JP2009168401A - Cooling tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling tower reducing the frequency of strainer cleaning work by reducing mixing of various contaminants and foreign matters into a water collecting tank. <P>SOLUTION: The cooling tower is constituted to circulate cooling water 10 by sprinkling the cooling water 10 on a filler 4 from an upper part of the cooling tower to flow down the filler 4 while contacting outside air, to drip in a lower water tank 8, to further flow to the water collecting tank 9 arranged under a lower water tank 8 continuously with the lower water tank 8, and to flow to a cooling water outlet 9b connected to the water collecting tank 9, wherein the lower water tank 8 is provided with a weir to surround the periphery of an inflow port 9a of the water collecting tank 9, so that the foreign matter 11 accumulated at the bottom part 8b of the lower water tank 8 is prevented from flowing into the water collecting tank 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling tower that circulates and supplies cooling water used in a refrigerator, a cold / hot water machine, a heat exchanger for various processes, and the like.

  Cooling towers are widely used for cooling water in refrigerators, cold / hot water machines, heat exchangers for various processes, and the like. The cooling tower cools the object to be cooled and brings the cooling water whose temperature has increased into contact with the outside air, thereby evaporating a part of the cooling water and releasing latent heat of evaporation, thereby reducing the temperature of the cooling water. It is.

  The outside air to be brought into contact with the cooling water to be cooled is generally forcibly taken in by a blower, and the intake method includes a countercurrent type in which the cooling water and the outside air flow in opposite directions, and both There is a cross-flow type that flows so as to form a cross-flow.

Both methods have their merits and demerits, and the most suitable one is selected in consideration of various conditions such as installation location and cooling tower capacity. In a small-scale cooling water system with a circulating water amount of 300 m ³ / h or less, a round countercurrent cooling tower is usually used. On the other hand, in cooling towers used for industrial and commercial purposes, the amount of circulating water is often 300 m ³ / h or more, and it is common to install a square cross-flow cooling tower (FIG. 3) outdoors. is there.

  In the cooling tower 16 shown in FIG. 3, the cooling water 10 that has been used for cooling the refrigerant in the refrigerator 14 and whose temperature has risen is cooled as follows. The cooling water 10 that has been used in the refrigerator 14 and whose temperature has risen passes through the piping path 15, returns to the sprinkler tank 2, and then is sprayed onto the upper portion of the filler 4 by the spray water device 3 and flows down through the filler 4.

  On the other hand, the outside air taken in by the blower 7 driven by the motor 7 a or the like flows into the filler 4 horizontally from the inlet louver 5 and comes into contact with the cooling water 10 flowing down through the filler 4. A part of the cooling water 10 evaporates due to contact with the outside air, and the remaining cooling water 10 is cooled by the latent heat of evaporation.

  The cooling water 10 cooled without evaporating flows down through the filler 4 and drops into the lower water tank 8 and is sent from the water collecting tank 9 to the refrigerator 14 by the circulation pump 13 to be used as cooling water. Cycle through the path. The outside air that has come into contact with the cooling water 10 is drained by the eliminator 6 and discharged from above by the blower 7.

  Since the cooling tower 16 takes outside air into the tower and cools the cooling water 10 in this way, foreign substances 11 such as dust, various kinds of dust, and fallen leaves are mixed into the lower water tank 8 in the tower together with the outside air.

  Further, when the operation is stopped, the scale and other foreign matters 11 adhering to the packing material in the tower are dried and peeled off from the packing material 4 and mixed into the lower water tank 8.

  In particular, in recent years, there is a strong tendency for highly concentrated management of the cooling water 10 for the purpose of saving makeup water, and the amount of scale attached to the filler 4 of the cooling tower 16 has increased. Along with this, the amount of scale that peels off and mixes into the lower water tank 8 is also increasing.

  Various kinds of garbage and foreign matter 11 mixed in the lower water tank 8 are pushed by the flow of water and enter the pipe path 15 from the lower water tank 8 through the water collection tank 9, and damage the equipment such as the circulation pump 13 and the refrigerator 14. Therefore, a strainer 9c is provided at the cooling water outlet 9b of the water collecting tank 9 to prevent entry into these piping paths 15. In addition, the strainer 9c may not be provided at the cooling water outlet 9b, and a strainer may be provided in the piping before the circulation pump 13.

  In this case, with the passage of time, various kinds of dust and foreign substances 11 adhere to and accumulate on the strainer 9c, and the pipe resistance increases. In some cases, the strainer 9c may be blocked or damaged. If it adheres and accumulates to a certain extent, it is necessary to remove and clean these.

  However, when removing or cleaning various kinds of dust and foreign matter 11 adhering to and depositing on the strainer 9c, it is necessary to stop the operation of the cooling tower 16 and drain the water in the cooling tower 16, and during the cleaning of the strainer 9c, It was a problem that the operation of the apparatus and equipment had to be stopped.

  From such a situation, a cooling tower strainer described in Patent Document 1 has been proposed as one of the improvement measures. The strainer for a cooling tower is formed as a substantially box-like body in which the strainer body is disposed in a state where it is concealed in the lower water tank and the side part is connected to the cooling water outlet to communicate the inside, and one or a plurality of side parts And the bottom surface of the lower water tank, and a portion of the upper surface portion excluding the vicinity of the connection portion with the intake port is made lower than the upper end position of the intake port, and the filter forms a part of the cylindrical surface. It is formed of a curved substantially plate-shaped filter medium, has a gap with the bottom of the lower water tank, and is disposed with the curved convex side facing downward in a state of being positioned outside the water intake. .

By optimizing the shape, it is easy to check impurities such as impurities and scales accumulated in the filtration part, and maintenance workability such as cleaning can be greatly improved. Thereby, the stop time of the cooling tower due to the strainer cleaning can be shortened.
JP 2005-324090 A

  However, the shape and structure of the strainer is improved, the maintenance workability during strainer cleaning is greatly improved, and even if the cooling tower stop time caused by strainer cleaning is shortened, it is pushed by the flow of water into the water collection tank. Since there was no change in the amount of various kinds of dust and foreign matter that flowed in, the strainer cleaning work itself had to be carried out frequently, which was not a drastic improvement measure.

  Therefore, an object of the present invention is to provide a cooling tower that can reduce the frequency of strainer cleaning work by reducing the mixing of various kinds of garbage and foreign matters into the water collection tank.

In the present invention, in order to solve the above-mentioned problem, the cooling water 10 is sprinkled from the upper part of the cooling tower to the filler 4, flowing down the filler 4 while being in contact with the outside air, and dropping into the lower water tank 8. In the cooling tower that flows from the water tank 8 to the water collecting tank 9 arranged continuously below the lower water tank 8, flows to the cooling water outlet 9b connected to the water collecting tank 9, and circulates, the inlet 9a of the water collecting tank 9 A dam is provided in the lower water tank 8 so as to surround the periphery, and it is configured as a cooling tower characterized by preventing the inflow of foreign matter 11 deposited on the bottom 8b of the lower water tank 8 into the water collecting tank 9,
The upper end of the weir is at a position lower than the water surface 10a of the lower water tank 8,
The dam has a substantially L-shaped cross section, and the cooling tower is configured as described above.

  Since this invention is the above structure, it has the following effects. First, since various kinds of garbage and foreign matters 11 mixed in the lower water tank 8 do not flow into the water collecting tank 9, the amount of contaminants supplemented by the strainer 9c is extremely reduced, the number of cleanings is drastically reduced, and the strainer 9c The cooling tower operation stop interval resulting from cleaning is dramatically increased.

  For example, when the present invention is applied to the operation of the cooling tower in operation, the cleaning work of the strainer 9c, which has been performed about once a week in the past, is sufficient to be performed about once every three months. The number of cleanings was reduced.

  On the other hand, since various kinds of dust and foreign substances 11 that normally flow into the water collection tank 9 are blocked by the weir provided around the inlet 9a of the water collection tank 9, they are accumulated around the weir. However, since various kinds of dust and foreign matter 11 accumulated around the weir of the lower water tank 8 are shallow in the lower water tank 8 part where the weir is provided, the operation of the cooling tower is stopped or the lower water tank 8 and the water collecting tank 9 are stopped. And it can remove easily with normal cleaning tools, such as a rake, without draining the water in the piping path 15.

  Next, since the implementation of the present invention can be realized by a simple means of providing a weir around the inflow port 9a from the lower water tank 8 to the water collecting tank 9, the present invention does not require a large cost, and the existing This facility can be applied without additional measures such as major modifications.

  For the purpose of providing a cooling tower that can reduce the frequency of strainer cleaning work by reducing the mixing of various garbage and foreign matters into the water collection tank, the cooling water 10 is sprinkled from the upper part of the cooling tower to the filler 4, While contacting the outside air, the filler 4 flows down and drops into the lower water tank 8, and further flows from the lower water tank 8 to the water collecting tank 9 arranged continuously below the lower water tank 8, and is connected to the water collecting tank 9. In the cooling tower that flows and circulates to the cooling water outlet 9b, a weir having a substantially L-shaped cross section is provided so that the upper end is positioned lower than the water surface 10a of the lower water tank 8 so as to surround the inlet 9a of the water collecting tank 9. This was realized by adopting a cooling tower configuration characterized in that the foreign matter 11 deposited on the bottom 8b of the lower water tank 8 is prevented from flowing into the water collecting tank 9.

  The weir 12 is installed so as to surround the periphery of the inlet 9a of the water collecting tank 9 in the lower water tank 8 of the cooling tower, and prevents foreign matter 11 deposited on the bottom 8b of the lower water tank 8 from flowing into the water collecting tank 9. If possible, the shape, material and installation method are not particularly limited.

  For example, a metal such as an L-shaped steel, a flat steel, a square steel pipe, or a resin material may be installed so as to surround the periphery of the inflow port alone, or the various metals and the resin material may be integrated into a frame shape in advance. You may install what you made. If the material used for the weir is steel as described above, even if it is installed on the bottom 8b of the lower water tank 8 as it is, its weight is so great that the weir will not be pushed by the cooling water and move. However, if bolts, welding, fitting, or the like is used, the weir can be securely fixed to the bottom 8b of the lower water tank 8. When using a material in which holes are not drilled in these weirs, the upper end of the weir 12 must be lower than the water surface 10a of the lower water tank 8 so that the cooling water 10 does not overflow from the upper end 8a of the lower water tank 8. .

  In addition, the weir may be higher than the water surface 10a of the lower water tank 8 and further the upper end 8a as long as the structure is made of a material such as a net or a net punched with fine holes that do not allow the passage of foreign substances 11 such as scales. However, when the hole or the mesh is blocked by a clogged foreign substance drifting on the water surface 10a, the cooling water 10 may overflow from the lower water tank 8, so that the height of the weir 12 is the water surface 10a of the lower water tank 8, That is, it is desirable that the position be lower than the normal water level.

  Hereinafter, the cooling tower which is this invention is demonstrated in detail based on an accompanying drawing.

  FIG. 1 is a schematic sectional view of a cooling tower according to the present invention. 2 is a schematic cross-sectional view taken along the line AA in FIG.

  In the cooling tower 1 according to the present invention, foreign matter 11 such as scale and dust deposited on the bottom of the lower water tank 8 does not flow into the water collecting tank 9 that is continuously provided below the lower water tank 8 of the cooling tower that is generally used. Thus, a weir 12 is provided around the inlet 9a leading to the water collection tank 9.

  Therefore, the weirs 12 should surround the inflow port 9a of the water collection tank 9 and contact each other, and stand up from the bottom 8b of the lower water tank 8 to a position lower than the water surface 10a of the lower water tank 8 without a gap.

  Here, the weir 12 has a substantially L-shaped cross section, and its upper end is located at a position lower than the water surface 10 a of the lower water tank 8. As a result, the foreign matter 11 such as scale and dust accumulated on the bottom 8b of the lower water tank 8 stays in the lower water tank 8, and the cooling water 10 of the lower water tank 8 flows over the weir 12 and into the water collecting tank 9.

  If the weir 12 is L-shaped steel, it can be fixed to the bottom 8b of the lower water tank 8 by its own weight without using a bolt or the like.

  In the cooling tower 1 according to the present invention thus formed, the cooling water 10 is sprinkled from the upper part of the tower to the filler 4, and flows down while dropping into the lower water tank 8 while contacting the outside air. The water flows from the lower water tank 8 to the water collecting tank 9 arranged continuously below the lower water tank 8, flows to the cooling water outlet 9b provided with the strainer 9c connected to the water collecting tank 9, and the refrigerating machine 14 etc. by the circulation pump 13 or the like The equipment is cooled to return to the cooling tower via the piping path 15 and circulated.

  Since the foreign matter 11 mixed in the lower water tank 8 surrounds the inlet 9a and the weir 12 is installed, the frequency of flowing into the water collection tank 9 is extremely reduced, and the cleaning period of the strainer 9c is greatly extended. It becomes.

It is a section schematic diagram of the cooling tower which is the present invention. FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1. It is a section schematic diagram of a general cooling tower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Sprinkling tank 3 Sprinkling water apparatus 4 Filler 5 Inlet louver 6 Eliminator 7 Blower 7a Motor 8 Lower water tank 8a Upper end 8b Bottom part 9 Water collecting tank 9a Inlet 9b Cooling water outlet 9c Strainer 10 Cooling water 10a Water surface 11 Foreign matter 12 Weir 13 Circulating pump 14 Refrigerator 15 Piping path 16 Cooling tower

Claims (3)

Cooling water is sprinkled on the filler from the upper part of the cooling tower, flows down the filler while in contact with the outside air, drops to the lower water tank, and further from the lower water tank to the water collecting tank arranged continuously below the lower water tank. In the cooling tower that flows and flows to the cooling water outlet connected to the water collecting tank and circulates,
A cooling tower characterized in that a weir is provided in a lower water tank so as to surround a periphery of the inlet of the water tank, and foreign substances accumulated at the bottom of the lower water tank are prevented from flowing into the water tank.   The cooling tower according to claim 1, wherein an upper end of the weir is at a position lower than a water surface of the lower water tank.   The cooling tower according to claim 1, wherein the weir has a substantially L-shaped cross section.

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