Floating body type offshore wind power station including propulsion device equipped with hydrogen plant

Abstract

To provide a floating body type offshore wind power station with no necessity for a chain or a wire rope, etc., to retain the offshore wind power station to sea bottom, to have the floating body type offshore wind power station retained in the same place offshore by utilizing a propulsion device by power generated in the wind power station, as well as being capable of storing hydrogen generated by electrolysis of water.SOLUTION: A floating body type offshore wind power generation station is provided composed to self propel a propulsion device by power generated in the floating body type offshore wind power generation device by; constructing a tower unit arranged offshore and a buoyancy body unit arranged underwater by reinforced concrete structure; coupling the tower unit and the floating body unit by a plurality of pieces of support rods; installing a water electrolysis device and a hydrogen liquefaction device for generating hydrogen by electrolysis of water by electricity generated in the floating type offshore wind power generation station in a housing of the tower unit; attaching a liquid hydrogen storage tank inside the floating body unit; and furthermore attaching the propulsion device to the floating body unit.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a floating offshore wind power plant configured to generate hydrogen by electrolyzing water with an electrolyzer using electricity generated by wind power generation and to be capable of self-propulsion by a propulsion device.

Background Art

[0002] In recent years, with the increasing use of renewable energy, the ocean has no obstacles blocking the wind, and the wind direction and wind speed are constant and do not change, so it is expected that stable power can be obtained. Currently, the structure of the offshore wind power generation devices that have been put into practical use is the same as that of the devices operating on land. Since there are fewer restrictions on installation in the ocean compared to the ground, it is considered that the installation in the ocean will increase in the future.

[0003] Currently, in the case of the bottom-fixed offshore wind power generation where the support reaches the seabed and is spreading in Europe and other places, it is suitable for relatively shallow water areas with a water depth of about 50 m. However, in the case of Japan, since the area of the continental shelf with a relatively shallow water depth is small, in Japan, the wind power generation device is being shifted to a floating type that floats on the ocean and maintains its position by being moored to the seabed with a chain, wire rope, etc. This is the current situation.

[0004] A floating offshore wind power generation device is composed of a floating body part arranged in water and a tower part erected on the floating body part, and includes a wind power generation device composed of a nacelle and blades at the top of the tower part, and maintains the position of the floating offshore wind power plant by being moored to the seabed with a chain, wire rope, etc. By configuring in this way, it is possible to install a floating offshore wind power generation device even in a sea area with a water depth of about 200 m. Currently, the floating offshore wind power technologies that have been put into practical use mainly include four types: spar type, semi-submersible type, barge type, and TLP type.

[0005] Conventionally, in order to install a floating type offshore wind power generation device at a specified sea area location, after towing and mooring the floating body to the installation sea area by a mother ship or the like, it was moored to the seabed by a chain, a wire rope, etc., and the upper structure was moved to the upper end of the floating body by a crane ship or the like, and the floating body and the upper structure were connected.

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in sea areas with a water depth of 50 m or more where floating type offshore wind power plants are installed, the sea state conditions are often more severe than those in sea areas where general ocean engineering is carried out. The installation work of floating type offshore wind power plants has to be carried out taking into account relatively calm sea state periods under severe sea state conditions, so there is a problem that the implementation time and period of the installation work are limited.

[0007] Furthermore, the installation of floating type offshore wind power generation devices requires delicate work using large work vessels, so there is also a problem of increasing construction costs.

[0008] Furthermore, in the coastal waters of Japan, sea areas with a water depth of about 50 m to 200 m are narrow and limited, so the sea areas where floating type offshore wind power generation devices can be installed are also limited.

[0009] In view of the above situation, an object of the present invention is to provide a floating type offshore wind power plant that eliminates the need for a chain, a wire rope, etc. for mooring the floating type offshore wind power generation device to the seabed, operates a propulsion device with the electricity generated by the wind power generation device to keep the floating type offshore wind power generation device staying at the same location offshore, and stores hydrogen generated by electrolyzing seawater.

Means for Solving the Problems

[0010] In order to solve such problems, the invention according to claim 1 is a floating offshore wind power plant composed of a tower that supports a nacelle incorporating a plurality of blades, a speed increaser, and a generator. In this floating offshore wind power plant, a tower part arranged on the sea and a buoyancy body part arranged underwater are constructed with a reinforced concrete structure, and the tower part and the buoyancy body part are connected by a plurality of columns. Inside the building of the tower part, a water electrolysis device and a hydrogen liquefaction device that electrolyze water with electricity generated by the floating offshore wind power plant to generate hydrogen are installed. A liquid hydrogen storage tank is installed inside the buoyancy body part. Without mooring the floating offshore wind power plant to the seabed, a propulsion device is attached to the buoyancy body part, and the propulsion device is operated with electricity generated by the floating offshore wind power plant to be configured to be self-propelled.

[0011] The invention according to claim 2 is characterized in that, in addition to the structure according to claim 1, the propulsion device is composed of a 360-degree swivel pod propulsion device.

[0012] The invention according to claim 3 is characterized in that, in addition to the structure according to claim 1 or 2, the tower part is generally conical, the lower part is composed of a multi-story building, and the top part is formed in a planar circular shape.

[0013] The invention according to claim 4 is characterized in that, in addition to the structure according to any one of claims 1 to 3, the buoyancy body part is generally cylindrical and has a hollow interior. For floating a floating offshore wind power plant constructed on land near the sea on the water, the bottoms in both the front and rear directions are inclined toward the front end part and the rear end part.

[0014] The invention according to claim 5 is characterized in that, in addition to the structure according to any one of claims 1 to 4, a vertical hole partition penetrating from generally the upper end part inside the tower part to generally the lower end part of the buoyancy body part is constructed, and a simple lift and stairs for vertical movement are installed inside.

[0015] The invention according to claim 6, in addition to the structure according to any one of claims 1 to 5, installs an energy storage facility for storing electricity generated by the floating offshore wind power plant in the buoyancy body part, and installs a propulsion device at the lower part of the buoyancy body part to drive a screw propeller, so as to configure the floating offshore wind power plant to stay at the same location on the ocean.

Advantages of the Invention

[0016] According to the invention described in claim 1, in a floating offshore wind power plant composed of a tower that supports a nacelle incorporating a plurality of blades, a speed increaser, and a generator, the tower part arranged on the ocean and the buoyancy body part arranged underwater are constructed with a reinforced concrete structure, and the tower part and the buoyancy body part are connected by a plurality of struts. In the building of the tower part, a water electrolysis device and a hydrogen liquefaction device for electrolyzing water with electricity generated by the floating offshore wind power plant to generate hydrogen are installed, and a liquid hydrogen storage tank is installed inside the buoyancy body part. Without mooring the floating offshore wind power plant to the seabed, a propulsion device is attached to the buoyancy body part, and the propulsion device is operated with electricity generated by the floating offshore wind power plant to achieve self-navigation. By utilizing the technology cultivated at construction sites such as super high-rise buildings, the manufacturing days are significantly shortened. Hydrogen is generated by electrolyzing water with the electrical output obtained from the floating offshore wind power plant as a power source, and the propulsion device is operated with the generated electricity to enable it to stay at the same location.

[0017] According to the invention described in claim 2, since the propulsion device is composed of a 360-degree swivel pod propulsion device, it is possible to make the floating offshore wind power plant stay at the same location on the ocean.

[0018] According to the invention described in claim 3, since the tower part is generally conical and the lower part is composed of multiple floors of buildings and the top part is formed in a planar circular shape, it is possible to reduce the wind pressure on the tower part and suppress the sway of the tower part.

[0019] According to the invention described in claim 4, the buoyancy body part is generally cylindrical and has a hollow interior. In order to float a floating offshore wind power plant constructed on land near the sea on the water, by inclining both the front and rear bottoms towards the front end and the rear end, the water resistance is reduced and it becomes possible to float on the water in a stable state.

[0020] According to the invention described in claim 5, a vertical hole partition is constructed that penetrates from approximately the upper end inside the tower part to approximately the lower end of the buoyancy body part, and a simple lift and stairs for vertical movement are installed inside, so that it becomes possible to significantly reduce the labor for maintenance workers.

[0021] According to the invention described in claim 6, an energy storage facility for storing the electricity generated by the floating offshore wind power plant is installed in the buoyancy body part, and a propulsion device is attached to the lower part of the buoyancy body part to drive a screw propeller, so that the floating offshore wind power plant is configured to stay in the same location on the sea. As a result, it becomes possible to omit facilities such as chains and wire ropes for mooring the floating offshore wind power plant to the seabed.

Embodiment 1

[0022] Hereinafter, Embodiment 1 of this invention will be described. [Embodiment 1 of the Invention]

[0023] Figs. 1 to 5 show Embodiment 1 of this invention.

[0024] FIG. 1 shows in perspective view a floating offshore wind power plant 1 with a propulsion device, which is installed in the ocean and incorporates a hydrogen plant according to the present invention. The floating offshore wind power plant 1 with a propulsion device incorporating a hydrogen plant includes three blades 2 attached to a hub 10, a speed increaser, a generator, a yaw control device, etc. installed inside a nacelle 3, a steel pipe 11 for attaching the nacelle 3 to a tower section 4, a tower section 4 constructed of a reinforced concrete structure, and eight struts 6 formed of steel pipes with a diameter of about 2 m, a wall thickness of about 30 mm, and a length of about 10 m for connecting the tower section 4 and a buoyancy body section 8. Further, the floating offshore wind power plant 1 with a propulsion device incorporating a hydrogen plant is floated and made self-supporting on the ocean, and is composed of a buoyancy body section 8 formed of a reinforced concrete structure with a hollow interior to serve as a floating structure section. Inside the buoyancy body section 8, a plurality of ballast water tanks (not shown) are installed so that the floating offshore wind power plant 1 with a propulsion device incorporating a hydrogen plant maintains a horizontal state with respect to the sea surface 7 and does not capsize at the same time. By injecting or discharging seawater into or from the ballast water tanks, the buoyancy of the buoyancy body section 8 is adjusted so that the position of the sea surface 7 is approximately at the vertical center of the struts 6, and the inclination of the floating offshore wind power plant 1 with a propulsion device incorporating a hydrogen plant with respect to the sea surface 7 is also adjusted by injecting or discharging seawater into or from a plurality of ballast water tanks so that the floating offshore wind power plant 1 with a propulsion device incorporating a hydrogen plant can maintain a horizontal state with respect to the sea surface 7. Further, in order to convert seawater into fresh water using the electricity generated by the generator inside the nacelle 3, a seawater desalination device 58 installed inside a building 3 is operated as shown in the front view of FIG. 3b. Further, the fresh water is electrolyzed by a water electrolysis device 53 to generate hydrogen, and in order to operate the propulsion device 12 shown in FIG. 3b in a stable state at all times, the electricity generated by the generator inside the nacelle 3 is stored in a battery facility 59 installed inside the buoyancy body section 8, and then the propulsion device 12 is operated. Note that inside the nacelle 3, in order to improve the power generation efficiency, a yaw drive device (not shown) is attached so that it can be rotated 360 degrees with respect to a steel pipe 23 to perform azimuth control so that the blades 2 are always facing directly into the wind direction.

[0025] Figure 2 shows a front view of the floating offshore wind power plant 1 with a propulsion device equipped with a hydrogen plant described in Figure 1. In the present invention, in order to always supply stable power to the propulsion device 12, the electricity generated by the floating offshore wind power plant 1 with a propulsion device equipped with a hydrogen plant is stored in a battery facility 59 (not shown) installed inside the buoyancy body 8, and then the propulsion device 12 is driven by the electricity supplied from the battery facility 59. Thus, even in a state where the blade 2 does not rotate and the generator does not generate electricity in a windless state, the power of the battery facility 59 is utilized to configure the floating offshore wind power plant 1 with a propulsion device equipped with a hydrogen plant so that it can stay at the same location on the sea surface 7. The propulsion device 12 in the present invention has two 360-degree swivel pod propulsion devices 15 that can generate thrust almost evenly in all 360-degree directions, which are mounted side by side at approximately the center lower part of the buoyancy body 8. By separately operating and driving the rotation speeds and swivel angles of the two 360-degree swivel pod propulsion devices 15, the floating offshore wind power plant 1 with a propulsion device equipped with a hydrogen plant can be turned in the front-rear, left-right directions, and the floating offshore wind power plant 1 with a propulsion device equipped with a hydrogen plant can be made to stay at the same location on the sea surface 7.

[0026] FIG. 3 shows the tower part 4, the support column 6, the buoyancy body part 8, and the propulsion device 12 described in FIGS. 1 and 2 in a plan view of FIG. 3a and a front view of FIG. 3b. The tower part 4 is constructed of a reinforced concrete structure generally in a conical shape. As shown in FIG. 5, the upper diameter A of the tower part is formed into a circular shape with a diameter of about 5 m, the upper slab thickness B of the tower part is about 500 mm, the tower height C of the tower part 4 from the top 33 of the tower part to the bottom 39 of the tower is about 97 m, the bottom slab thickness D of the tower base 40 of the tower part 4 that constitutes the tower base of the tower part 4 is about 1 m, the tower base diameter S of the tower base 40 that constitutes the tower base is formed in a circular shape with a diameter of about 25 m. A building 5 with a four-story structure (shown as the first floor 38 of the building, the second floor 37 of the building, the third floor 36 of the building, and the fourth floor 35 of the building) with each floor height being about 5 m is constructed at the lower part of the tower part 4. The buoyancy body part 8 is generally formed in a cylindrical shape and serves as a floating body for floating the floating offshore wind power plant 1 with a propulsion device and a hydrogen factory on the sea. The inside is formed as a cavity and is constructed so that the center of the upper surface of the buoyancy body part 8 and the center of the tower part 4 are in a straight line. Further, as shown in FIG. 5, the buoyancy body part 8 is generally formed in a cylindrical shape, the diameter N of the buoyancy body part is about 100 m, and the height J of the buoyancy body part excluding the front inclined part 31 and the rear inclined part 32 of the buoyancy body part 8 is formed to be about 10 m. Further, as shown in FIG. 3, in order to float the floating offshore wind power plant 1 with a propulsion device and a hydrogen factory constructed on land stably on the water in the front and rear of the bottom surface of the buoyancy body part 8, both the front and rear bottoms in both the front and rear directions are inclined at an angle of about 14 degrees as shown by the front inclined part 31 (the boundary between the bottom surface and the rear inclined part 31 is shown by the dashed-dotted line (A) 29 in FIG. 3a) and the rear inclined part 32 (the boundary between the bottom surface and the rear inclined part 32 is shown by the dashed-dotted line (B) 30 in FIG. 3a) toward the front end and the rear end, as shown by the front inclined part angle M and the rear inclined part angle R in FIG. 5. Further, in order to connect the tower part 4 and the buoyancy body part 8, a state is shown in which eight support columns 6 formed of steel pipes with a diameter of about 2 m, a wall thickness of about 30 mm, and a length of about 10 m are attached at equal angles to the circumference at an equal distance from the center of the upper surface of the buoyancy body part 8.As described with reference to FIG. 1, a plurality of ballast water tanks (not shown) are installed inside the buoyancy body portion 8, and by injecting or discharging seawater into or from the ballast water tanks, the buoyancy of the buoyancy body portion 8 is adjusted so that the position of the sea surface 7 described in FIG. 2 is approximately at the vertical center of the support column 6. At the same time, the inclination of the floating type offshore wind power generation plant 1 with a propulsion device having a hydrogen factory installed thereon with respect to the sea surface 7 is also configured to maintain a horizontal state with respect to the sea surface 7 described in FIG. 2 by injecting or discharging seawater into or from a plurality of ballast water tanks.

[0027] Furthermore, a vertical hole section 34 is constructed from approximately the top portion 33 of the tower section 4 through the tower base 40 to approximately the bottom of the center portion of the buoyancy body portion 8, and is formed in a cylindrical shape with an approximate diameter of 4 m as shown by the dashed-dotted line (C) 41. Further, a staircase (not shown) for vertical movement and a simple lift (not shown) for inspection work are installed inside the vertical hole section 34, enabling workers to efficiently perform inspections.

[0028] Inside the building 5 of the tower section 4 configured as described above, a seawater desalination device 58 for converting seawater into fresh water, a water electrolysis device 53, and a hydrogen liquefaction device 54 are installed. The fresh water generated by the seawater desalination device 58 is electrolyzed by the electricity generated by the generator inside the nacelle 3 to generate hydrogen in the water electrolysis device 53, and further, the hydrogen liquefaction device 54 for liquefying the electrolyzed hydrogen is operated to produce liquid hydrogen from seawater, and the produced liquid hydrogen is configured to be stored in a liquid hydrogen storage tank 57 inside a cold box installed inside the buoyancy body portion 8 via the vertical hole section 34. By configuring in this way, it becomes possible to liquefy the volume of hydrogen generated by electrolysis into liquid hydrogen of approximately 1 / 800 and store it efficiently. The liquid hydrogen produced in this way is loaded onto a liquefied hydrogen carrier ship and transferred.

[0029] Figure 4 shows the support columns 6 and the buoyancy body 8 described with reference to FIGS. 1 and 2 in a plan view of FIG. 4a and a front view of FIG. 4b. The eight support columns 6 are all formed of cylindrical steel pipes with a diameter of approximately 2 m, a wall thickness of 30 mm, and a length of 10 m. As shown in the plan view of FIG. 4a, they are vertically attached to positions radially extending at 45-degree intervals when viewed horizontally on a circumference with a radius of approximately 1050 cm from the center of the upper surface of the buoyancy body 6. The centers of the eight support columns (A) 45, support column (B) 46, support column (C) 47, support column (D) 48, support column (E) 49, support column (F) 50, support column (G) 51, and support column (H) 52 are located at these positions. The attachment positions of the upper parts of the eight support columns (A) 45, support column (B) 46, support column (C) 47, support column (D) 48, support column (E) 49, support column (F) 50, support column (G) 51, and support column (H) 52 to the tower base 40 are attached to the lower surface of the tower base 40 where the center of the lower surface of the tower bottom 39 described in FIG. 3 and the center of the buoyancy body 8 are aligned in a straight line. The reason for connecting the tower part 4 and the buoyancy body 8 with the eight support columns 6 is to minimize the resistance caused by the undulation of the sea waves by supporting the tower part 4 with the cylindrical support columns 6 with a round diameter of approximately 2 m, suppress the sway of the floating-type offshore wind power plant 1 with a propulsion device equipped with a hydrogen factory, and make the blades face the wind.

[0030] Figure 5 shows the dimensions and angles of the members of the tower section 4, the support columns 6, and the buoyancy body section 8 described in FIGS. 1 and 2, indicated by symbols A to S. The tower section 4 is generally conical, and the top section 33 is formed as a circular plane. The upper tower diameter A of the top section 33 is formed as a circle with a diameter of approximately 5 m. Further, the upper tower slab thickness B of the top section 33 is formed to be approximately 500 mm. Further, as shown by the dashed-dotted line (C) 41, the vertical hole section 34 penetrates from approximately the upper end of the tower section 33 through the tower base 40 to approximately the lower end of the buoyancy body section 8, and is formed as a cylindrical shape with an internal diameter of approximately 4 m and a height of approximately 116.3 m. Further, the tower height C of the tower section 4 from the top section 33 to the tower bottom 39 is formed to be approximately 97 m. Further, for the four-story building 5, the height F of the fourth floor of the building is approximately 5 m, the height G of the third floor of the building is approximately 5 m, the height H of the second floor of the building is approximately 5 m, and the height I of the first floor of the building is approximately 5 m. Further, the tower bottom slab thickness D at the bottom of the tower section 4 is formed to be approximately 1 m, and the tower base diameter T at the lower part of the tower section 4 is formed as a cylindrical shape with a diameter of approximately 25 m. Further, the heights E of all eight support columns 6 are all formed to be approximately 10 m. Further, the thickness of the reinforced concrete of the buoyancy body section 8 constructed with a hollow interior in a reinforced concrete structure is formed to be approximately 200 mm for both the upper part, the lower part, and the outer peripheral surface. Further, a hole with a diameter of approximately 4 m is formed at the center of the upper part of the buoyancy body section 8 to penetrate the vertical hole section 34. Further, the front and rear bottoms of the buoyancy body section 8 are formed in a shape inclined forward and backward. Further, the buoyancy body diameter N of the buoyancy body section 8 is formed as a cylindrical shape with a diameter of approximately 100 m. Further, the buoyancy body height J excluding the front inclined part 31 and the rear inclined part 32 of the buoyancy body section 8 described in FIG. 3 is formed to be approximately 10 m. Further, the front inclined part tip height K at the tip of both the front inclined part 31 and the rear inclined part 32 in the front and rear directions of the buoyancy body section 8 described in FIG. 3, and the rear inclined part rear end height R are both formed to be approximately 3 m. Further, the front inclined part angle M and the rear inclined part angle P of the front inclined part 31 and the rear inclined part 32 described in FIG. 3 are both formed to be approximately 14 degrees. The front inclined part maximum width L of the front inclined part 31 described in FIG. 3 and, similarly, the rear inclined part maximum width Q of the rear inclined part 32 are both formed to be approximately 12 m.

Embodiment 2

[0031] Hereinafter, Embodiment 2 of the present invention will be described. [Embodiment 2 of the Invention]

[0032] FIG. 6 shows Embodiment 2 of the present invention. In Embodiment 1 of the above invention, two 360-degree swivel pod propulsion devices 15 were horizontally attached to approximately the center lower part of the buoyant body part 8, whereas in Embodiment 2 of the present invention, two propulsion devices 69 (specifically, 360-degree swivel pod propulsion devices 70) are arranged in parallel and attached to approximately the rear end of the buoyant body part 66, and by controlling by changing the rotation speed and swivel angle of the two propulsion devices 69 (specifically, 360-degree swivel pod propulsion devices 70), the floating offshore wind power generation plant 1 with a propulsion device equipped with a hydrogen factory of the present invention can be configured to be stationary at the same offshore location. Regarding other structures, they are the same as those in Embodiment 1 of the present invention.

[0033] As described above, based on the embodiments, the floating offshore wind power generation plant with a propulsion device equipped with a hydrogen factory according to the present invention has been described in detail. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention, and of course, it belongs to the technical scope of the present invention.

[0034] In FIG. 1, it was described that the support column 6 was formed of a steel pipe with a diameter of about 2 m, a wall thickness of about 30 mm, and a length of about 10 m. However, it is of course possible to form the support column 6 with a reinforced concrete structure having a cylindrical shape with a diameter of about 2 m, a cylinder thickness of about 20 cm, and a length of about 10 m.

Brief Explanation of Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Explanation of Reference Numerals

[0036] A Upper diameter of the tower section B Thickness of the upper slab of the tower section C Height of the tower section D Thickness of the bottom slab of the tower E Height of the support column F Height of the fourth floor of the building G Height of the third floor of the building H Height of the second floor of the building I Height of the first floor of the building J Height of the buoyancy body section K Height of the tip of the front inclined section L Maximum width of the front inclined section M Angle of the front inclined section N Diameter of the buoyancy body section P Angle of the rear inclined section Q Maximum width of the rear inclined section R Height of the rear end of the rear inclined section S Diameter of the tower base 1 Floating offshore wind power plant with a propulsion device co-located with a hydrogen factory 2 Blade 3 Nacelle 4 Tower section 5 Building 6 Support column 7 Sea surface 8 Buoyancy body section 9 Seabed 10 Hub 11 Steel pipe 12 Propulsion device 13 Screw propeller 15 360-degree swiveling pod propulsion device 29 Dashed line (A) 30 Dashed line (B) 31 Front inclined section 32 Rear inclined section 33 Top part 34 Vertical hole section 35 Building, 4th floor 36 Building, 3rd floor 37 Building, 2nd floor 38 Building, 1st floor 39 Tower bottom 40 Tower base 41 Dashed line (C) 45 Support column (A) 46 Support column (B) 47 Support column (C) 48 Support column (D) 49 Support column (E) 50 Support column (F) 51 Support column (G) 52 Support column (H) 53 Water electrolysis device 54 Hydrogen liquefaction device 55 Dashed line (E) 56 Dashed line (D) 57 Liquid hydrogen storage tank 58 Seawater desalination device 59 Battery equipment 60 Tower part 61 Top part 62 Dashed line 63 Vertical hole section 64 Building 65 Support column 66 Buoyancy body part 67 Screw propeller 68 Rudder 69 Propulsion device 70 360-degree swivel pod propulsion device

Claims

1. In a floating offshore wind power plant composed of a tower that supports a nacelle incorporating a plurality of blades, a speed increaser, and a generator, a tower section disposed on the sea and a buoyancy body section disposed underwater are constructed of a reinforced concrete structure, and the tower section and the buoyancy body section are connected by a plurality of columns, a water electrolysis device and a hydrogen liquefaction device for electrolyzing water with electricity generated by the floating offshore wind power plant to produce hydrogen are installed in the building of the tower section, a liquid hydrogen storage tank is installed inside the buoyancy body section, A floating offshore wind power plant with a propulsion device equipped with a hydrogen plant, characterized in that a propulsion device is attached to the buoyancy body section without mooring the floating offshore wind power plant to the seabed, and the propulsion device is operated with electricity generated by the floating offshore wind power plant to achieve self-propulsion.

2. The floating offshore wind power plant with a propulsion device equipped with a hydrogen plant according to claim 1, characterized in that the propulsion device is composed of a 360-degree swivel pod propulsion device.

3. The floating offshore wind power plant with a propulsion device equipped with a hydrogen plant according to claim 1 or 2, characterized in that the tower section is generally conical, with the lower part composed of a multi-story building and the top part formed in a planar circular shape.

4. The floating offshore wind power plant with a propulsion device equipped with a hydrogen plant according to any one of claims 1 to 3, characterized in that the buoyancy body section is generally cylindrical with a hollow interior, and in order to float a floating offshore wind power plant constructed on land near the sea on the water, the bottoms in both the forward and rearward directions are inclined toward the front end and the rear end.

5. The floating offshore wind power plant with a propulsion device equipped with a hydrogen plant according to any one of claims 1 to 4, characterized in that a vertical hole partition is constructed to penetrate from generally the upper end inside the tower section to generally the lower end of the buoyancy body section, and a simple lift and stairs for vertical movement are installed inside.

6. The floating offshore wind power plant with a propulsion device equipped with a hydrogen plant according to any one of claims 1 to 5, characterized in that a power storage facility for storing electricity generated by the floating offshore wind power plant is installed in the buoyancy body section, and a propulsion device is attached to the lower part of the buoyancy body section to drive a screw propeller, so that the floating offshore wind power plant is configured to stay at the same location on the sea.

Images