JPH03247991A - Sealed type cooling tower - Google Patents

Abstract

PURPOSE:To make a spray water tank unnecessary and compact the whole of a sealed type cooling tower by a method wherein spray water is detected by a spray water detecting sensor provided at the downstream outlet port of spray water of a heat exchanger while the amount of the spray water is controlled by the detecting signal of the sensor. CONSTITUTION:A spray water detecting sensor 14, detecting the existence of spray water, is provided at the downstream outlet port of the spray water below a heat exchanger 2 and the amount of spray water is controlled by regulating the opening degree of a flow rate control valve 15 so that the spray water is not detected by the spray water detecting sensor 14 or the spray water will not arrive at the downstream outlet port of spray water below the heat exchanger 2. On the other hand, the title cooling tower is constituted so that the amount of spray water, which flows through the cooling tower, is more than the amount of spray water evaporated in the heat exchanger 2 while the spray water, not evaporated in the cooling tower, is retained in a spray water retaining unit 19 arranged below the heat exchanger 2. The spray water, reserved in the spray water retaining unit 19, is elevated into the heat exchanger 2 by capillary phenomenon and all of the spray water is evaporated finally.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a heat exchanger in which a cooling fluid flows in the pipes,
The present invention relates to a closed type cooling tower having a structure in which water is sprayed from a water sprinkler on the heat transfer surface of the heat exchanger and the cooling fluid is cooled by the heat of vaporization of the water.

[Conventional technology]

Conventionally, open cooling towers have been used for heat radiation in compression refrigeration equipment and absorption refrigeration equipment.

However, in open-type cooling towers, harmful substances such as sulfur dioxide gas, microorganisms, and dust in the atmosphere mix into the cooling water, causing corrosion, scale, slime, etc. to occur in the piping and equipment. Ta.

For this reason, in recent years, the open type cooling tower has been replaced by a closed type.

According to this closed type cooling tower, the cooling water system is completely sealed and does not come into direct contact with the air, which not only protects equipment and piping, but also saves labor in maintenance and management, and uses cooling fluids other than water. can do.

FIG. 4 is a diagram showing a schematic configuration of this type of closed cooling tower.

In the figure, cooling water is sent into the cooling tower from a pipe 1, is cooled while passing through a heat exchanger 2, and is supplied to a load through a pipe 3.

On the other hand, the spray water is sent from the spray water tank 4 to the water sprinkler 7 by the pump 5 and piping 6, and is sprayed on the surface of the heat exchanger 2.

When the sprayed water falls on the surface of the heat exchanger 2, it cools the cooling water inside the heat exchanger 2 and is heated itself.

In addition, air is sucked in from the louver 9 by the blower 8,
It passes through the heat exchanger 2 and is discharged from the cylinder 10 to the outside. This air evaporates and cools the sparge water in two parts of the heat exchanger.

That is, the sprayed water is simultaneously heated and cooled by the heat exchanger 2. As a result, the temperature of the sprayed water in the sprinkler device 7 and the temperature of the sprayed water in the sprayed water tank 4 become approximately equal.

By the way, since the spray water evaporates to cool itself, the amount of spray water in the spray water tank 4 gradually decreases.

For this reason, normally tap water piping 11 is connected to this spray water tank 4.
The water level of the spray water in the spray water tank 4 can be kept constant by connecting the spray water tank 4 and using the pole tap 12 or the like.

Further, an eliminator 13 is attached to the upper part of the water sprinkler 7 to prevent the sprayed water from being scattered by the air.

[Problem to be solved by the invention]

However, in this type of conventional closed cooling tower,
Compared to conventional open-type cooling towers, heat can be exchanged indirectly with the air, so there was a problem in that the volume of the tower body became larger.

In addition, there was a problem in that a spray water pipe 6 and a pump 5 were additionally required in addition to the cooling water pipe and the tap water pipe.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to eliminate the above-mentioned conventional problems and provide a closed cooling tower which is extremely compact and eliminates the need for pipes and pumps for spraying water.

[Means to solve the problem]

In order to solve the above problems, the present invention includes a heat exchanger 2 through which a cooling fluid flows in the piping, and sprays water from a water sprinkler 7 onto the heat transfer surface of the heat exchanger 2. In a closed type cooling tower that cools the cooling fluid using heat of vaporization, a spray water detection sensor 14 is provided at the downstream outlet of the spray water sprayed on the heat exchanger 2 to detect the presence or absence of the spray water. A control means, for example, a flow rate control valve 15, is provided to control the amount of water to be sprayed from the sprinkler device 7 in response to a detection signal from the water detection sensor 14 so that all of the water is evaporated.

[Effect]

By configuring a closed cooling tower as described above, all of the sprayed water is vaporized, so there is no need to separately install spray water piping and tap water piping as in the past, and the sprinkler system can be used with tap water. Can be connected directly to piping. Therefore, conventional piping and pumps for watering are no longer necessary.

In addition, the spray water detection sensor installed at the downstream outlet of the spray water in the heat exchanger detects the spray water, and the amount of spray water is controlled based on the detection signal, eliminating the need for a conventional spray water tank and allowing closed cooling. The entire tower can be made very compact.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing a schematic configuration of a closed cooling tower according to an embodiment of the present invention.

As shown in the figure, unlike the conventional example described above, in this closed type cooling tower, a spray water detection sensor 14 is provided at the lower part of the heat exchanger 2 to detect the presence or absence of spray water. A flow rate control valve 15 is provided to adjust the amount of sprayed water from the sprinkler device 7 based on a signal from the sprayer 7, and the conventional sprayed water tank 4 and pump 5 are omitted.

The overall configuration of this closed type cooling tower will be explained below.

Cooling water is sent into the cooling tower through a pipe 1, cooled while passing through a heat exchanger 2, and supplied to the load through a pipe 3.

On the other hand, the pipe 11 is directly connected to a pipe for tap water.

Then, the sprayed water is sent from the pipe 11 through the flow control valve 15 to the water sprinkler 7, and is sprayed onto the surface of the heat exchanger 2 from the water sprinkler 7.

When this sprayed water falls on the surface of the heat exchanger 2, it cools the cooling water passing through the heat exchanger 2, and is able to heat itself.

Further, air is forcibly drawn into the cooling tower from the looper 9 by the blower 8, sucked upward through the heat exchanger 2, and discharged to the outside from the cylinder 10. This air cools the spray water as it passes through the heat exchanger 2;
Evaporate.

Note that the amount of water sprayed from the water sprinkler 7 is controlled so that it is all vaporized within the heat exchanger 2.

That is, in this embodiment, a spray water detection sensor 14 for detecting the presence or absence of the spray water is provided at the downstream outlet of the spray water at the lower part of the heat exchanger 2, and so that the spray water is not detected by the spray water detection sensor 14. That is, the amount of sprayed water is controlled by adjusting the opening degree of the flow rate control valve 15 so that the sprayed water does not reach the downstream outlet of the sprayed water at the lower part of the heat exchanger 2.

In the embodiment shown in FIG. 1, the spray water detection sensor 14 is provided at the downstream outlet of the spray water at the bottom of the heat exchanger 2, and is configured to detect the presence or absence of the spray water itself. In addition, any detection sensor may be used as long as it can detect physical quantities that can be used to control the amount of sprayed water, such as the dry bulb temperature, wet bulb temperature, and humidity of the outside air. Of course, the same effect can be achieved.

In addition, the amount of sprayed water can be controlled so that the sprayed water cannot be detected at the downstream outlet of the lower part of the heat exchanger 2. If the surface is treated with a water-absorbing resin or the like so that water can be retained, the sprayed water may be controlled intermittently, and the same effect can be achieved in this case as well.

In addition, in the case of tap water that contains many impurities, there is a possibility that the impurities will precipitate on the surface of the heat exchanger 2, so it is better to remove the impurities from the tap water with a filter or membrane in advance and use this as spray water. good.

By the way, in the embodiment shown in FIG. 1, the amount of sprayed water is controlled so that the sprayed water cannot be detected at the downstream outlet of the sprayed water at the bottom of the heat exchanger 2. In some cases, it may be difficult to spread the heat exchanger 2 evenly over the entire surface of the heat exchanger 2, and it is also possible that a portion of the surface of the heat exchanger 2 becomes dry and the heat transfer performance of the heat exchanger 2 deteriorates.

FIG. 2 shows an embodiment for solving this drawback.

In this embodiment, unlike the embodiment shown in FIG.
The sprayed water is configured to flow in an amount greater than the amount that is vaporized within the heat exchanger 2, and the sprayed water that has not been completely vaporized is configured to accumulate in the sprayed water holding portion 19 disposed below the heat exchanger 2.

Here, the spray water detection sensor 14 is attached to the spray water holding section 19, and detects the spray water when a predetermined amount of the spray water has accumulated in the spray water holding section 19.

Further, a water absorbing member 16 made of a substance exhibiting capillary action is connected between the spray water holding section 19 and the heat exchanger 2. Therefore, the spray water accumulated in the spray water holding section 19 goes up to the heat exchanger 2 by capillary action, and eventually all the spray water is vaporized.

Furthermore, as another method, the water absorbing member 1 shown in FIG.
Instead of installing solenoid valve 1, as shown in the figure,
8 may be connected between the spray water holding section 19 and the pipe 11.

Note that FIG. 3 is a diagram showing details of the connecting portion between the pipe 17 and the pipe 11. As shown in the figure, the connecting portion between the piping 17 and the piping 11 is a venturi tube. When the spray water accumulates up to a predetermined water level in the spray water holding section 19 shown in FIG.
In addition, a signal is also sent to the solenoid valve 18 to open it. As a result, the spray water in the spray water holding section 19 is guided to the pipe 11 by the action of the Venturi pipe, and the water spray device 7
Since the sprayed water is then sprayed again into the heat exchanger 2, all of the sprayed water is eventually vaporized.

In the two embodiments shown in FIG. 2, the spray water is sufficiently sprayed onto the heat exchanger 2 in both cases, so the surface of the heat exchanger 2 does not dry out and the heat transfer performance is extremely high. Get better.

〔Effect of the invention〕

As described above in detail, the closed cooling tower according to the present invention provides the following excellent effects.

(1) Since all of the sprayed water is vaporized, there is no need to separately install the spray water piping and tap water piping as in the past, and they can be shared. Moreover, the conventional pump for watering is not required.

■Since there is no need to install a spray water tank under the heat exchanger, the equipment can be made very compact.

0) Due to the effect of (υ, (2)) above, the installation work of a closed cooling tower has become extremely easy, and its maintenance management has become easier.

[Brief explanation of drawings]

1 is a diagram showing a schematic configuration of a closed cooling tower according to an embodiment of the present invention, FIG. 2 is a diagram showing a schematic configuration of a closed cooling tower according to another embodiment of the present invention, and FIG. 3 is a diagram showing a schematic configuration of a closed cooling tower according to another embodiment of the present invention. 2 is a diagram showing the details of the connection between the piping 17 and the piping 11 shown in FIG. 2, and FIG. 4 is a diagram showing the schematic structure of a conventional closed type cooling tower. In the figure, 1... Piping, 2... Heat exchanger, 3... Piping, 7... Water sprinkler, 11... Piping, 14... Sprinkling water detection sensor, 15... Flow rate Control valve, 17...Piping, 18...T magnetic piece, 19...Spray water holding section.

Claims (1)

[Claims] A heat exchanger is provided in which a cooling fluid flows in piping, water is sprayed from a water sprinkler on the heat transfer surface of the heat exchanger, and the cooling fluid is cooled by the heat of vaporization of the sprayed water. In the closed type cooling tower, a spray water detection sensor is provided at a downstream outlet of the spray water sprayed on the heat exchanger to detect the presence or absence of the spray water, and the spray water detection sensor detects the presence or absence of the spray water in accordance with the detection signal of the spray water detection sensor. 1. A closed type cooling tower comprising a control means for controlling the amount of sprayed water so that all of the water sprayed from the sprinkler device evaporates.