JPH11201663A - Cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling tower friendly to environment to prevent breading of microorganism, such as algae and Legionella, even when circulation water staguatls in a tower body for a long period of time and prevent an adverse influence from being exercised on the ecosystem of animals and vegetables even when circulation water is discharged from a circulation route. SOLUTION: Circulation water is sprinkled from the upper part of a tower body 1 incorporating a filler 2. Outside air sucked from the outside of the tower body is brought into gas liquid contact with circulation water flowing down along the surface of the filler 2 to effect cooling. A device 8 is provided to inject a solution containing metallic ion, such as silver and copper, in a cooling and circulation route at every given time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling tower for cooling by bringing external air into contact with circulating water flowing down the surface of a filler, and more particularly to a cooling tower which stays in a tower body for a long time, such as algae, The present invention relates to a cooling tower that can prevent the propagation of pathogenic environmental microorganisms such as Legionella spp.

[0002]

2. Description of the Related Art In general, in a cooling tower in which circulating water is sprinkled from an upper part of a tower body containing a filler and cooled by bringing outside air sucked from outside the tower into contact with circulating water flowing down the surface of the filler. Pathogenic environmental microorganisms such as algae and Legionella sometimes proliferate in the circulating water staying in the tower.

[0003]

Therefore, conventionally, it has been practiced to sterilize microorganisms such as algae and Legionella spp. And to inject a chemical solution for suppressing generation at regular intervals. For example, a chlorine-based chemical is used as a disinfectant, but it is not effective in disinfecting algae. In addition, organic chemicals are used as algicides, but these chemicals, when released from the circulation route of circulating water, may adversely affect the ecosystem of animals and plants and destroy the natural environment. Was.

[0004] The present invention has solved the above-mentioned problem, and can prevent the propagation of microorganisms such as algae and Legionella even if circulating water stays in the tower for a long period of time. The present invention provides an environmentally-friendly cooling tower that does not adversely affect the ecosystem of animals and plants even if water is released from the circulation route.

[0005]

SUMMARY OF THE INVENTION According to the present invention, circulating water is sprinkled from the top of a tower body containing a filler, and outside air sucked from outside the tower is brought into gas-liquid contact with the circulating water flowing down the surface of the filler. In a cooling tower for cooling by cooling, a solution containing metal ions such as silver and copper is injected into a circulation path of circulating water at predetermined time intervals.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view of a cooling tower showing one embodiment of the present invention. In the figure, reference numeral 1 denotes a tower body, and on both sides of the tower body 1, a filler 2 formed by laminating a large number of plastic sheets having a concavo-convex pattern is disposed. Louvers 11 are provided.

A sprinkling tank 3 is provided above the tower 1 in which the filler 2 is disposed.
A fan 4 is provided between 3. In addition, countless small holes are formed in the bottom wall of the water spray tank 3, and circulating water is sprayed from each small hole to the filler 2. Filling material 2
Circulating water is cooled by contacting the outside air flowing in from the louver 11 while flowing down the surface of the plastic sheet constituting the filler 2, and falls into the water receiving tank 5 provided below the tower 1. I do. On the other hand, the humid air in the tower body 1 is discharged out of the tower body by the fan 4 provided above the tower body 1.

[0008] The circulating water dropped into the water receiving tank 5 is sent to the heat exchanger 7 via the pipe 6a, where the heat is exchanged by the heat exchanger 7 to become warm. This circulating water is sent to the sprinkling tank 3 via the pipe 6b. In the cooling and circulating route of the circulating water described above, if the circulating water stays in the tower for a long time, algae are generated by photosynthesis. In addition, microorganisms from the environment having pathogenicity such as Legionella spp. May propagate.

In the cooling tower of the present invention, an injection device 8 is installed in a pipe 6b, and a solution containing metal ions such as silver and copper is injected from the injection device 8 into circulating water at predetermined time intervals. The circulating water is sterilized or sterilized by the sterilizing action of metal ions such as silver and copper to prevent the growth of algae and Legionella spp. At this time, a solution containing only silver ions or only copper ions may be injected into the circulating water,
In consideration of the bactericidal effect and cost, it is preferable to inject a solution containing silver ions and copper ions. According to experiments,
Silver ion is more than 4ppm and copper ion is 300 in circulating water.
It was confirmed that when the concentration was controlled to be not less than ppm, Legionella bacteria could be sterilized.

FIG. 1 shows an example in which a solution containing metal ions such as silver and copper is injected into the circulating water flowing into the sprinkling tank 3 via the heat exchanger 7. It is not limited to. An injection device 8 may be installed in the tower 1 and a solution containing metal ions such as silver and copper may be injected into the circulating water falling into the water receiving tank 5 at predetermined time intervals. The effect is obtained.

[0011]

As described in detail above, the cooling tower of the present invention has the following features.
A solution containing metal ions such as silver and copper is injected into the circulation path of the circulating water at predetermined time intervals to sterilize the circulating water. It is possible to prevent the propagation of pathogenic microorganisms derived from the environment. Further, the solution containing metal ions such as silver and copper does not adversely affect the ecosystem of animals and plants even if released from the circulation route, and does not destroy the natural environment.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a cooling tower showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tower body 2 Filling material 3 Sprinkling tank 4 Fan 5 Water receiving tank 8 Injection device

Claims (1)

[Claims] 1. A cooling tower, in which circulating water is sprinkled from an upper part of a tower body containing a filler and cooled by bringing external air sucked from outside the tower into gas-liquid contact with circulating water flowing down the surface of the filler. A cooling tower wherein a solution containing metal ions such as silver and copper is injected into a water circulation path at predetermined time intervals.