JPH0674885U - Dry and wet cooling tower - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cooling tower capable of effectively preventing generation of white smoke. [Structure] Wet section 1 and dry section 4 having air heater 5
And a fan 6 provided on the upper deck, and a cold water tank 3 for storing cold water that is cooled by the airflow sucked by the fan 6 and flows down through the filler block, and an opening degree for taking in outside air to the upper deck An adjustable air intake 7 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling tower, and more particularly, a dry air heater is incorporated in a conventional wet cooling tower, air heating and water cooling are performed by a common air blower, and the heated air can reduce white smoke in exhaust air. Regarding a combined cooling tower.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, a wet cooling tower used to cool and circulate hot water discharged from factory equipment, air-conditioning equipment of buildings, etc. has a hot water and cooling airflow from the viewpoint of the hot water cooling method. There is a so-called "counter flow system" in which the flow directions of water are opposite, and a so-called "cross flow system" in which the flow directions of hot water and the air flow are at right angles. It is also applicable to the type. Therefore, in order to facilitate understanding of the present invention, the wet cooling will be briefly described with reference to FIG. 2 by taking a cross-flow type cooling tower as an example.

In FIG. 2, fillers 12 and 12 are installed on both sides of the ventilation space 11, a cooling fan 13 is attached above the ventilation space 11, and a hot water tank 14 is provided above each filler 12. Hot water is supplied to the hot water tank 14 from a hot water supply pipe 15 through a sprinkler box 16.

A sprinkling nozzle 17 is attached to each hot water tank 14, hot water is supplied to the filling material 12 by the sprinkling nozzle 17, and the supplied hot water flows down through the filling material 12. On the other hand, the cooling fan 13 generates a flow F of outside air from the louver 18 on the side of the filler 12 through the filler 12 and into the ventilation space 11, and the air flow F cools the hot water flowing down in the filler 12. . The air after heat exchange with the warm water is separated into water droplets by the eliminator 19 and then discharged to the outside. Thus, the hot water that has passed through the filler 12 becomes cold water and is stored in the cold water tank 20. In this way, in the cross-flow type cooling tower, the warm water that flows down is cooled by the airflow that is supplied from the lateral direction, but in the counter-flow type cooling tower, the warm water that flows down goes from below to above. The other main components of both cooling towers are almost the same except that they are cooled by the air flow.

However, during the cold season or high humidity, the steam in the air discharged by the cooling fan 13 may condense and form white smoke. Therefore, problems such as "obstruction of visibility", "freezing on the ground or buildings" and "misidentification of nighttime fires" have been raised, and a cooling tower that prevents white smoke has been demanded.

The combined dry and wet cooling tower is provided to meet such a requirement, and a dry air heater is incorporated in a conventional wet cooling tower, and air heating and water cooling are performed by a common air blower and heated. It mixes air with humid air to reduce white smoke in the exhaust air. The schematic structure of the dry / wet cooling tower will be described with reference to FIG. In the figure, reference numerals ₁ and ₁ denote opposing wet parts, which are composed of a filler block and hot water supply means, and the internal structure thereof is the same as that of FIG. 2, and the return hot water 2 from the device is the outside air f ₁ . It is cooled by direct contact and stored in the cold water tank 3. Numerals 4 and 4 are dry parts facing each other, and have an air heater 5, in which the outside air f ₂ is indirectly heated by the return hot water 2 from the device. The wet air that has passed through the wet section and the dry air that has passed through the dry section are mixed by the fan 6 and discharged from the top of the tower, so that the cooling diffusion process of the discharged air falls below the saturation curve in the wet air diagram. Mixing moist air with dry air can prevent the generation of white smoke. That is, in FIG. 4, a straight line C-W and a straight line C-D show the state changes of the air in the wet part and the dry part, respectively. As shown in the figure, the wet air at the point W and the dry air at the point D are When the mixture is mixed and is discharged from the tower in the state of point M ₀ , the cooling diffusion process M ₀ -C of the discharged air is below the saturation curve S, so that white smoke is not generated. Or it will be negligible.

However, the dry air heated in the dry section 4 and the moist air passing through the wet section 1 may not always be sufficiently mixed and may be discharged from the tower at a point M _1. In this case, since the cooling diffusion process M ₁ -C of the exhaust air is above the saturation curve S, generation of white smoke is unavoidable.

The present invention has been made in view of the above problems of the conventional technology, and an object thereof is to provide a cooling tower capable of effectively preventing the generation of white smoke. It is in.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the gist of the present invention is to provide a filler block and a wet part comprising hot water supply means for supplying hot water to the filler block, a dry part having an air heater, a filler block and An upper deck in a combined dry-wet cooling tower comprising a fan for sucking air passing through an air heater and a cold water tank for storing cold water cooled by the air flow sucked by the fan and flowing down through the filler block. It is a dry and wet combined cooling tower, which is equipped with an air intake with an adjustable opening to take in outside air.

[0010]

[Action]

 The outside air is taken into the cooling tower by the fan from the air intake port provided in the upper deck, and this outside air mixes the moist air that has passed through the wet section and the dry air that has passed through the dry section, and the air discharged from the tower. Since the relative humidity inside is reduced, the generation of white smoke can be prevented.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. In FIGS. 1 (a) and 1 (b), 7 is an air inlet for taking in outside air, and in this embodiment, 8 places are provided on the upper deck of the tower. The larger the opening of the air intake 7, the larger the amount of outside air taken into the cooling tower, and the greater the white smoke prevention effect. The opening degree of the air intake port 7 may be adjusted according to the outside air temperature, and it is preferable to increase the opening degree in the cold season. In this case, when the capacity of the fan 6 is constant, if the opening degree of the air intake 7 is increased, the amount of air passing through the wet section 1 and the dry section 4 is relatively reduced, and The ability to cool the return hot water is reduced. However, since this cooling capacity is not required so much in the cold season, there is no problem even if the amount of air taken in from the air intake 7 increases.

As a method for adjusting the opening degree of the opening / closing lid 7a of the air intake port 7, for example, a fluid pressure cylinder and the opening / closing lid 7a can be connected and remotely operated from the operator's cab. In this case, it is possible to employ a system in which the opening / closing lid 7a automatically opens and closes depending on the outside air temperature. In this embodiment, eight air intakes 7 are provided, but the number can be increased or decreased as necessary. As a method of taking in outside air into the cooling tower, in addition to providing an air intake port in the upper deck of the tower, an opening is provided on the lower surface of the air heater 5 to increase the amount of air passing through the air heater. You can also

[0013]

[Effect of device]

 The upper deck of the cooling tower according to the present invention has an air intake opening with an adjustable opening to take in outside air. Generation of white smoke can be prevented by mixing the appropriate amount of dry air that has passed through the section by introducing outside air.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing a schematic structure of a dry / wet combined cooling tower according to the present invention, and FIG. 1 (b) is a plan view showing a schematic structure of a dry / wet combined cooling tower according to the present invention.

FIG. 2 is a sectional view of a conventional cooling tower.

FIG. 3 is a perspective view showing a schematic configuration of a conventional dry and wet combined cooling tower.

FIG. 4 is a thermal characteristic diagram of a dry and wet combined cooling tower.

[Explanation of symbols]

 1 ... Wet part 3 ... Cold water tank 4 ... Dry part 5 ... Air heater 6 ... Fan 7 ... Air inlet

Claims (1)

[Scope of utility model registration request] 1. A wet type part comprising a filler block and hot water supply means for supplying hot water to the filler block, a dry type part having an air heater, and sucking air passing through the filler block and the air heater. In a dry-wet combination cooling tower equipped with a fan and a cold water tank that stores the cold water that flows down in the filler block after being cooled by the air flow sucked by the fan, the opening degree for taking in outside air into the tower upper deck can be adjusted A dry and wet cooling tower, which is equipped with a unique air intake.