KR20090096656A - Make-up water and blow down system for cooling tower - Google Patents

Abstract

A water supplement and forced drainage system of a cooling tower is provided to reduce sizes of a cooling water circulating pump and a cooling water pipe when the amount of circulated cooling water is reduced. A water supplement and forced drainage system of a cooling tower comprise a water supplement unit(30a) and a forced drainage unit(40). The water supplement unit includes a flow valve, a supplement water control valve(31a), a supplement water inflow pipe(32) and a supplement water outflow pipe(33). The flow valve supplies and blocks the supplement water. A water supplement outflow pipe is connected between a cooling water outflow pipe(25) and the supplement water control valve to supply the supplement water to a water collecting tank through the cooling water outflow pipe and a cooling water inflow pipe.

Description

Make-up water and blow down system for cooling tower

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to replenishment and forced drainage systems for cooling towers, in particular, replenishment of cooling water shortened by losses such as evaporation and scattering, cooling towers, cooling water outlet pipes, heat exchangers (condenser of condenser, cooling fluid). Cooler, etc.) and clean, low-temperature replenishment water supplied by forcing a predetermined amount of contaminated cooling water in the cooling water circulation system including the cooling water inlet pipe to the water tank through the cooling water outlet pipe, the heat exchanger, and the cooling water inlet pipe. Forced drainage through the cooling water inlet pipe located at the lower part of the sump and the forced drainage pipe connected to the drainage port of the sump to improve the efficiency of heat exchange and concentration mitigation and to reduce the cooling water. It relates to a forced drainage system.

Generally air conditioning and refrigeration. Refrigerators or industrial heat exchangers operating in refrigeration equipment, etc., are accompanied by waste heat to be removed, and in order to remove the waste heat, the waste heat must be discharged to the atmosphere using a cooling medium.

The cooling method of cooling tower is divided into air-cooled cooling that performs convective cooling by forced convection of atmospheric air that is lower in temperature than the fluid to be cooled, and evaporative cooling that uses the latent heat of evaporation by contact of cooling water and air. Cooling towers are widely used because they provide greater cooling and economical efficiency than any other cooling system.

Conventional evaporative cooling towers have a counter flow type cooling tower in which air flows vertically and cooling water flows vertically, and a cross flow in which air flows horizontally and the cooling water flows vertically. type) It is divided into cooling towers, and the flow of cooling water includes an open circuit type (e.g., open circuit type) in which evaporative heat exchange is performed by mutual contact while flowing a cooling heat exchanger (filler) in which cooling water and air are opened, and a cooling fluid (cooling water or refrigerant). Although it is generally classified into a closed circuit type in which evaporative heat exchange is performed while contacting the coolant and air on the outer surface of the sealed heat transfer coil in which gas flows, in recent years, the improvement of the heat exchange efficiency of the cooling tower and the reduction of water drop Development of Hybrid Circuit Type Cooling Tower with Open Cooling Heat Exchanger and Closed Cooling Heat Exchanger for the purpose of saving water and water There is increasing demand.

In the ventilation method, a suction ventilation type is provided at the exhaust port of the cooling tower and passes through the cooling heat exchange part to suck and discharge the hot air that has been heat-exchanged, and is installed in communication with the air supply of the cooling tower to pressurize the outside air toward the cooling heat exchange part. It is divided into a press-fitted ventilation type that discharges the high-temperature air after the heat exchange to the exhaust port.

Next, the evaporative cooling tower integrates the air pollutants contained in the air sucked to the extent that it is referred to as an anti-air pollution prevention device in the cooling water circulation system due to the characteristic of using atmospheric air as a cooling medium. Failure to organically remove contaminants introduced during operation of the cooling tower will continue to intensify, causing serious impediments to the cooling water circulation and heat exchange systems.

In addition, the evaporative cooling tower, the evaporation loss caused in the process of cooling the cooling water by using the latent heat generated while evaporating the predetermined cooling water, and the fine water droplets of the cooling water sprayed by the forced blow action is exhausted And the windage loss that is released to the louver (air supply) or the exhaust port by the drift loss that is discharged to the outside by piggyback, , Cooling water loss such as leakage loss caused by leakage of cooling water circulation system,

Cooling water loss of forced down loss that forcedly drains a certain amount of contaminated cooling water in order to alleviate the cooling water concentrated in salts and suspensions due to air pollutants entering the cooling water system by piggybacking the cooling water. Accompanying,

In order to prevent operation of the cooling tower, the cooling water loss (evaporation and scattering loss, etc.) generated during operation of the cooling tower and the cooling water loss due to the forced drainage for decentralization alleviate, thereby realizing Must be supplied.

In addition, the basic cooling water balance according to the loss of the cooling water and the make-up water supplementing the loss can be obtained from the following equation.

here,

N: Concentrated drainage (Drainage comparing the dissolved salt concentration and the make-up water concentration with circulating cooling water)

CR : Salt concentration in cooling water (mg / ℓ)

CM : Salt concentration in feed water (mg / ℓ)

M : Supply Quantity (l / h)

E : Evaporation loss (l / h)

W : scattering loss (l / h)

B : Forced drainage (l / h) has the following relationship.

Here, the concentrated drainage is;

....................................... (1)

....................................... (One)

If the cooling water circulation system is operated in a steady state, the following equation (2) is established.

............................ (2)

............................ (2)

The following formula (3) can be obtained by the formulas (1) and (2).

......................... (3)

......................... (3)

Moreover, when (3) is substituted into (1), following (4) is obtained.

..................................... (4)

..................................... (4)

Therefore, the concentrated wastewater of the cooling water circulation system can be obtained by the above formula.

For example, to condense refrigerant When the condenser is applied, the amount of heat received by the cooling water from the condenser and the amount of heat released by the evaporation of water in the cooling tower are the same, so the following equation (5) is established.

 R x10 ³  x ΔT x C = E x 10 ³ x H _L ...... (5)

here,

R : Circulating water amount (ℓ / h)

ΔT : Cooling tower inlet and outlet cooling water temperature difference (℃)

C : Static specific heat of water (kJ / kgK, 4,180 kJ / kgK at water temperature 40 ℃)

H _L : When the latent heat of evaporation of water (kJ / kgK, 2,428 kJ / kg at 40 ℃),

Evaporation loss ( E );

....................................(6)

..................... (6)

According to the formula (5), about 1% of the circulating water evaporates.

For reference, in the case of a 1000 R / T (37 ° C./32° C.) cooling tower for a standard air conditioner, the evaporation loss amount E will correspond to 7,800 l / h when the amount of circulating cooling water is 780,000 l / h.

However, in the summer when the temperature is high, the calculated evaporation loss and the actual evaporation loss are almost identical, but they correspond to about 70 ~ 80% in spring and autumn, and about 50 ~ 60% in winter. The value may vary depending on variables such as season (temperature).

The forced drainage amount B can be obtained from the above formulas (3) and (4).

...................................(7)

. ..................... (7)

The replenishment quantity M can be obtained by the formulas (3) and (4) above (8) and (9).

.......................................(8)

.......................................(8)

.......................................(9)

....................... (9)

As mentioned above, according to the basic formula for calculating the evaporation loss amount, the supply amount, and the forced drainage, the total required supply amount for the air conditioning cooling tower is about 1.24% for the open type, and about 1.19% for the closed type. However, the overall cooling water loss is variable when the air temperature fluctuates. Actually, the deflection loss and leakage loss can be about 1.8 ~ 2.0% of the cooling water circulation, and the eliminator excludes the circular cooling tower. In some cases, the supply can be further increased.

Next, the main types of pollution disturbances and water quality management methods in the cooling water circulation system are as follows.

1. Corrosion obstacles: During the corrosion process in which metals react chemically or electrochemically with materials around them, causing damage or decay of the metal surface tissue, the products are soluble or not depending on the surrounding materials in contact with the metal. Non-soluble corrosion products may be deposited or flowed at or near the point of corrosion, and may be deposited at a very distant location. Heat exchangers (condensers, etc.) used for copper and copper alloys, as well as corrosion of piping of cooling water circulation systems, etc. Causes local corrosion.

2. Scale disturbance: A material that forms or deposits a protective film on the metal surface (condenser and piping) due to various insoluble substances generated during heating or evaporation. The formation of scale prevents corrosion of the metal surface. On the other hand, it decreases the heat exchange efficiency of the heat exchanger and increases the resistance of the cooling water flow in the tube, thereby increasing the capacity and consumption power of the freezer. Due to concentration of cooling water (increase of calcium hardness and M alkalinity), increase in concentration of carbonate ions due to pH rise, and decrease of solubility of calcium carbonate due to rise in water temperature, precipitation of calcium carbonate in cooling water causes solidification to scale in the heat exchanger. .

3. Slime and Algae Disorders: Slime is a microorganism that lives in cooling water and produces pollutants. It is fed by air and aquatic nutrients (nitrogen-containing fibrous material) in the cooling water system. Microorganisms, such as algae and yeast, are mixed with foreign substances such as soil and dust, and are soft pollutants, which cause local corrosion in the cooling water circulation system, increase flow resistance of the cooling water, and decrease the heat transfer efficiency of the heat exchanger.

In order to solve the above obstacles;

① maintain the water quality to meet the water quality standard (periodical water quality inspection and proper concentration drainage),

② In general, chemical treatment is performed to prevent contaminants from forming in the cooling water circulation system.

As described above, a predetermined amount of forced drainage is essential in order to maintain water quality that inhibits obstacles caused by water pollution in the cooling water circulation system.

Conventional forced drainage performed to maintain proper cooling water quality can be selected from one of the following methods.

① Open the drain valve so that a certain amount of contaminated coolant is continuously drained during operation.

② Raise the operation level of the sump so that a certain amount of contaminated coolant is continuously drained through the overflow pipe.

③ Regularly replaces the cooling water in the cooling water circulation system with fresh water as well as cleaning the water tank.

However, in the conventional forced drainage method, even if the concentration of the cooling water is eased by the execution of the forced drainage, the forced drainage may be continuously drained without causing the driver to control, resulting in water loss, and the manual opening and closing of the drain valve, Due to the complexity of the water level control operation of the sump tank for natural forced drainage, there is a problem that the cooling tower can not be operated when replacing the contaminated residence coolant of the cooling water circulation system with fresh feed water.

In addition, by supplying cooling water loss (evaporation loss, scattering loss, deflection loss, leakage loss, etc.) and cooling water replenishment according to forced drainage on the surface of the body in the sump, some of the more clean and cold supply water in the forced water drainage system is By diverting through the drain valve or overflow pipe of the sump, it is not only possible to utilize some of the cool energy stored in the supply water, but also to reduce the amount of supply water corresponding to the bypass forced drainage and to reduce the enrichment efficiency, There is a problem involving energy loss.

Next, with reference to the accompanying drawings, a conventional water supply and forced drainage system of the cooling tower will be described.

FIG. 6 is a schematic configuration diagram of a replenishment water and forced drainage unit of the conventional cooling tower, and FIG. 7 is a schematic balance diagram of the replenishment water, forced drainage, and cooling water of FIG. 6. As shown in these figures, the cooling tower 100 constituting the conventional make-up water and the forced drainage part comprises: a casing 111 forming a heat exchange area; An air supply port 112 for introducing air supply into the heat exchange area; A louver 113 provided adjacent to the air supply port 112 and guiding the air supply and restraining coolant droplets which are separated outwardly and guided into the heat exchange area; An exhaust port 114 formed at an upper end of the casing 111 in communication with the heat exchange area; A cooling heat exchanger (115) disposed in the heat exchange area to exchange heat with the cooling water and air; It is disposed in the upper region of the cooling heat exchange unit 115, the spraying unit 116 to spray the cooling water flowing through the cooling water inlet pipe 126 toward the cooling heat exchange unit 115 by the operation of the cooling water pump 170. )Wow; A cooling fan part 120 which passes through the cooling heat exchange part 115 and exhausts the saturated humid air after the heat exchange through the exhaust port 114; An eliminator (118) for recovering water droplets scattered toward the exhaust port (114); The cooling water outlet 121 and the drain pipe 129 which collect the cooling water falling through the cooling heat exchanger 115 and are connected to the cooling water outlet pipe 125 for supplying the cooling water to the heat exchanger 180 in one region. A water collecting tank 119 composed of a drain port 122 to be connected and an overflow pipe 127 for discharging the retention cooling water exceeding the highest operating water level to the outside is provided.

In addition, the supply water is blocked and supplied into the water collection tank 119 according to the water level of the water collection tank 119, and a supply water inlet pipe 132 is connected to one side and is opened and closed by buoyancy of the float. ) And a replenishment water and a forced drainage part 130 formed of a drain valve 128 provided at a drain pipe 129 connected to the drain port 129 of the water collecting tank 119.

Here, unlike the configuration of the replenishment and forced drainage unit 130, a water quality detector (not shown), an electrically operated replenishment water control valve (not shown) that is opened and closed by low and high water level detection signals of the water quality detector, The water quality detector 145 which detects the quality of the cooling water in the sump and the forced drainage are opened and closed according to the set high and low concentration detection signals of the water quality detector 145, and installed in the drain pipe 129 of the sump 119. It is also possible to configure the electrically controlled replenishment water and forced drainage consisting of the forced drainage control valve 140.

The operation of the replenishment water and forced drainage will be described with reference to FIG. 7. Prior to the description, in order to quantify each flow rate, the present description refers to an air conditioning cooling tower having a capacity of 1,000 CRT.

First, the cooling water loss amount (evaporation and scattering loss, etc.), forced drainage, and the supply water amount are varied from fluctuations in the outside temperature, load rate, cooling heat amount, cooling water inlet / outlet temperature, replenishment water condition, etc. Supply amount based on 1,000CRT (3,900,000 Kcal / hr) cooling tower for 1,000RT (3,024,000 Kcal / hr) refrigerator applying temperature (27 ℃), cooling water inlet temperature (37 ℃), cooling water outlet temperature (32 ℃) (Cooled water loss and forced drainage) are assumed to be 2% of the cooling water circulating water, which is normally applied stably, the concentrated drainage is 4, and the forced drainage according to the concentrated drainage 4 is 8,000ℓ / hr (8ℓ / hr.RT x 1,000 ), And the cooling water loss (evaporation and scattering loss, etc.) is assumed to be 7,600 l / hr (supply water-forced drainage).

As shown in the figure, the high temperature ④ cooling water (780,000 liter / hr-37 ° C.) introduced from the heat exchanger 180 through the cooling water inlet pipe 126 is ⑤ lost (a predetermined amount of cooling water by the action of the cooling tower). 7,600ℓ / hr), and, the cooling water of a predetermined amount (8,000ℓ / hr), pursuant to the concentration drain 4 by the opening of the drain valve (138) ⓑ is forced drainage.

⑤ Residual water level in the collection tank 19 is lowered by the lost cooling water (7,600ℓ / hr) and ⓑ forced drainage (8,000ℓ / hr), and at the same time, the feedwater control valve 131 of the feedwater unit 130 is opened to provide a predetermined amount. ② A supply amount of water (15,600 l / hr-15 ° C.) is supplied on the retention water surface of the water collecting tank 119, cooled from the cooling heat exchanger 115, and collected into the water collecting tank 119. ① Cooling water (772,400 L / hr − ℃ 32) and the water tank 119, the cooling water of the low-temperature ③ mixed in the (788,000ℓ / hr -31.66 ℃) is any portion of the cooling water (8,000ℓ / hr-31.66 ℃) through the drain valve 128 is forced drainage ⓑ The remaining ④ cooling water (780,000ℓ / hr-31.66 ℃) absorbs the heat exchange heat through the cooling water outlet pipe 125 and the heat exchanger 180 to become a high temperature cooling water (780,000ℓ / hr-37 ℃). The cooling water inlet pipe 126 is recycled to the cooling tower 100, and the above cooling water loss, forced drainage and supply of the replenishment water are repeatedly It becomes.

As described above, the conventional replenishment water and the forced drainage unit 130 supply the replenishment water ② into the collection tank 119, and the cooling water (32 ° C) cooled in the collection tank 119 and the replenishment water having a lower temperature ( the 15 ℃) with a mixture of cooling water of a lower temperature than the predetermined amount (31.66 ℃) through the drain valve 128 of the water tank 119 to the outside ⓑ is a fundamental to force drainage.

By the configuration and operation of the prior art as described above, supplying the total amount of the feed water into the sump, and the cooling water cooled in the sump and the predetermined amount of cooler with a relatively low temperature and relatively relaxed concentration mixed with the cooler and cleaner feed water Cold discharge energy (8,000 x (37-31.66) = 42,720 Kcal /) held by the forced drainage cooling water (8,000ℓ / hr-31.66 ℃) by forced drainage (8,000ℓ / hr-31.66 ℃) to the outside through the sump valve of the sump. hr) is lost as it is, and the concentration relaxation efficiency of the cooling water circulation system corresponding to the forced drainage is obtained by forcibly bypassing the cooling water (8,000 l / hr), which is more concentrated, without passing through the cooling water circulation system, even if the experimental value is not intervened. Deterioration and cooling water loss may occur.

In addition, according to the structure of supplying the replenishing water into the retention water surface in the sump, water droplets are generated due to friction between the replenishment water supplied by the hydraulic pressure and the retention water surface in the sump, as well as waves are generated on the water surface, causing the float to shake unnecessarily. In other words, the opening and closing may be incorrect, or the detection point of the water quality detector may be incorrect.

In addition, as part of saving water (water resources), high-efficiency eliminators and cooling water treatment (chemical input, ozone sterilization, filtration, etc.) technologies have been developed in the cooling tower industry to reduce the amount of forced drainage. In order to reduce the efficiency of the eliminator, the flow resistance of the air is increased (the cooling fan consumption power is increased), and the cooling water treatment device increases the additional equipment cost and maintenance cost, and there is a limit to the treatment of all pollutants containing the cooling water.

In addition, although the conventional water supply and forced drainage developed at the beginning of the 19th century, when water resources were abundant, have been applied to cooling towers to date, the loss of cold heat energy and the concentration of cooling water possessed by the coolant forcedly drained through the drain valve of the sump are maintained. In spite of the decrease in efficiency and loss of cooling water, the industrial and demand industry considered the cooling tower to be natural, and there was no interest in the loss and efficiency reduction.

Accordingly, the present invention can improve the heat exchange efficiency by using all of the cold heat energy possessed by the replenishing water, improve the saving of the replenishing water and the efficiency of decentralization of the cooling water, and reduce the maintenance cost of the cooling tower. It is to provide a supply water and forced drainage system.

The present invention is to solve the problems of the prior art as described above,

It is an object of the present invention to provide a means for replenishing cooling water loss and for flowing the entire amount of replenishing water supplied at the time of forced drainage of cooling water to the heat exchanger and the cooling water inlet pipe through the cooling water outlet pipe.

Another object of the present invention is to provide a means for discharging a predetermined forced drain for cooling water concentration through any one of the coolant inlet pipe at a position lower than the reservoir level of the sump and the sump of the sump.

Still another object of the present invention is to improve the heat exchange efficiency by using all of the cold heat energy possessed by the replenishment water, to save the replenishment water, to improve the efficiency of concentration relaxation of the cooling water, and to reduce the maintenance cost.

In order to achieve the above object, the present invention, the casing to form a heat exchange region; An air supply port for supplying air supply to the heat exchange area; A louver provided adjacent to the air supply port and guiding the air supply and restraining coolant droplets which escape from the outside; An exhaust port formed at an upper end of the casing to communicate with the heat exchange area; A cooling heat exchanger disposed in the heat exchange area, the cooling water and air flowing through each other and exchanging heat, and configured of any one of an open filler and an enclosed heat transfer coil; A sprinkling part disposed in an upper region of the cooling heat exchange part, and spraying the cooling water flowing through the cooling water inlet pipe by the operation of the cooling water pump toward the cooling heat exchange part; A cooling fan unit configured to exhaust the high-temperature wet air after the heat exchange while passing through the cooling heat exchange unit through the exhaust port; An eliminator for recovering water droplets scattered toward the exhaust port; In the cooling tower having a cooling water outlet for collecting the coolant falling through the cooling heat exchange unit, the cooling water outlet to which the cooling water outlet pipe for supplying the cooling water to the heat exchanger is connected, and the drainage port for connecting the drain pipe is provided,

Supply water is supplied to and shut off the supply water in accordance with the water level of the sump, float valve which is opened and closed by the buoyancy of the float, and the water supply consisting of any one of the electrically operated valve opened and closed by the low and high water level detection signal set by the water level detector A control valve, a feed water inlet pipe connected to one coupling hole of the feed water control valve, and connected between the cooling water outlet pipe and the other coupling hole of the feed water control valve, the cooling water outlet pipe, the heat exchanger, and the cooling water inlet. A supply water supply unit configured to supply a supply water outlet pipe for supplying supply water to the collection tank through a pipe;

A water quality detector installed at one of the collection tank and one of the coolant inlet pipes to detect the quality of the coolant, and a forced drain control valve for opening and closing the forced drainage according to the detection signal of the high and low concentration values set by the water quality detector. And, the cooling water inlet pipe, and any one of the drain port, the forced drainage pipe connected between the one side coupling port of the forced drain control valve, and the forced drain pipe connected to the other coupling port of the forced drain control valve Provides a replenishment water and forced drainage system of the cooling tower, characterized in that it further comprises a forced drainage that is made

Here, the cooling tower may be applied to any one of an intake ventilation cooling tower and a press-fitted cooling cooling tower, and may be applied to other types of cooling towers.

Next, the cooling heat exchange unit may be applied to any one of counter flow and cross flow, and may be applied to other types of cooling heat exchange units, so that the cooling heat exchange unit is not limited to the type.

Next, the sprinkling portion, a pressure watering sprinkling portion consisting of a cooling water distribution pipe, a plurality of distribution pipes, a plurality of spraying nozzles arranged in the distribution pipe, a spraying tank composed of a plurality of spraying nozzles and the spraying tank and It may be applied to any one of the gravity spraying sprinkling portion consisting of a cooling water distribution main body, a plurality of distribution pipes, a diffuser coupled to the lower end of the distribution pipe and evenly discharging the cooling water to the water spray tank.

Next, the cooling fan unit, the axial flow fan, the fan cylinder, the drive belt, the fan driver, the axial flow type cooling fan unit composed of the motor, the centrifugal fan, the fan housing, the drive belt and the motor It can be applied to any one of the centrifugal cooling fan, and can be applied to the direct drive type, not the belt drive type.

Next, the feed water inlet pipe and the feed water outlet pipe connected to the feed water control valve composed of the electrically operated valve, the heat loss prevention through the pipe surface in the summer, the freeze protection in winter, and the It is preferable to be provided between the water supply pipe in the machine room and the cooling water outlet pipe for convenience of operation, but it may be provided between the water supply pipe adjacent to the outdoor cooling tower and the cooling water outlet pipe.

In addition, any one of the feed water inlet pipe and the feed water outlet pipe connected to the feed water control valve composed of the electrically operated valve, if the valve is not closed due to a failure of the supply water control valve or a foreign matter, the sump and cooling water It is preferable to further include a check valve to prevent the contaminated reservoir in the outlet pipe backflow.

The electrically operated valve is preferably a solenoid valve, but can also be applied as an electric valve.

Next, the forced drainage control valve and the forced drainage pipe and the forced drainage pipe connected to the forced drainage control valve are freeze protection during winter, prevention of bottom freezing of the forced drainage, and convenient operation of the forced drainage control valve. It is preferable to be installed in the cooling water inlet pipe in the machine room for the purpose, and to be forced drained through the machine room drain pipe, but if there is a restriction in the indoor installation, the forced drainage pipe connected to one coupling port of the forced drain control valve It can also be installed in the drain of the said sump.

Next, it is preferable that each of the replenishment water control valve and the forced drainage control valve is provided with a screw coupling type or a flange coupling type pipe fitting.

Next, as a means of recycling a part of the highly concentrated (contaminated) cooling water drained through the forced drainage pipe of the forced drainage part to save the loss of the cooling water, a predetermined amount of the cooling water to be forcibly drained between the cooling water outlet pipe and the forced drainage pipe. A water treatment unit for introducing and recycling the water by a predetermined water quality, a forced drainage inlet pipe connected between the forced drain pipe and an inlet of the water treatment unit to introduce a predetermined amount of cooling water to the water treatment unit, and the forced drainage A forced drainage control valve installed in the inlet pipe to adjust the forced drainage inlet; a forced drainage discharge control valve installed in the forced drainage pipe to adjust the forced drainage in proportion to the inflow amount introduced into the forced drainage inlet; Connected between the coolant outlet pipe and the outlet of the water treatment unit Group may be cooling water outlet pipe or water cooling water outlet to be supplied to the bottom of the water tank pipe and, provided by further comprising a forced drainage recycling consisting station disasters, which is installed to prevent the cooling water back flow through to the water coolant outlet pipe.

The water treatment unit may include a filter type water treatment unit for filtering contaminants of the cooling water, and a chemical dosing type water treatment unit for removing and mitigating the contaminants of the cooling water by chemicals. The water treatment unit of the prior art can be selectively employed.

Next, it is preferable that the replenishment water supply unit and the forced drainage unit further include a control unit.

Here, the control unit, according to the operation (on / off) signal of the power switch of the cooling water pump, the supply water control valve and the water level detector consisting of the electrically operated valve, the power of the forced drainage control valve and the water quality detector It is desirable to switch on / off.

Then, according to the ON signal of the power switch of the cooling water pump, the supply water control valve and the water level detector consisting of the electrically operated valve, and the power of the forced drain control valve and the water quality detector are switched on. At the time, the replenishment water control valve and the water level detector consisting of the electrically operated valve, the forced drainage control valve and the water quality detector is in the standby operation state when the power is input, when the low water level detection signal set from the water level detector is inputted When the water control valve is opened to supply the supply water and a high level detection signal is input, the supply water control valve is closed to block supply of the supply water. When the high concentration detection signal set from the water quality detector is input, the forced drain control valve is input. The forced drain control valve is opened when the high concentrated cooling water is drained and the set low concentration value detection signal is input. Is closed, it is preferable to configure the control to be controlled to shut off the drain.

Further, according to the off signal of the power switch of the cooling water pump, the supply water control valve and the water level detector consisting of the electrically operated valve, and the power of the forced drain control valve and the water quality detector are switched off. It is desirable to be controlled.

In addition, the water level detector, it is preferable to apply an electrode-type water level detector, which outputs a set low water level detection signal (supply water supply valve opening signal) and a set high water level detection signal (supply water supply valve closing signal), float type It can also be applied to other types of level detectors.

In addition, the water detector detects any one of chloride (Cl) concentration, calcium carbonate (CaCO3) hardness, and conductivity of the cooling water, which are the targets of the concentrated value of the cooling water flowing in the cooling water circulation system. Preferably, but may also be applied to the concentration value of other contaminants, the water quality detector is preferably installed adjacent to the sump to detect the low water coolant concentration value of the sump, the cooling water inlet tube and the cooling water outflow tube It can also be installed in either pipeline.

A key feature of the present invention is to supply the entire amount of the feed water to the cooling water outlet pipe, the heat exchanger and the cooling water inlet pipe through the cooling water outlet pipe connected between the cooling water outlet port and the heat exchanger, and the cooling water inlet at a position lower than the bottom of the sump tank. The effect of the present invention by the technical configuration of forcibly draining the condensed (contaminated) cooling water through any one of the pipe and the drain of the sump will be described.

First, cooling water loss (evaporation and scattering loss, etc.), forced drainage, and supply water supply vary from the variation of outside temperature, load rate, cooling heat quantity, cooling water inlet and outlet temperature, and feed water conditions of the cooling tower. Based on the 1,000CRT (3,900,000 Kcal / hr) cooling tower for the 1,000RT (3,024,000 Kcal / hr) refrigerator applying temperature (27 ℃), cooling water inlet temperature (37 ℃), and cooling water outlet temperature (32 ℃). (Coolant loss and forced drainage) are assumed to be 2% of the coolant circulation.

here,

T1: Cooling water inlet temperature (37 ℃)

T2: Coolant temperature (32 ℃) through the cooling heat exchange part

T3: Mixing temperature of cooled coolant and make-up water (coolant outlet temperature ℃)

T4: make-up water temperature (15 ° C)

ΔT1: temperature difference (T1-T2) = 37-32 = 5 ° C

ΔT2: temperature difference (T1-T3) = 37-31.66 = 5.44 ° C

QS1: Standard coolant flow rate (780,000ℓ / hr ≒ 13,000ℓ / min)

QS2: Corrected coolant flow (QR3 + QF) = 772,400 + 15,600 = 788,000 ℓ / hr

QR1: Standard coolant inflow amount (780,000ℓ / hr ≒ 13,000ℓ / min)

QR2: Corrected coolant inflow (QS2-BQ) = 788,000-8,000 = 780,000ℓ / hr

QR3: amount of cooled coolant entering the sump (QR2-WS) = 780,000-7,600

     = 772,400 ℓ / hr

QC: Corrected coolant circulation water (H1 / △ T2)

QF: Supply volume (2% of standard coolant inflow)

    (QR1 x 0.02) = 15,600ℓ / hr ≒ 260ℓ / min

N: concentrated drainage (4)

BQ: forced drainage according to concentrated drainage 4 (RT x 8ℓ / hr) =

    1,000 x 8 = 8,000ℓ / hr

WS: Coolant loss (QF-BQ) such as home evaporation and splashing =

    15,600-8,000 = 7,600ℓ / hr

H1: Standard cooling heat (3,900,000 kcal / hr ≒ 1,000 CRT / hr)

H2: When corrected cooling calories,

The mixing temperature (T3) of the cooling water and the replenishment water can be obtained by the following equation (10).

...........(10)

........... (10)

And the correction cooling heat H2 can be calculated | required by following formula (11).

..........(11)

.......... (11)

In addition, according to the temperature of the lowered cooling water, assuming that ΔT2 is 5.34 ° C, the cooling water circulation water quantity QC of the 1,000RT (3,024,000 kcal / hr) refrigerator can be obtained by the following equation (12).

..............(12)

.............. (12)

As described above, by utilizing all the cool energy stored in the replenishment water, the cooling capacity of 79CRT (7.9%) per hour is improved, and corresponding to the lower cooling water outlet temperature (31.66 ° C), the coefficient of performance of the refrigerator (COP: coefficient) of performance) (When the temperature of the coolant is lowered by 1 ℃, the efficiency of the freezer can be improved by about 10%), or when the freezing coefficient of the freezer is left as it is, the amount of cooling water circulation per refrigeration ton (13ℓ / min → 12.17 l / min) can be reduced by 6.4%.

In addition, when the amount of circulating water of the cooling water is reduced, the size of the cooling water pipe and the cooling water circulation pump may be affected.

In addition, even if the experimental value is not intervened, the total amount of the feed water is supplied to the cooling water circulation system through the cooling water outlet pipe connected between the cooling water outlet and the heat exchanger, and the cooling water inlet pipe and the drain port of the collection tank are located at a lower position than the reservoir water level. By forcibly draining the concentrated (contaminated) cooling water through any one of them, the concentrated cooling water circulating in the cooling water circulation system is evenly concentrated and relaxed, thereby improving the concentration and recycling efficiency and saving the amount of replenishment due to the forced drainage.

Then, the feed water is supplied to the cooling water circulation system through the cooling water outlet pipe, so that the noise of friction in the water tank and the float caused by the wave on the water surface are unnecessarily shaken, or the water supply is generated by incorrectly detecting the detection point of the water quality detector. It is possible to eliminate the opening and closing of the valve.

Accordingly, the present invention can improve the heat exchange efficiency by using all of the cold heat energy possessed by the replenishing water, improve the saving of the replenishing water and the efficiency of decentralization of the cooling water, and reduce the maintenance cost of the cooling tower. Supply and forced drainage systems can be provided.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description, the objects, features and advantages of the present invention, and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings, and accordingly, Those skilled in the art will be able to easily practice the present invention. In describing the present invention, a detailed description of the configuration and operation of the known technology that may unnecessarily obscure the subject matter of the present invention will be omitted.

In various embodiments, components having the same configuration will be representatively described in one embodiment by applying the same reference numerals, and other embodiments will be described only in the configuration different from the embodiment.

1 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a first embodiment of the present invention, Figure 2 is a schematic balance diagram of the replenishment water and forced drainage and cooling water of FIG. As shown in these figures, the first embodiment of the present invention, as an example applied to the counterflow type cooling tower, casing (11) forming a heat exchange area; An air supply port 12 for introducing air supply into the heat exchange area; A louver (13) provided adjacent to the air supply port (12), for guiding the air supply and restraining coolant water droplets which are separated from the outside; An exhaust port 14 formed at an upper end of the casing 11 in communication with the heat exchange area; A cooling heat exchanger (15a) disposed in the heat exchange zone, the cooling water and air flowing through each other and heat-exchanging, and composed of an open filler; Pressure spraying sprinkling disposed in the upper region of the cooling heat exchange part 15a, and sprinkling the cooling water flowing through the cooling water inlet pipe 26 by the operation of the cooling water pump 70 toward the cooling heat exchange part 15a. Part 16a; An axial cooling fan part 20a configured to exhaust the high-temperature wet air after the heat exchange while passing through the cooling heat exchange part 15a through the exhaust port; An eliminator (18) for recovering droplets scattered toward the exhaust port (14); Collecting the coolant falling through the cooling heat exchanger (15a), the cooling water outlet 22 is connected to the cooling water outlet pipe 25 for supplying the cooling water to the heat exchanger 80, and the drain pipe is connected to the drain pipe (29) And a cooling tower 10a composed of a water collecting tank 19 having an overflow pipe 27 for discharging the excess residence cooling water to the outside when the highest operational level is exceeded.

Next, as a means for replenishing the cooling water loss and for flowing the entire amount of the feed water supplied during the forced drainage of the cooling water concentration relaxation through the cooling water outlet pipe to the heat exchanger and the cooling water inlet pipe,

Supply water supply valve 31a consisting of a float valve to supply and block the supply water in accordance with the fluctuation of the water collection tank 19, and is opened and closed by the buoyancy of the float, and one side coupling port of the supply water control valve 31a Supply water inlet pipe (32) connected to the (not shown), and the cooling water outlet pipe 25 and the other side coupling port (unsigned) of the supply water control valve 31a is connected to the cooling water outlet pipe (25) and A replenishment water supply unit 30a composed of a heat exchanger 80 and a replenishment water outlet pipe 33 for supplying replenishment water to the sump tank 21 through the coolant inlet pipe 26;

As a means for forcibly draining a predetermined amount of contaminated coolant through the coolant inlet pipe to reduce concentration of the contaminated coolant,

A water quality detector 45 installed in one region of the water collection tank 19 to detect the quality of the cooling water, and a forced drain control valve 41 to open and close the forced water in response to the detection signal of the high and low concentration values set by the water quality detector. ) And the cooling water inlet pipe 26 and one side coupling hole (unsigned) of the forced water control valve 41, the valve 44 for adjusting the flow rate or closing when repairing is forcibly installed The forced drainage part 40 which consists of the drain discharge pipe 42 and the forced drainage pipe 43 connected to the other side coupling opening (unsigned) of the said forced | drainage water discharge control valve 41 is provided.

Here, the supply water control valve (31a) is to apply a float valve as an example, but to replace it, consisting of a supply water control valve and the water level detector consisting of an electrically operated valve disclosed in another embodiment to be described later It may, however, not be bound by the form of its application.

Next, as an additional configuration for controlling the forced drainage unit 40, the forced drain control valve 41 and the water quality detector 45 in accordance with the power switch operation (on / off) signal of the cooling water pump (70). When the power supply is switched on and off and the detection signal of the high concentration value set from the water quality detector 45 is input, the forced drainage control valve 41 must be opened to force drain the contaminated cooling water and set the low concentration value. The control unit 60 is provided to control to shut off the forced drainage by closing the forced drainage control valve 41 when the detection signal is input.

Next, the operation of the replenishment water and forced drainage will be described with reference to FIG. 2. FIG. Prior to the description, in order to quantify each flow rate, the present description refers to an air conditioning cooling tower having a capacity of 1,000 CRT.

Is, of the high temperature flows from the heat exchanger 80 via the cooling water inlet pipe (26), ④ water (780,000ℓ / hr-37 ℃) the cooling water of a predetermined amount by the action of the cooling tower as shown in the figure ⑤ loss ( 7,600 l / hr), and a predetermined ⓑ forced drainage (8,000 l / hr-37 ° C.) according to the concentrated drainage 4 is forcibly opened by the set high concentration value detection signal of the water quality detector 45 of the forced drainage 40. It is discharged to the outside through the drainage control valve, the forced drainage pipe 42 connected to the cooling water inlet pipe 26, and the forced drainage pipe 43.

⑤ Residual water level in the sump 19 is lowered by the lost cooling water (7,600ℓ / hr) and ⓑ forced drainage (8,000ℓ / hr-37 ℃), and at the same time, the open water feed valve 31a of the feedwater portion 30a is opened. And, while a predetermined amount of ② supplemental water (15,600 L / hr-15 ° C.) is supplied through the supplemental water outlet pipe 33 connected to the cooling water outlet pipe 25, it is cooled from the cooling heat exchange part 15a, and the sump tank 19 ) through a cooling water outlet pipe 25 in the cooling water flow ① (772,400ℓ / hr -32 ℃) and the cooling water outlet pipe 25. the cooling water of low temperature ③ mixed in the (788,000ℓ / hr -31.66 ℃) which is a heat exchanger While passing through 80, the heat exchanger absorbs heat and becomes high-temperature cooling water (788,000 l / hr-37 ° C.) and flows back to the cooling water inlet pipe 26 while passing through the forced drain pipe 43 of the forced drainage unit 40. Ⓑ Forced drainage of contaminated cooling water of fixed quantity (8,000ℓ / hr-37 ℃) and supply the remaining high temperature ④ cooling water (780,000ℓ / hr-37 ℃) to the cooling tower, The above cooling water loss, forced drainage and replenishment water supply process are repeated.

Then, the action of the forced drainage is that, when the concentration of the cooling water in the cooling water circulation system is relaxed (low concentration), the forced drain control valve 41 is driven by the low concentration value detection signal of the water quality detector 45 of the forced drainage unit 40. When the water is closed and the forced drainage is stopped and the concentration is enhanced (high concentration), the forced drainage control valve 41 is opened by the set high concentration value detection signal of the water quality detector 45, and the operation of forced drainage is repeated.

However, the detection of the low concentration value set by the water quality detector 45 occurs temporarily when the air is clean due to the rainy season or the like to reduce the inflow of air pollutants, and when the water pollution is low due to the replacement of the total amount of the retention coolant in the cooling water circulation system. Can be.

By the technical configuration and the operation of the first embodiment as described above, it is possible to improve the heat exchange efficiency by using all of the cold heat energy possessed by the replenishment water, to save the replenishment water and to improve the concentration relaxation efficiency of the cooling water, maintenance It is possible to provide a cooling tower make-up and forced drainage system that can reduce maintenance costs.

3 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a second embodiment of the present invention. As shown in the figure, unlike the first embodiment described above, the second embodiment of the present invention is an example that is applied to the press-fit ventilation type open cooling tower 10b, and constitutes the centrifugal cooling fan unit 20. Doing.

Next, the water level detector 35, the feed water control valve 31b which is opened and closed by the low and high water level detection signals set from the water level detector 35, and one coupling hole of the feed water control valve 31b. A water supply inlet pipe 32 connected to and preventing a reverse flow is installed between the cooling water outlet pipe 25 and the other coupling port of the cooling water outlet pipe 25 and the supply water control valve 31b. ), A water supply unit 30b composed of a heat exchanger 80, a supply water outlet pipe 33 for supplying supply water to the water collection tank 19 through the cooling water inlet pipe 26, and the forced drainage described above. The part 40 is provided.

Next, as an additional configuration for controlling the replenishment water supply unit 30b and the forced drainage unit 40, the forced water control valve 41 according to a power switch on / off signal of the cooling water pump 70. ) And the power of the water quality detector 45 are switched on / off, and when the low water level detection signal set from the water level detector 45 is input, the feed water control valve 31b is opened to supply feed water, When the set high water level detection signal is input, the replenishment water supply control valve 31b is closed to block the replenishment water supply. When the detection signal of the high concentration value set from the water quality detector 45 is input, the forced drainage control valve 41 is closed. When the open and contaminated cooling water is forcibly drained, and the detection signal of the set low concentration value is input, the control unit 60 is provided to control the forced drainage control valve 41 to close the drainage.

Next, since the operation of the replenishment water and the forced drainage is equivalent to that of the first embodiment, the description thereof will be omitted.

4 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a third embodiment of the present invention. As shown in the drawings, the third embodiment of the present invention, unlike the above-described embodiment, is an example of application to a cross-flow open cooling tower, and includes a cross-flow cooling heat exchanger 15b and a gravity sprinkling water spraying unit. The cooling tower 10c which has 16b and the diffuser 17 which distributes cooling water evenly is provided.

Next, since the replenishment water supply portion 30b and the forced drainage portion 40 formed in the cooling tower 10c have the same configuration as the second embodiment, the description thereof will be omitted.

Next, since the operation of the replenishment water and the forced drainage is equivalent to that of the first embodiment, the description thereof will be omitted.

5 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a fourth embodiment of the present invention. As shown in the figure, the fourth embodiment of the present invention, unlike the above-described embodiment, is an example to be applied to a counter-flow sealed cooling tower, and includes a cooling heat exchanger 15c and a cooling water outlet formed of a sealed heat transfer tube. A drain 22 'configured to penetrate the bottom of one region of the sump 19 spaced apart from the 21 by a predetermined distance, the cooling water pump 70, and one side coupling hole of the cooling water pump 70 (not shown). And a coolant outlet pipe 25 connecting between the coolant outlet 21 and a coolant inlet pipe 26 connecting the other coupling port (not shown) of the cooling water pump 70 and the water sprayer 16a. The cooling tower 10d which has is provided.

Next, since the replenishment water supply portion 30b and the forced drainage portion 40 constituted in the cooling tower 10d are the same as those of the second embodiment, the description thereof will be omitted.

Next, as an additional configuration for introducing a predetermined amount of contaminated cooling water to be forcibly drained by water treatment to a predetermined water quality,

Forced drainage inlet pipe connected between the water treatment unit 51 and the forced drainage pipe 43 and the inlet (not shown) of the water treatment unit 51 to introduce a predetermined amount of cooling water to the water treatment unit 51 ( 52), a forced drainage inlet control valve 53 installed in the forced drainage inlet pipe 52 to regulate a predetermined forced drainage inflow amount, and provided in the forced drainage pipe 43; The forced water discharge control valve 54 for adjusting the discharge amount of the forced discharge in proportion to the inflow amount to the inlet and the outlet of the cooling water outlet pipe 25 and the water treatment unit 51 connected to the water discharged (not shown) Forced water recycling section consisting of a water treatment cooling water outlet pipe 55 to be supplied to the cooling water outlet pipe 25 and a reverse valve 56 installed to prevent the cooling water from flowing back through the water treatment cooling water outlet pipe 55. To include more 50 have.

Next, since the operation of the replenishment water and the forced drainage is equivalent to that of the first embodiment, the description thereof will be omitted.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can easily modify the present invention without departing from the spirit or essential features thereof. It will be appreciated that it can be implemented.

Therefore, the above-described embodiments should not be limited only to the technical configuration and operation specified by the embodiments, but should be understood in view of illustrating the preferred embodiments of the present invention, and therefore, the scope of the present invention should be described in the claims. It will be limited only by the present invention, and all modifications within the equivalent range and differences obtained from the modifications should be interpreted as being included in the present invention.

The replenishment water and forced drainage system of the cooling tower according to the present invention can improve the heat exchange efficiency by using all of the cold heat energy possessed by the replenishment water, and can reduce the replenishment water and improve the efficiency of enrichment of the cooling water, and maintenance There is an industrial advantage to reduce costs, and its use is easy.

1 is a schematic configuration diagram of a replenishment water and forced drainage system of the cooling tower according to the first embodiment of the present invention,

FIG. 2 is a schematic balance diagram of the supplementary water, forced drainage, and cooling water of FIG. 1;

3 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a second embodiment of the present invention,

4 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a third embodiment of the present invention,

5 is a schematic configuration diagram of a replenishment water and forced drainage system of a cooling tower according to a fourth embodiment of the present invention,

6 is a schematic configuration diagram of a replenishment water and forced drainage of the conventional cooling tower,

FIG. 7 is a schematic balance diagram of the make-up water, forced drainage water, and cooling water of FIG. 6.

<Code Description of Main Parts of Drawing>

10a, 10b, 10c, 10d, 100: cooling tower 11, 111: casing

12, 112: air supply 13, 113: louver

14, 114: exhaust port 15a, 15b, 15c, 115: cooling heat exchange part

16a, 16b, 116: watering part 17: diffuser

18, 118: eliminator 19, 119: sump tank

20a, 20b, 120: cooling fan 21, 121: cooling water outlet

22, 22 '122: drain 25, 125: cooling water outflow pipe

26, 126: cooling water inlet pipe 27, 127: overflow pipe

28, 128: drain valve 29, 29, 129: drain pipe

30a, 30b, 130: replenishment water portion 31a, 31b, 131: replenishment water control valve

32, 132: supply inlet pipe 33: supply water outflow pipe

34, 55: reverse displacement 35: water level detector

40, (140): forced drain 41: forced drain control valve

42: forced drainage pipe 43: forced drainage pipe

44, 53, 54: valve 45, (145): water quality detector

50: forced drainage recycling section 51: water treatment unit

52: forced drainage inlet pipe 55: water treatment cooling water outlet

60: control unit 70, 170: cooling water pump

80, 180: heat exchanger 130: replenishment and forced drainage

Claims (3)

A casing forming a heat exchange region; An air supply port for supplying air supply to the heat exchange area; A louver provided adjacent to the air supply port and guiding the air supply and restraining coolant droplets which escape from the outside; An exhaust port formed at an upper end of the casing to communicate with the heat exchange area; A cooling heat exchanger disposed in the heat exchange area, the cooling water and air flowing through each other and exchanging heat, and configured of any one of an open filler and an enclosed heat transfer coil; A sprinkling part disposed in an upper region of the cooling heat exchange part, and spraying the cooling water flowing through the cooling water inlet pipe by the operation of the cooling water pump toward the cooling heat exchange part; A cooling fan unit configured to exhaust the high-temperature wet air after the heat exchange while passing through the cooling heat exchange unit through the exhaust port; An eliminator for recovering water droplets scattered toward the exhaust port; In the cooling tower having a cooling water outlet for collecting the coolant falling through the cooling heat exchange unit, the cooling water outlet is connected to the cooling water outlet pipe for supplying the cooling water to the heat exchanger, and the drainage tank is connected to the drain pipe, Supply water is supplied to and shut off the supply water in accordance with the water level of the sump, float valve which is opened and closed by the buoyancy of the float, and the water supply consisting of any one of the electrically operated valve opened and closed by the low and high water level detection signal set by the water level detector A control valve, a feed water inlet pipe connected to one coupling hole of the feed water control valve, and connected between the cooling water outlet pipe and the other coupling hole of the feed water control valve, the coolant outlet pipe, a heat exchanger, and the coolant inlet A supply water supply unit configured to supply a supply water outlet pipe for supplying supply water to the collection tank through a pipe; A water quality detector installed at one of the collection tank and one of the coolant inlet pipes to detect the quality of the coolant, and a forced drain control valve for opening and closing the forced drainage according to the detection signal of the high and low concentration values set by the water quality detector. And a forced drain pipe connected between the cooling water inlet pipe, any one of the drain ports, and one coupling port of the forced drain control valve, and a forced drain pipe connected to the other coupling port of the forced drain control valve. Complementary water and forced drainage system of the cooling tower, characterized in that further comprises a forced drainage configured. The method of claim 1, Between the cooling water outlet pipe and the forced drainage pipe, a water treatment unit for introducing a predetermined amount of the cooling water to be forcibly drained and water treatment to recycle the predetermined water quality, and the cooling water connected to the forced water pipe and the inlet of the water treatment unit for forced drainage A forced drainage inlet pipe for introducing a predetermined amount into the water treatment unit, a forced drainage inlet valve installed in the forced drainage inlet pipe to regulate a predetermined forced drainage flow rate, and installed in the forced drainage pipe to regulate the amount of forced drainage discharged. Comprising a forced drainage discharge control valve, and the forced drainage recycling section consisting of a water treatment cooling water outlet pipe is connected between the cooling water outlet pipe and the outlet of the water treatment unit to supply the treated water to the cooling water outlet pipe. Cooling water supply and forced drainage system. The method of claim 1, The replenishment water supply unit and the forced drainage unit are provided with a supply water control valve and a water level detector consisting of the electrically operated valve, and a power supply of the forced drainage control valve and the water quality detector according to an on / off signal of the cooling water pump. When the low water level detection signal is input from the water level detector and the low water level detection signal is input, the water supply valve is opened to supply the water supply, and when the high water level detection signal is input, the water supply valve is closed to supply water. When the high concentration value detection signal is input from the water quality detector, the forced drainage control valve is opened to forcibly drain the contaminated cooling water, and when the detection signal for the low concentration value is input, the forced drainage control valve Replenishment water and steel of the cooling tower, characterized in that further comprises a control unit for controlling to close the forced drainage by closing Drainage system.

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