JP4660072B2 - Seawater strainer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seawater strainer having an antifouling function for preventing adhesion of marine organisms.
[0002]
[Prior art]
For example, in a nuclear power plant or the like, seawater taken from the sea is used as cooling water to be used in large quantities.
When seawater is used as cooling water, foreign substances typified by marine organisms such as mussels, barnacles, or seaweeds that are innumerable in seawater may adhere to the suction parts of heat exchangers and pumps that feed seawater. is there.
If these foreign substances adhere, the cooling system may be adversely affected, so a seawater strainer is provided at the intake of seawater to capture and remove the foreign substances.
[0003]
The structure of a conventional seawater strainer will be described with reference to FIG.
In FIG. 7, reference numeral 1 denotes a bottomed cylindrical filter body having a flange 1 a at one open end and the other end closed by a bottom plate 1 b, and 2 is a cylindrical body that houses the filter body 1. Openings 3a and 3b are formed at both ends along the flow, and flanges 4a and 4b are formed at the ends of these openings 3a and 3b, respectively. Reference numeral 5 denotes a cylindrical lid provided facing the opening 3a of the barrel 2, and flanges 6a and 6b are formed at both ends.
[0004]
The filter body 1 is housed in a cylinder 2, the flange 1 a is sandwiched between the flange 4 a of the cylinder 2 and the flange 6 a of the lid 5, and is tightened liquid-tightly by bolts 7 and nuts 8. Reference numeral 9 denotes a packing that maintains liquid tightness between the flanges 4a and 6a.
In addition, a lining 10 is applied to the contact surface between the trunk 2 and the seawater 17 on the inner surface of the lid 5 for the purpose of corrosion protection.
[0005]
The seawater strainer configured as described above is attached to a seawater intake port and the like, and the marine organisms present in the seawater are captured by the filter body 1 while the taken seawater flows through the lid 5, the filter body 1, and the trunk 2. ,Remove.
[0006]
Such a seawater strainer is provided with a spare device or a swirl flow so that foreign substances can be removed while operating the power plant when a heat exchanger or seawater pump needs to be operated continuously. In general, it has a cleaning function.
[0007]
However, since marine organisms attached to the filter body 1 of the seawater strainer grow after capture, there is a risk that the filter hole of the filter body 1 will be blocked, and the trapping of foreign substances, which is the original purpose, may not be sufficiently achieved. is there.
[0008]
In order to prevent this, it is necessary to replace the seawater strainer and frequently wash the seawater strainer. If the adhesion is significant, it cannot be removed by washing with a swirling flow, etc. Cleaning may be necessary.
[0009]
Conventionally, as an antifouling measure for preventing or removing excessive adhesion of these marine organisms, there is a means of introducing hydrogen peroxide into the seawater. However, this method is not an antifouling measure for a seawater strainer alone, but rather an antifouling measure for a heat exchanger or a seawater pump downstream of the seawater strainer.
We are also considering antifouling measures for the entire seawater flow path of the cooling system by introducing hydrogen peroxide into the seawater from upstream of the seawater strainer.
[0010]
Although this method exhibits an effective antifouling function, it is difficult to control the amount and concentration of hydrogen peroxide due to the large amount of seawater environment, and it is likely to become an excessive concentration because a reliable antifouling effect is expected. There is a risk that the heat exchange performance of the pump may be reduced, or the pump efficiency may be reduced.
Further, when used in a pump lubricating water facility, there is a risk of insufficient lubrication at the sliding portion of the bearing or gland.
[0011]
In addition, additional equipment such as a hydrogen peroxide tank and injection device is required, which increases the cost of the equipment, and it is necessary to periodically replace the hydrogen peroxide tank, so that maintenance is troublesome. is there.
[0012]
On the other hand, as another antifouling measure, a means of applying a silicon-based antifouling paint for preventing marine organisms from adhering to the lining of the seawater strainer in contact with seawater is also considered. (For example, refer to Patent Document 1).
[0013]
However, the antifouling effect of this silicone-based antifouling paint is that the antifouling effect decreases over time, the antifouling life is shortened due to the contact of foreign matters such as shells, the construction cost is high, and it is easy to add to existing facilities. There are disadvantages such as lack of construction means, and the antifouling effect decreases when the flow of seawater is stopped. In fact, the seawater strainer cannot be expected to be very effective.
Moreover, since the structure of a filter body using a punching plate or a woven mesh is complicated, no antifouling measures are taken on the structure at present.
[0014]
[Patent Document 1]
JP 2001-115427 A (page 3, description of paragraph numbers [0006] and [0007])
[0015]
[Problems to be solved by the invention]
As mentioned above, in the conventional seawater strainer, since the surface of the filter body 1 becomes a local stagnation part with respect to the flow of seawater, marine organisms adhere and it is in an environment where it is easy to grow.
[0016]
However, the conventional anti-fouling measures for seawater strainers that introduce hydrogen peroxide into seawater are considered as antifouling measures for the entire system, so not only the equipment becomes larger, but also existing plants such as heat exchangers and seawater pumps. Worried about adverse effects on the performance and soundness of the equipment and adverse effects on the environment, it requires a heavy burden on control and management.
Also, antifouling measures for seawater strainers using silicon-based antifouling paints are not effective measures, and the effect cannot be expected much.
[0017]
The present invention was made to solve the above-mentioned problems of the prior art, eliminates adverse effects on other devices and the environment by easy means, and reliably captures marine organisms that are excessively attached and grown, The object is to obtain a seawater strainer with an antifouling function that can be removed.
[0018]
[Means for Solving the Problems]
In order to solve the above-mentioned object, the invention according to claim 1 is formed in a bottomed cylindrical shape having a flange at an open end, takes in seawater and captures marine organisms in seawater, The filter body is accommodated , and a conductive cylinder having openings at the upstream and downstream sides of the seawater flow and having a flange at the upstream opening is provided opposite to the opening of the cylinder, and the filter body is accommodated. A conductive lid having openings on the upstream and downstream sides of the seawater flow and having a flange on the downstream opening, and an electrochemically active and stable electrocatalyst coated on the surface of the filter body And an insulator that electrically insulates the filter body and the cylinder at a connecting flange portion sandwiching the flange of the filter body between the cylinder and the lid flange, a positive electrode is connected to the filter body, and a negative electrode is connected to the cylinder . Set to a value that generates oxygen while suppressing the generation of chlorine in seawater. Characterized by comprising the an external DC power source for supplying the potentials between the positive electrode and the negative electrode.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiment, the same parts as those of the conventional seawater strainer shown in FIG.
[0022]
FIG. 1 is a view showing a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a filter body made of, for example, a punching plate or a conductor having a woven mesh structure, and its inner and outer surfaces are electrochemical. It is electrically coated with an active and stable electrocatalyst 11.
[0023]
As the electrocatalyst 11, for example, a single body, a mixed crystal body, or a composite body including at least one of a platinum-based metal, a platinum-based metal oxide, and an oxide of cobalt or manganese can be used.
[0024]
The flange 1a of the filter body 1 is sandwiched between the flange 4a of the body 2 made of a conductor and the flange 6a of the lid 5 through insulating packings 12a and 12b, and is liquidated by bolts 7 and nuts 8 made of an insulator. It is tightly tightened.
Therefore, the filter body 1, the body 2, and the lid 5 are completely electrically insulated by the insulating packings 12 a and 12 b, the bolts 7, and the nuts 8.
[0025]
Reference numeral 13 denotes an external DC power source, the positive electrode 13 a is electrically connected to the flange 1 a of the filter body 1, the negative electrode 13 b is electrically connected to the body 2, and the verification electrode 13 c is electrically connected to the lid 5. . Alternatively, the negative electrode 13 b may be electrically connected to the lid 5 and the verification electrode 13 c may be electrically connected to the body 2.
[0026]
The external DC power supply 13 is provided with an automatic potential control device 13d that automatically controls the potential between the positive electrode 13a and the negative electrode 13b.
The positive electrode 13a may be connected to the electric catalyst 11 covering the filter body 1 instead of the flange 1a of the filter body 1.
[0027]
According to the present embodiment configured as described above, the filter body 1 is applied by the action of the electric catalyst 11 covering the filter body 1 by applying a potential between the positive electrode 13 a and the negative electrode 13 b of the external DC power supply 13. Oxygen is generated on the surface, and marine organisms attached to and grown on the surface of the filter body 1 can be removed.
[0028]
The potential between the positive electrode 13a and the negative electrode 13b is controlled to a value that generates oxygen while suppressing the generation of chlorine by an automatic potential control device 13d provided in the external DC power supply device 13, and considers the influence on the environment. Yes.
[0029]
According to the present embodiment, it is possible to prevent and remove marine organisms by generating oxygen from the surface of the filter body 1 without affecting the performance, health and environment of the heat exchanger and seawater pump. A seawater strainer with an antifouling function can be realized simply by having an external DC power supply.
[0030]
Next, a second embodiment of the present invention will be described with reference to FIG.
In FIG. 2, the lining 10 is given to the contact surface of the trunk | drum 2 and the seawater 17 of the lid | cover 5 for the purpose of corrosion prevention. A filter body 1 made of a punching plate or a woven mesh structure is electrically coated with an electrochemically active and stable electrocatalyst 11 on the inner and outer surfaces thereof.
[0031]
The flange 1a of the filter body 1 is sandwiched between the flange 4a of the body 2 made of a conductor and the flange 6a of the lid 5 through insulating packings 12a and 12b, and is tightened in a liquid-tight manner by bolts 7 and nuts 8. Yes.
In this case, the packings 12a and 12b, the bolt 7 and the nut 8 may not be insulators.
[0032]
Electrodes 14a and 14b penetrating through the body 2 and the lining 10 and contacting the seawater 17 are attached to the body 2 via insulators 15a and 15b, and are completely electrically insulated from the filter body 1.
[0033]
The positive electrode 13 a of the external DC power supply 13 is electrically connected to the flange 1 a of the filter body 1, the negative electrode 13 b is electrically connected to one electrode 14 b attached to the cylinder 2, and the verification electrode 13 c is attached to the cylinder 2. The other electrode 14a is electrically connected.
[0034]
The electrodes 14a and 14b may be provided on the lid 5.
Further, the positive electrode 13 a may be connected to the electric catalyst 11 covering the filter body 1 instead of the flange 1 a of the filter body 1.
[0035]
Further, as shown in FIG. 3, the electrode bodies 14a, 14b are fastened with bolts 7 and nuts 8 made of an insulating material between the cylinder 2 and the flanges 4a, 6a of the lid 5 via insulating packings 16a, 16b, 16c. Anyway. In this case, the electrodes 14a and 14b, the filter body 1, the body 2 and the lid 5 are completely electrically insulated.
[0036]
Furthermore, as shown in FIG. 4, the flange 1a of the filter body 1 is sandwiched between a flange 4a of the body 2 made of a conductor through insulating packings 12a and 12b and a flange 6a of the lid 5, and is made of an insulator. The bolts 7 and nuts 8 may be tightened in a liquid-tight manner, and the electrodes 14a and 14b may be directly attached to the trunk 2 or the lid 5 so as to be in contact with the seawater 17 without using an insulator.
[0037]
The positive electrode 13 a of the external DC power supply 13 is electrically connected to the flange 1 a of the filter body 1, the negative electrode 13 b is electrically connected to the electrode 14 b attached to the body 2, and the verification electrode 13 c is attached to the lid 5. It is electrically connected to the electrode 14a.
[0038]
In the present embodiment configured as described above, the surface of the filter body 1 is applied by the action of the electric catalyst 11 covering the filter body 1 by applying a potential between the positive electrode 13 a and the negative electrode 13 b of the external DC power supply 13. In this case, oxygen is generated, and marine organisms attached and grown on the surface of the filter body 1 can be removed.
[0039]
The potential between the positive electrode 13a and the negative electrode 13b is controlled to a value that generates oxygen while suppressing the generation of chlorine by an automatic potential control device 13d provided in the external DC power supply device 13, and considers the influence on the environment. Yes.
[0040]
Next, a third embodiment of the present invention will be described with reference to FIG.
In the present embodiment, the inner and outer surfaces of the filter body 1 made of a conductor, the contact surface with the seawater 17 of the trunk 2 made of a conductor, and the seawater 17 of the lid 5 made of a conductor Is electrically coated with an electrochemically active and stable electrocatalyst 11.
[0041]
The flange 1a of the filter body 1 is sandwiched between the flange 4a of the barrel 2 and the flange 6a of the lid 5 through insulating packings 12a and 12b, and is tightened liquid-tightly by bolts 7 and nuts 8. In this case, the bolt 7 and the nut 8 may not be insulators.
[0042]
The body 2 is provided with electrode bodies 14a and 14b that are in contact with the seawater 17. The electrode bodies 14a and 14b are provided with insulators 15a and 15b that are electrically insulated from the filter body 1 and the body 2, and the filter body 1. Fully electrically isolated.
[0043]
The positive electrode 13 a of the external DC power supply 13 is electrically connected to the flange 1 a of the filter body 1, the negative electrode 13 b is electrically connected to one electrode 14 b attached to the cylinder 2, and the verification electrode 13 c is attached to the cylinder 2. The other electrode 14a is electrically connected.
[0044]
The electrodes 14a and 14b may be provided on the lid 5.
Further, the positive electrode 13 a may be connected to the electric catalyst 11 covering the filter body 1 instead of the flange 1 a of the filter body 1.
[0045]
Further, as shown in FIG. 6, the electrode bodies 14a, 14b are fastened with bolts 7 and nuts 8 made of an insulating material between the cylinder 2 and the flanges 4a, 6a of the lid 5 via insulating packings 16a, 16b, 16c. Anyway. In this case, the electrodes 14a and 14b, the filter body 1, the body 2 and the lid 5 are completely electrically insulated.
[0046]
In this embodiment configured as described above, an electric potential is applied between the positive electrode 13 a and the negative electrode 13 b of the external DC power supply 13, and the electric catalyst 11 that covers the filter body 1, the body 2, and the lid 5 acts. Oxygen is generated at the contact surface between the filter body 1, the trunk 2 and the seawater 17 of the lid 5, and traps marine organisms attached and grown on the contact surface between the filter body 1, the trunk 2 and the seawater 17 of the lid 5, Can be removed.
[0047]
The potential between the positive electrode 13a and the negative electrode 13b is controlled to a value that generates oxygen while suppressing generation of chlorine by an automatic potential control device 13c provided in the external DC power supply device 13, and considers the influence on the environment. Yes.
[0048]
【The invention's effect】
As described above, according to the present invention, it is provided with an antifouling function that can eliminate the adverse effects on other equipment and the environment with easy means, and can reliably capture and remove marine organisms that are excessively attached and grown. A seawater strainer can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a seawater strainer according to a first embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing a seawater strainer according to a second embodiment of the present invention.
FIG. 3 is a schematic sectional view showing a modification of the seawater strainer according to the second embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view showing another modification of the seawater strainer according to the second embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view showing a seawater strainer according to a third embodiment of the present invention.
FIG. 6 is a schematic sectional view showing a modification of the seawater strainer according to the third embodiment of the present invention.
FIG. 7 is a schematic cross-sectional view showing a conventional seawater strainer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Filter body, 2 ... Body, 4a, 4b ... Flange, 5 ... Cover, 6a, 6b ... Flange, 7 ... Bolt, 8 ... Nut, 10 ... Lining, 11 ... Electrocatalyst, 12a, 12b ... Insulation packing, 13 ... External DC power supply, 14a, 14b ... Electrode, 15a, 15b ... Insulator, 16a, 16b, 16c ... Insulating packing, 17 ... Seawater.

Claims (2)

Was formed into a bottomed cylindrical shape having a flange on the open end, the filter body of conductive capturing marine organisms in seawater intake seawater, and housing the filter body, upstream and downstream of the seawater flow A conductive cylinder having a flange in the upstream opening and a flange formed in the upstream opening, and provided opposite to the opening of the cylinder , accommodating the filter body, and forming openings on the upstream and downstream sides of the seawater flow A conductive lid having a flange on the downstream side opening, an electrochemically active and stable electrocatalyst coated on the surface of the filter body , and a connection flange sandwiching the flange of the filter body between the flange of the body and the lid An insulator that electrically insulates the filter body and the cylinder in the section, a positive electrode is connected to the filter body, a negative electrode is connected to the cylinder, and generates oxygen while suppressing generation of chlorine in seawater. External DC power that applies a set potential between the positive and negative electrodes Seawater strainer consisting of. The seawater strainer according to claim 1 , wherein the filter body and the body are electrically insulated from each other by an insulating packing, an insulating bolt and an insulating nut of the connecting flange portion.

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