Structure for inhibiting adhesion of marine organisms and method for producing the same

Abstract

To suppress the adhesion of marine organisms over a long period of time.SOLUTION: This antifouling cement material is arranged in a seawater passage and formed by mixing an antifouling aqueous solution containing at least 15.84 to 16.83 wt.% paraffin wax and 3.41 to 3.85 wt.% acrylic resin with aggregate and cement, stirring and kneading the mixture to prepare an antifouling cement mixed material and curing and bonding the antifouling cement mixed material. Since the paraffin wax fills the air bubbles formed on the wall surface of the antifouling cement material when the antifouling cement admixture is cured and bonded, the shellfish cannot allow the secreted mucus to enter the air bubbles.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a marine organism adhesion prevention structure and a method for manufacturing the same. [Background technology]

[0002] In conventional power plants such as thermal power plants and nuclear power plants, for example, in thermal power plants, steam generated in a boiler is sent to a steam turbine to drive the steam turbine, and the rotation of the steam turbine is transmitted to a generator to drive the generator. The steam that drives the steam turbine is condensed in a condenser to become condensate, and the condensate is then returned to the steam generator.

[0003] When a thermal power plant is located on the coast, seawater is used as a cooling medium to condense steam in the condenser. Seawater is taken in through a water intake, and is supplied to a heat exchanger installed in the condenser by a circulating water pump through a water intake channel. After cooling the heat exchanger, the seawater is discharged into the sea through a discharge channel.

[0004] However, if marine organisms such as mussels and barnacles secrete mucus and attach to the walls of the intake and discharge channels, the cross-sectional area of ​​the intake and discharge channels will become smaller, making it impossible to take in a sufficient amount of seawater from the intake port or release it from the discharge port. This will prevent sufficient steam from being condensed in the condenser, reducing the efficiency of the generator or causing it to break down.

[0005] In particular, when the intake and discharge channels are made of concrete, the mucus secreted by the shellfish penetrates into air bubbles formed on the concrete walls and adheres to the walls, which can damage the intake and discharge channels as the shellfish grow.

[0006] Possible methods of removing shellfish that have attached to the walls of intake and discharge channels include using robots to scrape them off, spraying them with ultra-high pressure cleaning water, or covering the walls with a shell adhesion prevention barrier to prevent shellfish from attaching to the walls of intake and discharge channels.However, all of these methods are not only cumbersome, but also increase the running costs of the thermal power plant.

[0007] Therefore, an antifouling technique has been proposed in which an antifouling paint that is applied to the bottom of a ship or the like is applied to the wall surface to form an antifouling coating film.

[0008] In this antifouling technology, a vinyl ester resin-based or unsaturated polyester-based primer is applied to the surface of the substrate, and then a silicone resin-based antifouling paint is applied to the surface of the primer to form an antifouling coating film (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 10-296175 Summary of the Invention [Problem to be solved by the invention]

[0010] However, in the above antifouling techniques, the antifouling coating film may be damaged over time due to impacts from the current of seawater, and the durability of the antifouling coating film is low, making it impossible to prevent the attachment of marine organisms for a long period of time.

[0011] The present invention aims to solve the problems of the conventional antifouling techniques and to provide a marine organism adhesion-preventing structure that can suppress adhesion of marine organisms for a long period of time, and a method for manufacturing the same. [Means for solving the problem]

[0012] To this end, the marine organism adhesion-inhibiting structure of the present invention is disposed in a seawater flow path and comprises an antifouling cement material formed by mixing an antifouling aqueous solution containing at least 15.84 [wt %] or more and 16.83 [wt %] or less of paraffin wax and 3.41 [wt %] or more and 3.85 [wt %] or less of acrylic resin, aggregate, and cement, stirring and kneading the mixture to produce an antifouling cement mixture, and then hardening and bonding the mixture. [Effects of the Invention]

[0013] According to the present invention, the marine organism adhesion prevention structure is disposed in a seawater flow path and comprises an antifouling cement material formed by mixing an antifouling aqueous solution containing at least 15.84 [wt %] or more and 16.83 [wt %] or less of paraffin wax and 3.41 [wt %] or more and 3.85 [wt %] or less of acrylic resin, aggregate, and cement, stirring and kneading the mixture to produce an antifouling cement mixture, and then hardening and bonding the mixture.

[0014] In this case, the paraffin wax fills the air bubbles that form on the wall of the antifouling cement material when the antifouling cement mixture hardens and bonds, so the shellfish cannot penetrate the mucus they secrete into the air bubbles that form on the wall of the antifouling cement material.

[0015] Therefore, adhesion of the shellfish antifouling cement material to the wall surface can be suppressed for a long period of time. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a conceptual diagram of a thermal power plant according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view of a pipe formed from antifouling concrete in a first embodiment of the present invention. [Figure 3] FIG. 10 is a cross-sectional view of an open channel formed using antifouling concrete in a second embodiment of the present invention. [Figure 4]FIG. 10 is a cross-sectional view of an open culvert formed by applying antifouling mortar to the side walls and bottom walls of the open culvert in a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In this case, a marine organism adhesion prevention structure disposed in a water intake channel serving as a seawater flow path in a thermal power plant serving as a power generation plant, and a method for manufacturing the same will be described.

[0018] FIG. 1 is a conceptual diagram of a thermal power plant according to a first embodiment of the present invention.

[0019] In the figure, 11 is a thermal power plant located facing the sea Se, 12 is a boiler building which is the first building, and 13 is a turbine building which is the second building.

[0020] The boiler building 12 includes a boiler 21 as a steam generator, a steam drum 22 as a gas-liquid separator arranged above the boiler 21, and a steam pipe 25 as a steam generating section arranged along the wall of the combustion chamber 24 within the boiler 21 to heat water supplied from the steam drum 22, generate steam, and send it to the steam drum 22.

[0021] The turbine building 13 also includes a steam turbine 31 that is driven by steam energy and generates rotational force, a generator 32 that is connected to the steam turbine 31 and is driven by the rotation of the steam turbine 31 to generate electricity, and a condenser 33 that cools and condenses the steam after the rotation is generated in the steam turbine 31. The condenser 33 includes a heat exchanger 36 inside a casing 35.

[0022] The steam drum 22 and the steam turbine 31 are connected by a steam flow path 38, and the condenser 33 and the steam drum 22 are connected by a water flow path 39. Steam is generated in the steam pipe 25 and separated into steam by the steam drum 22, and is sent to the steam turbine 31 via the steam flow path 39. Water condensed in the condenser 33 is sent to the steam drum 22 via the water flow path 39, and then sent to the steam pipe 25.

[0023] In the condenser 33, seawater is used as a cooling medium to cool and condense the steam.

[0024] To this end, the heat exchanger 36 is connected to a water intake channel L1 as a first seawater flow path for taking in seawater and supplying it to the condenser 33, and to a discharge channel L2 as a second seawater flow path for discharging the seawater into the sea Se after cooling the steam in the condenser 33. A circulation pump P for circulating seawater is disposed at a predetermined position of one of the water intake channel L1 and the discharge channel L2, in this embodiment, the water intake channel L1.

[0025] Furthermore, a water intake port 43 for taking in seawater is formed at the end of the water intake channel L1 on the sea Se side, and a discharge port 44 for discharging seawater is formed at the end of the discharge channel L2 on the sea Se side.

[0026] However, since the intake 43 and the discharge 44 face the sea Se, if marine organisms such as mussels and barnacles float and enter the walls of the intake channel L1 and the discharge channel L2, and secrete mucus and attach to them, the cross-sectional area of ​​the intake channel L1 and the discharge channel L2 will become smaller, making it impossible to take in a sufficient amount of seawater from the intake 43 or release it from the discharge channel 44. As a result, steam cannot be sufficiently condensed in the condenser 33, which will reduce the efficiency of the generator or cause it to break down.

[0027] Furthermore, in the intake channel L1, negative pressure is generated as seawater is circulated by the pump P, which can cause shellfish to enter areas far from the intake port 43 and attach to the pump P, damaging it.In such cases, seawater cannot be taken in at the intake port 43.

[0028] Furthermore, if the intake channel and discharge channel are made of concrete, the mucus secreted by the shellfish will enter the air bubbles formed on the concrete wall and adhere to the wall. As the shellfish grow, the solidified deposits in the air bubbles will become larger, which may damage the intake channel L1 and discharge channel L2.

[0029] Therefore, in this embodiment, an antifouling aqueous solution is prepared using a plurality of predetermined paint raw materials, and antifouling concrete is formed as an antifouling cement-based material based on the antifouling aqueous solution. A secondary product, a pipe, is manufactured from the antifouling concrete, and the pipe is arranged as a structure for inhibiting adhesion of marine organisms in an area Pr1 extending a predetermined distance from the intake 43 in the intake channel L1.

[0030] FIG. 2 is a perspective view of a pipe formed from antifouling concrete in the first embodiment of the present invention.

[0031] In the figure, 51 is a pipe made of antifouling concrete, 53 is a socket formed at one end of the pipe 51, 54 is a spigot formed at the other end of the pipe 51, and 56 is a seal for sealing disposed on the inner periphery of the socket 53. The spigots 44 are inserted into the sockets 43 of multiple pipes 51 via the seals 56, and the pipes 51 are connected to form the water intake channel L1.

[0032] Next, a method for manufacturing the tube 51 will be described.

[0033] First, a plurality of predetermined paint raw materials are mixed to prepare an antifouling aqueous solution containing the following components in the respective component ratios.

[0034] The antifouling aqueous solution contains, as main components, paraffin wax at 15.84 [wt %] or more and 16.83 [wt %] or less and acrylic resin at 3.41 [wt %] or more and 3.85 [wt %] or less, as secondary components, refined mineral oil at 3.30 [wt %], nonionic surfactant at 2.64 [wt %] or more and 3.96 [wt %] or less, and polyethylene oxide at 1.32 [wt %] or more and 1.98 [wt %] or less, as additives, ethylene glycol at 0.11 [wt %] or more and 0.15 [wt %] or less and ammonia at 0.04 [wt %] or more and 0.08 [wt %] or less, and water at 70.42 [wt %] or more and 74.16 [wt %] or less as a solvent, and the total weight is 10 [kg].

[0035] In the antifouling aqueous solution, the amount of paraffin wax can be increased by 3% by weight or more and 5% by weight or less, and the amount of water can be reduced accordingly.

[0036] For example, if the amount of paraffin wax is increased by 3% by weight to a value not less than 18.84% by weight and not more than 19.83% by weight, the amount of water is reduced by 3% by weight to a value not less than 67.42% by weight and not more than 71.16% by weight.

[0037] Also, for example, if the amount of paraffin wax is increased by 5% by weight to 20.84% ​​by weight or more and 21.83% by weight or less, the amount of water is reduced by 5% by weight to 65.42% by weight or more and 69.16% by weight or less.

[0038] The paraffin wax is a white wax whose main component is a straight-chain hydrocarbon (normal paraffin) with a melting point of 47°C to 69°C, a carbon number distribution of approximately 20 to 40, and a molecular weight of approximately 300 to 550, and has high water repellency and waterproof properties.

[0039] The acrylic resin and polyethylene oxide are components that allow the cement to harden and bond properly.

[0040] Next, the antifouling aqueous solution is poured into the reaction tank, followed by gravel as coarse aggregate, which is aggregate that will retain 85% or more by mass through a 5 mm mesh sieve, and cement, and the mixture is mixed, stirred, and kneaded using a stirring device to prepare an antifouling cement mixture.

[0041] The rotation speed of the agitator is set to a speed at which a vortex is formed in the center of the reaction vessel, and the agitation time of the agitator is set to approximately 60 to 90 minutes.

[0042] Next, the antifouling cement mixture is poured into a mold, hardened and bonded in the mold, and then removed from the mold to form a pipe 51 made of antifouling concrete as the antifouling cement material.

[0043] Here, the paraffin wax fills air bubbles that form on the wall of the pipe 51 when the antifouling cement mixture hardens and bonds in the mold.

[0044] Therefore, when a pipe 51 is arranged in the area Pr1 of the intake channel L1 as a structure for preventing adhesion of marine organisms, shellfish cannot allow the mucus they secrete to enter the air bubbles formed on the wall of the pipe 51, and adhesion of shellfish to the wall can be prevented for a long period of time.

[0045] Furthermore, as the shellfish grow, the solidified deposits in the bubbles do not grow larger, so the intake channel L1 is not damaged.

[0046] Furthermore, in cold regions, seawater does not enter the air bubbles and freeze, so the intake channel L1 is not damaged.

[0047] Next, we will discuss a second embodiment of the present invention, in which a secondary product, an open channel, is formed using the antifouling concrete and the open channel is arranged in an area Pr1 that is a predetermined distance from the intake 43 in the intake channel L1 as a structure for preventing the adhesion of marine organisms.

[0048] FIG. 3 is a cross-sectional view of an open channel formed from antifouling concrete in the second embodiment of the present invention.

[0049] In the figure, L1 is a water intake channel, 61 is an open channel formed in the shape of a trench on the ground surface 62, and W is seawater supplied to the water intake channel L1.

[0050] The open channel 61 has side walls 64, 65 and a bottom wall 66, and the side walls 64, 65 and the bottom wall 66 are formed from antifouling concrete as the antifouling cement material.

[0051] Therefore, if an open channel 61 is arranged in the area Pr1 of the intake channel L1 as a structure for preventing adhesion of marine organisms, shellfish will not be able to infiltrate the air bubbles formed on the surfaces of the side walls 64, 65 and bottom wall 66 with their secreted mucus, and adhesion of shellfish to the wall surfaces can be prevented for a long period of time.

[0052] Furthermore, as the shellfish grow, the solidified deposits in the bubbles do not grow larger, so the intake channel L1 is not damaged.

[0053] Furthermore, in cold regions, seawater does not enter the air bubbles and freeze, so the intake channel L1 is not damaged.

[0054] Next, we will explain a third embodiment of the present invention, in which an antifouling mortar is formed as an antifouling cement-based material based on an antifouling aqueous solution, and the antifouling mortar is applied to the side walls and bottom walls of an open channel as a structure formed from concrete, and is arranged as a structure to inhibit the adhesion of marine organisms in an area Pr1 extending a predetermined distance from the intake 43 in the intake channel L1.

[0055] FIG. 4 is a cross-sectional view of an open culvert formed by applying antifouling mortar to the side walls and bottom walls of the open culvert in accordance with the third embodiment of the present invention.

[0056] In the figure, L1 is a water intake channel, 71 is an open channel formed in the shape of a trench on the ground surface 62, and W is seawater supplied to the water intake channel L1.

[0057] The open channel 71 is formed by applying antifouling mortar 77 as an antifouling cement material to side walls 74, 75 and a bottom wall 76 of an open channel 72 formed of concrete.

[0058] Next, a method for manufacturing the open channel 71 will be described.

[0059] First, a plurality of predetermined paint raw materials are mixed to prepare an antifouling aqueous solution similar to that of the first embodiment.

[0060] Next, the antifouling aqueous solution is poured into a reaction tank, followed by sand as fine aggregate, which is aggregate that passes through a 5 mm mesh sieve at a rate of 85% or more by mass, and cement, and the mixture is mixed, stirred, and kneaded using a stirring device to prepare an antifouling cement mixture.

[0061] Next, the antifouling cement mixture is applied as antifouling mortar 77 to the side walls 74, 75 and bottom wall 76 of the open channel 72 formed of concrete.

[0062] As a result, an open channel 71 coated with antifouling mortar 77 is formed.

[0063] Therefore, if an open channel 71 is arranged in the area Pr1 of the intake channel L1 as a structure for preventing adhesion of marine organisms, the shellfish will not be able to infiltrate the air bubbles formed on the wall surface of the antifouling mortar 77 with the mucus they secrete, and adhesion of shellfish to the wall surface can be prevented for a long period of time.

[0064] Furthermore, as the shellfish grow, the solidified deposits in the bubbles do not grow larger, so the intake channel L1 is not damaged.

[0065] Furthermore, in cold regions, seawater does not enter the air bubbles and freeze, so the intake channel L1 is not damaged.

[0066] In each embodiment, an example is described in which the antifouling cement material is used in a seawater flow path of a power plant formed along a coast. However, the present invention is not limited to the seawater flow path of a power plant, and can be applied to structures that come into contact with seawater in facilities formed along a coast, as well as structures that come into contact with seawater in facilities formed on or under the sea.

[0067] The present invention is not limited to the above-described embodiment, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention. [Explanation of symbols]

[0068] L1 intake channel 51 tube 61,71 Open drain

Claims

1. A marine organism adhesion-inhibiting structure disposed in a seawater flow path, characterized in that it is made of an antifouling cement material formed by mixing an antifouling aqueous solution containing at least 15.84% by weight or more and 16.83% by weight or less of paraffin wax and 3.41% by weight or more and 3.85% by weight or less of acrylic resin, aggregate, and cement, and then stirring and kneading the mixture to create an antifouling cement mixture, and then hardening and bonding the mixture.

2. (a) The aggregate is a coarse aggregate. (b) the antifouling cement mixture is antifouling concrete; and (c) the antifouling cement mixture is antifouling concrete.

3. (a) The aggregate is fine aggregate. (b) the antifouling cement mixture is an antifouling mortar; and (c) the antifouling cement mixture is a structure for inhibiting adhesion of marine organisms according to claim 1.

4. 4. The marine organism adhesion-inhibiting structure according to claim 3, wherein the antifouling mortar is applied to a structure made of concrete.

5. (a) preparing an antifouling aqueous solution based on a plurality of coating materials, the aqueous solution containing at least 15.84 [wt %] or more and 16.83 [wt %] or less of paraffin wax and 3.41 [wt %] or more and 3.85 [wt %] or less of acrylic resin; (b) adding the antifouling aqueous solution, aggregate, and cement to a reaction tank, mixing them, stirring, and kneading them to prepare an antifouling cement mixture; (c) A method for producing a marine organism adhesion-inhibiting structure, characterized in that the antifouling cement mixture is hardened and bonded to form an antifouling cement material.

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