JP6910040B2 - Chemical solution heating device and chemical solution heating method - Google Patents

Description

The present invention relates to a chemical solution heating device and a chemical solution heating method. Specifically, the present invention can heat a chemical solution tank containing a chemical solution as a water treatment agent added to cooling water of a cooling water system for cooling industrial equipment, air conditioning equipment, etc. The present invention relates to a chemical liquid heating device and a chemical liquid heating method.

Cooling water (circulating water) of the cooling water system that cools the heat source of industrial equipment, air conditioning equipment, etc. installed in factories, buildings, etc. is usually heated by heat exchange and then in a cooling device (heat dissipation part) such as a cooling tower. It is cooled by latent heat of evaporation and is circulated again as cooling water. Therefore, the salts contained in the cooling water are gradually concentrated to a high concentration, which induces the growth of microorganisms and the formation of slime, which causes various disorders.
That is, microorganisms such as bacteria and fungi adhere to the pipe wall and the vessel wall in the cooling water system and secrete a sticky substance to form slime. Then, this slime adheres to the cooling water system, particularly to the heat exchanger, lowers the heat exchange performance, causes corrosion of the pipe wall and the vessel wall, and causes hygienic problems due to the scattering of pathogenic bacteria.

In general, the cooling water system has three major troubles of slime, corrosion and scale, and in order to prevent these, the addition of various water treatment agents has been studied and implemented.
The chemicals (active ingredients) contained in the water treatment agent are roughly classified into chemicals for sterilization, anticorrosion, and scale prevention, and the water treatment agent containing one or more kinds of chemicals dissolves quickly and uniformly in the cooling water. In addition, it is desirable that the drug concentration is in a liquid form because it is easy to control the drug concentration.

A chemical injection device equipped with a chemical tank for accommodating a chemical (liquid water treatment agent) is often installed outdoors. Therefore, in a low temperature environment where the outside air temperature is low, the solid content in the chemical solution in the chemical solution tank may precipitate. In addition, the chemical solution in the connection portion connecting the chemical solution tank and the cooling water line may be deposited.
Therefore, for example, Patent Documents 1 to 3 propose chemical solutions that suppress precipitation in a low temperature environment.

Japanese Patent No. 4277064 Japanese Patent No. 5140927 Japanese Patent No. 5648194

The chemical solution is often adjusted to a recipe (ingredient ratio) according to the cooling water system in which it is actually used, and a recipe that provides even lower temperature stability when it is necessary to suppress precipitation in a low temperature environment. Is changed to.
Therefore, it is necessary for a water treatment agent manufacturer to manufacture and manage inventory of various kinds of chemical solutions according to various cooling water systems and usage environments.

It should be noted that, instead of obtaining low temperature stability by changing the chemical solution recipe, a method of preventing the precipitation of the chemical solution in a low temperature environment by the heat of the heater wound around the chemical solution tank and the outer peripheral portion of the connection portion can be considered. The method is difficult for water treatment agent users to accept because of the initial cost (equipment cost) and running cost (electricity cost).

The present invention has been made in view of such a problem, and it is possible to suppress an increase in the types of chemicals and prevent precipitation of chemicals to be used in a low temperature environment without incurring running costs. It is an object of the present invention to provide a chemical solution heating device and a chemical solution heating method.

Thus, according to the present invention, a water introduction portion connected to a cooling water line for circulating cooling water between a heat source and a heat radiating portion or a blow water line branched from the cooling water line, and a water treatment chemical solution added to the cooling water. It is provided with a heat exchange unit provided in the chemical liquid tank of the above and connected to the water introduction unit, and a water discharge unit for connecting the heat exchange unit and a cooling water line or a blow water line.
The cooling water or blow water is introduced into the heat exchange section via the water introduction section to exchange heat between the chemical solution in the chemical solution tank and the cooling water or blow water, and the cooling water or blow water after heat exchange is performed. Provided is a chemical heating device configured to return blow water from the heat exchange section to the cooling water line via the water discharge section or to discharge the blow water to the outside.

Further, according to another aspect of the present invention, the water treatment chemical solution added to the cooling water in the circulating cooling water line connected to the heat source and the heat radiating portion is branched from the cooling water or the cooling water line. A chemical solution heating method for heating using blow water in a blow water line is provided.

According to the present invention, the cooling water or blow water of the cooling water system heated to a temperature that does not freeze even in a low temperature environment of 0 ° C. or lower (for example, about 5 to 10 ° C.) and the chemical solution in the chemical solution tank are separated. Heat can be exchanged. Therefore, it is possible to heat the chemical solution in the chemical solution tank installed in a low temperature environment so as not to lower the temperature of the chemical solution below the precipitation generation temperature.
That is, instead of changing the chemical solution recipe in order to obtain low temperature stability, the chemical solution can be heated by the cooling water or blow water flowing through the cooling water system to prevent precipitation, so that the increase in the chemical solution type is suppressed. , The burden on the water treatment agent manufacturer can be reduced.

Further, in the circulation type cooling water system, since the heat of the circulated cooling water is released by the heat radiating part and reused, the heat exchange of the cooling water with the chemical solution in the low temperature environment becomes the preliminary cooling of the cooling water and is cooled. The cooling efficiency of the water system is improved. This is a merit that can be obtained by users of water treatment agents, and is particularly effective when the chemical liquid heating device of the present invention is provided on the downstream side of the existing heat exchanger that cools a heat source such as an industrial device in a cooling water system. be.
Further, the chemical heating device of the present invention is excellent in versatility because it can be applied to any type of cooling water system and chemical liquid, and the heat source for heating the chemical liquid is only the cooling water or blow water flowing through the existing cooling water system. Since it does not incur running costs such as electricity costs, it is easily accepted by users of water treatment agents in consideration of the above-mentioned merits.

It is a schematic block diagram which shows the cooling water system provided with the chemical liquid heating apparatus of Embodiment 1 of this invention. It is a schematic block diagram which shows the cooling water system provided with the chemical liquid heating apparatus of Embodiment 2 of this invention. It is a schematic block diagram which shows the cooling water system provided with the chemical liquid heating apparatus of Embodiment 3 of this invention. It is a schematic block diagram which shows the cooling water system provided with the chemical liquid heating apparatus of Embodiment 4 of this invention. It is a schematic block diagram which shows the cooling water system provided with the chemical liquid heating apparatus of Embodiment 5 of this invention.

The chemical heating device of the present invention has a water introduction section connected to a cooling water line that circulates cooling water between a heat source and a heat radiating section or a blow water line branched from the cooling water line, and a water treatment added to the cooling water. It is provided with a heat exchange unit provided in the chemical liquid tank of the chemical liquid and connected to the water introduction unit, and a water discharge unit for connecting the heat exchange unit and the cooling water line or the blow water line.
The cooling water or blow water (preferably cooling water or blow water heated by a heat source) is introduced into the heat exchange section via the water introduction section to introduce the chemical solution in the chemical solution tank and the cooling water or blow water. It is configured to exchange heat with water and return the cooling water or blown water after heat exchange from the heat exchange section to the cooling water line via the water discharge section or to discharge the blow water to the outside.

The chemical heating device of the present invention may be configured as follows, or they may be combined as appropriate.

(1) The heat exchange unit has a hollow tank support plate that abuts and supports the bottom of the chemical solution tank.
The tank support plate may be configured to be connected to the water introduction portion and the water discharge portion to allow cooling water or blow water to flow inside.
In this way, the chemical solution in the chemical solution tank can be heated by the cooling water or blow water flowing in the tank support plate. At this time, since the chemical solution near the bottom of the chemical solution tank is heated and rises, convection of the chemical solution occurs in the chemical solution tank, and the chemical solution is uniformly heated. In this case, the outer peripheral surface of the chemical solution tank may be covered with a heat insulating material, and in this case, the thermal efficiency is improved.
Further, since the tank support plate has a simple structure, the manufacturing cost of the heat exchange section can be kept low.

(2) The heat exchange unit has a tank storage container for storing the chemical solution tank.
The tank storage container may be configured to be connected to the water introduction section and the water discharge section to allow cooling water or blow water to flow between the tank storage container and the chemical solution tank.
In this way, the chemical solution tank can be entirely covered with cooling water or blow water by using a heat exchange unit having a simple structure, so that the chemical solution can be effectively heated.

(3) The heat exchange portion has a spiral piping portion wound around the outer peripheral surface of the chemical liquid tank.
The spiral piping portion may be configured to be connected to the water introduction portion and the water discharge portion to allow cooling water or blow water to flow inside.
In this case, for example, since the spiral piping portion can be formed of a commercially available flexible pipe such as a durable rubber pipe, the heat exchange portion can be manufactured at low cost.

(4) The heat exchange unit may be configured so that the chemical solution in the connecting pipe connecting the chemical solution tank to the cooling water line or the blow water line can exchange heat with the cooling water or the blow water.
In this way, the chemical solution in the connecting pipe can also be heated, which is particularly effective when the connecting pipe is long.

Hereinafter, each embodiment of the chemical solution heating device of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram showing a cooling water system provided with a chemical solution heating device according to the first embodiment of the present invention.
First, the configuration of the cooling water system 10 provided with the chemical solution heating device 20 of the first embodiment will be described.

<About the configuration of the cooling water system>
The cooling water system 10 mainly includes a cooling tower 11, a cooling water line 12 connected to the cooling tower 11 to circulate the cooling water W, a main pump 13 provided in the cooling water line 12, and a cooling water line 12. A chemical solution tank 14, a chemical solution heating device 20, and a chemical solution injection device 30 including a chemical solution concentration measurement control unit 31 are provided.

More specifically, the cooling water system 10 is provided with the refrigerator 15, and the refrigerator 15 is connected to the cold water line 16. When the cooling water system 10 is provided in a factory, a power plant, etc., the cold water line 16 is mainly provided so as to exchange heat with industrial equipment, and when the cooling water system 10 is provided in a building, a station, an airport, etc. The cold water line 16 is mainly provided so as to be heat exchangeable with the air conditioning equipment.

Although not shown, the cooling water system 10 includes a blow water line that branches from the cooling water line 12 and extracts a part of the cooling water W (blow water) and discharges it to the outside, and a new cooling water W (for example, industrial). A make-up water line for replenishing the cooling water line 12 with water), a collecting unit for collecting impurities in the cooling water W, and the like are provided.

The chemical tank 14 is a resin (for example, polyethylene) tank that contains a chemical (liquid water treatment agent) Ds that is added to the cooling water and contains an active ingredient that suppresses slime, corrosion, and / or scale. The upper part has a chemical replenishment port and a lid 14a that covers the chemical solution replenishment port so as to be openable and closable, and the lower part has a connection port 14b that is tightly connected to the connection pipe.
Further, in the case of the first embodiment, the outer peripheral surface of the chemical solution tank 14 may be covered with a heat insulating material 17 such as glass wool or polyurethane.

Here, examples of the slime-suppressing component include organic fungicides such as sodium hypochlorite and 5-chloro-2-methyl-4-isothiazolin-3-one, and examples of the corrosion-suppressing component include hydroxyethylidene-1, Examples thereof include 1-diphosphonic acid, zinc salt, and triltriazole, and examples of the scale-suppressing component include acrylic acid-based polymers and maleic acid-based polymers.

The chemical liquid heating device 20 includes a heat exchange unit 21 configured to be able to exchange heat between the chemical liquid in the chemical liquid tank 14 and the cooling water W flowing through the cooling water line 12.
In the case of the first embodiment, the heat exchange unit 21 has a hollow tank support plate 21a that abuts and supports the bottom of the chemical liquid tank 14, and water introduction that introduces the cooling water W from the cooling water line 12 into the tank support plate 21a. It has a portion 21b and a water discharge portion 21c that discharges the cooling water W in the tank support plate 21a to the cooling water line 12.

The tank support plate 21a is a hollow plate, and a rib structure for reinforcement is provided inside. _{Further, introduction ports 21a 1} and discharge ports 21a ₂ connected to the water introduction section 21b and the water discharge section 21c are provided at two locations (preferably opposite positions) on the outer peripheral wall constituting the tank support portion rate 21a. .. Further, the introduction port 21a ₁ and the discharge port 21a ₂ communicate with each other in the tank support plate 21a.

The tank support plate 21a is made of a material having durability, weather resistance, corrosion resistance, chemical resistance, etc., and can be formed of, for example, a metal such as stainless steel or titanium, or a resin such as high-density polyethylene for cooling. The same material as the material constituting the water line 12 may be used.

The water introduction portion 21b is an introduction-side first bypass pipe that connects a portion of the cooling water line 12 on the downstream side of the cooler 15 and an introduction port 21a ₁ of the tank support plate 21a, and is an introduction-side first bypass pipe. May be provided with a valve 21b _1.
The water discharge section 21c is a discharge side first bypass pipe that connects a portion of the cooling water line 12 downstream of the water introduction section 21b and the discharge port 21a _{2 of the tank support plate 21a, and is a discharge side first bypass pipe.} The pipe may be provided with a _{valve 21c 1.}

The chemical solution injection device 30 is a device that injects the chemical solution Ds in the chemical solution tank 14 into the cooling water W flowing through the cooling water line 12 at a predetermined injection amount, and is a second bypass pipe on the introduction side connected to the cooling water line 12. An injector 32 provided between the 35a and the second bypass pipe 35b on the discharge side, a connection pipe 33 connecting the chemical liquid tank 14 and the injector 32, and a flow rate adjusting valve (flow rate adjusting valve 35a) provided on the second bypass pipe 35a on the introduction side. The electric valve) 34 and the chemical concentration measurement control unit 31 capable of controlling the flow rate adjusting valve 34 are provided.

The injector 32 causes the inflow portion 32a that introduces the cooling water W from the cooling water line 12 into the inside and the cooling water W that has flowed into the inflow portion 32a to be made lower than the pressure at the time of inflow and flows out to the cooling water line 12. It has an outflow portion 32b and a chemical liquid suction portion 32c that is connected to the connection pipe 33 and sends the chemical liquid Ds between the inflow portion 32a and the outflow portion 32b, and a commercially available product can be used.

In the case of the first embodiment, the space between the water introduction unit 21b and the water discharge unit 21c in the cooling water line 12 and the downstream side of the water discharge unit 21c in the cooling water line 12 are bypassed on the introduction side second via the injector 32. It is connected by a pipe 35a and a second bypass pipe 35b on the discharge side. Therefore, the chemical solution Ds is injected to the downstream side of the water discharge portion 21c in the cooling water line 12.

In the case of the first embodiment, the control unit 31 is a device corresponding to the fluorescence tracer method, and for example, “3D TRASAR” (registered trademark) manufactured by Katayama Narco Co., Ltd. can be used.
The control unit 31 corresponding to the fluorescence tracer method irradiates a fluorescent substance as an index substance as an index of the concentration of the chemical solution in the cooling water W with light of a specific wavelength, and the emission intensity (reflected light) of the fluorescent substance excited and emitted by the irradiation. The concentration of the chemical solution Ds in the cooling water W can be indirectly measured by measuring the strength of the chemical solution Ds.

Therefore, a predetermined amount of fluorescent substance according to the type and mass of the active ingredient is added to the chemical solution Ds in the chemical solution tank 14.
In the case of the first embodiment, examples of the fluorescent substance include naphthalene sulfonates and the like.

The control unit 31 is provided in, for example, a circulation path 37a in which the cooling water W at the lower part of the cooling tower 11 is pumped up by the pump 37b and returned to the inside of the cooling tower 11 again, and the cooling water W is continuously introduced (flowed). While measuring the emission intensity of the fluorescent substance in the cooling water W, it is determined whether or not the measured emission intensity (measured value) is within the range of the reference emission intensity (set value) set and input in advance.
Further, the control unit 31 is electrically connected to the control circuit of the motor M of the flow rate adjusting valve 34, and as a result of the above determination, if the measured value falls below the lower limit of the set value, the opening degree of the flow rate adjusting valve 34 is increased. A command signal for driving and controlling the motor M is transmitted from the control unit 31 to the control circuit, and if the measured value exceeds the upper limit of the set value, a command signal for driving and controlling the motor M to reduce the opening degree of the flow rate adjusting valve 34 is sent. It is transmitted from the control unit 31 to the control circuit.

<About the operation of the cooling water system>
By driving the cooling tower 11 and the main pump 13, the cooling water W circulates in the cooling water line 12 in the direction of arrow A.
During this time, the cooling water W in the cooling water line 12 is heated by exchanging heat with the cold water in the cold water line 16 via the refrigerator 15, and a part of the warmed cooling water W is introduced into the water of the chemical liquid heating device 20. It flows into the tank support plate 21a through the section (first bypass pipe on the introduction side) 21b, passes through the water discharge section (first bypass pipe on the discharge side) 21c, and merges with the cooling water W in the cooling water line 12 again.

At this time, for example, even when the outside air temperature is around 0 ° C., the water temperature of the cooling water W flowing into the tank support plate 21a is always 5 to 10 ° C. or higher, so that the cooling water W and the chemical solution in the tank support plate 21a are always present. By exchanging heat with the chemical solution Ds in the tank 14, the lower chemical solution Ds in the chemical solution tank 14 is heated. On the other hand, the upper chemical solution Ds in the chemical solution tank 14 is not heated, but convection occurs in the chemical solution tank 14 and the entire chemical solution Ds becomes uniform to the same temperature as the cooling water W. Further, by covering the outer peripheral surface of the chemical liquid tank 14 with the heat insulating material 17, the heat retaining effect of the chemical liquid Ds can be obtained, so that the thermal efficiency of the chemical liquid heating device 20 is improved.

As described above, according to the chemical solution heating device 20 of the present invention, the cooling water W flowing through the existing cooling water line 12 is effectively used as a heat source for heating the chemical solution Ds in the chemical solution tank 14, so that the temperature environment is low. It is possible to prevent the precipitation of the chemical solution Ds below without consuming new energy. Further, since it is not necessary to change the recipe of the active ingredient in the chemical solution Ds to prevent precipitation, it is possible to suppress an increase in the types of the chemical solution Ds. Further, since the cooling water W is cooled by heat exchange with the chemical liquid Ds, the cooling efficiency of the cooling water W in the cooling tower 11 is improved.

A part of the cooling water W that does not pass through the chemical liquid heating device 20 flows into the injector 32 through the introduction side second bypass pipe 35a of the chemical liquid injection device 30, and is cooled again through the discharge side second bypass pipe 35b. It merges with the cooling water W in the water line 12. At this time, in the injector 32, the pressure in the outflow portion 32b becomes lower than the pressure in the introduction portion 32a, the inside of the chemical liquid suction portion 32c becomes a negative pressure due to the Bernoulli effect, and the chemical liquid Ds in the chemical liquid tank 14 becomes the injector 32. Since it is drawn into the cooling water W, the cooling water W mixed with the chemical solution Ds is discharged from the injector 32 to the cooling water line 12. The flow rate of the chemical solution Ds at this time depends on the flow velocity (flow rate) of the cooling water W discharged from the injector 32 to the cooling water line 12.

Then, the cooling water W returned to the cooling tower 11 is sprayed and cooled in a shower shape in the updraft generated by the rotating fan 11a, and circulates in the cooling water line 12 again.
Further, a part of the cooling water W accumulated in the lower part of the cooling tower 11 circulates in the circulation path 37a of the chemical injection device 30, and at this time, the emission intensity of the fluorescent substance in the cooling water W introduced into the control unit 31. Is continuously measured.

The control unit 31 transmits a command signal based on the measured value to the flow rate adjusting valve 34 as described above, thereby adjusting the flow rate of the cooling water W passing through the second bypass pipe 35a on the introduction side of the flow rate adjusting valve 34. That is, when the measured value of the emission intensity of the fluorescent substance (concentration of the chemical solution in the cooling water) falls below the lower limit of the set value, the flow rate of the cooling water W passing through the second bypass pipe 35a on the introduction side is increased, and the measured value (the chemical solution in the cooling water) is increased. When the concentration) exceeds the upper limit of the set value, the flow rate of the cooling water W passing through the second bypass pipe 35a on the introduction side is controlled to be reduced.
As a result, the flow rate of the cooling water W passing through the injector 32 is adjusted according to the concentration of the chemical solution Ds in the cooling water W, and the injection amount of the chemical solution Ds injected into the injector 32 is also appropriately adjusted.

_{In the chemical solution heating device 20 of the first embodiment configured in this way, the valves 21b 1} and 21c are used in an outside air temperature environment (for example, from spring to autumn) in which the chemical solution Ds in the chemical solution tank 14 does not precipitate. ₁ may be closed to prevent the cooling water W from passing through the tank support plate 21a. In particular, when the temperature of the chemical solution Ds in the chemical solution tank 14 becomes higher than the temperature of the cooling water W introduced into the tank support plate 21a, the cooling water W in the tank support plate 21a is caused by the chemical solution Ds in the chemical solution tank 14. In such a case, the valves 21b ₁ and 21c ₁ are closed to prevent the cooling water W from passing through the tank support plate 21a, so that the cooling efficiency of the cooling water W by the cooling tower 11 can be improved. It can be prevented from lowering.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram showing a cooling water system provided with a chemical solution heating device according to a second embodiment of the present invention. In FIG. 2, the same elements as those in FIG. 1 are designated by the same reference numerals.
Hereinafter, a configuration different from that of the first embodiment in the second embodiment will be mainly described.

In the second embodiment, the chemical heating device 120 is a water introduction unit that introduces the cooling water W from the cooling water line 12 and the tank storage container 121a for accommodating the chemical liquid tank 14 and the chemical liquid tank 14. A heat exchange unit 121 having a (first bypass pipe on the introduction side) 21b and a water discharge unit (first bypass pipe on the discharge side) 21c for discharging the cooling water W in the tank storage container 121a to the cooling water line 12 is provided.

The tank storage container 121a has an upper opening having _{an introduction port 121a 1} provided at the lower part thereof and connected to the water introduction part 21b and _{a discharge port 121a 2} provided at the upper part thereof and connected to the water discharge part 21c. It is a container and is made of the same material as the tank support plate 21a in the first embodiment. _{Further, in the lower part of the tank storage container 121a, an insertion hole 121a 3} is provided to allow the connection pipe 33 of the chemical liquid injection device 130 to be liquid-tightly inserted.

In the case of the second embodiment, a block-shaped spacer 18 may be installed between the bottom of the chemical solution tank 14 and the bottom of the tank storage container 121a so that the bottom of the chemical solution tank 14 comes into contact with the cooling water W. Further, an annular lid may be provided to prevent dust from entering the cooling water W from the upper opening of the tank storage container 121a.

Further, in the second embodiment, the chemical solution injection device 130 has substantially the same configuration as the chemical solution injection device 30 in the first embodiment, but the configuration of the flow rate adjusting valve 134 and its mounting position are different from those of the first embodiment.
In the case of the second embodiment, an electric three-way valve is provided as a flow rate adjusting valve 134 at the connection point between the cooling water line 12 and the introduction side second bypass pipe 35a, and the control circuit of the motor M of the electric three-way valve is provided. The control unit 31 is electrically connected.

In the case of the second embodiment, when the control unit 31 determines that the concentration of the chemical solution in the cooling water exceeds the upper limit of the set value on the downstream side of the flow rate adjusting valve 134 (electric three-way valve), the control unit 31 Switched the flow rate adjustment valve 134 so that the cooling water did not flow to the second bypass pipe 35a on the introduction side and the cooling water flowed only to the cooling water line 12, and the chemical solution concentration in the cooling water fell below the lower limit of the set value. When the control unit 31 determines that the flow rate is set, the control unit 31 switches the flow rate adjusting valve 134 so that the flow path is set so that the cooling water flows through the second bypass pipe 35a on the introduction side. At this time, the cooling water may or may not flow to the cooling water line 12.
According to the second embodiment configured in this way, the same effect as that of the first embodiment can be obtained.

(Embodiment 3)
FIG. 3 is a schematic configuration diagram showing a cooling water system provided with the chemical solution heating device according to the third embodiment of the present invention. In FIG. 3, the same reference numerals are given to the same elements as those in FIGS. 1 and 2.
Hereinafter, configurations different from those of the first and second embodiments of the third embodiment will be mainly described.

The chemical heating device 220 according to the third embodiment includes a heat exchange unit 221 similar to the heat exchange unit 121 according to the second embodiment, and has a tank storage container 221a for entirely accommodating the chemical liquid tank 214. .. The point that the tank storage container 221a is connected to the cooling water line 12 via the water introduction section 21b and the water discharge section 21c is the same as that of the second embodiment.

In the case of the third embodiment, the chemical solution tank 214 is a closed type in which the cooling water W does not flow in, and an air vent 214a and a chemical solution replenishment pipe 214b with a valve are provided above the closed type. The air vent 214a and the chemical liquid replenishment pipe 214b penetrate the top plate of the tank storage container 221a in a liquid-tight manner and are exposed to the outside.

Further, in the chemical injection device 230 of the third embodiment, the introduction side and discharge side second bypass pipes 35a and 35b provided in the first and second embodiments are omitted, and the injector 32 is directly provided in the cooling water line 12. Further, the flow rate adjusting valve 34 is provided in the connecting pipe 33.
According to the third embodiment configured in this way, the same effects as those of the first and second embodiments can be obtained.

(Embodiment 4)
FIG. 4 is a schematic configuration diagram showing a cooling water system provided with the chemical solution heating device according to the fourth embodiment of the present invention. In FIG. 4, the same reference numerals are given to the same elements as those in FIGS. 1 to 3.
Hereinafter, configurations different from those of the first to third embodiments of the fourth embodiment will be mainly described.

The chemical heating device 320 according to the fourth embodiment includes a heat exchange unit 321 similar to the heat exchange unit 221 according to the third embodiment, and is a tank storage container 321a that accommodates the entire chemical solution tank 214 to the injector 32. have. The point that the tank storage container 321a is connected to the cooling water line 12 via the water introduction section 21b and the water discharge section 21c is the same as that of the third embodiment.
Further, in the fourth embodiment, the configuration of the liquid injection device 230 is the same as that of the third embodiment.

According to the fourth embodiment configured in this way, the same effects as those of the first to third embodiments can be obtained. Further, in the fourth embodiment, the chemical solution Ds in the connecting pipe 33 from the chemical solution tank 214 to the injector 32 can also be heated by the cooling water W to prevent precipitation, and therefore, particularly because the connecting pipe 33 is long. It is suitable when the chemical solution Ds is deposited even in the connecting pipe 33.
The configuration of the fourth embodiment in which the chemical solution Ds in the connecting pipe 33 from the chemical solution tank 214 to the injector 32 is also heated by the cooling water W is also applicable to the first to third embodiments.

(Embodiment 5)
FIG. 5 is a schematic configuration diagram showing a cooling water system provided with the chemical solution heating device according to the fourth embodiment of the present invention. In FIG. 5, the same elements as those in FIGS. 1 to 4 are designated by the same reference numerals.
Hereinafter, configurations different from those of the first to fourth embodiments of the fifth embodiment will be mainly described.

In the first to fourth embodiments, the case where the chemical heating device of the present invention is provided in the cooling water system 10 that indirectly exchanges heat with industrial equipment, air conditioning equipment, etc. via the refrigerator 15 and the chilled water line 16 is illustrated. However, the present invention is not limited to such application to the cooling water system 10.
For example, the chemical heating device of the first to fourth embodiments is applied to the cooling water system 110 provided in the cooling water line 112 with equipment for directly cooling the high temperature steel material F manufactured in the steel mill with the cooling water W. can do.

Further, in the first to fourth embodiments, the case where the chemical injection device provided with the injector 32 is used is illustrated, but the injector 32, the introduction side and the discharge side second bypass pipes 35a and 35b are omitted, and the chemical liquid tank 14 and the cooling are performed. The metering pump 19 may be provided in the connecting pipe 33 connecting the water line 112, and the metering pump 19 may be controlled by the control unit 31 to control the injection amount of the chemical solution Ds into the cooling water W.
As in the fourth embodiment, the chemical solution Ds inside the connecting pipe 33 and the metering pump 19 may also be heated by the cooling water W.

(Embodiment 6)
Examples of the heat exchange unit in the present invention include those having the following configurations (not shown) in addition to the first to fifth embodiments.
That is, the heat exchange section in the sixth embodiment includes a spiral piping section wound around the outer peripheral surface of the chemical liquid tank, a water introduction section for introducing cooling water from the cooling water line into the spiral piping section, and cooling water in the spiral piping section. It has a water discharge unit that discharges to the cooling water line.
In this case, for example, since the spiral piping portion can be formed of a commercially available flexible pipe such as a durable rubber pipe, the heat exchange portion can be manufactured at low cost.

(Embodiment 7)
The cooling water system shown in FIGS. 1 to 5 is provided with a blow water line (not shown) branched from the cooling water line. The chemical solution heating device and the chemical solution heating method of the present invention are not limited to heating the chemical solution in the chemical solution tank with cooling water as in the first to sixth embodiments, and use blow water flowing through the blow water line. It also includes the case of heating the chemical solution.

(Other embodiments)
1. 1. In the first to fifth embodiments, the case where the concentration of the active ingredient of the chemical solution in the cooling water is indirectly measured by measuring the emission intensity of the fluorescent substance in the cooling water has been illustrated, but the fluorescent substance is bound to the active ingredient of the chemical solution. The active ingredient concentration may be measured directly, or these may be performed at the same time.

2. In the first to fifth embodiments, the case where the concentration of the active ingredient of the chemical solution in the cooling water is measured by the fluorescent tracer method is illustrated, but in addition to the fluorescent tracer method, a bromine tracer method, a lithium tracer method, a dye tracer method and the like are used. You may.

It should be noted that the disclosed embodiments are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The chemical heating device of the present invention can be applied to a cooling water system for cooling industrial equipment, air conditioning equipment, etc. provided in factories, buildings, etc.

12, 112 Cooling water line 14,214 Chemical solution tank 20, 120, 220, 320 Chemical solution heating device 21, 121, 221 and 321 Heat exchange section 21a Tank support plate 21b Water introduction section (first bypass pipe on the introduction side)
21c Water discharge section (first bypass pipe on the discharge side)
33 Connection pipe 121a, 221a, 321a Tank storage container Ds Chemical solution W Cooling water

Claims (4)

A water introduction section connected to a cooling water line that circulates cooling water between a heat source and a heat dissipation section or a blow water line branched from the cooling water line, a chemical solution tank of a water treatment chemical solution added to the cooling water, and the chemical solution tank. A heat exchange unit provided in a connection pipe connecting the cooling water line or the blow water line and connected to the water introduction unit, and a water discharge unit connecting the heat exchange unit and the cooling water line or the blow water line. With and
The water introduction portion is branched at a portion downstream of the heat source in the cooling water line through which the cooling water heated by the heat source flows or on the downstream side of the heat source in the cooling water line, and the heat source is branched. It is connected to the blow water line through which the blow water heated by
The heat exchanging portion of the previous SL is heat exchanged with the chemical liquid in the chemical liquid tank and the cooling water or blowing water, and heat exchange between the chemical and the cooling water or blow water in the connecting pipe It is allowed, configured chemical warming device to discharge cooling water or blow water after the heat exchange to or outside through the front Symbol water discharge portion returns to the cooling water line within. The heat exchange section has a hollow tank support plate that abuts and supports the bottom of the chemical solution tank.
The chemical heating device according to claim 1, wherein the tank support plate is connected to the water introduction section and the water discharge section to allow cooling water or blow water to flow inside. The heat exchange unit has a tank storage container for storing the chemical solution tank, and has a tank storage container.
The first aspect of the present invention, wherein the tank storage container is connected to the water introduction unit and the water discharge unit so that cooling water or blow water flows between the tank storage container and the chemical liquid tank. Chemical solution heating device. The heat exchange section has a spiral piping section wound around the outer peripheral surface of the chemical solution tank.
The chemical heating device according to claim 1, wherein the spiral piping section is connected to the water introduction section and the water discharge section to allow cooling water or blow water to flow inside.

Images