JP2001115427A - Anti-fouling device of structure in contact with sea water, and its performance degradation monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-fouling device of a structure in contact with sea water, and its performance degradation monitoring method to surely and easily understand the presence or absence of generation and locations of problems attributable to a secular or external factor such as an anode forming member and an electrical catalyst. SOLUTION: An anode side conductive body 4 is provided on a tube plate 2a of a heat exchanger 2 via an insulating adhesive 3. The anode side conductive body 4 comprises an anode forming member 5 and the electric catalyst 6 covered on the anode forming member 5. A cathode side conductive body 8 is provided on a side wall of a water chamber 13. An external DC power source 7 controls the electric potential of a energization circuit formed between a positive pole 7a and a negative pole 7b so as to generate oxygen without substantially generating chlorine gas in sea water 15 via the electrical catalyst 6. A current monitoring device 9 monitors the current flowing in the anode side conductive body elements 4a and 4b. A judging device 10 judges the durable condition (integrity and performance degradation) of the anode side conductive bodies 4a and 4b based on the output data (a change in the cumulative current value and the current value) from the current monitoring device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifouling device for a seawater contact structure for preventing the attachment of marine organisms to a seawater contact structure that comes into contact with seawater, and more particularly, to an antifouling device on a seawater side surface of a seawater contact structure. The present invention relates to an antifouling device for a seawater contact structure which suppresses the adhesion of marine organisms to the seawater contact structure by generating oxygen via an electric catalyst provided in the seawater contact structure, and a performance deterioration monitoring method thereof.

[0002]

2. Description of the Related Art In a power plant that takes in seawater as cooling water, mussels, barnacles, hydro worms, etc. are placed on a tube plate of a heat exchanger (support members located at the inlet and outlet of a heat transfer tube).
Organisms such as seaweed (hereinafter referred to as "marine organisms") may adhere. These marine organisms obstruct the passage of the cleaning sponge by blocking the tube end of the heat transfer tube, or block the inner surface of the heat transfer tube. For this reason, such power plants often have to be shut down to remove these marine organisms. Note that these marine organisms are more likely to adhere to the seawater-resistant titanium tubesheet or heat transfer tube than the copper alloy tubesheet or heat transfer tube.

[0003] In such a power plant, larval marine creatures that have passed through a strainer net may be formed on the side wall of a steel water chamber installed above the heat exchanger. Since the surface of such a steel water chamber is usually provided with a rubber lining or the like, marine organisms that have formed on the side wall of the water chamber drop off after growing for a certain period of time on the side wall of the water chamber. In addition, the tube end and the inner surface of the heat transfer tube located below the water chamber are closed.

[0004] Conventionally, as an antifouling measure for extermination of these marine organisms and prevention of adhesion, a method using a toxic substance effective for antifouling of marine organisms has been proposed. Such methods include, for example, charging chlorine or chlorine compounds into the seawater withdrawn, applying an antifouling paint containing a toxic ion generating pigment to a tube plate or a heat transfer tube of a heat exchanger, or electrolyzing seawater. For producing toxic ions such as chlorine and copper.

[0005] However, in the method using toxic substances, although the antifouling itself is effectively performed, it is not easy to control the amount and concentration of toxic substances such as chlorine in a large amount of seawater.
Generally, it is easy to set the amount, concentration and the like excessively in expectation of a reliable antifouling effect, and as a result, there is a high possibility of causing environmental pollution. In addition, the use of such toxic substances themselves is being banned or suppressed today.

For this reason, development of non-polluting and non-toxic antifouling measures has recently been promoted by many researchers and engineers. Specifically, for example, silicone-based antifouling paints are attracting attention as antifouling paints which are non-polluting and non-toxic, but exhibit an effective antifouling effect. Has been proposed.

However, the method using the silicone-based antifouling paint has the following disadvantages in the silicone-based antifouling paint itself: the antifouling life is shortened by contact of foreign substances such as shells, and the construction cost is high. There are no simple and easy construction methods for large-area objects and existing facilities, and there are drawbacks such as the reduction of the antifouling effect when the flow of seawater is stopped. Has not been reached.

[0008] On the other hand, as an antifouling measure other than the above-mentioned method, Japanese Patent Publication No. 46595/94 and Japanese Patent Application No. Hei 10-2710 / 1994 have been proposed.
The technique described in Japanese Patent No. 92142 is also known.

Among them, the technique described in Japanese Patent Publication No. 46595/1994 is based on the method of mainly forming a mixed crystal of a platinum group metal or a platinum group metal and an oxide of these metals on the surface of a titanium member which comes into contact with seawater. This is a method to generate sufficient oxygen without forming chlorine gas substantially by forming an electrocatalytic film consisting of a mixture with Deposition can be suppressed.

[0010] By the way, in the heat exchanger in which such antifouling measures are taken, generally only the heat transfer tube and the tube plate are made of titanium, and the main body, the water chamber, and the water conduit for guiding seawater to the heat exchanger. The discharge pipe for returning seawater to the sea is a steel member. Also,
The titanium members such as the heat transfer tube and the tube sheet and the steel members such as the water chamber, the water pipe and the water discharge pipe are electrically connected.

For this reason, when an electric catalyst is formed on the surface of a titanium member in contact with seawater to act as an anode, as in the method described in Japanese Patent Publication No. 4-46595, the titanium member Steel members, such as a water chamber, a water pipe, and a water discharge pipe, which are in communication with each other, are also loaded as anodes. Then, in this state, when steel members such as the water chamber, the water pipe, and the water discharge pipe come into contact with seawater, the surface of the steel member is severely corroded by galvanic corrosion. In addition,
Since the surface of the steel member is usually provided with rubber lining etc. to prevent corrosion, such a situation does not occur under normal use conditions, but if the rubber lining etc. is broken for any reason In this case, electric current may flow into the seawater through the damaged portion, and steel members such as the water-ice chamber, the water pipe, and the water discharge pipe may be abnormally corroded.

Incidentally, abnormal corrosion caused by such damage of the rubber lining or the like can usually be avoided by adopting the cathodic protection method and electrically lowering the steel member to the corrosion protection potential of the steel material. However, the above-mentioned
In the method described in Japanese Patent No. 46595, a titanium member is loaded as an anode, and a steel water chamber, a water pipe, a water discharge pipe, and the like that are connected to the titanium member are also loaded as an anode. The law cannot be adopted.

On the other hand, the above-mentioned Japanese Patent Application No. Hei 10-29214 is disclosed.
The technique described in Japanese Patent Publication No. 2
In order to solve the disadvantage of the method described in Japanese Patent No. 46595/1992, an anode forming member and an electric catalyst are provided on a titanium tube sheet of a heat exchanger via an insulating adhesive, and the electric catalyst is used. In this method, sufficient oxygen is generated without substantially generating chlorine gas through the gas. By this, temporarily
Even if the rubber lining that protects the steel member that conducts with the titanium tube sheet breaks for some reason, it is possible to electrically lower the steel member to the corrosion protection potential of the steel material by adopting the cathodic protection method, It is possible to prevent abnormal corrosion of steel members such as a water chamber, a water pipe, and a water discharge pipe.

[0014]

However, according to the method described in Japanese Patent Application No. 10-292142,
Since it is not possible to sufficiently grasp the durable states (soundness and performance degradation, etc.) of the anode forming member and the electric catalyst, the following problems occur due to temporal or external factors.

First, when the anode forming member and the electrocatalyst are used for a long period of time, the performance of the anode forming member and the electrocatalyst deteriorates. May cause.

Second, when the insulating adhesive deteriorates,
The electrical insulation between the anode forming member and the titanium tube sheet or the like is broken, resulting in the same problem as the method described in Japanese Patent Publication No. 46595/94. In other words, when the electrical insulation between the anode forming member and the titanium tube sheet or the like is broken, if the rubber lining or the like that protects the steel member that conducts with the titanium tube sheet or the like is broken for any reason. ,
Electric current flows into the seawater through the damaged portion, and there is a possibility that steel members such as a water chamber, a water pipe, and a water discharge pipe may be abnormally corroded, and there is a problem in reliability.

Third, a conductive foreign substance (eg, a wire) floating in seawater happens to be caught on the entrance of the heat transfer tube of the heat exchanger, and the anode forming member and the heat transfer tube (ie, a titanium tube plate)
In the case where と is conducted, exactly the same situation as when the above-mentioned insulating adhesive is deteriorated may occur, and there is a problem in reliability.

Fourth, when the anode forming member and the electrocatalyst have a large area, where the performance degradation of the large area anode forming member and the electrocatalyst etc. is occurring, In addition, it is difficult to identify where the deterioration of the insulating adhesive is occurring, and further, approximately where the conductive foreign matter is caught at the entrance of the heat transfer tube, etc., and once a failure occurs, All the anode forming members, the electric catalysts, and the like must be renewed, so that there is a problem that the cost of maintenance management such as repair and renewal becomes enormous.

The present invention has been made in view of the above points, and it is possible to reliably and easily determine whether or not there is a problem due to aging or external factors such as an anode forming member and an electrocatalyst, and a location thereof. It is an object of the present invention to provide an antifouling device for a seawater contacting structure and a method for monitoring the performance deterioration thereof, which can grasp and grasp the attachment of marine organisms and abnormal corrosion of steel members that come into contact with seawater beforehand. I do.

[0020]

A first solution is to provide an antifouling device for a seawater contact structure which suppresses the formation of marine organisms on the seawater contact structure. An anode-side conductor provided via an insulating portion, and an anode-side conductor having an electrochemically active electrocatalyst,
A cathode-side conductor provided in seawater, an external power source having a positive electrode connected to the anode-side conductor and a negative electrode connected to the cathode-side conductor, wherein the electric power of the anode-side conductor is An external power supply that controls a potential between the positive electrode and the negative electrode so as to generate oxygen in seawater via a catalyst, a current monitoring device that monitors a current flowing through the anode-side conductor, and the current monitoring device. A determination device for determining a durable state of the anode-side conductor based on a monitoring result, the antifouling device for a seawater contact structure.

Here, in the above-mentioned first solution, the anode-side conductor comprises a plurality of anode-side conductor elements insulated from each other, and the current monitoring device flows through each of the anode-side conductor elements. It is preferable to monitor the current respectively. Further, it is preferable that the determination device determines a durable state of the anode-side conductor based on an integrated current value or a change in the current value monitored by the current monitoring device. Further, the determination device relatively compares the change in the current value monitored by the current monitoring device between the anode-side conductor elements, and considers the comparison result for each anode-side conductor element. It is preferable to determine the durable state of each of the anode-side conductor elements based on a change in a current value. Note that the insulating portion is an insulating adhesive for bonding the seawater-side surface of the seawater contact structure and the anode-side conductor to each other, the seawater-side surface of the seawater contact structure and the anode-side conductor. It is preferable that the insulating sheet is provided between the insulating sheet and the insulator coated on the seawater side surface of the seawater contact structure. Also,
The electrocatalyst of the anode-side conductor is preferably a single body, a mixed crystal or a composite containing at least one of a platinum-based metal, a platinum-based metal oxide, and an oxide of cobalt or manganese.

[0022] A second solution is a method for monitoring the performance deterioration of an antifouling device for a seawater contact structure, which suppresses the adhesion of marine organisms to the seawater contact structure. By passing a current between the anode-side conductor provided through the insulating portion and the cathode-side conductor provided in seawater, an electrochemically active electrocatalyst of the anode-side conductor is provided. Generating oxygen in seawater via the method, monitoring the current flowing through the anode-side conductor during the oxygen generation step, and using the anode-side conductor based on the monitoring result of the monitoring step. And determining the performance degradation.

Here, in the above-described second solution, the anode-side conductor is composed of a plurality of anode-side conductor elements that are insulated from each other, and flows in each of the anode-side conductor elements in the monitoring step. It is preferable to monitor the current respectively. Further, it is preferable that in the determining step, the durable state of the anode-side conductor is determined based on the integrated current value or the change in the current value monitored in the monitoring step. Further, it is preferable that, in the determining step, when a rapid increase in the current value is monitored in the monitoring step, it is determined that the anode-side conductor has a possibility of insulation failure. Furthermore, in the determining step, after determining that there is a possibility of insulation failure in the anode-side conductor, wait for a predetermined time to elapse, or reverse the flow direction of seawater with respect to the seawater contact structure. It is preferable to determine again whether there is insulation failure of the anode-side conductor.

Further, it is preferable that, in the determining step, when a sudden decrease in the current value is detected in the monitoring step, it is determined that the anode-side conductor may be peeled or partially damaged. . In the determination step, the change in the current value monitored in the monitoring step is relatively compared between the respective anode-side conductor elements, and the comparison is performed for each of the anode-side conductor elements while considering the comparison result. It is preferable to determine the durable state of each of the anode-side conductor elements based on a change in a current value.

According to the above-described first and second means, the current flowing through the anode-side conductor is monitored, and based on the integrated current value of the current flowing through the anode-side conductor or a change in the current value, the anode-side conductivity is monitored. Life state of the body (health and performance deterioration, etc.)
Therefore, the useful state of the anode-side conductor can be reliably grasped, and the adhesion of marine organisms due to the performance deterioration of the anode-side conductor can be prevented. Also, due to the insulation failure phenomenon that occurs when the insulating part is deteriorated, or when a conductive foreign substance floating in seawater is caught on the seawater contact structure,
It is possible to prevent abnormal corrosion or the like of the steel member coming into contact with seawater.

The anode-side conductor has a large area by dividing the anode-side conductor into a plurality of anode-side conductor elements that are insulated from each other and monitoring the current flowing through each anode-side conductor element. In this case, it is possible to easily identify where the performance degradation of the large-area anode-side conductor has occurred, and to perform maintenance management such as repair and renewal easily and inexpensively. it can.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing an embodiment of an antifouling device for a seawater contact structure according to the present invention. As shown in FIG. 1, an antifouling device 1 for a seawater contact structure is for suppressing the formation of marine organisms on a titanium heat exchanger (seawater contact structure) 2 in contact with seawater 15. Yes, anode-side conductor 4,
A cathode-side conductor 8, an external DC power supply (external power supply) 7, a current monitoring device 9, and a determination device 10 are provided. The heat exchanger 2 includes a titanium tube sheet 2a and a plurality of titanium heat transfer tubes 2b supported by the tube sheet 2a. The heat exchanger 2 has a rubber lining 11 on its inner surface.
A water chamber 13 made of steel is provided.

As shown in FIG. 1, the seawater 15 of the heat exchanger 2
On the substantially entire surface of the tube sheet 2a located on the side surface, an anode-side conductor 4 is provided via an insulating adhesive (insulating portion) 3. The anode-side conductor 4 has an anode forming member 5 having a thickness of 0.1 to 0.3 mm, and an electric catalyst 6 coated on the anode forming member 5. Among them, the electrocatalyst 6 is an electrochemically active and stable catalyst, is coated on the anode forming member 5 in advance by a catalyst coating process, and is heated at 350 to 450 ° C. for several hours by electric resistance heating or the like. And heat-activated. The electric catalyst 6
For example, a single body, a mixed crystal body, or a complex body containing at least one of a platinum-based metal, a platinum-based metal oxide, and an oxide of cobalt or manganese can be used.

Further, the insulating adhesive 3 and the anode-side conductor 4 have a plurality of openings corresponding to the diameters of the plurality of heat transfer tubes 2b. The anode-side conductor 4 is composed of a plurality of anode-side conductor elements 4a and 4b (anode forming member elements 5a and 5b and electrocatalyst elements 6a and 6b) that are insulated from each other. The body elements 4a, 4b are insulated from each other via an insulating adhesive 17. In addition, as an insulation method between the adjacent anode-side conductor elements 4a and 4b, other than this, the anode-side conductor elements 4a and 4b may be overlapped with each other via an insulating member, or a range in which an antifouling effect is obtained. For example, a method of separating the anode-side conductor elements 4a and 4b from each other by a predetermined distance can be used.

On the other hand, on the side wall of the water chamber 13 provided in the heat exchanger 2, the cathode-side conductor 8 and the reference electrode 12 are provided so as to project from the rubber lining 11 toward the seawater 15.

Here, the anode-side conductor 4 and the cathode-side conductor 8 are respectively connected to a positive electrode 7 of an external DC power supply (external power supply) 7.
a and the negative electrode 7b. In addition, reference electrode 1
2 is connected to the reference pole 7r of the external DC power supply 7. The anode-side conductor 4 includes a plurality of anode-side conductor elements 4a, 4a.
b, the anode-side conductor elements 4a, 4b
A corresponding positive electrode 7a is provided for each. The external DC power supply 7 has a built-in automatic potential control unit 7c, and generates a positive electrode so as to generate oxygen without substantially generating chlorine gas in seawater 15 via the electric catalyst 6 of the anode-side conductor 4. 7
The potential of an energizing circuit formed between a and the negative electrode 7b can be controlled. The specific potential value of the energizing circuit formed between the positive electrode 7a and the negative electrode 7b is lower than a chlorine generation potential (SCE) of 1.13 V for generating chlorine gas in standard seawater, and A value higher than the oxygen generation potential of 0.52 V for generating oxygen is used. The specific current value of the energizing circuit formed between the positive electrode 7a and the negative electrode 7b is as follows.
Although there is a slight difference depending on the type, usually 0.3 to 3.0
A value of about A / m ² is used. The potential value of the reference electrode 12 is used to calibrate the automatic potential control unit 7c with the potential of the seawater 15.

A current monitoring device 9 is connected to each positive electrode 7a of the external DC power supply 7, and each of the anode-side conductor elements 4
The currents flowing through a and 4b can be monitored respectively.

Further, the current monitoring device 9 includes a determination device 10
Is connected, and based on output data from the current monitoring device 9 (integrated current value or change in current value of the current flowing through each anode-side conductor element 4a, 4b), each anode-side conductor element 4a, 4b is The durable state (soundness, performance degradation, etc.) can be determined. The determination device 10 relatively compares the change in the current value monitored by the current monitoring device 9 between the anode-side conductor elements 4a and 4b, and considers each anode-side conductor element while considering the comparison result. 4a, 4b
Each anode-side conductor element 4
The useful states of a and 4b are determined. The result of the judgment by the judging device 10 is output to the external DC power supply 7 and is used for interrupting the current supply from the external DC power supply 7 to each of the anode-side conductor elements 4a and 4b.

Next, the operation of the present embodiment having such a configuration will be described.

In FIG. 1, a current flows between the anode-side conductor 4 (the anode forming member 5 and the electric catalyst 6) and the cathode-side conductor 8 via an external current power supply 7. At this time, under the control of the automatic potential control unit 7c of the external DC power supply 7, the potential between each anode-side conductor element 4a, 4b and the cathode-side conductor 8 is in the range of 0.52 to 1.13V. The current value is maintained at about 0.3 to 3.0 A / m ² . This makes it possible to generate oxygen without substantially generating chlorine gas in the seawater 15 via the electric catalyst 6, and to attach marine organisms to the tube plate 2a and the heat transfer tube 2b of the heat exchanger 2. Life can be prevented.

At this time, each anode-side conductive element 4a, 4b
The current flowing through each of the anode-side conductive elements 4a, 4b is monitored by a current monitoring device 9, and based on the integrated current value or the change in the current value of the current flowing through each of the anode-side conductive elements 4a, 4b. (Eg, soundness and performance degradation) are determined.

FIG. 2 is a diagram for explaining a specific determination method in the determination device 10 shown in FIG.

As shown in FIG. 2, the determination device 10 first takes in the output data from the current monitoring device 9 and calculates the integrated current value or the change in the current value of the current flowing through each of the anode-side conductor elements 4a and 4b. (Step 10
1).

Next, it is determined whether or not the integrated current value of the current flowing through each of the anode-side conductive elements 4a, 4b exceeds a predetermined value (step 102).
If any of b has an integrated current value of a current flowing therethrough exceeding a predetermined value, the electric catalysts 6a and 6b of the corresponding anode-side conductor elements 4a and 4b are exhausted. Is determined (step 103).

Here, since the respective electrocatalyst elements 6a and 6b of the respective anode-side conductor elements 4a and 4b are dissolved and consumed in proportion to the integrated current value, the amount of consumption with respect to the integrated current value is determined by the thickness of the electrocatalyst. By converting the value into the size (μm), the consumption life of each of the electrocatalytic elements 6a and 6b can be calculated (see FIG. 3). Specifically, for example, when the electric catalyst is a cobalt-based catalyst, the amount of consumption with respect to the integrated current value can be predicted to be 520 mg / A · year, and the thickness of the electric catalyst is set to 0.5 μm. , The integrated current value is 16.7
A. You can see that it is worn out beyond the year. In addition,
In this case, when the current is continuously supplied at a current value of 1.0 A / m ² , the power is consumed in about 8 years. Therefore, by setting the predetermined value in step 102 in consideration of such a consumption life, it is possible to appropriately determine the consumption state of each of the electric catalysts 6a and 6b.

On the other hand, if it is determined in step 102 that the integrated current value of the current flowing through each anode-side conductive element 4a, 4b does not exceed the predetermined value, step 10
Proceeding to the process of 4, it is checked whether or not the change in the value of the current flowing through each of the anode-side conductor elements 4a, 4b exceeds a predetermined range.

In step 104, if any of the anode-side conductor elements 4a, 4b has a change in the value of the current flowing therethrough exceeding a predetermined range, the process proceeds to step 105. Then, it is further determined whether or not the change in the value of the current flowing through each of the anode-side conductor elements 4a and 4b is time-dependent. On the other hand, each anode-side conductor element 4
If the change in the current value flowing through a and 4b is within the predetermined range, the process returns to step 101, and the above-described process is repeated.

If it is determined in step 105 that the change in the value of the current flowing through the corresponding anode-side conductor element 4a, 4b is temporal, the corresponding anode-side conductor element 4a, 4b is determined. It is determined that the anode forming members 5a and 5b have deteriorated in performance (step 106).

Here, when the performance of each anode forming member 5a, 5b of each anode-side conductor element 4a, 4b deteriorates, the potential between each anode-side conductor element 4a, 4b and the cathode-side conductor 8 is reduced. The current value required to maintain the predetermined value decreases (see FIGS. 4A and 4B). Therefore, by monitoring the change in the value of the current flowing through each of the anode-side conductor elements 4a, 4b, it is possible to appropriately determine the performance degradation of each of the anode forming members 5a, 5b. Each anode forming member 5
When the current value decreases due to the deterioration of the performance of the a and 5b, the amount of oxygen generated from each of the electrocatalytic elements 6a and 6b decreases in proportion to the decrease, so that the antifouling effect itself against marine organisms naturally decreases. become. Specifically, the current value flowing through each anode-side conductor element 4a, 4b is 1/5 to 1/1 of the initial value.
When the current value decreases to about 10, each anode forming member 5
It is preferable to determine that a and 5b have deteriorated in performance. At this time, the value of the current flowing through each of the anode-side conductor elements 4a and 4b may fluctuate due to external factors such as the state of seawater, for example, red tide or inflow of contaminated seawater. The change in the current value obtained is relatively compared between the anode-side conductor elements 4a and 4b, and based on the change in the current value for each anode-side conductor element 4a and 4b while taking into account the comparison result. It is preferable to determine the performance deterioration of each of the anode forming members 5a and 5b of the anode-side conductor elements 4a and 4b.

On the other hand, if it is determined in step 105 that the change in the value of the current flowing through the corresponding anode-side conductor elements 4a, 4b is not temporal,
7, the corresponding anode-side conductor elements 4a, 4b
It is determined whether or not the value of the current flowing through the device has rapidly increased (step 107).

In step 107, when a sudden increase in the value of the current flowing through the corresponding anode-side conductor element 4a, 4b is detected, the corresponding anode-side conductor element 4a, 4b is detected.
It is determined that there is a possibility that the anode forming members 5a and 5b of b have insulation failure (step 108).

Here, a sharp increase in the value of the current flowing through each anode-side conductive element 4a, 4b may be caused by deterioration of the insulating adhesive 3 or by conductive foreign matter (for example, wire) floating in the seawater 15. This is an insulation failure phenomenon caused when the anode forming member elements 5a, 5b and the heat transfer tube 2b (that is, the tube sheet 2a) are electrically connected to each other by being caught at the entrance of the heat transfer tube 2b or the like.
The determination can be made by monitoring the change in the value of the current flowing through each of the anode-side conductor elements 4a and 4b. However, in the latter case, the conductive foreign matter (for example, wire) floating in the seawater 15 is often caught temporarily at the entrance of the heat transfer tube 2b and then flows out.

Therefore, each of the anode-side conductor elements 4a, 4b
When a rapid increase in the value of the current flowing through the anode side is detected, a change in the current value is detected after elapse of a predetermined time, and the insulation of each anode forming member element 5a, 5b of each anode side conductor element 4a, 4b is detected. The presence or absence of a defect may be determined again. Specifically, as shown in FIGS. 5 (a) and 5 (b), each of the anode-side conductor elements 4a, 4b
It is determined that there is a possibility of insulation failure, and the current supply to the anode-side conductor elements 4a and 4b is temporarily interrupted (time A). The current supply to each anode-side conductor element 4a, 4b is restarted. At this time, if a rapid increase in the current value is not detected, it is determined that there is no possibility of insulation failure of the anode-side conductor elements 4a and 4b (see FIG. 5A). On the other hand, if the current value sharply increases again, it is determined that there is a possibility of insulation failure of each anode-side conductor element 4a, 4b, and each anode-side conductor element 4a, 4b is determined at the timing of time C. The current supply to the power supply is interrupted (see FIG. 5B).

The conductive foreign matter (for example, wire) floating in the seawater 15 often flows out when the flow direction of the seawater 15 is reversed, so that each anode-side conductive element 4a, 4b
When a sudden increase in the value of the current flowing through
The flow direction of the seawater 15 with respect to the heat exchanger 2 may be reversed, and the presence or absence of insulation failure of each anode-side conductor element 4a, 4b may be determined again.

On the other hand, if it is detected in step 107 that the current value flowing through the corresponding anode-side conductor element 4a, 4b is sharply reduced, the corresponding anode-side conductor element 4a, 4b is detected.
It is determined that there is a possibility that the corresponding anode-side conductor elements 4a, 4b may be peeled or partially damaged due to dents, abrasion, or the like (step 1).
09).

As described above, according to the present embodiment, the current flowing through the anode-side conductor 4 is monitored by the current monitoring device 9,
Since the use state (soundness and performance degradation, etc.) of the anode-side conductor 4 is determined by the determination device 10 based on the integrated current value of the current flowing through the anode-side conductor 4 or a change in the current value,
It is possible to reliably grasp the durable state of the anode-side conductor 4 and prevent marine organisms from adhering and abnormal corrosion of a steel member (such as the water chamber 13) that comes into contact with the seawater 15 beforehand. Specifically, for example, by determining the consumption state of the electric catalyst 6 based on the integrated current value of the current flowing through the anode-side conductor 4,
Performance degradation when the electric catalyst 6 is used for a long time can be predicted beforehand, and adhesion of marine organisms due to the performance deterioration of the electric catalyst 6 can be prevented. In addition, by determining the performance deterioration of the anode forming member 5 based on the change in the value of the current flowing through the anode-side conductor 4, it is possible to predict the performance deterioration when the anode forming member 5 is used for a long time. In addition, it is possible to prevent marine organisms from adhering due to performance deterioration of the anode forming member 5. Further, based on a change in the value of the current flowing through the anode-side conductor 4 (a sharp increase in the current value), when the insulating adhesive 3 is deteriorated, or when a conductive foreign substance (for example, a wire or the like) floating in the seawater 15 is removed. It is possible to prevent abnormal corrosion of the steel member (the water chamber 13 and the like) that comes into contact with the seawater 15 by reliably grasping the presence or absence of the insulation failure that occurs when the heat transfer tube 2b is caught at the entrance or the like. Furthermore, the peeling or partial breakage of the anode-side conductor 4 is reliably determined on the basis of a change in the value of the current flowing through the anode-side conductor 4 (a sharp decrease in the current value). Flows out and heat exchanger 2 and water chamber 13
Can be effectively prevented.

According to the present embodiment, the anode-side conductor 4 is provided with a plurality of anode-side conductor elements 4a,
4b, and the current monitoring device 9 monitors the current flowing through each of the anode-side conductor elements 4a and 4b. Therefore, the anode-side conductor 4 (the anode forming member 5 and the electric catalyst 6) has a large area. In this case, where the performance degradation of the large-area anode forming member 5 and the electric catalyst 6 is occurring, where the degradation of the insulating adhesive 3 is occurring, and It is possible to easily specify the approximate location where the foreign matter is caught at the entrance of the heat transfer tube 2b and the like, and it is possible to easily and inexpensively perform maintenance management such as repair and updating.

Further, according to the present embodiment, the change in the current value is relatively compared between the respective anode-side conductive elements 4a and 4b, and the respective anode-side conductive elements 4a and 4b are considered in consideration of the comparison result.
The useful state of each of the anode-side conductive elements 4a and 4b is determined based on the change in the current value for each of the anodes 4a and 4b. The durable state of the side conductor 4 can be accurately determined.

Further, according to the present embodiment, when a sharp increase in the value of the current flowing through the anode-side conductor 4 is detected, a change in the current value is detected after a predetermined time has elapsed.
Since the presence / absence of insulation failure of the anode forming member 5 of the anode-side conductor 4 is determined again, the insulation failure in the case where the conductive foreign matter floating in the seawater 15 is temporarily caught by the inlet of the heat transfer tube 2b and then flows out. Malfunction can be prevented.
At this time, by reversing the flow direction of the seawater 15 before again judging the presence / absence of insulation failure of the anode forming member 5 of the anode-side conductor 4, conductive foreign substances floating in the seawater 15 can be effectively removed. Can be drained.

According to the present embodiment, the anode forming member 5 coated with the electric catalyst 6 in advance is bonded on the tube sheet 2a at room temperature via the insulating adhesive 3.
350 required for the catalytic activity of the electrocatalyst 6
Heat resistance heating treatment at ~ 450 ° for several hours
It is not necessary to perform the above, and the danger that the tube sheet 2a is damaged due to generated heat, thermal stress or the like can be effectively avoided.

In the above-described embodiment, the anode-side conductor 4 is provided on the tube sheet 2a of the heat exchanger 2 via the insulating adhesive 3, but as shown in FIG. The insulating sheet 18 may be arranged between the conductive adhesive 3 and the anode-side conductor 4. Thereby, electrical insulation between the tube sheet 2a and the anode-side conductor 4 can be firmly realized. In this case, the tube sheet 2a and the insulating sheet 18
And between the insulating sheet 18 and the anode-side conductor 4 need not necessarily have insulating properties.

In the above-described embodiment, the anode-side conductor 4 is provided on the tube sheet 2a of the heat exchanger 2. However, the present invention is not limited to this. The anode-side conductor 4 may be provided on the body. Specifically, for example, as shown in FIG. 7, the anode-side conductor 4 is provided via an adhesive 16 on a rubber lining (insulator) 11 provided on the surface of a water chamber 13 which is a seawater contact structure. be able to. Further, as shown in FIG. 8, the anode-side conductor 4 can be provided via an adhesive 16 on a concrete intake channel 14 which is a seawater contact structure.
In addition, in the case shown in FIG. 8, the reinforcing reinforcing bar (part of which is in contact with the seawater 15) of the cooling seawater intake concrete intake channel 14 functions as the conductor 8. In each case shown in FIGS. 7 and 8, since the rubber lining 11 and the concrete intake channel 14 have insulating properties, the adhesive 16 itself does not need to have insulating properties. The anode-side conductor 4 is similarly formed on various insulators such as resin materials provided in the seawater contact structure, not limited to the rubber lining 11 and the concrete intake channel 14 shown in FIGS. 7 and 8. It is possible to provide.

[0059]

As described above, according to the present invention, the current flowing through the anode-side conductor is monitored, and based on the integrated current value of the current flowing through the anode-side conductor or a change in the current value, the anode-side conductor is monitored. Since the service life (health and performance degradation, etc.) of the anode is determined, the service life of the anode-side conductor must be ascertained to prevent marine organisms from adhering due to the performance deterioration of the anode-side conductor. Can be. In addition, abnormal corrosion of steel members that come into contact with seawater, etc. due to insulation failure phenomena that occur when the insulating part has deteriorated, or when conductive foreign matters floating in seawater are caught on the seawater contact structure, etc. Can be prevented.

The anode-side conductor has a large area by dividing the anode-side conductor into a plurality of anode-side conductor elements that are insulated from each other and monitoring the current flowing through each anode-side conductor element. In this case, it is possible to easily identify where the performance degradation of the large-area anode-side conductor has occurred, and to perform maintenance management such as repair and renewal easily and inexpensively. it can.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an antifouling device for a seawater contact structure according to the present invention.

FIG. 2 is a flowchart for explaining a performance deterioration monitoring method for antifouling equipment purchase of the seawater contact structure shown in FIG. 1;

FIG. 3 is a view for explaining a method of determining a consumption state of an electric catalyst in the antifouling device for a seawater contact structure shown in FIG. 1;

FIG. 4 is a view for explaining how to determine the performance deterioration of the anode forming member in the antifouling device for a seawater contact structure shown in FIG. 1;

FIG. 5 is a view for explaining how to determine the anode forming member when a rapid increase in the current value is detected in the antifouling device for a seawater contact structure shown in FIG. 1;

FIG. 6 is a schematic diagram showing a modification of the antifouling device for the seawater contact structure shown in FIG. 1;

FIG. 7 is a schematic view showing another modification of the antifouling device for the seawater contact structure shown in FIG. 1;

FIG. 8 is a schematic view showing still another modified example of the antifouling device for the seawater contact structure shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antifouling apparatus of seawater contact structure 2 Heat exchanger 2a Tube plate 2b Heat transfer tube 3 Insulating adhesive (insulating part) 4 Anode side conductor 5 Anode forming member 6 Electric catalyst 7 External direct current power supply (External power supply) 7a Positive electrode 7b Negative electrode 7r Reference electrode 7c Automatic potential control unit 8 Cathode-side conductor 9 Current monitoring device 10 Judgment device 11 Rubber lining (insulator) 12 Reference electrode 13 Water chamber 14 Concrete intake channel (insulator) 15 Seawater 16 Adhesive 17 Insulating adhesive 18 Insulating sheet (insulating part)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Sakurada 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Keihin Works, Toshiba Corporation (72) Inventor Shoji Nakajima Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa 2-4-4 Toshiba Keihin Works Co., Ltd. (72) Inventor Akinori Nagata 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Keihin Works Co., Ltd. (72) Inventor Tadahiko Oba Chuo-ku, Tokyo 2-5-2, Shinkawa F-term in Nakabo Tech Co., Ltd. 4D061 DA09 DB03 EA02 EB01 EB04 EB14 EB30 EB31 EB33 EB37 EB39 EB40 GA12 GC11 4K021 AA01 DA13 DC15 4K062 AA10 DA10 EA05 FA01 FA16 FA18

Claims (18)

[Claims] An antifouling device for a seawater contact structure, which suppresses the formation of marine organisms on the seawater contact structure, comprising: an anode provided on a seawater side surface of the seawater contact structure via an insulating portion. A conductor, an anode-side conductor having an electrochemically active electrocatalyst, a cathode-side conductor provided in seawater, and a cathode connected to the anode-side conductor and the cathode-side An external power supply in which a negative electrode is connected to a conductor, wherein the external power supply controls an electric potential between the positive electrode and the negative electrode so as to generate oxygen in seawater via the electric catalyst of the anode-side conductor. A current monitoring device that monitors a current flowing through the anode-side conductor; and a determination device that determines a durable state of the anode-side conductor based on a monitoring result by the current monitoring device. Antifouling equipment for seawater contact structures. 2. The anode-side conductor comprises a plurality of anode-side conductor elements insulated from each other, and the current monitoring device monitors a current flowing through each of the anode-side conductor elements. Item 2. An antifouling device for a seawater contact structure according to Item 1. 3. The protection of a seawater contact structure according to claim 1, wherein said judging device judges a durable state of said anode-side conductor based on an integrated current value monitored by said current monitoring device. Dirty equipment. 4. The seawater contact structure according to claim 1, wherein the determination device determines a durable state of the anode-side conductor based on a change in a current value monitored by the current monitoring device. Antifouling equipment. 5. A method according to claim 1, wherein said determining means relatively compares a change in the current value monitored by said current monitoring device between said anode-side conductor elements, and considers each of said anode-side conductors in consideration of the comparison result. 3. The useful state of each of the anode-side conductor elements is determined based on a change in a current value of each element.
An antifouling device for a seawater contact structure as described in the above. 6. The seawater contact structure according to claim 1, wherein the insulating portion is an insulating adhesive for bonding the seawater surface of the seawater contact structure and the anode-side conductor to each other. Antifouling device for things. 7. The seawater contact structure according to claim 1, wherein the insulating portion is an insulating sheet disposed between the seawater-side surface of the seawater contact structure and the anode-side conductor. Antifouling equipment. 8. The antifouling device for a seawater contact structure according to claim 1, wherein the insulating portion is an insulator coated on a seawater side surface of the seawater contact structure. 9. The electrocatalyst of the anode-side conductor is a single body, a mixed crystal or a composite containing at least one of platinum-based metals, platinum-based metal oxides, and oxides of cobalt or manganese. The antifouling device for a seawater contact structure according to claim 1, wherein: 10. A method for monitoring deterioration of performance of an antifouling device for a seawater contact structure, which suppresses the formation of marine organisms on the seawater contact structure, the method comprising the steps of: By providing a current between the provided anode-side conductor and the cathode-side conductor provided in seawater, seawater is supplied via an electrochemically active electrocatalyst having the anode-side conductor. Generating oxygen in the step of: monitoring the current flowing through the anode-side conductor during the oxygen generation step; and determining the durable state of the anode-side conductor based on the monitoring result of the monitoring step. A performance deterioration monitoring method, comprising: 11. The anode-side conductor comprises a plurality of anode-side conductor elements insulated from each other, and in the monitoring step, a current flowing through each of the anode-side conductor elements is monitored. Item 13. The performance deterioration monitoring method according to Item 10. 12. The performance deterioration monitoring method according to claim 10, wherein in the determining step, the service life of the anode-side conductor is determined based on the integrated current value monitored in the monitoring step. 13. The performance deterioration monitoring method according to claim 10, wherein in the determining step, the service life of the anode-side conductor is determined based on a change in the current value monitored in the monitoring step. 14. In the determining step, when a rapid increase in the current value is monitored in the monitoring step, it is determined that there is a possibility of insulation failure of the anode-side conductor. 13. The performance deterioration monitoring method according to item 13. 15. In the determining step, after determining that there is a possibility of insulation failure of the anode-side conductor, after a predetermined time has passed, it is determined again whether or not the anode-side conductor has insulation failure. The performance degradation monitoring method according to claim 14, wherein: 16. In the determining step, after it is determined that the anode-side conductor may have insulation failure, the flow direction of seawater to the seawater contact structure is reversed, and 15. The performance deterioration monitoring method according to claim 14, wherein the presence / absence of insulation failure is determined again. 17. The method according to claim 17, wherein, when a rapid decrease in the current value is detected in the monitoring step, it is determined that the anode-side conductor may be peeled or partially damaged. 14. The performance degradation monitoring method according to claim 13, wherein 18. In the determining step, a change in the current value monitored in the monitoring step is relatively compared between the respective anode-side conductor elements, and the respective anode-side conductors are considered in consideration of the comparison result. 12. The performance deterioration monitoring method according to claim 11, wherein a service life of each of the anode-side conductor elements is determined based on a change in a current value of each element.