A design method for hydrogen discharge system of offshore wind turbine monopile foundation

Abstract

The present invention relates to the technical field of offshore wind power generation, and discloses a design method for a hydrogen discharge system of a single pile foundation of an offshore wind turbine. The design method for a hydrogen discharge system of a single pile foundation comprises the following steps: calculating the volume concentration of hydrogen in the single pile foundation; when the volume concentration of hydrogen is less than the safety threshold of the volume concentration of hydrogen, the interior of the single pile foundation discharges hydrogen through the exhaust system in a natural ventilation manner as the tide rises and falls; when the volume concentration of hydrogen is greater than or equal to the safety threshold of the volume concentration of hydrogen, a suction piece is required to be provided in the exhaust system, and the hydrogen in the single pile foundation is extracted through the suction piece. The present invention calculates the volume concentration of hydrogen inside the single pile foundation, and selects natural ventilation or ventilation using a suction piece according to the volume concentration of hydrogen to discharge hydrogen, so as to discharge the hydrogen generated in the single pile foundation. This prevents explosion accidents caused by hydrogen accumulation in the single pile foundation, which endanger the structural safety and operational stability of offshore wind turbines.

Description

Technical Field

[0001] The invention relates to the technical field of offshore wind power generation, and in particular to a design method for a hydrogen discharge system of a single pile foundation of an offshore wind turbine. Background Art

[0002] Wind power generation is one of the important directions in the development of renewable energy. Wind turbines are wind power generation equipment that captures wind energy and converts it into electrical energy. As wind power generation becomes increasingly important in the global energy structure, offshore wind power generation has attracted widespread attention due to its advantages such as rich resources and no land occupation. The scale and number of offshore wind farms are also increasing year by year.

[0003] If a wind turbine is to be installed at sea, it must first have a stable foundation. Common foundation structures include: single pile foundation, multi-pile steel cap foundation, multi-leg steel cap foundation, etc. There is seawater inside the single pile foundation of an offshore wind turbine. In order to protect the underwater structure of the single pile foundation from seawater corrosion, an active anti-corrosion system is usually set up. The active anti-corrosion system uses an impressed current cathodic protection method for anti-corrosion, that is, the inner wall of the single pile foundation is connected to the negative pole of the external power supply, so that when the external power supply applies current to the single pile foundation, the single pile foundation becomes the cathode, and the auxiliary anode is connected to the positive pole of the power supply. The current flows from the auxiliary anode into the seawater and then flows into the single pile foundation, causing the electrons to accumulate on the inner wall of the single pile foundation, inhibiting the oxidation reaction of the metal losing electrons, thereby slowing down or stopping the corrosion of the single pile foundation. However, during the anti-corrosion process, the cathode, that is, the inner wall of the single pile foundation, undergoes an electrochemical reaction to produce hydrogen. Since the interior of the single pile foundation is a closed space, hydrogen will gradually accumulate in a closed environment. When the volume concentration of hydrogen is 4.0%~74.2%, it may cause an explosion, endangering the structural safety and operational stability of the entire offshore wind turbine. Summary of the invention

[0004] In view of this, the present invention provides a design method for a hydrogen discharge system of an offshore wind turbine monopile foundation to solve the problem that hydrogen accumulation in the closed space of the offshore wind turbine monopile foundation may cause explosion, endangering the structural safety and operating stability of the offshore wind turbine.

[0005] The present invention provides a method for designing a hydrogen discharge system of a monopile foundation of an offshore wind turbine, which is applied to hydrogen discharge of a monopile foundation of an offshore wind turbine. The monopile foundation comprises: a monopile section and a transition section, wherein the transition section is arranged on the monopile section, and an airtight platform is arranged below the connection between the monopile section and the transition section. The method for designing a hydrogen discharge system comprises the following steps:

[0006] Calculating the volume concentration of hydrogen in the monopile foundation;

[0007] When the hydrogen volume concentration is less than the hydrogen volume concentration safety threshold, the hydrogen inside the single pile foundation is discharged by natural ventilation through the exhaust system with the rise and fall of the tide. When the hydrogen volume concentration is greater than or equal to the hydrogen volume concentration safety threshold, a vacuum device must be installed in the exhaust system to extract the hydrogen in the single pile foundation through the vacuum device.

[0008] Beneficial Effects

[0009] This hydrogen discharge system design method can discharge the hydrogen generated in the single pile foundation, preventing explosion accidents caused by hydrogen accumulation in the single pile foundation, which would endanger the structural safety and operational stability of the offshore wind turbine.

[0010] In an optional embodiment, the hydrogen volume concentration is expressed by the formula Calculated, where C is the volume concentration of hydrogen, is the hydrogen production rate, is the rate of air change caused by tidal changes; ,in is the volume difference between high and low tide levels, ,in is the cross-sectional radius of the single pile section at the high tide level, is the cross-sectional radius of the single pile section at the low tide level.

[0011] Beneficial Effects

[0012] The hydrogen volume concentration can be accurately calculated through the hydrogen production rate in the single pile foundation and the volume difference between high and low tide levels during tidal fluctuations, making it easier to choose different hydrogen discharge methods based on the hydrogen volume concentration.

[0013] In an optional embodiment, the hydrogen volume concentration safety threshold is less than or equal to the hydrogen volume concentration lower explosion limit.

[0014] Beneficial Effects

[0015] The lower explosion limit of hydrogen volume concentration is 4%, which makes the safety threshold of hydrogen volume concentration less than or equal to 4%. This can ensure that there will be no explosion due to hydrogen accumulation in the single pile foundation, preventing potential safety accidents.

[0016] In an optional embodiment, the exhaust system includes: an exhaust port and an exhaust duct, the exhaust port is arranged in the single pile section and is located below the airtight platform; the exhaust duct is arranged on the inner wall of the single pile foundation, and the air outlet end of the exhaust duct extends to the outside of the transition section, and the exhaust component is arranged in the exhaust duct.

[0017] Beneficial Effects

[0018] There is a space for gas to exist between the airtight platform and the water surface in the single pile section, and hydrogen, which has a lower density than air, will float on the top of the space, that is, near the airtight platform. The hydrogen can be discharged through the exhaust port and exhaust pipe set at the airtight platform, and the hydrogen discharge effect is better.

[0019] In an optional implementation, two exhaust ports are provided on the single pile segment, and the two exhaust ports are arranged opposite to each other.

[0020] Beneficial Effects

[0021] The two relatively arranged exhaust ports are spaced far apart, which improves the gas circulation effect, improves the hydrogen exhaust efficiency, and improves the ventilation effect.

[0022] In an optional embodiment, an air hole is opened on the airtight platform, and the air inlet end of the exhaust pipe is connected to the air hole.

[0023] In an optional embodiment, a radial droplet separator is provided on the exhaust pipe.

[0024] Beneficial Effects

[0025] The radial droplet separator can prevent the electric components such as the vacuum components from being damaged by the water droplets.

[0026] In an optional implementation, a transition platform is provided in the transition section, a timing controller is provided on the transition platform, and the timing controller is connected to the air suction component.

[0027] Beneficial Effects

[0028] The vacuum part is controlled by a timing controller, and is opened and closed at a fixed time, which saves energy and has strong stability.

[0029] In an optional embodiment, the air suction member is a fan.

[0030] In an optional embodiment, an airflow switch is provided in the fan.

[0031] Beneficial Effects

[0032] The use of the airflow switch is used to detect whether the fan is operating normally, and timely feedback on the working status of the fan is provided to prevent fan failure from causing hydrogen to fail to be discharged in time, resulting in hydrogen accumulation and accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of a single pile foundation of an offshore wind turbine of the present invention;

[0035] Figure 2 It is a schematic diagram of a single pile section in a single pile foundation of an offshore wind turbine of the present invention;

[0036] Figure 3 It is a schematic diagram of the exhaust system in the design method of the hydrogen exhaust system of the offshore wind turbine monopile foundation of the present invention;

[0037] Figure 4 Schematic diagram of the exhaust pipe in the exhaust system.

[0038] Description of reference numerals:

[0039] 11. Single pile section, 12. Transition section, 13. Airtight platform, 14. Transition platform, 15. High tide level, 16. Low tide level;

[0040] 21. suction member, 22. exhaust port, 23. exhaust duct, 231. air outlet, 232. air inlet, 24. radial droplet separator, 25. air flow switch, 26. fixing device. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0043] According to an embodiment of the present invention, on the one hand, a design method for a hydrogen discharge system of a monopile foundation of an offshore wind turbine is provided, which is applied to the hydrogen discharge of a monopile foundation of an offshore wind turbine. The monopile foundation comprises: a monopile section 11 and a transition section 12. The transition section 12 is arranged on the monopile section 11, and an airtight platform 13 is arranged below the connection between the monopile section 11 and the transition section 12.

[0044] Specifically, in the present embodiment, the bottom of the single pile segment 11 is truncated cone-shaped, that is, the diameter of the single pile segment 11 decreases evenly from bottom to top, and the top of the single pile segment 11 is cylindrical. There is seawater in the single pile segment 11 and the water surface rises and falls with the tide. The bottom end of the transition segment 12 is connected to the top of the single pile segment 11, and the top of the transition segment 12 is connected to the tower of the wind turbine generator set. The airtight platform 13 is located in the single pile segment 11 and below the connection between the single pile segment 11 and the transition segment 12, and the airtight platform 13 is used to achieve airtightness between the single pile segment 11 and the transition segment 12. That is to say, all the gas in the single pile segment 11 exists between the airtight platform 13 and the water surface, and hydrogen is lighter than air and tends to float near the airtight platform 13.

[0045] The hydrogen removal system design method includes the following steps:

[0046] Calculate the volume concentration of hydrogen in a single pile foundation;

[0047] When the hydrogen volume concentration is less than the hydrogen volume concentration safety threshold, the hydrogen inside the single pile foundation is discharged through the exhaust system in a natural ventilation manner as the tide rises and falls. When the hydrogen volume concentration is greater than or equal to the hydrogen volume concentration safety threshold, a vacuum device 21 must be installed in the exhaust system to extract the hydrogen inside the single pile foundation through the vacuum device 21.

[0048] First, the hydrogen volume concentration in the single pile section 11 of the single pile foundation is calculated. When the hydrogen volume concentration is less than the preset hydrogen volume concentration safety threshold, an exhaust system is set inside the single pile foundation and the hydrogen is discharged by natural ventilation through the exhaust system. The natural ventilation method is that the water level in the single pile section 11 of the single pile foundation will change periodically between the high tide level 15 and the low tide level 16 with the rise and fall of the tide. In the process of rising from the low tide level 16 to the high tide level 15, the volume space of the gas in the single pile foundation gradually decreases, and the hydrogen can be "pushed" out of the single pile foundation through the exhaust system to achieve hydrogen discharge; in the process of falling from the high tide level 15 to the low tide level 16, the volume space of the gas in the single pile foundation gradually increases, and natural air will be added through the exhaust system, so that natural hydrogen discharge and ventilation can be achieved with the periodic changes of the tide rise and fall, and the hydrogen concentration can be reduced. However, when the hydrogen volume concentration is greater than or equal to the preset hydrogen volume concentration safety threshold, the hydrogen cannot be discharged in time by relying on natural ventilation. Therefore, it is necessary to additionally set up a vacuum pump 21. After the vacuum pump 21 is started, the hydrogen in the single pile section 11 can be extracted and discharged to the outside of the single pile foundation, thereby realizing rapid hydrogen discharge.

[0049] This hydrogen exhaust system design method uses the exhaust system for natural ventilation or adds a vacuum device 21 to the exhaust system to actively exhaust the hydrogen generated in the single pile foundation according to the volume concentration of hydrogen generated in the single pile foundation, thereby ensuring that the volume concentration of hydrogen in the single pile foundation is less than a preset safety threshold of the volume concentration of hydrogen, and preventing accidents caused by hydrogen accumulation in the single pile foundation.

[0050] In one embodiment, the hydrogen volume concentration is given by the formula Calculated, where C is the volume concentration of hydrogen, is the hydrogen production rate, is the rate of air change caused by tidal changes;

[0051] ,in is the volume difference between high and low tide levels;

[0052] ,in is the cross-sectional radius of the single pile section 11 at the high tide level 15, is the cross-sectional radius of the single pile section 11 at the low tide level 16.

[0053] Since the bottom of the single pile section 11 is in the shape of a truncated cone, the volume change caused by the low tide level 16 to the high tide level 15 during the tidal change is equal to the volume of a truncated cone. The top surface of the truncated cone is the cross-sectional circle of the single pile section 11 at the high tide level 15, and the bottom surface of the truncated cone is the cross-sectional circle of the single pile section 11 at the low tide level 16. That is, the volume calculation formula of the truncated cone can calculate the volume difference caused by a tidal rise and fall, that is, the ventilation volume. The tidal cycle is about 25 hours, and each cycle includes two tidal high tides 15 and two tidal low tides 16. Therefore, the tide causes the air exchange rate inside the single pile foundation every day. for: . Hydrogen production rate That is, the rate at which hydrogen is produced when an electrochemical reaction occurs on the inner wall of the single pile segment 11. It can be measured by monitoring equipment, combined with the hydrogen production rate and the air exchange rate inside the single pile foundation By formula The hydrogen volume concentration C can be calculated.

[0054] In other embodiments, if the monopile section 11 is cylindrical as a whole, the volume difference between high and low tide levels is , where R is the cross-sectional radius of the single pile section 11, and h is the height difference between the high tide level 15 and the low tide level 16.

[0055] In one embodiment, the hydrogen volume concentration safety threshold is less than or equal to the hydrogen volume concentration lower explosion limit.

[0056] When the hydrogen volume concentration is 4.0% to 74.2%, an explosion will occur, that is, the lower explosion limit of the hydrogen volume concentration is 4.0%, and the hydrogen volume concentration safety threshold is less than or equal to 4.0%, which can ensure that there is no risk of explosion in the single pile foundation. In this embodiment, the hydrogen volume concentration safety threshold is equal to the hydrogen volume concentration explosion lower limit, that is, when the hydrogen volume concentration in the single pile section 11 is less than 4%, the hydrogen is discharged through natural ventilation of the exhaust system, and when the hydrogen volume concentration in the single pile section 11 is greater than or equal to 4%, hydrogen needs to be extracted through the exhaust member 21 for hydrogen discharge.

[0057] For example, when the hydrogen generation rate in the single pile section 11 is 3.95m 3 / d, the cross-sectional radius of the single pile section 11 at the high tide level 15 is 6042mm, and the cross-sectional radius of the single pile section 11 at the low tide level 16 is 6326mm. The volume difference between the high and low tide levels, i.e., the ventilation volume, is calculated as follows:

[0058]

[0059] The rate of air change due to tidal changes is:

[0060]

[0061] Then the volume concentration of hydrogen in the single pile section 11 is:

[0062]

[0063] Since the volume concentration of hydrogen C is less than 4%, there is no need to set up the exhaust component 21, and hydrogen can be discharged by natural ventilation.

[0064] When the hydrogen generation rate in the single pile section 11 is 6m 3 / d, the volume concentration of hydrogen in the single pile section 11 is:

[0065]

[0066] Since the volume concentration of hydrogen C>4%, it is necessary to set up a vacuum component 21 to discharge hydrogen through the vacuum component 21.

[0067] In other embodiments, the hydrogen volume concentration safety threshold may be 2.0%, 2.5%, 3.0%, 3.5%, etc.

[0068] In some embodiments, the exhaust system includes: an exhaust port 22 and an exhaust pipe 23, the exhaust port 22 is arranged on the single pile section 11 and is located below the airtight platform 13; the exhaust pipe 23 is arranged on the inner wall of the single pile foundation, and the exhaust end 231 of the exhaust pipe 23 extends to the outside of the transition section 12, and the exhaust component 21 is arranged on the exhaust pipe 23.

[0069] At high tide, the water level in the monopile section 11 rises and squeezes the hydrogen to be discharged from the exhaust port 22 and the exhaust pipe 23. At low tide, outside air will enter the monopile section 11 from the exhaust port 22 and the exhaust pipe 23, thereby completing the natural ventilation cycle.

[0070] The suction member 21 disposed in the exhaust pipe 23 can be activated to quickly extract the hydrogen in the monopile segment 11 , and the outside air can be replenished into the monopile segment 11 from the exhaust port 22 .

[0071] In one embodiment, two exhaust ports 22 are disposed on the single pile segment 11 , and the two exhaust ports 22 are disposed opposite to each other.

[0072] The two exhaust ports 22 arranged opposite to each other are spaced far apart, so that the gas circulation effect is good, the hydrogen exhaust efficiency is improved, and the ventilation effect is better.

[0073] In other embodiments, a plurality of exhaust ports 22 may be provided on the single pile segment 11 , for example, four exhaust ports 22 may be provided, and the angle between two adjacent exhaust ports 22 is 90°, so as to have a larger exhaust area.

[0074] In one embodiment, an air hole is opened on the airtight platform 13, and the air inlet end 232 of the exhaust pipe 23 is connected to the air hole.

[0075] The airtight platform 13 realizes the airtightness between the monopile section 11 and the transition section 12. Therefore, in order for the exhaust pipe 23 to smoothly discharge hydrogen, air holes need to be opened on the airtight platform 13, and the number of air holes is equal to the number of exhaust pipes 23. After the air holes are set, the air inlet end 232 of the exhaust pipe 23 is connected to the air holes, and hydrogen can smoothly enter the exhaust pipe 23. The exhaust pipe 23 extends upward along the axial direction of the monopile foundation until the top of the transition section 12, and then the air outlet end 231 extends out of the transition section 12 for exhaust. In this embodiment, two exhaust pipes 23 are provided, so two air holes are correspondingly opened on the airtight platform 13.

[0076] Furthermore, the exhaust pipe 23 is fixed to the inner wall of the transition section 12 by a fixing device 26 in the transition section 12 .

[0077] Specifically, the fixing device 26 adopts a support frame structure, and a plurality of radially arranged support frames are used to fix the exhaust pipe 23. One end of the support frame structure is sleeved on the exhaust pipe 23, and the support leg at the other end is fixed to the inner wall of the transition section 12 by welding or bolting, providing stable support for the exhaust pipe 23.

[0078] In one embodiment, a radial droplet separator 24 is disposed on the exhaust pipe 23 .

[0079] The radial droplet separator 24 is installed on the exhaust pipe 23 to separate the liquid and gas in the exhaust pipe 23 to prevent liquid droplets from causing short circuits, corrosion and fouling to the electrical equipment in the single pile section 11, such as the exhaust member 21, leading to damage to the electrical equipment.

[0080] Furthermore, the radial droplet separator 24 and the air extraction member 21 are both equipped with a drainage system, which can discharge the condensed water formed during the operation of the exhaust system to the bottom of the airtight platform 13 .

[0081] In one embodiment, a transition platform 14 is disposed in the transition section 12 , and a timing controller is disposed on the transition platform 14 . The timing controller is connected to the air extraction component 21 .

[0082] Specifically, the timing controller is preferably a clock, which is connected to the exhaust member 21, and starts the exhaust member 21 to exhaust hydrogen at a certain time interval. The exhaust member 21 is controlled by the timing controller, and the exhaust member 21 is opened and closed at a fixed time, which saves energy and has strong stability.

[0083] In one embodiment, the air extraction member 21 is a fan, and an air flow switch 25 is disposed inside the fan.

[0084] The exhaust member 21 is preferably a fan, and an explosion-proof fan can be used to extract hydrogen inside the single pile segment 11 to prevent the hydrogen volume concentration inside the single pile segment 11 from being too high, causing safety hazards.

[0085] Furthermore, since the hydrogen generation rates in the single pile foundation are different, that is, the hydrogen volume concentrations are different, the ventilation volume of the required fan can be determined by calculation.

[0086] Specifically, the fan air volume calculation process is as follows:

[0087] (1) The volume of gas between the water surface and the airtight platform 13 is:

[0088]

[0089] In the formula is the height of the airtight platform 13 from the water surface, and d is the diameter of the single pile section 11 at the water surface.

[0090] According to the ventilation frequency of 6 times / h, the fan ventilation capacity is ;

[0091] (2) The upper limit of hydrogen concentration is 1 / 4 of the lower explosion limit of hydrogen concentration. In this embodiment, the lower explosion limit of hydrogen concentration is 4%. =1%, then the fan air volume is calculated according to the upper limit of hydrogen concentration control:

[0092]

[0093] The ventilation volume of the fan is selected according to the larger value calculated by the above two calculation methods to ensure that the ventilation system can meet safety requirements.

[0094] In one embodiment, an air flow switch 25 is provided inside the fan.

[0095] The airflow switch 25 is used to monitor the operation of the fan in real time, so as to detect and eliminate faults in time.

[0096] The design method of the offshore wind turbine monopile foundation hydrogen discharge system provided in this embodiment is described as follows:

[0097] Firstly, the volume concentration of hydrogen in the single pile foundation is calculated by using parameters such as the cross-sectional radius of the single pile section 11 at the high tide level 15, the cross-sectional radius of the single pile section 11 at the low tide level 16, and the hydrogen generation rate.

[0098] If the volume concentration of hydrogen is less than the safety threshold value of 4% of the volume concentration of hydrogen, there is no need to set the exhaust part 21, and the hydrogen can be discharged by natural ventilation through the exhaust system. Specifically, as the tide rises and falls, the water level in the single pile section 11 of the single pile foundation will change periodically between the high tide level 15 and the low tide level 16. In the process of rising from the low tide level 16 to the high tide level 15, the volume space of the gas in the single pile foundation gradually becomes smaller, and the hydrogen can be discharged from the single pile foundation through the exhaust port 22 and the exhaust pipe 23 to achieve hydrogen discharge; in the process of falling from the high tide level 15 to the low tide level 16, the volume space of the gas in the single pile foundation gradually becomes larger, and natural air will be added through the exhaust port 22 and the exhaust pipe 23, so that natural hydrogen discharge and ventilation can be achieved with periodic changes with the tide.

[0099] If the hydrogen volume concentration is greater than or equal to the hydrogen volume concentration safety threshold, it is necessary to set a vacuum component 21 in the exhaust pipe 23, and start the vacuum component 21 at a set time interval through a timing controller to extract the hydrogen in the single pile section 11 through the vacuum component 21.

[0100] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A design method for a hydrogen discharge system of a monopile foundation of an offshore wind turbine, which is applied to hydrogen discharge of a monopile foundation of an offshore wind turbine, wherein the monopile foundation comprises: A single pile section (11) and a transition section (12), wherein the transition section (12) is arranged on the single pile section (11), and an airtight platform (13) is arranged below the connection between the single pile section (11) and the transition section (12), characterized in that the hydrogen discharge system design method comprises the following steps: The hydrogen volume concentration in the single pile foundation is calculated by the formula Calculated, where C is the volume concentration of hydrogen, is the hydrogen production rate, is the rate of air change caused by tidal changes; ,in is the volume difference between high and low tide levels, ,in is the cross-sectional radius of the monopile section (11) at the high tide level (15), is the cross-sectional radius of the monopile section (11) at the low tide level (16); When the hydrogen volume concentration is less than the hydrogen volume concentration safety threshold, the hydrogen is discharged from the interior of the single pile foundation in a natural ventilation manner through the exhaust system as the tide rises and falls; when the hydrogen volume concentration is greater than or equal to the hydrogen volume concentration safety threshold, an exhaust component (21) is provided in the exhaust system to extract the hydrogen in the single pile foundation through the exhaust component (21).

2. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to claim 1, characterized in that: The hydrogen volume concentration safety threshold is less than or equal to the hydrogen volume concentration lower explosion limit.

3. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to claim 1, characterized in that: The exhaust system comprises: an exhaust port (22) and an exhaust pipe (23); the exhaust port (22) is arranged on the single pile section (11) and is located below the airtight platform (13); the exhaust pipe (23) is arranged on the inner wall of the single pile foundation, and the exhaust end (231) of the exhaust pipe (23) extends to the outside of the transition section (12); and the air extraction member (21) is arranged on the exhaust pipe (23).

4. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to claim 3, characterized in that: The single pile section (11) is provided with two exhaust ports (22), and the two exhaust ports (22) are arranged opposite to each other.

5. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to claim 3, characterized in that: The airtight platform (13) is provided with an air hole, and the air inlet end (232) of the exhaust pipe (23) is connected to the air hole.

6. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to claim 3, characterized in that: A radial droplet separator (24) is provided on the exhaust pipe (23).

7. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to any one of claims 1 to 6, characterized in that: A transition platform (14) is provided in the transition section (12), a timing controller is provided on the transition platform (14), and the timing controller is connected to the air extraction component (21).

8. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to any one of claims 1 to 6, characterized in that: The air extraction component (21) is a fan.

9. The method for designing a hydrogen discharge system for a monopile foundation of an offshore wind turbine according to claim 8, characterized in that: An air flow switch (25) is arranged inside the fan.

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