JP2001259691A - Method and device for preventing deposition of rust, scale and other component in fluid passage and/or removing the deposit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for making the treatment in a modulated electric field efficient, promoting its effect, investigating the cause to hinder the treatment and finding its solution. SOLUTION: A coil is wound on the surface of a first fluid passage or a second fluid passage for the fluid to be introduced into the first fluid passage to remove a cationic chemical, then a square-wave AC current with the frequency changed with time is applied on the coil, and the fluid flowing in the first fluid passage or second fluid passage is treated by a modulated electric field induced by the current flowing in the coil. Consequently, the deposition of rust, scale and other components on the wall face constituting the first fluid passage is prevented and/or the deposit is removed. This treatment in a modulated electric field is promoted by adding an anionic surfactant, sodium carbonate, sodium bicarbonate or sodium hydroxide to the water to be treated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a rust, scale, and other components from adhering to a wall of a fluid flow path by treating a fluid flowing through the flow path with a modulated electric field.
Or a method and apparatus for removal.

[0002]

2. Description of the Related Art Conventionally, the flow path of various fluids, for example, used industrial water, industrial wastewater, domestic wastewater, etc., for example, the wall surface of pipes is rusted or scale adheres, and in some cases, the fluid flow path Was sometimes clogged. Therefore, the present inventors, by performing a modulated electric field treatment of the fluid flowing through the fluid flow channel, a method for preventing rust on the wall surface constituting the fluid flow channel, a method for attaching and / or removing sea organisms from the wall surface,
A method for preventing the flow path wall from being clogged by oil-containing wastewater flowing through the fluid flow path was developed, and a patent application (Japanese Patent Application No. 11-15192) was filed. Further, the present applicant has disclosed in US Pat. No. 5,074,998 a method for preventing a substance attached to a wall constituting a fluid flow path by applying a modulated electric field treatment to a fluid already flowing through the fluid flow path. We have obtained a patent for a method to remove the deposits attached to.

[0003]

In the invention according to the patent application of the present inventors, the fluid flowing through the fluid flow path is subjected to a modulated electric field treatment, thereby effectively preventing rust on the wall constituting the fluid flow path. Is performed, but depending on the type of the fluid, the desired processing may not be sufficient, or the desired processing may hardly be performed. Further, in the invention according to the patent application of the present inventors, no consideration was given to promoting the effect of the modulated electric field processing.

[0004] Therefore, an object of the present invention is to solve the problems of the prior application of the inventors of the present invention, to improve the efficiency of the modulation electric field processing, to promote the effect thereof, and to prevent the modulation electric field processing from being obstructed. The purpose is to provide a method and apparatus for determining and taking a solution.

[0005]

The above object of the present invention is attained by the following constitution. (1) A coil is wound around the surface of the first fluid flow path or the second fluid flow path for the fluid to be introduced into the first fluid flow path,
Flowing a square wave alternating current whose frequency changes over time into the coil, and processing the fluid flowing through the first fluid flow path or the second fluid flow path by a modulated electric field induced by the current flowing through the coil. In the method for preventing and / or removing rust, scale, and other components from adhering to the wall surface constituting the first fluid flow path, the following treatment is performed.

(A) The above-mentioned modulation electric field treatment is performed after removing a cationic drug or other substances (such as suspended substances) which inhibit the above-mentioned modulation electric field treatment of a fluid. (B) performing the modulated electric field treatment after adding an anionic drug that promotes the modulated electric field treatment of the fluid; (C) performing the modulated electric field treatment after adding sodium carbonate, sodium bicarbonate or sodium hydroxide which promotes the modulated electric field treatment of the fluid; (D) The output such as the current value for the modulated electric field process is increased together with or separately from the processes (b) and (c).

Next, for example, a mechanism for attaching scale to the inner wall of the pipe for treated water and a mechanism for preventing the scale from adhering to the inner wall of the pipe for treated water by the modulated electric field treatment method of the present invention. explain.

First, the mechanism by which the scale adheres to the inner wall of the pipe for treated water will be described. As shown in FIG. 26, the surfaces of the inner wall of the pipe, the inner wall of the storage tank, and the like that are in contact with the water to be treated are negatively charged. The surface of the scale crystal formed by precipitation of the scale component under the saturated condition in the water to be treated is usually positively charged. The scale component adheres to the surface such as the inner wall due to the electric attraction between the potentials of opposite signs (plus and minus).

The scale component is contained in the water to be treated.
Inorganic compounds are the main components, CaCO ₃(Calcium carbonate
), CaSO₄(Calcium sulfate). However,
Almost no scale crystals as simple inorganic compounds
For example, in the case of silica scale, SiO₂(Silica) mainly
The body contains metals such as Ca, Mg, Al, etc.
Are bonded or ionically bonded. In addition, CaCO₃Single bond
As scale crystals, most of which are 10-1
It is an aggregate of 00 or more crystals. The crystal
The force that forms the aggregate is the above-mentioned electrical attraction or hydration
Caused by

Further, Ca ²⁺ , F dissolved in the water to be treated.
As the amount of cations such as e ³⁺ is larger, the positive power of the surface of the scale crystal formed at the same time is increased, and the concentration of the aggregate of the crystal is also increased to increase the scale growth property.

FIG. 1 shows a mechanism for preventing the scale from adhering to the inner wall or the like of the pipe for treated water by the modulated electric field treatment method. As described above, the surfaces of the pipe inner wall, the storage tank inner wall, and the like in contact with the water to be treated are negatively charged,
The surface of the scale crystal formed in the water subjected to the modulated electric field treatment is neutrally or negatively charged as shown in FIG. A repulsive force is generated by the electric repulsion between the same sign potentials, thereby preventing the scale from adhering to the inner wall surface or the like. Further, at this time, the scale crystals are also dispersed by the repulsive force, the scale growth is suppressed, and a large number of small-sized crystals are easily formed.

Further, as the permeability of the water subjected to the modulated electric field treatment increases, the scale crystal becomes smaller due to dissolution and recrystallization of the crystal inside the scale crystal and a repulsive force due to negative charge on the surface of the scale crystal. It is formed into particles, and thus easily dispersed. In this way, small-sized crystals are easily removed by flowing down in the high flow velocity portion of the water to be treated, and settle and accumulate in the low flow velocity portion.

Further, the harder the scale surface of the hard scale, for example, the scale crystal mainly composed of silica, the more the surface of the modulated electric field treated water is impaired, and the longer it takes to soften and remove it. The pH of the water to be treated
The lower the temperature and the lower the temperature, the longer it takes to remove or soften the scale. However, even in the case of a hard scale having a normal uneven surface, many can be easily softened or removed by the modulated electric field treatment of the present invention.

Soft scale, for example Fe (OH) ₃ , C
a (OH) _{2 and the} like are hydrates (Fe (OH) ₃ .nH ₂ O)
As a result, the displacement of the modulated electric field treated water of the present invention with the water molecules in the hydrate is easily inhibited, and the scale removing effect is small. Also, when the soft scale forms a deposit with another slime inhibitor or a polymer agent used as an anticorrosive, the modulated electric field treatment of the present invention is likely to be inhibited.

[0015] The modulated electric field treatment of the present invention is preferably 10H
z to 10 MHz, more preferably 100 Hz to 1 MH
z, more preferably, a coil for flowing a square wave alternating current whose frequency changes with time in a band of 700 Hz to 3000 Hz is wound around the fluid flow path.

The mechanism by which black rust is generated on the wall surface of the iron device by the modulated electric field treatment of the present invention will be described below. An induced electric field E causing an eddy current generated by the modulated electric field processing of the present invention is formed as shown in FIG. 2A, and the induced electric field E becomes a maximum value as shown in FIG. It becomes a reduced state as an electron donating band.

The dissolved oxygen in the water acts as OH ions according to the following formula, and black rust is formed as shown in the following reaction formula. When black rust is formed, the corrosion of the wall surface does not proceed thereafter, so black rust has an anticorrosive action. _{O 2 + 2H 2 O + 4e} - → 4OH - Fe 2 O 3 ( rust) → _Fe 3 _{O 4} (black rust) Note that portions of charge by the modulation electric field treatment of the present invention is water in water - scale crystals, water - gas (air Etc.), water-piping inner walls, water-oil interface, etc. The present invention also includes an apparatus for carrying out the invention of each of the above methods.

Prevention of scale in various devices by the modulated electric field treatment of the present invention, removal of scale and prevention of corrosion of various devices, prevention of clogging of oil-containing drainage channels, prevention of adhesion of marine organisms to wall surfaces of various fluid channels. Various methods for making the effects such as the above effectively work and a method for confirming the effects will be described below.

In order to make the modulated electric field processing method of the present invention effective, it is necessary to confirm the effect of the modulated electric field processing by a desk test method and then to perform the modulated electric field processing of the present invention on an actual machine. Is preferable, and an example thereof will be described.

(1) Untreated Water Untreated water is passed through a desk test apparatus shown in FIG. 3 to prepare a liquid to be treated for the desk test apparatus. Desk test for pipe 1
In the state in which an alternating current (an output changes from 0.14 A to 25 A, a frequency of 10 Hz to 10 MHz) having a different current value with respect to the elapsed time is passed through the coil 2, electromagnetic waves are generated by the converter 3, This is performed by passing the water to be treated in the bottle 4 through the pipe 1. The to-be-processed water treated by the desk test apparatus is received by a beaker 5, a part of which is dropped on a glass plate 6 (FIG. 4), dried at room temperature, and the change of crystal at the interface of the dried sample is observed with a microscope. After confirmation, the degree of the modulated electric field processing effect is determined. In the case of a high temperature under the actual machine conditions, heating and the like are performed in the above-mentioned desk test so that the same conditions as those of the actual machine are performed, and the same determination is performed.

(2) Treated water in actual machine Treated water is dropped directly on a glass plate and dried at room temperature.
The determination of the effect of the modulated electric field treatment on the basis of a change in the crystal or the like at the interface of the dried sample is the same as in the case of untreated water. After selecting the equipment by similar processing under the actual processing conditions, adjust the processing liquid on the desk again, check the insufficient output of the modulated electric field processing, etc. It is necessary to check the presence or absence of impurities and to take appropriate measures to restart the processing on the actual machine. In addition, the output of the modulated electric field processing is set appropriately in consideration of the results of the desk test and the conditions of the actual machine.

The present inventors consider that when the modulated electric field treatment of the present invention is performed under the condition that the drug is mixed in the water to be treated, the modulated electric field treatment effect may not be exerted or may have an adverse effect. As a result of intensive studies to find out the cause, it has been found that when a specific chemical is contained in the water to be treated, the modulated electric field treatment of the water to be treated is inhibited. It has also been discovered that the addition of other specific agents enhances the modulated electric field treatment of the water to be treated.

There are the following types of chemicals that inhibit the modulation electric field treatment of the water to be treated. 1. Surfactant (cationic) 2. 2. Polymer agent (cationic) 3. Cleaning can (boiler) 4. Scale inhibitor 5. Anticorrosive (including phosphate and cationic polymers) 6. Slime inhibitor 7. antistatic agent 8. Rinsing agent (dry finish) Floor wax agent 10. In addition, antifoaming agents (silicone-based), marine organism adhesion inhibitor, etc.

If it is possible to determine the properties common to the above-mentioned chemicals that inhibit the modulation electric field treatment of the water to be treated, the modulation electric field treatment is carried out after removing the chemicals having the properties from the water to be treated, so that the modulation is effectively performed. Electric field treatment can be performed.

For example, it is well known that the quaternary ammonium salt as the slime inhibitor is positively charged (Suzuki Shizuo, "Troubles and Treatment of Cooling Water", Corona Co., Ltd., Showa 43) Thus, the drug is considered to be a “cationic” drug that positively charges the solid surface potential.

When the cationic drug functions as an anticorrosive, it is considered to be based on the following mechanism. That is, the cationic drug positively charges the inner wall of the fluid pipe, which is negatively charged, increases the positive charge power on the surface of the scale crystal, and increases the repulsive force of the plus (inner wall of the fluid pipe) to the plus (scale crystal) to the fluid pipe. Prevents the scale from adhering to the inner wall. Also,
The resilience between the scale crystals also suppresses the growth of the scale crystals. In other words, the anticorrosive action of the anticorrosive is based on the opposite charging action to anticorrosion by charging the scale crystal negatively by the modulated electric field treatment action of the present invention and repelling the inner wall of the negatively charged fluid pipe. Things.

It is presumed that the agent that inhibits the modulated electric field treatment of the water to be treated is an agent that positively charges the scale crystal by the mechanism as described above. -10. Is defined as a cationic drug.

Therefore, in order to adhere and / or remove scale on the inner wall surface of the fluid pipe by the modulated electric field treatment operation of the present invention, the above-mentioned cationic drug is removed in advance or the injection of these drugs is stopped. Is effective. However, it is an indispensable chemical in the manufacturing process, and if it is not the above 3 to 10 chemicals, a model with a high output of the modulated electric field processing device is selected, and the effect is confirmed by the above-described desk test with a microscope, and the interface is checked. If it is determined that the change is favorable, in that case, it is considered that the effect of the agent that inhibits the modulated electric field processing action of the present invention has disappeared, and the processing is performed with the output of the modulated electric field processing apparatus that matches the condition at that time. be able to.

The main agents that inhibit the modulated electric field treatment of the water to be treated are described below. 1. Surfactants Surfactants are classified into cationic (plus), anionic (minus), and nonionic surfactants, but they are commercial products with good foam removal and inaccessibility. Most are anionic surfactants and do not have an inhibitory effect on the modulated electric field treatment device. Plates, cups, hands, etc. are negatively charged, so using an anionic detergent makes it easy to wash with water. Older generation detergents are cationic and are now rarely used for home use, but are still used for industrial purposes.

2. Scale dispersant Chelating agent, sodium hexametaphosphate, etc.
It is an agent that increases the positive charge power on the scale crystal surface and prevents scale adhesion by positive-plus repulsion. In addition, the resilience between the scale crystals suppresses the growth of the scale crystals.

3. Slime inhibitor The antibacterial activity typified by chlorine agents and the bactericidal activity of quaternary ammonium salts are easy to adsorb to negatively charged bacteria, algae, etc., because the slime inhibitor has a positive charge. It is because. If the slime inhibitor is excessively injected, the strong oxidizing action may remain in the water to be treated and cause corrosion damage.

4. Anticorrosives These are composed of polymerized phosphates, polymers, etc., and form a phosphoric acid or polymer film to obtain an anticorrosive effect. However, if injected excessively, not only will calcium phosphate be formed like hexametaphosphate in the scale inhibitor, but phosphate ions generated by hydrolysis will become an essential nutrient source for bacteria, causing damage by slime formation Sometimes. When the slime inhibitor is used, corrosion of steel is promoted by its strong oxidizing power, so that an anticorrosive is often used in combination. In this case, the film adheres to the inner wall of the pipe that is negatively charged in the form of a film, and is positively charged. That is, corrosion of the inner wall of the pipe is prevented by repelling the positively charged slime inhibitor from the inner wall of the pipe.

As described above, the anti-scaling agent, anti-slime agent or anti-corrosion agent, due to its positive charging action,
This is to achieve the purpose, and may be used as a triple complex.

When the modulated electric field treatment of the present invention is applied to a facility using a cationic polymer agent,
Even if the use of the polymer agent is stopped, the adverse effect may occur due to the effect of the remaining cationic polymer agent, and the soft substance may adhere to the inner wall surface of the pipe, causing a failure. Therefore, when the modulated electric field treatment of the present invention is applied to the water to be treated containing the cationic polymer agent, all the water to be treated in the device is replaced, the amount of replenishing water is increased, and the remaining cationic polymer agent is increased. Must be removed.

5. Influence of suspended solids (SS) Suspended solids (SS) are insoluble substances in water.
Also includes e-Al-based aggregated blocks and scale crystals. Most of suspended matter (SS) such as mud is negatively charged, but most of Fe / Al-based aggregated flocs or scale crystals are positively charged.

In the water subjected to the modulated electric field treatment of the present invention, the negative band power is reduced by the floating substance (SS) which is strongly positively charged. As a result, the water to be treated and the untreated water which have been subjected to the modulated electric field treatment are reduced. The negative power of mixed water composed of water may be lost.

Further, the amount of the floating substance to be positively charged is 3
If it is 000 ppm or more, the modulated electric field treatment effect of the present invention is inhibited. This is considered to be due to the fact that the charged power is consumed by the floating substance and the uncharged scale crystals remain.

[0038] Even when the suspended substance has the property of being negatively charged, the cationic substance may adhere to the suspended substance when the water to be treated contains a large amount of the cationic drug, and may become cationic as a whole. is there. Therefore, it may be necessary to perform a desk test and remove the suspended substance from the water to be treated before applying the modulated electric field treatment of the present invention, even if the suspended substance is originally negatively charged.

In order to apply the modulated electric field treatment of the present invention to the water to be treated, the raw water not containing the chemical is subjected to the modulated electric field treatment, and then the treated raw water is mixed with the treated water containing the suspended substance. In addition, the effect of charging the suspended matter in the water to be mixed is increased.

The method for promoting the effect of the modulated electric field treatment of the present invention is as follows. 1. Combination treatment method with an anionic drug; The present inventors have discovered that there is a method of injecting treated sodium carbonate or sodium bicarbonate.

1. Combination treatment method with anionic drug For treated water that forms scale crystals that are excessively positively charged, if the modulated electric field treatment of the present invention alone has no effect, the anionic drug is used at a low concentration. By injecting into the water to be treated, a good treatment effect can be obtained. In this case, the modulation electric field processing device can also cope with a low output.

2. Injection method of sodium carbonate or sodium hydrogencarbonate In equipment with severe calcium scale disorder, by using sodium carbonate or sodium hydrogencarbonate injection together, promote the effect of modulated electric field treatment as well as the combined treatment of the above anionic drugs Can be.

When the effect of the modulated electric field treatment of the present invention cannot be obtained due to the presence of silica, it is also effective to inject a sodium compound (such as NaOH) in addition to the above-mentioned agents.

By adding the above-mentioned anionic chemical or sodium carbonate or sodium hydrogen carbonate to the water to be treated containing the suspended substance, the suspended substance is removed from the treated water before applying the modulated electric field treatment of the present invention. You may not need to.

As described above, in the modulated electric field treatment, the prevention of the adhesion of scale to the inner wall of the pipe, the removal of the attached scale, the prevention of corrosion of the inner wall of the pipe, the prevention of clogging of oil-containing drainage pipe, etc.
For the effect of preventing seafood from adhering to the inner wall of pipes, etc., it became possible to select an effective treatment method by using an effect confirmation method using a microscope.

[0046]

According to the present invention, the wall surface constituting the fluid flow path is purified using a low-cost apparatus and in a manner that is excellent in operability, thereby preventing rust, scale, marine organisms and the like from adhering, and / or Removal and prevention of clogging due to deposits on pipes are possible.

[0047]

Embodiments of the present invention will be described with reference to the drawings. First, a description will be given of a desk test method for confirming whether or not the modulated electric field processing (modulated electric field processing) according to the embodiment of the present invention actually has an effect, and confirming the effect of the modulated electric field processing. An example of the modulated electric field processing will be described.

The untreated water is passed through a desk test apparatus shown in FIG. 3 to adjust the liquid to be treated for the desk test apparatus. In contrast, AC currents with different current values (output 0.1
Changes between 4A and 25A, frequency 10Hz-10MH
While the electromagnetic wave is generated by the converter 3 by flowing z), the water to be treated in the bottle 4 is passed through the pipe 1. Beaker 5
4 is dropped on a glass plate 6 (FIG. 4) and dried at room temperature, and FIG. 4 (FIG. 4A is a plan view, FIG.
(B) is a side view), the change of the dry crystal at the interface of the sample is confirmed with a microscope, and the degree of the modulated electric field treatment effect is determined.

The location where repulsion from the vicinity of the interface of the negatively charged scale crystal is most confirmed is A (FIG. 4).
(B)). However, when the specific gravity of the scale crystal is large, the repulsive force is less likely to appear.

When the temperature is high under the actual machine conditions, heating and the like are performed in the above-mentioned desk test so that the same conditions as those of the actual machine are used, and the same judgment is made.

Here, the method of determining the degree of the modulation electric field processing effect is performed as follows. As a result of the microscopic inspection, when the following changes are shown as compared with the untreated water, the effect is determined to be “good”.

First, there is the formation of small grain crystals, which indicates that the large scale crystals have been made smaller and more dispersible by the modulated electric field treatment. Secondly, there is an interface change, the particle aggregation property is reduced, the dispersibility is exhibited, or the particles have resilience, and the particles close to the interface show a state separated from the interface by the modulation electric field treatment. It is. Thirdly, the crystal growth property is lost, and the crystal that has grown in a branch shape based on the interface becomes small particles,
Or, a state in which the branch crystals have disappeared.

On the other hand, it is determined that there is no effect of the modulated electric field treatment when there is a change as follows as compared with untreated water.

This is the case where there is no generation of small particle crystals and there is no change at the interface. In this case, when the number of times of passage through the pipe 1 is increased, there is no particle resilience near the interface, but rather particles are aggregated, and crystals tend to grow.

Next, the results of the modulated electric field treatment in the case of including the agent which inhibits the modulated electric field treatment of the present invention and in the case of removing the agent will be described.

(1) Surfactant Table 1 shows the results of the desk test shown in FIG. 3 for the modulated electric field treatment of the present invention for various shampoos and rinses.

[0057]

[Table 1]

As shown in Table 1, there are surfactants having a treatment effect in the modulated electric field treatment of the present invention and surfactants having no treatment effect. From the above, there is a treatment effect in the modulated electric field treatment of the present invention. The surfactant (（) is an anionic surfactant having a negative surface potential, and the surfactant (×) having no treatment effect in the modulated electric field treatment of the present invention is a surfactant having a cationic surface potential. The surfactant (△), which has little treatment effect in the modulated electric field treatment of the present invention, is a surfactant whose polarity is unknown.

The results of the desk test of the surfactant (○) having a treatment effect in the modulated electric field treatment of the present invention, the surfactant (x) having no treatment effect, and the surfactant (△) having little treatment effect are shown. , Respectively, are shown in the micrographs of FIGS. 5, 6 and 7.

FIG. 5 (× (100) 15 μm / scale) shows treated water containing 200 ppm of “Shampoo E”.
(× (100) 15μm / scale) is “Body Soap C”
Water to be treated containing 100 ppm, FIG. 7 (× (100) 15
μm / scale) is the result of the water to be treated containing 200 ppm of “Shampoo F”.

The photograph shown in FIG. 5 shows that small particle crystals are scattered in the vicinity of the interface, indicating that the effect of the modulated electric field treatment of the present invention is excellent. On the other hand, the photograph shown in FIG. 6 shows that a large lump adheres to the interface, and the modulated electric field treatment effect of the present invention is not present.

(2) Polymer agent FIG. 8 (a) (× (100)) is a photomicrograph after circulating water of a cooling facility not subjected to a modulation electric field treatment was dried on glass.
(15 μm / scale), it can be seen that a large crystal is close to the interface, and that the scale is generated.

The circulating water was subjected to the desk test of the present invention three times,
8 (b) (× (1
(00) 15 μm / scale) shows micrographs after the desktop test was performed 5 times. Aggregation of scale crystal grains is observed at the interface.

As shown in FIGS. 8A and 8B, 1
When the number of treatments was increased from 3 to 5 times, the state in which the dispersibility of the particles was caused by the number of treatments was 3 to 5 times. ,
This chemical was later found to contain a cationic polymer for corrosion protection.

As described above, when the high-molecular-weight drug is injected, the aggregation property of the particles near the interface is increased, and it can be seen that the modulated electric field treatment of the present invention has no effect on the water to be treated. .

(3) Canned agent In order to see the effect of the modulated electric field treatment of the water to be treated containing a specific commercially available canned agent, the treated can was subjected to the modulated electric field treatment in a desk test. The agent was added in increasing concentrations. The results are shown in the micrograph of FIG. FIG.
(A) (× (100) 15 μm / scale) is the above-mentioned cleaning can 1
Water to be treated containing 0 ppm, FIG. 9 (b) (× (100) 1
(5 μm / scale) is a photograph of the water to be treated containing 200 ppm of the cleaning agent. As the injection amount of the drug increases, the collectivity of the particles near the interface increases, and the modulated electric field treatment of the present invention cannot be applied. It became clear.

(4) Scale Dispersant A micrograph of the interface obtained according to the above procedure obtained by adding various concentrations of a specific scale dispersant commercially available to the tap water treated with the modulated electric field in various ways is shown in FIG. 10 (a). FIG. 10 (b)
Shown in FIG. 10A (× (100) 15 μm / scale)
Is the treated water containing 50 ppm of the scale inhibitor, FIG.
(B) (× (100) 15 μm / scale) is a photograph of the water to be treated containing 200 ppm of the scale inhibitor. As the amount of injected chemical increases, the collectivity of particles near the interface is increased. It was presumed to be a cationic drug by the determination method. Therefore, it can be seen that the modulated electric field treatment of the present invention does not have any effect on the water to be treated containing the cationic slime inhibitor.

(5) Corrosion Inhibitor FIG. 11 is a photomicrograph showing the state of the interface of treated water containing 100 ppm of a specific commercially available polymerized phosphate-based anticorrosive without subjecting to the modulated electric field treatment of the present invention. 100) 15 μm /
FIG. 12 (× (100)) is a micrograph showing the state of the interface of the water to be treated which has been subjected to the modulated electric field treatment of the present invention.
(15 μm / scale), but also in this case, it can be seen that the modulated electric field treatment of the present invention on the water to be treated containing the cationic anticorrosive has no effect.

(6) Slime Preventive Agent A microphotograph of the interface obtained according to the above procedure was added to the tap water treated with the modulated electric field while changing the concentration of the specific commercial slime preventive agent in various ways, and FIG. It is shown in b). FIG. 13 (a) (× (100) 15 μm / scale) is the treated water containing 10 ppm of the slime inhibitor, and FIG. 13 (b) (×
(100) 15 μm / scale) is 200 slime inhibitor
This is a photograph of the water to be treated including pm, and as the amount of injected drug increases, the collectability of particles near the interface increases, and it was estimated that the product was a cationic drug by the determination method of the desk test. Also in this case, it can be seen that the modulated electric field treatment of the present invention does not have any effect on the water to be treated containing the cationic slime inhibitor.

(7) Antistatic Agent A microphotograph of the interface obtained according to the above procedure was added to the water to be treated subjected to the modulated electric field treatment while varying the concentration of the specific commercially available antistatic agent. (B). FIG.
4 (a) (× (100) 15 μm / scale) is treated water containing 10 ppm of an antistatic agent and a surfactant, FIG.
(B) (× (100) 15 μm / scale) is a photograph of the water to be treated containing 200 ppm of an antistatic agent and a surfactant. As the amount of injected medicine increases, the aggregation of particles near the interface increases. Therefore, it was presumed to be a cationic drug by the determination method of the desk test. Also in this case, it can be seen that the modulated electric field treatment of the present invention does not have any effect on the water to be treated containing the cationic slime inhibitor.

(8) Rinse Agent A micrograph of the interface obtained according to the above procedure was added to the water to be treated subjected to the modulated electric field treatment while varying the concentration of a specific commercially available rinse agent, and FIG. This is shown in FIG. 15 (a) (× (100) 15 μm / scale) is the water to be treated containing 50 ppm of the rinsing agent, and FIG. 15 (b) (×
(100) 15 μm / scale) is a rinse inhibitor 200 pp
This is a photograph of the water to be treated containing m, which shows that the amount of drug injected increased and the aggregation of particles near the interface increased, and it was presumed to be a cationic drug by the determination method of the desk test. Also in this case, it can be seen that the modulated electric field treatment of the present invention on the water to be treated containing the rinsing agent has no effect.

(9) Sea Life Antifouling Agent The concentration of the specific commercially available sea life antifouling agent was varied and added to the treated water subjected to the modulated electric field treatment, and a desk test was conducted in accordance with the above procedure. 16 (a) and FIG.
(B). FIG. 16 (a) (× (100) 15 μm /
Scale) is water to be treated containing 50 ppm of a marine organism adhesion inhibitor,
FIG. 16B (× (100) 15 μm / scale) is a photograph of the water to be treated containing 200 ppm of the marine organism adhesion inhibitor,
As the drug injection amount increased, the collectability of particles near the interface increased, and it was presumed to be a cationic drug by the determination method of the desk test. Also in this case, it can be seen that there is no effect even if the modulated electric field treatment of the present invention is performed on the water to be treated containing the marine organism adhesion inhibitor.

(10) An example in which the modulated electric field treatment method of the present invention is applied to water to be treated containing an anticorrosive (polymerized phosphate) Scale adheres during long-term use of the bearing cooling water sampling rack of power plant equipment Therefore, the modulation electric field processing of the present invention was applied as a countermeasure.

FIG. 17 shows a circulating system of the bearing cooling water of the power plant equipment. An anticorrosive (polymerized phosphate) is injected into the cooling water tank 10 from the chemical injection equipment 11 as needed, and industrial water is also supplied. From the cooling water tank 10, the heat exchange device 1
Although the cooling water is circulated and supplied to the second bearing, the cooling water in the bearing portion of the heat exchange device 12 returns to the cooling water tank 10 via the sampling racks 13 installed in parallel.

The modulated electric field processing device 14 of the present invention is provided in each circulating cooling water pipe 15 of the introduction part to the sampling rack 13. Then, the modulated electric field treated water was allowed to flow into the cooling water tank 10, and at this time, an anticorrosive (polymerized phosphate) was added from the chemical injection facility 11.

FIG. 18A shows the sampling rack 13.
Shows the situation where scale adhered to the outside of the cooler. FIG.
FIG. 8B shows the state of the scale outside the cooler of the sampling rack 13 after performing the modulated electric field treatment 14 of the present invention continuously for four months.

Since the modulated electric field treatment was performed with the water to be treated containing the cationic anticorrosive (polymerized phosphate), the scale was softened, but remained attached to the cooler.
The scale removal effect is not sufficient.

FIG. 19 (a) is a photograph showing a state in which a large amount of scale is attached to the case housing the cooler of the sampling rack 13 before performing the modulated electric field treatment of the present invention. FIG. 19B shows the inner wall surface of the casing after the water to be treated containing the anticorrosive (polymerized phosphate) has been continuously treated by the modulated electric field treatment device 14 for four months. It was confirmed that the surface of the red rust was softened and a large amount of black rust was formed.

(11) An example in which the modulated electric field treatment method of the present invention is applied to the water to be treated containing the suspended solid (SS) The circulation flow path of the secondary cooling water of the open-type cooling facility of the diesel generator shown in FIG. The modulated electric field processing of the present invention was applied to the present invention.
In FIG. 20, the secondary cooling water discharged from the heat exchanger 17 is cooled in the open type cooling tower 18 and returned to the heat exchanger again via the pump 19 and the strainer 20. Prior to applying the modulated electric field treatment device 14 of the present invention to the circulation path of the secondary cooling water of the actual machine, it is used to prevent scale from adhering to the wall surface of the circulation path of the secondary cooling water. A desk test was conducted to confirm whether the modulated electric field treatment of the present invention was effective when a slime inhibitor and a scale dispersant were added to the secondary cooling water.

The concentration of the specific commercial slime inhibitor and scale inhibitor was added to the tap water treated with the modulated electric field by 10, 50, 10
FIGS. 21 (a) and 21 (a) show typical examples of micrographs of the interface obtained according to the above-mentioned procedure while changing the amounts to 0 and 200 ppm.
(B) shows each. FIG. 21 (a) (× (100) 1
(5 μm / scale) is treated water containing 100 ppm of a slime inhibitor, FIG. 21 (b) (× (100) 15 μm / scale)
Shows a photograph of water to be treated containing 100 ppm of a scale inhibitor. It can be seen that as the chemical injection amount increases, the collectivity and crystal growth of particles near the interface increase.

Then, a milky white polymer-like substance remaining at the bottom of the open type cooling tower 18 shown in FIG.
The results of the microscopic inspection are shown in FIG. Scale components are aggregated on the interface shown in FIG. 22, and it is understood that this is a suspended substance containing a scale dispersant.

FIG. 23 is a photograph showing the situation where the scale adhered to the heat exchanger 17 before removing the suspended substance containing the scale dispersant (particularly, a large amount of the scale adhered to the upper half of the pipe). is there. However, after installing the strainer 20 to remove suspended substances, the modulated electric field processing apparatus 1 of the present invention is used.
When No. 4 was applied, as shown in FIG. 24, the heat exchanger 17 was clean and had no scale deposits.

Next, an embodiment for promoting the modulation electric field processing will be described. In the case where the modulated electric field treatment device of the present invention is applied to a geothermal power generation facility, a desktop test was performed to determine whether the combined use with the auxiliary agent (sodium bicarbonate) could provide more effects than the treatment with the modulated electric field treatment device alone. Was. The micrograph of the interface obtained according to the above procedure is shown in FIG.
(100) 15 μm / scale) and FIG. 25B (× (10
0) 15 μm / scale) shows the results when 10 ppm and 100 ppm of sodium hydrogen carbonate were added, respectively.

In the case shown in FIG. 25B as compared with the state of the interface shown in FIG. 25A, it can be seen that the number of small particles is smaller than the interface and the particles are repelled from the interface. Thus, it was found that the combined use of the auxiliary agent (sodium bicarbonate) and an increase in the amount thereof can provide more effects than the treatment using the modulated electric field treatment apparatus alone.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a mechanism for preventing a scale from adhering to an inner wall or the like of a pipe for treated water by a modulated electric field treatment method of the present invention.

FIG. 2A is a diagram showing an induced electric field that causes an eddy current generated by the modulated electric field processing of the present invention, and FIG. 2B is a diagram showing the induced electric field having a maximum value, which is an electron. It is a figure explaining that it becomes a reduction state as a donor zone.

FIG. 3 is a diagram showing a modulated electric field processing apparatus for a desk test according to the present invention.

FIG. 4 is a diagram showing a dried crystal at an interface of a dried sample for determining the degree of a modulation electric field treatment effect by the desk test modulation electric field treatment device of the present invention (FIG. 4 (a)). Is a plan view, and FIG. 4B is a side view).

FIG. 5 is a microscopic photograph of water to be treated containing a surfactant effective in the modulated electric field treatment according to the embodiment of the present invention.

FIG. 6 is a microscopic photograph of water to be treated containing a surfactant that is ineffective in the modulated electric field treatment according to the embodiment of the present invention.

FIG. 7 is a microscopic inspection photograph of water to be treated containing a surfactant, which is not so effective in the modulated electric field treatment according to the embodiment of the present invention.

FIG. 8 is a microscopic inspection photograph (FIG. 8A) of the water to be treated having a scale failure which is not so effective in the modulated electric field treatment according to the embodiment of the present invention, and FIG. The micrograph after carrying out the desk test of the treated water 5 times is shown.

FIG. 9 is a micrograph of a case where a cleaning agent is added to the water to be treated after the modulation electric field treatment according to the embodiment of the present invention (FIG. 9A)
Is treated water containing 10 ppm of cleaning agent, and FIG. 9B is water to be treated containing 200 ppm of cleaning agent.

FIG. 10 is a micrograph of a water to be treated which has been subjected to a modulated electric field treatment according to an embodiment of the present invention, in which a scale inhibitor is added (FIG. 10 (a) is water to be treated containing 10 ppm of a scale inhibitor, FIG. 10 (b) ) Is treated water containing 200 ppm of a scale inhibitor).

FIG. 11 is a photomicrograph when a polymerized phosphate-based anticorrosive is added to water to be treated which has been subjected to a modulated electric field treatment according to an embodiment of the present invention.

FIG. 12 is a photomicrograph showing a state of an interface of water to be treated containing a polymerized phosphate-based anticorrosive which has been subjected to a modulated electric field treatment of the present invention.

FIG. 13 is a photomicrograph showing the case where a slime inhibitor is added to the water to be treated which has been subjected to the modulated electric field treatment according to the embodiment of the present invention (FIG. 13 (a) is the water to be treated containing 15 ppm of the slime inhibitor; FIG. 13 (b) ) Is treated water containing 200 ppm of a slime inhibitor.

FIG. 14 is a micrograph of an antistatic agent and a surfactant added to water to be treated which has been subjected to a modulated electric field treatment according to the embodiment of the present invention (FIG. 14 (a) shows an antistatic agent and a surfactant 10p).
14 (b) is treated water containing 200 ppm of an antistatic agent and a surfactant).

FIG. 15 is a micrograph of a case where a rinsing agent is added to the water to be treated that has been subjected to the modulated electric field treatment according to the embodiment of the present invention (FIG. 15).
(A) Treated water containing 50 ppm of a rinsing agent, FIG.
(B) is treated water containing 200 ppm of a rinsing agent).

FIG. 16 is a micrograph of a water to be treated which has been subjected to a modulated electric field treatment according to an embodiment of the present invention, in which a marine organism adhesion inhibitor is added (FIG. 16 (a) is a water to be treated containing 50 ppm of a marine organism adhesion inhibitor; FIG. 16 (b) shows a 200 ppm anti-sea organism adhesion agent.
To-be-treated water).

FIG. 17 is a diagram showing a circulation system of bearing cooling water of power plant equipment.

FIG. 18 (a) shows a situation where it is attached as a scale outside the cooler of the sampling rack of the bearing cooling water circulation system of the power plant equipment of FIG. 17, and FIG. 18 (b)
Shows an example in which the modulation electric field treatment of the present invention was continuously performed for four months while the anticorrosive (polymerized phosphate) was being injected, and conversely, a scale hindrance occurred.

FIG. 19 (a) is a photograph showing a state in which a scale is attached to a case accommodating a cooler of the sampling rack before performing the modulated electric field treatment of the present invention, and FIG. b) shows the inner wall surface of the casing after the modulated electric field treatment of the present invention is continuously performed on the water to be treated containing the anticorrosive (polymerized phosphate) for four months.

FIG. 20 shows a flow diagram in which the modulated electric field treatment device of the present invention is applied to a circulation channel of secondary cooling water of an open-type cooling facility of a diesel generator.

FIG. 21 shows a micrograph (FIG. 21 (a)) of an interface obtained by adding a specific commercially available slime inhibitor to tap water subjected to a modulated electric field treatment according to the embodiment of the present invention and following the above procedure, and an embodiment of the present invention. 21B is a photomicrograph (FIG. 21 (b)) of an interface obtained by adding a specific commercial scale inhibitor to tap water treated with a modulated electric field according to the above procedure.

FIG. 22 is a micrograph of a milky white polymeric substance remaining at the bottom of the open cooling tower shown in FIG. 20;

FIG. 23 is a photograph showing a scale adhesion state in a heat exchanger before removing a suspended substance containing a scale dispersant.

FIG. 24 is a photograph showing a heat exchanger subjected to a modulated electric field treatment according to the present invention after a suspended substance is removed by installing a strainer.

FIG. 25 is a micrograph of an interface showing the results of a desk test showing the effect of an auxiliary agent (sodium bicarbonate) that promotes the modulated electric field treatment of the present invention (FIGS. 25 (a) and 25).
(B) 10 ppm and 1 ppm of sodium hydrogen carbonate
The result when 00 ppm is added is shown).

FIG. 26 is a view for explaining a mechanism by which scale adheres to an inner wall or the like of a pipe for treated water.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pipe 2 Coil 3 Converter 4 Bottle 5 Beaker 6 Glass plate 10 Cooling water tank 11 Chemical injection equipment 12 Heat exchange device 13 Sampling rack 14 Modulation electric field processing device 15 Circulating cooling water pipe 17 Heat exchanger 18 Open type cooling tower 19 Pump 20 strainer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 5/00 620 C02F 5/00 620D 1/48 1/48 B (71) Applicant 500045165 Erasmusgracht 29/111 1056 BC Amsterdam The Netherlands (72) Inventor Shinpei Fukamachi 2-5-12 Kikugawa, Sumida-ku, Tokyo SKAA Corporation (72) Inventor Yuichi Otani 2-5-1 Kikugawa, Sumida-ku, Tokyo SKA A shares F term in the company (reference) 4D061 DA01 DA08 DB05 EB09 ED12

Claims (9)

[Claims] A coil is wound around a surface of a first fluid flow path or a second fluid flow path for a fluid to be introduced into the first fluid flow path, and the coil has a rectangular shape whose frequency changes with time. The first fluid flow path is constituted by flowing an alternating current of a wave and processing the fluid flowing through the first fluid flow path or the second fluid flow path by a modulated electric field induced by the current flowing through the coil. A method for preventing and / or removing rust, scale, and other components on a wall, wherein the modulated electric field treatment is performed after removing a cationic drug that inhibits the modulated electric field treatment of a fluid. Prevents rust, scale and other components from adhering and / or
Or a removal method. 2. The cationic drug includes a surfactant, an anticorrosive containing a polymer drug and a phosphate drug, a tin can, a scale inhibitor, a slime inhibitor, an antistatic agent, and a rinse (dry finish). 2. The rust of the fluid flow path according to claim 1, wherein the agent is at least one selected from the group consisting of an agent, a floor wax agent, an antifoaming agent, and a marine organism adhesion inhibitor.
A method for preventing and / or removing scale and other components. 3. A coil having a coil wound around a surface of the first fluid flow path or a second fluid flow path for a fluid to be introduced into the first fluid flow path, wherein the coil has a rectangular shape whose frequency changes with time. The first fluid flow path is constituted by flowing an alternating current of a wave and processing the fluid flowing through the first fluid flow path or the second fluid flow path by a modulated electric field induced by the current flowing through the coil. In a method for preventing and / or removing rust, scale, and other components on wall surfaces, the modulated electric field treatment is performed after adding an anionic agent that promotes the modulated electric field treatment of a fluid. Prevents rust, scale, and other components from adhering and / or
Or a removal method. 4. A coil around a surface of a first fluid flow path or a second fluid flow path for a fluid to be introduced into the first fluid flow path, wherein the coil has a rectangular shape whose frequency changes with time. The first fluid flow path is constituted by flowing an alternating current of a wave and processing the fluid flowing through the first fluid flow path or the second fluid flow path by a modulated electric field induced by the current flowing through the coil. In a method for preventing and / or removing rust, scale, and other components on a wall surface, the method further includes performing the modulated electric field treatment after adding sodium carbonate, sodium hydrogen carbonate, or sodium hydroxide, which promotes the modulated electric field treatment of a fluid. A method for preventing and / or removing rust, scale, and other components from a fluid channel. 5. A square wave whose frequency changes with time, wound around a surface of a first fluid flow path through which a fluid flows or a surface of a second fluid flow path of the fluid introduced into the first fluid flow path. Rust on the wall constituting the first fluid flow path in which a coil for inducing a modulation electric field and a power supply device having a control system for flowing the current through the coil is provided,
A fluid flow path, characterized in that a scale, or another adhesion preventing and / or removing device, is provided with a means for adding an anionic drug, sodium carbonate, sodium hydrogen carbonate or sodium hydroxide, which promotes the modulated electric field treatment of the fluid. For preventing and / or removing rust, scale and other components. 6. A desk test method for water to be treated for testing the effect of a modulated electric field treatment of a fluid for preventing and / or removing rust, scale, and other adhesion of a wall constituting a fluid flow path, An alternating current of a square wave that changes over time is passed, and the same fluid as the fluid flowing in the fluid flow path is passed inside a pipe arranged in an inclined shape wound with a coil that induces a modulated electric field in the fluid by the current. After a part of the fluid subjected to the modulated electric field treatment that has passed through the pipe is dropped on a glass plate, it is dried at room temperature, and the change at the interface of the dried body on the dried glass is confirmed with a microscope. Then, rust on the wall surface constituting the fluid flow path to determine the degree of the effect of the modulated electric field treatment of the fluid, rust, scale,
A desk test method for water to be treated for testing the effect of a modulated electric field treatment of a fluid for preventing and / or removing other substances from adhering. 7. A desk test apparatus for water to be treated for testing the effect of a modulated electric field treatment of a fluid for preventing and / or removing rust, scale, and the like on a wall constituting a fluid flow path, An alternating current of a square wave whose frequency changes with time is passed, and a coil that induces a modulated electric field in the fluid by the current is wound, and is disposed in an inclined shape through which the same fluid as the fluid flowing in the fluid flow path is passed. Test equipment with water to be treated equipped with pipes. 8. A rectangular coil whose frequency changes with time, wherein a coil is wound around the surface of the first fluid flow path or the second fluid flow path for a fluid to be introduced into the first fluid flow path. The first fluid flow path is constituted by flowing an alternating current of a wave and processing the fluid flowing through the first fluid flow path or the second fluid flow path by a modulated electric field induced by the current flowing through the coil. In the method for preventing and / or removing rust, scale, and other components on the wall surface, first, a test is performed by the desk test method according to claim 6, and if the result of the desk test method is not good, the electric power is output. And / or removing the agent that inhibits the modulated electric field treatment, and then performing the modulated electric field treatment, thereby preventing and / or removing rust, scale, and other components from the fluid flow path. 9. The agent that inhibits the modulated electric field treatment includes a surfactant, an anticorrosive including a polymer-based agent and a phosphate-based agent, a cleaning agent, a scale inhibitor, a slime inhibitor, an antistatic agent, Rinse (dry finish) agent, floor wax agent, defoamer,
9. The method for preventing and / or removing rust, scale, and other components of a fluid flow path according to claim 8, wherein the method comprises at least one selected from the group consisting of a marine organism adhesion inhibitor and a suspended substance.