JP5835138B2 - Repair method for upper water tank of cross-flow cooling tower - Google Patents

Description

  The present invention relates to a method for repairing an upper water tank in a cross flow type cooling tower.

  In general, as shown in FIG. 1, the cross-flow cooling tower 1 includes a cooling fan 4 disposed at the top of the tower body, an upper water tank 2 disposed at the top of the tower body, and a lower part of the upper water tank 2. The filling 3 arranged in the above, the eliminator 5, the louver 6, the lower water tank 7 arranged at the lower part of the tower body, etc. It is a device that cools the water by evaporating a part of it and making it take contact with the air sucked by the cooling fan 4 and evaporating a part of latent heat of evaporation (for example, Patent Documents 1 to 3). Therefore, in the cross-flow type cooling tower 1, it is one of the important points for ensuring the cooling capacity that the small droplets of air and water efficiently come into contact with each other.

  Here, the upper water tank 2 is usually made of steel, and the cooling fan 4 is made of metal such as aluminum and made of FRP. The filler 3, the eliminator 5, and the louver 6 are often made of plastic such as polypropylene and are generally combustible.

  And when each of the above main parts deteriorates, deteriorates or breaks down, it is basically possible to replace each part. However, when replacing the upper water tank 2, the upper water tank 2 Since it is attached to the housing by welding, it is necessary to remove a part of the filler 3 disposed below the upper water tank 2 in order to prevent a fire. For example, in FIG. 1, the filler indicated by 3a is removed.

  Normally, after the repair work (replacement work) of the upper water tank 2 is completed, the removed filling material 3a is filled again, or the filling material 3a is also updated in accordance with the upper water tank.

JP 7-218183 A JP 10-1111094 A JP 2001-289592 A

  As described above, when a part 3a of the filling 3 is removed for the renewal of the upper water tank 2, normally, the removed filling 3a is refilled, but the deterioration of the filling 3a itself or the filling stand Due to deterioration, refilling may be difficult. In that case, it is only necessary to update the filler 3a and the filler gantry to a new one, but there is a problem that costs are increased.

  On the other hand, even after the repair work of the upper water tank 2 is completed, if the place where the filler 3a is removed is left hollow, the cavity of the trace of the filler 3a has a smaller pressure loss than the place where the filler 3 is present. In addition, there is a problem that air flows selectively through the cavity of the filler 3a trace, and the contact efficiency between the small droplets of water and the air is remarkably deteriorated so that the cooling capacity is greatly reduced.

  The present invention has been made in view of the above circumstances, and when repairing the upper water tank of the cross-flow type cooling tower, the packing cannot be refilled due to deterioration of the packing or the packing base. However, an object of the present invention is to provide a repair method for the cross-flow type cooling tower upper water tank that can prevent the cooling capacity from being lowered and can be repaired at low cost.

  In order to solve the above problems, the present invention has the following features.

  [1] A cooling fan disposed at the top of the tower body, an upper water tank disposed at the upper part of the tower body, a packing disposed below the upper water tank, and a lower water tank disposed at the lower part of the tower body In the cross flow type cooling tower, when a part of the packing is removed for repairing the upper water tank, a pressure loss generating means for generating a pressure loss equivalent to the removed packing is provided. A method for repairing the upper water tank of the cross-flow type cooling tower, characterized in that it is installed at a location where the water is removed.

  [2] The method for repairing the upper water tank of the cross flow type cooling tower according to [1], wherein the pressure loss generating means is a perforated plate.

  In the present invention, when repairing the cross-flow type cooling tower upper water tank, when a part of the packing is removed to prevent a fire, pressure loss generation that generates a pressure loss equivalent to the removed packing Since the means is installed at the place where the packing is removed, the occurrence of air drift is prevented and the cooling capacity is prevented from lowering, and the packing and packing stand are updated to new ones. The upper water tank can be repaired at a lower cost than in the case of doing so.

It is a structural diagram of a cross flow type cooling tower. It is a figure which shows one Embodiment of this invention. It is a figure which shows the example of the pressure loss generation | occurrence | production means used in one Embodiment of this invention. It is an example of the correlation diagram of the pressure loss by a pressure loss generation | occurrence | production means, and a drift.

  An embodiment of the present invention will be described with reference to the drawings.

  First, the cross flow type cooling tower to be used in this embodiment is the one shown in FIG. 1 described above, and the cooling fan 4 disposed at the top of the tower body and the upper water tank disposed at the top of the tower body. 2, a filling 3 disposed below the upper water tank 2, an eliminator 5, a louver 6, a lower water tank 7 disposed at the lower part of the tower body, etc., and water sprinkled from the upper water tank 2 in a shower shape The water is cooled by applying a small amount of water to the filler 3 and bringing it into contact with the air sucked in by the cooling fan 4 to evaporate a part of it and take away latent heat of evaporation. .

  And FIG. 2 shows the repair method of the crossflow type cooling tower upper water tank in one Embodiment of this invention.

  As shown in FIG. 2, in this embodiment, when repairing the upper water tank 2 of the cross flow type cooling tower 1, when the part 3a of the packing 3 was removed to prevent a fire, the removal was performed. The pressure loss generating means 10 that generates a pressure loss equivalent to that of the filling 3a is installed at a place where the filling 3a is removed.

  At that time, as the pressure loss generating means 10, a porous plate 11 having a large number of holes 11a as shown in FIG. 3 can be used. The perforated plate 11 is preferably made of any one of galvanized steel plate, stainless steel, and FRP.

  As an example, the pressure loss rate by the pressure loss generating means 10 when the packing is removed by 50% (pressure loss by the pressure loss generating means / pressure loss by the removed packing × 100) and the air drift rate (packing FIG. 4 shows the relationship between the flow rate of air flowing to the place where the air is removed / total flow rate of air flowing into the cooling tower × 100). As shown in FIG. 4, in this example, if the pressure loss rate by the pressure loss generating means 10 is 70% or more and 150% or less, the air drift rate is 55% or less, and the occurrence of drift is suppressed.

  In this way, in this embodiment, even when refilling of the filler 3a cannot be performed due to deterioration of the filler 3a or the filler pedestal, the occurrence of air drift is prevented and small droplets of water and air Can be efficiently contacted, the cooling capacity can be prevented from being lowered, and the upper aquarium 2 can be repaired at a lower cost than when the packing 3a or the packing base is updated to a new one. .

  Examples of the present invention will be described.

In the cross-flow cooling tower with a treated water volume of 1200 m ³ / h, an air volume of 144 m ³ / m ² · min, and a packing pressure loss of 98 Pa, the upper 50% of the packing was removed when the upper water tank 2 was renewed. . An attempt was made to refill the filling removed after the completion of the renewal work for the upper tank, but the filling stand was corroded and it was difficult to refill the filling.

  For this reason, the operation of the cross-flow cooling tower was started as it was without refilling the packing, but when performance was measured, only about 70% of the expected performance was exhibited. As a result of the investigation, the place where the filling material was removed became a cavity, and air flowed preferentially to that place, and there was almost no air flow in the part where the filling material remained. It was estimated that the small drop of water and air were not in contact with each other, which was the cause of the decline in performance.

On the other hand, according to the present invention, a perforated plate (punching plate) that generates a pressure loss of 98 Pa with respect to an air volume of 144 m ³ / m ² · min is manufactured from a galvanized steel plate and the filling is removed (directly). When the punching plate was attached to the outer surface of the AC cooling tower and operated, 100% of the expected performance was exhibited.

  This confirmed the effectiveness of the present invention.

DESCRIPTION OF SYMBOLS 1 Cross flow type cooling tower 2 Upper water tank 3 Packing 3a Removed packing 4 Cooling fan 5 Eliminator 6 Louver 7 Lower water tank 10 Pressure loss generating means 11 Porous plate 11a Porous plate hole

Claims (2)

  Cross flow comprising a cooling fan disposed at the top of the tower, an upper water tank disposed above the tower, a packing disposed below the upper water tank, and a lower water tank disposed below the tower In the type cooling tower, when a part of the packing is removed to repair the upper water tank, pressure loss generating means for generating a pressure loss equivalent to the removed packing is removed from the packing. A method for repairing the upper water tank of the cross-flow type cooling tower, characterized by being installed at a location.   The said pressure loss generating means is a perforated plate, The repair method of the crossflow type cooling tower upper water tank of Claim 1 characterized by the above-mentioned.

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