JP2009275977A - Cooling tower system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling tower system capable of preventing condensation of minerals by keeping electric conductivity of the circulated water to a specific value or less though a system is simplified to be free from use of a water treatment agent such as a scale adhesion preventing agent and periodical blow (draining), preventing fixing of scale to a cooling tower and a cooling water circulating passage, further dispensing with compensation of shortage of the circulated water by the blow (draining), and significantly improving water-saving effect. <P>SOLUTION: This cooling tower system in the cooling water circulating passage 2 provided with the cooling tower 3, includes a water activating device 18 formed by putting ceramic particles fluidized by water flow of the circulated water in a container, and disposed in the cooling water circulating passage 2, and a separating section 4 disposed or formed in the cooling water circulating passage 2 for separating deposits of dissolved components of the circulated water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling tower system for preventing adhesion of scale in a cooling water circulation path in which a cooling tower is disposed.

A cooling tower is a type of heat exchanger that cools water or other heat medium directly or indirectly in contact with the atmosphere, and cools cooling water used in refrigerators, compressors, etc. in building air conditioning and district heating and cooling facilities. However, it is widely used to efficiently circulate and use cooling water.
Paying attention to the cooling method of cooling water 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 using the heat of vaporization caused by evaporation of some cooling water, and cooling There is a closed type in which water is passed through the pipe of the heat exchanger and outside air and spray water are sprinkled on the outside of the pipe for cooling, but an open type cooling tower is the mainstream. In the open type, a part of the cooling water evaporates and scatters due to the heat of vaporization in the cooling tower. Therefore, while always supplying water corresponding to the evaporated and scattered cooling water, a heat exchanger such as a refrigerator or a compressor is used. Generally, cooling water is circulated between the cooling towers.

As the cooling water, tap water, industrial water, groundwater, or the like is used. These waters always contain minerals such as calcium, magnesium and silica. Due to these minerals dissolved in the cooling water (circulation water), a scale is generated in the cooling water circulation water channel in the cooling tower and heat exchanger, and the heat exchange efficiency decreases due to clogging of the filler in the cooling tower. This may cause problems such as a decrease in heat exchange rate, malfunction in the heat exchanger, and blockage of the piping path.
In order to prevent or suppress these troubles, the equipment is shut down as part of regular maintenance for the purpose of removing the fixed scale, and in some cases, part of the equipment is dismantled and used physically or with chemicals. And cleaning was performed (for example, Patent Document 1).
Furthermore, for the purpose of suppressing or preventing the generation of scale in the circulating water, various chemicals have been administered into the circulating water (for example, Patent Document 2).
Further, (Patent Document 3) discloses a “method for suppressing / removing scale by bringing activated water that has been brought into contact with ceramic particles into contact with the scale, and then resolubilizing the scale that has been insoluble or hardly soluble in water”. Has been.
(Patent Document 4) states that “the active water brought into contact with the ceramic particles is used as makeup water for circulating water (supplements the evaporated water) to dissolve the scale that has adhered and deposited. A method for removing the scale to be peeled off and preventing adhesion is disclosed.
JP 2003-262494 A Japanese Patent Laid-Open No. 11-63746 Japanese Patent Laid-Open No. 11-319886 JP 2002-192171 A

However, the above conventional techniques have the following problems.
(1) The technology disclosed in (Patent Document 1) is a processing tank in which equipment is stopped, a cooling tower component (heat exchange coil) to which scale is attached is removed from a cooling tower, and a hydrochloric acid aqueous solution and an ammonium oxyfluoride aqueous solution are stored. This is a method that involves immersing the cooling tower parts in order to dissolve and remove the scale from the cooling tower parts, and it is complicated because it requires periodic maintenance to stop the equipment and dismantle part of the cooling tower. Wastewater treatment costs such as hydrochloric acid aqueous solution and ammonium oxyfluoride aqueous solution are required, and there is a problem that wastewater gives an environmental load.
(2) The technology disclosed in (Patent Document 2) suppresses the generation of scale by injecting a water treatment agent such as a scale adhesion inhibitor into cooling water. As mentioned earlier, some of the cooling water (circulated water) evaporates and disappears in the open cooling tower, but minerals such as calcium, magnesium, and silica that cause scale remain in the water. Even when a water treatment agent is injected, minerals are concentrated, leading to the generation of scale. Therefore, the conductivity of the circulating water is measured to detect the concentration rate of minerals. When the conductivity exceeds the set value, makeup water is supplied into the cooling tower to reduce the concentration rate, and the circulating water is blown. (Drainage) was performed. This increases the running cost of regularly injecting the water treatment agent, and also requires wastewater treatment costs when blowing (drainage) the circulating water into which the water treatment agent has been injected. Had the problem of giving.
(3) The technique disclosed in (Patent Document 3) is that the scale is easily solubilized in water as described in the right column, line 32 to line 37, on the second page of the official gazette. It dissolves in water and suppresses deposition. In addition, the technique disclosed in (Patent Document 4) dissolves, peels, and swells scales and slime (page 6, right column, lines 8 to 9). There is almost no sticking (Gazette page 3, left column, line 50 to right column, line 1). Thus, what is disclosed in (Patent Document 3) and (Patent Document 4) is a technique for preventing the adhesion of scale by dissolving the scale in circulating water. As mentioned earlier, in an open cooling tower, some of the cooling water (circulated water) evaporates and disappears, but minerals such as calcium, magnesium, and silica that cause scale remain in the water. The mineral content is concentrated over time, and the electrical conductivity increases (the fourth column, page 4, left column, lines 5 to 6). In the left column of lines 4 to 11 of Patent Document 4, it is described that “operation in a good state is possible even with high electrical conductivity”, but the electrical conductivity is increased and the mineral is increased. As the minute concentrates and approaches saturation, the scale becomes more likely to stick. Therefore, although it is described that “the amount of water to be discarded can be greatly reduced and a large amount of water can be saved” (Patent Document 4, page 4, left column, lines 10 to 12), Blow (drainage) and supply of insufficient water to reduce the concentration rate of minerals and lower the electrical conductivity of the circulating water. The water-saving effect was limited. In addition, it has been necessary to monitor the electrical conductivity of the circulating water and perform periodic blow (drainage), supply of makeup water, and the like, which requires a complicated operation.

  The present invention solves the above-described conventional problems, and is a simple system that does not use a water treatment agent such as a scale adhesion inhibitor or a regular blow (drainage), while maintaining a constant value for the conductivity of circulating water. Maintaining the following, it is possible to prevent the mineral content from being concentrated, prevent the scale from sticking to the cooling tower and cooling water circulation path, and it is not necessary to replenish the shortage of circulating water due to blow (drainage) An object of the present invention is to provide a cooling tower system that is remarkably excellent in water saving effect.

In order to solve the above conventional problems, the cooling tower system of the present invention has the following configuration.
The cooling tower system according to claim 1 of the present invention is a cooling tower system in a cooling water circulation path in which a cooling tower is disposed, and ceramic particles that are made to flow by the water flow of the circulating water are charged into the container, and the cooling water circulation path It has a configuration comprising an active water device that is disposed, and a separation unit that is disposed or formed in the cooling water circulation path and separates precipitates of dissolved components of the circulating water.
With this configuration, the following effects can be obtained.
(1) The present inventors introduce circulating water into the active water device and activate the circulating water by repeating friction and collision with each other while flowing the ceramic particles in the circulating water. It has been found that minerals such as calcium, magnesium, silica and the like are precipitated in a microcrystalline form in the cooling water circulation path. Crystals are precipitated because the circulating water is cationized by the active water device, so that CO ₂ (non-polar as a whole but the electron density is biased toward oxygen) and oxygen in the atmosphere are easily absorbed, and the circulating water It is presumed that dissolved minerals may be precipitated as crystals of CaCO ₃ , SiO ₂ , MgCO _3, etc. In addition, the precipitated crystals do not become scaled and fixed in the cooling water circulation path because the precipitated crystals are bonded with cationized water molecules, so that crystals charged with the same charge are bonded together and grow. It exists in a microcrystalline colloidal state, and the inside of the cooling water circulation path is positively charged. Therefore, it is presumed that the crystals are difficult to adhere to the piping wall of the cooling water circulation path.
(2) Since the separation unit is provided, precipitates floating in the circulating water in a colloidal state can be separated from the circulating water. By separating minerals such as calcium, magnesium and silica dissolved in the circulating water from the circulating water, the conductivity of the circulating water can be maintained below a certain value, and the mineral is prevented from being concentrated. As a result, it is not necessary to monitor the conductivity of the circulating water and perform periodic blow (drainage), the system of the cooling water circulation path provided with the cooling tower can be simplified, and the water saving effect is remarkably excellent. .
(3) Since CO ₂ in the atmosphere is easily absorbed by the circulating water, and the absorbed CO ₂ precipitates the minerals dissolved in the circulating water and is fixed to the precipitate, it can also be expected to have a warming countermeasure effect. .

Here, as the cooling tower, either an open type in which the cooling water and the outside air (air) are brought into direct contact or a closed type in which the cooling water is cooled by passing through the pipe of the heat exchanger can be used. Are preferably used. By bringing the cooling water (circulating water) and the outside air (air) into direct contact, the circulating water absorbs CO ₂ in the atmosphere, and the mineral content dissolved in the circulating water is crystallized such as CaCO ₃ , SiO ₂ , MgCO _3, etc. It is because it is easy to precipitate as.

  As the circulating water, tap water, industrial water, ground water, rain water, river water, ion exchange water, distilled water, and one selected from water derived therefrom or a mixed water thereof are used. If it is the water mentioned here or the water derived from them, the difference in a dissolved component will not be ask | required.

As the active water device, one in which ceramic particles are charged in a cylindrical container and circulating water is passed from the lower part to the upper part of the device is used. A water flow can be generated in the container, and the circulating water can be reformed by flowing, colliding and mutual friction of the ceramic particles.
The container of the active water device is required to have impact resistance, pressure resistance, heat resistance, cold resistance, chemical resistance, etc., but it is made of metal such as iron, aluminum, stainless steel, synthetic resin such as polycarbonate, vinyl chloride, acrylic resin, etc. The product etc. can be used.

As the ceramic particles, those produced by granulating and firing oxide-based ore powder containing oxides such as silica, alumina, alkali metal, alkaline earth metal and the like are used.
The ratio of silica to alumina is suitably 10 to 95 parts by weight, preferably 20 to 80 parts by weight of alumina with respect to 100 parts by weight of silica. As alumina becomes less than 20 parts by weight, the mechanical strength of the ceramic particles tends to decrease, and as it becomes more than 80 parts by weight, the firing temperature required to obtain a predetermined mechanical strength increases, resulting in energy savings. There is a tendency to lack. In particular, when the amount is less than 10 parts by weight or more than 95 parts by weight, these tendencies become remarkable, so that neither is preferable.

The ceramic particles are formed to have a specific surface area of 0.01 to ¹ m ² / g, an apparent density of 1.6 to 3.5 g / cm ³ , and a particle size of 0.1 to 10 mm according to the BET method. Is preferred.
As the specific surface area becomes smaller than 0.01 m ² / g, the contact area with the circulating water tends to decrease and the reforming efficiency tends to decrease. As the specific surface area becomes larger than 1 m ² / g, the ceramic particles become brittle and the particles become There is a tendency for durability to deteriorate during wear.
As the apparent density becomes smaller than 1.6 g / cm ³ , the mechanical strength of the particles decreases, and the particles tend to wear or chip when they collide with each other. It tends to be difficult to do so, and as it becomes larger than 3.5 g / cm ³ , since the sedimentation rate is fast, the particles are difficult to flow in water, and an active fluid state cannot be obtained, and there is a tendency for the water reforming effect to decrease. .
As the particle size becomes smaller than 0.1 mm, the kinetic energy of the flowing ceramic particles is small, so that the effect of modifying the circulating water when the ceramic particles collide tends to be reduced. There is a tendency that the energy required to fluidize the particles increases, the number of collision points between the particles decreases, and the modification effect due to the collision of the particles decreases.

  The amount of the ceramic particles charged into the container is suitably 10 to 80 vol%, preferably 20 to 70 vol%, based on the volume of the space in which the ceramic particles can flow in the container. As the volume of the flowable space becomes smaller than 20 vol%, the energy generated during the collision and mutual friction between particles tends to decrease, and as the volume exceeds 70 vol%, the friction between the particles and the number of collisions decrease. This is not preferable because the tendency to On the other hand, if it is smaller than 10 vol% or exceeds 80 vol%, these tendencies are further increased, which is not preferable.

In order to allow the ceramic particles to flow properly, the circulating water flowing in the container needs a constant flow rate. Although it varies depending on the particle size of the particles, the flow rate is preferably in the range of 1 cm / sec to 15 cm / sec. Specifically, although it depends on the specific gravity and size diameter of the ceramic particles, the particle diameter of the ceramic particles is 2 to 4 cm / sec for 1 mm, 5 to 6 cm / sec for 2 mm, and 8 to 10 cm for 3 mm. / Sec is appropriate.
When the flow rate is lower than 1 cm / sec or higher than 15 cm / sec, the flow of the ceramic particles becomes poor or does not flow, and the activation effect of the circulating water is lowered.

  The active water device may be disposed anywhere in the cooling water circulation path, but is preferably disposed upstream of the location where scale adhesion is a problem. In the case of an open type cooling tower, the scale is likely to adhere to the filler disposed in the cooling tower. Therefore, the active water device is preferably disposed in the inflow path through which the circulating water flows into the cooling tower. In addition, by providing a plurality of active water devices in the cooling water circulation path, further scale adhesion prevention or scale adhesion suppression effects can be expected.

Any separator can be used without particular limitation as long as it separates the precipitate from the circulating water by gravity, centrifugal force, adsorption, filtration or the like. For example, a pipe that is thicker than the pipe diameter of the cooling water circulation path is provided in a substantially vertical direction, and the circulating water flows from the lower part to the upper part of the pipe. As a result, the flow rate in the pipe becomes lower than the flow rate in the other cooling water circulation path, and the precipitate can be precipitated and deposited in the lower part of the pipe by gravity, and can be separated from the circulating water. By providing a baffle plate or the like in the pipe, precipitation / deposition of precipitates can be promoted.
Moreover, the lower pan part of the inner bottom part of a cooling tower can also be used as a separation part. This is because circulating water stays in the lower pan portion and becomes slower than the flow rate of the cooling water circulation path.
Moreover, a liquid cyclone can also be used as a separation part. The precipitate can be guided from the peripheral wall of the hydrocyclone to the bottom nozzle by centrifugal force and separated from the circulating water.
A filter, a strainer, or the like can also be used as the separation unit. By using a filter, strainer, or the like having a mesh opening or a channel diameter smaller than the particle size of the precipitate, the precipitate can be captured and separated from the circulating water.
A plurality of these separation units can be combined.

Invention of Claim 2 of this invention is a cooling tower system of Claim 1, Comprising: The cross-sectional area of the flow path of the said isolation | separation part has a structure wider than the piping cross-sectional area of the said cooling water circulation path. Yes.
With this configuration, in addition to the operation obtained in the first aspect, the following operation can be obtained.
(1) Since the flow rate of circulating water flowing through the separation section can be made slower than the flow rate of circulating water flowing through the cooling water circulation path, precipitates can be precipitated and deposited by gravity and separated from the circulating water. .

  Here, the cross-sectional area of the flow path of the separation part and the cross-sectional area of the piping of the cooling water circulation path are appropriately set according to the quality of the circulating water, the structure of the separation part, etc., and the flow rate of the circulating water flowing through the separation part and the cooling water circulation path Is done.

Invention of Claim 3 of this invention is a cooling tower system of Claim 1 or 2, Comprising: The bypass pipe connected to the inflow path which makes circulating water flow in into the said cooling tower among the said cooling water circulation paths is provided. The active water device has a configuration arranged in the bypass pipe.
With this configuration, in addition to the operation obtained in the first or second aspect, the following operation can be obtained.
(1) Since the active water device is disposed in the bypass pipe communicated with the inflow path, the flow rate for properly flowing the ceramic particles of the active water apparatus is obtained by adjusting the flow rates of the inflow path and the bypass pipe. The circulating water generated can be made to flow through the bypass pipe to bring out the maximum active water effect of the active water device.
(2) Since the active water device is disposed in the bypass pipe connected to the inflow passage, the circulating water immediately after passing through the active water device can be circulated through the filler disposed in the cooling tower. Scale can be made difficult to adhere.

  Here, it is desirable to provide a flow rate adjusting valve for adjusting the flow rate in the bypass pipe or the inflow path. This is because by operating the flow rate adjusting valve, circulating water that can obtain a flow rate for properly flowing the ceramic particles of the active water device can be made to flow through the bypass pipe.

Invention of Claim 4 of this invention is a cooling tower system in any one of Claim 1 thru | or 3, Comprising: The said isolation | separation part has the structure formed in the inner bottom part of the said cooling tower. Yes.
According to this configuration, in addition to the action obtained in any one of claims 1 to 3, the following action is obtained.
(1) Since the circulating water stays at the inner bottom of the cooling tower and becomes slower than the flow rate of the cooling water circulation path, the precipitate can be easily settled and deposited, and the filler disposed in the cooling tower The attached deposit can be easily dropped by vibration, wind pressure, etc., and deposited on the inner bottom of the cooling tower.

Here, an inclination and a level | step difference can be provided in the baseplate of the inner bottom part of a cooling tower. For example, it can be formed in a downward convex conical shape. As a result, the precipitates gather in a lower part due to gravity, and therefore it is easy to discharge the precipitates out of the system. Further, by depositing a water-repellent coating such as a fluorine-based resin on the bottom plate of the inner bottom portion or manufacturing the bottom plate with a water-repellent material, it is possible to make it difficult to adhere the deposited precipitate to the inner bottom portion.
Further, fine irregularities can be formed on the bottom plate of the inner bottom portion. As a result, the water contact area increases, and water comes into contact with the convex portions, so that the precipitates are easily precipitated, and the depositing effect of the precipitates can be enhanced.
Moreover, a stirring device can be provided in the lower part of a cooling tower, and the stored water stored in the inner bottom part can be stirred at a flow rate that does not dissolve precipitates. Thereby, precipitates can be collected in the central part of the stirred stored water, and can be separated efficiently.

As described above, according to the cooling tower system of the present invention, the following advantageous effects can be obtained.
According to the invention of claim 1,
(1) Cooling minerals such as calcium, magnesium and silica, which are dissolved components of circulating water, by introducing circulating water into the active water device and repeating friction and collision with each other while flowing ceramic particles in the circulating water. Precipitated in microcrystalline form in the water circulation path, precipitates floating in the circulating water in a colloidal state can be separated from the circulating water, maintaining the conductivity of the circulating water below a certain value and concentrating minerals Therefore, it is possible to simplify the system of the cooling water circulation path in which the cooling tower is disposed without the need for complicated operations such as monitoring the conductivity of the circulating water and performing regular blow (drainage). At the same time, it is possible to provide a cooling tower system that is remarkably excellent in water-saving effect and that can also be expected to have a warming countermeasure effect by fixing CO ₂ .

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) Cooling tower that can make the flow rate of circulating water flowing through the separation section slower than the flow rate of circulating water flowing through the cooling water circulation path, and precipitates and deposits by gravity, and can be separated from the circulating water. Can provide a system.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2,
(1) By adjusting the flow rates of the inflow passage and the bypass pipe, circulating water that can obtain a flow rate for properly flowing the ceramic particles of the active water apparatus is caused to flow through the bypass pipe, thereby maximizing the active water effect of the active water apparatus. A cooling tower system can be provided.
(2) It is possible to provide a cooling tower system in which the circulating water immediately after passing through the active water device can be circulated through the filler disposed in the cooling tower, and the scale can hardly be attached to the filler.

According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3,
(1) Since the circulating water stays at the inner bottom of the cooling tower and becomes slower than the flow rate of the cooling water circulation path, the precipitate can be easily settled and deposited, and the filler disposed in the cooling tower It is possible to provide a cooling tower system in which deposited deposits can be easily dropped by vibration, wind pressure, or the like and deposited on the inner bottom of the cooling tower.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a configuration diagram of a cooling tower system according to Embodiment 1 of the present invention.
In the figure, 1 is a cooling tower system in Embodiment 1 of the present invention, 2 is a cooling water circulation path for circulating cooling water, 3 is an open type cooling tower disposed in the cooling water circulation path 2, and 4 is an inner bottom portion of the cooling tower 3 The separation section 5 formed in the horizontal direction and having a horizontal cross-sectional area wider than the pipe cross-sectional area of the cooling water circulation path 2, 5 is disposed on the inner periphery of the cooling tower 3, and is in contact with the taken-in outside air, 6 has a cooling tower at one end 3 is a supplementary water supply path for supplying supplementary water to compensate for the shortage of circulating water due to evaporation of part of the circulating water, and 7 is a supplementary water supply filled with an antibacterial agent that generates copper ions, silver ions, etc. An antibacterial agent filling portion disposed in the path 6, 8 is a flow rate adjusting valve disposed in the makeup water supply path 6 to adjust the flow rate of makeup water, and 9 is a cooling water circulation that causes the circulating water to flow out from the cooling tower 3. 2, a part of the outflow passage 10, 10 is a flow rate adjusting valve that is disposed in the outflow passage 9 and adjusts the flow rate of the circulating water, 11 is a pump that is disposed in the outflow passage 9 and circulates the circulating water in the cooling water circulation passage 2, Reference numeral 12 denotes a heat exchanger such as a refrigerator or a compressor to which one end of the outflow passage 9 is connected. Reference numeral 13 denotes one end connected to the heat exchanger 12 and the other end connected to the upper side of the cooling tower 3 to supply circulating water to the cooling tower 3. An inflow path for flowing into the filler 5, 14 is a flow rate adjustment valve arranged in the inflow path 13 to adjust the flow rate of circulating water, and 15 has one end communicating with the inflow path 13 upstream of the flow rate adjustment valve 14 and the other end. A bypass pipe connected to the inflow passage 13 on the downstream side of the flow regulating valve 14, 16 is a strainer disposed in the bypass pipe 15 to remove impurities in the circulating water, and 17 is arranged on the bypass pipe 15 downstream of the strainer 16. Adjusting the flow rate of circulating water Flow control valve for, 18 is a water activation device disposed in the bypass pipe 15 on the downstream side of the flow control valve 17. The active water device 18 inserts ceramic particles into a cylindrical container, and passes circulating water from the lower part toward the upper part to generate a water flow in the container, and the water flow causes the ceramic particles to flow, collide, and interact with each other. Circulating water can be modified by friction.

About the cooling tower system in Embodiment 1 of this invention comprised as mentioned above, the usage method is demonstrated below.
The flow rate adjusting valves 10, 14, and 17 are opened to drive the pump 11 to circulate the circulating water in the cooling water circulation path 2. Next, the flow rate of the circulating water passing through the active water device 18 is adjusted to 1 to 15 cm / sec by adjusting the flow rate of the circulating water flowing through the bypass pipe 15 by adjusting the opening of the flow rate adjusting valve 14 or 17. Adjust to. This is because the ceramic particles are caused to flow in the active water device 18 and collide with each other to cause mutual friction.
Since the remaining circulating water is cooled by using the heat of vaporization in which part of the circulating water evaporates in the cooling tower 3, the shortage of circulating water due to evaporation is supplied from the makeup water supply path 6 to the cooling tower 3.
Thereby, the cooling water (circulation water) used with the heat exchanger 12 can be cooled with the cooling tower 3, and a cooling water can be circulated efficiently.

As described above, since the cooling tower system according to Embodiment 1 of the present invention is configured, the following operation can be obtained.
(1) By introducing circulating water into the active water device 18 and repeating friction and collision with each other while flowing the ceramic particles in the circulating water, mineral components such as calcium, magnesium and silica which are dissolved components of the circulating water can be obtained. It precipitates in the form of microcrystals in the cooling water circulation path 2 and becomes a colloidal state and floats in the circulating water. This is because the circulating water is cationized by the active water device 18, so that CO _{2 in} the atmosphere (as a whole is nonpolar but the electron density is biased toward oxygen) and oxygen are easily absorbed, and the mineral dissolved in the circulating water. It is presumed that the portion was precipitated as crystals of CaCO ₃ , SiO ₂ , MgCO _3, etc. Moreover, since circulating water is cooled with the cooling tower 3, it is guessed that a mineral part will precipitate easily. Further, since the precipitated crystals are bonded with cationized water molecules, the crystals charged to the same charge exist in a colloidal state without growing together and the cooling water circulation path 2 is also positively charged. Therefore, it is presumed that the crystals do not adhere to the piping wall of the cooling water circulation path 2, the filler 5 of the cooling tower 3, the inner wall of the heat exchanger 12, etc., and the scale does not grow.
(2) Since the separation unit 4 is provided, the precipitate floating in the circulating water in a colloidal state can be separated from the circulating water. By separating minerals such as calcium, magnesium and silica dissolved in the circulating water from the circulating water, the conductivity of the circulating water can be maintained below a certain value, and the mineral is prevented from being concentrated. As a result, it is not necessary to monitor the conductivity of the circulating water and perform periodic blowing (drainage), and the system of the cooling water circulation path 2 provided with the cooling tower 3 can be simplified. Moreover, since there is no need to replenish the shortage of circulating water due to blow (drainage), the water-saving effect is remarkably excellent. Furthermore, since CO ₂ absorbed in the circulating water precipitates a mineral component dissolved in the circulating water and is fixed to the precipitate, a warming countermeasure effect can be expected.
(3) Since the separation section 4 formed at the inner bottom of the cooling tower 3 has a horizontal cross-sectional area wider than the piping cross-section of the cooling water circulation path 2, the flow rate of circulating water flowing through the separation section 4 is It can be made slower than the flow rate of the circulating water flowing through the cooling water circulation path 2. For this reason, precipitates can be precipitated and deposited by gravity, and can be separated from circulating water. Furthermore, the deposits attached to the filler 5 disposed in the cooling tower 3 can be easily dropped by vibration, wind pressure, or the like, and can be deposited on the separation portion 4 formed on the inner bottom portion of the cooling tower 3.
(4) Since the active water device 18 is disposed in the bypass pipe 15 communicated with the inflow path 13, the ceramic particles of the active water apparatus 18 are appropriately flowed by adjusting the flow rates of the inflow path 13 and the bypass pipe 15. Circulating water that provides a flow rate for causing the water to flow is allowed to flow through the bypass pipe 15, and the maximum water activation effect of the water activation device 18 can be extracted.
(5) Since the strainer 16 is disposed in the bypass pipe 15 on the upstream side of the active water device 18, the active water device 18 can be prevented from being clogged with impurities in the circulating water.
(6) Since the antibacterial agent filling portion 7 is disposed in the makeup water supply path 6, it is possible to prevent or suppress the occurrence of slime, algae, and the like in the cooling water circulation path 2.

Here, although the case where the cooling tower 3 is an open type has been described in the present embodiment, the same operation can be obtained also when a hermetic cooling tower is used.
Moreover, although the case where the separation part 4 was formed in the inner bottom part of the cooling tower 3 was described, for example, a pipe that is thicker than the pipe diameter of the cooling water circulation path 2 is erected in a substantially vertical direction, In some cases, a circulating water flower, a liquid cyclone, a filter, a strainer, or the like having a mesh size or a channel diameter smaller than the particle size of the precipitate is disposed at a predetermined position of the cooling water circulation path 2. In this case, the same effect can be obtained.
Moreover, although the case where the other end of the bypass pipe 15 is connected to the inflow path 13 on the downstream side of the flow rate adjusting valve 14 has been described, the other end of the bypass pipe 15 may be connected to the upper side or the bottom side of the cooling tower 3. is there. In this case, the same effect can be obtained.
Moreover, although the case where the antibacterial agent filling unit 7 is disposed in the makeup water supply path 6 has been described, the present invention is not limited thereto, and may be disposed in the cooling water circulation path 2. In this case, the same effect can be obtained.

Hereinafter, the present invention will be specifically described by way of examples. The present invention is not limited to these examples.
Example 1
The effect of the present invention was confirmed using the cooling tower system described in the first embodiment.
As the active water device 18, 2 kg of ceramic particles having a particle diameter of 3 mmφ are placed in a transparent pipe (cylindrical container) made of vinyl chloride resin having an inner diameter of 104 mm and a length of 424 mm, and stainless steel punching metal is attached to both ends of the pipe. The one with attached was used. The amount of ceramic particles charged was 30 vol% of the volume of the pipe between the punching metals.
A bypass pipe 15 was communicated with the inflow path 13 of the cooling water circulation path 2 in which the cooling tower 3 (model: SKB-60R, manufactured by Kuken Kogyo Co., Ltd.) was disposed, and an active water device 18 was disposed in the bypass pipe 15. By circulating circulating water (tap water) with a flow rate of 30 L / min through the bypass pipe 15, the circulating water was passed through the active water device 18 at a flow rate of 4 m / min (about 6.7 cm / sec). It was visually confirmed that the ceramic particles flow, collide, and rub against each other in the space (between punching metals) in the container (transparent pipe) of the active water device 18. In addition, an 18 mesh stainless steel strainer 16 was disposed upstream of the active water device 18 to prevent clogging of the active water device 18 due to contaminants in the circulating water.
Continuous operation for about 9 months from September 2006 to June of the following year under the condition that water treatment agents such as scale adhesion preventives are not injected, and that the circulating water is not blown (drained). And verified. The shortage of evaporated circulating water was appropriately supplied from the makeup water supply path 6.

As a result, at the time of inspection one month after the activation device 18 is attached, a very small amount of deposits such as salts that are thought to be generated by water droplets are attached to the ends of the filler 5 in the cooling tower 3. It was confirmed. In addition, the conductivity of the circulating water when the active water device 18 was attached was 410 mS / m, but increased to 474 mS / m. This is thought to be because the circulating water was concentrated by evaporation and scattering.
Two months after the installation of the active water device 18, the deposits adhering to the ends of the filler 5 increased, and at the same time, deposits that seemed to be scales were present in the lower pan (separating portion) in the cooling tower 3. The deposit was soft and fell like a touch when touched with a finger. The conductivity of the circulating water was 199 mS / m, which was lower than the conductivity of the circulating water when the active water device 18 was attached. In addition, deposits of deposits were not observed in the portion of the filler 5 through which the circulating water passed.
Three months after the installation of the active water device 18, there was no change except that the amount of deposits in the lower pan (separation part) of the cooling tower 3 increased. The conductivity of the circulating water was 197 mS / m.
The same tendency as the previous month was also confirmed 4 months after the installation of the water activation device 18. Moreover, the shell cover of the condenser which is the heat exchanger 12 was opened and the internal heat exchange tube was inspected, but the scale was not attached. The conductivity of the circulating water was 120 mS / m, which was nearly 80 mS / m lower than the previous month.
Nine months after the installation of the active water device 18, the shell cover of the condenser was opened again for inspection, but the scale was not adhered as in the previous case, and the scale was not adhered to the filler 5. . The conductivity of the circulating water was 200 mS / m. Moreover, the deposits in the lower pan (separating part) of the cooling tower 3 could be easily removed by pushing away with a deck brush or the like, and the amount was 3 cups in a 20 L bucket.

  As described above, according to the present embodiment, the conductivity of the circulating water is kept below a certain value while being a simple system that does not use a water treatment agent such as a scale adhesion inhibitor and does not perform regular blowing (drainage). Maintained (after two months from the installation of the active water device 18, the conductivity of the circulating water changes between 200-300 mS / m) to prevent the concentration of minerals, cooling tower, cooling water circulation path, heat exchanger, etc. It has become clear that scale can be prevented from adhering to the surface. Furthermore, since no blow (drainage) is required, it is not necessary to compensate for the shortage of circulating water due to blow (drainage).

The present invention relates to a cooling tower system in a cooling water circulation path in which a cooling tower is provided, and it is a simple system that does not use a water treatment agent such as a scale adhesion inhibitor or periodically blow (drainage), while circulating water Maintains conductivity below a certain value to prevent minerals from being concentrated, prevents scale from sticking to the cooling tower and cooling water circuit, and compensates for the shortage of circulating water due to blow (drainage). Cooling tower system that can be expected to have a warming countermeasure effect because CO ₂ absorbed in the circulating water is not necessary, and is absorbed in the circulating water. Can provide.

Configuration diagram of cooling tower system according to Embodiment 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling tower system 2 Cooling water circulation path 3 Cooling tower 4 Separation part 5 Filling material 6 Supply water supply path 7 Antibacterial agent filling part 8 Flow rate adjustment valve 9 Outflow path 10 Flow rate adjustment valve 11 Pump 12 Heat exchanger 13 Inflow path 14 Flow rate adjustment valve 15 Bypass pipe 16 Strainer 17 Flow rate adjustment valve 18 Water activation device

Claims (4)

A cooling tower system in a cooling water circulation path provided with a cooling tower,
Ceramic particles that are made to flow by the water flow of the circulating water are charged into the container and the active water device that is disposed in the cooling water circulation path and the precipitate of dissolved components of the circulating water that is disposed or formed in the cooling water circulation path are separated. A cooling tower system comprising: a separation unit;   The cooling tower system according to claim 1, wherein a cross-sectional area of the flow path of the separation portion is wider than a cross-sectional area of a pipe of the cooling water circulation path.   3. The apparatus according to claim 1, further comprising a bypass pipe communicated with an inflow path for allowing circulating water to flow into the cooling tower in the cooling water circulation path, wherein the active water device is disposed in the bypass pipe. Cooling tower system.   The cooling tower system according to any one of claims 1 to 3, wherein the separation portion is formed at an inner bottom portion of the cooling tower.

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