JP2019032099A - Chemical feeder and cooling tower facility - Google Patents

Abstract

To provide a chemical feeder which can supply an amount of a chemical agent set according to fluctuation of a load imposed on a cooling tower facility to a coolant, and to provide the cooling tower facility including the chemical feeder.SOLUTION: A chemical feeder at least includes: a container which houses a solid chemical agent disposed outside a cooling tower; and a dissolution water supply line which supplies at least a part of makeup water supplied to the cooling tower as dissolution water for dissolving the solid chemical agent. The chemical feeder is characterized in that an inflow port and an outflow port of the dissolution water are provided separating from each other at a bottom part of the container which houses the solid chemical agent or in an area around the bottom part and one end of the dissolution water supply line is connected to the inflow port.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chemical injection device for dissolving a solid chemical for water treatment and supplying it to cooling water of a cooling tower facility, and a cooling tower facility equipped with such a chemical injection device.

  Cooling tower equipment is known as equipment that circulates cooling water and supplies it to refrigerators and the like for use in air conditioning and cooling in buildings or factories. The cooling tower of the cooling tower equipment includes a fan at the top of the tower, watering means such as a watering plate and watering pipe below the fan, a filler below the watering means, and a lower part at the bottom. A water tank is arranged.

  In the cooling tower equipment equipped with such a cooling tower, the cooling water is supplied from the lower water tank of the cooling tower to the heat exchanger such as a refrigerator by a cooling water circulation pump, and then returned to the cooling tower from the heat exchanger to cool the cooling tower. Water is sprinkled from the watering means in the tower and flows down. In the flow-down process, latent heat is taken away by evaporating a part of the cooling water, and the cooling water whose temperature is lowered is returned to the lower water tank again.

  Microorganisms such as algae and bacteria may adhere to the watering means and filler of the cooling tower. Since the cooling efficiency of the cooling tower equipment may be reduced due to the adhesion of these microorganisms and the like, it is necessary to prevent the adhesion of microorganisms and the like by performing a sterilization process on the cooling water.

  Therefore, conventionally, a method of treating the cooling water in the lower water tank by sinking a solid drug dissolver used in a pool or the like in the lower water tank, or a watering plate to which cooling water is supplied only during operation of the cooling tower A method has been adopted in which a dissolver is placed on the surface of the substrate, thereby treating the cooling water before flowing down into the filler.

  For example, as a method of dissolving a solid drug such as a scale inhibitor or an anti-slime agent in water and supplying it to cooling water, Patent Document 1 discloses that a water permeable bag containing a solid drug is a water treatment drug addition pack. A technique of immersing in a cooling tower pit (lower water tank) is disclosed.

  However, the water treatment chemical addition pack has a structure in which the chemical is dissolved and discharged when cooling water enters the pack containing the solid chemical. Therefore, when such a pack is floated or settled in the cooling water of the lower aquarium to perform water treatment of the cooling tower, the dissolved chemical is cooled even when the cooling tower is not in operation without any load on the cooling tower equipment. There is a risk of continuing to be supplied into the water. Therefore, in addition to the supply of chemicals according to the fluctuation of the load on the cooling tower equipment, the chemical concentration of the cooling water will rise excessively, corrosion of the structural material such as the lower water tank constituting the cooling tower, Problems such as generation of odor from the inside of the cooling tower may occur.

  In this respect, in the method of placing the dissolver on the water spray plate, the cooling water is supplied only during the operation of the cooling tower, so that the chemical can be prevented from being dissolved and supplied when the cooling tower is not operating. . However, in general, since the watering plate is located at a height of 2 m or more from the lower part of the cooling tower, there may be a problem that it is not easy to replenish the medicine into the dissolver and check the remaining amount of the medicine.

  As a technique different from the above, for example, in Patent Document 2, a branch pipe is provided in an ascending pipe that supplies cooling water to a water spray plate, and cooling from the branch pipe is performed at a position higher than the cooling water level of the lower water tank. A technique for disposing a dissolver to which water is supplied is disclosed. With this technology, a part of the cooling water supplied to the sprinkler plate only during operation of the cooling tower is taken into the dissolver via the branch pipe to dissolve the drug in the dissolver, and the obtained drug solution Can be supplied to the lower water tank for water treatment. Further, by connecting this branch pipe to a dissolver provided outside the cooling tower, it is easy to check the remaining amount of the medicine.

  As another technique, for example, in Patent Document 3, a container for storing a solid medicine is installed outside the cooling tower, and as a water collecting section for collecting cooling water in the filler of the cooling tower. By inserting a bowl-shaped water collector into the filler, a part of the cooling water flowing down the filler can be collected, and the collected cooling water can be collected at the bottom of the container outside the cooling tower. The drug solution can be prepared by allowing cooling water to flow into the bottom of the container from the inflow section provided and bringing it into contact with the solid drug in the container. And this chemical | medical solution can be made to flow in into the lower water tank of a cooling tower through the chemical injection pipe | tube etc. from the outflow part of a container.

Japanese Patent Laid-Open No. 61-21780 Utility Model Registration No. 3147150 JP2013-210134A

  In the cooling tower facility, the amount of circulating water per unit time is constant, and when the load of the cooling tower facility fluctuates, it is generally adjusted by starting and stopping the fan at the top of the cooling tower. In such a cooling tower facility, since the cooling water supplied to the above-described dissolver and the container for storing the solid medicine is also constant, the dissolution amount of the solid medicine cannot be changed according to the load fluctuation. Specifically, when a large load is required for the cooling tower facility, for example, even if there is an increase in load due to seasonal fluctuations, the amount of chemical supplied to the cooling water is constant. As a result, the concentration of the drug component in the cooling water cannot be made sufficient, and the drug supply effect may not be sufficiently obtained. In addition, even when the load is small, the medicine supply amount is constant, so that the medicine may be consumed wastefully.

  The present invention aims to solve the conventional problems as described above, and a chemical injection device capable of supplying the cooling water with an amount of chemical according to the fluctuation of the load on the cooling tower equipment, and this It aims at providing the cooling tower installation provided with such a chemical injection device.

  That is, the chemical injection device of the present invention supplies a container for storing the solid medicine arranged outside the cooling tower and at least a part of the replenishing water replenished to the cooling tower as dissolved water for dissolving the solid medicine. A dissolved water supply line, and at the bottom or near the bottom of the container containing the solid medicine, an inlet and an outlet of the dissolved water are provided apart from each other, and the dissolved water supply One end of the line is connected to the inlet.

  The other end of the dissolved water supply line may be connected to a makeup water supply line of the cooling tower.

  The dissolved water supply line may be provided with an inflow amount adjusting valve for adjusting an inflow amount of the dissolved water to the container for storing the solid medicine.

  The container which accommodates the said solid chemical | medical agent may be arrange | positioned so that the said outflow port may become a position higher than the water surface of the cooling water of the lower water tank of the said cooling tower.

  A chemical injection line for supplying the dissolved water in which the solid chemical is dissolved to the cooling tower may be provided, and one end of the chemical injection line may be connected to the outlet.

  The medicine injection line may include an outflow amount adjusting valve for adjusting the outflow amount of the dissolved water in which the solid medicine is dissolved.

  Moreover, the cooling tower installation of this invention is equipped with any one said chemical injection apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the chemical injection apparatus which can melt | dissolve the quantity of solid chemicals according to the load fluctuation of a cooling tower equipment, and can supply it to a cooling tower, and the cooling tower equipment provided with such a chemical injection apparatus Can be provided.

It is the schematic which shows the example of the cooling tower installation provided with example A of the chemical injection apparatus of this invention. It is the schematic which expanded the area | region containing the chemical injection apparatus A of the cooling tower installation of FIG. It is the schematic which shows the example of the cooling tower installation different from FIG. 1 provided with Example B of the chemical injection apparatus of this invention. It is the schematic which shows the cooling tower installation used by the comparative example.

  Hereinafter, FIG. 1 which is a schematic diagram showing a cooling tower facility 1 including an example A of the chemical injection device of the present invention, FIG. 2 which is a schematic diagram showing an enlarged region including the chemical injection device A, and the present invention. An example of an embodiment of the present invention will be described with reference to FIG. 3 which is a schematic diagram showing a cooling tower facility 9 different from FIG. 1 provided with the example B of the chemical injection device.

<Cooling tower equipment 1>
A cooling tower facility 1 shown in FIG. 1 includes a cooling tower 2. The cooling tower 2 includes a fan 2a and a fan 2a for cooling the cooling water 3 by latent heat of evaporation by allowing air to flow into the cooling tower 2 from the outside to evaporate a part of the cooling water 3 at the top of the tower. Sprinkling pipe 2b for supplying cooling water 3 into cooling tower 2 from outside, filler 2c for cooling water 3 flowing from sprinkling pipe 2b below sprinkling pipe 2b, and lower water tank 2d for storing cooling water 3 at the bottom And an overflow pipe 2e that discharges an excessive amount of the cooling water 3 in the lower water tank 2d. The cooling tower equipment 1 is further connected to the lower water tank 2d of the cooling tower 2, and the cooling water forward pipe 4c that sends the cooling water 3 to the heat exchanger 4b by the cooling water circulation pump 4a and the heat exchanged by the heat exchanger 4b. A cooling water return pipe 4 d for sending water 3 to the watering pipe 2 b of the cooling tower 2, a makeup water supply line 5 for supplying makeup water to the cooling tower 2, and a chemical injection device A are provided.

  The makeup water supply line 5 is branched into a makeup water line 5a and a forced makeup water supply line 5c. Of these, the ball tap 5b in the cooling tower 2 is connected to the makeup water line 5a and the cooling water 3 is reduced. Sometimes makeup water can be replenished as appropriate. The forced supply water line 5c branched from the supply water supply line 5 is provided with a forced supply valve 5d, and the forced supply valve 5d is opened when the concentration rate of the cooling water 3 rises above a predetermined value. Thus, the makeup water can be forcibly replenished (blowed) to the cooling tower 2.

  One end of the dissolved water supply line 5e of the chemical injection device A that supplies makeup water to the container 6 as dissolved water is at the inlet 6a of the container 6, and the other end is forced makeup water at the forced supplement valve 5d of the forced makeup water line 5c. Connected downstream in the flow direction. With such a configuration, dissolved water is supplied to the medicine injection device A when blowing. In the present invention, the makeup water may be supplied to the dissolved water supply line connected to the container for storing the solid medicine regardless of the configuration of the piping.

  In FIG. 1, the cooling tower 2 is provided with an electric conductivity meter 7 for measuring the electric conductivity of the cooling water 3 in the lower water tank 2d. When the electric conductivity of the cooling water 3 measured by the electric conductivity meter 7 exceeds a predetermined value, the control means (not shown) opens the forcible replenishment valve 5d and replenishes the lower water tank 2d with excess water. By discharging a part of the cooling water 3 from the overflow pipe 2e to the outside of the cooling tower 2, the concentration ratio of the cooling water 3 can be maintained within a predetermined range.

  In the chemical injection device A schematically shown in FIG. 2, a container 6 for storing the solid medicine 8 disposed outside the cooling tower 2 and makeup water to be supplied to the cooling tower 2, in this example, a part thereof, And a dissolved water supply line 5e for supplying the solid medicine 8 as dissolved water for dissolving. Dissolved water inlet 6a and outlet 6c are provided at the bottom of container 6 so as to be spaced apart from each other. One end of dissolved water supply line 5e is connected to inlet 6a and one end of drug injection line 6d is connected to outlet 6a. Each is connected to the outflow port 6c. The other end of the dissolved water supply line 5e is connected to the forced replenishment water line 5c. The dissolved water supply line 5e is provided with an inflow amount adjusting valve 6b for adjusting the amount of inflow when the dissolved water flows into the container 6 together with the back pressure valve 5m provided in the forced replenishing water line 5c in this example. ing. The back pressure valve 5m may be omitted depending on conditions such as the amount of blow water, the thickness and length of the piping, the diameter of the inlet 6a and the outlet 6c, and the like.

  The dissolved water introduced into the container 6 from the inflow port 6 a comes into contact with, for example, the deposited tablet-shaped solid medicine 8 at the bottom inside the container 6. Then, a part of the lower side of the solid drug 8 is dissolved, whereby dissolved water in which the solid drug 8 is dissolved, that is, a drug solution is prepared. The chemical solution is supplied to the cooling water 3 in the lower water tank 2d of the cooling tower 2 through a chemical injection line 6d having one end connected to the outlet 6c and the other end being an open end in the cooling tower 2. The Note that the chemical injection line 6d can be omitted, for example, when the chemical solution can be supplied directly from the outlet 6c to the cooling water 3.

  In this medicine injection device A, the supply amount of the chemical solution to the cooling water 3 can be adjusted by adjusting the inflow amount of the dissolved water to the container 6 by the inflow amount adjustment valve 6b. The makeup water is supplied only when the cooling tower 2 is operating and according to the load of the cooling tower equipment. Therefore, an amount of the drug solution corresponding to the load of the cooling tower equipment is supplied to the cooling water 3, and when the cooling tower 2 is not in operation, there is no supply of dissolved water to the container 6. The supply to the tower 2 can be prevented.

  A removable cap 6e can be provided on the upper part of the drug dissolving container 6. By removing the cap 6e, the upper portion of the container 6 can be opened. Therefore, the solid agent 8 such as a slime control agent, a scale inhibitor, a corrosion inhibitor, or a mixture thereof can be accommodated in the container 6. And after accommodating the solid chemical | medical agent 8, the upper part of the container 6 can be closed by mounting | wearing with the cap 6e. The remaining amount of the solid medicine inside the container 6 can be easily confirmed by, for example, removing the cap 6e and visually checking the inside of the container 6.

  Here, for example, when there is a concern that the drug solution overflows from the upper part of the container 6 by clogging the outflow port 6c or the drug injection line 6d with the solid drug 8 that is powdered in the process of dissolution in dissolved water. In order to prevent such overflow, it is preferable that the cap 6e can be sealed. The solid drug 8 in the container 6 is dissolved and dissolved in dissolved water, but when the container 6 can be sealed, the concentration of the drug solution to be prepared increases due to an increase in the level of the dissolved water in the container 6. May occur. For this reason, it is preferable to take measures such as attaching a check valve or the like to the upper part of the lid of the container 6 so that air having the same volume as the volume of the solid medicine 8 can be taken from the outside of the container 6.

  In the cooling tower facility 1, since the container 6 is disposed outside the cooling tower 2, it is easy to check the remaining amount of the solid medicine 8 in the container 6 and replenish the solid medicine 8. In addition, it is preferable to make the container 6 itself transparent so that the inside of the container 6 can be visually recognized, or to provide a transparent window part in a part of the container 6. Thereby, confirmation of the remaining amount of the solid medicine 8 becomes easier.

  Further, in the cooling tower facility 1, the container 6 is disposed so that the outlet 6c is higher than the water surface of the cooling water 3 in the lower water tank 2d. With such an arrangement, the drug solution can be supplied without using power such as a pump to supply the drug solution. Therefore, a pump or the like is not necessary, and the apparatus cost can be suppressed. Furthermore, since the running cost for supplying the drug solution can be substantially only the cost of the drug itself, the management cost of the cooling water can be suppressed.

  Furthermore, in the cooling tower facility 1, the chemical injection line 6d can be formed only by a horizontal part and a part directed downward. In addition to this configuration, by providing the outlet 6c at the bottom of the container 6, the drug solution staying in the container 6 when the dissolved water is not supplied is substantially eliminated, so that the drug solution is not expected in the container 6. A high concentration can be prevented, and the concentration of the drug in the cooling water 3 can be stabilized.

  In the above example, the inflow rate adjusting valve 6b is installed in the dissolved water supply line 5e, but the present invention is not limited to this. For example, an outflow amount adjusting valve can be installed on the downstream side of the container 6, that is, on the outflow port 6c or the drug injection line 6d. By adjusting the outflow amount adjusting valve, it is possible to control the coolant level to rise to a predetermined height in the container 6 when the drug is dissolved. By providing the inflow amount adjustment valve 6b and the outflow amount adjustment valve, for example, when the concentration of the drug in the cooling water is increased in accordance with seasonal changes, a high concentration drug solution can be prepared as necessary. Moreover, both the inflow amount adjusting valve 6b and the outflow amount adjusting valve can be provided. This makes it easier to adjust the concentration of the drug solution prepared in the container 6 and the concentration of the drug in the cooling water.

  In the cooling tower facility 1, only when the makeup water is supplied to the cooling tower 2, the solid medicine 8 can be dissolved and the medicine solution can be supplied, and the supply amount of the medicine is linked to the amount of makeup water in the cooling tower. The chemical concentration in the cooling water 3 can be controlled to be a concentration corresponding to the load fluctuation of the cooling tower facility 1. And the trouble generation | occurrence | production of the corrosion of the structural material of the cooling tower equipment 1, an odor, etc. by excessive addition of a chemical | medical agent can be prevented.

  Moreover, since the cooling water (circulated water) is usually concentrated, the concentration of scale components such as calcium compounds and silica is high. Therefore, in the methods described in Patent Document 2 and Patent Document 3, the surface of the solid drug is covered with the scale, which may hinder the dissolution of the solid drug, and there is a possibility that the stable drug cannot be dissolved or supplied. On the other hand, in the present invention, since replenishing water having a low salt concentration is used for dissolving the solid medicine 8, there is no such fear.

  In the present invention, the type of makeup water (including forced makeup water) is not particularly limited, and raw water such as tap water, well water, ground water, and industrial water can be used. Moreover, the raw | natural water which processed these raw | natural water with an ion exchange resin etc., and was made into soft water or demineralized water can also be used as supplementary water.

<Cooling tower equipment 9>
The cooling tower facility 1 is an example in which the chemical injection device A is connected to the forced makeup water line 5c branched from the makeup water supply line 5. In this cooling tower facility 1, the chemical solution is supplied to the cooling water 3 at the time of blowing. Therefore, the medicine component just supplied to the cooling water 3 may be discharged from the overflow pipe 2e, and the medicine injection effect may not be sufficiently obtained.

  Here, as in the cooling tower facility 9 schematically shown in FIG. 3, the dissolved water supply line 5f of the medicine pouring device B is connected to the water outlet of the ball tap 5b, so that no chemical is supplied during blow by forced replenishment. In addition, the chemical solution can be supplied only when the makeup water is supplied when the level of the cooling water 3 in the lower water tank 2d is lowered. In this example, the container 6 installed outside the cooling tower 2 The dissolved water supply line 5f connected to the inflow port is connected to the water outlet of the ball tap 5b.

  The other end of the chemical injection line 6d is an open end in the cooling tower 2, and the chemical solution prepared in the container 6 is supplied to the cooling water 3 in the lower water tank 2d of the cooling tower 2. With such a configuration, similarly to the cooling tower facility 1, the cooling tower facility 9 has a large load, that is, when the amount of evaporation of the cooling water 3 is large, or the load is small, that is, the evaporation of the cooling water 3. Even when the amount is small, it is possible to inject medicine according to each load.

  In this example, the entire amount of make-up water supplied from the ball tap 5b is supplied to the chemical injection device B as dissolved water. However, a branch is provided in the dissolved water supply line 5f to directly supply a part of the make-up water to the lower part of the cooling tower 2. You may enable it to supply to the water tank 2d. Note that, among members, equipment, and the like constituting the cooling tower facility 9 described in FIG. 3, those having the same reference numerals as the cooling tower equipment 1 in FIG. 1 have the same functions as the members and equipment constituting the cooling tower equipment 1. Since it is a thing, description is abbreviate | omitted.

  Further, if necessary, the replenishment supplied from the ball tap 5b by joining the forced replenishment water flow direction of the forced replenishment water line 5c of the cooling tower facility 9 and the downstream portion from the forced replenishment valve 5d to the dissolved water supply line 5f. Both water and forced replenishment water can be supplied to the chemical injection device B as dissolved water.

  As described above, according to the chemical injection device of the present embodiment, at least a part of the container for storing the solid medicine arranged outside the cooling tower and the replenishing water to be supplied to the cooling tower, A dissolved water supply line that supplies at least a dissolved water supply line that dissolves the drug, and an inlet and an outlet of the dissolved water are provided apart from each other at or near the bottom of the container that stores the solid drug. The one end of the dissolved water supply line is connected to the inflow port, so that a stable chemical solution can be obtained, and a chemical injection amount corresponding to the load of the cooling tower is obtained. In addition, it is possible to control the remaining amount of the solid medicine and to easily replenish it.

  Of the solid medicines stacked and accommodated in the container, only the solid medicines up to a desired height determined by the attachment positions of the inlet and outlet of the container can come into contact with the dissolved water. Dissolution of the solid drug prevents the formation of an unexpectedly high concentration drug solution and prevents the solid drug in the container from being lost in an unexpected short period of time. Can be maintained stably. Further, when the amount of evaporation of the cooling water is large, that is, when the load on the cooling tower equipment is high, the amount of makeup water increases, resulting in an increase in the amount of dissolved water supplied, and a large amount of chemicals are supplied to the cooling tower. It becomes possible.

  Furthermore, since the inflow port and the outflow port are provided at positions separated from each other, the solid drug and the dissolved water can be satisfactorily brought into contact with each other, thereby contributing to stable maintenance of the drug concentration in the cooling water. be able to.

  In addition, without using cooling water for dissolving the solid drug, it is possible to contact only solid water with a good quality water, which contains less hardness components such as calcium and impurities such as silica than cooling water. it can. Therefore, stable solubility can be obtained, and clogging at the outflow port or the chemical injection line due to contamination of dust etc. or scale can be prevented. And since the replenishment water is not supplied to this container at the time of non-operation of a cooling tower installation, even if it is a case where a cooling tower installation is stopped for a long period of time, the unnecessary melt | dissolution and supply of a chemical | medical agent can be prevented.

  And the adjustment of the supply amount of the chemical solution into the cooling tower is provided with an inflow amount adjustment valve for adjusting the supply amount of the makeup water into the container and an outflow amount adjustment valve for adjusting the outflow amount of the chemical solution. Can be easily performed.

  In addition, since the container that contains the solid drug is installed so that the outlet is positioned higher than the water level of the cooling water in the cooling tower, it is possible to supply the drug solution without using power such as a pump. Thus, the cost of the apparatus can be reduced.

  Furthermore, the cooling tower equipment of the present invention can supply a chemical solution according to the load of the cooling tower equipment by including the above-described chemical injection device. Moreover, the fluctuation | variation of the chemical | medical agent density | concentration in cooling water can be suppressed, and it becomes possible to maintain the effect by a chemical | medical agent stably for a long period of time.

  Although the present invention has been described with reference to the preferred embodiment, the chemical injection device and the cooling tower facility of the present invention are not limited to the configuration of the above embodiment.

  A person skilled in the art can appropriately modify the chemical injection device and the cooling tower facility of the present invention in accordance with conventionally known knowledge. Such modifications are still included in the scope of the present invention as long as the chemical injection device and the cooling tower facility of the present invention are provided.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.

As an example, the cooling tower facility 1 shown in FIG. 1 (refrigeration capacity 500 RT, retained water amount 10 m ³ ), and as a comparative example, as shown in FIG. The same cooling tower equipment 1 ′ (refrigeration capacity 500RT, retained water amount 10m ³ ) is used except for using the chemical injection device A ′ to which the cooling water 3 circulating through the cooling tower 2 and the heat exchanger 4b is supplied. These cooling tower facilities 1, 1 ′ were operated for air conditioning with the same. In FIG. 4, the cooling water 3 flows into the container 6 ′ through the cooling water introduction pipe 4d2 branched from the branching part 4d1 of the cooling water return pipe after passing through the heat exchanger 4b. And the chemical | medical solution after chemical | medical solution melt | dissolution is supplied to the cooling tower 2 from container 6 'via chemical injection line 6d'.

  In any of the examples and comparative examples, a cooling water detergent (calcium hypochlorite) is used as the solid drug, and the free residual chlorine concentration of the cooling water is 0.1 to 0.5 mg / L (liter). Then, the supply amount of the chemical solution to the cooling water in the cooling tower 2 was controlled continuously for one month. During operation of the cooling tower facilities 1 and 1 ', the chemical solution from the container is collected from the chemical injection lines 6d and 6d' at regular times every day, and the cooling water is collected from the cooling water return pipe 4d. The free residual chlorine concentration of the solution and cooling water was measured.

  As a result, the variation in the concentration of free residual chlorine in the drug solution was 50 ± 5 mg / L in the drug injection device of the example, but 40 ± 30 mg / L in the drug injection device of the comparative example, compared to the example. The concentration variation was large. On the other hand, the fluctuation of the free residual chlorine concentration in the cooling water was 0.2 ± 0.1 mg / L in the cooling tower equipment of the example, but 0.5 ± 0.5 mg / L in the cooling tower equipment of the comparative example. Compared with the example, the range of variation in density was large. From these results, in the case of the chemical injection device and cooling tower facility of the example, compared to the chemical injection device and cooling tower facility of the comparative example, a chemical solution having a stable concentration can be obtained, and stable water treatment can be achieved. I found it possible.

A, A ', B Chemical injection device 1, 1', 9 Cooling tower equipment 2 Cooling tower 2a Fan 2b Sprinkling pipe 2c Filler 2d Lower water tank 2e Overflow pipe 3 Cooling water 4a Cooling water circulation pump 4b Heat exchanger 4c Cooling water going Piping 4d Cooling water return piping 4d1 Branching portion 4d2 Cooling water introduction pipe 5 Supplementary water supply line 5a Supplementary water line 5b Ball tap 5c Forced supplementary water line 5d Forced supplementary valve 5e, 5f Dissolved water supply line 5m Back pressure valve 6, 6 'Container 6a Inlet 6b, 6b 'Inflow control valve 6c Outlet 6d, 6d' Infusion line 6e Cap 7 Electric conductivity meter 8 Solid medicine

Claims (7)

A container for storing a solid medicine arranged outside the cooling tower;
A dissolved water supply line for supplying at least a part of makeup water to be supplied to the cooling tower as dissolved water for dissolving the solid medicine;
Comprising at least
At the bottom or near the bottom of the container containing the solid medicine, an inlet and an outlet of the dissolved water are provided apart from each other,
One end of the dissolved water supply line is connected to the inflow port.   2. The chemical injection device according to claim 1, wherein the other end of the dissolved water supply line is connected to a makeup water supply line of the cooling tower.   The chemical injection device according to claim 1 or 2, wherein the dissolved water supply line is provided with an inflow amount adjusting valve for adjusting an inflow amount of the dissolved water into a container for storing the solid medicine. .   The container which accommodates the said solid chemical | medical agent is arrange | positioned so that the said outflow port may become a position higher than the water surface of the cooling water of the lower tank of the said cooling tower, The any one of Claims 1-3 characterized by the above-mentioned. The chemical injection device according to item 1.   5. A medicine injection line for supplying the dissolved water in which the solid medicine is dissolved to the cooling tower is provided, and one end of the medicine injection line is connected to the outlet. The chemical injection device according to any one of the above.   The medicine injection device according to claim 5, wherein the medicine injection line includes an outflow amount adjustment valve for adjusting an outflow amount of the dissolved water in which the solid medicine is dissolved.   A cooling tower facility comprising the chemical injection device according to any one of claims 1 to 6.

Images