JP2014240739A - Cooling tower system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and reliably prevent generation of scale and red rust.SOLUTION: A cooling tower system comprises: a heat exchanger; a cooling tower; a water storage tank; and a magnetizing device 7 arranged inside the water storage tank. Magnets are arranged on magnetizing units 21 and 31 of the magnetizing device 7 and a cooling water passage is formed in a region where a magnetic field is generated by the magnets. The cooling water is ionized (O,OH) by the magnetic field when the same is pumped and sent to the magnetizing units 21 and 31 by a pump 11 and thereby allowing a scale component in the cooling water to be separate and precipitated. The ionized water is discharged from the magnetizing device 7 into the water storage tank and then supplied to the cooling tower. By circulating the ionized water in a circulation passage including the heat exchanger and the cooling tower, ions (O,OH) remove scale attached to piping and prevent generation of red rust.

Description

  The present invention relates to a cooling tower system including a heat exchanger, a cooling tower, and a water supply tank in which water supplied to the cooling tower is stored.

  In heat exchangers such as building air conditioners and district air conditioning equipment, cooling water is used to cool the high-temperature heat medium. In recent years, used cooling water is reused by cooling it with a cooling tower and supplying it again to the heat exchanger.

  In the cooling tower, the cooling water and the outside air (air) are brought into direct contact, and the remaining cooling water is cooled by latent heat (heat of vaporization) generated by evaporation of a part of the cooling water. The cooling water is circulated between the heat exchanger and the cooling tower while supplying the cooling tower with water corresponding to the evaporated cooling water amount.

As the cooling water, tap water, groundwater, or the like is used, and these waters contain scale components such as calcium, magnesium, and silica. The scale component does not evaporate and adheres to the cooling water circulation path to block the piping. Further, when iron oxide (Fe (OH) ₂ ) contained in the cooling water reacts with active oxygen, red rust is generated and the piping and the like are blocked. As a result, the amount of cooling water sent to the heat exchanger decreases, so that the heat exchange rate decreases.

  Therefore, methods for suppressing the occurrence of scale and red rust have been proposed. For example, (1) a method of adding a chemical to cooling water (Patent Document 1), (2) a method of electrolyzing cooling water (Patent Document 2), (3) a circulation path between a cooling tower and a heat exchanger ( There is a method of attaching a magnet to the piping).

  In Patent Document 1, a chemical and a scale are chemically reacted to dissolve and remove the scale.

  Moreover, in patent document 2, a scale component ionizes by electrolysis and adheres to an electrode cover (cover which covers an electrode). By collecting this, the scale component is removed.

  Furthermore, in the method (3), the scale fixed to the inner surface of the pipe is softened by the magnetic force, and the blockage of the pipe is suppressed.

JP 2003-262494 A JP 2006-61844 A

  However, in the above method (1), it is necessary to regularly add a drug, and therefore the running cost is increased. In addition, after the addition, it is necessary to manage the concentration in the cooling water, which requires complicated work.

  Furthermore, in the method (2), it is necessary to remove the scale from the electrode cover. Moreover, since the electrode is a consumable item, it is necessary to replace it with a new electrode after use, which increases the running cost.

  On the other hand, in the method (3), there is little concern about cost as in (1) and (2), but the softened scale flows through the circulation path and adheres to the pipe again, thereby blocking the pipe. In addition, since the amount of softening of the scale differs depending on conditions such as the pipe diameter, the cooling water speed passing through the pipe, and the flow rate, a sufficient effect may not be obtained.

  Therefore, an object of the present invention is to provide a cooling tower system that can easily and reliably suppress the occurrence of scale and red rust while suppressing running costs.

The cooling tower system of the present invention is
A heat exchanger for exchanging heat between the cooling water and a refrigerant having a temperature higher than that of the cooling water, a cooling tower for cooling the cooling water heat-exchanged by the heat exchanger, and water supply in which cooling water to be supplied to the cooling tower is stored A tank, a magnetizer arranged in the cooling water in the water supply tank, and a pump arranged in the water supply tank and supplying the cooling water in the water supply tank to the magnetizer,
The magnetizer includes a magnet and a cooling water passage formed in a region where a magnetic field is generated by the magnet.

According to the present invention, the cooling water in the storage tank is ionized by passing through the region where the magnetic field is generated (H ⁺ , OH ⁻ ), and the scale components (calcium, magnesium, silica, etc.) contained in the cooling water are separated by settling. To do. Thereby, concentration of a scale component is suppressed in a storage tank, and the scale component in cooling water can be kept below these solubility. Since such cooling water is supplied to the cooling tower and circulates between the cooling tower and the heat exchanger, adhesion of scale in the circulation path can be suppressed.
Moreover, since the generated ions collide with the scale (calcium, magnesium, silica, etc.) attached to various members and peel off the scale, the amount of scale attached can be reduced.
Furthermore, red rust (Fe ₂ O ₃ ) is produced by the reaction of iron oxide (Fe (OH) ₂ ) in water with active oxygen (O ₂ ),
2Fe (OH) ₂ + 1 / 2O ₂ → Fe ₂ O ₃ (red rust) + 2H ₂ O (a)
Since ions (H ⁺ ) generated in the magnetizer react with active oxygen (O ₂ ),
1 / 2O ₂ + 2H ⁺ → H ₂ O
The reaction of the above formula (a), that is, the reaction between iron oxide (Fe (OH) ₂ ) and active oxygen (O ₂ ) can be suppressed. As a result, the occurrence of red rust can be suppressed. In addition, the red rust that has already occurred is reduced by ions to become black rust (Fe ₃ O ₄ ).
Fe ₂ O ₃ (red rust) ⇒4 Fe ₃ O ₄ (black rust)
Since black rust is a strong film that protects piping and the like from corrosion, corrosion of various members can be suppressed.
Furthermore, in the present invention, since it is only necessary to install a magnetizer in the water supply tank and to flow cooling water into the magnetizer, it is possible to easily and surely suppress the generation of scale and red rust while suppressing running costs.

  Moreover, in this invention, it is preferable that the said several magnet is arrange | positioned facing each other on both sides of the said channel | path. Since the magnetic field strength in the passage can be increased by sandwiching the passage of the cooling water with the magnet, the cooling water can be reliably ionized. Thereby, generation | occurrence | production of a scale and red rust can be suppressed effectively.

  In the above configuration, it is preferable that different magnetic poles are arranged to face each other across the passage. By sandwiching the cooling water passage with different magnetic poles, the magnetic field strength in the passage can be increased, so that the cooling water can be reliably ionized. Thereby, generation | occurrence | production of a scale and red rust can be suppressed effectively.

  Further, it is preferable that the same magnetic poles of different magnets are adjacent to each other in a direction parallel to the extending direction of the passage, and a first member having no magnetism is disposed between the adjacent magnetic poles. Although adjacent magnetic poles repel each other and try to move in a direction in which the adjacent magnets repel, movement of the magnets can be suppressed by the first member.

  Moreover, it is preferable that the said magnetizer further has the metal tube arrange | positioned surrounding the said magnet. Since it is possible to prevent the magnetic field from leaking to the outside by the metal tube, it is possible to prevent the magnetic field strength in the magnetizer (in the metal tube) from being weakened.

  The magnetizer further includes a metal tube disposed around the magnet, and a second member that covers a surface of the magnet that faces the metal tube, and the second member is magnetic. It is preferable that the first member is fixed to the first member. The second member can prevent the magnet from being attracted to the metal tube.

  According to the present invention, the cooling water is ionized in the magnetizer, whereby the scale in the cooling water is settled and separated, and the concentration of the scale components can be suppressed. Even if such cooling water flows through the circulation path between the cooling tower and the heat exchanger, the scale component is unlikely to adhere to the circulation path. Moreover, since the said ion collides with the scale adhering to various members, a scale is peeled off, and it reacts with the active oxygen which becomes a red rust generation factor, Therefore A scale adhesion and generation | occurrence | production of red rust can be suppressed. Furthermore, since these effects can be obtained simply by disposing a magnetizer in the water supply tank, the generation of scale and red rust can be easily and reliably suppressed while suppressing running costs.

It is a mimetic diagram showing the whole cooling tower system composition concerning the embodiment of the present invention. (A) is sectional drawing of the magnetization apparatus shown in FIG. 1, (b) is another sectional drawing of the magnetization apparatus. (A) is a sectional view of the magnetizer, (b) is another sectional view of the magnetizer (a sectional view taken along the line IIIb-IIIb in (a)), and (c) is a perspective view of the core and the magnet. FIG. It is a schematic diagram in a magnetizer. (A) is a perspective view of the core and magnet of the magnetizer of modification 1, (b) is a sectional view which followed the Vb-Vb line of (a). (A) And (b) is a schematic diagram in the magnetizer of another modification. It is a schematic diagram in the magnetizer of another modification.

  Hereinafter, embodiments of the present invention will be described.

  Here, the cooling tower system which is one Embodiment of this invention is demonstrated, referring FIGS.

  As shown in FIG. 1, the cooling tower system 100 includes a heat exchanger 1 provided in a building air conditioner, a district air conditioner or the like, a cooling tower (cooling tower) 2 that cools cooling water used in the heat exchanger 1, and a cooling tower. 2 is provided with a water supply tank 3 for supplying water. The water supply tank 3 stores tap water, groundwater, and the like.

  The heat exchanger 1 and the cooling tower 2 are connected by a first pipe 4 and a second pipe 5, and a cooling water circulation path is formed by the heat exchanger 1, the cooling tower 2, the first pipe 4 and the second pipe 5. . The cooling tower 2 and the water supply tank 3 are connected by a third pipe 6.

  In the heat exchanger 1, heat is exchanged between the cooling water and the hot refrigerant having a temperature higher than that of the cooling water. The used cooling water passes through the first pipe 4 and is sent to the cooling tower 2 to be cooled. Thereafter, the cooled water passes through the second pipe 5 and is sent to the heat exchanger 1 again. Thus, the cooling water circulates in the order of heat exchanger 1 → first pipe 4 → cooling tower 2 → second pipe 5 → heat exchanger 1 → first pipe 4 →.

  In the cooling tower 2, the cooling water sent from the first pipe 4 is sprinkled from above. Most of the sprinkled cooling water is stored at the bottom of the cooling tower 2, but a part is warmed by the air sucked from the intake ports 2 a, 2 b. The remaining cooling water (water sprayed or stored in the bottom) is cooled by the latent heat (heat of vaporization) generated at this time.

  In addition, the cooling tower 2 is supplied with cooling water corresponding to the amount of evaporated and scattered cooling water from the water supply tank 3 via the third pipe 6. The replenished water is stored at the bottom of the cooling tower 2.

  Next, the structure in the water supply tank 3 is demonstrated, referring FIGS. 1-3.

  A magnetizing device 7 is disposed at the bottom of the water supply tank 3. The magnetizing device 7 is arranged in a housing 9 placed on a table 8. The housing 9 is disposed in the cooling water and is sealed so that the cooling water does not enter inside. The magnetizing device 7 is connected to a power supply device 10 disposed on the water supply tank 3.

  As shown in FIGS. 2A and 2B, the magnetizing device 7 includes a pump 11 that pumps cooling water in the water supply tank 3, and two cylindrical magnetizers 21 that are arranged at a higher position than the pump 11. 31. The pump 11 and the magnetizers 21 and 31 are connected by a T-shaped pipe 12 and L-shaped pipes 13 and 14 connected to two outlets of the pipe 12. In addition, the magnetizers 21 and 31 communicate with the outside of the housing 9 through pipes 15 and 16 extending upward, respectively. The pump 11 is connected to the power supply device 10 shown in FIG. 1, and the operation of the power supply device 10 can control the ON / OFF operation of the pump 11 and the pumping amount.

  The cooling water pumped up by the pump 11 passes through the pipe 12, is divided into a pipe 13 and a pipe 14, and flows to the magnetizers 21 and 31 ahead. The cooling water that has passed through the magnetizers 21 and 31 passes through the pipes 15 and 16 and is discharged out of the housing 9.

  Next, the magnetizers 21 and 31 will be described in detail with reference to FIGS. In addition, since the magnetizer 21 and the magnetizer 31 are the same structures, the magnetizer 21 is demonstrated below and description of the magnetizer 31 is abbreviate | omitted.

  As shown in FIG. 3A and FIG. 3B, the magnetizer 21 holds a metal core 41 made of metal, a cylindrical core 42 disposed therein, and the core 42 from above and below. C-shaped retaining rings 43, 44, a spacer 45 disposed above the retaining ring 43, and a spacer 46 disposed below the retaining ring 44. The retaining rings 43 and 44 can prevent the core 42 from coming off the metal tube 41. The core is made of a material having no magnetism, for example, a resin.

  As shown in FIGS. 3A to 3C, the core 42 is formed with a hole 42a penetrating in the axial direction. The hole 42a serves as a cooling water passage. The core 42 is formed with three holes 51, 52, 53 that are recessed toward the center of the diameter and three holes 54, 55, 56 at positions that are axially symmetric with respect to the core 42. (See FIG. 3B). The holes 51, 52, 53 are formed side by side in the vertical direction. The holes 54, 55, and 56 are also formed side by side in the vertical direction.

  Therefore, the hole 51 and the hole 54 face each other, the hole 52 and the hole 55 face each other, and the hole 53 and the hole 56 face each other. Here, the vertical direction is the extending direction of the hole 42a (cooling water passage).

  In the holes 51, 52, 53, rectangular parallelepiped magnets 61, 62, 63 are arranged, respectively. In addition, rectangular parallelepiped magnets 64, 65, and 66 are disposed in the holes 54, 55, and 56, respectively. The core 42 exists between magnets adjacent in the vertical direction (for example, between the magnet 61 and the magnet 62 and between the magnet 62 and the magnet 63). For example, the core interposition part 42 </ b> A (first member) is disposed between the magnet 61 and the magnet 62, and the core interposition part 42 </ b> B (first member) is disposed between the magnet 62 and the magnet 63. The core interposition part extends in the radial direction.

  The magnets 61, 62, and 63 and the magnets 64, 65, and 66 are opposed to each other in the radial direction with a hole 42a that is a passage of cooling water interposed therebetween (see FIG. 3A). Specifically, the magnet 61 and the magnet 64 face each other, the magnet 62 and the magnet 65 face each other, and the magnet 63 and the magnet 66 face each other.

  The surfaces of the magnets 61, 62, 63, 64, 65, 66 facing the metal tube 41 are covered with the core 42. For example, the surface of the magnet 61 facing the metal tube 41 is covered with the covering portion 42L (second member). The upper end of the covering portion 42L is fixed to the upper end portion of the core 42, and the lower end is fixed to the core interposition portion 42A. The surface of the magnet 62 facing the metal tube 41 is covered with a covering portion 42M (second member). The upper end of the covering portion 42M is fixed to the core interposition portion 42A, and the lower end is fixed to the core interposition portion 42B. In FIG. 3C, the covering portion is omitted.

  From the above configuration, the magnets 61, 62, 63, 64, 65 and 66 hardly move in the axial direction (vertical direction) and the radial direction of the core 42. Therefore, even if magnets adjacent to each other in the vertical direction repel each other (for example, even if the magnet 61 and the magnet 62 repel each other), or even if a force for attracting the magnet to the metal tube 41 is applied, the core 42 is interposed. The magnets 61, 62, 63, 64, 65, 66 hardly move by the portions 42A, 42B and the covering portions 42L, 42M.

  As shown in FIG. 4, the magnets 61, 62 and 63 are arranged such that the S pole is closer to the hole 42 a than the N pole. The N poles of the magnets 61, 62, and 63 are arranged in the vertical direction, and the S poles are arranged in the vertical direction.

  On the other hand, the magnets 64, 65, and 66 are arranged such that the N pole is closer to the hole 42a than the S pole. The N poles of the magnets 64, 65, 66 are arranged in the vertical direction, and the S poles are arranged in the vertical direction.

  From the above configuration, the S pole of the magnet 61 and the N pole of the magnet 64 are opposed to each other with the hole 42a (cooling water passage) interposed therebetween, and the S pole of the magnet 62 and the N pole of the magnet 65 are opposed to each other with the hole 42a interposed therebetween. The south pole of the magnet 63 and the north pole of the magnet 66 are opposed to each other with the hole 42a interposed therebetween. A magnetic field is generated from the N pole of the magnet 64 toward the S pole of the magnet 61, a magnetic field is generated from the N pole of the magnet 65 toward the S pole of the magnet 62, and from the N pole of the magnet 66 to the S pole of the magnet 63. A magnetic field is generated. The hole 42a (cooling water passage) is formed in a region where the magnetic field is generated.

The present inventors have found that the following phenomenon occurs when cooling water flows in a region where a magnetic field is generated.
(A) The cooling water is ionized (H ⁺ , OH ⁻ ), and scale components (calcium, magnesium, silica, etc.) contained in the cooling water are precipitated and separated.
(B) The ions (H ⁺ , OH ⁻ ) collide with the scale attached to each member such as a pipe and peel off the scale.
(C) When iron oxide (Fe (OH) ₂ ) in cooling water reacts with active oxygen (O ₂ ) in cooling water, red rust (Fe ₂ O ₃ ) is generated.
2Fe (OH) ₂ + 1 / 2O ₂ → Fe ₂ O ₃ (red rust) + 2H ₂ O (a)
By reacting the ions (H ⁺ ) with active oxygen (O ₂ ),
1 / 2O ₂ + 2H ⁺ → H ₂ O
Since the reaction of the formula (a) can be suppressed, generation of red rust (Fe ₂ O ₃ ) can be suppressed.
(D) Red rust (Fe ₂ O ₃ ) that has already been generated is reduced by the above ions to become black rust (Fe ₃ O ₄ ).
Fe ₂ O ₃ (red rust) ⇒ Fe ₃ O ₄ (black rust)
Black rust is a strong film that protects pipes from corrosion and protects various members from corrosion.

  From the above, in the water supply tank 3 shown in FIG. 1, by operating the magnetizing device 7, the scale components (calcium, magnesium, silica, etc.) in the cooling water are settled and separated. Thereby, in the water supply tank 3, concentration of a scale component is suppressed and the scale component in cooling water can be kept below these solubility. Even if such cooling water is supplied to the cooling tower 2 and circulates through the circulation path of the cooling tower 2, the second pipe 5, the heat exchanger 1, and the first pipe 4, the scale hardly adheres to the circulation path. Therefore, the cooling tower system of the present invention can suppress the adhesion of scale.

In addition, when ionized cooling water (H ⁺ , OH ⁻ ) is supplied to the cooling tower 2 and circulates in the circulation path of the cooling tower 2, the second pipe 5, the heat exchanger 1, and the first pipe 4, ions (H ⁺ , OH) ^- ) Collides with the scale adhering to the piping etc., and peels off the scale. Thereby, adhesion of the scale to the circulation path can be reduced. Furthermore, the occurrence of red rust can be suppressed by ions (H ⁺ ), and the red rust in which ions (OH ⁻ ) have already been generated is changed to black rust, so that corrosion of various members can be suppressed.

  Moreover, in this embodiment, since the magnetizers 21 and 31 need only be installed in the water supply tank 3 and the cooling water only needs to flow through the magnetizers 21 and 31, the scale and the scale can be easily and reliably suppressed while reducing running costs. The generation of red rust can be suppressed.

  Further, in the magnetizers 21 and 31, the magnetic field strength in the hole 42 a can be increased by sandwiching the coolant passage (hole 42 a) between the magnets 61, 62 and 63 and the magnets 64, 65 and 66. Thereby, since cooling water can be ionized reliably, generation | occurrence | production of a scale and red rust can be suppressed effectively.

  Further, in the magnetizers 21 and 31, the magnetic field strength in the hole 42a can be increased by sandwiching the coolant passage (hole 42a) between the N pole and the S pole. Thereby, since cooling water can be ionized reliably, generation | occurrence | production of a scale and red rust can be suppressed effectively.

  Furthermore, by surrounding the magnets 61, 62, 63, 64, 65, 66 with the metal tube 41, it is possible to prevent the magnetic field from leaking to the outside, so that the magnetic field strength in the magnetizers 21, 31 is reduced. Can be suppressed.

  Further, in the magnets 61, 62, 63 arranged in the vertical direction, the N poles are arranged in the vertical direction and the S poles are arranged in the vertical direction. 42 is disposed (for example, the core interposition portion 42A is disposed between the magnet 61 and the magnet 62, and the core interposition portion 42B is disposed between the magnet 62 and the magnet 63). The movement of the magnets 61, 62, 63 can be suppressed.

  Similarly, in the magnets 64, 65, 66 arranged in the vertical direction, the N poles are arranged in the vertical direction and the S poles are arranged in the vertical direction, so that adjacent magnets in the vertical direction repel each other. Since the core 42 is disposed on the magnet 64, the movement of the magnets 64, 65, 66 can be suppressed.

  Further, in the magnetizer 21, even if the force that draws the magnets 61, 62, 63, 64, 65, 66 from the metal tube 41 is applied, the covering portion of the core 42 (the covering portions 42L, 42M, etc. in FIG. 3A). Therefore, the movement of the magnets 61, 62, 63, 64, 65, 66 can be suppressed.

Here, an example of the conditions of the magnetizing apparatus will be described.
・ Speed of water passing through the magnetizers 21 and 31: 1 m / sec or more and 30 m / sec or less ・ Water passage time in the magnetizers 21 and 31: 1 ms or more ・ Magnetic field strength in the magnetizers 21 and 31: 100 mT or more 400mT
In addition, the speed of water, the passage time of water, and the magnetic field intensity are not limited to the above ranges and can be changed.

[Modification 1]
Next, Modification 1 of the present invention will be described with reference to FIG. In the first modification, the difference from the above embodiment is the configuration of the magnetizer (core and magnet). In FIG. 5, the metal tube 41, retaining rings 43 and 44, and spacers 45 and 46 of the magnetizer are omitted.

  The magnetizer 221 has a cylindrical core 242 disposed inside a metal tube (not shown). The core 242 is formed with a hole (cooling water passage) 242a penetrating in the axial direction, and a recess 243 is formed on the side.

  Further, the core 242 has four holes 251, 252, 253, 254 and four holes 255, 256, 257, 258 that are recessed toward the center of the diameter at positions where the core 42 is axially symmetric. Is formed. The four holes 251, 252, 253, and 254 are formed side by side in the vertical direction. Also, the four holes 255, 256, 257, 258 are formed side by side in the vertical direction (see FIG. 5B).

  Therefore, the hole 251 and the hole 255 face each other, the hole 252 and the hole 256 face each other, the hole 253 and the hole 257 face each other, and the hole 254 and the hole 258 face each other.

  The rectangular parallelepiped magnets 261, 262, 263, and 264 are disposed in the holes 251, 252, 253, and 254, and the rectangular parallelepiped magnets 265, 266, 267, and 268 are disposed in the holes 255, 256, 257, and 258, respectively. Yes. A core exists between magnets adjacent in the vertical direction. For example, the core interposition part 242A (first part) exists between the magnet 261 and the magnet 262, and the core interposition part 242B (first part) exists between the magnet 262 and the magnet 263.

  The magnets 261, 262, 263, and 264 and the magnets 265, 266, 267, and 268 are opposed to each other in the radial direction across the hole 242a (cooling water passage) (see FIG. 5B). Specifically, the magnet 261 and the magnet 265 face each other, the magnet 262 and the magnet 266 face each other, the magnet 263 and the magnet 267 face each other, and the magnet 264 and the magnet 268 face each other.

  The surfaces of the magnets 261, 262, 263, 264, 265, 266, 267, 268 facing the metal tube 41 are covered with the core 242. For example, the surface of the magnet 262 facing the metal tube 41 is covered with the covering portion 242L (second member). The upper end of the covering portion 242L is fixed to the core interposition portion 242A, and the lower end is fixed to the core interposition portion 242B. Thus, the coating | coated part which coat | covers a magnet is being fixed to the core interposition part. In FIG. 5A, the covering portion is omitted.

  As described above, the cores 242 (“core interposition part 242A”, “core interposition part 242B”, etc.) are arranged between the magnets arranged in the vertical direction, and the surface of the magnet facing the metal tube 241 is the core 242 ( “Coating portion 242L” etc.). Accordingly, the magnets 261, 262, 263, 264, 265, 266, 267, 268 hardly move in the axial direction (vertical direction) and the radial direction of the core 42.

  Further, as shown in FIG. 5B, the magnets 261, 262, 263, 264 are arranged at positions where the S pole is closer to the hole 242a than the N pole. The magnets 261, 262, 263, and 264 have N poles arranged in the vertical direction and S poles arranged in the vertical direction.

  On the other hand, in the magnets 265, 266, 267, 268, the N pole is disposed at a position closer to the hole 242a than the S pole. Therefore, also in the magnets 265, 266, 267, 268, the N poles are arranged in the vertical direction, and the S poles are arranged in the vertical direction.

From the above configuration, the S pole of the magnet 261 and the N pole of the magnet 265 are opposed to each other across the hole 242a (cooling water passage), and the S pole of the magnet 262 and the N pole of the magnet 266 are opposed to each other across the hole 42a. The S pole of the magnet 263 and the N pole of the magnet 267 are opposed to each other with the hole 42a interposed therebetween, and the S pole of the magnet 264 and the N pole of the magnet 268 are opposed to each other with the hole 42a interposed therebetween. Thereby, a magnetic field is generated from the N pole facing each other toward the S pole. When cooling water is passed through this region, the cooling water is ionized (H ⁺ , OH ⁻ ).

  As described above, also in the present modification, the generation of scale and red rust can be easily and reliably suppressed by suppressing the running cost by ionizing the cooling water with the magnetizer.

  The cooling water in a water supply tank was processed using the cooling tower system of this invention, and the state of the piping before a process and after a process, and the cooling water in a water supply tank were compared.

(Experimental conditions)
In order to suppress the adhesion of scale, a chemical (water treatment material) was periodically added to the water supply tank, and the effect (cooling water in the pipe inner wall surface and the water supply tank) was confirmed on July 5, 2012.
Thereafter, the addition of the drug was terminated, and two magnetizing devices were arranged in the water supply tank (see FIG. 1). The magnetizing apparatus was operated from July 27, 2012 to November 9, 2012. Here, "Twin Force 15A" (manufactured by Alpha Giken Co., Ltd.) is used for the magnetizer (core and magnet) of the magnetizing apparatus, and "Submersible Pump 32PL-6.15S" (manufactured by Teral Co., Ltd.) is used for the pump. It was. And the effect (cooling water in a pipe inner wall surface and a water supply tank) by a magnetizer was confirmed on November 9, 2012. Here, a pipe connecting the water supply tank and the cooling tower (corresponding to “third pipe 6” in FIG. 1) was used as the pipe to be investigated.

(Experimental result)
<Piping condition>
As of July 5, 2012, red rust was generated on the inner wall surface of the pipe (substantially the entire surface). Thus, the addition of chemicals could not sufficiently suppress the occurrence of red rust.
However, red rust changed to black rust on November 9, 2012 after installing the magnetizing device. This is presumably because the cooling water that passed through the magnetizer was ionized and the ions (OH ⁻ ) reacted with red rust.
<Cooling water in water tank>
On July 5, 2012, the cooling water in the water supply tank was black and cloudy. It is thought that the scale component could not be removed by adding the chemical, and the scale component in the cooling water was saturated.
On the other hand, on November 9, 2012 after installing the magnetizing device, the cooling water in the water supply tank was transparent. This is presumably because the scale components contained in the cooling water were separated by precipitation.

Moreover, when the cooling water was analyzed, the result of Table 1 was obtained.

Here, “dissolved oxygen” was measured using a dissolved oxygen meter.
Further, “pH” was analyzed using JIS K0102-12.1.
Furthermore, for “calcium concentration”, “silicon concentration”, “magnesium concentration” and “iron concentration”, the cooling water was filtered with 5C filter paper, and the cooling water after filtration was analyzed using an ICP emission spectroscopic analyzer.

  Usually, even if the chemical addition is continued, the effect is not sufficient, so that the concentration of scale components (calcium, silicon, magnesium) in cooling water and iron causing red rust increases. However, after installing the magnetizing apparatus, as shown in Table 1, calcium, silicon and iron in the cooling water could be reduced. Moreover, the magnesium concentration was not changed, and the increase could be suppressed.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in this embodiment, three magnets 61, 62, 63 (magnets 64, 65, 66) are arranged in a direction parallel to the extending direction of the cooling water passage (hole 42a). In Modification 1, the four magnets 261, 262, 263, 264 (magnets 265, 266, 267, 268) are arranged in a direction parallel to the extending direction of the cooling water passage (hole 242a). The number of magnets (the number of magnets arranged in parallel with the extending direction of the cooling water passage) may be two, or five or more. Moreover, only one magnet may be arranged.

  Furthermore, the arrangement of the magnets is not limited to that shown in the present embodiment and the first modification, and can be changed.

  For example, in the present embodiment and the first modification, two magnets (for example, the magnet 61 and the magnet 64) are disposed so as to face each other across the cooling water passage (hole 42a), but the two magnets face each other. You don't have to. For example, when two magnets are arranged adjacent to each other in the circumferential direction of the core, the N pole of one magnet faces the cooling water passage, and the S pole of the other magnet faces the cooling water passage, A magnetic field is generated from the north pole toward the south pole. By flowing cooling water through this region, the cooling water can be ionized.

  Moreover, in this embodiment and the modification 1, although one pole (N pole or S pole) of a magnet is arrange | positioned in the position near the channel | path of a cooling water rather than the other pole (S pole or N pole), As shown to 6 (a), you may arrange | position the N pole and S pole of one magnet in the position of the same distance from the channel | path of a cooling water. In FIG. 6A, two magnets 361 and 362 are arranged opposite to each other with a cooling water passage interposed therebetween. In the left magnet 361 in the figure, the south pole is disposed above the north pole. On the other hand, in the right magnet 362 in the figure, the N pole is disposed above the S pole. Then, the S pole of the left magnet 361 and the N pole of the right magnet 362 are opposed to each other across the coolant passage, and a magnetic field is generated from the N pole of the magnet 362 toward the S pole of the magnet 361. . Further, the N pole of the left magnet 361 and the S pole of the right magnet 362 face each other across the cooling water passage, and a magnetic field is generated from the N pole of the magnet 361 toward the S pole of the magnet 362. . Further, a magnetic field is also generated from the N pole of the magnet 361 toward the S pole, and a magnetic field is generated also from the N pole of the magnet 362 toward the S pole. By flowing the cooling water through such a region, the cooling water can be ionized.

  Further, in the present embodiment and Modification 1, different magnetic poles (N pole and S pole) are arranged facing each other across the cooling water passage (holes 42a, 242a), but the same magnetic poles face each other. May be.

  Furthermore, in the present embodiment and Modification 1, the same magnetic poles are arranged in the vertical direction, but different magnetic poles may be arranged in the vertical direction. For example, in FIG. 6B, magnets 461, 462, and 463 are disposed on the left side of the cooling water passage, and magnets 464, 465, and 466 are disposed on the right side of the passage. In the magnets 461, 462, and 463 on the left side of the passage, N poles and S poles are alternately arranged in the vertical direction. Also, in the magnets 464, 465, and 466 on the right side of the passage, the N pole and the S pole are alternately arranged in the vertical direction.

  The S pole of the magnet 461 and the N pole of the magnet 464 are opposed to each other with the coolant passage interposed therebetween, and a magnetic field is generated from the N pole toward the S pole. Further, the N pole of the magnet 462 and the S pole of the magnet 465 are opposed to each other with the cooling water passage therebetween, and a magnetic field is generated from the N pole toward the S pole. Further, the S pole of the magnet 463 and the N pole of the magnet 466 are opposed to each other with the cooling water passage therebetween, and a magnetic field is generated from the N pole toward the S pole. The cooling water can be ionized by flowing the cooling water through such a region.

  Further, in the present embodiment and the first modification, the two magnets are arranged so as to face each other with the coolant passage interposed therebetween, but only one magnet 561 may be used as shown in FIG. In FIG. 7, semicircular magnets 661 are arranged along the circumferential direction outside the coolant passage. The N pole and S pole of the magnet 561 are opposed to each other with the cooling water passage interposed therebetween, and a magnetic field is generated from the facing N pole toward the S pole. By flowing cooling water through this region, the cooling water can be ionized.

  Furthermore, in the present embodiment and Modification 1, a core (core interposition part 42A) is provided between two magnets arranged in the vertical direction (for example, between “magnet 61” and “magnet 62” in FIG. 3C). ) Exists, but the core may not exist between the two magnets.

  Moreover, in this embodiment and the modification 1, although the magnetization apparatus has a metal tube, it does not need to have a metal tube.

  Furthermore, in the present embodiment and Modification 1, in the magnetizer, a core (for example, a surface facing the “metal tube 41” of the “magnet 62” in FIG. 3A) facing the metal tube of the magnet ( The covering portion 42L) is covered, but the surface of the magnet facing the metal tube may not be covered by the core or the like.

  Moreover, in this embodiment and the modification 1, as shown in FIG. 2, the magnetization apparatus 7 is provided with the two magnetizers 21 and 31, and the water pumped up from the pump 11 is sent to the two magnetizers 21 and 31. The number of magnetizers may be one or three or more.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Cooling tower 3 Water supply tank 4 1st piping 5 2nd piping 6 3rd piping 7 Magnetizer 11 Pump 21,31,221 Magnetizer 41 Metal tube 42,242 Core (1st insulating material)
42a, 242a hole (cooling water passage)
42A, 42B, 142A, 142B Core interposition part (first member)
42L, 42M, 142L Covering part (second member)
61, 62, 63, 64, 65, 66, 261, 262, 263, 264, 265, 266, 267, 268 Magnet 100 Cooling tower system

Claims (6)

A heat exchanger for exchanging heat between the cooling water and a refrigerant having a temperature higher than that of the cooling water;
A cooling tower for cooling the cooling water heat-exchanged by the heat exchanger;
A water supply tank in which cooling water to be supplied to the cooling tower is stored;
A magnetizer disposed in the cooling water in the water supply tank;
A pump that is disposed in the water supply tank and that supplies cooling water in the water supply tank to the magnetizer;
The magnetizer is
A cooling tower system comprising a magnet and a cooling water passage formed in a region where a magnetic field is generated by the magnet.   The cooling tower system according to claim 1, wherein the plurality of magnets are arranged to face each other across the passage.   The cooling tower system according to claim 2, wherein different magnetic poles are arranged to face each other across the passage. The same magnetic poles of different magnets are adjacent to each other in a direction parallel to the extending direction of the passage,
The cooling tower system according to any one of claims 1 to 3, wherein a first member having no magnetism is disposed between the adjacent magnetic poles. The magnetizer is
The cooling tower system according to claim 1, further comprising a metal tube disposed so as to surround the magnet. The magnetizer is
A metal tube disposed around the magnet;
A second member that covers a surface of the magnet facing the metal tube;
The cooling tower system according to claim 4, wherein the second member is made of a material having no magnetism and is fixed to the first member.

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