JP2592384Y2 - Liquid collection structure in packed tower - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a collector installed in a lower portion of a packed column filled with various packing materials such as, for example, an ion exchange resin, activated carbon, or a filtering material such as sand or anthracite. The present invention relates to a liquid structure, particularly to a liquid collecting structure suitable for an ion exchange resin tower installed in a power plant or the like.

[0002]

2. Description of the Related Art In a power plant or the like, steam after driving a turbine for power generation is cooled and condensed, and impurities such as ions and suspended solids contained in the condensate are condensed and desalted. Power generation is performed in a cycle in which the condensate is removed by an apparatus and the treated condensate is heated again to convert it into steam. The condensate desalination apparatus used for such a condensate treatment includes a plurality of water towers for treating a condensate by filling a mixed ion exchange resin of a cation exchange resin and an anion exchange resin, and treating the condensate. It generally comprises a regeneration tower for taking out and separating and regenerating the used mixed ion exchange resin in the water tower. In both the water tower and the regeneration tower (hereinafter, both of which are collectively referred to as an ion exchange resin tower or simply a resin tower), a liquid collecting means is provided at a lower portion in the tower, and the liquid collecting means is provided. 0.3-1.1 in the resin tower
In order to prevent the ion-exchange resin having a particle size of about mm from flowing out of the resin tower, a liquid-collecting means which forms a liquid-collecting means with a screen made of a synthetic fiber or the like having openings that are not capable of passing the ion-exchange resin. It is wound around the outer periphery of the tube to prevent the fine ion exchange resin from flowing out of the column.

FIGS. 6 and 7 are schematic sectional views showing a conventional ion-exchange resin tower (water-flow tower).
Is a tower main body filled with the ion exchange resin 22, 23 is a supply pipe for the water to be treated attached to the upper part of the tower main body 21, 24
Is a distributor connected to the supply pipe 23 and has a function of evenly distributing the water to be treated in the tower body 21. Reference numeral 25 denotes a ring-shaped liquid collecting pipe provided in a multi-stage shape at the lower part in the tower main body 21, and a plurality of through holes 26 for taking in treated water into the liquid collecting pipe 25 are formed on the lower surface of the liquid collecting pipe 25. Has been drilled. In the drawing, reference numeral 27 denotes an ion exchange resin inlet provided at the upper part of the tower main body 21, reference numeral 28 denotes an ion exchange resin outlet provided at the lower surface of the tower main body 21, and reference numeral 29 denotes a liquid collecting pipe through the through hole 26. 25 shows discharge pipes for discharging the treated water into the outside of the resin tower. In such a conventional ion exchange resin tower, the collecting tube 25
In order to prevent the ion exchange resin 22 having a fine particle diameter from entering the through hole 26, a screen 30 made of synthetic fiber or the like is wound around the liquid collection tube 25 so that the fine ion exchange resin They are trying not to leak.

[0004]

As described above, conventionally, a screen made mainly of synthetic fibers or the like is wound around a liquid collecting tube to prevent fine ion exchange resin from being taken into the liquid collecting tube. ing. However, according to this method, since the screen is wound around the outer periphery of the annular collection tube, the outer circumference and the inner circumference of the collection tube have different lengths. There is a problem that considerable skill is required to wind this evenly, and a great deal of time is required for the work. Further, in the case of using the conventional screen, there is a drawback that the ion exchange resin is clogged in the mesh of the screen and a distribution failure is easily caused. Furthermore, it is necessary to periodically rewind the screen in order to cope with clogging and thread breakage due to the aging of the screen, and the rewinding work involves removing the liquid collection tube and attaching it after winding. However, there is a problem that a large amount of cost is required for repair and maintenance. Therefore, in the present invention, instead of the conventional synthetic fiber screen, a wedge-wire-type metal screen having a slit that allows a liquid to pass through but does not allow a filler such as an ion-exchange resin to pass is provided on the lower surface side of the liquid collecting tube. It is another object of the present invention to provide a liquid collecting structure in a packed tower that solves the above-mentioned conventional problems.

[0005]

Means for Solving the Problems] If detailing the structure of school proposed for achieving the above object, is arranged in a lower portion of the packed tower made by filling a filler such as ion exchange resins and activated charcoal Cut out almost half of the annular liquid collection tube, and in the notch,
A liquid collection structure in a packed tower, wherein a wedge-wire-shaped metal screen having a small gap through which a liquid can pass but a packing does not pass is joined.

When the liquid collecting structure of the present invention is applied to, for example, the above-described ion exchange resin tower, fine ion exchange resin is blocked by the slits of the wedge wire type metal screen, and the inside of the liquid collecting tube is prevented. In addition to solving the original problem that the ion exchange resin flows out of the resin tower without being able to enter the resin tower, the metal screen is highly reliable, and the thread breaks like the conventional screen. There is an advantage that there is no danger of causing a trouble, and permanent use is possible, and repair and maintenance costs as in the related art are not required. In addition, the opening of the wedge wire type screen has fine slits on the surface that do not allow the ion exchange resin to pass through, and the internal space has a shape that expands in a tapered shape. It is possible to obtain the operation and effect that the clogging is difficult and the flow of the processing liquid is smooth.

Hereinafter, the specific structure of the liquid collecting structure in the packed tower of the present invention will be described in detail based on reference examples and examples shown in the drawings . FIG. 1 is a schematic sectional view showing an ion exchange resin tower provided with a liquid collecting structure of a reference example , and FIG. 2 is an annular liquid collecting plate provided with a wedge wire type metal screen which is a main part of the reference example . FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2, and FIG. 4 is an enlarged sectional view taken along line BB of FIG. FIG. 5 shows an alternative to the annular collecting tube of the reference example.
It is a sectional view showing a Atsumarieki構Concrete made of the present invention to be needed.
Although FIG. 1 shows a water-flow tower as an example, it goes without saying that this can be replaced with a separation / regeneration tower.

In FIG. 1, reference numeral 1 denotes a tower main body filled with an ion exchange resin 2, reference numeral 3 denotes a supply pipe for a liquid to be treated attached to an upper portion of the tower main body 1, and reference numeral 4 denotes a distributor connected to the supply pipe 3. It functions to disperse the water to be treated in the main body 1. Reference numeral 5 denotes an annular liquid collecting pipe provided in three stages at a lower portion in the tower main body 1, and a plurality of through holes for taking in the processing liquid into the liquid collecting pipe 5 are provided on the lower surface side of each of the liquid collecting pipes 5. 6 are drilled. Reference numeral 7 denotes an inlet of the ion exchange resin provided on the upper part of the tower body 1, 8 denotes an outlet of the ion exchange resin provided on the lower surface of the tower body 1, and 9 denotes a processing liquid which has entered the liquid collecting pipe 5. Each shows a discharge pipe for discharging to the outside.

This reference example relates to a liquid collecting structure particularly suitably applied to such an ion exchange resin tower, and is provided on a lower surface side of a liquid collecting pipe 5 disposed at a lower portion in the tower main body 1. A wedge-wire-type metal screen 10 having a small gap enough to allow a liquid to pass therethrough but not a filler such as an ion exchange resin is covered. As shown in FIGS. 2 and 4, the wedge wire type metal screen 10 has a small gap 12 that allows liquid to pass through the surface of the long wire 11 having a wedge-shaped cross section but does not allow ion exchange resin to pass through. In this manner, for example, the support screen 13 is wound in a coil shape, and a plurality of support rods 13 are welded inside in a direction orthogonal to the wires 11 so that the narrow gap 12 on the surface side of the metal screen 10 is retained. This is curved at substantially the same curvature as that of the liquid collection tube 5, and the cylindrical metal screen 10 is divided in half in the horizontal direction, and the entire peripheral portion of the metal screen 10 is formed by the liquid collection tube 5. It is attached to the lower surface by welding or other fixing means. Reference numerals 14 and 15 in the drawing denote attachment pieces attached to the peripheral portion of the metal screen 10 divided in half.
Reference numerals 4 and 15 are used when the metal screen 10 is attached to the outer peripheral portion of the liquid collecting tube 5 by a fixing means such as welding. The inner space of the metal screen 10 is in a tapered shape because the cross section of the wire 11 is wedge-shaped, but a slit of about 0.2 to 0.3 mm appears on the surface side, and a fine particle size is reduced. The passing of the ion exchange resin is blocked.
In the illustrated reference example , the annular liquid collecting tube 5 is divided into four parts in the circumferential direction, and each end face is connected by a flange (not shown) to form an annular shape. A discharge pipe 9 for discharging the processing liquid to the outside of the tower body 1 is connected to an appropriate portion of the annular liquid collection pipe 5.

In the reference example shown in FIGS. 2 to 4, the wedge wire type metal screen 1 is provided on the lower surface side of a liquid collecting tube 5 having a large number of through holes 6 for taking in a processing liquid.
It has a liquid collecting structure mounted so as to cover 0 . this
Liquid collecting structure embodiments of the present invention which is shown in Figure 5 with respect to the notch substantially lower half of the liquid collecting tube 5 an annular horizontally, the metallic screen 10 of the wedge wire type to the cutout portions 16 We are trying to join . Liquid collection structure of this embodiment
Also in this case, it is possible to effectively prevent the filler such as the ion exchange resin from entering the liquid collecting tube 5 .

[0011]

[Effects of the Invention] The liquid collecting structure of the packed tower of the present invention has the above-mentioned structure, and the packing such as ion exchange resin is blocked by the slits of the wedge wire type metal screen, and the inside of the liquid collecting tube is prevented. In addition to solving the original problem that the packing material flows out of the resin tower without being able to enter the resin tower, the metal wedge wire type screen is used unlike the conventional synthetic fiber screen, so reliability is improved High, without the risk of thread breakage as in the past,
It has the effect of being able to be used permanently and not requiring repair and maintenance costs as in the past. In addition, the openings of the wedge wire type metal screen are formed such that fine slits on the surface do not allow a filler such as ion exchange resin to pass therethrough, and the internal space expands in a tapered shape. Therefore, the filler is not easily clogged, and the flow of the processing liquid is smoothed. In addition, the liquid collecting structure of the present invention is not limited to the ion exchange resin tower as described above, and can be applied to an activated carbon adsorption tower filled with granular activated carbon, a filtration tower filled with a filtering material such as sand, anthracite, and the like. Needless to say.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an ion exchange resin tower to which a liquid collecting structure of a reference example is applied.

FIG. 2 is a partial plan view of an annular liquid collection tube provided with a wedge wire type metal screen, which is a main part of the reference example .

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 2;

5 is a cross-sectional view showing the actual施例of the present invention the liquid-collecting structure.

FIG. 6 is a schematic sectional view showing an example of an ion exchange resin tower provided with a conventional liquid collecting tube.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

[Explanation of symbols]

1: Tower main body 2: Ion exchange resin 3: Supply pipe 4: Distributor 5: Liquid collecting pipe 6: Through hole 7: Input port 8: Discharge port 9: Discharge pipe 10: Wedge wire type metal screen 11: Wire 12: Narrow gap 13: Support rod 14: Mounting piece 15: Mounting piece 16: Notch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI C02F 1/42 (58) Investigated field (Int.Cl. ⁶ , DB name) B01J 8/02 B01D 24/38 B01D 29/88 B01D 39/12 B01J 47/02 C02F 1/42

Claims (1)

(57) [Scope of request for utility model registration] 1. A substantially lower half of an annular collecting pipe provided at a lower portion of a packed tower filled with a filler such as an ion-exchange resin or activated carbon, and a liquid is passed through the cutout. A liquid collecting structure in a packed tower, wherein a wedge-wire-type metal screen having a small gap through which the packing does not pass is joined.