JP3080679B2 - cooling 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 tower in which a polymer film containing an antibacterial zeolite is mounted on a member which comes into contact with cooling water.

[0002]

2. Description of the Related Art In general, in a water-cooled apparatus, water from a condenser of a refrigerator is sent to an open-type cooling tower, where it is cooled by heat exchange by being brought into contact with the atmosphere. Sent to and recycled.

In this case, in the inside of the open type cooling tower, water is sent from the upper water tank to the gas-liquid contact filling portion, and falls as a water drop into the lower water tank. In the gas-liquid contact filling section, the air is sucked in by a blower, and heat is exchanged therewith.

In such an open type cooling tower, when inhaling the air, airborne bacteria and dust in the air are taken in and circulated together with the cooling water. In addition, the temperature of the water in the upper water tank is often around 32 ° C. suitable for the propagation of fungi, and in the filling section and the water tank inside the cooling tower, problems such as growth of bacteria, mold, and algae occur. I have. For this reason, a reduction in heat exchange efficiency, a decrease in the amount of flowing water, and the like have occurred, and the number of maintenance inspections of the apparatus has increased, which has been troublesome. Furthermore, in recent years,
In terms of hygiene, the generation of Legionella bacteria and the like from the cooling tower have become a problem.

[0005] In order to solve these problems, a water sterilization technique in a cooling tower such as irradiation of an ultraviolet lamp or introduction of an antibacterial agent has been known. One of them is JP-A-64-
No. 24860 discloses a method of applying an antibacterial zeolite having high safety to the human body as an antibacterial material. When this antibacterial zeolite is applied to a cooling tower, a method of directly kneading into each polymer molded member of the cooling tower is known.

[0006]

However, in the method in which this antibacterial zeolite is directly kneaded into the constituent members of the cooling tower, in the case of a thick polymer molded member, the antibacterial zeolite buried inside has an antibacterial effect. It was in a state where it was not involved at all and was not an efficient method.

For this reason, there has been proposed a method in which an antibacterial zeolite is mixed with a liquid polymer compound and applied thereto. In this method, however, the dispersion of the antibacterial zeolite in the liquid polymer compound tends to be non-uniform. In order to maintain continuous stability of the antibacterial effect, it is necessary to repeat application processing several times or the like, and there has been a problem that it is difficult to process.

[0008] The present invention has been proposed to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a stable and antibacterial zeolite effect which can be sustained by an easy processing method. An object of the present invention is to provide a cooling tower capable of simplifying maintenance and inspection of the apparatus without causing a decrease in cooling efficiency and a decrease in flowing water amount.

[0009]

Means for Solving the Problems In order to achieve the above object, the invention of claim 1 of the present application is directed to a filling section for enhancing contact of the water to be subjected to cold water with air, and a cooling section in the filling section. It has a water sprinkler for sprinkling water and a device for collecting water to be cooled from the filling section, and 0.5 to 5% by weight of antibacterial zeolite is blended on the surface of the member in contact with the water to be cooled. In the cooling tower provided with the polymer films laminated, the antibacterial zeolite contained in the polymer film has a particle size of 5 μm or less, and the film pressure of the polymer film is 50 μm or less. And stretching at a stretching ratio of 2.5 times or more so that the antibacterial zeolite is exposed on the surface of the polymer film.

[0010]

[0011]

[0012]

The operation of the present invention having the above configuration is as follows.

That is, according to the first aspect of the present invention, when the content of the antibacterial zeolite in the polymer film laminated on the surface of the member in contact with the water to be cooled is 0.5 to 5% by weight. In this case, bacteria, molds, and algae microorganisms that are propagated in the water to be cooled are antibacterial by the antibacterial zeolite, and their reproduction is suppressed. In particular, the particle size of the antibacterial zeolite contained in the polymer film laminated on the surface of the member in contact with the water to be cooled is 5 μm or less, and the polymer film has an antibacterial zeolite on its surface. Since the film is stretched at a stretching ratio of 2.5 times or more so as to be exposed, the amount of zeolite involved in the antibacterial action near the surface of the polymer film is sufficiently increased as compared with the case where the film is not stretched. The film pressure of this polymer film is 5
Since it is 0 μm or less, the amount of antibacterial zeolite that is not involved in the antibacterial effect on the cooling water in the polymer film is reduced.

[0014]

[0015]

[0016]

【Example】

(1) Representative Embodiment Hereinafter, the present invention will be described based on the embodiment shown in FIGS.

This embodiment includes the first to third aspects of the present invention.

That is, in the cooling tower of this embodiment, water tanks 1 and 2 are provided at the upper and lower parts, and a gas-liquid contact filling part (hereinafter referred to as a filling part) 3 is provided therebetween. On the inner surface of the upper water tank 1, a polymer film 5 containing zeolite is provided.
Are laminated by a laminating method or the like. Further, as shown in FIG. 2, the filling portion 3 is made of a plurality of fillers 3 of resin corrugated plates.
a polymer film 5 containing zeolite is laminated on both sides by a laminating method or the like. A sprinkler (not shown) for sprinkling water in the upper water tank 1 to the filling unit 3 and a blower 4 for sucking air and blowing the air to the filling unit 3 are provided above the filling unit 3. .

In such a cooling tower, the water in the upper water tank 1 is sprinkled by the sprinkler to the filling section 3 and falls slowly as water droplets on the surface of the filling material. At this time, the air sucked by the blower 4 is forcibly blown to exchange heat with water droplets, and the water droplets are cooled. The cooled water drops are dropped into the water tank 2 below the filling section 3, and this cycle is repeated.

The polymer film 5 mounted on the cooling tower as described above is composed of a film-forming organic polymer compound containing silver ions as a main component and having a particle diameter of 5 μm or less, preferably 0.1 μm or less.
It is obtained by mixing 0.5 to 5% by weight of an antibacterial zeolite of 3 to 2.0 μm by a conventional method, and forming the resulting mixture into a film by an extrusion method or the like. The antibacterial polymer film is further stretched to a thickness of 50 μm or less by a stretching operation.

The following antibacterial test was conducted to evaluate the antibacterial effect of the antibacterial polymer film.

First, silver 2%, zinc 5%, ammonium 4
% Antimicrobial zeolite is prepared. Next, a predetermined amount of the above-mentioned antibacterial zeolite was mixed with polypropylene (Showa Denko / Show Allomer FZ410).
The film is formed by an extrusion (T-die) method at ° C. Further, the film is processed into a film having a predetermined stretching ratio by a roll stretching machine.

[0023] Seven kinds of test pieces A were prepared by laminating the above-mentioned film on a filler (300 mm x 300 mm) of a cooling tower by a laminating method and prepared as A1 to A7. As a comparative example, a filler (300 mm × 300 mm)
B1 and B2 were prepared as comparative products B obtained by laminating a polymer film containing no antibacterial zeolite.
And

Each of the test product A and the comparative product B was 50 m
Two pieces each of which is cut out to m × 50 mm are prepared. An E. coli solution and a black Aspergillus fungus solution prepared at a bacterial count of 10 ⁵ cells / ml were prepared. Sprinkle with 1 ml. Escherichia coli was sprinkled at 37 ° C, and S. aspergillus was sprinkled at 20 ° C for 18 hours. The bacterial solution after culturing was washed out with sterilized saline, and the number of bacteria in this solution was measured to evaluate the antibacterial effect.

Table 1 shows the processing conditions of each of the polymer films of the test articles A1 to A7 and the comparative articles B1 and B2, and the results of the antibacterial test on the polymer films.

[0026]

[Table 1]

From the above results, the laminated film of the polymer film containing the antibacterial zeolite was sterilized,
Alternatively, it can be seen that the number of bacteria was drastically reduced as compared to the number of bacteria before culture, and that an excellent antibacterial effect was exhibited as compared with the comparative product. Further, since the antibacterial polymer film is stretched, the effect of the antibacterial zeolite is several times that of unstretched.

In the cooling tower on which the antibacterial polymer film of the present embodiment is mounted as described above, the propagation of microorganisms such as bacteria, molds and algae is suppressed for a long time by the polymer film of an easy processing method. You. Moreover, since this film is stretched, the antibacterial zeolite can be exposed several times on the film surface as compared to before the stretching operation, and the antibacterial zeolite contained in the film can be used efficiently. It is possible to achieve sufficient antibacterial activity stably. This makes it easy to perform maintenance and inspection of the apparatus without causing a decrease in the cooling efficiency of the cooling tower or a decrease in the amount of flowing water.

(2) Other Embodiments The cooling tower of the present invention is not limited to the above-described embodiment, and the specific shape of each member or the mounting position and method of each member can be appropriately changed. is there.

For example, the member on which the antimicrobial polymer film is laminated is not limited to the inner surface of the upper water tank and both surfaces of the filler, and may be laminated on all members in contact with water circulating for cooling. Thereby, an excellent antibacterial effect can be obtained.

Furthermore, in the boundary surface between water and air in the lower water tank, it is also possible to dispose the antibacterial zeolite 100 to 200 g / ^{m 3} containing antibacterial nonwoven fabric. This antibacterial nonwoven fabric prevents microorganisms in the air taken in by the blower in the upper filler portion from being taken into the water tank, and furthermore, stabilizes the growth of microorganisms in the water tank for a long time. Can be suppressed.

Further, the structure of the antimicrobial zeolite-containing polymer film to be mounted on the cooling tower of the present invention, the method of forming the same, and the stretching method are not limited to the above-described embodiments, and can be changed as appropriate. It is.

For example, the particle size and the mixing ratio of the antibacterial zeolite are not limited as long as the particle size is uniformly dispersed and exposed on the polymer film and a sufficient antibacterial effect can be obtained.

The antibacterial polymer film is not limited to polypropylene, and any film-forming organic polymer compound can be used without limitation. That is, ionomer resin, EEA resin, E
The film can be formed from VA resin, vinyl chloride resin, vinylidene chloride resin, chlorinated polyethylene, fluorine resin, polyamide resin, polysulfone, polyethylene, polystyrene, polyacrylate, polyurethane, polyethylene terephthalate, or the like.

Further, the method of forming the film is not limited to the extrusion method, but may be formed by a calendering method, a casting method, a vapor deposition method, a cutting method, or the like.

On the other hand, as a method for stretching a film, a polymer compound in a molten state is heated in a unidirectional manner at a temperature not higher than a melting point and not lower than a secondary transition point by an apparatus provided with a chain-shaped tenter having rolls and clips. Alternatively, the antibacterial film can be stretched by stretching in two directions.

The method of mounting the antibacterial polymer film on the cooling tower includes extrusion lamination,
In addition to lamination methods such as hot lamination, dry lamination and wet lamination, for example, heat sealing,
Thermal bonding methods such as ultrasonic bonding and high-frequency bonding, adhesive processing methods, and the like can be given, and any of them can be applied.

[0038]

As described above, according to the present invention, by easily processing a small amount of antibacterial zeolite, the growth of microorganisms such as bacteria, mold, and algae in the water to be cooled can be prolonged. , And the maintenance and inspection of the apparatus can be easily and simply performed without lowering the cooling efficiency and the amount of flowing water. In addition, the improvement of the cooling efficiency makes it possible to reduce the number of revolutions and the output of the blower, so that a cooling tower with reduced noise can be provided.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper water tank 2 Lower water tank 3 Filling part 3a Filler 4 Blower 5 Antibacterial film

Continuation of the front page (56) References JP-A-2-110298 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28F 25/08

Claims (1)

(57) [Claims] 1. A filling section for enhancing contact of air to be cooled with water, a sprinkler for spraying water to be cooled to the filling section, and an apparatus for collecting water to be cooled from the filling section. A cooling tower provided with a polymer film in which 0.5 to 5% by weight of antibacterial zeolite is blended on a surface of a member that is in contact with the water to be cooled; The antibacterial zeolite has a particle diameter of 5 μm or less, and the membrane pressure of the polymer film is 50 μm or less, and 2.5 times so that the antibacterial zeolite is exposed on the surface of the polymer film. A cooling tower, which is stretched at the stretching ratio described above.