JP3149641B2 - Cold water tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, the demand for cooling water towers for cooling water used in large amounts in various plants, factories, buildings and the like has been increasing.

FIG. 3 shows an example of the cooling water tower. In the case of this cooling water tower, an exhaust port 3 having a blower 2 is provided at an upper portion of a casing 1. The casing 1 is driven by the blower 2. Outside air 6 is taken into the casing 1 from outside air intakes 4 and 5 formed at upper and lower positions on the side, respectively.

A dry heat exchanger 10 is formed in the upper outside air inlet 4 by a number of finned tubes 9 having an upper end connected to the upper header 7 and a lower end connected to the lower header 8 and extending vertically. The cooling water 11 to be cooled is guided to the upper header 7 of the dry heat exchange unit 10 via an introduction line 16.

A sprinkling pipe 12 for sprinkling water to be cooled 11 guided from a lower header 8 of the dry heat exchanging section 10 through a lead-out line 17 is provided on the upper inside of the casing 1.

At the lower position of the sprinkler tube 12, a plurality of long sheets are assembled in a deck shape via a restraining member, or a plurality of sheets having a wave-shaped unevenness are erected. A wet heat exchanging unit 14 is constituted by a filling unit 13 of a wet wall type or the like which is arranged side by side at a required interval in the lateral direction, and a water pipe 12 is provided at the bottom of the casing 1 below the wet heat exchanging unit 14. A cold water tank 15 is provided for collecting the water to be cooled 11 which has been sprinkled and has flowed down the filling unit 13.

[0007] The water to be cooled 1 having a high temperature to be cooled.
1 is led to the upper header 7 of the dry heat exchange section 10 by the introduction line 16 to flow down in the finned tube 9, and the water to be cooled 11 flowing down in the finned tube 9 is discharged from the lower header 8 through the lead-out line 17. The water is then guided to the water pipe 12 and sprinkled above the wet heat exchange section 14, and at the same time, the outside air 6 is sucked from the outside air inlets 4 and 5 by the blower 2 to dry the heat exchange section 1.
0 and the wet heat exchange unit 14
Is cooled by heat exchange with the outside air 6 taken in from the upper outside air inlet 4 in the dry heat exchange section 10, and is further sprayed from the water sprinkling pipe 12 while flowing down through the filling unit 13. It is cooled by heat exchange with the outside air 6 which is taken in from the inlet 5 and rises.

The cooling water 11 cooled by the wet heat exchanging section 14 is effectively cooled by directly exchanging heat with the outside air 6. Although roughly determined by the capacity of the filling unit 13, the outside air 6 that has exchanged heat with the water 11 to be cooled in the wet heat exchange unit 14 is heated and has a humidity of about 100%.
Therefore, if the humid air 6 ′ is discharged from the exhaust port 3 as it is, white smoke is generated when the outside air temperature is low. The generation of such white smoke gives a feeling of disgust to the neighbors as if it is contaminating the outside air, and there is a risk of being mistaken for a fire at night by the action of light. There is an increasing demand for no smoke.

In the illustrated example, a dry heat exchanger 10 is provided to prevent such white smoke, and the outside air 6 flowing along the outer periphery of the finned tube 9 is heated in a dry manner. 6 "dry air with extremely low humidity
The dry air 6 ″ is mixed with the humid air 6 ′ by the blower 2 to reduce the humidity of the air discharged from the exhaust port 3 so as to prevent the generation of white smoke.

[0010]

However, in a cooling water tower used in a geothermal power generation facility, since a deposited substance such as silica is dissolved in the water to be cooled 11 to be cooled by air cooling, a dry heat exchange is performed. During the flow down the inside of the finned tube 9 of the portion 10, the dissolved silica component or the like is precipitated in the water to be cooled 11, and there is a possibility that the scale inside the finned tube 9 adheres and is clogged in a short time. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a cooling water tower capable of satisfactorily removing scale adhesion generated in a dry heat exchange section.

[0012]

According to the present invention, water to be cooled, in which precipitated substances are dissolved, is led to a dry heat exchanger through an introduction line, and then to water spraying means by a lead-out line. In the cold water tower configured to exchange heat with outside air taken in by suction of a blower while cooling the water to be cooled down through the dry heat exchange section and the wet heat exchange section, the cooling water tower, A circulation line having a pump connected to the outlet line and circulating the water to be cooled from the outlet line side to the inlet line side, and a number of sponge balls for removing scale generated in the dry heat exchange unit. And a ball vessel provided in the circulation line so that the sponge balls can be separated and collected from the lead-out line to guide the sponge ball to the circulation line. And a ball separator provided to the connection portion of the ring line, scale in the dry heat exchange section
When removing the coolant, the water to be cooled by driving the pump is
Sponge boat sent out from the ball vessel by circulation
Control line, circulation line, introduction line, dry heat exchange section,
Again via the ball separator via the line sequentially
It is characterized in that it is configured to return to the circulation line .

[0013]

Accordingly, in the present invention, the scale in the dry heat exchange section is used.
When performing the removal, the cooling water is circulated from the outlet line side to the introduction line side by driving the circulation line pump, and the sponge balls are sent out from the ball vessel by the cooling water. The scale introduced into the section flows while removing scale adhered to the inside, reaches the ball separator, is separated and collected from the lead-out line by the ball separator, is guided to the circulation line, and is returned to the ball vessel.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show one embodiment of the present invention, in which the same reference numerals as in FIG. 3 denote the same parts.

In the figure, reference numeral 18 denotes a cooling water tower constructed substantially in the same manner as the above-described cooling water tower of FIG. 3, in which a circulation line 19 is provided between the introduction line 16 and the extraction line 17.
The cooling water 11 is circulated from the outlet line 17 side to the introduction line 16 side by the pump 20 provided in the circulation line 19.

Here, the circulation line 19 is branched and connected to each of the introduction line 16 and the lead-out line 17 of the dry heat exchanger 10 for each of the divided blocks via three-way valves 21 and 22. By remotely operating the three-way valves 21 and 22 in the central control room 23, the cooling water 11 can be circulated for each block in the dry heat exchange unit 10 of each system-divided block.

Further, at a required position of the circulation line 19, a ball vessel capable of collecting and feeding a large number of sponge balls 24 for removing scale generated in the finned tube 9 of the dry heat exchange section 10. 25 are provided.

That is, the inside of the ball vessel 25 is
The ball 35 is divided into a ball collection chamber 25a and a water passage chamber 25b by the screen 35.
A circulation line 19 branched and connected to each of 5a and 25b
The plurality of sponge balls 24 are transferred to the ball collection chamber 25 by switching the flow paths by the respective on-off valves 26 and 27.
a to be cooled 11
Only, or the sponge balls 24 can be sent out from the ball collection chamber 25a by the water 11 to be cooled.

The sponge balls 24 are separated and recovered from the lead-out lines 17 at the respective connecting portions of the circulation lines 19 to the respective lead-out lines 17 so as to be connected to the circulation lines 19.
Is provided.

That is, the inside of the ball separator 28 is also divided into a ball collection chamber 28a and a water passage chamber 28b by a screen 29 similarly to the ball vessel 25.
The ball collection chamber 28 a, which is on the upstream side in the flow direction of the cooling water 11 toward (water spraying means), is connected to the circulation line 19.

Further, the ball separator 28 is provided with a differential pressure transmitter 31 for detecting a differential pressure between the ball collection chamber 28a and the water passage chamber 28b and generating a differential pressure signal 30. The screen 29 is the electric motor 3
2, the rotation can be reversed around the rotation shaft 33 as shown in FIG. 2, and the differential pressure signal 30 from the differential pressure transmitter 31 is monitored in the central control room 23 to increase the differential pressure value. At this time, it is determined that the screen 29 is clogged, and the motor 29 is remotely operated from the central control room 23 to invert the screen 29, and the clogging of the screen 29 can be removed by the flow of the cooling water 11. It is like that.

That is, in the case of the ball vessel 25 described above, it is possible to place the ball vessel 25 in a place where maintenance and inspection by an operator is easy, but in the case of the ball separator 28, the dry heat exchange unit 10 Since it must be arranged in the lead-out line 17 connecting to the water sprinkling pipe 12, it is difficult to perform maintenance and inspection by an operator. Therefore, the clogging of the screen 29 as described above can be removed by remote control. It is preferable to take measures.

In the drawing, reference numeral 34 denotes an opening / closing valve for cutting off the flow of the cooling water 11 in the circulation line 19 during the normal operation of the cooling water tower 18.

Thus , the scale removal in the dry heat exchange section 10 is performed.
When removing , the three-way valves 21 and 22 are remotely operated in the central control room 23 to connect the circulation line 19 to the dry heat exchange unit 10 of the predetermined block, and the pump 20 drives the cooling water 11 to drive the cooling water 11. When the sponge balls 24 are circulated and the sponge balls 24 are sent out from the ball collecting chamber 25a of the ball vessel 25 by the water 11 to be cooled, the sponge balls 24 are closed and the open / close valve 26 is opened. When passing through the finned tube 9, it flows while removing scale attached to the tube 9, reaches the ball separator 28, and is separated from the water 11 to be cooled by the screen 29 in the ball separator 28. Collected ball collection chamber 2
8a, and is returned to the ball vessel 25 from the ball collection chamber 28a.

The circulation of the sponge balls 24 is repeated for a required time, and when the descaling of the dry heat exchanger 10 of a predetermined block is completed, each of the three-way valves 21 and 22 is switched to sequentially switch the dry heat exchanger 10 of another block. Perform scale removal.

When the descaling of the dry heat exchangers 10 of all the blocks is completed as described above, the on-off valve 27 is opened and the on-off valve 26 is closed to allow all the water 11 to be cooled introduced into the ball vessel 25 to flow. When the flow path is switched so as to be sent out from the water chamber 25b, each sponge ball 24
Are the ball collection chambers 25 in the ball vessel 25 sequentially.
a.

Therefore, according to the above-described embodiment, it is possible to satisfactorily remove the adhesion of the scale generated in the dry heat exchanging section 10 and to provide the finned tube 9 of the dry heat exchanging section 10.
It is possible to reliably prevent the inside from being closed in a short time.

The cooling water tower of the present invention is not limited to the above-described embodiment. In the illustrated example, the heat exchange between the outside air and the water to be cooled in the wet heat exchange section is performed by the counter flow method. As shown in the above, a cross-flow method that guides the outside air from the lateral direction of the wet heat exchange unit may be adopted, the water sprinkling means may be a water tank with a water sprinkling hole opened at the bottom other than the water sprinkling pipe, dry heat exchange It is needless to say that the structure of the part is not limited to the illustrated example, and that various changes can be made without departing from the scope of the present invention.

[0030]

According to the above-described cooling water tower of the present invention, it is possible to satisfactorily remove the scale adherence generated in the dry heat exchange section, and to reliably prevent the dry heat exchange section from being blocked in a short time. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention.

FIG. 2 is a schematic view showing a state where the screen of the ball separator of FIG. 1 is inverted.

FIG. 3 is a schematic view showing a conventional example.

[Explanation of symbols]

 2 Blower 6 Outside air 10 Dry heat exchanger 11 Water to be cooled 12 Sprinkler tube (sprinkler means) 14 Wet heat exchanger 16 Inlet line 17 Outgoing line 18 Cold water tower 19 Circulation line 20 Pump 24 Sponge ball 25 Ball vessel 28 Ball separator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28F 19/00 F28C 1/14 F28G 1/12

Claims (1)

(57) [Claims] 1. The cooling water in which the precipitated substance is dissolved is led to a dry heat exchange unit via an introduction line, and then guided to a water spraying unit by an outlet line to spray water over the wet heat exchange unit. In a cooling water tower configured to exchange heat with outside air taken in by suction of a blower while flowing down the dry heat exchange section and the wet heat exchange section, and to cool, the connection between the introduction line and the outlet line is established. And a circulation line having a pump for circulating water to be cooled from the outlet line to the introduction line, and a large number of sponge balls for removing scale generated in the dry heat exchange section. A ball vessel provided in the circulation line,
A ball separator provided at a connection portion of the circulation line to the derivation line so that the sponge ball can be separated and recovered from the derivation line and guided to the circulation line ,
When removing scale from the dry heat exchange section,
The ball vessel is circulated by circulating the cooling water by driving the pump.
Sponge balls sent out from the circulation line, introduction
Line, dry heat exchange section, lead-out line
I will return to the circulation line again via the ball separator
A cooling water tower characterized in that it is configured as follows.