JP5373468B2 - Cooling tower filler and filler sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filler for a cooling tower having excellent heat exchange efficiency with a relatively small pressure loss. <P>SOLUTION: The filler for the cooling tower is constituted by laminating a plurality of sheets for the filler having a plurality of projections and arranged within the cooling tower. In the filler for the cooling tower, raw water is supplied from the upper side to spaces between layers and outside air is supplied from the lateral side. Thus, the raw water is brought into contact with the outside air for cooling. At least part of the projections is a flat projection formed to have a flat circular truncated cone shape long in the flowing direction of the outside air. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cooling tower filler that is disposed in a cooling tower and cools raw water in contact with outside air, and a filler sheet that constitutes the cooling tower filler.

Conventionally, the cooling water discharged from air conditioning equipment such as factories and buildings has been heated to become hot water, and thus it is difficult to circulate as it is as cooling water. For this reason, the method of cooling and using the cooling water using a cooling tower is adopted.
This type of cooling tower cools raw water by exchanging heat between the raw water and the outside air by bringing the outside air drawn from the outside into contact with the raw water (cooling target water) flowing in the specified direction. Is used.
In such a cooling tower, the inside is filled with a cooling tower filler formed by laminating a plurality of sheets of filler material as plate members so that raw water flows between the layers of the filler (usually between the layers) So that raw water is supplied between the layers from above and outside air is supplied from the side, and heat exchange is performed by contact between the raw water and the outside air. It is configured.

  By the way, in the filler as described above, conventionally, it is usually laminated from the viewpoint of securing the interlayer distance to which raw water and outside air are supplied and from the viewpoint of sufficiently bringing the raw water supplied between the layers and the outside air into contact. A material having a large number of columnar protrusions is used in the filler sheet (Patent Document 1).

  That is, in such a filler, the protrusions secure a gap between the raw water and the outside air supplied between the layers of the laminated filler sheets, and the raw water supplied between the layers is provided to the protrusions. The residence time of the raw water flowing between the layers is increased by collision and the splash effect (the effect of promoting the gas-liquid contact by increasing the liquid surface by making the water droplets fine) is excellent in heat exchange rate. It will be a thing.

JP 2007-120919 A

However, in the above conventional filler, when the number of protrusions of the filler sheet is increased in order to increase the heat exchange rate, the opening ratio (the outside air of the filler sheet is supplied in the filler). As a result, the ratio of the projected openings in the entire area between the layers is low, and the pressure loss for supplying the outside air between the layers increases.
On the other hand, when the number of protrusions is reduced, the aperture ratio increases and the pressure loss decreases, but the corresponding collision between the raw water and the protrusions decreases, and the heat exchange rate decreases.

  Therefore, in view of the above problems, the present invention provides a cooling tower packing material having an excellent heat exchange rate despite relatively little pressure loss, and a packing material sheet constituting the packing material. Let it be an issue.

In order to solve the above problems, the present invention is configured by laminating a plurality of sheets of filler having a plurality of protrusions, arranged in a cooling tower, supplied with raw water from above between layers, and on the side. A cooling tower filler that cools raw water in contact with the outside air by supplying outside air from the side, and at least a part of the protrusion is formed in a flat truncated cone shape that is long in the direction of the outside air flow Provided is a cooling tower filler characterized in that it is formed into a flat protrusion.
The filling sheet is provided with a recessed portion that is recessed in a direction opposite to the protruding direction of the flat protrusion.
The recessed portion forms a protruding portion that protrudes on the back surface side.
The flat protrusion is a portion that is in contact with a protrusion on the back side of the recessed portion of the opposing filler sheet, and the filler sheet has a portion other than the flat protrusion and the recessed portion. A wave pattern with a waved surface is formed.

In such a configuration, since the flat protrusion is a flat shape that is long in the flow direction of the outside air, the raw water supplied from above often collides with the extent that the outside air collides. Furthermore, since the flat protrusion has a truncated cone shape and there are no corners at both ends in the longitudinal direction, pressure loss can be reduced as compared with those having corners. Therefore, although the pressure loss is relatively small, the residence time of the raw water can be increased and the splash effect can be increased.
The raw water that flows down the surface of the filler sheet in a layered manner is more efficiently exchanged with the outside air as it spreads thinner on the sheet surface, but normally the raw water is less likely to flow below the protrusions. In particular, in the case of a flat protrusion, the area where raw water does not flow increases and the heat exchange rate decreases.
However, in the present invention, since the flat protrusion is formed in the shape of a truncated cone, the raw water that has flowed down to the upper surface of the flat protrusion flows down from the hem to the top along the upper surface of the flat protrusion. However, the raw water that wraps around the curved surface at both ends in the longitudinal direction and wraps around the bottom surface flows down from the top to the bottom along the surface on the bottom surface due to the surface tension it holds. Then, it will also flow down to the lower side of the flat protrusion. Accordingly, the raw water does not flow below the protrusions, and the heat exchange rate is less likely to decrease.

In the present invention, the flat protrusions are arranged so as to form a line along the flow direction of the outside air, and the line is formed in a plurality of stages in the vertical direction, and at least one of the flat protrusions. parts are that have been placed in position deviated from the vertical beneath the upper flat projection.
According to such a cooling tower filler, when a part of the raw water is separated from the surface of the filler sheet and falls as water droplets, the water droplets that have not collided with the flat protrusions of a certain stage are The probability of colliding with a flat protrusion on the step below the step becomes high. That is, the probability of colliding with the lower flat projection and scattering as fine water droplets is high, and the heat exchange rate is further improved by the splash effect.

In the present invention, it is preferable that the flat protrusion is provided with a reinforcing rib along the protruding direction.
Since the flat protrusion is flat, it is easier to bend in one direction than a circular protrusion. However, if the reinforcing rib is not provided along the protruding direction as described above, the flat protrusion Is less likely to be bent inadvertently.

  Further, the present invention is a filler sheet having a plurality of protrusions constituting the cooling tower filler, wherein at least a part of the protrusions is formed in a flat truncated cone shape that is long in one direction. The present invention provides a filler sheet characterized in that it is formed into a flat protrusion.

  As described above, according to the present invention, it is possible to provide a cooling tower packing material that can be excellent in heat exchange rate despite relatively little pressure loss, and a packing material sheet constituting the packing material. Can do.

The schematic diagram of the cooling tower in which the filler for cooling towers of one embodiment is used. The figure which looked at the filler for cooling towers concerning the embodiment from the external air supply side. The top view which shows the sheet | seat for fillers of the embodiment. The flat protrusion part of the same embodiment is shown, (A) is a schematic view of the flat protrusion part as viewed from the top side (namely, front), (B) is a schematic cross-sectional view along line AA in (A), C) is a schematic cross-sectional view taken along line B-B in FIG. The recessed part of the same embodiment is shown, (A) is a schematic front view of the recessed part, (B) is a schematic sectional view along line AA in (A), and (C) is a schematic line along line B-B in (A). Sectional drawing. Schematic cross-sectional end view showing the flat protrusion and recessed portion of the same embodiment

Embodiments according to the present invention will be described below.
First, the cooling tower filled with the cooling tower filler of this embodiment will be described.

  The cooling tower filled with the cooling tower filler of the present embodiment is for cooling raw water such as cooling water heated and discharged by factory equipment or the like.

FIG. 1 is a schematic view showing the cooling tower.
As shown in FIG. 1, the cooling tower includes a substantially columnar or prismatic casing 50 in which an outside air inlet 51 is formed on a side peripheral surface and an outside air outlet 52 is formed in the center of the upper surface, and the inside of the casing 50. The cooling unit 60 is arranged along the outside air intake 51 so that the raw water A and the outside air B are brought into contact with each other and the raw water A is cooled by heat exchange, and the cooling unit 60 is supplied so that the raw water A is sprayed to the cooling unit 60. The raw water supply unit 70 disposed above the cooling unit 60, the cold water tank 80 for storing the cold water cooled by the cooling unit 60, and the ventilation formed in the central part of the casing 50 so as to be surrounded by the cooling unit 60 The air blower 100 which discharges the outside air B used for cooling to the outside air discharge port 52 through the space 90 is provided.
The cooling unit 60 is disposed closer to the outside in the casing 50 so that a ventilation space 90 is formed on the center side in the casing 50.
The cooling unit 60 is filled with the cooling tower filler 1 connected in a plurality of stages in the vertical direction, and the raw water A supplied from above by the raw water supply unit 70 and the outside air intake 51 of the casing 50. The outside air B supplied from the side via the heat is exchanged in the cooling tower filler 1, the cooled raw water A is discharged to the cold water tank 80, and the outside air B heated by the heat exchange is centered. It is comprised so that it may discharge to the ventilation space 90 of a part.

Next, the cooling tower filler 1 of the present embodiment packed in a plurality of stages in the cooling tower as described above and the filler sheet 5 constituting the cooling tower filler 1 will be described.
FIG. 2 is a diagram showing a state in which the cooling tower packing material 1 is viewed from the side to which the outside air B is supplied, and FIG. 3 is a plan view showing the packing material sheet 5 constituting the cooling tower packing material 1. It is.
As shown in FIGS. 2 and 3, the cooling tower filler 1 of the present embodiment is configured by laminating a plurality of filler sheets 5 having a plurality of protrusions 6 and recesses 7, and a cooling unit 60. The raw water A is supplied from above and the outside air B is supplied from the side between the layers so that the raw water A is brought into contact with the outside air B to be cooled.
The cooling tower filler 1 has a space formed between layers by a plurality of protrusions 6 and recesses 7 of the laminated filler sheet 5, and the formation of the space results in the raw water A and the outside air. B can be supplied between the layers.

That is, as shown in FIG. 2, the cooling tower filler 1 is formed in a state where the respective filler sheets 5 are laminated, and the front side of the protrusion 6 of the one filler sheet 5 and the next side. The laminated sheet 5 for the filler 5 is laminated so that the back side of the recessed portion 7 faces and contacts each other, and a space corresponding to the sum of the height of each protruding portion 6 and the depth of the recessed portion 7 is formed between the layers. ing.
Further, the cooling filler 1 has the height of the protrusions 6 and the depth of the recesses 7 adjusted to be constant so that the interlayer has a substantially constant thickness, and each of the filler sheets 5 is substantially parallel. It is laminated to make.
In addition, each sheet | seat 5 for fillers is maintained by the lamination | stacking state by the adhesion | attachment etc. which respectively used the adhesive agent.
Spacing between the filler sheets 5 in the cooling tower filler 1 (in the state where the filler sheets 5 are arranged in parallel, a ridge line 8a of a wave pattern 8 described later of one filler sheet 5) The distance in the width direction between the ridge 8a and the apex of the ridge line 8a of the wave pattern 8 of the other filler sheet 5 adjacent thereto is usually about 10 to 40 mm. Further, the number of the filler sheets 5 necessary for constituting the cooling tower filler 1 is usually about 10 to 30 sheets depending on the required size of the filler 1.

As shown in FIG. 3, the filler sheet 5 is formed in a flat plate shape and has a rectangular shape (including a square) or a parallelogram (a sharp corner, usually 75 degrees or more and less than 90 degrees). The protrusion 6 and the recessed portion 7 are formed on the surface.
The filler sheet 5 is made of synthetic resin and is integrally formed by press molding using a mold, and the size is not particularly limited, but the length and height of the bottom surface. Is set to about 400 to 1000 mm, and the thickness is usually about 0.2 to 0.7 mm.

  Examples of the synthetic resin used for the filler sheet 5 include hard polyvinyl chloride and polypropylene.

Each of the protrusions 6 is formed so as to protrude outward, and most of the protrusions 6 are flat protrusions 6 formed in a flat truncated cone shape that is long in the flow direction of the outside air B.
FIG. 4 shows the flat protrusion 6, (A) is a schematic view of the flat protrusion 6 viewed from the top side (that is, the front), and (B) is the AA line of (A). It is a schematic sectional drawing, (c) is a BB schematic sectional drawing of (a).
As shown in FIGS. 4 and 3, the flat protrusion 6 has an elliptical shape in which the cross-sectional shape is flat in the flow direction of the outside air B (specifically, both longitudinal ends are arc-shaped and both lateral ends are linear) In a truncated cone shape in which the cross-sectional shape is elliptical and the cross-sectional area is tapered toward the top portion 6a and the top portion 6a is planar. Formed.
Grooves 6b extending along the protruding direction are formed as reinforcing ribs at both ends in the lateral direction of the planar protrusion 6.
The length L1 in the longitudinal direction of the flat protrusion 6 is usually 10 to 40 mm, and the length L2 in the short direction is usually 5 to 20 mm. Preferably, the flatness ratio (short direction length L2 / longitudinal length L1) Is set to 0.25 to 0.75.
In addition, the protrusion height L3 is normally set to 5 to 35 mm, and the inclination angles α and β with respect to the perpendicular are normally set to about 5 to 35 degrees.
Further, the density of the flat protrusions 6 is usually about 100 to 200 per 1 m ² . The height of the reinforcing rib formed by the groove 6b (depth of the groove 6b) is not particularly limited, but is set to 1 to 3 mm.
The reinforcing rib is preferably formed by the groove 6b from the viewpoint of reducing pressure loss when air is circulated, but is formed by the groove 6b from the viewpoint of simply reinforcing the flat protrusion 6. It is not limited to what is carried out, You may form as a protrusion streak in the surface of the transversal direction both ends of the flat protrusion part 6. FIG.

The recessed portions 7 are formed so as to be recessed in the direction opposite to the protruding direction of the flat protrusion 6.
FIG. 5 shows the recessed portion 7, (A) is a schematic front view of the recessed portion 7, (B) is a schematic cross-sectional view taken along line AA of (A), and (C) is (A). It is a BB line schematic sectional drawing of.
As shown in FIGS. 5 and 3, the recessed portion 7 is recessed so that the cross-sectional shape thereof is circular, and the recessed portion 7 has a protruding portion protruding in the same shape on the back surface side. There is no.
The size of the recessed portion 7 is usually set such that the diameter L4 is about 10 to 45 mm.
Further, the indentation depth L5 (depth from the valley portion of the wave pattern 8 described later) is set to 2 to 10 mm.
The density of the recessed portions 7 is set to the same value as that of the flat protrusion 6.

As shown in FIG. 3, the flat protrusions 6 and the recessed portions 7 are preferably formed so as to form a row along the flow direction of the outside air B and to form a plurality of rows in the vertical direction. It is arranged so that 5 to 20 steps per 1 m are formed.
In FIG. 3, 15 stages are shown.
Moreover, in the same row | line | column, it arrange | positions so that the flat projection part 6 and the recessed part 7 may be alternately replaced one by one.
Furthermore, most of the flat protrusions 6 are arranged so as to be displaced from the vertical direction of the upper flat protrusions 6 and are arranged in a staggered manner as a whole. Similarly, most of the recessed portions 7 are arranged so as to be displaced from a position directly below the upper recessed portion 7 and are arranged in a staggered manner as a whole.

FIG. 6 is a schematic cross-sectional end view showing the flat protrusion 6 and the recessed portion 7 in a state where the filler sheets 5 are laminated.
In each of the filler sheets 5, as described above, in the stacked state, the flat protrusion 6 of one filler sheet 5 and the recessed portion 7 of the next stacked filler sheet 5 face each other. Specifically, as shown in FIG. 6, in each of the filler sheets 5, in the stacked state, as shown in FIG. 6, the top portion 6 a upper surface side of each flat protrusion 6 and the bottom rear surface side of the recessed portion 7. The flat protrusions 6 and the recessed portions 7 are arranged so as to be in contact with each other and are laminated.

The filling material sheet 5 is formed with a wave pattern 8 having a waved surface so as to increase the surface area in almost the whole area other than the portion where the flat protrusions 6 and the recessed portions 7 are formed (FIG. (Only a part is shown in 3).
The peak portion of the wave pattern 8 is set lower than the flat protrusion 6.
Further, the wave pattern 8 has its ridge line 8a (shown by a thick line in FIG. 3) and valley line 8b (shown by a thin line in FIG. 3) parallel to each other and from above to below. It is formed to meander in a zigzag when moving. The height of the wave pattern 8 (height between the apex of the ridge line 8a and the apex of the valley line 8b) is not particularly limited, but is about 3 to 10 mm.

Since the cooling tower filler 1 and the filler sheet 5 of the present embodiment are formed with the wave pattern 8 on the surface of the filler sheet 5 as described above, along the surface of the filler sheet 5. The surface area of the raw water A flowing through can be increased, and heat exchange with the outside air B can be efficiently performed.
Further, the wave pattern 8 is formed so as to meander zigzag when the ridge line 8a and the valley line 8b move from the upper side to the lower side, so that the raw water A flowing along the valley line 8b from the upper side to the lower side is formed. The residence time can be lengthened, and the raw water A can be cooled to a lower temperature.

The cooling tower filler 1 and the filler sheet 5 of the present embodiment are configured as described above. However, in the present invention, the design is not limited to the above-described configuration and can be changed as appropriate.
For example, in the present embodiment, the recessed portion 7 is formed in a circular cross section or the like, but specifically, in the same manner as the flat protrusion 6, the cross sectional shape is formed in a flat elliptical shape that is long in the flow direction of the outside air B. May be.
Further, in the cooling tower filler 1 and the filler sheet 5 of the present embodiment, the flat protrusion portion 6 is formed on the columnar base portion 9, but in the present invention, there is no base portion 9. It may be. Furthermore, in the present embodiment, the reinforcing rib is formed on the flat protrusion 6, but in the present invention, the reinforcing rib is not formed when there is no problem in strength or the like. It may be.

A ... Raw water, B ... Outside air, 5 ... Filler sheet, 6 ... Flat projection,
6b ... Reinforcing rib

Claims (3)

A plurality of filler sheets having a plurality of protrusions are stacked and arranged in a cooling tower, and raw water is supplied from above by supplying raw water from above and outside air from the side. A cooling tower filler that cools in contact with outside air,
At least a part of the protrusion is a flat protrusion formed in a flat truncated cone shape that is long in the flow direction of outside air,
The filler sheet has a recessed portion that is recessed in a direction opposite to the protruding direction of the flat protrusion,
The recessed portion forms a protruding portion protruding on the back side,
The flat protrusion is a part that comes into contact with the protrusion on the back side of the recessed portion of the opposing filler sheet,
In the sheet for filler, a wave pattern having a waved surface is formed in a portion other than the flat protrusion and the recessed portion ,
The flat protrusions are arranged so as to form a row along the flow direction of the outside air, and the row is formed in a plurality of stages in the vertical direction,
At least a part of the flat protrusion is arranged so as to be displaced from a position directly below the upper flat protrusion.   The filler for cooling towers according to claim 1, wherein the flat protrusion is provided with a reinforcing rib along the protruding direction. A sheet for a filler having a plurality of protrusions constituting the cooling tower filler according to claim 1 or 2 by lamination,
At least a part of the projecting portion is a flat projecting portion formed in a flat truncated cone shape that is long in one direction.

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