Method and device for controlling corrosion of inner wall of offshore wind power steel pile

Abstract

The invention relates to the technical field of ocean engineering corrosion protection, in particular to an offshore wind power steel pile inner wall corrosion control method and device. The device comprises a material bag string, one end of the material bag string is connected with the top of the steel pile, the other end of the material bag string penetrates into seawater in the steel pile, the bottom of the material bag is in a pocket shape, the upper portion of the material bag is cylindrical, and a plurality of water permeable holes are formed in the periphery of the material bag. And a compound preservative is placed in the material bag. The invention aims to provide comprehensive corrosion protection for the inner wall of the offshore wind power steel pile and realize reliable corrosion control on the inner wall of the steel pile. According to the design of the method, a method of suspending a soluble compound preservative material bag in seawater is adopted, the feeding quantity and position are determined through calculation, the concentration of a corrosion inhibitor and a bactericide in the seawater reaches an effective concentration range by utilizing self-dissolution and diffusion of a preservative, and the purpose of long-acting safe corrosion prevention is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering corrosion protection, and in particular to a method and device for controlling the inner wall corrosion of offshore wind power steel piles. Background Art

[0002] When cathodic protection is used for corrosion protection of the inner wall of offshore wind power steel piles, both impressed current protection and sacrificial anode protection have good protection effects against the erosion of seawater, but the protection effect on the microbial corrosion that is common inside the steel piles is relatively limited, and it is difficult to solve the severe microbial corrosion problem inside the steel piles; and when cathodic protection is performed, cathodic hydrogen may also be produced on the surface of the steel piles, and hydrogen accumulates at the top of the steel piles. If it cannot be safely discharged, it is easy to cause safety risks. In addition, when impressed current cathodic protection is used, energy needs to be consumed continuously, and the cost of a single cathodic protection system is high; when sacrificial anode protection is used, the required anode weight is large, and usually a single steel pile requires hundreds of kilograms or even tons of anodes. There are certain risks in hanging it under the cabin, and it is difficult to install and replace. Therefore, it is necessary to develop a more effective, safe and low-cost method for corrosion protection of the inner wall of steel piles to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method and device for controlling the inner wall corrosion of offshore wind power steel piles. The present invention provides the following technical solutions:

[0004] A device for controlling the inner wall corrosion of offshore wind power steel piles, the device comprising a material bag string, wherein:

[0005] One end of the material bag string is connected to the top of the steel pile, and the other end is inserted into the seawater inside the steel pile.

[0006] The bottom of the material bag is in a pocket shape, the upper part is in a cylindrical shape, and a plurality of water-permeable holes are arranged around it; a composite preservative is placed in the material bag.

[0007] Furthermore, the material bag is tied to the cable at a predetermined distance, wherein the predetermined distance includes the distance between the material bag near the bottom of the steel pile and the bottom of the steel pile, the distance between the material bag near the sea water surface and the water surface, and the distance between the material bags.

[0008] Furthermore, the distance between the material bag near the bottom of the steel pile and the bottom of the steel pile is less than or equal to half of the inner diameter of the steel pile and greater than 0;

[0009] The distance between the material bag close to the seawater surface and the water surface is less than or equal to the inner diameter of the steel pile and greater than 0;

[0010] The material bags are placed at equal intervals, and the distance between them is 1 to 2 times the inner diameter of the steel pile.

[0011] Furthermore, the composite preservative in the material bag is in block shape.

[0012] Furthermore, the composite preservative comprises a corrosion inhibitor and a bactericide.

[0013] Furthermore, the ratio of the corrosion inhibitor to the fungicide in the composite preservative is 0.1:1 to 1:1.

[0014] Furthermore, the concentration of the corrosion inhibitor in the composite preservative is 100-1000 ppm, and the concentration of the fungicide is 1-10 ppm.

[0015] Furthermore, the corrosion inhibitor includes an inorganic salt corrosion inhibitor, an organic corrosion inhibitor or a composite corrosion inhibitor, wherein:

[0016] The inorganic salt corrosion inhibitor includes tungstate, antimonate, molybdate, borate, nitrite, nitrate or modified silicate;

[0017] Organic corrosion inhibitors include chain organic amines and their derivatives, imidazoline and its derivatives, quaternary ammonium salts or rosin amine derivatives.

[0018] Furthermore, the fungicide is selected from one of chloride fungicides, organic amine fungicides, organic bromide fungicides, organic acid fungicides, quaternary phosphate fungicides and composite fungicides.

[0019] A method for controlling the inner wall corrosion of offshore wind power steel piles is also provided. The method adopts the above-mentioned device and comprises the following steps:

[0020] Calculate the volume of water inside the steel pile based on the inner diameter of the steel pile and the immersion depth;

[0021] Determine the type of composite antiseptic according to the material of the steel pile and the environmental characteristics, wherein the composite antiseptic includes a corrosion inhibitor and a fungicide;

[0022] Determine the amount of composite preservative according to the volume of water in the steel pile and the type of composite preservative;

[0023] The determined amount of composite preservative is evenly divided and put into multiple material bags;

[0024] A plurality of material bags containing the composite preservative are placed in the seawater inside the steel pile at a predetermined distance.

[0025] Furthermore, a plurality of material bags containing the composite preservative are placed in the seawater inside the steel pile at a predetermined distance, including:

[0026] tying a plurality of material bags containing composite preservatives to the cable at predetermined distances;

[0027] One end of the cable with multiple material bags is connected to the top of the steel pile, and the other end is inserted into the sea water inside the steel pile.

[0028] Furthermore, the consumption of the composite preservative material package is checked regularly, and the composite preservative is replenished according to the consumption.

[0029] Further, checking the consumption of the composite preservative material package includes the following steps:

[0030] During inspection, the entire string of material bags is lifted from the top to check whether the remaining amount of the composite preservative in each material bag and the concentration of the composite preservative dissolved in seawater meet the anti-corrosion threshold.

[0031] Furthermore, when the remaining amount of the composite preservative in the material bag and the concentration of the composite preservative dissolved in the seawater meet the anti-corrosion threshold, the composite preservative in the material bag is not replaced;

[0032] When the remaining amount of the composite preservative in the material bag and the concentration of the composite preservative dissolved in seawater do not meet the anti-corrosion threshold, the composite preservative in the material bag is replaced.

[0033] Also provided is the use of the above-mentioned offshore wind power steel pile inner wall corrosion control device in the offshore wind power steel pile inner wall corrosion protection, wherein the offshore wind power steel pile inner wall corrosion protection includes preventing seawater corrosion and preventing microbial corrosion.

[0034] Technical effects and advantages of the present invention:

[0035] The purpose of the present invention is to provide comprehensive corrosion protection for the inner wall of offshore wind power steel piles and realize reliable corrosion control of the inner wall of steel piles. The method is designed to adopt the method of suspending soluble composite preservative material bags in seawater, and the quantity and position of the injection are determined by calculation, and the self-dissolution and diffusion of the preservative are used to make the concentration of the corrosion inhibitor and bactericide in the seawater reach the effective concentration range, so as to achieve the purpose of long-term and safe corrosion protection.

[0036] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the inner wall corrosion control of steel piles provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0039] In order to address the deficiencies of the prior art, the present invention discloses a method for controlling the corrosion of the inner wall of offshore wind power steel piles. Starting from the perspective of synchronous control of seawater corrosion and microbial corrosion on the inner wall of the steel pile, based on the characteristics of the limited fixed water volume in the steel pile, and based on a water-soluble composite preservative compounded with corrosion-inhibiting components and bactericidal components, the self-dissolution and diffusion behavior of the composite preservative, as well as the method of addition are studied. The dosage of the composite preservative is calculated according to the specifications of the steel pile and the volume of the water body. According to the law of free diffusion of the preservative in the water body, a distributed addition method is designed to suspend the composite preservative material bag at a suitable position in the seawater in the steel pile. The composite preservative maintains an appropriate concentration in the seawater in the steel pile through dissolution and diffusion, which is used to simultaneously prevent the steel pile from seawater corrosion and microbial corrosion. In this way, corrosion control of the inner wall of the steel pile is achieved. The method comprises the following steps,

[0040] Step 1: Calculate the volume of water inside the steel pile based on the inner diameter of the steel pile and the immersion depth;

[0041] Step 2: Determine the type of composite preservative according to the material of the steel pile and the environmental characteristics, thereby determining the effective concentration range of the preservative, wherein the composite preservative includes a corrosion inhibitor and a fungicide; usually the dosing concentration of the corrosion inhibitor is c 1 At 100~1000ppm, the concentration of fungicide is c 2 It is 1 to 10ppm; for different temperatures and sea areas, the steel needs to be specifically selected, and each wind farm is not exactly the same.

[0042] In a specific embodiment of the present invention, since there are many types of corrosion inhibitors and fungicides on the market, each product has a recommended effective concentration range, and the embodiment of the present invention can be used according to the product technical specifications.

[0043] In a specific embodiment of the present invention, the corrosion inhibitor includes an inorganic salt corrosion inhibitor, an organic corrosion inhibitor or a composite corrosion inhibitor.

[0044] The inorganic salt corrosion inhibitors include tungstates, antimonates, molybdates, borates, nitrites, nitrates or modified silicates; the organic corrosion inhibitors include chain organic amines and their derivatives, imidazolines and their derivatives, quaternary ammonium salts or rosin amine derivatives.

[0045] The fungicide is selected from the group consisting of chloride fungicides, organic amine fungicides, organic bromide fungicides, organic acid fungicides, quaternary phosphate fungicides and composite fungicides.

[0046] Step 3: Determine the dosage of the composite preservative according to the volume of water in the steel pile and the type of composite preservative. The specific operation is as follows: Calculate the required mass of corrosion inhibitor m1 and mass of fungicide m2 based on the volume of water, and compound the two to form a composite preservative.

[0047] Step 4: Divide the determined amount of composite preservatives evenly into multiple material bags. The specific steps are as follows:

[0048] The screened corrosion inhibitors and fungicides are mixed evenly in a certain proportion, and then pressed into powder to form a block-shaped composite preservative. The block-shaped composite preservative is placed in a material bag, which is made of non-metallic materials or corrosion-resistant metals. The bottom is in a pocket shape, carrying the composite preservative, and the upper part is in a cylindrical shape, surrounded by water-permeable holes, which are convenient for the dissolution and diffusion of the corrosion inhibitor and the fungicide.

[0049] Step 5: Place multiple material bags containing composite preservatives in the seawater inside the steel pile at a predetermined distance. The specific operation steps are as follows:

[0050] A plurality of material bags containing the composite preservative are tied to a cable at a predetermined distance, wherein the cable is made of nylon rope or Kraft rope, or steel wire rope;

[0051] One end of the cable with multiple material bags is tied to the middle connection of the top beam or partition of the steel pile, and the other end is inserted into the seawater inside the steel pile, so that the composite preservative material bag is placed in the seawater in the middle of the steel pile.

[0052] To ensure uniform diffusion of the preservative, the cable should be placed in the middle of the steel pile or deviate from the middle by no more than 10% of the pipe diameter, but not close to the steel pile wall and the bottom should not touch the bottom of the steel pipe.

[0053] In a specific embodiment of the present invention, the predetermined distance includes the distance between the material bag near the bottom of the steel pile and the lowest end of the bottom of the steel pile, the distance between the material bag near the sea water surface and the water surface, and the distance between the material bags, wherein:

[0054] The steel pile contains static water, and the preservative can be considered to be in a free diffusion state. In order to ensure that the preservative is evenly distributed in the steel pile, the material bag should be hung in the middle of the steel pile so that the distance of the preservative diffusion to the steel pile wall is equal, and the distance to the nearest steel pile wall is half of the inner diameter of the steel pile D / 2. When the preservative diffuses horizontally to the steel pile wall, its diffusion distance in the vertical direction is also D / 2. Therefore, the minimum installation spacing of the material bag is D. At this time, the number of installed material bags n is the water height L in the steel pile ÷ installation spacing D.

[0055] Therefore, the distance between the material bag near the bottom of the steel pile and the lowest end of the bottom of the steel pipe is set to be less than or equal to half of the inner diameter of the steel pile and greater than 0; the distance between the material bag near the sea water surface and the water surface is less than or equal to the inner diameter of the steel pile and greater than 0; the material bags are placed at equal intervals, and the placement distance is 1-2 times the inner diameter of the steel pile.

[0056] Step 6: Regularly check the consumption of the composite preservative material package and replenish the composite preservative according to the consumption. Checking the consumption of the composite preservative material package includes the following steps:

[0057] During the inspection, the entire material bag string is lifted from the top to check whether the remaining amount of the composite preservative in each material bag and the concentration of the composite preservative dissolved in seawater meet the anti-corrosion threshold. When the remaining amount of the composite preservative in the material bag and the concentration of the composite preservative dissolved in seawater meet the anti-corrosion threshold, the composite preservative in the material bag is not replaced;

[0058] When the remaining amount of the composite preservative in the material bag and the concentration of the composite preservative dissolved in seawater do not meet the anti-corrosion threshold, the composite preservative in the material bag is replaced.

[0059] The present invention also provides an offshore wind power steel pile inner wall corrosion control device, the device is used in the above method, comprising:

[0060] A plurality of material bags containing composite preservatives are tied to the cable at a predetermined distance to form a material bag string;

[0061] Connect one end of the bag string to the top of the steel pile, and insert the other end into the seawater inside the steel pile.

[0062] The bottom of the material bag is in a pocket shape, the upper part is in a cylindrical shape, and a plurality of water-permeable holes are arranged around it; the composite preservative in the material bag is in a block shape.

[0063] The present invention also provides the use of the above-mentioned offshore wind power steel pile inner wall corrosion control device in the offshore wind power steel pile inner wall corrosion protection, wherein the offshore wind power steel pile inner wall corrosion protection includes preventing seawater corrosion and preventing microbial corrosion.

[0064] Through the above technical solutions, it can be known that the method for anti-corrosion of the inner wall of offshore wind power steel piles proposed in the present invention can achieve the simultaneous control of seawater erosion and microbial corrosion of the inner wall of the steel pile. The present invention achieves the purpose of comprehensive anti-corrosion by controlling the concentration of corrosion inhibitors and bactericides in the seawater inside the steel pile by quantitatively and point-to-point delivery of composite anti-corrosion agents. In the present invention, corrosion inhibitors and bactericides use existing mature and low-priced industrial products, and the cost of use is lower than the existing cathodic protection technology. The anti-corrosion effect is more excellent, and seawater corrosion and microbial corrosion can be simultaneously inhibited, and no by-products such as hydrogen are produced, and the safety risk is low.

[0065] The technical solution of the present invention will be further described below in conjunction with specific implementation methods.

[0066] like Figure 1 As shown, the anti-corrosion, antibacterial and monitoring method proposed in the present invention suspends an appropriate amount of soluble composite preservative material package in the seawater in the steel pile, and utilizes the dissolution and diffusion of the composite preservative material package to make the composite preservative components in the seawater reach an effective concentration range, thereby achieving the effect of preventing seawater corrosion and microbial corrosion.

[0067] Specifically, the composite preservative material package used in the present invention is compounded by a soluble solid corrosion inhibitor and a bactericide, wherein the corrosion inhibitor can be selected from inorganic salts (such as tungstates, antimonates, molybdates, borates, nitrites, nitrates, modified silicates, etc.) with mature market applications, organic (chain organic amines and their derivatives, imidazolines and their derivatives, quaternary ammonium salts, rosin amine derivatives, etc.) or composite corrosion inhibitors, preferably corrosion inhibitors with low cost, small dosage and good anti-corrosion effect on steel pile materials; bactericides can be chlorine-based, bromine-based, quaternary ammonium salts, etc., which have good killing effects on sulfate-reducing microorganisms.

[0068] The selected corrosion inhibitors and fungicides are mixed evenly in a certain proportion, and then pressed into a block-shaped composite preservative. The block-shaped composite preservative is placed in a material bag, which is made of non-metallic materials or corrosion-resistant metals. The bottom is in a pocket shape, carrying the composite preservative, and the upper part is cylindrical, with dense permeable holes around it, which is convenient for the dissolution and diffusion of the corrosion inhibitor and fungicide. The composite preservative material bag is tied to a cable, which is made of nylon rope or Kraft rope, or steel wire rope. The cable is tied to the middle of the crossbeam or partition at the top of the steel pile, so that the composite preservative material bag is placed in the seawater in the middle of the steel pile.

[0069] When in use, first calculate the water volume V in the steel pile according to the inner diameter D of the steel pile and the immersion depth L. Select suitable types of corrosion inhibitors and fungicides according to the steel pile material and environmental characteristics, and determine the effective concentration range. In the example of the present invention, the types of corrosion inhibitors and fungicides selected are organic amine fungicides and quaternary ammonium salt corrosion inhibitors, and the ratio of organic amine fungicides to quaternary ammonium salt corrosion inhibitors is 1:0.5.

[0070] Usually the dosage concentration of corrosion inhibitor is c 1 At 100~1000ppm, the concentration of fungicide is c 2 1~10ppm; then calculate the required corrosion inhibitor mass m according to the water volume 1 and biocide mass m 2 , the two are compounded to form a composite preservative. 1 =c 1 ×V;m 2 =c 2 ×V.

[0071] According to the immersion depth L and inner diameter D of the steel pile, determine the number n of composite preservative packages to be added, where the spacing between the packages is D to 2D, and the number n is approximately equal to the depth L ÷ spacing (D to 2D). In order to evenly distribute the corrosion inhibitors and fungicides in the water inside the steel pile, multiple composite preservative packages are placed at equal distances in the steel pile, with a spacing of D to 2D. The package at the bottom of the steel pile is no more than 0.5D away from the bottom of the steel pile, and the package at the top is no more than D away from the water surface. According to the determined number of packages, the compounded composite preservative is divided into n portions of equal mass, each containing m corrosion inhibitors. 1 / n and fungicide m 2 / n, each portion of the composite preservative is powdered and pressed into a mold and placed in a material bag.

[0072] Select the length of the cable according to the overall height of the steel pile from the bottom to the cabin, hang a composite preservative bag at the bottom of the cable, and then hang the corresponding bags upward in sequence according to the designed placement spacing. Hang the entire cable (together with the composite preservative bag) under the top beam or partition of the steel pile, so that the entire string of cables is placed in the middle of the steel pile as much as possible, and ensure that the lower end of the cable is no more than 0.5D away from the bottom, but does not touch the bottom.

[0073] Regularly check the consumption of composite preservative bags and replace them when necessary. During the inspection, lift the entire cable string from the top, check each bag, clean the residue and seawater in each bag, and re-place new composite preservatives according to the initial design amount.

[0074] Example:

[0075] The diameter of an offshore wind power steel pile is 6m. The water level of the steel pile is 30m below the waterline, and the water volume inside the steel pile is about 850m. 3 . Inorganic salt corrosion inhibitors (modified silicates) commonly used in seawater environments and fungicides (chlorine tablets) with good antibacterial effects on microorganisms such as sulfate-reducing bacteria are used for corrosion protection. Among them, the corrosion inhibitor dosage is designed to be 100ppm, and the fungicide concentration is designed to be 5ppm. A total of about 85kg of corrosion inhibitor and 4.5kg of fungicide are required. According to the inner diameter of the steel pile and the height of seawater, a total of 5 composite preservative material bags are arranged, each containing 17kg of corrosion inhibitor and 0.9kg of fungicide; the components in each material bag are mixed evenly and pressed into powder, placed in the middle, and then tied to the cable, with a spacing of about 6m between each material bag. During installation, the upper end of the cable is tied to the bottom plate of the cabin at the top of the steel pile, and the entire cable (including the composite preservative material bag) is suspended in the seawater in the middle of the steel pile. The cable length is adjusted so that the composite preservative material bag at the bottom is about 2m short from the bottom of the steel pile.

[0076] During use, the composite preservatives in each material package gradually dissolve in seawater, are distributed inside the steel pile through diffusion, and reach the surface of the steel pile. When the composite preservatives are fully dissolved and diffused evenly, the concentrations of corrosion inhibitors and antibacterial agents on the surface of the steel pile reach a reasonable range, thereby having an effective anti-corrosion effect.

[0077] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An offshore wind power steel pile inner wall corrosion control device, characterized in that: The device comprises a string of packages, wherein: One end of the material bag string is connected to the top of the steel pile, and the other end is inserted into the seawater inside the steel pile. The bottom of the material bag is in a pocket shape, the upper part is in a cylindrical shape, and a plurality of water-permeable holes are arranged around it; a composite preservative is placed in the material bag.

2. The device for controlling the inner wall corrosion of offshore wind power steel piles according to claim 1 is characterized in that: The material bag is tied to the cable at a predetermined distance, wherein the predetermined distance includes the distance between the material bag near the bottom of the steel pile and the bottom of the steel pile, the distance between the material bag near the sea water surface and the water surface, and the distance between the material bags.

3. The offshore wind power steel pile inner wall corrosion control device according to claim 2 is characterized in that: The distance between the material bag near the bottom of the steel pile and the bottom of the steel pile is less than or equal to half of the inner diameter of the steel pile and greater than 0; The distance between the material bag close to the seawater surface and the water surface is less than or equal to the inner diameter of the steel pile and greater than 0; The material bags are placed at equal intervals, and the distance between them is 1 to 2 times the inner diameter of the steel pile.

4. The offshore wind power steel pile inner wall corrosion control device according to claim 1 is characterized in that: The composite preservative in the material bag is in block shape.

5. The device for controlling the inner wall corrosion of offshore wind power steel piles according to any one of claims 1 to 4, characterized in that: The composite preservative comprises a corrosion inhibitor and a bactericide.

6. The device for controlling the inner wall corrosion of offshore wind power steel piles according to claim 5, characterized in that: The ratio of corrosion inhibitor to fungicide in the composite preservative is 0.1:1 to 1:

1.

7. The offshore wind power steel pile inner wall corrosion control device according to claim 5 is characterized in that: The dosing concentration of the corrosion inhibitor in the composite preservative is 100-1000 ppm, and the dosing concentration of the fungicide is 1-10 ppm.

8. The device for controlling the inner wall corrosion of offshore wind power steel piles according to claim 5, characterized in that: The corrosion inhibitor includes an inorganic salt corrosion inhibitor, an organic corrosion inhibitor or a composite corrosion inhibitor, wherein: The inorganic salt corrosion inhibitor includes tungstate, antimonate, molybdate, borate, nitrite, nitrate or modified silicate; Organic corrosion inhibitors include chain organic amines and their derivatives, imidazoline and its derivatives, quaternary ammonium salts or rosin amine derivatives.

9. The offshore wind power steel pile inner wall corrosion control device according to claim 5, characterized in that: The fungicide is selected from the group consisting of chloride fungicides, organic amine fungicides, organic bromide fungicides, organic acid fungicides, quaternary phosphate fungicides and composite fungicides.

10. A method for controlling the inner wall corrosion of offshore wind power steel piles, characterized in that: The method uses the device according to any one of claims 1 to 9, comprising the following steps: Calculate the volume of water inside the steel pile based on the inner diameter of the steel pile and the immersion depth; Determine the type of composite antiseptic according to the material of the steel pile and the environmental characteristics, wherein the composite antiseptic includes a corrosion inhibitor and a fungicide; Determine the amount of composite preservative according to the volume of water in the steel pile and the type of composite preservative; The determined amount of composite preservative is evenly divided and put into multiple material bags; A plurality of material bags containing the composite preservative are placed in the seawater inside the steel pile at a predetermined distance.

11. The method for controlling the inner wall corrosion of offshore wind power steel piles according to claim 10, characterized in that: Multiple material bags containing composite preservatives are placed in the seawater inside the steel pile at a predetermined distance, including: tying a plurality of material bags containing composite preservatives to the cable at predetermined distances; One end of the cable with multiple material bags is connected to the top of the steel pile, and the other end is inserted into the sea water inside the steel pile.

12. The method for controlling the inner wall corrosion of offshore wind power steel piles according to claim 10, characterized in that: The method further comprises: Regularly check the consumption of the composite preservative material package and replenish the composite preservative according to the consumption.

13. The method for controlling the inner wall corrosion of offshore wind power steel piles according to claim 10, characterized in that: Check the consumption of compound preservative packages. The following steps are involved: During inspection, the entire string of material bags is lifted from the top to check whether the remaining amount of the composite preservative in each material bag and the concentration of the composite preservative dissolved in seawater meet the anti-corrosion threshold.

14. The method for controlling the inner wall corrosion of offshore wind power steel piles according to claim 13, characterized in that: When the remaining amount of the composite preservative in the material bag and the concentration of the composite preservative dissolved in seawater meet the anti-corrosion threshold, the composite preservative in the material bag is not replaced; When the remaining amount of the composite preservative in the material bag and the concentration of the composite preservative dissolved in seawater do not meet the anti-corrosion threshold, the composite preservative in the material bag is replaced.

15. Application of the offshore wind power steel pile inner wall corrosion control device as claimed in claims 1 to 9 in the corrosion protection of the inner wall of offshore wind power steel piles, wherein: The inner wall anti-corrosion of offshore wind power steel piles includes preventing seawater corrosion and preventing microbial corrosion.

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