JP7019340B2 - Grout equipment and cooling tower equipment - Google Patents

Description

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

Cooling tower equipment is known as equipment that circulates cooling water and supplies it to a refrigerator or the like, which is used for air conditioning or cooling in a building or factory. Inside, the cooling tower of the cooling tower equipment is equipped with a fan at the top of the tower, a watering means such as a watering plate or a watering pipe below the fan, a filler below the watering means, and a lower part at the bottom. A water tank is arranged.

In a cooling tower facility equipped with such a cooling tower, cooling water is supplied from the lower water tank of the cooling tower to a heat exchanger such as a refrigerator by a cooling water circulation pump or the like, and then returned from the heat exchanger to the cooling tower for cooling. Water is sprinkled on the filler from the watering means in the tower and flows down. In the process of this flow, latent heat is taken away by the evaporation of a part of the cooling water, and the cooling water whose water temperature has dropped is returned to the lower water tank again.

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

Therefore, conventionally, a method of submerging a solid chemical lysing device or the like used in a pool or the like in a lower water tank to treat the cooling water in the lower water tank, or a sprinkler plate in which cooling water is supplied only while the cooling tower is in operation. A method was adopted in which a solubilizer was placed on top of the smelter to treat the cooling water before it flowed into the filler.

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

However, the pack for adding a water treatment agent has a structure in which the cooling water enters the pack containing the solid agent to dissolve the agent and discharge the agent. Therefore, when such a pack is suspended or settled in the cooling water of the lower water tank to treat the water in the cooling tower, the chemicals dissolved even when the cooling tower is not in operation, which has no load on the cooling tower equipment, are cooled. There is a risk that it will continue to be supplied into the water. Therefore, the chemicals cannot be supplied according to the fluctuation of the load on the cooling tower equipment, and the chemical concentration of the cooling water rises excessively, which causes corrosion of structural materials such as the lower water tank constituting the cooling tower and corrosion. Problems such as the generation of odor from inside the cooling tower may occur.

In this respect, in the method of mounting the dissolver on the sprinkler plate, since the cooling water is supplied only during the operation of the cooling tower, it is possible to prevent the chemicals from being dissolved and supplied when the cooling tower is not in operation. .. However, in general, since the sprinkler 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 drug to the dissolver and check the remaining amount of the drug.

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

Further, as yet another technique, for example, in Patent Document 3, a container for accommodating a solid drug is installed outside the cooling tower, and as a water collecting unit for collecting the cooling water in the filler of the cooling tower. By inserting a gutter-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 applied to the bottom of the container outside the cooling tower. A drug solution can be prepared by flowing cooling water from the provided inflow section to the bottom of the container and bringing it into contact with the solid drug in the container. Then, this drug solution can be flowed from the outflow portion of the container into the lower water tank of the cooling tower via the drug injection pipe or the like.

Japanese Unexamined Patent Publication No. 62-1780 Utility Model Registration No. 3147150 Japanese Unexamined Patent Publication No. 2013-210134

In the cooling tower equipment, the amount of circulating water per unit time of the cooling water is constant, and when the load of the cooling tower equipment fluctuates, it is generally adjusted by starting and stopping the fan at the top of the cooling tower. In such a cooling tower facility, the cooling water supplied to the above-mentioned solubilizer and the container for accommodating the solid drug is also constant, so that the amount of the solid drug dissolved cannot be changed according to the load fluctuation. Specifically, when a large load is required for the cooling tower equipment, for example, even if the load increases due to seasonal fluctuation, the supply amount of the chemical 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 effect of drug supply may not be sufficiently obtained. Further, even when the load is small, the amount of the drug supplied is constant, so that the drug may be wasted.

An object of the present invention is to solve the above-mentioned conventional problems, a chemical injection device capable of supplying an amount of chemicals to cooling water according to fluctuations in the load on the cooling tower equipment, and a chemical injection device thereof. It is an object of the present invention to provide a cooling tower facility equipped with such a chemical injection device.

That is, the chemical injection device of the present invention includes a container for accommodating a solid drug arranged outside the cooling tower, and a forced make-up water line provided with a forced make-up valve for forcibly supplying forced make-up water to the cooling tower. , The dissolved water that is connected to the branch portion of the forced make-up water line provided downstream of the forced make-up valve in the flow direction of the forced make- up water and dissolves at least a part of the forced make-up water. A dissolved water supply line for supplying the solid drug to the container is provided at least, and the bottom of the container for accommodating the solid drug is provided with an inlet and an outlet for the dissolved water separated from each other. One end of the water supply line is connected to the inlet, and the outlet is connected to a pipe for supplying the drug solution prepared in the container to the cooling water of the cooling tower, and the dissolution. The water supply line is provided with an inflow amount adjusting valve for adjusting the inflow amount of the dissolved water into the container, and the solid drug is accommodated in the forced make-up water line downstream of the branch portion in the flow direction. It is characterized in that a back pressure valve for adjusting the inflow amount of the dissolved water into the container together with the inflow amount adjusting valve is provided .

The container for accommodating the solid drug may be arranged so that the outlet is located at a position higher than the water surface of the cooling water in the lower water tank of the cooling tower.

Further, the cooling tower equipment of the present invention is characterized by including any one of the above-mentioned chemical injection devices.

According to the present invention, a chemical injection device capable of dissolving an amount of solid chemicals corresponding to a load fluctuation of the cooling tower equipment and supplying it to the cooling tower, and a cooling tower equipment provided with such a chemical injection device. Can be provided.

It is a schematic diagram which shows the example of the cooling tower equipment provided with the example A of the medicine injecting apparatus of this invention. It is a schematic diagram which expanded the area including the medicine injecting apparatus A of the cooling tower equipment of FIG. It is a schematic diagram which shows the example of the cooling tower equipment different from FIG. 1 provided with the example B of the grout apparatus of this invention. It is a schematic diagram which shows the cooling tower equipment used in the comparative example.

Hereinafter, FIG. 1 is a schematic view showing a cooling tower facility 1 provided with an example A of the drug injection device A of the present invention, FIG. 2 is an enlarged schematic view of an area including the drug 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 view showing a cooling tower facility 9, which is different from FIG. 1 provided with an example B of a chemical injection device.

<Cooling tower equipment 1>
The cooling tower equipment 1 shown in FIG. 1 includes a cooling tower 2. Inside, the cooling tower 2 has a fan 2a and a fan 2a that allow air to flow into the cooling tower 2 from the outside to evaporate a part of the cooling water 3 and cool the cooling water 3 by the latent heat of evaporation. A sprinkler pipe 2b that supplies the cooling water 3 into the cooling tower 2 from the outside from the outside, a filler 2c in which the cooling water 3 from the sprinkler pipe 2b flows down below the sprinkler pipe 2b, and a lower water tank 2d that stores the cooling water 3 at the bottom. , And an overflow pipe 2e for discharging an excessive amount of 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 3 is sent to the heat exchanger 4b by the cooling water circulation pump 4a. It is provided with a cooling water return pipe 4d for sending water 3 to a sprinkling pipe 2b of a cooling tower 2, a make-up water supply line 5 for supplying make-up water to the cooling tower 2, and a chemical injection device A.

The make-up water supply line 5 is branched into a make-up water line 5a and a forced make-up water supply line 5c, of which the ball tap 5b in the cooling tower 2 is connected to the make-up water line 5a, and the cooling water 3 is reduced. Sometimes make-up water can be replenished as appropriate. The forced replenishment water line 5c branched from the make-up water supply line 5 is provided with a forced replenishment valve 5d, and the forced replenishment valve 5d is opened when the concentration ratio of the cooling water 3 rises above a predetermined value. Then, the make-up 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 the make-up water to the container 6 as the dissolved water is to the inflow port 6a of the container 6, and the other end is the forced make-up water of the forced make-up valve 5d of the forced make-up water line 5c. It is connected downstream in the flow direction. With such a configuration, the dissolved water is supplied to the chemical injection device A at the time of blowing. In the present invention, the make-up water may be supplied to the dissolved water supply line connected to the container for accommodating the solid drug, regardless of the configuration of the pipe.

In FIG. 1, an electric conductivity meter 7 for measuring the electric conductivity of the cooling water 3 of the lower water tank 2d is installed in the cooling tower 2. When the electric conductivity of the cooling water 3 measured by the electric conductivity meter 7 becomes a predetermined value or more, the control means (not shown) opens the forced replenishment valve 5d to replenish the replenishment water to the lower water tank 2d, resulting in an excess. 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 accommodating the solid drug 8 arranged outside the cooling tower 2 and a part of the make-up water replenished to the cooling tower 2 are used in this example. It is provided with a dissolved water supply line 5e, which supplies the solid drug 8 as dissolved water. The bottom of the container 6 is provided with an inlet 6a and an outlet 6c of dissolved water separated from each other, and one end of the dissolved water supply line 5e is provided at the inlet 6a and one end of the chemical injection line 6d. It is connected to each of the outlets 6c. Further, the other end of the dissolved water supply line 5e is connected to the forced make-up water line 5c. The dissolved water supply line 5e is provided with an inflow amount adjusting valve 6b for adjusting the inflow amount when the dissolved water flows into the container 6 together with the back pressure valve 5m provided in the forced make-up 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 pipe, and the diameters of the inflow port 6a and the outflow port 6c.

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

In this chemical injection device A, the supply amount of the drug solution to the cooling water 3 can be adjusted by adjusting the inflow amount of the dissolved water into the container 6 by the inflow amount adjusting valve 6b. Further, the make-up water is supplied only when the cooling tower 2 is in operation and according to the load of the cooling tower equipment. Therefore, an amount of the chemical solution corresponding to the load of the cooling tower equipment is supplied to the cooling water 3, and since the dissolved water is not supplied to the container 6 when the cooling tower 2 is not in operation, the excess amount of the chemical solution is cooled. It is possible to prevent the supply to the tower 2.

A removable cap 6e can be provided on the upper portion of the drug dissolving container 6. By removing the cap 6e, the upper part of the container 6 can be opened. Therefore, a solid agent 8 such as a slime control agent, a scale inhibitor, a corrosion inhibitor, or a mixture thereof can be stored in the container 6. Then, after accommodating the solid drug 8, the upper part of the container 6 can be closed by attaching the cap 6e. The remaining amount of the solid drug inside the container 6 can be easily confirmed by, for example, removing the cap 6e and visually observing the inside of the container 6.

Here, for example, when there is a concern that the solid drug 8 powdered in the process of dissolution in dissolved water may overflow the drug solution from the upper part of the container 6 by clogging the outlet 6c or the drug injection line 6d. 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 by the dissolved water to reduce the volume, but when the container 6 can be sealed, the concentration of the prepared drug solution increases due to the increase in the water level of the dissolved water inside the container 6. May occur. Therefore, it is preferable to take measures such as attaching a check valve or the like to the upper part of the lid or the like of the container 6 so that the same volume of air as the volume reduction of the solid drug 8 can be taken in from the outside of the container 6.

In the cooling tower equipment 1, since the container 6 is arranged outside the cooling tower 2, it is easy to check the remaining amount of the solid drug 8 in the container 6 and to replenish the solid drug 8. It is preferable that the container 6 itself is transparent so that the inside of the container 6 can be visually recognized, or that a transparent window portion is provided in a part of the container 6. This makes it easier to check the remaining amount of the solid drug 8.

Further, in the cooling tower equipment 1, the container 6 is arranged so that the outlet 6c is located 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 the power of a pump or the like to supply the drug solution. Therefore, a pump or the like is not required, and the equipment cost can be suppressed. Further, since the running cost for supplying the chemical solution can be substantially only the cost of the chemical itself, the management cost of the cooling water can be suppressed.

Further, in the cooling tower equipment 1, the chemical injection line 6d can be formed only by a horizontal portion and a downward portion. In addition to this configuration, by providing the outlet 6c at the bottom of the container 6, the drug solution that stays in the container 6 when the dissolved water is not supplied is substantially eliminated, so that the drug solution is unexpected in the container 6. It is possible to prevent the concentration from becoming high, and it is possible to stabilize the drug concentration in the cooling water 3.

In the above example, the inflow amount 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 water level of the cooling water to rise to a predetermined height in the container 6 when the drug is dissolved. By providing the inflow amount adjusting valve 6b and the outflow amount adjusting valve, it is possible to prepare a highly concentrated drug solution as needed, for example, when increasing the drug concentration in the cooling water according to seasonal fluctuations. Further, 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 equipment 1, only when the make-up water is supplied to the cooling tower 2, the solid drug 8 can be dissolved and the drug solution can be supplied, and the supply amount of the drug is linked to the make-up water amount of 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 equipment 1. Then, it is possible to prevent troubles such as corrosion and odor of the structural material of the cooling tower equipment 1 due to the excessive addition of the chemical.

Further, since the cooling water (circulating 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 may be covered with scale to prevent the solid drug from being dissolved, and stable drug dissolution and supply may not be possible. On the other hand, in the present invention, since make-up water having a low salt concentration is used for dissolving the solid drug 8, there is no such risk.

In the present invention, the type of make-up water (including forced make-up water) is not particularly limited, and raw water such as tap water, well water, groundwater, and industrial water can be used. Further, it is also possible to treat these raw waters with an ion exchange resin or the like and use treated water as soft water or desalinated water as make-up water.

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

Here, as in the cooling tower facility 9 shown in the schematic diagram in FIG. 3, by connecting the dissolved water supply line 5f of the chemical injection device B to the spout of the ball tap 5b, the chemical is not supplied at the time of blowing by forced replenishment. In addition, the chemical solution can be supplied only when the make-up water is supplied when the water level of the cooling water 3 in the lower water tank 2d drops. 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 spout of the ball tap 5b.

Further, 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, the cooling tower equipment 9 also has a large load, that is, a large amount of evaporation of the cooling water 3, or a small load, that is, evaporation of the cooling water 3, as in the cooling tower equipment 1. Even when the amount is small, it is possible to inject the drug 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, but 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. It may be possible to supply to the water tank 2d. Of the members and equipment constituting the cooling tower equipment 9 shown 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, the description is omitted.

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

As described above, according to the drug injection device of the present embodiment, the container for accommodating the solid drug arranged outside the cooling tower and at least a part of the make-up water supplied to the cooling tower are solidified. It is provided with at least a dissolved water supply line for supplying dissolved water for dissolving the drug, and an inlet and an outlet for the dissolved water are provided at the bottom or near the bottom of the container for accommodating the solid drug so as to be separated from each other. By connecting one end of the dissolved water supply line to the inflow port, it is possible to obtain a stable chemical solution, and the chemical injection amount is adjusted according to the load of the cooling tower. It is possible to control, and it is possible to easily confirm the remaining amount of the solid drug and replenish it.

Then, among the solid chemicals stacked and stored in the container, only the solid chemicals up to a desired height determined by the attachment positions of the inlet and outlet to the container can come into contact with the dissolved water, so that an excessive amount is obtained. The dissolution of the solid drug can prevent the formation of an unexpectedly high concentration drug solution and the loss of the solid drug in the container in an unexpected short period of time, and the drug concentration in the cooling water can be maintained for a long period of time. , Can be maintained stably. In addition, 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 make-up water increases, and as a result, the amount of dissolved water supplied also increases, and a large amount of chemicals are supplied to the cooling tower. It becomes possible.

Further, since the inlet and the outlet are provided at positions separated from each other, the solid drug and the dissolved water can be brought into good contact with each other, which contributes to the stable maintenance of the drug concentration in the above-mentioned cooling water. be able to.

In addition, instead of using cooling water to dissolve the solid drug, only make-up water with good water quality, which contains less hardness components such as calcium and impurities such as silica than cooling water, can be brought into contact with the solid drug. can. Therefore, stable solubility can be obtained, and it is possible to prevent clogging at the outlet and the chemical injection line due to contamination of dust and the like and scale. Since the make-up water is not supplied to this container when the cooling tower equipment is not in operation, it is possible to prevent unnecessary dissolution and supply of the chemical even when the cooling tower equipment is stopped for a long period of time.

Further, by providing an inflow amount adjusting valve for adjusting the supply amount of the make-up water into the container and an outflow amount adjusting valve for adjusting the outflow amount of the drug solution, the supply amount of the drug solution into the cooling tower can be adjusted. Can be easily performed.

In addition, by installing a container for storing solid chemicals so that the outlet is located higher than the water surface of the cooling water in the cooling tower, it is possible to supply the chemical solution without using the power of a pump or the like. , Equipment cost can be suppressed.

Further, the cooling tower equipment of the present invention is provided with the above-mentioned chemical injection device, so that the chemical solution can be supplied according to the load of the cooling tower equipment. In addition, fluctuations in the drug concentration in the cooling water can be suppressed, and the effect of the drug can be stably maintained for a long period of time.

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

Those skilled in the art can appropriately modify the medicinal injection device and the cooling tower equipment of the present invention according to conventionally known knowledge. Such modifications are, of course, included in the scope of the present invention as long as the medicinal injection device and the cooling tower equipment of the present invention are provided.

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

As an example, the cooling tower equipment 1 (refrigerating capacity 500 RT, holding water amount 10 m ³ ) shown in FIG. 1 and, as a comparative example, as shown in FIG. Except for using the chemical injection device A'to which the cooling water 3 circulating in the cooling tower 2 and the heat exchanger 4b is supplied, the same cooling tower equipment 1'(refrigerating capacity 500RT, holding water amount 10m ³ ) is used, and operating conditions are used. These cooling tower equipments 1 and 1'were operated for air conditioning in the same manner. In FIG. 4, the cooling water 3 flows into the container 6'through the cooling water introduction pipe 4d2 that branches from the branch portion 4d1 of the cooling water return pipe after passing through the heat exchanger 4b. Then, the drug solution after the drug is dissolved is supplied from the container 6'to the cooling tower 2 via the drug injection line 6d'.

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

As a result, the fluctuation of the free residual chlorine concentration 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, as compared with the example. The fluctuation of the concentration 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. The range of fluctuation in concentration was larger than that in the examples. From these results, in the case of the chemical injection device and the cooling tower equipment of the example, a chemical solution having a stable concentration can be obtained as compared with the chemical injection device and the cooling tower equipment of the comparative example, and stable water treatment can be performed. It turned out to be possible.

A, A', B Chemical injection device 1, 1', 9 Cooling tower equipment 2 Cooling tower 2a Fan 2b Sprinkler pipe 2c Filling material 2d Lower water tank 2e Overflow pipe 3 Cooling water 4a Cooling water circulation pump 4b Heat exchanger 4c Cooling water forward Piping 4d Cooling water return pipe 4d1 Branch 4d2 Cooling water introduction pipe 5 Makeup water supply line 5a Makeup water line 5b Ball tap 5c Forced make-up water line 5d Forced make-up valve 5e, 5f Dissolved water supply line 5m Back pressure valve 6, 6'Container 6a Inflow port 6b, 6b'Inflow control valve 6c Outlet 6d, 6d'Drug injection line 6e Cap 7 Electric conductivity meter 8 Solid drug

Claims (3)

A container for storing solid chemicals placed outside the cooling tower,
A forced make-up water line equipped with a forced make-up valve that forcibly supplies forced make-up water to the cooling tower,
At least a part of the forced replenishment water is connected to a branch portion of the forced replenishment water line provided downstream of the forced replenishment valve in the flow direction of the forced replenishment water, and at least a part of the forced replenishment water is used as dissolved water for dissolving the solid drug. The dissolved water supply line supplied to the container and
At least prepare
The bottom of the container for accommodating the solid drug is provided with an inlet and an outlet for the dissolved water separated from each other.
One end of the dissolved water supply line is connected to the inflow port and
A pipe for supplying the drug solution prepared in the container to the cooling water of the cooling tower is connected to the outlet, and the outlet is connected to the outlet.
The dissolved water supply line is provided with an inflow amount adjusting valve for adjusting the inflow amount of the dissolved water into the container .
In the forced make-up water line, a back pressure valve for adjusting the inflow amount of the dissolved water into the container for accommodating the solid drug together with the inflow amount adjusting valve is provided downstream of the branch portion in the flow direction. A drug injection device characterized by the fact that. The drug injection device according to claim 1 , wherein the container for accommodating the solid drug is arranged so that the outlet is located at a position higher than the water surface of the cooling water in the lower water tank of the cooling tower. A cooling tower facility comprising the drug injection device according to claim 1 or 2 .

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