JP3549092B2 - Method and apparatus for suppressing marine organism adhesion and growth - Google Patents

Description

[0001]
INDUSTRIAL APPLICABILITY The present invention suppresses sea organisms such as shellfish from adhering and growing inside water pipes, especially sea water intake pipes for taking in seawater, and also inhibits sea organisms from adhering and growing on sea water pipes that suppress seawater corrosion of carbon steel and the like. The present invention relates to a method and an apparatus.
TECHNICAL FIELD OF THE INVENTION
[0002]
In power plants and industrial plants located in coastal areas, it is common to use seawater as cooling water for equipment.
Seawater is taken in from the intake and sent to each facility. At this time, organisms of a certain size such as fish and jellyfish can be prevented from entering by the screen installed at the intake of the intake. However, it is difficult for this screen to prevent the invasion of small marine organisms such as shellfish, and as a result, shellfish etc. adhere and grow inside the intake pipe, causing a problem in water supply due to blockage inside the pipe. I have.
[0003]
Under such circumstances, large-diameter pipes capable of separating attached sea creatures are currently being removed at the time of plant periodic inspection. Requires a great deal of labor, and it is desired to improve such a situation.
In addition, in the case of small-diameter pipes where it is difficult to remove attached sea organisms, pipe replacement is inevitable.
[0004]
Meanwhile, on the other hand, various methods have been attempted to address the above-mentioned problems and to suppress the attachment and growth of sea organisms to these seawater pipes. Chlorination has been commonly used.
Chlorination kills marine life by injecting harmful chlorine into seawater, and has been widely used as an inexpensive and effective method.
However, in recent years, there has been a concern that constantly injecting chlorine, which is a harmful substance, into seawater may have an adverse effect on the environment and ecosystem, and reduction of the concentration of injected chlorine has been studied.
[0005]
As a method of avoiding the direct injection of chlorine, a method of applying a conductive coating on the inner surface of a pipe and using the conductive coating itself as an electrode to generate chlorine or a chlorine compound by electrolysis of seawater is being studied.
However, this method is also concerned with the impact on the environment and ecosystem as in the case of the conventional chlorine injection method in terms of the final use of chlorine, and also involves high cost problems such as maintenance due to energization and deterioration of the conductive coating. Have. In addition, there is also a problem that the conductive coating treatment is difficult to apply to small-diameter piping because the coating operation itself is difficult for small-diameter piping.
[0006]
Although the above is the most typical conventional technique, various other methods are being studied. For example, there are methods such as injection of iron sulfate ions and development of metal copper lining piping. However, the injection of iron sulfate ions injects a chemical substance like chlorine injection, so there is a concern about the effect on the environment.In addition, metal copper lining piping uses the sterilization effect of copper, but copper It has problems such as new corrosion damage due to low seawater corrosion resistance and the cost of replacing existing pipes, so it is not in a situation where it can be applied to plants.
[0007]
[Problems to be solved by the invention]
Based on the situation of the prior art as described above, in response to those various problems, the present inventors do not use a chemical substance that is concerned about adverse effects on the environment, and also paint existing piping requiring maintenance, Studying the means of suppressing the attachment and growth of marine organisms to seawater pipes, as a necessary condition that no replacement is performed, and as a result, it is found that magnetism is effective in suppressing the attachment and growth of marine organisms Reached.
[0008]
Current science does not yet fully elucidate the effects of magnetism on the life of living organisms, and thus the theoretical mechanism of the effects of magnetism on marine life is unknown. However, as a result of an experiment on the growth of marine organisms in seawater subjected to magnetic treatment, it was found that magnetically treated seawater suppressed the attachment and growth of marine organisms.
[0009]
The present invention uses the magnetism based on such knowledge, thereby satisfying the above-described requirements, without affecting the environment, and eliminating the need for painting or replacing existing pipes, thereby reducing the cost of seawater. It is an object of the present invention to provide means for suppressing sea organism adhesion and growth on piping.
[0010]
[Means for Solving the Problems]
That is, the feature of the fit present invention the above object, first, essentially, to intake seawater from one end, in sea water piping system that releases from the other end, the seawater at least a pair of rod-shaped permanent magnet in the pipe In this case, the north pole and the south pole are arranged so as to match each other along the flow direction, and the seawater passing between the magnetic poles is subjected to magnetic treatment.
[0011]
Claims 2 to 4 are embodiments of a marine organism attachment / growth control apparatus including a magnetic processing apparatus that can be specifically applied to the above-described embodiment of the present invention, and the invention according to claim 2 has at least one pair in a short pipe. The magnet processing device, in which the pair of magnets are arranged so that the N pole and the S pole face each other and fixed and held by a magnet fixing plate, is used at least as a part of the seawater piping device. I do.
[0012]
Further, the invention according to claim 3 is an apparatus further provided with a countermeasure against foreign matter mixing, wherein at least one pair of bar-shaped magnets is paired between the inner and outer pipes of a short double pipe consisting of an inner pipe and an outer pipe. A magnetic processing apparatus inserted and fixed so that the N pole and the S pole face each other in the upper half and the lower half is used at least in a part of the seawater piping device.
[0013]
Further, the invention according to claim 4 takes into account the suppression of the adhesion and growth of the sea creatures and the suppression of the corrosion of carbon steel such as carbon steel pipe by seawater, and the seawater piping apparatus also includes carbon steel pipe. In such a case, it is preferable to use a magnetic processing apparatus in which the at least one pair of bar-shaped magnets are arranged and fixed such that the paired magnets face the N pole and the S pole to each other, on the seawater inlet side of the carbon steel pipe. is there.
[0014]
[Action]
When carrying out the present invention, when installing a short pipe incorporating a pair of rod-shaped permanent magnets along the flow direction of seawater on the seawater intake side of the existing pipe to take in seawater, seawater passes between the magnetic poles. Adhesion and growth of marine organisms is suppressed, and a large number of marine organisms adhere to the inlet side through which the magnetically treated seawater passes, but no marine organisms adhere to the outlet side, and a clean surface is obtained.
[0015]
Further, when the pipe is a carbon steel pipe, the magnetic treatment not only suppresses the attachment and growth of marine organisms, but also suppresses seawater corrosion.
Although the theoretical basis for the effect of the magnetic treatment on the inhibition of marine organism attachment and growth as described above is not necessarily sufficient, these effects have been found from the results of marine organism growth experiments. ing.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an example of a basic seawater magnetic treatment apparatus embodying the present invention.
[0017]
As shown in the figure, a pair or a plurality of pairs, in the figure, two pairs of rod-shaped permanent magnets 4 and 5 are connected to a short pipe 1 having flanges 2 at both ends connected to an existing pipe via a magnet fixing plate 3 as shown in the figure. The magnets 4 and 5 are arranged along the flow direction of seawater, and the magnets 4 and 5 forming a pair are arranged such that the N pole and the S pole face each other.
The magnets used are each coated with a seawater resistant coating to prevent corrosion.
[0018]
If a short pipe incorporating a magnet is used and attached to the seawater inlet side as described above, the effect of magnetic treatment can be obtained by passing seawater between the magnetic poles. The higher the magnetic flux is, the faster the flow velocity should be within a range in which erosion and corrosion of the piping do not occur.
In addition, the short piping shown in the above-mentioned figure is a unit unit of the seawater magnetic treatment apparatus embodying the present invention, and it is possible to use not only one but a plurality of them and connect them in parallel or in series to further enhance the effect. It is.
[0019]
By the way, a lot of small foreign substances such as shellfish and garbage are contained in actual seawater. Therefore, when seawater is passed for a long time, in the processing apparatus shown in FIG. 1, the magnet fixing plate 3 has a role similar to that of the strainer, and small foreign matters are clogged in this portion, and there is a problem that the water is easily blocked. is there.
[0020]
FIG. 2 shows an example of a magnetic processing apparatus in which such a countermeasure against foreign matter is taken into consideration as an improvement of FIG.
In this apparatus, for example, bar-shaped magnets 14 and 15 are provided between an inner tube 12 and an outer tube 13 of a cylindrical double-tube container 11 made of a polymer synthetic resin, and an N pole and an S pole are formed in an upper half and a lower half. The magnets are arranged so as to face each other, and have a structure in which the magnets are arranged in a cylindrical shape and are inserted and fixed between the inside and the outside. There is no obstacle, and there is no concern that foreign matter in seawater will be clogged in the magnet fixing portion.
[0021]
The outer diameter of the double pipe container 11 is, as shown in the figure, inserted into the short pipe 1 having the flanges 2 at both ends. It has become.
A stopper 16 is provided as appropriate to hold the position of the inner double tube container 11 when assembled as shown in the figure.
In addition, as a countermeasure against foreign matter contamination, not only the method of fixing the magnet inside the pipe as described above, but also a method of fixing the magnet to the outside of the pipe is possible, and the magnet may be fixed by other appropriate means. .
[0022]
In the above description, the seawater magnetic treatment using a permanent magnet was described . However, the use of magnetism for water treatment is effective or not, except for industrial water piping, water receiving tanks, and cooling towers for non-seawater. And other measures to control red rust and water deposits, and to prevent calcium and silica scale deposition on groundwater pumping pipes.
However, in any case, the treatment measures are fresh water such as tap water, industrial water, and groundwater, and there are no application examples for seawater or marine life.
In addition, no papers have been found on the effects of magnets on the attachment and growth of marine organisms, and no studies have been made so far.

[0023]
Furthermore, unlike seawater, in a freshwater environment (tap water, industrial water, groundwater) as in the above-mentioned application example, it is necessary to consider clogging by small foreign substances such as shellfish shreds and garbage that exist in seawater. There is no. Therefore, no case has been considered in which a countermeasure against foreign matter has been considered, and the foreign matter countermeasure is a measure uniquely required in seawater treatment.
[0024]
【Example】
Using a magnetic treatment apparatus having the structure shown in FIG. 1, the effect of suppressing the adhesion of sea organisms to seawater piping was observed at a seawater intake of a power plant along the Japan Sea coast.
FIG. 3 shows the configuration of the seawater piping device. This seawater piping device is constituted by appropriately combining and connecting carbon steel piping 23, 32, vinyl chloride piping 24, 33, and seawater magnetic treatment device 31 using upper, lower, lower panels 35, 36, 37, respectively. Seawater is pumped up by a pump (not shown), absorbed by the upper left pipe 28, and discharged from the lower right pipe.
[0025]
In the figure, reference numeral 21 denotes a union, 22 denotes a pipe fixing jig, 25 denotes an insulating joint, 26 denotes a flexible resin pipe, and 27 denotes an upper air release valve. The magnetic processing device 31 is substantially omitted. The pipes 23 and 32 and the vinyl chloride pipes 24 and 33 are respectively combined and arranged to form a seawater piping apparatus as a whole.
[0026]
According to the above seawater piping device, the piping from the seawater inlet at the upper left of the figure to the seawater magnetic treatment device 31 is exposed to untreated seawater, while the seawater outlet at the lower right from the seawater magnetic treatment device 31 is exposed. The piping up to will be exposed to the seawater after the magnetic treatment. Therefore, the effect of the magnetically treated seawater can be evaluated by comparing the state of adhesion and growth of sea organisms to pipes before and after the seawater magnetic treatment apparatus.
[0027]
Then, using this seawater piping system, observation of the state of attachment and growth of marine organisms was carried out for about half a year from early May to the end of October. This is due to the fact that marine life grows significantly in summer.
FIGS. 4 to 6 show the state of adhesion and growth of marine organisms. The state of adhesion and growth of marine organisms is summarized below for each figure.
[0028]
(A) Status of seawater magnetic treatment equipment (Fig. 4)
Many barnacles, algae, etc. are attached to the inlet side (see Fig. 1) through which untreated seawater passes, and they continue to grow. However, the exit side (Figure B) through which the magnetically treated seawater passes remains a clean surface, and no marine organisms are attached.
[0029]
(B) Carbon steel piping status (Fig. 5)
In the carbon steel pipe through which untreated seawater passes (see Fig. 1), marine organisms such as barnacles and algae attach and grow remarkably, and bad odors that are considered to be caused by marine organisms and corrosion are severe. On the other hand, no marine organisms are found on the carbon steel pipe through which the magnetically treated seawater passes (b).
[0030]
(C) Situation of PVC piping (Fig. 6)
Since the vinyl chloride piping does not corrode, the difference in the state of adhesion of marine organisms before and after the magnetic treatment is even more apparent. In areas where untreated seawater passes, slime adheres heavily in addition to the attachment and growth of marine organisms such as barnacles. (Refer to figure a)
On the other hand, in the area where the magnetically treated seawater passes, only a faint brown water rust can be seen on the surface (see Fig. B), and no trace of attachment and growth of marine organisms is observed.
[0031]
Next, with respect to the carbon steel pipe, the time-dependent change in weight was determined in order to know the state of seawater corrosion of the carbon steel. As a result, as shown in FIG. 7, in the comparison before and after the magnetic treatment, the weight increase of the carbon steel pipe through which the magnetically treated seawater passes is about half that of the carbon steel pipe through which the untreated seawater passes. This difference in weight change was estimated to be greater than the difference in the weight of attached sea organisms, indicating that magnetic treatment had the effect of suppressing seawater corrosion of carbon steel as well as inhibiting the attachment and growth of sea organisms. .
[0032]
In each of the long-term water flow tests shown in the above examples, since the magnetic processing device having the structure shown in FIG. 1 was incorporated and used, there was a problem that small foreign matters such as shellfish and dust were clogged on the seawater inlet side of the magnet fixing portion. And periodic removal was required.
[0033]
Therefore, as a countermeasure, a seawater magnetic treatment device for foreign matter countermeasures shown in FIG. 2 was used in place of the magnetic treatment device having the structure shown in FIG. 1 to conduct a water flow test. Not very effective.
[0034]
【The invention's effect】
The present invention, as described above, the suppression of adhesion and growth of such marine organisms are those applying the magnetic treatment of seawater seawater corrosion inhibition, such as carbon steel, seawater at least a pair of rod-shaped permanent magnet in seawater pipe The magnetic processing effect can be obtained only with a simple configuration incorporating a magnetic processing device arranged along the flow direction of the sea, the seawater passing between the magnets is suppressed from adhering and growing marine organisms, and the seawater adhering to the pipe outlet side is And a remarkable effect of preventing the occurrence of water supply failure due to blockage inside the pipe is achieved.
[0035]
In addition, as described above, the adhesion and growth of sea organisms in the seawater are suppressed, so that there is no need to remove the attached sea organisms inside the pipes, and there is no work such as painting or replacing the existing pipes, thereby reducing costs. It has the advantage of significantly reducing.
Further, since the magnetic treatment of the present invention uses a permanent magnet instead of a chemical substance, there is no concern about the effect on the environment. Further, long-term continuous use is possible by using a countermeasure against foreign substances.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a basic configuration example of a seawater magnetic treatment apparatus according to the present invention.
FIG. 2 is an exploded perspective view showing an example of the above-described processing apparatus for preventing foreign matter as another embodiment of the seawater magnetic processing apparatus according to the present invention.
FIG. 3 is a front view showing a configuration example of a seawater piping device using a seawater treatment device.
FIG. 4 is a diagram showing the state of adhesion of sea creatures to the seawater magnetic treatment apparatus.
FIG. 5 is a view showing the state of adhesion of marine organisms to a carbon steel pipe, wherein (a) is an untreated water inlet side and (b) is a treated water outlet side.
FIG. 6 is a view showing the state of adhesion of marine organisms to a vinyl chloride pipe, where (a) is the untreated water inlet side and (b) is the treated water outlet side.
FIG. 7 is a chart showing a change over time of the weight of a carbon steel pipe.
[Explanation of symbols]
(1) Short pipe (2) Flange (3) Magnet fixing plate (4), (5) Rod magnet (11) Double tube vessel (12) Inner cylinder (13) Outer cylinder (14), (15) Rod magnet (23), (32) Carbon steel piping (31) Magnetic processing unit

Claims (4)

In a seawater piping system that takes in seawater from one side and discharges the seawater from the other end , at least a pair of rod-shaped permanent magnets are arranged in the pipe so that the N pole and the S pole match each other along the flow direction of the seawater. A method for suppressing the adhesion and growth of marine organisms, comprising applying a magnetic treatment to seawater passing through the space. At least a magnetic processing apparatus in which at least a pair of rod-shaped permanent magnets are arranged in a short pipe along the flow direction of seawater such that the paired magnets face each other with N and S poles facing each other and fixed and held by a magnet fixing plate. A marine organism adhesion / growth control device characterized by being used as part of a seawater piping device. At least one pair of bar-shaped permanent magnets is paired between the inner and outer tubes of the short double tube consisting of the inner tube and the outer tube along the flow direction of seawater. A marine organism adhesion / growth control device, wherein a magnetic treatment device inserted and fixed so that poles face each other is used at least in a part of a seawater piping device. The seawater piping apparatus includes a carbon steel pipe, and at least a pair of rod-shaped permanent magnets are arranged and fixed at the seawater inlet side of the carbon steel pipe so that the magnets forming a pair along the flow direction of the seawater face the north pole and the south pole. A marine organism adhesion / growth control device characterized by using a magnetic processing device.

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