JPH02207837A - Packing material - Google Patents

Abstract

PURPOSE:To reduce the pressure drop of the packing material and to improve its heat transfer and heat exchange performance by providing an opening on the front of the projecting part on the air flow side of the plate-type packing material having recessed and projection face, and forming the packing material with a mixture of water absorptive resin and non-water absorptive resin. CONSTITUTION:Air flow 5 flows obliquely forward from the right-hand side of the plate-type packing material 1, and the opening 6 is provided on the front 3 of the projecting part 2 on the air flow side. The packing material 1 is made of a base material obtained by forming a mixture of water absorptive resin and non-water absorptive resin. Since the opening 6 is provided on the front 3 of the projecting part 2 of the packing material 1 on the air flow side, a part of the air flow having collided with the front 3 passe through the opening 6 and sent to the rear, hence the pressure drop of the air flow is reduced, and the air flow entering the recessed face on the rear of the projecting part 2 is brought into sufficient contact with water or a soln. In addition, since the packing material 1 is made of a mixture of water absorptive resin and non-water absorptive resin, the surface is made hydrophilic, a water film is formed and held on the whole surface, and heat transfer or material transfer is efficiently performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to cooling towers, condensing groups, deodorizing towers, dust removal towers, etc.
, relates to a packing material packed in a packed column that performs heat transfer and/or mass transfer between water or a solution whose main solvent is water and air.

[Conventional technology]

Conventionally, in packed columns for heat transfer and/or mass transfer between gas and liquid, ball-shaped, rod-shaped,
Various shapes are possible, such as ring-shaped, saddle-shaped, and plate-shaped, and from among these, choose one that is suitable for the intended use and that increases the gas-liquid contact area and improves the gas-liquid contact efficiency. It is used. Among these, plate-shaped fillers are mainly used as fillers in cooling towers, etc.
For example, a large number of corrugated plate-like fillers 1 as shown in FIG. 4 are arranged parallel to each other at equal intervals and perpendicular to the horizontal plane. A water stream 4 is then flowed over this filler 1 from above.
flows down, and an air flow 5 passes between the filling materials 1 from below or from the side, and the air flow 5 comes into contact with the water 7 flowing down along the surface of the filling material 1, causing evaporation. ,
At this time, the latent heat of vaporization is removed and the water 7 is cooled and flows out from below. In this plate-shaped filler 1, 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, there are places where water is retained on the surface of the filler. In order to form the filling material, the surface of the plate-shaped filling material is made into a waveform as shown in FIG. 4, or the waveforms or trapezoids 2 are arranged in a staggered manner as shown in FIG. Providing an uneven surface on the surface is practiced.

In addition, conventionally, packing materials used in packed towers have been made of various materials such as stone, ceramics, metals, and synthetic resins. Synthetic resins, particularly thermoplastic synthetic resins, are used as base materials because they are lightweight, easy to mold and process.

[Problem to be solved by the invention]

In the prior art, plate-shaped filling materials with an uneven surface, such as the corrugated plate-shaped filling material shown in FIG. 4 or the plate-shaped filling material with a staggered wave pattern shown in FIG. By providing the uneven surface portion on the surface of the filler material, the uneven surface portion protrudes into the air flow passage area formed between the opposing filler surfaces and reduces the cross-sectional area of the air flow passage area. For the front surface, the projected area of the filling material is as shown in Figure 6, and the pressure loss is large (
Therefore, efficient heat transfer and/or mass transfer could not be performed.

In addition, thermoplastic synthetic resins that are conventionally used as materials for fillers are generally hydrophobic, and therefore fillers based on these resins repel water on the surface and are sufficient to cover the entire surface. The problem is that a water film cannot be formed and a partially dry surface is created, resulting in uneven heat transfer and/or mass transfer surface, and that heat exchange performance may not be sufficient. there were.

In other words, if the base material of the filler is made of thermoplastic resin in FIG. However, the problem is that the evaporation effect is not sufficient and the cooling effect is impaired.

The present invention solves the above-mentioned problems of the prior art, reduces pressure loss, promotes air flow mixing, improves heat transfer performance, and forms a water film on almost the entire surface of the filler to heat the filler. The object of the present invention is to provide a packing material for a packed column that has improved exchange performance and efficient heat transfer and/or mass transfer.

[Means to solve the problem]

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

As a means for solving the above-mentioned problems, the present invention provides a packing material that is packed in a packed column and that participates in heat transfer and/or mass transfer between water or a solution whose main solvent is water and air. , it is an object of the present invention to provide a filling material characterized in that an opening is provided on the air flow side front surface of a convex surface portion of a plate-type packing material having an uneven surface.

In addition, as a solution to this problem, the present invention provides a non-water-absorbing filling material that is packed in a packed column and participates in heat transfer and/or mass transfer between water or a solution containing water as the main solvent and air. The purpose of the present invention is to provide a filler characterized by being made of a base material formed by mixing a water-absorbing resin and a water-absorbing resin.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The filling material according to the present invention, in which an opening is provided on the air flow side front surface of the convex portion of the plate-type packing material having an uneven surface, will be described in detail below with reference to the drawings.

FIG. 1 shows an example in which the present invention is applied to a conventional plate-shaped packing material having a shape in which the waveforms shown in FIG. 5 are arranged in a staggered manner. 5 is flowing.

In the present invention, the air flow side front surface 3 of the convex surface portion 2 of the plate-shaped filler l refers to the surface of the side surface of the convex surface portion 2 that faces in the direction in which the air flow comes and is hit by the air flow 5. Since this surface becomes a resistance surface to the air flow, the pressure loss of the air flow is increased, but in the present invention, an opening 6 is provided on this surface 3. In FIG. 1, this surface 3 is shown by hatching.

It is usually preferable that this opening is not very large; it only needs to have a diameter of a few millimeters, and its shape can be round, square, triangular, etc., and is similar to what is called a hole. That's fine. It is not necessary to provide the openings on the entire front surface of the convex surface portion on the airflow side, and it is sufficient to provide the openings at considerable intervals. For example, in the plate-shaped filling material shown in Figure 1, the width of the top surface is 8 mm and the height is 5 mm.
When the substantially trapezoidal convex sections II are arranged in a staggered manner, holes with a diameter of 3 to 4 m may be provided on the front surface of every other convex section on the air flow side.

By providing this opening on the airflow-side front surface of the convex surface of the filler, a portion of the airflow that collides with the airflow-side front surface passes through the opening and escapes to the back surface. Therefore, the pressure loss of the airflow is reduced, and the airflow that passes through this opening enters the concave surface formed on the back surface of the convex surface, which is difficult for airflow to enter with conventional fillers. This improves the air flow and the water or solution, even on the concave surface.

It also allows for mixing of the airflow, resulting in a uniform flow of the airflow.

Further, when the present invention configures the filler with a base material formed by mixing a non-water-absorbing resin and a water-absorbing resin, the non-water-absorbing resin may include polypropylene, high-density polyethylene,
Polyvinyl chloride and the like are preferably used. These are typical thermoplastic resins that have been conventionally used to constitute fillers. In addition, water-absorbing resins to be mixed with this non-water-absorbing resin include polyethylene oxide, modified polyethylene oxide, and polyacrylic acid (salt).
Crosslinked products, salts of isobutylene-maleic anhydride copolymers, and the like are preferred.

The mixing ratio of this non-water-absorbing resin and water-absorbing resin varies depending on the usage, shape, usage conditions, etc. of the filler, but the content of the water-absorbing resin is such that at least the molded filler remains hydrophilic over a long period of time. The quantity shall be such that it has . For example, when polyethylene oxide is used as the water-absorbing resin, its content is 1 to 10%.

The filler is made of a base material made by mixing a non-water-absorbing resin and a water-absorbing resin.The surface of the filler is hydrophilic, and a water film is formed over a wide area over the entire surface of the filler, resulting in effective gas-liquid contact. can be performed to effect heat transfer and/or mass transfer.

For example, if a non-water-absorbing resin and a water-absorbing resin are uniformly mixed in powder form, placed in a mold, and molded under heat and pressure, the non-water-absorbing resin etc. will partially melt and the both resins will completely melt. A fused and integrated filling material can be obtained. The filling material is as shown in Fig. 2, which is the case of a corrugated plate.
Since the surface has a non-water-absorbing resin part and a water-absorbing resin part uniformly dispersed in fine particles, the whole becomes water-absorbing, that is, hydrophilic, and a water film is formed over the entire surface. Article becomes like this.

The filling material of the present invention, in which a water film is formed over the entire surface, can be used not only for cooling towers but also for condensing towers that cool and condense gas by the retained water film. It can also be applied to packing materials for packed towers such as dust removal towers and deodorization towers that remove dust or deodorize by wetting action with a water film.

The filler of the present invention, which is made of a base material formed by mixing a non-water-absorbing resin and a water-absorbing resin, can have a honeycomb shape, a ring shape, a saddle shape, etc. in addition to the above-mentioned plate shape. It can be made into various shapes such as
For applications such as cooling towers, a plate type or honeycomb shape is preferable. In the case of a plate-type shape, in addition to the waveform shown in FIG. 2, various shapes such as the waveform shown in FIG. 1 in which convex portions are arranged in a staggered manner can be used.

0 effect] In the packing material provided with the openings of the present invention, by having the openings on the front surface of the convex surface on the airflow side, a part of the airflow colliding with the front surface on the airflow side passes through the openings. Since the air flows out to the back surface, the abrasive resistance caused by the front surface on the airflow side is reduced, thereby reducing pressure loss.

In addition, the airflow passing through this opening enters the concave part formed on the back side of the convex part, which improves the difficulty of airflow entering the concave part when there was no opening. , even in the concave portion, good contact between the air flow and the water or solution takes place. And the mixing of airflow is also well done. Therefore, the overall efficiency of contact between the air flow and the water or solution is improved.

In addition, in the case of a filler made of a base material formed by mixing a non-water-absorbing resin and a water-absorbing resin of the present invention, minute non-water-absorbing resin parts and minute water-absorbing resin parts are uniformly dispersed on the surface. As a result, the entire surface becomes hydrophilic, a water film is widely maintained over the entire surface, and furthermore, a flowing water film is easily formed on the surface. Therefore, the air flow and the water or solution are well brought into contact with each other on the filler, and the contact efficiency is improved.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to Examples.

However, the present invention is not limited to these examples.

Example 1 High-density polyethylene (HIZEX, 5000S, MI
=0.8. 0.5m thick made by Mitsui Petrochemical Co., Ltd.
Press a sheet of
111 trapezoidal convex portions are formed in a staggered manner on both sides, and a plate-shaped filler is provided in every other convex portion with a hole having a diameter of 411I11 on the front surface on the air flow side. Manufactured. The packing materials were arranged vertically in parallel at intervals within the cooling tower. This cooling tower was operated and its heat transfer performance was measured.

For comparison, plate-shaped packing materials having the same shape but without the holes (openings) described above were arranged in a cooling tower and the heat transfer performance was measured.

The measurement results are shown in the diagram of FIG. Note that Ka is the enthalpy-based total volumetric heat conduction coefficient.

Example 2 A polyethylene oxide modified product (Sumikagel R-3OR1 with a water absorption rate of 30 g/g) was added to 100 parts of high-density polyethylene (Hyzex, 50005.MI=08, manufactured by Mitsui Petrochemicals) using an open roll method using a conventional method. After adding 5 parts of the mixture (manufactured by Sumitomo Chemical Co., Ltd.) and thoroughly mixing the mixture, a press sheet having a thickness of 01 m was prepared by press molding.

After this sheet was immersed in tap water at 20° C. for 24 hours, it was taken out and the wet state of the surface was observed. The entire surface of this sheet was completely wetted, and its water absorption rate was 2.5%.

Example 3゜In the same manner as in Example 2, polypropylene (Jumin Noblen FSIO12, MI=1.0, manufactured by Jumin Chemical ■) 100
%, isobutylene-maleic anhydride copolymer salt (Kl Gel 201F, water absorption rate 200 g/g, Kuraray ■
A press sheet was prepared by press molding using 7 parts of the product.

As a result of the water immersion test, the entire surface of the press sheet was completely wet, and its water absorption rate was 1. It was 6%.

Comparative Example 1 A press sheet was prepared in the same manner as in Example 2, except that Sumikagel R-3OR was not added. As a result of the water immersion test, the surface of the press sheet was poorly wetted, resulting in a partially dry surface, and its water absorption rate 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 surface of the press sheet was poorly wetted, resulting in a partially dry surface, and its water absorption rate was 0.2%.

〔Effect of the invention〕

In the present invention, by providing an opening on the front surface of the convex surface on the airflow side, pressure loss can be reduced and airflow can be mixed, and even in the concave surface, contact between the airflow and water or solution can be made. In addition, when the filler is composed of a base material formed by mixing a non-water-absorbing resin and a water-absorbing resin, a uniform water film is formed over the entire surface of the filler, and airflow and water are absorbed over a wide area. It enables long-term contact, produces sufficient evaporative action, and produces an extremely large cooling effect.
There is good contact between the air stream and the water or solution, which improves the heat transfer effect and provides a highly efficient heat and/or mass transfer. Furthermore, the latter filled base material can make its surface hydrophilic even if a small amount of water-absorbing resin is used, and is much more economical than a case where the entire filler is made of water-absorbing resin.

[Brief explanation of the drawing]

FIG. 1 shows a plate-shaped packing material of the present invention in which corrugated convex portions are arranged in a staggered manner on both sides, and openings are provided on the front surface of the convex portions on the air flow side. The corrugated plate-shaped filler of the present invention is made of a water-absorbing resin and a base material formed by mixing the water-absorbing resin. FIG. 4 is a chart showing the results of measurement of heat transfer performance of a cooling tower using a plate-shaped packing material with openings provided on the front side of the flow side and a plate-shaped packing material without such openings; , shows a conventional corrugated plate-shaped filling material, FIG. 5 shows a conventional plate-shaped filling material in which corrugated convex canes are arranged in a staggered manner, and FIG.
FIG. 6 shows a side view of the plate-shaped filler of FIG. 5 from the airflow side. l...Filling material 2...Convex portion 3・
... Air flow side front 4 ... Water diagram Air flow opening diagram Operation lII! ) Between (h) Figure Figure Figure Figure

Claims (2)

[Claims] (1) A plate-type packing material having an uneven surface is used as a packing material packed in a packed column and participating in heat transfer and/or mass transfer between water or a solution whose main solvent is water and air. A filler characterized by having an opening on the front surface of the convex portion on the airflow side. (2) A non-water-absorbing resin and a water-absorbing resin are used in the packing material that is packed in a packed column and participates in heat transfer and/or mass transfer between water or a solution whose main solvent is water and air. A filler characterized by being composed of a base material that is mixed and molded.