JP2019045086A - cooling tower - Google Patents

Abstract

To provide a structure of a water spray tank which inhibits deterioration of cooling ability by reduction of clogging of water spray holes of the water spray tank and enables easy cleaning of a water spray tank bottom part.SOLUTION: A cooling tower includes: a water spray tank which stores a coolant; and a filler which is arranged in a downward flow passage of the coolant dropped from the water spray tank. The water spray tank has a bottom part formed by a wave plate in which recessed parts and protruding parts, formed into a wave form, extend in parallel to each other. Multiple water spray holes are provided at the protruding parts.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooling tower for cooling cooling water whose temperature has risen prior to recirculation of cooling water used in circulation.

  For example, in a steelworks, cooling processing is performed in various manufacturing processes, and cooling water used for the cooling processing is usually circulated. When the cooling water is subjected to a cooling process, the temperature rises (naturally), so it is necessary to cool it before recirculation. Therefore, a cooling tower for cooling the cooling water is disposed in the cooling water circulation path. As this type of cooling tower, for example, one having a structure described in Patent Document 1 is well known.

  That is, as shown in FIG. 1 of Patent Document 1, the upper watering tank for temporarily storing the cooling water used in the cooling process at the upper part of the cooling tower structure, and the filling disposed below the watering tank And a lower water tank disposed below the filler. The cooling water stored in the upper watering tank is dropped from the watering holes provided at the bottom of the tank toward the filler, and the cooling water flows down inside the filler. Since the outside air is introduced into the filler via, for example, an impeller, the cooling water is cooled in contact with the outside air in the process of flowing down the inside of the filler.

  In general, the water spray tank of the cooling tower has a flat bottom. In the above-mentioned Patent Document 1, a short pipe portion standing in the water spray tank is added to a part of the water spray hole provided in the flat bottom, and the water spray tank is It is described that the falling flow rate of the cooling water is controlled.

Japanese Utility Model Publication No. 5-12637

  Here, it is inevitable that the cooling water is mixed with various foreign substances (hereinafter collectively referred to as dust) in the cooling process and the circulation process. The mixed dust accumulates on the bottom of the watering tank where the used cooling water is temporarily stored, and gradually closes the watering holes. Then, the total amount of water falling from the sprinkling holes also gradually decreases, and the cooling capacity of the cooling water recirculated from the cooling tower is lowered. Eventually, dust accumulates on the entire bottom surface, and as a result of the clogging of all the sprinkling holes, the circulation of the cooling water is interrupted. Therefore, it is necessary to clean the whole sprinkling tank before such a situation occurs.

  In this respect, the water sprinkling hole to which the above-described short pipe portion is added is located above the short pipe portion, so that blockage by dust can be avoided. However, dust tends to adhere around the short pipe portion on the bottom surface of the sprinkler tank, and it is necessary to clean the bottom of the sprinkler tank as the amount of adhesion increases. At that time, there is a case where dust accumulates around the short pipe portion and adheres, which makes it difficult to clean the bottom surface of the water sprinkling tank.

As described above, when the water spray hole is blocked by dust, the water injection into the filler is reduced, and further, the water injection is interrupted, and the cooling capacity in the cooling tower is reduced or stopped. In order to avoid this situation and restore the operation of the cooling tower, it is necessary to clean the entire surface of the sprinkler tank, which is extremely difficult to clean.
Then, an object of this invention is to provide the structure of the watering tank which can suppress the fall of the cooling capability by clogging of the watering hole of a watering tank, and can clean a watering tank bottom easily.

The present invention has been made to solve the above problems, and the gist of the present invention is as follows.
1. In a cooling tower comprising a watering tank for storing cooling water, and a filler disposed in a flow path for cooling water dropped from the watering tank,
The said watering tank is a cooling tower which has the bottom part of a corrugated sheet in which the recessed part and convex part which are formed in a wave shape extend in parallel, and provide a some watering hole in the said convex part.

2. 2. The cooling tower according to 1 above, wherein a plurality of water spray holes are provided at equal intervals in the convex portion.

3. 3. The cooling tower as described in 1 or 2 above, wherein the wave amplitude in the corrugated plate is 30 mm or more and 50 mm or less.

4). 4. The cooling tower according to any one of 1 to 3, wherein a wave period in the corrugated plate is not less than 4 times and not more than 7 times the amplitude.

5. 5. The cooling tower according to any one of 1 to 4, wherein the watering hole has a diameter of 10 mm or less.

6). 6. The cooling tower according to any one of 1 to 5, wherein an interval between the water spray holes in the longitudinal direction of the convex portion is 10 mm or less.

  According to the present invention, the bottom of the water spray tank of the cooling tower is made into a corrugated plate, and the water spray holes are provided in the convex portions, so that only the supernatant of the cooling water containing a small amount of small dust flows from the water spray holes. By depositing large and heavy dust or sludge that closes the hole in the concave portion of the corrugated plate, the watering hole is prevented from being blocked, so that the cooling capacity of the cooling tower can be maintained for a long time. Further, since dust is deposited in the concave portion of the corrugated plate, cleaning can be performed only in the portion, and since the concave portion is a groove having a continuous curved surface, simple cleaning is sufficient.

It is sectional drawing which shows the cooling tower of this invention. It is sectional drawing which shows the watering tank according to this invention. It is a figure which shows the shape of the bottom part of a watering tank.

Hereinafter, the cooling tower of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the cooling tower 1 includes a watering tank 3 that temporarily stores the cooling water 2 used in the cooling process, and a corrugated packing plate or a sealed-type heat disposed below the watering tank 3. A filler 4 such as an exchanger, a water receiving tank 5 disposed below the filler 4, an impeller 6 that generates an air flow for taking outside air into the filler 4 from the outer surface of the cooling tower 1, A rectifying plate 7 for adjusting the airflow is provided.

  Now, the cooling water 2 that has been used in the cooling treatment process and becomes hot water is dropped from the water spray tank 3 toward the filler 4 and supplied uniformly to the filler 4 at a constant flow rate and cooled in the filler 4. Water 2 is cooled. Here, in order to drop a certain amount from the water spray tank 3 toward the filler 4, it is necessary to provide many water spray holes at the bottom of the water spray tank 3.

  That is, as shown in FIG. 2 for the sprinkler tank 3 according to the present invention, the sprinkler tank 3 includes a corrugated plate bottom portion 30 in which a concave portion 30a and a convex portion 30b formed in a wave shape extend in parallel. A plurality of water spray holes 31 are provided in each of the convex portions 30 b of the bottom portion 30. A fixed amount of cooling water 2 is dropped toward the filler 4 through the water spray holes 31 to supply the filler 4 at a constant flow rate.

  Thus, since the bottom part 30 of the water spray tank 3 has the water spray hole 31 in the convex part 30b which hits a wave peak, the foreign material of the cooling water 2 collected in the water spray tank 3 is small and accepts a small amount of supernatant. Can pass through. On the other hand, the large and heavy dust that closes the sprinkling holes is deposited in the concave portion 30a that hits the wave trough, so that the heavy dust can be prevented from diffusing to the sprinkling hole 31 side. Therefore, since a large and heavy foreign substance is not introduced into the sprinkling hole 31, early blockage due to dust is avoided in advance.

  Moreover, since the recessed part 30a is a groove extending in a shape close to an arc, if the dust accumulated here is carried along the groove (recessed part 30a) to the end of the bottom part 30 at once, the dust is a lump for each recessed part 30a. It is possible to carry and remove as a simple cleaning of the bottom 30 of the water sprinkling tank 3 is realized.

  Here, it is preferable that the wave amplitude α at the bottom 3 shown in FIG. 3A, that is, the shortest distance α between the concave portion 30a and the convex portion 30b is not less than 30 mm and not more than 50 mm. That is, if the amplitude α is less than 30 mm, the amount of dust accumulated in the recess 30a may exceed the volume of the recess 30a in a short time. On the other hand, when the amplitude α exceeds 50 mm, dust tends to concentrate and accumulate near the water outlet (for example, reference numeral 20 in FIG. 1) for supplying the cooling water 2 after use to the water tank 3, and to the entire water tank 3. There is a possibility that the uniform diffusion of the cooling water 2 may be hindered. Then, the flow rate difference of the cooling water 2 occurs between the water spray holes 31, and the water supply to the filler 2 becomes uneven, and there is a possibility that the cooling efficiency is lowered. Furthermore, if the amplitude α exceeds 50 mm, the amount of water that is always stored in the watering tank increases and the circulation efficiency of the cooling water decreases, so α is preferably set to 50 mm or less.

  Similarly, as shown in FIG. 3A, the wave period β at the bottom 3, that is, the inter-vertex distance β of the convex portion 30b (the concave portion 30a) is not less than 4 times and not more than 7 times the amplitude α described above. Is preferred. That is, when the period β is less than four times the amplitude α, it becomes difficult to clean the dust and sludge accumulated in the recesses. On the other hand, when the period β exceeds 7 times the amplitude α, the dust accumulated in the recesses easily enters the water spray holes.

  Moreover, it is preferable to provide the water spray holes 31 at equal intervals on each convex portion 30b. This is because the cooling water can be evenly supplied to the filler, which results in an optimal state of heat exchange efficiency. In particular, the mutual distance d between the water spray holes 31 in the longitudinal direction of the convex portion 30b shown in FIG. 3B is preferably 10 mm or less. This is because when the distance d exceeds 10 mm, a portion where the cooling water is not supplied to the filler is generated, and the heat exchange efficiency is lowered.

  Furthermore, it is desirable that the diameter γ of the watering hole 31 shown in FIG. This is because, when the diameter γ exceeds 10 mm, relatively large dust passes through the water sprinkling holes and adheres to the filler to reduce the heat exchange efficiency.

DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Cooling water 3 Sprinkling tank 4 Filler 5 Water receiving tank 6 Impeller 7 Current plate 30 Bottom part 30a Concave part 30b Convex part 31 Sprinkling hole

Claims (6)

In a cooling tower comprising a watering tank for storing cooling water, and a filler disposed in a flow path for cooling water dropped from the watering tank,
The said watering tank is a cooling tower which has the bottom part of a corrugated sheet in which the recessed part and convex part which are formed in a wave shape extend in parallel, and provide a some watering hole in the said convex part.   The cooling tower according to claim 1, wherein a plurality of water spray holes are provided at equal intervals in the convex portion.   The cooling tower according to claim 1 or 2, wherein a wave amplitude in the corrugated plate is 30 mm or more and 50 mm or less.   The cooling tower according to any one of claims 1 to 3, wherein a wave period in the corrugated plate is not less than 4 times and not more than 7 times the amplitude.   The cooling tower according to any one of claims 1 to 4, wherein a diameter of the watering hole is 10 mm or less.   The cooling tower according to any one of claims 1 to 5, wherein an interval between the watering holes in the longitudinal direction of the convex portion is 10 mm or less.

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