Cathodic protection system for the inner wall of offshore wind power monopile tower

Abstract

The invention discloses a cathodic protection system for the inner wall of an offshore wind power monopile tower, and relates to the technical field of offshore wind power anti-corrosion. The cathodic protection system for the inner wall of an offshore wind power monopile tower comprises an impressed current cathodic protection system, a gas monitoring system, a gas emission system and a control system, wherein the impressed current cathodic protection system, the gas monitoring system and the gas emission system are all electrically connected to the control system; when the monitored chlorine concentration exceeds a first preset threshold, the control system controls the impressed current cathodic protection system to reduce the current output value to reduce the chlorine concentration; when the monitored chlorine concentration exceeds a second preset threshold, and the second preset threshold is greater than the first preset threshold, the control system controls the gas emission system to start to discharge the chlorine outside the monopile tower; the technical solution provided by the invention can effectively reduce the corrosion of the inner wall of the monopile tower and the internal electronic equipment by harmful gases.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power anti-corrosion, and in particular to a cathodic protection system for the inner wall of an offshore wind power monopile tower. Background Art

[0002] In the corrosion protection of offshore platform steel structures, the inner wall of the monopile tower can be protected against corrosion by an impressed current cathodic protection system. During the operation of the impressed current cathodic protection system, chloride ions are generated during the electrolysis process, and oxidation reactions occur on the anode to generate gases such as chlorine. Chloride ions have an adverse effect on the electronic equipment installed in the monopile tower, causing damage or corrosion to the metal parts of the electronic equipment, thereby reducing their performance and life. In addition, when chloride ions combine with water, they may generate acidic substances, further exacerbating the corrosion problem of the inner wall of the monopile tower. Summary of the invention

[0003] The main purpose of the present invention is to propose a cathodic protection system for the inner wall of an offshore wind power monopile tower, aiming to reduce the corrosion of harmful gases on the inner wall of the monopile tower and internal electronic equipment.

[0004] To achieve the above-mentioned purpose, the present invention proposes a cathodic protection system for the inner wall of an offshore wind power monopile tower, comprising:

[0005] Impressed current cathodic protection system, used to protect the inner wall of the monopile tower from corrosion through impressed current;

[0006] A gas monitoring system for monitoring the concentration of chlorine gas generated during operation of the impressed current cathodic protection system;

[0007] A gas exhaust system, used to exhaust the chlorine gas generated during the operation of the impressed current cathodic protection system to the outside of the monopile tower;

[0008] a control system electrically connected to the impressed current cathodic protection system, the gas monitoring system and the gas exhaust system;

[0009] When the monitored chlorine concentration exceeds a first preset threshold, the control system controls the impressed current cathodic protection system to reduce the current output value to reduce the chlorine concentration;

[0010] When the monitored chlorine concentration exceeds a second preset threshold, and the second preset threshold is greater than the first preset threshold, the control system controls the gas discharge system to start, so as to discharge the chlorine outside the monopile tower.

[0011] In one embodiment, the impressed current cathodic protection system includes a power supply device, an auxiliary anode and a reference electrode. The power supply device is electrically connected to the control system for providing power and controlling current output. The auxiliary anode and the reference electrode are connected to the power supply device via a double-core cable and are both fixed on a single pile tower.

[0012] In one embodiment, the power supply device includes an electrically connected switching power supply module, a monitoring module and a control module, wherein the switching power supply module is used to provide power, the monitoring module is used to monitor the current output value, and the control module is electrically connected to the control system for controlling the size of the current output value.

[0013] In one embodiment, the impressed current cathodic protection system also includes a constant potentiostat, which is fixed at the top of the single pile tower and connected in series with the auxiliary anode via a cable, and the constant potentiostat is electrically connected to the power module and the monitoring module; a current sensor is connected in parallel to the auxiliary anode, and the current sensor is electrically connected to the monitoring module.

[0014] In one embodiment, the gas monitoring system includes an electrically connected monitoring power supply, a gas sensor, a data acquisition system and a central control unit, wherein the gas sensor is arranged inside the monopile tower and close to the sea surface, and the central control unit is electrically connected to the control system.

[0015] In one embodiment, the central control unit includes a display module and an alarm module, wherein the display module is used to display the monitored chlorine concentration, and the alarm module is used to issue an alarm prompt when the monitored chlorine concentration exceeds a first preset threshold value.

[0016] In one embodiment, the gas exhaust system includes a fan, a connecting pipe and an air duct structure, the fan is arranged at the air outlet of the monopile tower and is electrically connected to the control system, the air inlet of the fan is connected to the air outlet of the monopile tower through the connecting pipe, the air duct structure forms an air duct, the inlet of the air duct is connected to the air outlet of the fan, and the outlet of the air duct is connected to the external air of the monopile tower.

[0017] In one embodiment, the air duct structure includes a shell, and an air duct with two ends opened is formed inside the shell, one open end of the shell is connected to the air outlet of the fan, and the other open end is connected to the external air of the single pile tower; the gas exhaust system also includes a regulating mechanism, which is arranged inside the air duct and is used to adjust the air volume and / or direction of the gas in the air duct.

[0018] In one embodiment, the regulating mechanism is a plurality of regulating blades, which are distributed on the inner wall of the wind turbine at intervals along the circumference of the wind duct, and the regulating blades can move relative to the wind duct to adjust the air volume and / or direction of the gas in the wind duct.

[0019] In one embodiment, the cathodic protection system for the inner wall of the offshore wind power monopile tower further includes a gas recovery system, and the inlet of the gas recovery system is connected through the outlet of the gas exhaust system.

[0020] The technical solution of the present invention realizes the linkage effect of the impressed current cathodic protection system, the gas monitoring system, the gas emission system and the control system by adopting the electrical connection of the impressed current cathodic protection system, the gas monitoring system and the gas emission system. When the monitored chlorine concentration exceeds the first preset threshold value, the impressed current cathodic protection system reduces the current output value to reduce the chlorine concentration; when the monitored chlorine concentration exceeds the second preset threshold value, the control system controls the gas emission system to start to discharge the chlorine to the outside of the monopile tower, which can effectively reduce the corrosion of the inner wall of the monopile tower and the internal electronic equipment by harmful gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of an embodiment of a cathodic protection system for the inner wall of an offshore wind power monopile tower provided by the present invention.

[0023] Description of Figure Numbers:

[0024] 100. Monopile tower; 101. Tower base platform; 200. Impressed current cathodic protection system; 201. Auxiliary anode; 202. Reference electrode; 300. Gas monitoring system; 301. Gas sensor; 400. Gas emission system; 500. Control system; 600. Gas recovery system.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] 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.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The present invention proposes a cathodic protection system for the inner wall of an offshore wind power monopile tower 100, aiming to reduce the corrosion of harmful gases on the inner wall of the monopile tower 100 and internal electronic equipment.

[0030] See also Figure 1 In one embodiment of the present invention, the cathodic protection system for the inner wall of the offshore wind power monopile tower 100 includes:

[0031] An impressed current cathodic protection system 200 is used to provide corrosion protection to the inner wall of the monopile tower 100 by means of impressed current;

[0032] The gas monitoring system 300 is used to monitor the chlorine gas concentration generated during the operation of the impressed current cathodic protection system 200;

[0033] The gas exhaust system 400 is used to exhaust the chlorine gas generated during the operation of the impressed current cathodic protection system 200 to the outside of the monopile tower 100;

[0034] A control system 500 is electrically connected to the impressed current cathodic protection system 200, the gas monitoring system 300 and the gas exhaust system 400;

[0035] When the monitored chlorine concentration exceeds a first preset threshold, the control system 500 controls the impressed current cathodic protection system 200 to reduce the current output value to reduce the chlorine concentration;

[0036] When the monitored chlorine concentration exceeds the second preset threshold, and the second preset threshold is greater than the first preset threshold, the control system 500 controls the gas discharge system 400 to start, so as to discharge the chlorine to the outside of the monopile tower 100 .

[0037] In this embodiment, the gas is chlorine, which is a harmful gas and has a certain corrosive effect on the inner wall of the monopile tower 100 and the internal electronic equipment. Among them, the impressed current cathodic protection system 200 is to perform anti-corrosion protection on the inner wall of the monopile tower 100 through impressed current, the gas monitoring system 300 is used to monitor the chlorine concentration generated during the operation of the impressed current cathodic protection system 200, and the gas exhaust system 400 is used to exhaust the chlorine generated during the operation of the impressed current cathodic protection system 200 to the outside of the monopile tower 100, and the impressed current cathodic protection system 200, the gas monitoring system 300, and the gas exhaust system 400 are all electrically connected to the control system 500, so that the impressed current cathodic protection system 200 can be realized. 00. The gas monitoring system 300 and the gas emission system 400 work in conjunction. When the monitored chlorine concentration exceeds a first preset threshold, the control system 500 controls the impressed current cathodic protection system 200 to reduce the current output value, thereby reducing the chlorine concentration. When the monitored chlorine concentration exceeds a second preset threshold, and the second preset threshold is greater than the first preset threshold, the control system 500 controls the gas emission system 400 to start, so as to discharge the chlorine outside the monopile tower 100. This can effectively reduce the corrosion of the inner wall of the monopile tower 100 and the internal electronic equipment by harmful gases.

[0038] The technical solution of the present invention realizes the linkage effect of the impressed current cathodic protection system 200, the gas monitoring system 300 and the gas emission system 400 by adopting the electrical connection of the impressed current cathodic protection system 200, the gas monitoring system 300, and the gas emission system 400, thereby effectively reducing the corrosion of harmful gases on the inner wall of the single pile tower 100 and the internal electronic equipment.

[0039] It should be noted that the first preset threshold is the safety limit value of the chlorine concentration, and the second preset threshold is the dangerous value of the chlorine concentration. The specific values ​​can be set by the user according to actual conditions.

[0040] In one embodiment of the present invention, the impressed current cathodic protection system 200 includes a power supply device, an auxiliary anode 201 and a reference electrode 202. The power supply device is electrically connected to the control system 500 for providing power and controlling current output. The auxiliary anode 201 and the reference electrode 202 are connected to the power supply device via a double-core cable and are both fixed on the monopile tower 100.

[0041] In this embodiment, a tower base platform 101 is provided in the monopile tower 100. The tower base platform 101 is located at the bottom of the monopile tower 100 near the sea surface and is used to place some electronic equipment. The lower part of the tower base platform 101 forms a closed space. The chlorine gas generated during the operation of the impressed current cathodic protection system 200 is filled in the closed space. The tower base platform 101 is provided with an outlet for exhausting gas. The control system 500 is placed on the tower base platform 101. The auxiliary anode 201 is a noble metal oxide anode, that is, a layer of noble metal oxide coating with electrocatalytic activity is covered on the titanium substrate. The noble metal oxide coating has small polarization and extremely low consumption rate, and is suitable for seawater medium. Its function is to transfer the DC current output by the DC power supply from the medium to the protected metal structure (that is, the inner wall of the monopile tower 100 and the surface of the electronic equipment on the inner wall). The reference electrode 202 is used to measure the potential of the protected metal structure, and the cathodic protection effect can be evaluated by measuring the potential. The auxiliary anode 201 and the reference electrode 202 are connected to a power supply device via a double-core cable and fixed on the monopile tower 100 , and are located in the seawater in a closed space at the bottom of the tower base platform 101 .

[0042] It should be noted that the cathode of the impressed current cathodic protection system 200 is connected to the monopile tower 100, and the distance between the auxiliary anode 201 and the inner wall of the monopile tower 100 is greater than 2 m.

[0043] Optionally, the inner wall and the outer wall of the monopile tower 100 are provided with an anti-corrosion coating, the reference electrode 202 is fixedly set at the bottom of the monopile tower 100, and multiple groups of auxiliary anodes 201 are provided, and the multiple groups of auxiliary anodes 201 are arranged at intervals, and the multiple groups of auxiliary anodes 201 are connected to a power supply device via cables.

[0044] In a specific embodiment of the present invention, the power supply device includes an electrically connected switching power supply module, a monitoring module and a control module, the switching power supply module is used to provide power, the monitoring module is electrically connected to the current sensor, and is used to receive the current value monitored by the current sensor, and the control module is electrically connected to the control system 500, and is used to control the size of the current output value.

[0045] In this embodiment, the power supply device has the functions of power supply, monitoring and control, is relatively intelligent, and operates relatively stably.

[0046] In one embodiment of the present invention, the impressed current cathodic protection system 200 also includes a constant potential meter, which is fixed on the top of the single pile tower 100 and connected in series with the auxiliary anode 201 through a cable, and the constant potential meter is electrically connected to the power module and the monitoring module; a current sensor is connected in parallel to the auxiliary anode 201, and the current sensor is electrically connected to the monitoring module.

[0047] Specifically, the potentiostat is fixed on the top platform of the single pile tower 100, the input end of the potentiostat is connected to the power module, the output end is connected to the monitoring module, the current sensor is arranged in parallel with the auxiliary anode 201, and is electrically connected to the monitoring module, for measuring the current generated on the auxiliary anode 201, and sending the measured current value to the monitoring module. When there are multiple groups of auxiliary anodes 201, the current sensors are correspondingly arranged in multiples, one current sensor is arranged in parallel with a corresponding auxiliary anode 201, and multiple current sensors are electrically connected to the monitoring module. The monitoring module receives the current value measured by the current sensor and the output current value on the potentiostat. By comparing the current values ​​of the two, the shedding of the anti-corrosion coating can be estimated. According to the shedding situation, the staff can repair the anti-corrosion coating to prevent pile foundation corrosion. Specifically: if the difference between the two currents is larger, it means that the shedding of the anti-corrosion coating is more serious.

[0048] In one embodiment of the present invention, the gas monitoring system 300 includes an electrically connected monitoring power supply, a gas sensor 301, a data acquisition system and a central control unit. The gas sensor 301 is arranged inside the single pile tower 100 and close to the sea surface. The central control unit is electrically connected to the control system 500.

[0049] In this embodiment, the gas sensor 301 is used to monitor the chlorine concentration generated during the operation of the impressed current cathodic protection system 200, and sends the real-time monitored chlorine concentration value to the data acquisition system. The data acquisition system collects the data sent by the gas sensor 301 and transmits it to the central control unit. The transmission method can be selected as wireless network transmission or wired network transmission.

[0050] In a specific embodiment of the present invention, the central control unit includes a display module and an alarm module. The display module is used to display the monitored chlorine concentration, and the alarm module is used to issue an alarm prompt when the monitored chlorine concentration exceeds a first preset threshold.

[0051] In this embodiment, the display module may be a display screen for displaying the monitored chlorine concentration, which is intuitive and convenient for users to view. The alarm module may be an alarm. When the monitored chlorine concentration exceeds the first preset threshold, the alarm immediately issues an alarm prompt to remind the user, and the control system 500 controls the impressed current cathodic protection system 200 to reduce the current output value to reduce the chlorine concentration.

[0052] In a specific embodiment of the present invention, the gas exhaust system 400 includes a fan, a connecting pipe and an air duct structure. The fan is arranged at the air outlet of the monopile tower 100 and is electrically connected to the control system 500. The air inlet of the fan is connected to the air outlet of the monopile tower 100 through a connecting pipe. The air duct structure forms an air duct, the inlet of the air duct is connected to the air outlet of the fan, and the outlet of the air duct is connected to the external air of the monopile tower 100.

[0053] When the chlorine concentration monitored by the gas sensor 301 exceeds the second preset threshold, and the second preset threshold is greater than the first preset threshold, the control system 500 controls the gas blower to start, and discharges the chlorine to the outside of the monopile tower 100 through the connecting pipe and the air duct structure, thereby achieving the purpose of reducing the chlorine concentration on the inner wall of the monopile tower 100, and effectively reducing the corrosion of harmful gases to the inner wall of the monopile tower 100 and internal electronic equipment.

[0054] In a specific embodiment of the present invention, the air duct structure includes a shell, which is roughly cylindrical, and an air duct with two ends opened is formed inside the shell. One open end of the shell is connected to the air outlet of the fan, and the other open end is connected to the external air of the single pile tower 100; the gas exhaust system 400 also includes a regulating mechanism, which is arranged inside the air duct and is used to adjust the air volume and / or direction of the gas in the air duct.

[0055] In a specific embodiment of the present invention, the regulating mechanism is a plurality of regulating blades, which are distributed on the inner wall of the wind turbine at intervals along the circumference of the wind duct, and the regulating blades can move relative to the wind duct to adjust the air volume and / or direction of the gas in the wind duct.

[0056] In this embodiment, a part of the adjusting blades are arranged near the inlet of the air duct, and the adjusting blades are rotatably connected to the inner wall of the shell. The specific connection method is not limited, as long as the cross-sectional area of ​​the air duct can be changed during the rotation of the adjusting blades to achieve the purpose of adjusting the gas flow; the other part of the adjusting blades are arranged at the air outlet of the wind power, specifically, they are rotatably connected to the end of the shell. The specific connection method is not limited, as long as the purpose of changing the gas flow direction can be achieved during the rotation of the adjusting blades.

[0057] In some other embodiments, a regulating valve is provided on the connecting pipeline, and the regulating valve is electrically connected to the control system 500 for controlling the switch and opening of the regulating valve to achieve air volume regulation.

[0058] It should be noted that the control system 500 is responsible for monitoring and controlling the operation of the gas exhaust system 400. Optionally, the control system 500 includes a manual control panel, a sensor, an automatic adjustment device, and an intelligent control integrated with other systems. The manual control panel is a part of the control system, which is used to manually operate and control various components of the exhaust system, and generally includes switches, knobs, buttons, etc., which are used to start and stop the fan, adjust the air volume, control the adjustment mechanism, etc.; the sensor includes a temperature sensor, a humidity sensor, a gas sensor, etc., which is used to monitor environmental parameters such as temperature, humidity, air flow speed, chlorine concentration, etc. These sensors can be installed in the air duct, indoor space or other appropriate locations, and transmit the collected data to the control system 500; the automatic adjustment device automatically adjusts the operating parameters of the gas exhaust system 400 according to the data collected by the sensor, and can be connected with the fan, the regulating valve, the air volume regulator, etc., and realizes the adjustment of the air volume and the control of the direction by controlling their opening, speed or other parameters. The automatic adjustment device can be adjusted based on a preset threshold or according to real-time needs.

[0059] In one embodiment of the present invention, the cathodic protection system for the inner wall of the offshore wind power monopile tower 100 further includes a gas recovery system 600, and the inlet of the gas recovery system 600 is connected through the outlet of the gas discharge system 400. Since the gas is chlorine, a large amount of chlorine discharged into the external air will have an impact on the environment, so the gas recovery system 600 can be set to avoid the impact of chlorine on the environment and achieve an environmentally friendly effect.

[0060] Optionally, the gas recovery system 600 is a gas storage tank for storing the discharged chlorine gas to facilitate the recovery and reuse of the chlorine gas. Of course, the gas recovery system 600 can also be an absorption tower equipped with alkaline substances to effectively recover the discharged chlorine gas.

[0061] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cathodic protection system for the inner wall of an offshore wind power monopile tower, characterized in that: include: Impressed current cathodic protection system, used to protect the inner wall of the monopile tower from corrosion through impressed current; A gas monitoring system for monitoring the concentration of chlorine gas generated during operation of the impressed current cathodic protection system; A gas exhaust system, used to exhaust the chlorine gas generated during the operation of the impressed current cathodic protection system to the outside of the monopile tower; a control system electrically connected to the impressed current cathodic protection system, the gas monitoring system and the gas exhaust system; When the monitored chlorine concentration exceeds a first preset threshold, the control system controls the impressed current cathodic protection system to reduce the current output value to reduce the chlorine concentration; When the monitored chlorine concentration exceeds a second preset threshold, and the second preset threshold is greater than the first preset threshold, the control system controls the gas discharge system to start, so as to discharge the chlorine outside the monopile tower.

2. The cathodic protection system for the inner wall of the offshore wind power monopile tower according to claim 1, characterized in that: The impressed current cathodic protection system includes a power supply device, an auxiliary anode and a reference electrode. The power supply device is electrically connected to the control system for providing power and controlling current output. The auxiliary anode and the reference electrode are connected to the power supply device via a double-core cable and are both fixed on the monopile tower.

3. The cathodic protection system for the inner wall of the offshore wind power monopile tower as claimed in claim 2, characterized in that: The power supply device includes an electrically connected switching power supply module, a monitoring module and a control module, wherein the switching power supply module is used to provide power, the monitoring module is used to monitor the current output value, and the control module is electrically connected to the control system and is used to control the magnitude of the current output value.

4. The cathodic protection system for the inner wall of the offshore wind power monopile tower as claimed in claim 3, characterized in that: The impressed current cathodic protection system further comprises a constant potential instrument, which is fixed on the top of the monopile tower and connected in series with the auxiliary anode via a cable, and is electrically connected to the power module and the monitoring module; A current sensor is connected in parallel to the auxiliary anode, and the current sensor is electrically connected to the monitoring module.

5. The cathodic protection system for the inner wall of the offshore wind power monopile tower as claimed in claim 1, characterized in that: The gas monitoring system includes an electrically connected monitoring power supply, a gas sensor, a data acquisition system and a central control unit. The gas sensor is arranged inside the monopile tower and close to the sea surface. The central control unit is electrically connected to the control system.

6. The cathodic protection system for the inner wall of the offshore wind power monopile tower as claimed in claim 5, characterized in that: The central control unit includes a display module and an alarm module. The display module is used to display the monitored chlorine concentration, and the alarm module is used to issue an alarm prompt when the monitored chlorine concentration exceeds a first preset threshold.

7. The cathodic protection system for the inner wall of the offshore wind power monopile tower according to claim 1, characterized in that: The gas exhaust system includes a fan, a connecting pipe and an air duct structure. The fan is arranged at the air outlet of the monopile tower and is electrically connected to the control system. The air inlet of the fan is connected to the air outlet of the monopile tower through the connecting pipe. The air duct structure forms an air duct. The inlet of the air duct is connected to the air outlet of the fan, and the outlet of the air duct is connected to the external air of the monopile tower.

8. The cathodic protection system for the inner wall of the offshore wind power monopile tower as claimed in claim 7, characterized in that: The air duct structure comprises a shell, and an air duct with two openings at both ends is formed inside the shell, one opening end of the shell is connected to the air outlet of the fan, and the other opening end is connected to the external air of the monopile tower; The gas exhaust system further comprises a regulating mechanism, which is arranged inside the air duct and is used to regulate the air volume and / or direction of the gas in the air duct.

9. The cathodic protection system for the inner wall of the offshore wind power monopile tower as claimed in claim 8, characterized in that: The regulating mechanism is a plurality of regulating blades, which are distributed at intervals along the circumference of the wind duct on the inner wall of the wind turbine, and the regulating blades can move relative to the wind duct to adjust the air volume and / or direction of the gas in the wind duct.

10. The cathodic protection system for the inner wall of an offshore wind power monopile tower according to any one of claims 1 to 9, characterized in that: The offshore wind power monopile tower inner wall cathodic protection system also includes a gas recovery system, and the inlet of the gas recovery system is connected through the outlet of the gas exhaust system.

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