JP2002206874A - Cooling tower having freeze-proofing function method of operating the same, and louver therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the frost between louver boards by heating an outside air intake thereby melting the icicles frozen between louver boards easily in a short time and enabling them to be removed easily from the louver boards on one hand, and by reforming the defects of a conventional art and taxing ingenuity in the intake of outside air. SOLUTION: A sealed cooling tower A takes outside air into the main body 16 of a cooling tower through the space between the adjacent louvers, and cools circulating cooling water flowing within the above sealed heat-exchanging coil 13 fitted with fins indirectly by the contact of an outside air current into the sealed heat-exchanging coil 13 fitted with fins of a kind of a heat exchanger. A heating element is provided at the outside of this louver board 11. This heating element is a sheet-type heater (for example, a carbon film), and it is of such structure that it heats the outside air current flowing between louver boards as capable of heating in the freezably cold atmosphere in winter season.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling tower operating method, a cooling tower having an antifreezing function, and a louver for the cooling tower.

[0002]

2. Description of the Related Art Conventionally, when the outside temperature of a cooling tower is below freezing during a winter operation of a cooling tower, an ice column is formed between a plurality of adjacent louver plates forming an outside air intake in the cooling tower, and the amount of outside air taken in The cooling capacity of the cooling tower tends to decrease, and in the worst case, the outside air intake is completely blocked by icicles, the intake of outside air becomes impossible, the cooling tower is immediately stopped, and At present, icicles attached between the louver plates and between the heat exchangers are removed.

[0003]

It is not easy to remove the icicles manually as described above. In winter when the outside air temperature is low, the working environment is poor and the icicles cannot be quickly removed. In addition, there is a possibility that the louver or the heat exchanger may be damaged by the work for removing the ice pillar. An object of the present invention is to improve the drawbacks of the conventional technology and to devise the intake of the outside air to easily and quickly dissolve the icicles frozen between the louver plates, and to remove the icicles from the louver plates. An operation method of a cooling tower which can be easily removed, a cooling tower having an antifreezing function, and a louver for the cooling tower are provided on the market. Another object of the present invention is to improve the drawbacks of the conventional technique and to devise the intake of outside air, thereby preventing ice formation between the louver plates and constantly exchanging a desired amount of air. It is an object of the present invention to provide a cooling tower operating method capable of flowing between the vessels, a cooling tower having an antifreezing function, and a louver for the cooling tower on the market.

[0004]

In order to solve the above problems, a specific invention is to rotate a blower provided at an exhaust port to draw an outside air flow into a cooling tower body from between louver plates forming an outside air intake. A method of operating a cooling tower for cooling circulating water or spray water sprayed on a heat exchanger by indirect or direct contact with an external air flow and exhausting the air whose temperature has been raised from the exhaust port; Heat the plate,
There is provided a method for operating a cooling tower, which comprises heating an external airflow flowing between louver plates.

[0005] In order to solve the above-mentioned problem, the method of operating the cooling tower is characterized in that the louver plate is heated from its outer surface by a sheet heater. In order to solve the above-mentioned problem, the method of operating the cooling tower is characterized in that the louver plate is heated from the inside by a heater embedded therein.

In order to solve the above-mentioned problem, the method of operating the cooling tower is characterized in that the louver plate is heated with hot water.

[0007] In order to solve the above problems, a related invention includes:
In a cooling tower in which a louver plate forming an outside air intake is arranged in a cooling tower body, a heating element is provided on an outer surface or inside of the louver plate.

In order to solve the above-mentioned problem, the heating element in the cooling tower is capable of generating heat at a time when ice formation can occur in winter, and heats an external airflow flowing between the louver plates.

In order to solve the above problem, the heating element in the cooling tower is characterized in that the heating element is a heater embedded in the louver plate.

In order to solve the above-mentioned problem, the heating element in the cooling tower is a sheet heater, which is provided on the entire outer surface of the louver plate or on the inner edge thereof.

In order to solve the above-mentioned problems, a hot water passage is formed inside the louver plate in the cooling tower.

[0012] In order to solve the above problems, a related invention includes:
A louver for a cooling tower, comprising a louver plate in the cooling tower according to claim 5, 6, 7, or 8.

In order to solve the above-mentioned problem, the louver plates of this louver are of a horizontal type or a vertical type and are arranged at intervals.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 This embodiment is a typical embodiment of the invention described in claims 5, 6, and 8, and is a representative embodiment of the invention described in claims 10 and 11. Also described. 1 and 4, A
Is a closed type cooling tower, and the outside air intake 10 of the cooling tower A is composed of a plurality of horizontal louver plates 11 arranged at an interval above and below. The cooling tower A takes in outside air into the cooling tower main body 12 through the space between the adjacent louver plates 11 and indirectly contacts with the fin-closed heat exchange coil 13 which is a kind of heat exchanger and the outside air flow. It is for cooling the circulating cooling water flowing in the finned closed heat exchange coil 13. A heating element 14 is provided on the outer surface of the louver plate 11. The heating element 14 is a sheet-like heater (for example, a carbon film) 15 and is capable of generating heat at a time when icing can occur in winter.
It has a structure for heating the outside airflow flowing between the two. The sheet-like heater 15 is provided on the outer surface 18 of the louver plate 11.
It is laid at intervals according to. However, the present invention is not limited to this, and the sheet-like heater 15 may be
May be continuously attached to the outer surface 18 or the entire front and back surfaces. It is preferable that the sheet-shaped heater 15 is a waterproof type and is capable of adjusting a set temperature.

The operation of the first embodiment will be described as a typical embodiment of the method of the present invention. In a season other than the winter season, the switch of the sheet heater 15 does not generate heat in an off state, and operates similarly to a known cooling tower. That is, the blower 20 provided at the exhaust port 19 is rotated, and the outside air flows through the louver plate 11 forming the outside air intake port.
The heat exchange body 21 which flows into the cooling tower body 16 from between the pipes and is provided with the finned closed heat exchange coils 13 in multiple stages.
The circulating water or spray water sprayed thereon is cooled by indirect or direct contact with the outside air flow, and the air whose temperature has been raised is exhausted from the exhaust port 19. In winter, the power of the sheet heater 15 is turned on by a thermometer or a manual input, the louver plate 11 is heated by the sheet heater 15, the louver is heated, and ice formation at the louver plate 11 is prevented. . At this time, the surface temperature of the louver plate 11 was set to 4
It is preferable that the temperature be within the range of degrees C to 10 degrees C.

Embodiment 2 A configuration different from that of Embodiment 1 is that the cooling tower A1 is an open type cooling tower of a gas-liquid direct contact type, and this cooling tower A1 takes in outside air by passing between adjacent louver plates 11. This is for cooling spray water flowing on the surface of the filling plate 12A by direct contact between the filling plate 12A, which is an open type heat exchanger, which is a kind of heat exchanger, and the outside air flow. In addition, the same reference numerals as those of the first embodiment have the same configuration and perform the same operation (see FIG. 2).

Embodiment 3 This embodiment is a typical embodiment of the invention described in claim 9 and will be described together with the typical embodiment of the invention described in claims 10 and 11. A different configuration from the first embodiment is that a hot water passage 22 is formed inside the louver plate 11 (see FIG. 3). In addition, the same reference numerals as those in the first embodiment have the same configuration and the same functions. The specific operation in this embodiment is a typical embodiment of the invention described in claim 4. That is, in winter, the louver plate 11
As in the first embodiment, hot water flows through the hot water passage 22 to heat the outside air flowing between the louver plates 11 to prevent icing at the louver plate 11 portion. It is desirable to use a part of the spray water or circulating water as the warm water. It should be noted that the use of steam instead of the hot water is also included in the embodiment of the present invention. Embodiment 4 This embodiment is a typical embodiment of the invention described in claim 7, and will be described together with the typical embodiment of the invention described in claims 10 and 11. The configuration different from the first embodiment is that the heating element 14 is a pipe heater 15 </ b> A embedded inside the louver plate 11. In this case, the heater 15A does not necessarily have to be a pipe or a rod, and a sheet or a linear heater is also included in this embodiment. In addition, the same reference numerals as those in the first embodiment have the same configuration and the same functions. The operation of this embodiment is a typical embodiment of the invention described in claim 3.
In the winter season, the louver plate 11 is evenly heated from the inside to the entire surface by the embedded heater 15A to heat the external air flowing between the louver plates 11 to prevent icing at the louver plate 15 and to freeze ice. Thaw the icicles.

[0018]

According to the first, second, third and fourth aspects of the present invention, the icicles frozen between the louver plates can be easily and quickly melted and removed from the louver plates.

According to the fifth aspect of the invention, the method of the first aspect can be implemented and its effects can be exhibited. According to the sixth aspect of the present invention, in addition to the above-described effects, it is possible to generate or remove icing by appropriately heating the louver plate at the time of icing. The invention according to claim 7 can implement the method invention according to claim 3 and exert its effect. In addition, the surface of the louver plate has no unevenness due to a heater, and the louver surface becomes smooth, thereby reducing the load on the blower. You can thaw icicles without raising them. The invention according to claim 8 can implement the method invention according to claim 2 and exert its effects. In addition, the method can reduce the ice column without increasing the load on the blower without increasing the thickness of the louver plate. Can be thawed. According to the ninth aspect of the present invention, the method of the fourth aspect can be implemented, and the effect can be exerted without an accident such as a short circuit. According to the tenth and eleventh aspects, the effects of the fifth, sixth, seventh, eighth, and ninth aspects can be exerted regardless of the orientation of the louver plate.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing the entire first embodiment.

FIG. 2 is a schematic front view showing the entirety of a second embodiment.

FIG. 3 is an enlarged vertical sectional view of a louver plate according to a third embodiment.

FIG. 4 is an enlarged vertical sectional view of the louver plate in FIG. 1;

FIG. 5 is an enlarged vertical sectional view of a louver plate according to a fourth embodiment.

[Explanation of symbols]

 A cooling tower 11 louver plate 14 heating element 15 sheet heater 19 blower

Claims (11)

[Claims] 1. An air blower provided at an exhaust port is rotated to draw an outside air flow into a cooling tower main body from between louver plates forming an outside air intake port, thereby removing circulating water or spray water sprayed on a heat exchanger. A method of operating a cooling tower that cools by indirect or direct contact with an airflow and exhausts air whose temperature has been raised from the exhaust port, wherein the louver plate is heated in winter and the external airflow flowing between the louver plates is heated. A method for operating a cooling tower, comprising: 2. The cooling tower operating method according to claim 1, wherein said louver plate is heated from its outer surface by a sheet heater. 3. The method according to claim 1, wherein said louver plate is heated from inside by a heater embedded therein. 4. The method according to claim 1, wherein said louver plate is heated with hot water. 5. A cooling tower in which a louver plate forming an outside air intake is disposed in a cooling tower body, wherein a heating element is provided on an outer surface or inside the louver plate. 6. The cooling tower according to claim 5, wherein said heating element is capable of generating heat at a time when ice formation can occur in winter, and heats an external airflow flowing between said louver plates. 7. The cooling tower according to claim 5, wherein the heating element is a heater embedded inside the louver plate. 8. The cooling tower according to claim 5, wherein the heating element is a sheet-shaped heater and is provided on the entire outer surface of the louver plate or the inner edge thereof. 9. The cooling tower according to claim 5, wherein a hot water passage is formed inside said louver plate. 10. A louver for a cooling tower, comprising a louver plate in the cooling tower according to claim 5, 6, 7, 8, or 9. 11. The louver plate may be horizontal or vertical.
2. An arrangement according to claim 1, wherein said arrangement is made at intervals.
0. A louver for a cooling tower according to 0.