JP2747835B2 - Filler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing heat between water or a solution mainly composed of water and air, such as a cooling tower, a condensing tower, a deodorizing tower, and a dust removing tower. The present invention relates to a packing material to be packed in a packed tower that performs transfer and / or mass transfer.

[Conventional technology]

2. Description of the Related Art Conventionally, in a packed tower for performing heat transfer and / or mass transfer between a gas and a liquid, various packing materials such as a ball, a rod, a ring, a saddle, and a plate can be considered. Among them, those having a shape suitable for the use and having a large gas-liquid contact area and high gas-liquid contact efficiency are selected and used. Among them, in a cooling tower or the like, a plate-like filler is mainly used, and for example, a corrugated plate-like filler 1 as shown in FIG.
Are arranged in parallel at equal intervals and perpendicular to the horizontal plane. A water flow 4 flows down from above the filler 1 and an air flow 5 passes between the fillers 1 from below or from the side, and flows down along the surface of the filler 1. The air flow 5 comes into contact with the generated water 7 and evaporates. At that time, latent heat of vaporization is taken away, and the water 7 is cooled and flows out from below. In the plate-like filler 1, the surface area of the filler is increased in order to increase the surface area of the filler so as to increase the gas-liquid contact area, and to ensure that water is sufficiently retained on the surface of the filler. In order to form the filler, the surface of the plate-like filler is corrugated as shown in FIG. 4, or the corrugated or trapezoidal shape is arranged in a staggered pattern as shown in FIG. Is provided with an uneven surface.

Conventionally, packing materials used for packing towers have been composed of various materials such as stones, ceramics, metals, and synthetic resins.For example, packing materials for cooling towers using water as a cooling medium are inexpensive. Due to its light weight, ease of molding and processing, synthetic resins, especially thermoplastic synthetic resins, have been used as substrates.

[Problems to be solved by the invention]

In the prior art, a plate-like filler having an uneven surface on its surface, such as a corrugated plate-like filler shown in FIG. 4 or a plate-like filler shown in FIG. By providing the uneven surface portion on the filler surface, the uneven surface portion protrudes into the air flow passage region formed between the opposing filler surfaces and reduces the cross-sectional area of the passage region, that is, The projected area of the filler on the front surface of the air flow was as shown in FIG. 6, and the pressure loss was large, so that efficient heat and / or mass transfer could not be performed.

In addition, thermoplastic synthetic resins conventionally used conventionally as a filler material are generally hydrophobic, and therefore, a filler based on the resin repels water on the surface, and is sufficiently dispersed over the entire surface. Water film cannot be formed,
Since a partially dried surface is generated, there is a problem that heat transfer and / or mass transfer surface unevenness occurs, and the heat exchange performance or the like may not be sufficient.

That is, when the base material of the filler is made of a thermoplastic resin in FIG. 4, the surface thereof is easy to repel water,
There is a problem that a dry portion is formed without being partially wet, and the water film 8 is not formed on the entire surface to cause unevenness, so that sufficient evaporation is not performed and the cooling effect is impaired. Met.

The present invention solves the above problems of the prior art, reduces the pressure loss, promotes the mixing of the air flow to improve the heat transfer performance, and forms a water film on almost the entire surface of the filler. An object of the present invention is to provide a packing material for a packed tower in which exchange performance and the like are improved and heat transfer and / or mass transfer are performed efficiently.

[Means for solving the problem]

The inventors have repeated experiments and studies in order to solve the above-mentioned problems, and have made the present invention based on knowledge obtained at that time.

The present invention provides, as a means for solving the above-mentioned problems, a packing material packed in a packed tower and used for heat transfer and / or mass transfer between water or a water-based solution and air,
A filler is provided, wherein a plurality of trapezoidal convex portions and an opening portion are provided on the airflow side front surface of the trapezoidal convex portion of the plate-type filler having an uneven surface formed by the back surface of the convex portion. It is assumed that.

The present invention also provides a non-water-absorbing filler packed in a packed tower and used for heat transfer and / or mass transfer between water or a solution mainly composed of water and air. It is intended to provide a filler characterized by comprising a base material molded by mixing a water-soluble resin and a water-absorbent resin.

The filler of the present invention, in which an opening is provided on the airflow-side front surface of the trapezoidal convex portion of the plate-type filler having a plurality of trapezoidal convex portions and an uneven surface formed by the back surface of the convex portion, will be described below. This will be described below.

FIG. 1 shows an example in which the present invention is applied to a plate-like filler having a trapezoidal staggered arrangement shown in FIG. 5 shown in FIG. 5 in the prior art, and an air flow obliquely forward from the right side of the plate-like filler 1. 5 is flowing. In the present invention, the airflow-side front surface 3 of the trapezoidal convex portion 2 of the plate-shaped filler 1 is:
Among the side surfaces of the convex portion 2, a surface facing the air flow and facing the air flow 5 is referred to as a surface which is just a resistance surface against the air flow. In the present invention, an opening 6 is provided on the surface 3. In FIG. 1, this surface 3 is indicated by hatching.

It is usually preferable that the opening is not so large.
The shape may be a square, a triangle, or the like, and a so-called hole may be used. The openings need not be provided on the entire front surface on the air flow side of the convex portion, and it is sufficient that the openings are provided at a considerably large interval. For example, in the plate-shaped filler of FIG. 1, when a substantially trapezoidal convex portion having a top surface width of 8 mm and a height of 5 mm is staggered, the diameter is 3 to
A hole of 4 mm may be provided on the front side of the air flow side of every other convex surface.

By providing this opening on the airflow-side front surface of the convex portion of the filler, a part of the airflow colliding with the airflow-side front surface passes through the opening to the back surface. For this reason, the pressure loss of the air flow is reduced, and the air flow passing through the opening enters the concave portion formed on the back surface of the convex portion, and this concave portion is difficult for the conventional filler to allow the air flow to enter. Has been improved,
The contact between the air stream and the water or solution is also good at the concave part. In addition, the mixing of the air flow is performed thereby, and the flow of the air flow becomes uniform.

In addition, when the present invention comprises a base material formed by mixing a non-water-absorbent resin and a water-absorbent resin with the filler, the non-water-absorbent resin is particularly polypropylene, high-density polyethylene, polyvinyl chloride, or the like. It is preferably used. These are representative of thermoplastic resins conventionally used to form fillers. As the water-absorbing resin mixed with the non-water-absorbing resin, polyethylene oxide, a modified polyethylene oxide, a crosslinked polyacrylic acid (salt), a salt of an isobutylene-maleic anhydride copolymer, and the like are preferable.

The mixing ratio of the non-water-absorbing resin and the water-absorbing resin varies depending on conditions such as the use, shape, and use conditions of the filler, but the content of the water-absorbent resin is at least such that the molded filler is hydrophilic for a long time. And the amount having When, for example, polyethylene oxide is used as the water-absorbing resin, its content is 1 to 10%.

The filler made of a base material formed by mixing a non-water-absorbent resin and a water-absorbent resin has a hydrophilic surface, a water film is formed over a large area over the entire surface of the filler, and effective gas-liquid contact To perform heat transfer and / or mass transfer.

For example, a non-water-absorbent resin and a water-absorbent resin are uniformly mixed in a powder form, and then put into a mold and molded under heat and pressure. A fused and integrated filler can be obtained. And
As shown in FIG. 2, which is a case of a corrugated plate, the filler is in a state in which the non-water-absorbing resin portion and the water-absorbing resin portion are finely and uniformly dispersed, so that the water absorbing material as a whole is , That is, hydrophilic, so that a water film is formed over the entire surface.

The filler of the present invention, in which a water film is formed over the entire surface, can be applied to a cooling tower, and a condensing tower that cools and condenses a gas by a retained water film is held. The present invention can also be applied to a packing material for a packing tower such as a dust removing tower or a deodorizing tower which removes or deodorizes by a wet wall action by a water film.

The filler of the present invention, which is composed of a base material formed by mixing a non-water-absorbent resin and a water-absorbent resin, has a honeycomb shape, a ring shape, a saddle shape, in addition to the plate shape described above. Although various shapes such as a shape can be used, it is preferable to use a plate type or a honeycomb shape for applications such as a cooling tower. In the case of a plate type shape, in addition to the waveform shown in FIG. 2, various shapes such as a shape in which convex portions are staggered like the waveform shown in FIG. 1 can be used.

(Operation)

In the filler provided with the opening of the present invention, the trapezoidal convex portion has an opening on the airflow-side front surface, so that a part of the airflow colliding with the airflow-side front surface passes through the opening and the back surface. As a result, the resistance due to the airflow-side front surface is reduced, thereby reducing the pressure loss. In addition, the airflow passing through the opening enters the concave portion formed on the back surface of the convex portion, thereby improving the difficulty of airflow entering the concave portion when there is no opening. Also, the contact between the air stream and the water or the solution is good even in the concave portion. Mixing of the air flow is also often performed. Therefore, the contact efficiency between the air stream and the water or the solution is improved as a whole.

In addition, in the filler composed of a base material formed by mixing the non-water-absorbent resin and the water-absorbent resin of the present invention, the fine non-water-absorbent resin portion and the fine water-absorbent resin portion are uniformly dispersed on the surface thereof. Is formed, whereby the entire surface becomes hydrophilic, a water film is widely held on the entire surface, and further,
It facilitates the formation of a flowing water film. For this reason, the contact between the air stream and the water or the solution is made good by the filler, and the contact efficiency is improved.

〔Example〕

Hereinafter, the present invention will be described specifically with reference to examples. However, the present invention is not limited to these examples.

Example 1. High density polyethylene (HIZEX, 5000S, MI = 0.8,
Press a 0.5mm thick sheet made by Mitsui Petrochemical Co., Ltd.), and make a trapezoidal convex part with an upper surface of 8mm square and a height of 5mm in a zigzag pattern, so that it is on both sides. Formed and have a diameter on the air flow side front every other convex part.
A plate-like filler having a 4 mm hole was produced. The fillers were arranged in the cooling tower at intervals in the vertical direction. The cooling tower was operated to measure the heat transfer performance.

For comparison, heat transfer performance was measured by arranging plate-like fillers of the same shape without the above-mentioned holes (openings) in a cooling tower.

The measurement results are shown in the table of FIG. Here, Ka is the enthalpy-based total volumetric heat conductivity coefficient.

Example 2. A high-density polyethylene (HIZEX, 5000S, MI = 0.8, Mitsui Petrochemical Co., Ltd.)
5 parts of a modified polyethylene oxide (Sumikagel R-30R, water absorption 30 g / g, manufactured by Sumitomo Chemical Co., Ltd.) was added to 100 parts of the mixture, and mixed well.
m press sheet was created.

This sheet was immersed in tap water at 20 ° C. for 24 hours, then taken out, and the wet state of the surface was observed. The entire surface of the sheet was completely wet and had a water absorption of 2.5%.

Example 3 In the same manner as in Example 2, 100 parts of polypropylene (Sumitomo Noblen FS1012, MI = 1.0, manufactured by Sumitomo Chemical Co., Ltd.)
Isobutylene-maleic anhydride copolymer salt (KI gel 20
A press sheet was prepared by press molding using 7 parts (1F, water absorption 200 g / g, manufactured by Kuraray Co., Ltd.).

As a result of the water immersion test, the entire surface of the press sheet was completely wet, and the water absorption was 1.6%.

Comparative Example 1. A press sheet was prepared in the same manner as in Example 2 except that Sumikagel R-30R was not added. As a result of the water immersion test, the wet surface of the press sheet was poor and a partially dried surface was formed, and the water absorption was 0.1%.

Comparative Example 2. A press sheet was prepared in the same manner as in Example 3 except that the salt of the isobutylene-maleic anhydride copolymer was not added. As a result of the water immersion test, the press sheet surface was poorly wet and a partially dry surface was formed, and the water absorption was 0.2%.

〔The invention's effect〕

In the present invention, by providing an opening on the air flow side front surface of the trapezoidal convex portion, the pressure loss can be reduced, the air flow can be mixed, and the contact between the air flow and the water or the solution at the concave surface portion can be achieved. When the filler is composed of a base material formed by mixing a non-water-absorbent resin and a water-absorbent resin, a uniform water film is formed over the entire surface of the filler, and a large air flow and The contact between the air flow and the water or the solution is made good, such as allowing long-term contact over the area, producing a sufficient evaporative effect and producing an extremely large cooling effect, thereby improving the heat transfer effect, Heat transfer and / or mass transfer is performed with high efficiency. Further, the latter filler can make the surface hydrophilic even when a small amount of the water-absorbing resin is used, and it is very economical as compared with the case where the whole filler is composed of the water-absorbing resin.

[Brief description of the drawings]

FIG. 1 shows a plate-shaped filler of the present invention in which trapezoidal convex portions are arranged in a zigzag pattern on both side surfaces, and openings are provided on the air flow side front surfaces of the convex portions. FIG. FIG. 3 shows a corrugated plate-shaped filler of the present invention composed of a water-absorbent resin and a base material obtained by mixing and molding the water-absorbent resin. FIG. 3 shows the staggered convex air portions shown in FIG. FIG. 4 is a table showing measurement results of the heat transfer performance of a cooling tower performed using a plate-shaped filler having an opening on the flow side front surface and a plate-shaped filler having no opening. FIG. 5 shows a conventional plate-like filler in which trapezoidal convex portions are arranged in a staggered manner, and FIG.
FIG. 6 shows a side view of the plate-like filler of FIG. 5 from the air flow side. DESCRIPTION OF SYMBOLS 1 ... Filler 2 ... Convex part 3 ... Air flow side front surface 4 ... Water flow 5 ... Air flow, 6 ... Opening 7 ... Water, 8 ... Water film

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Katsushi Jinno 3-7-17-1 Nittacho, Niihama-shi, Ehime Prefecture Inside Nissen Chemical Co., Ltd. (56) References JP-A-54-16761 (JP, A)

Claims (2)

(57) [Claims] The present invention relates to a packing material packed in a packed tower and used for heat and / or mass transfer between water or a water-based solution and air. An opening is provided on an airflow-side front surface of a trapezoidal convex portion of a plate-type filler having an uneven surface formed by a back surface of a portion. 2. A packing material packed in a packed tower and used for heat transfer and / or mass transfer between water or a water-based solution and air, wherein a non-water-absorbing resin and a water-absorbing resin are used. A filler characterized by comprising a mixed and molded base material.