and can be quickly collected.
In addition, the number of blocks B 'can be reduced,
Can be loaded into the cooling tower body in a short time.

If a ridge for cooling water drainage is formed on the bottom surface of the gutter 30 and extends almost parallel to the outside air flow direction, without stagnation,
The cooling water can be guided to the downspout 31 and flow down.

In the case where a large number of various fin-like irregular patterns such as fins are arranged on the side surface of each downspout 31, the cooling water flowing down the downspout 31 is more efficiently indirectly connected to the outside air inlet 13 by the outside air flow near the outside air intake 13. It can be cooled down, falls into the lower water tank F, and can be collected quickly.

When the downspout 31 is formed into a box shape by combining two synthetic resin channel members with each other,
31 can be made lighter, the weight of the entire large cooling tower can be made lighter,
Its transportation and assembly can be facilitated.

[Brief description of the drawings]

FIG. 1 relates to the present invention, FIG. 1 is a schematic view of a large cooling tower of the first embodiment, FIG.
FIG. 4 is a longitudinal sectional view of a main part in FIG. 2, FIG. 4 is an exploded perspective view showing a joining relationship between the gutter and the down gutter of FIG. 2, and FIG. 5 is a cross sectional view showing an example of the structure of the down gutter. It is. Main symbols in the figure: A: large cooling tower, B: filler unit, D: cooling water distribution device, E: water collecting device.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-56-105297 (JP, A) JP-A-61-175480 (JP, A) JP-A-52-120435 (JP, A) JP-A 57-105 16783 (JP, A) Japanese Utility Model Showa 60-176363 (JP, U) Japanese Utility Model Showa 58-10593 (JP, U) Japanese Utility Model Showa 39-33527 (JP, Y1) (58) Fields investigated (Int. ⁶ , DB name) F28C 1/00-1/16 F28F 25/00-25/12 F28D 5/00-5/02

Claims (3)

(57) [Claims] 1. A large cross-flow type cooling tower in which packing units are arranged in the cooling tower main body in multiple stages up and down over the height direction of the outside air inlet of the cooling tower main body, wherein the packing unit is a wet heat exchanger. And a dry heat exchanger disposed above the wet heat exchanger, and exhausts a mixture of moist air passing through the wet heat exchanger and dry air passing through the dry heat exchanger to the atmosphere. An exhaust port is provided, and the filler unit at each stage is provided with a cooling water distribution device that supplies heated cooling water from the load unit onto the dry heat exchanger of the filler unit. There is provided a water collecting device for individually guiding and collecting the cooling water cooled while flowing down the packing unit of the stage to the lower water tank, wherein the cooling water distribution device is one of the cooling water main bodies that is set up in the cooling tower body. Riser and water from the surrounding surface of the riser Overhang to,
The discharge port at the leading end comprises a distribution pipe located on the side of the cooling water supply unit of the dry heat exchanger in each of the packing units, and the water collecting device cools the wet heat exchanger in each of the packing units. A tray-shaped gutter that is provided almost horizontally on the water discharge part side and also serves as a support frame for the filler unit, and also serves as a cooling tower frame that once guides and collects cooling water that has flowed into the gutter from the cooling water discharge part side to the lower water tank A large cross-flow type cooling tower with a function to prevent white smoke generation, characterized by a vertical downspout in the flow direction of the outside air flow. 2. The multi-stage filling unit is divided into several blocks by a flat downspout which is also used as the cooling tower frame and is arranged at intervals in the width direction of the outside air intake, and the wet type is provided for each block. 2. The white smoke generation according to claim 1, wherein a cooling water discharge port of the gutter arranged on a cooling water discharge portion side of the heat exchanger is opened in the adjacent vertical gutter. Large cross-flow cooling tower with prevention function. 3. A large cross-flow type cooling tower in which packing units are arranged in the cooling tower body in multiple stages up and down over the height direction of the outside air inlet of the cooling tower body, wherein the packing unit is wet heat exchange. And a dry heat exchanger disposed above the wet heat exchanger, and exhausts a mixture of moist air passing through the wet heat exchanger and dry air passing through the dry heat exchanger to the atmosphere. An exhaust port is provided, and the filler unit at each stage is provided with a cooling water distribution device that supplies heated cooling water from the load unit onto the dry heat exchanger of the filler unit. There is provided a water collecting device for individually guiding and collecting the cooling water cooled while flowing down the packing unit of the stage to the lower water tank, wherein the cooling water distribution device is one of the cooling water main bodies that is set up in the cooling tower body. Riser and water from the surrounding surface of the riser Overhang to,
The discharge port at the leading end comprises a distribution pipe located on the side of the cooling water supply unit of the dry heat exchanger in each of the packing units, and the water collecting device cools the wet heat exchanger in each of the packing units. A white smoke generation prevention function characterized by comprising a gutter that is provided almost horizontally on the water discharge part side and also serves as a support frame for the filler unit, and a connecting pipe that communicates each gutter and the lower water tank independently. Large cross-flow cooling tower.