TW201834927A - System for enhancing corrosion protection of a marine structure - Google Patents

Abstract

A system enhances corrosion protection of a protected surface (30) of a marine structure (110) in contact with a liquid containing biofouling organisms. The protected surface is electrically conductive and is protected against corrosion by impressed current cathodic protection (ICCP). The system has a light emitting arrangement (100) comprising a light source (20) for emitting anti-fouling light (22). The light emitting arrangement is arranged to emit the anti-fouling light from the light source towards a zone of the protected surface (30). Effectively biofouling is prevented and the operation of the ICCP is enhanced when the marine structure is partly immersed in the fouling liquid.

Description

System for improving corrosion protection of maritime structures

The present invention relates to a method, system and apparatus for improving corrosion protection of a protected surface of a marine structure containing liquid in one of the biofouling organisms. Maritime structures are metal structures in a variety of humid environments, such as pipelines, wind turbines, steel pier piles, offshore oil platforms, offshore wind farm foundations, wind turbine single piles, wind turbine non-single pile supports, oil rigs, tidal energy And / or wave energy acquisition structure. The liquid containing the biofouling organism can be any aqueous or oily environment, especially seawater. In general, corrosion causes such structural weakening. Biofouling accelerates corrosion, which can cause so-called pitting. The invention is applicable to the reduction or prevention of corrosion of such marine structures in contact with liquids.

Cathodic protection allows a conductive surface to act as a cathode, a technique for reducing corrosion of a metal surface by making a metal surface a cathode of an electrochemical cell. The passive protection method connects the metal to be protected to a more corrosive sacrificial metal to act as an anode. The sacrificial metal is then etched instead of the protected metal. Passive plating cathodic protection may not be sufficient for a variety of reasons. An external DC power source can be used to provide a current sufficient to cause the protected surface to have a potential to prevent corrosion relative to the liquid. This method is commonly referred to as impressed current cathodic protection (ICCP). The impressed current cathodic protection system protects a wide range of maritime structures. The ICCP aims to prevent corrosion by creating a potential on the metal to be protected; the required potential is 0.8 V to 0.9 V.

It has been found from the foregoing that impressed current cathodic protection measures are effective in reducing corrosion of immersed and even buried protected surfaces. However, corrosion is still a problem at some protected surfaces of a submerged marine structure that is protected by ICCP. One of the objects of the present invention is to improve the corrosion protection of the surface of a marine structure in contact with a liquid containing one of the biofouling organisms. According to the present invention, there is provided a system for enhancing corrosion protection of a protected surface of a marine structure in contact with a liquid containing one of the biofouling organisms, the protected surface being electrically conductive and protected by impressed current cathodic protection corrosion. The system includes a lighting configuration including a light source for emitting anti-fouling light, the lighting configuration configured to emit the anti-fouling light from the light source toward an area of the protected surface. According to another aspect of the present invention, there is provided a maritime structure having a protected surface, and more particularly to a support structure for a sea-based wind turbine configured to conduct electricity to contain biofouling organisms One of the liquid contacts is protected against corrosion by impressed current cathodic protection, the marine structure comprising the system described above, wherein the illumination configuration is configured to emit anti-fouling light toward the area of the protected surface. According to another aspect of the present invention, there is provided a maritime structure having a protected surface, and more particularly to a support structure for a sea-based wind turbine configured to conduct electricity to contain biofouling organisms One of the liquid contacts is protected against corrosion by impressed current cathodic protection (ICCP), which is configured to receive the aforementioned system. The maritime structure may, for example, comprise one or more coupling elements for coupling the maritime structure and the aforementioned system to each other. The maritime structure can include a first guiding element configured to cooperate with a second guiding element on a distance holder for maintaining a light source included in the system and the marine structure An area is separated by a predetermined distance to provide at least a predetermined intensity of the anti-fouling light at the area. According to another aspect of the present invention, there is provided a method of enhancing corrosion protection of a protected surface of a marine structure in contact with a liquid containing one of the biofouling organisms, the protected surface being electrically conductive, the method comprising The protected surface provides impressed current cathodic protection and powering a source to emit anti-fouling light toward an area of the protected surface. The above features have the effect of preventing fouling light from reaching the protected surface when practicing the present invention. The maritime structure is protected against corrosion by impressed current cathodic protection (ICCP), requiring the protected surface to be electrically conductive and in contact with the liquid. However, the inventors have found that corrosion still occurs and one of the causes of this phenomenon may be biofouling. ICCP reduces corrosion but may become less effective due to biofouling. Biofouling has been found to locally reduce the effectiveness of ICCPs that function within the normal operating voltage range of 0.8 V to 0.9 V. Therefore, corrosion acceleration can occur due to the influence of microorganisms at the surface of one of the ICCP protections. It has been found that killing the bacteria or maintaining a distance from the bacteria is necessary to maintain the effects of ICCP. This has been achieved by combining the ICCP and the light source to emit anti-fouling light toward the area of the protected surface. Anti-fouling (eg, UV(C)) will reduce biofouling so that the ICCP can continue to protect the protected surface from corrosion. When the marine structure is partially submerged in a liquid (commonly referred to as a liquid line), the region may include a portion (generally referred to as a tidal portion or a splash portion) positioned at a level of the liquid. The tidal part is partly due to tidal coverage of different liquid levels. For example, due to waves, the splash portion of the waterline just outside the maritime structure can be intermittently exposed to both water and air. In the system, the illumination configuration can be constructed or positioned to emit the anti-fouling light from the source toward the area at or around the liquid line (eg, the area having the tidal portion and/or the splash portion). The ICCP system relies on the conductivity of water but is ineffective on the waterline. Any dry metal portion on the surface of the liquid is unprotected by the absence of electrical current. In addition, the inventors have discovered that impressed current cathodic protection is less effective for intermittently wet protected surfaces, for example, due to changes in tides, waves or currents in one of the seawater, protected surfaces of partially submerged marine structures. It can become wet regularly but not continuously. It can be enriched in bacteria in a film of water that is being dried. By applying anti-fouling light (e.g., UV light) to one of the areas of the liquid line, this fouling is prevented and accelerated corrosion of the tidal and/or spattered portions is reduced. In such areas that are particularly susceptible to corrosion due to fouling, accelerated corrosion is effectively prevented by emitting anti-fouling light toward the ICCP assembly toward such portions. Furthermore, the surface under the waterline can be prone to biofouling, which reduces the efficiency of the ICCP. This region may include an immersion portion positioned below the liquid level of the liquid. Biofouling is prevented by providing an anti-fouling light on the immersed portion that is strong enough to kill or maintain a distance from the bacteria to reduce or prevent microbial induced corrosion. Advantageously, the ICCP can still act on the immersed portion of the area due to the anti-fouling light remaining in the immersed portion from biofouling. Optionally, the illumination configuration includes a float for positioning the illumination configuration at the region. By floating the device, the area of the protected surface at the liquid line (e.g., the waterline of the seawater) is protected by anti-fouling light. When the device is floating, the illumination configuration is automatically at one of the desired levels, for example, during installation, and can follow a vertical change in liquid level (eg, due to tides), so the device is positioned in the area One of the required vertical positions. The surface of the internal space of the maritime structure (such as a single pile) can be easily biofouled around the waterline. Optionally, the device is shaped to be movably fitted within an interior space of the maritime structure formed by the inner surface of the wall of the interior space. The device may also include the above float. Advantageously, in use, the inner surface of the marine structure receives anti-fouling light near the liquid line, wherein the ICCP is less effective. By being shaped to be movably fitted within the interior space and optionally floating within the interior space, the device can follow a vertical change in water level (e.g., due to tidal conditions) while maintaining a horizontal position by a suitable shape. For example, there may be a circular interior space in a single pile. The device can have an outer boundary of a substantially circular shape for movably fitting within the interior space. Advantageously, the distance between the light source and the area is maintained within a predetermined boundary. Optionally, the system includes a distance holder for maintaining the light source at a predetermined distance from the area to provide at least a predetermined intensity of the anti-fouling light at the area. During operation, the device is held within a distance of the protected surface by the distance holder. For example, the distance holder can be formed by some shock absorber, bumper or fender at the outer boundary of the device, at the liquid line. Optionally, the distance holder includes a guiding element to be coupled to the maritime structure, the guiding element being configured to maintain the illuminating configuration a predetermined distance from the area as the height of the liquid level changes. The distance holder can include a guiding element that positions the device at a distance from the protected surface. The maritime structure and a portion of the distance holder remain at a fixed position while the height of the liquid level changes. A portion of the distance holder attached to or as part of the lighting configuration can cooperate with the stationary portion. Thus, one of the first guiding elements attached to the maritime structure can cooperate with one of the second guiding elements on the distance holder. Optionally, the distance holder is configured to couple to a fixed point. For example, the fixed point can be a fixed point of the maritime structure or an anchor pin drilled into the seabed to provide guidance. The distance holder may be an anchoring chain or a suspension configuration coupled to a fixed point of the maritime structure to maintain a predetermined position of the floating device relative to the maritime structure, for example, to the maritime structure in which the device remains floating One of the inner spaces is one of the center suspension points of the submarine cable, or one or more of the sea rope or submarine cable to one or more fixed points on or under the device. Optionally, the illumination configuration is configured to move the light source relative to the region in a direction parallel to the liquid surface and/or perpendicular to one of the liquid surfaces. Light emitted from the light source can be configured to move horizontally along the protected surface in use. For example, the light source itself or a mirror can be configured to move along a track. Again, the device or the lighting configuration can be configured to rotate in use for movement of the light source. In practice, the light source can be adapted to emit ultraviolet light. The general advantage of using UV light to achieve biofouling is to prevent microbial adhesion and rooting on the surface to keep it clean without any harmful side effects or side effects that cannot be easily offset. Optionally, the system includes an applied current unit for providing an applied current cathodic protection (ICCP) to the protected surface. Advantageously, the control and/or power supply of the ICCP and the light source can be combined. The present invention is applicable to various backgrounds of maritime structures, which then include the above systems. For example, the system according to the invention can be applied to a single pile carrying a wind turbine, or a ship. The maritime structure resists corrosion of one surface when in contact with a liquid containing one of the biofouling organisms. The protected surface is electrically conductive and protected by impressed current cathodic protection, while the marine structure includes the system described above to increase the efficiency of the ICCP by means of anti-fouling. The illuminating configuration can float at the surface of the liquid and can be positioned within a predetermined distance from the region by a distance holder. Furthermore, it is foreseen that the above system is used to enhance the corrosion protection of one of the protected surfaces of a marine structure when partially immersed in a liquid containing one of the biofouling organisms. The use includes providing impressed current cathodic protection via an electrically conductive protected surface and powering the source to emit anti-fouling light toward the area. The above and other aspects of the present invention will be apparent from and elucidated with reference to the appended claims.

In order to cope with the natural corrosion of a steel maritime structure, the surface may be coated or painted, and additionally equipped with a passive or active cathodic protection system, such that the structure resists natural corrosion even if the protective coating partially fails. Passive systems use sacrificial zinc, aluminum or iron anodes that are electrochemically dissolved over time, while active systems are fabricated using MgMO-Ti (mixed metal oxide) coated titanium or Pt/Ti (platinum coated titanium) When the anode is applied, a DC current is applied. Active systems, such as Impressed Current Cathodic Protection (ICCP), apply a DC current to the seawater, but need to be carefully monitored because excessive current can locally dissolve the hull at an increased rate. This document focuses on improving the active impressed current cathodic protection to function at a relative electrochemical potential of normal operation from 0.8 V to 0.9 V relative to Ag/AgCl/seawater or where applicable. Impressed current cathodic protection (ICCP) reduces corrosion. However, ICCP can only function underwater and when the metal is not insulated from current. Accelerated corrosion has been found to be caused by microbial organisms in marine structures, even if they are protected by ICCP. Since ICCP may not be sufficient to protect some areas from corrosion, it is recommended to provide anti-fouling (such as UVC) to complement ICCP. Anti-fouling light is effective on the water and prevents the biofilm from causing galvanic insulation under water. The combination of ICCP and UVC radiation, for example, enhances protection by contacting areas where the ICCP is inactive and keeping the area free of biofilm (which would otherwise hinder the ICCP system). Exposure to water during at least a portion of the life of the surface is a known phenomenon that causes substantial problems in many fields. For example, in the maritime sector, it is known that biofouling on a hull causes a significant increase in the drag of the vessel and thus increases the fuel consumption of the vessel. Thus, users of ICCPs on stationary maritime structures are not interested in anti-fouling measures because the fouling itself does not cause problems. For example, a support structure for a sea-based wind turbine does not suffer from an increase in drag due to large biofouling as a ship. In general, biofouling is the accumulation of microbial organisms, plants, algae, small animals and the like on the surface. It is estimated that more than 1,800 species (including more than 4,000 organisms) are the cause of biofouling. Therefore, biofouling is caused by various organisms, and involves far more than barnacles and algae adhering to the surface. Biofouling is divided into microbial fouling (which includes biofilm formation and bacterial adhesion) and large biofouling (which involves the attachment of larger organisms). The organism is also classified as a hard organism or a soft organism due to the unique chemical and biological properties that determine what prevents its sedimentation. Hard fouling organisms include calcareous organisms such as barnacles, shell bryozoites, mollusks, polychaetes and other tubeworms, and zebra mussels. Soft fouling organisms include non-calcium organisms such as seaweed, water, algae, and biofilm "mucus." These organisms together form a fouling group. Waste from bacteria can contain substances that can erode steel, such as sulfuric acid. In maritime structures, corrosion can be at least partially attributed to biofouling, commonly referred to as microbial induced corrosion (MIC). Biofilm formation can be reduced by using a higher potential (e.g., 0.95 V to 1.1 V) in an ICCP-like system. This can be referred to as impressed current anti-fouling (ICAF). When the bacteria are in contact with a metal surface that has been negatively charged at the higher potential, the resulting repulsive force reduces the adhesion of the bacteria to the surface. A similar system can be designed to prevent fouling by dissolving Cu ions in water. Various other systems are known to reduce biofouling. The book "Microbiologically Influenced Corrosion" by Javaherdashti, in particular Chapter 9, pages 133 to 158, provides an overview of various known systems for reducing MIC. Chapter 9.2.2 discusses various shortcomings of UV radiation, especially UV treatment. The following is mentioned by using ultraviolet light for biofouling as suggested. The light source can be selected to specifically emit c-type ultraviolet light (also known as UVC light) and, more specifically, to have a wavelength of light between approximately 220 nm and 300 nm. In practice, the peak efficiency is achieved around 265 nm, and the higher the wavelength, the lower the peak efficiency. At 220 nm and 300 nm, the efficiency drops to about 10%. In the following, the invention will be explained with reference to one of the application examples of a single wind turbine, which is one of the examples of a maritime structure that is generally protected by ICCP. Wind turbines are typically placed on a single pile. Corrosion due to microbial organisms is commonly referred to as microbial or bacterial corrosion, biological corrosion, microbial corrosion, or microbial induced corrosion (MIC), which is caused or contributed by microbial organisms, typically chemical autotrophs. Since the space is usually airtight, it is assumed that the inside of the single pile is not susceptible to such corrosion. Accelerated corrosion of surfaces protected by ICCP has been found to be attributable to such microbial organisms. An example of an offshore maritime structure that can be affected by a single pile system. However, any steel or metal structure can be protected by the proposed system. Figure 1 shows an example of a system for improving corrosion protection of a protected surface. The figure shows in a vertical intersection that the system has a luminescent configuration 100 and a maritime structure 110 partially immersed in a liquid 120 (e.g., seawater) containing one of the biofouling organisms. In this example, the maritime structure 110 is partially embedded in the soil 130, for example, schematically indicating a single pile for carrying a wind turbine or one of the legs of an oil platform. The marine structure has a protected surface 30 that is electrically conductive and protected from corrosion by impressed current cathodic protection, as described above. To provide impressed current cathodic protection, the maritime structure can be provided with an anode 112 while the steel portion of the structure forms the cathode. The illumination configuration 100 has a light source 20 for emitting anti-fouling light 22. The illumination configuration is configured to emit anti-fouling light from the source toward one of the protected surfaces 30. In this figure, the region is positioned at a height of one of the liquid levels, which is commonly referred to as liquid line 31. This region may have portions located below, at, and/or above the liquid line. The illuminating configuration 100 can have a float 50 for causing the device to float at the surface of the fouling liquid. Again, the system can have a distance holder 40 to maintain the device at a desired distance near one of the protected surfaces 30. The distance holder can be configured to couple to a fixed point of the maritime structure. In this example, the figure shows that the distance holder is a submarine cable suspended from a fixed point (not shown) of the maritime structure. The submarine cable may be flexible or may be guided via a pulley using a balancer to accommodate a change in liquid level and allow the device to remain floating on the liquid while being positioned at a desired distance from the protected surface. Optionally, the distance holder has a guiding element to be coupled to the maritime structure. The guiding element can be configured to maintain the illumination configuration at a predetermined distance from the area while the height of the liquid level changes. The maritime structure can have one of the further guiding elements in cooperation with the guiding elements on the distance holder. For example, the distance holder may have one or more vertical rods to be coupled to the maritime structure (eg, one of the inner platforms of the single pile welded from the water line), while the apparatus has a means for maintaining a predetermined Collaboration holes or eyes in a horizontal position. Furthermore, a central vertical submarine cable that cooperates with one of the central eyes of the device can constitute a guiding element. The submarine cable may be secured to the waterline or may have a weight pendant for holding the cable straight. In the illuminating configuration, the light source can have at least one light unit adjacent the liquid line, the unit configured to emit at least a portion of the anti-fouling light parallel to the surface of the fouling liquid while floating. The illuminating configuration can be constructed or positioned to emit anti-fouling light that is directed to a region having a tidal portion 35 just above the liquid line. Alternatively or additionally, some anti-fouling light may be directed to some higher portion of the area, such as a splash zone. The light power of the light source is selected to illuminate the tidal portion 35 at least sufficient to perform an anti-fouling intensity. Using a suitable light directing and/or focusing configuration to direct light toward the area reduces the required source optical power. Thus, it is well known to provide an electro-optical system of concentrated light at a region to be illuminated. The light source can be selected based on the following. It has been found that most fouling organisms are killed, become inactive, or become unrenewable by exposing them to a particular dose of ultraviolet light. One of the typical strengths that appear to be suitable for achieving biofouling is about 30 mW per square meter. In a given situation, especially at a given light intensity, light can be applied continuously or at a suitable frequency while maintaining an average of 30 mW/m2. Various types of UV light sources can be used. One or more LEDs may constitute a UVC source that can be used as a light source for a lighting configuration. In fact, LEDs can typically be included in relatively small packages and can consume less power than other types of light sources. In addition, LEDs can be fabricated to emit (ultraviolet) light of a variety of desired wavelengths, and can be highly controlled in terms of operational parameters, most notably output power. The maritime structure can have an interior space 115 that has a circular shape, for example, near the liquid line. The device is shown to float in the interior space. In the example as shown in FIG. 1, the light unit is positioned at a fixed center position in the interior space 115. Therefore, the anti-fouling light can be emitted within a range of 360 degrees. Optionally, in use, the device or the illumination configuration is configured to move the light source relative to the protected surface in a direction parallel to one of the surfaces of the fouling liquid while floating. A lighter unit of light power can be used while simultaneously moving the unit or light emitted by the unit along the protected surface and illuminating only a portion of the surface at any given time while covering the entire surface during the movement. In practice, to prevent fouling, a protected surface should receive an optical power of approximately 30 mW/m2. In air, the absorption of UVC light is negligible, but it is about 4%/cm in clean seawater. This results in different dissolutions on the waterline and below, as discussed below. Assuming that the single pile has an internal space of 7 m in diameter, on the waterline, a low power lamp of several watts/meter can keep the surface free of biofilm and free of bacteria causing MIC. If only the area near the waterline needs protection, a 5 watt TL lamp on a float is sufficient. In the example of Figures 1 and 2, in the illuminating configuration, the light source includes at least one light unit adjacent the liquid line, the unit configured to emit at least an anti-fouling light parallel to the surface of the fouling liquid while floating section. The light parallel to the surface illuminates the area 35 of the protected surface just above the liquid line 31. Figure 2 shows a further example of a system for improving corrosion protection of a protected surface. This figure is similar to FIG. 1 showing a lighting configuration 102 and a maritime structure 110, but differing from the holder. Like the apparatus of FIG. 1 and further examples, the illumination configuration has a light source 20 for emitting anti-fouling light 22. The illuminating configuration 102 has a distance holder 41 on a float 50 that is configured to float the device at a desired distance from the protected surface 30 at the surface of the fouling liquid. In this example, the figure shows the distance holder as a dish mounted on the float, the dish having a rounded edge that temporarily contacts the maritime structural wall to allow the device to be on the liquid Floating while being positioned loosely within the interior space 115 is positioned within a desired distance from the protected surface. For example, the device has an outer boundary of a circular shape adjacent the liquid line for movably fitting within an interior space having a similar shape. The complementary shaped distance retainer element may be part of the device, for example, integral with the float, for other shapes of the interior space or other portion of the marine structure to be protected. The distance holder may additionally or alternatively have a distance to the liquid line at the outer boundary of the device to hold the arm, shock absorber, bumper or fender to control the distance and avoid damage. Figure 3 shows an example of an anti-fouling one illumination configuration for a protected surface having a raised light unit. This figure is similar to FIG. 1 showing a lighting arrangement 103 and a maritime structure 110, but with different light sources. The illumination configuration 103 has a light unit 25 configured to be located at a distance from one of the liquid lines as a light source. The unit 25 is configured to emit at least a portion of the anti-fouling light toward the surface of the fouling liquid at an angle such that the anti-fouling portion reaches an immersed portion of one of the protected surfaces below the liquid line (as indicated by arrow 23) to Angled down at the surface of the liquid. The angled anti-fouling illumination is located just below the liquid line. Due to the absorption of the water, it is necessary to determine the optical power of the light unit, considering the distance that the light has to travel through the fouling liquid and the absorption as previously indicated. Absorption can be known in advance, but can also be measured periodically and the optical power of the light unit can be adjusted based on the measured absorption. To protect under the waterline, the light source can be positioned close to the protected surface because the antifouling light is absorbed by the seawater. For example, in a circular interior space, this can be accomplished by attaching a lighted belt to it, which is slowly rotated along the protected surface as appropriate. 4 shows a further example of one of the anti-fouling configurations for one of the protected surfaces of an immersed light unit. This figure is similar to FIG. 1 showing a lighting arrangement 104 and a maritime structure 110, but with a different source and distance holder. The illuminating configuration can have a float that floats at the surface of the liquid. Device 104 can be configured for use with a sub-surface and can have at least one light unit 27 mounted under a liquid line (eg, suspended below a waterline) as a light source in a lighting configuration. To mount the light unit, the device can have a rigid element (such as a lower row bar) or a flexible element (such as a submarine cable). In consideration of the absorption of the fouling liquid, the light unit 27 is configured to emit anti-fouling light from a short distance toward the protected surface such that most of the anti-fouling light reaches the immersed portion of one of the protected surfaces extending below the liquid line. 36. Due to the absorption of the fouling liquid, the light unit needs to be closer to the wall to prevent the formation of biofilm or other biofouling. Accordingly, the distance holder is configured to maintain the immersion light unit within a predetermined distance of the immersed portion, and to determine the predetermined distance and the optical power of the light unit in view of the absorption of the anti-fouling light by the fouling liquid. It can be calculated that the following configuration will be sufficient to prevent biofouling using UV lamps (eg, mercury gas lamps that remain within a predetermined distance). The estimated power is obtained for a region 36 having a height of 1 meter (i.e., the amount of power per height). For a single diameter D = 8 m, the surface of an altimeter is π * D * 1 m = 25 m2. When UV at a strength of 30 mW/m2 is required at the surface, the total UV light power = 25 * 30 mW / m2 UV = 750 mW UV. The corresponding electrical power (assuming an efficiency of approximately 30%) is 750 mW/30% = approximately 2.5 W. At a predetermined distance of 17 cm and a transparency of 85%/cm, the remaining strength is 6%, so the total average power required is about 2.5/6% = 35 W. Due to the loss of dispersion and the static nature of the lamp, the light energy emitted by one of the approximately 10 static lamps can only partially reach the protected surface, so in practice more power will be required, such as 165 W. During manufacture and/or installation of the device, the predetermined distance, the optical power of the light unit, and the absorption of the anti-fouling light by the fouling liquid can be determined, for example, according to the above examples. Optionally, the apparatus includes a control unit 61 configured to determine one or more of the following parameters: a predetermined distance, an optical power of the optical unit, an electrical power of the optical unit, an anti-fouling loss by the fouling liquid Absorption, actual amount of biofouling, etc. These parameters can be preset and/or dynamically adapted. The control unit can include various sensors for measuring respective parameters and/or can be connected via a network to receive one or more parameters. For example, the actual optical power from the light source to the protected surface can be measured via a UV sensor. For example, the parameters may be automatically updated by an operator according to a stylized schedule or via a remote connection to one of the control units. Based on the parameters, the optical power or electrical power of the light source can be controlled, and/or the movement of the light source can be adapted by the control unit. Furthermore, the control unit can generate a warning and/or error message, for example, when a light source fails. As with the apparatus of FIG. 1 and further examples, the apparatus shown in FIG. 4 has a distance retainer for holding the apparatus in the vicinity of the protected surface 30. The distance holder has a plurality of diagonal submarine cables 43 suspended from a central submarine cable 42 or a fixed point coupled to the maritime structure. The diagonal submarine cable is connected to a platform 44 mounted on the float 51. The platform is part of a lighting configuration that carries the light source. This distance holder can also be used in other embodiments. Alternatively or additionally, the device and/or the lighting configuration can be configured to rotate as indicated by an arrow. For example, the device can be rotated by rotating a central submarine cable 42 that is suspended from the center submarine cable 42 by an electric motor (not shown). Furthermore, at least a portion of the illumination configuration can be rotated, for example, by rotating a portion of the illumination configuration that carries the submerged light unit 27. While rotating, the submerged light unit 27 will also illuminate the other immersed portions 36' of the protected surface. When rotating, the illumination requires less power, for example, while rotating along the wall surrounding the axis of the maritime structure, a 50 watt/height lamp is required at approximately the same distance for the above calculation. It doesn't have to be too fast to rotate; it can be done once in a few hours. Rotating mechanisms can also be used in other embodiments of the device. Optionally, the device or the illumination configuration is configured to move the light source in a direction perpendicular to the surface of the fouling liquid relative to the protected surface in use. In one embodiment, the illumination configuration has a mechanism for moving the light unit up and down to cover a higher portion of the surface to be protected. For example, the illumination configuration 20 shown in FIG. 2 or the illumination configuration 25 shown in FIG. 3 can further be provided with a mechanism for slowly varying the height of the light source relative to the liquid line. Furthermore, the illumination configuration shown in FIG. 4 can have a mechanism to vary the height of the immersive light unit 27. Optionally, the light source can be embedded in an optical medium or coupled to an optical medium to direct light toward the protected surface. When the light source is adapted to emit ultraviolet light, it is advantageous for the optical medium to comprise an ultraviolet transparent material such as ultraviolet transparent polysiloxane. In a general sense, the fact that the optical medium includes a material configured to allow at least a portion of the anti-fouling light to spread through the optical medium can be understood to imply that the optical medium includes a material that is substantially transparent to anti-fouling light. The illumination configuration in accordance with the present invention may actually comprise an optical medium, a plurality of light sources, and possibly one or more mirrors. The optical medium of the illumination configuration can have any suitable shape and size, and a light source, such as an LED, can be dispersed throughout the optical medium. Light emitted by each of the light sources is directed by the optical medium and/or mirror toward the protected surface. Figure 5 shows a further example of one of the anti-fouling configurations for one of the protected surfaces of an LED foil. This figure is similar to FIG. 1 showing a lighting arrangement 105 and a maritime structure 110, but with a different source and distance holder. The illumination arrangement 105 has an LED foil 28 that covers at least a portion of one of the sidewalls of a float 52 as a light source. The LED foil includes a plurality of LED light units 29, which are shown as being spread across the foil. In this example, the illumination configuration has an LED foil disposed adjacent the liquid line at a boundary outside the device. The LED foil has an optical medium and at least one LED light unit embedded in the optical medium to emit anti-fouling light. The optical medium allows at least a portion of the anti-fouling light to propagate through the optical medium. Further examples of such a foil are described in WO 2014/188347 A1. Optionally, foil 28 further includes at least one mirror for reflecting anti-fouling light from LED light unit 29 toward the emitting surface of the optical medium. One of the back surfaces of the foil faces the device, and an emitting surface emits anti-fouling light in a direction toward one of the protected surfaces 30 while the device floats near the protected surface. The LED foil can be mounted under and over the liquid line to illuminate both a portion 37 of the protected surface immersed in the liquid line and a portion 37' of the protected surface just above the liquid line. As with the apparatus of FIG. 1 and further examples, the illumination arrangement 105 shown in FIG. 5 can have a distance holder and/or a float to hold the apparatus near the protected surface 30. The distance holder can be formed by the float itself, and in addition the float is designed to fit tightly within the interior space of the marine structure. In addition, the float can have numerous segments that are joined during installation. In a different embodiment, to accommodate the diameter of the float to the available interior space, the float can be constructed using a flexible material and made inflatable or fillable. The foil may also be flexible or may be suspended about the float without being secured to the outer wall of the float. The float is inflated at a desired height during installation. After inflation, the float can still move to remain floating and follow changes in the liquid line. Alternatively, the float can be inflated to fit into a fixed position. It will be apparent to those skilled in the art that the scope of the invention is not limited to the examples discussed above, but may be modified and modified in various ways. The present invention has been illustrated and described with respect to the drawings and the description The invention is not limited to the disclosed embodiments. The drawings are schematic, and the unnecessary details for the understanding of the present invention have been omitted and are not necessarily drawn to scale. Variations of the disclosed embodiments can be understood and effected by a person skilled in the art in the practice of the invention. For example, various embodiments of the illumination configuration can be combined to form a device having one of a plurality of light sources. In the scope of the patent application, the word "comprising" does not exclude other steps or elements, and the indefinite article "a" or "an" does not exclude the plural. The term "comprising", as used herein, is to be understood by the skilled artisan to cover the term "consisting of." Thus, the term "comprising" may mean "consisting of" in one embodiment, but in another embodiment may mean "containing or containing at least one of the defined species and optionally one or more Other species." Any element numbering in the scope of the patent application should not be construed as limiting the scope of the invention. The elements and aspects of the elements and aspects discussed in connection with a particular embodiment and other embodiments may be combined as appropriate. Therefore, the mere fact that certain measures are recited in mutually different sub-claims does not indicate that one of these measures cannot be optimized. In a general sense, one of the basic functions of the device and illumination arrangement according to the invention maintains a protected surface from biofouling. Accordingly, the present invention is applicable to all situations involving a risk of fouling where the protected surface is intended to be immersed in a liquid containing one of the biofouling organisms at least during part of its life. Seawater is one of the well-known examples of this fouling liquid. Thus, a maritime structure can have one surface that is protected by the illumination configuration described above. A illuminating configuration is then attached to the outer surface to prevent fouling of the outer surface when immersed in a fouling liquid containing one of the biofouling organisms. Similarly, a method for mounting the above-described illumination configuration includes the steps of attaching a illumination configuration to an outer surface of a marine structure to enhance corrosion of the outer surface when immersed in a fouling liquid containing one of the biofouling organisms protection. Further, a method for enhancing corrosion protection of a protected surface of a marine structure using one of the devices described above when immersed in a fouling liquid containing one of the biofouling organisms is provided. The method involves providing impressed current cathodic protection, for example by inducing a current from a DC power source via a conductive protected surface. The method can further involve floating the illuminating configuration near the protected surface and powering the light source to emit anti-fouling light. According to one aspect of the present invention, it is foreseen that the use of the above-described illuminating arrangement, in particular the illuminating arrangement mounted on a float near a protected surface of a marine structure, is partially immersed in one of the biofouling organisms Corrosion protection of the surface is enhanced when the liquid is fouled. This application requires a power supply to power the lighting configuration. Other examples of protected surfaces include the surface of offshore equipment, the inner walls of water reservoirs (such as ballast tanks of ships), and the surface of filtration systems in desalination equipment. Furthermore, according to one aspect of the invention, the maritime structure is stationary. In stationary maritime structures, biofouling does not pose a problem by itself, but as explained above, corrosion is still found despite ICCP. However, the system can also be applied to non-stationary maritime structures such as ships. Still further in accordance with an aspect of the present invention, a support for a sea-based wind turbine can include a guide element configured to cooperate with a corresponding element on a float carrying one of the light-emitting configurations. Further, a float can be used to move only one or more light sources or mirrors via a mechanical coupling based on the liquid level to direct anti-fouling light toward the liquid line or a tidal or splash zone. In summary, a system protects a protected surface from a maritime structure that is in contact with a liquid containing one of the biofouling organisms. The protected surface is electrically conductive and protected from corrosion by impressed current cathodic protection (ICCP). The system has a lighting configuration that includes a light source for emitting anti-fouling light. The illumination configuration is configured to emit the anti-fouling light from the light source toward an area of the protected surface. In fact, when the marine structure is partially immersed in the fouling liquid, biofouling is prevented and the operation of the ICCP is improved. Aspects of the invention include: 1. A system for enhancing corrosion protection of a protected surface (30) of a marine structure (110) in contact with a liquid containing one of the biofouling organisms, the protected surface being electrically conductive And resisting corrosion by impressed current cathodic protection (ICCP), the system comprising a lighting arrangement (100) comprising a light source (20) for emitting anti-fouling light (22), the lighting configuration being configured The anti-fouling light is emitted from the light source toward a region of the protected surface (30). 2. The system of aspect 1, wherein the region comprises a tidal portion or a splash portion positioned at a level of the liquid when the marine structure portion is submerged in the liquid. 3. The system of aspect 1 or 2, wherein the region comprises an immersed portion positioned at the liquid level of the liquid when the marine structure portion is submerged in the liquid. 4. The system of any of aspects 1 to 3, wherein the illuminating configuration comprises a float (50) for positioning the illuminating configuration at the region. 5. The system of any of the preceding aspects, wherein the illumination configuration (100) is shaped to be movably mounted within an interior space (115) of the marine structure from which the protected surface is At least a portion of the inner surface of the wall is formed. 6. A system according to any of the preceding aspects, wherein the system comprises a distance holder (40) for maintaining the light source at a predetermined distance from the area at the area Providing at least a predetermined intensity of the anti-fouling light. 7. The system of aspect 6, wherein the distance holder (40) includes a guiding element to be coupled to the maritime structure, the guiding element configured to maintain the illuminating configuration a predetermined distance from the area, and the liquid The height of the liquid level has changed. 8. The system of any of the preceding aspects, wherein the light source comprises at least one first light unit (25), the at least one first light unit (25) being disposed at an angle to the liquid at an angle At least a portion (23) of the anti-fouling light is emitted toward the surface of the liquid such that the portion of the anti-fouling light reaches an immersed portion of the region. 9. The system of any of the preceding aspects, wherein the light source comprises an LED foil disposed at an outer boundary of one of the illumination configurations, the LED foil (28) comprising an optical medium and embedded in the optical medium At least one LED light unit (29) that emits the anti-fouling light is directed toward the area, the optical medium allowing at least a portion of the anti-fouling light to propagate through the optical medium. 10. A system according to any of the preceding aspects, wherein the light source comprises at least one second light unit (27) configured to be submerged in the liquid at the maritime structure portion The medium unit is immersed in the liquid level of the liquid, and the light unit is configured to emit at least a portion of the anti-fouling light toward one of the immersed portions (36) of the region. 11. The system of any of the preceding aspects, wherein the system comprises a control unit (61) for determining a distance between the light source and the region, optical power of the light source And/or absorption of the anti-fouling light by the liquid. 12. The system of any of the preceding aspects, wherein the illumination configuration is configured to move the light source relative to the region in a direction parallel to the surface of the liquid and/or perpendicular to one of the surfaces of the liquid . 13. A system according to any of the preceding aspects, wherein the system comprises an impressed current unit for providing the protected surface with the impressed current cathodic protection (ICCP). 14. A maritime structure having a protected surface (30), in particular a support structure for a sea-based wind turbine, the protected surface (30) being configured to conduct electricity to one of the organisms containing biofouling The liquid contact is protected against corrosion by impressed current cathodic protection (ICCP), the maritime structure comprising: a system (100, 102, 103, 104, 105) according to any of the foregoing aspects, wherein the illumination configuration is configured Anti-fouling light is emitted toward this area facing the protected surface (30). 15. A maritime structure having a protected surface (30), in particular a support structure for a sea-based wind turbine, the protected surface (30) being configured to conduct electricity to one of the organisms containing biofouling The liquid contact is protected against corrosion by impressed current cathodic protection (ICCP), the maritime structure comprising: a first guiding element configured to be second guided on one of the distance holders as described in aspect 7 Component collaboration. 16. A method of enhancing corrosion protection of a protected surface (30) of a marine structure (110) in contact with a liquid containing one of the biofouling organisms, the protected surface being electrically conductive, the method comprising protecting the protected surface The surface (30) provides impressed current cathodic protection (ICCP) and powers a source to emit anti-fouling light toward an area of the protected surface.

20‧‧‧Light source/lighting configuration

22‧‧‧Anti-fouling

23‧‧‧At least part of the anti-fouling light

25‧‧‧First light unit/lighting configuration

27‧‧‧Second light unit

28‧‧‧LED foil

29‧‧‧LED light unit

30‧‧‧protected surface

31‧‧‧Liquid line

35‧‧‧ tide section

36‧‧‧Immersion section/area

36’‧‧‧ Immersion section

37‧‧‧Parts

37’‧‧‧ Section

40‧‧‧ distance holder

41‧‧‧ distance holder

42‧‧‧Center sea cable

43‧‧‧Diagonal cable

44‧‧‧ platform

50‧‧‧Float

51‧‧‧Float

52‧‧‧Float

61‧‧‧Control unit

100‧‧‧Lighting configuration/system

102‧‧‧System/Lighting Configuration

103‧‧‧System/Lighting Configuration

104‧‧‧System/Lighting Configuration/Device

105‧‧‧System/Lighting Configuration

110‧‧‧Maritime structure

112‧‧‧Anode

115‧‧‧Internal space

120‧‧‧Liquid

130‧‧‧ soil

This and other aspects of the present invention will be apparent from and elucidated with reference to the accompanying drawings. An example of a system, Figure 2 shows a further example of a system for improving corrosion protection of a protected surface, Figure 3 shows an example of a lighting configuration with one raised light unit, and Figure 4 shows an example with immersion light A further example of one of the unit illumination configurations, and FIG. 5 shows a further example of one of the illumination configurations with one LED foil. The drawings are only schematic and are not drawn to scale. In the figures, elements corresponding to the described elements may have the same element symbols.

Claims (15)

A system for enhancing corrosion protection of a protected surface (30) of a marine structure (110) in contact with a liquid containing one of the biofouling organisms, the protected surface being electrically conductive and having an applied current cathode Protection (ICCP) to prevent corrosion, the system comprising a lighting arrangement (100) comprising a light source (20) for emitting anti-fouling light (22), the lighting arrangement being configured to be protected from the light source towards the source An area of the surface (30) emits the anti-fouling light. The system of claim 1, wherein the system is configured to emit the anti-fouling light toward the area during use, wherein the area comprises at least one of: a tidal portion or a splash portion in the marine structure portion When immersed in the liquid, it is positioned at the liquid level of the liquid; an immersed portion is positioned at the liquid level of the liquid when the maritime structural portion is immersed in the liquid. A system of claim 1 or 2, wherein the illumination configuration comprises a float (50) for positioning the illumination configuration at the region. The system of claim 1 or 2, wherein the illumination configuration (100) is shaped to be movably mounted within an interior space (115) of the marine structure, the protected surface being the inner surface of the wall of the interior space At least part of it is formed. The system of claim 1 or 2, wherein the system includes a distance holder (40) for maintaining the light source at a predetermined distance from the area to provide the anti-fouling at the area At least a predetermined intensity of light. The system of claim 5, wherein the distance holder (40) includes a guiding element to be coupled to the maritime structure, the guiding element configured to maintain the illuminating configuration while the height of the liquid level of the liquid changes The area is separated by a predetermined distance. The system of claim 1 or 2, wherein the light source comprises at least one first light unit (25) disposed at a distance from the liquid at an angle toward the surface of the liquid At least a portion (23) of the anti-fouling light is emitted such that the portion of the anti-fouling light reaches an immersed portion of the region. The system of claim 1 or 2, wherein the light source comprises an LED foil disposed at an outer boundary of one of the illumination configurations, the LED foil (28) comprising an optical medium and embedded in the optical medium to emit toward the area The at least one LED light unit (29) of the anti-fouling light, the optical medium allowing at least a portion of the anti-fouling light to propagate through the optical medium. The system of claim 1 or 2, wherein the light source comprises at least one second light unit (27) configured to immerse the liquid when the marine structure portion is submerged in the liquid At the liquid level, the light unit is configured to emit at least a portion of the anti-fouling light toward one of the immersed portions (36) of the region. The system of claim 1 or 2, wherein the system comprises a control unit (61) for determining a distance between the light source and the area, optical power of the light source, and/or The absorption of the anti-fouling light by the liquid. A system of claim 1 or 2, wherein the illumination configuration is configured to move the light source relative to the region in a direction parallel to the surface of the liquid and/or perpendicular to one of the surfaces of the liquid. The system of claim 1 or 2, wherein the system includes an applied current unit for providing the applied surface with the applied current cathodic protection (ICCP). A maritime structure having a protected surface (30), in particular a support structure for a sea-based wind turbine, the protected surface (30) being configured to conduct electricity to be in contact with a liquid containing a biofouling organism In contact, the anti-corrosion is provided by impressed current cathodic protection (ICCP), the maritime structure comprising the system (100, 102, 103, 104, 105) of any one of claims 1 to 12, wherein the illumination configuration is configured Anti-fouling light is emitted toward this area facing the protected surface (30). A maritime structure having a protected surface (30), in particular a support structure for a sea-based wind turbine, the protected surface (30) being configured to conduct electricity to be in contact with a liquid containing a biofouling organism In contact, the corrosion is prevented by impressed current cathodic protection (ICCP) configured to receive the system of any one of claims 1 to 12. A method of enhancing corrosion protection of a protected surface (30) of a marine structure (110) in contact with a liquid containing one of the biofouling organisms, the protected surface being electrically conductive, the method comprising the protected surface ( 30) providing impressed current cathodic protection (ICCP) and powering a light source to emit anti-fouling light toward an area of the protected surface.