Anti-corrosion construction process for offshore wind power foundation

Abstract

The invention discloses an anti-corrosion construction process for an offshore wind power foundation, and belongs to the technical field of offshore wind power. Then preparing an anti-corrosion material; carrying out anti-corrosion process construction; later maintenance and regular inspection; the anticorrosion process construction specifically comprises a physical barrier process, a chemical protection process and an electrochemical protection process; multiple anti-corrosion measures are adopted, the corrosion resistance of the foundation structure is comprehensively improved, high-performance anti-corrosion materials and an advanced construction technology are selected, the anti-corrosion effect is ensured, meanwhile, the construction efficiency and quality are improved, the method can be suitable for different types of offshore wind power foundation structures, and the construction cost is reduced. The service life of the offshore wind power foundation structure can be effectively prolonged, the maintenance and replacement frequency and cost are reduced, meanwhile, the good environment-friendly performance is achieved, and emission of waste and pollutants generated due to corrosion can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power, and in particular relates to an offshore wind power foundation anti-corrosion construction process. Background Art

[0002] As the global demand for renewable energy continues to grow, offshore wind power has received widespread attention as an efficient and clean energy form. Offshore wind power has the characteristics of abundant resources, high power generation utilization hours, no land occupation and suitability for large-scale development. It is the latest frontier of global wind power development. The current various offshore wind power foundation structures include single pile foundation, tripod foundation and multi-pile foundation. These foundation structures have been subjected to erosion by natural factors such as waves, tides and salt spray in the marine environment for a long time. The offshore wind power foundation structure is exposed to the harsh marine environment for a long time and is easily affected by corrosion, which shortens its service life.

[0003] Therefore, developing an anti-corrosion construction process for offshore wind power foundations has important practical significance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an offshore wind power foundation anti-corrosion construction process in view of the deficiencies in the above-mentioned prior art, so as to solve the technical problem that the offshore wind power foundation structure is easily corroded and has a shortened service life in the marine environment.

[0005] The present invention adopts the following technical solutions: An offshore wind power foundation anti-corrosion construction process comprises the following steps: Surface treatment of offshore wind power infrastructure; Based on the anti-corrosion technology, anti-corrosion materials are used to treat the offshore wind power foundation structure, isolating the corrosive media in the marine environment from contacting the foundation structure, forming a protective film on the surface of the foundation structure, and preventing electrochemical corrosion of the offshore wind power foundation structure through external current or sacrificial anode.

[0006] Preferably, the surface treatment of the offshore wind power foundation structure specifically includes: Foundation surface cleaning treatment, foundation surface rust removal treatment and foundation surface oil treatment.

[0007] More preferably, the surface of the foundation is cleaned by using cleaning equipment to remove dust and impurities on the surface of the offshore wind power foundation; Rust removal treatment on the foundation surface: Use rust removal equipment and grinding equipment to grind the surface of the offshore wind power foundation to ensure that the foundation surface is flat; Oil stain treatment on the foundation surface: apply degreasing agent on the surface of the offshore wind power foundation structure, and then use cleaning equipment to clean the foundation surface.

[0008] Preferably, the anti-corrosion material comprises an anti-corrosion coating, a corrosion-resistant chemical material and / or an impressed current device.

[0009] Preferably, the anti-corrosion process construction specifically includes: physical barrier process, chemical protection process and electrochemical protection process.

[0010] More preferably, the physical barrier process is specifically: By applying anti-corrosion coatings and wrapping anti-corrosion materials, the corrosive media in the marine environment are isolated from contact with the foundation structure.

[0011] More preferably, the chemical protection process is specifically: The corrosion-resistant chemical material is evenly sprayed on the surface of the base structure by uniform spraying, ensuring that the corrosion-resistant chemical material is evenly and densely covered on the base structure, thereby forming a protective film on the surface of the base structure.

[0012] More preferably, the electrochemical protection process is specifically: An impressed current device is added to the outside of the basic structure, and a sacrificial anode of the impressed current device is used to prevent electrochemical corrosion of the basic structure.

[0013] Preferably, after the offshore wind power infrastructure is treated with anti-corrosion materials, a regular inspection cycle is set to inspect the offshore wind power infrastructure during the regular inspection cycle.

[0014] Preferably, the offshore wind power foundation structure includes a monopile foundation, a tripod foundation and a multi-pile foundation.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: An offshore wind power foundation anti-corrosion construction process adopts multiple anti-corrosion measures to comprehensively improve the corrosion resistance of the foundation structure. Secondly, high-performance anti-corrosion materials and advanced construction techniques are selected to ensure the anti-corrosion effect while improving construction efficiency and quality. Finally, the anti-corrosion technology of the present invention has a wide range of applications and can be applied to different types of offshore wind power foundation structures.

[0016] The present invention adopts multiple anti-corrosion measures, including physical barriers, chemical protection and electrochemical protection. The physical barrier isolates the corrosive medium in the marine environment from contact with the basic structure by applying anti-corrosion coatings and wrapping anti-corrosion materials. The chemical protection forms a protective film on the surface of the basic structure by using corrosion-resistant chemical materials to resist the erosion of the corrosive medium. The electrochemical protection prevents the electrochemical corrosion of the basic structure by means of external current or sacrificial anode.

[0017] The present invention can effectively extend the service life of offshore wind power infrastructure, reduce the frequency and cost of maintenance and replacement, and also has good environmental performance, which can reduce the emission of waste and pollutants caused by corrosion. The expected benefits include improving the economic, environmental and social benefits of offshore wind power projects, and promoting the sustainable development of the offshore wind power industry.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the construction process of the present invention; Figure 2 Schematic diagram of local current density of steel pipe piles in seawater area, where (a) is 20a and (b) is 25a. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the present invention, unless otherwise specified, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0022] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0023] In the present invention, unless otherwise specified, percentage (%) or part refers to the weight percentage or weight part relative to the composition.

[0024] In the present invention, unless otherwise specified, the components or preferred components involved can be combined with each other to form a new technical solution.

[0025] In the present invention, unless otherwise specified, the numerical range "a-b" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed in this document, and "6-22" is just an abbreviation of these numerical combinations.

[0026] The “range” disclosed in the present invention is in the form of a lower limit and an upper limit, which can be one or more lower limits, and one or more upper limits, respectively.

[0027] In the present invention, the term "and / or" used herein refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in accordance with the sequence. Preferably, the reaction method herein is carried out sequentially.

[0029] Unless otherwise specified, the professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the described content may also be applied to the present invention.

[0030] The present invention provides an offshore wind power foundation anti-corrosion construction process. By adopting advanced anti-corrosion materials and construction processes, the corrosion resistance of the offshore wind power foundation structure is enhanced and the service life of the structure is improved. The particularity of the marine environment and the special requirements of the offshore wind power foundation structure are comprehensively considered. While ensuring the anti-corrosion effect, the operability and cost-effectiveness of the construction are also considered. The anti-corrosion technology of the present invention has a wide range of applications and can be applied to different types of offshore wind power foundation structures.

[0031] See also Figure 1 The present invention provides an offshore wind power foundation anti-corrosion construction process, comprising the following steps: S1. Surface treatment of foundation structure; The surface treatment of offshore wind power foundation structures specifically includes: Clean the surface of the foundation and use cleaning equipment to remove dust and impurities on the surface of the foundation; Rust removal treatment on the foundation surface: use rust removal equipment and grinding equipment to grind the foundation surface to ensure that the foundation surface is flat; To treat the oil stains on the foundation surface, apply a degreasing agent on the surface of the foundation structure and then use cleaning equipment to clean the foundation surface.

[0032] By adopting the above technical solution, the surface of the foundation structure is cleaned and rust-removed to ensure that the surface is smooth and free of oil stains and rust.

[0033] The foundation structures in foundation structure surface treatment include single pile foundation, tripod foundation and multi-pile foundation.

[0034] By adopting the above technical solution, the present invention can be applied to different types of offshore wind power infrastructure.

[0035] S2. Preparation of anti-corrosion materials; The preparation of anti-corrosion materials specifically includes: preparing anti-corrosion coatings, anti-corrosion materials, corrosion-resistant chemical materials, and impressed current equipment. The anti-corrosion coatings and anti-corrosion materials are used to isolate the corrosive media in the marine environment from contact with the foundation structure. The corrosion-resistant chemical materials are used to form a protective film on the surface of the foundation structure to resist the erosion of the corrosive media. The impressed current equipment is used to apply current sacrificial anodes to prevent electrochemical corrosion of the foundation structure.

[0036] By adopting the above technical solution and preparing a variety of anti-corrosion materials, suitable anti-corrosion materials and construction techniques can be selected according to a predetermined anti-corrosion plan.

[0037] S3, anti-corrosion process construction; The anti-corrosion process construction specifically includes: physical barrier process, chemical protection process and electrochemical protection process.

[0038] Physical barrier technology, by applying anti-corrosion coatings and wrapping anti-corrosion materials, isolates the corrosive media in the marine environment from contact with the foundation structure; Chemical protection process, by uniformly spraying, the corrosion-resistant chemical material is evenly sprayed on the surface of the base structure to ensure that the corrosion-resistant chemical material is evenly and densely covered on the base structure, thereby forming a protective film on the surface of the base structure; The electrochemical protection process uses an impressed current device to be added to the outside of the infrastructure and uses the sacrificial anode of the impressed current device to prevent electrochemical corrosion of the infrastructure.

[0039] By adopting the above technical solution, high-performance anti-corrosion materials are selected, such as polymer composite materials, corrosion-resistant metals and special coatings. These materials have good corrosion resistance, aging resistance and environmental protection performance, and can adapt to the special requirements of the marine environment.

[0040] The anti-corrosion construction process must ensure that the coating is uniform, free of bubbles and missing coating, so as to form an effective anti-corrosion barrier.

[0041] The above technical scheme adopts multiple anti-corrosion measures, including physical barriers, chemical protection and electrochemical protection. The physical barrier isolates the corrosive media in the marine environment from contact with the foundation structure by applying anti-corrosion coatings and wrapping anti-corrosion materials. The chemical protection forms a protective film on the surface of the foundation structure through the use of corrosion-resistant chemical materials to resist the erosion of corrosive media. The electrochemical protection prevents electrochemical corrosion of the foundation structure through the use of external current or sacrificial anodes.

[0042] S4. Post-maintenance and regular inspection.

[0043] Post-maintenance and regular inspections specifically include: setting up regular inspection cycles, inspecting the infrastructure that has undergone anti-corrosion construction during the regular inspection cycles, promptly discovering and dealing with possible damage and aging problems with the anti-corrosion coating, and when there are problems with damage and aging of the anti-corrosion coating, promptly spraying new anti-corrosion coatings or replacing new anti-corrosion coatings to ensure the long-term effectiveness of the anti-corrosion process.

[0044] By adopting the above technical solution, through regular inspection and maintenance, possible damage and aging problems of the anti-corrosion coating can be discovered and dealt with in time, ensuring the anti-corrosion effect.

[0045] It can effectively extend the service life of offshore wind power infrastructure, reduce the frequency and cost of maintenance and replacement, and also has good environmental performance, which can reduce the emission of waste and pollutants caused by corrosion. The expected benefits include improving the economic, environmental and social benefits of offshore wind power projects, and promoting the sustainable development of the offshore wind power industry.

[0046] The offshore wind power steel pipe piles are protected by a combined protection method of sacrificial anode and graphene coating. The sacrificial anode is Al-Zn-In-Mg-Ti alloy, which is welded on the ring beam of the integrated cage structure. After the pile is sunk, the sacrificial anode is hoisted on the steel pipe pile along with the integrated cage structure, and part of the sacrificial anode sinks into the mud area.

[0047] Electrochemical tests show that as the coating thickness increases, the exchange current density of the coating decreases, its electrochemical activity decreases, and the coating's ability to resist electrolyte corrosion increases, thereby slowing down the corrosion process of the metal substrate. The coating insulates the surface of the steel structure and reduces the area of ​​cathodic protection. However, reducing the cathodic protection area is difficult to achieve in numerical simulations. The method of reducing the exchange current density can be used to reflect the protective effect of the coating in the numerical model.

[0048] (1) Basic settings To save calculation time, a quarter cylinder is taken as the calculation domain according to symmetry. The cylinder radius is 60 m, the height is 100 m, the steel pipe pile is 64 m long, the thickness is 70 mm, and the outer diameter is 2.75 m. Offshore wind power steel pipe piles pass through the atmospheric zone, splash zone, tidal zone, full immersion zone and sea mud zone. The direct simulation of the interaction between the gas, liquid, solid and steel pipe piles in different zones is costly and difficult, which is not convenient for engineering application. Therefore, the simulation of these zones can be achieved by setting different exchange current densities. To simplify the calculation process, the medium interacting with the steel pipe pile is divided into three parts: the upper part is the atmospheric zone, 8.8 m high, the middle part is the seawater zone, 10 m high, and the lower part is the sea mud zone, 81.2 m high. The seawater zone is the graphene coating zone. Six groups of sacrificial anodes are set at equal intervals around the steel pipe piles. The sacrificial anode is 2 m long, with an initial radius of 0.23 m and a final radius of 0.05 m. It is modeled using the "Sacrificial Edge Anode" node, and the electrode kinetic model adopts the linear Butler-Volmer model. As the anode dissolves, the radius of the anode decreases, and when the final radius is reached, the anode is cut off.

[0049] (2) Analysis of the combined protective effect of graphene coating and sacrificial anode See also Figure 2 , showing the graphene coating and the conventional coating (i0=4×10 -5 A / m 2 ) is the local current density on the surface of the steel pipe pile under the action of the graphene coating, that is, the corrosion rate; at the 20th year, the sacrificial anode is not completely consumed. As an alloy material with a lower potential, the sacrificial anode makes the steel pipe pile a cathode material. The potential difference between the sacrificial anode and the steel pipe pile produces a current of a certain intensity, which protects the steel pipe pile. The local current density of the steel pipe pile is at a low level. At the 25th year, the sacrificial anode has been completely consumed, and the corrosion rate of the steel pipe pile has increased significantly compared with the corrosion rate at the 20th year. For example, at sea level, the corrosion rate of the steel pipe pile has increased by two orders of magnitude for both the graphene coating and the conventional coating. In addition, due to Figure 2 It can be seen that the corrosion rate at the mud surface is slower. The use of graphene coating can significantly reduce the corrosion rate of steel pipe piles; at 20 years, the corrosion rates of steel pipe piles at sea level under the protection of graphene coating and conventional coating are 2.13×10 -2 A / m 2 and 5.75×10 -2 A / m 2 , at 25 a, they are 0.214 A / m 2 and 0.352 A / m 2It can be seen that at 20 a and 25 a, the corrosion rate under the protection of graphene coating is 37% and 61% of that under the protection of conventional coating, which reflects the important role of the combined protection of graphene coating and sacrificial anode.

[0050] (3) Conclusion 1) The adhesion of graphene coating is significantly greater than that of conventional coating, and its average adhesion is increased by nearly 20%. The corrosion current of graphene coating is one order of magnitude lower than that of conventional coating, and its corrosion potential also gradually shifts positively, indicating that the anti-corrosion effect of graphene coating is better.

[0051] 2) Compared with conventional coatings, the use of graphene coatings can significantly reduce the corrosion rate of the steel pipe pile surface. At 20 and 25 years, the corrosion rate of the steel pipe piles protected by graphene coatings at sea level is 37% and 61% of that of conventional coatings.

[0052] In summary, the present invention provides an offshore wind power foundation anti-corrosion construction process, which adopts physical barriers, chemical protection and electrochemical protection. The physical barrier isolates the corrosive medium in the marine environment from contact with the foundation structure by applying anti-corrosion coatings and wrapping anti-corrosion materials. The chemical protection forms a protective film on the surface of the foundation structure by using corrosion-resistant chemical materials to resist the erosion of the corrosive medium. The electrochemical protection prevents the electrochemical corrosion of the foundation structure by using an external current or a sacrificial anode. Multiple anti-corrosion measures are adopted to comprehensively improve the corrosion resistance of the foundation structure. Secondly, high-performance anti-corrosion materials and advanced construction techniques are selected to ensure the anti-corrosion effect while improving the construction efficiency and quality. At the same time, it also has good environmental protection performance, which can reduce the emission of waste and pollutants caused by corrosion. The expected benefits include improving the economic benefits, environmental benefits and social benefits of offshore wind power projects, and promoting the sustainable development of the offshore wind power industry.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An offshore wind power foundation anti-corrosion construction process, characterized in that: The following steps are involved: Surface treatment of offshore wind power infrastructure; Based on the anti-corrosion technology, anti-corrosion materials are used to treat the offshore wind power foundation structure, isolating the corrosive media in the marine environment from contacting the foundation structure, forming a protective film on the surface of the foundation structure, and preventing electrochemical corrosion of the offshore wind power foundation structure through external current or sacrificial anode.

2. The offshore wind power foundation anti-corrosion construction process according to claim 1 is characterized in that: The surface treatment of offshore wind power foundation structures specifically includes: Foundation surface cleaning treatment, foundation surface rust removal treatment and foundation surface oil treatment.

3. The offshore wind power foundation anti-corrosion construction process according to claim 2 is characterized in that: Foundation surface cleaning treatment, using cleaning equipment to remove dust and impurities on the surface of offshore wind power foundations; Rust removal treatment on the foundation surface: Use rust removal equipment and grinding equipment to grind the surface of the offshore wind power foundation to ensure that the foundation surface is flat; Oil stain treatment on the foundation surface: apply degreasing agent on the surface of the offshore wind power foundation structure, and then use cleaning equipment to clean the foundation surface.

4. The offshore wind power foundation anti-corrosion construction process according to claim 1 is characterized in that: Anti-corrosion materials include anti-corrosion coatings, corrosion-resistant chemical materials and / or impressed current devices.

5. The offshore wind power foundation anti-corrosion construction process according to claim 1 is characterized in that: The anti-corrosion process construction specifically includes: physical barrier process, chemical protection process and electrochemical protection process.

6. The offshore wind power foundation anti-corrosion construction process according to claim 5 is characterized in that: The physical barrier process is as follows: By applying anti-corrosion coatings and wrapping anti-corrosion materials, the corrosive media in the marine environment are isolated from contact with the foundation structure.

7. The offshore wind power foundation anti-corrosion construction process according to claim 5 is characterized in that: The specific chemical protection process is: The corrosion-resistant chemical material is evenly sprayed on the surface of the base structure by uniform spraying, ensuring that the corrosion-resistant chemical material is evenly and densely covered on the base structure, thereby forming a protective film on the surface of the base structure.

8. The offshore wind power foundation anti-corrosion construction process according to claim 5 is characterized in that: The specific electrochemical protection process is: An impressed current device is added to the outside of the basic structure, and a sacrificial anode of the impressed current device is used to prevent electrochemical corrosion of the basic structure.

9. The offshore wind power foundation anti-corrosion construction process according to claim 1 is characterized in that: After the offshore wind power foundation structure is treated with anti-corrosion materials, a regular inspection cycle is set up to inspect the offshore wind power foundation structure during the regular inspection cycle.

10. The offshore wind power foundation anti-corrosion construction process according to any one of claims 1 to 9, characterized in that: Offshore wind power foundation structures include single pile foundation, tripod foundation and multi-pile foundation.

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