JP2025094867A - Floating offshore wind power plant with hydrogen plant - Google Patents

Abstract

To significantly shorten the number of days for construction and to provide a water electrolysis device for generating hydrogen by carrying out electrolysis on sea water with electrical output obtained at a floating body type offshore wind power station as a power source inside the floating body type offshore wind power station, and the floating body type offshore wind power station installed with a storage facility for the generated hydrogen.SOLUTION: A construction period is significantly shortened by building a facility for constructing a floating body type offshore wind power station on a coast near the ocean where the floating type offshore wind power station is to be installed, constructing the floating type offshore wind power station by making use of technology cultivated by construction work for a skyscraper etc., floating the floating body type offshore wind power station assembled on land on water, and having a tugboat (tow boat) tow to site, and thereby an effective construction method on land is provided, as well as there are provided a water electrolysis device for generating hydrogen by carrying out electrolysis on sea water with the power generated by the floating body type offshore wind power station as a power source inside the floating body type offshore wind power station, and the floating body type offshore wind power station installed with a hydrogen storage facility for storing the generated hydrogen.SELECTED DRAWING: Figure 2

Description

The present invention relates to a floating offshore wind power plant having a reinforced concrete structure equipped with a water electrolysis device and a liquid hydrogen storage facility.

In recent years, with the increase in the use of renewable energy, it is expected that a stable supply of electricity can be obtained offshore, as there are no obstacles that block the wind and the wind direction and speed are constant and do not change.
The structure of offshore wind turbines currently in practical use is similar to that of devices operating on land, and because there are fewer constraints on installing wind turbines offshore than on land, it is expected that more will be installed offshore in the future.

Currently, fixed-bottom wind turbines, which are popular in Europe and other regions, have columns that reach the seabed, and are suitable for relatively shallow waters of up to about 50 meters deep. However, in Japan, the area of the continental shelf where the waters are relatively shallow is small, so the current situation is that the country is moving toward floating wind turbines, in which wind turbines are floated on the ocean and kept in position by being moored to the seabed with chains, wire ropes, etc.

A floating offshore wind turbine is composed of a float placed underwater and a tower erected on the float, with a wind turbine consisting of a nacelle and blades attached to the top of the tower.
Currently, there are four main types of floating offshore wind technologies in use: spar type, semi-submersible type, barge type, and total load platform (TLP) type.

Currently, there is a demand for greater output per unit, which requires longer blades to increase the wind-receiving surface area of the wind turbine body. Large offshore wind turbines with blades longer than 80 m are now being put into practical use.

Conventionally, in order to install a floating offshore wind power generation device in a designated sea area, the float was towed to the installation area by a barge or the like and moored there, and then the superstructure was moved to the upper end of the float by a crane ship or the like, and the float and the superstructure were connected to each other.

In recent years, a type of renewable energy known as "green hydrogen" has been attracting attention. It is produced by using electricity generated by solar or wind power to electrolyze water and separate it into hydrogen and oxygen.
Currently, electricity generated by offshore wind power generation facilities is sent to hydrogen production plants via undersea power transmission cables laid on the seabed, and hydrogen is produced from water using water electrolysis equipment. This necessitates the construction of new power transmission facilities on the seabed, which results in large-scale construction work and enormous installation costs, preventing the widespread use of this technology.

However, sea areas with a depth of 50 m or more where floating offshore wind power generation devices are installed often have harsher oceanographic conditions than sea areas where general marine construction work is carried out, and installation work for floating offshore wind power generation devices must be carried out under harsh oceanographic conditions only during periods when the oceanographic conditions are relatively calm, which poses the problem of limiting the timing and duration of installation work.

Furthermore, the installation of floating offshore wind turbines requires delicate work using large workboats, which increases construction costs.

Furthermore, in order to produce "green hydrogen" using electricity generated by floating offshore wind turbines, there was also the issue that an undersea power transmission cable would have to be laid on the seabed to transmit the electricity to the hydrogen production plant.

In view of the above current situation, the present invention aims to provide an efficient construction method on land by constructing facilities for constructing a floating offshore wind farm on a coast close to the sea where the floating offshore wind farm will be installed, constructing the floating offshore wind farm using technology cultivated in the construction work of skyscrapers and the like, and floating the floating offshore wind farm assembled on land onto the water and towing it to the site with a tugboat, thereby significantly shortening the number of construction days and providing an efficient construction method on land, and to efficiently produce green hydrogen by installing a water electrolysis device inside the floating offshore wind farm for producing hydrogen by electrolyzing seawater using electricity generated by the floating offshore wind farm as a power source, and a liquid hydrogen storage facility for storing the produced hydrogen.

In order to solve such problems, the invention described in claim 1 provides a floating offshore wind turbine composed of a tower supporting a nacelle incorporating a number of blades and a gearbox and a generator, wherein the tower section placed on the ocean and the buoyant body section placed underwater are constructed of reinforced concrete structures, the tower section and the buoyant body section are connected by a number of pillars and the buoyant body section is moored to a number of seabed foundation piles fixed to the seabed by a number of mooring wires, a water electrolysis device that electrolyzes water using electricity generated by the floating offshore wind turbine to produce hydrogen is installed inside the tower section, and a liquid hydrogen storage tank for storing the hydrogen produced by the water electrolysis device is installed in the buoyant body section.

The invention described in claim 2 is characterized in that, in addition to the structure described in claim 1, the tower section is roughly conical in shape, the lower part is composed of a multi-story building, the top part is formed with a circular flat surface, and a steel pipe for mounting a nacelle is attached to the top part.

The invention described in claim 3 is characterized in that, in addition to the structure described in claim 1 or 2, the buoyancy body portion is generally cylindrical and hollow inside, and the bottoms in both the forward and rearward directions are inclined toward the front end and rear end in order to float a floating offshore wind power plant constructed on land near the sea on the water.

The invention described in claim 4 is characterized in that, in addition to the structure described in any one of claims 1 to 3, the buoyant body section is moored by a plurality of mooring wires connected to a plurality of seabed foundation piles installed on the seabed using a TLP type mooring system, and one end of the plurality of mooring wires that pass through mooring wire guide holes formed on the side of the buoyant body section are pulled into the building of the tower section via a plurality of wire pulleys, and the horizontal state of the floating offshore wind farm is maintained by adjusting the individual lengths of the mooring wires with a wire winding/letting out machine.

The invention described in claim 5 is characterized in that, in addition to the structure described in any one of claims 1 to 4, a vertical compartment is constructed that extends from approximately the upper end of the tower section to approximately the lower end of the buoyancy body section, and a simple lift and a staircase for vertical movement are installed inside the vertical compartment.

The invention described in claim 6 is characterized in that, in addition to the structure described in any one of claims 1 to 5, a hydrogen liquefaction device for liquefying hydrogen produced by the water electrolysis device is installed inside the building of the tower section.

According to the invention described in claim 1, in a floating offshore wind turbine composed of a tower supporting a nacelle incorporating a plurality of blades and a gearbox and a generator, the tower section placed on the ocean and the buoyant body section placed underwater are constructed of a reinforced concrete structure, the tower section and the buoyant body section are connected by a plurality of pillars, and the buoyant body section is moored to a plurality of seabed foundation piles fixed to the seabed by a plurality of mooring wires, a water electrolysis device that electrolyzes water using electricity generated by the floating offshore wind turbine to produce hydrogen is installed inside the tower section, and a liquid hydrogen storage tank for storing the hydrogen produced by the water electrolysis device is installed in the buoyant body section. This makes it possible to significantly shorten the number of days required for construction by utilizing technology cultivated at construction sites for skyscrapers and the like, and to directly produce hydrogen by electrolyzing seawater using the electrical output obtained from the floating offshore wind turbine as a power source.

According to the invention described in claim 2, the tower section is roughly conical in shape, with the lower part being composed of a multi-story building, and the top part being formed into a circular plane. By attaching a steel pipe for mounting a nacelle to the top part, it is possible to reduce the wind pressure on the tower section.

According to the invention described in claim 3, the buoyancy body portion 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 rear end, thereby reducing water resistance and making it possible to float it on the water in a stably state.

According to the invention described in claim 4, the buoyant body section is connected to a plurality of seabed foundation piles installed on the seabed with a plurality of mooring wires and moored using a TLP type mooring system, and one end of the plurality of mooring wires, which are passed through guide holes for the mooring wires formed on the side of the buoyant body section, are pulled into the building of the tower section via a plurality of wire pulleys, and the horizontal state of the floating offshore wind farm is maintained by adjusting the individual lengths of the mooring wires with a wire winding/letting out machine.This makes it possible to easily maintain the horizontal state of the floating offshore wind farm by adjusting the length of each mooring wire.

According to the invention described in claim 5, by constructing a vertical compartment that extends from approximately the upper end of the tower section to approximately the lower end of the buoyancy body section, and installing a simple lift and a staircase for vertical movement inside the vertical compartment, it is possible to significantly reduce the labor required by workers to perform maintenance.

According to the invention recited in claim 6, a hydrogen liquefaction device for liquefying the hydrogen produced by the water electrolysis device is installed inside the tower building, making it possible to liquefy hydrogen using electricity generated by the floating offshore wind farm.

Hereinafter, an embodiment of the present invention will be described.

1 to 7 show an embodiment of the present invention.

1 is a perspective view showing a floating offshore wind power plant 1 with a hydrogen plant according to the present invention, installed on the ocean. The floating offshore wind power plant 1 with a hydrogen plant is composed of three blades 2 attached to a hub 10, a gearbox, a generator, a yaw control device, etc. installed inside a nacelle 3, a steel pipe 23 for fixing the nacelle 3 to a tower section 4, a tower section 4 constructed of a reinforced concrete structure, eight supports 6 made of steel pipes with a diameter of about 2 m, a thickness of about 30 mm, and a length of about 10 m for connecting the tower section 4 and a buoyancy body section 8, and a buoyancy body section 8 with a reinforced concrete structure and a hollow interior for floating the floating offshore wind power plant 1 with a hydrogen plant on the ocean and making it self-supporting, and for serving as a floating structure section. In order to minimize the amount of swaying of the buoyant body 8 configured in this manner, the buoyant body 8 is moored to the seabed 9 in a TLP type manner using six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16, and is fixed to the seabed 9 by six seabed foundation piles (A) 17, seabed foundation pile (B) 18, seabed foundation pile (C) 19, seabed foundation pile (D) 20, seabed foundation pile (E) 21, and seabed foundation pile (F) 22 to fix the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 to the seabed 9. Since the nacelle 3 attached to the steel pipe 23 needs to constantly follow the blades 2 in the direction of the wind, a yaw control device (not shown) is attached inside the nacelle 3 so that the blades 2 can be rotated freely 360 degrees relative to the steel pipe 23.

Fig. 2 shows a front view of the floating offshore wind power plant 1 with the hydrogen plant described in Fig. 1. In the present invention, in order to moor the floating offshore wind power plant 1 with the hydrogen plant to the seabed 9 in a TLP type, six mooring wires (A) 11, (B) 12, (C) 13, (D) 14, (E) 15, and (F) 16 are attached to six seabed foundation piles (A) 17, (B) 18, (C) 19, (D) 20, (E) 21, and (F) 22 installed on the seabed 9, respectively, and the sea surface 7 is positioned approximately at the center from top to bottom of the support 6. By individually adjusting the lengths of the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 so that the buoyancy body 8 is in a horizontal position relative to the sea surface 7 and forcibly submerging the buoyancy body 8 so that it remains horizontal relative to the sea surface 7, the floating offshore wind power plant 1 which also has a hydrogen factory attached can be maintained in a horizontal state with minimal vertical and horizontal swaying relative to the sea surface 7, and the blades 2 can be rotated in a stable state against the wind.

3 shows the tower section 4, the support column 6, and the buoyant body section 8 described in Fig. 1 and Fig. 2 in a plan view in Fig. 3a and a front view in Fig. 3b. The tower section 4 is constructed of a roughly conical reinforced concrete structure, the top section 33 is formed in a circle with a diameter of about 5 m as shown by the tower section top diameter A in Fig. 6, the tower section top slab thickness B is about 500 mm, the tower section height C from the top section 33 of the tower section 4 to the tower bottom 39 is about 97 m, the tower bottom slab thickness D constituting the tower section base 40 of the tower section 4 is about 1 m, the tower base diameter S constituting the tower section base 40 is a circle with a diameter of about 25 m, and a four-story building 5 (shown by the first building floor 38, the second building floor 37, the third building floor 36, and the fourth building floor 35) is constructed at the bottom of the tower section 4, with each floor having a height of about 5 m. The buoyant body section 8 is generally cylindrical and hollow inside in order to function as a float. As shown in FIG. 6, the buoyant body diameter N of the buoyant body section 8 is approximately 100 m, and the buoyant body height J is approximately 10 m. Furthermore, as shown in FIG. 3, in order to launch the floating offshore wind farm 1, which is equipped with a hydrogen plant constructed on land, in a stable state, the bottom of the buoyant body section 8 in both the forward and rearward directions is divided into a forward inclined section 31 (the boundary between the bottom and the forward inclined section 31 is shown by the dashed line (A) 41 in FIG. 3a) and a rear inclined section 32 ( The boundary between the bottom and the rear inclined portion 32 is shown by the dotted line (B) 42 in Figure 3a), and is formed in a shape inclined toward the tip and rear ends at an angle of approximately 14 degrees, as shown by the forward inclined portion angle M and the rear inclined portion angle R in Figure 6. Furthermore, in order to connect the tower section 4 and the buoyancy body section 8, eight struts 6 made of steel pipes with a diameter of approximately 2 m, a thickness of approximately 30 mm, and a length of approximately 10 m are attached around the center of the top surface of the buoyancy body section 8 at circumferential positions extending radially from the center every 45 degrees when viewed on a horizontal plane.

Furthermore, on the side of the buoyant body section 8, six mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, and mooring wire guide hole (F) 30 are formed, each shaped roughly in a semi-cylindrical shape (semi-cylindrical) with a radius of approximately 30 cm, in order to guide the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 described in Figures 1 and 2 at fixed positions on the side of the buoyant body section 8.

Furthermore, a cylindrical pit section 34 with a diameter of approximately 4 m was constructed, as shown by the dotted line (C) 43, extending from approximately the top 33 of the tower section 4, through the tower bottom 39, and to approximately the bottom of the center of the buoyancy body section 8. Furthermore, by installing a staircase (not shown) for moving up and down and a simple lift (not shown) for carrying out inspection work inside the pit section 34, it has become possible to improve work efficiency.

Inside the building 5 of the tower section 4 configured in this manner, a seawater desalination device 58 for turning seawater into fresh water is installed, and a water electrolysis device 53 for electrolyzing the fresh water generated by the seawater desalination device 58 with electricity generated by a power generation device inside the nacelle 3 to generate hydrogen, and a hydrogen liquefaction device 54 for liquefying the electrolyzed hydrogen are installed and operated, thereby producing liquid hydrogen from seawater, and storing the produced liquid hydrogen in a liquid hydrogen storage tank 55 in a cold box installed inside the buoyancy body section 8 via the vertical section 34. By configuring in this manner, it is possible to liquefy the volume of hydrogen generated by electrolysis to about 1/800 of the volume of liquid hydrogen and store it efficiently. The liquid hydrogen produced in this manner is loaded onto a liquefied hydrogen carrier and transported.

FIG. 4 shows the support column 6 and the buoyant body portion 8 described in FIG. 1 and FIG. 2 in a plan view in FIG. 4a and a front view in FIG. 4b. The positions of the six mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, and mooring wire guide hole (F) 30 formed on the outer periphery of the buoyant body section 8 are formed at positions extending radially from the center every 60 degrees when viewed in a horizontal plane with respect to the top surface of the buoyant body section 8, and the shapes of the mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, and mooring wire guide hole (F) 30 are all formed into an approximately semi-cylindrical (semi-cylindrical) shape with a radius of approximately 30 cm.

Furthermore, the eight pillars 6 for connecting the tower section 4 and the buoyancy body section 8 are all formed from cylindrical steel pipes with a diameter of approximately 2 m, a thickness of 30 mm, and a length of 10 m, and are vertically attached so that the centers of the eight pillars (A) 45, pillar (B) 46, pillar (C) 47, pillar (D) 48, pillar (E) 49, pillar (F) 50, pillar (G) 51, and pillar (H) 52 are located at positions extending radially every 45 degrees from the center on a circumference of a radius of approximately 1,050 cm from the center of the top surface of the buoyancy body section 8 when viewed on a horizontal plane, and the upper parts of the eight pillars (A) 45, pillar (B) 46, pillar (C) 47, pillar (D) 48, pillar (E) 49, pillar (F) 50, pillar (G) 51, and pillar (H) 52 are attached to the underside of the tower bottom 39 described in Figure 3. The reason for connecting the tower section 4 and the buoyancy body section 8 with eight pillars 6 in this manner is that by supporting the tower section 4 with round cylindrical pillars with a diameter of approximately 2 m, the resistance caused by waves on the sea surface 7 described in Figure 2 can be minimized, the swaying of the floating offshore wind farm 1 which also has a hydrogen plant attached, and the blades can be faced in the direction from which the wind is blowing can be suppressed.

Figure 5 shows six mooring wires (A) 11, (B) 12, (C) 13, (D) 14, (E) 15, and (F) 16 for mooring the buoyant body section 8 described in Figures 1 and 2 to the seabed 9, in a plan view in Figure 5a and a front view in Figure 5b. The six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 are arranged in six mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, and mooring wire guide hole (F) 30 formed on the side of the buoyant body 8, and the length of each mooring wire is adjusted by the wire winding/feeding machine 60 shown in Figure 7 so that the buoyant body 8 is horizontal to the sea surface 7.This makes it possible for the floating offshore wind power plant 1 with an attached hydrogen factory to easily maintain a horizontal state with respect to the sea surface 7. The positional relationship between the six mooring wire guide holes (A) 25, (B) 26, (C) 27, (D) 28, (E) 29, and (F) 30 and the six seabed foundation piles (A) 17, (B) 18, (C) 19, (D) 20, (E) 21, and (F) 22 is such that the six mooring wires are spaced apart from each other in order to minimize the amount of swaying of the buoyant body 8 due to ocean currents and waves. By fixing six sea-bed foundation piles (A) 17, sea-bed foundation pile (B) 18, sea-bed foundation pile (C) 19, sea-bed foundation pile (D) 20, sea-bed foundation pile (E) 21, and sea-bed foundation pile (F) 22 to the seabed 9 directly below mooring wire guide hole (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, and mooring wire guide hole (F) 30, it has become possible to reduce the area occupied below sea level, which is one of the characteristics of the TLP type.

6 shows the dimensions and angles of the tower section 4, the support column 6, and the buoyant body section 8 explained in Fig. 1 and Fig. 2 with symbols A to S. The tower section 4 is generally conical, the top section 33 is formed with a circular plane, the tower section upper diameter A of the top section 33 is formed with a diameter of about 5 m, and the tower section upper slab thickness B of the top section 33 is formed with a thickness of about 500 mm, and the pit section 34 is formed with a cylindrical shape with a diameter of about 4 m from approximately the upper end of the tower section 33 to approximately the lower end of the buoyant body section 8, penetrating the tower section base 40 as shown by the dashed line (C) 43. Furthermore, the tower height C from the top 33 of the tower section 4 to the tower bottom 39 is approximately 97 m, and the four-story building 5 has a fourth-floor height F of approximately 5 m, a third-floor height G of approximately 5 m, a second-floor height H of approximately 5 m, and a first-floor height I of approximately 5 m. Furthermore, the tower bottom slab thickness D at the bottom of the tower section 4 is approximately 1 m, and the tower foundation diameter S at the bottom of the tower section 4 is formed in a circular shape with a diameter of approximately 25 m. Furthermore, the pillar height E of all eight pillars 6 is approximately 10 m, the thickness of the reinforced concrete of the buoyant body section 8 is approximately 200 mm for the upper, lower and outer peripheral surfaces, the front and rear bottoms of the buoyant body section 8 constructed with a reinforced concrete structure are formed in a shape that is inclined in the forward and rearward directions, the buoyant body diameter N of the buoyant body section 8 is formed in a circular shape with a diameter of approximately 100 m, and the buoyant body height J of the buoyant body section 8 is approximately 10 m, and the forward and rear directions of the buoyant body section 8 described in Figure 3 are approximately 200 mm. The forward inclined portion tip height K and the rear end height R of the rearward inclined portion of the tip of the forward inclined portion 31 and the rearward inclined portion 32 in the rearward direction are both formed to be about 3 m, the forward inclined portion angle M and the rearward inclined portion angle P of the forward inclined portion 31 and the rearward inclined portion 32 described in Fig. 3 are both formed to be about 14 degrees, the forward inclined portion maximum width L of the forward inclined portion 31 and the rearward inclined portion maximum width Q of the rearward inclined portion 32 are both formed to be about 12 m, and further, the buoyant body bottom slab thickness O at the bottom of the pit section 34 is formed to be about 200 mm. By constructing the center of the tower section 4, the centers of the eight pillars 6, and the center of the buoyant body section 8 in a straight line in this way, it has become possible for the floating offshore wind power plant 1 with the hydrogen plant attached to be kept in a well-balanced horizontal state with respect to the sea surface 7.

Figure 7 shows a partial cross-sectional view of one of the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 described in Figure 5, shown wound around the wire winding/delivering machine 60 after passing through the mooring wire guide hole (B) 26 in the buoyancy body section 8. The mooring wire (C) 13 attached to the seabed foundation pile (C) 19 passes through the mooring wire guide hole (B) 26 formed on the side of the buoyant body section 8 described in Figure 5, then through a wire pulley (B) 62 attached near the mooring wire guide hole (B) 26 on the top surface of the buoyant body section 8, and then through a wire pulley (A) 61 attached to the top surface of the buoyant body section 8 near the outside of the vertical compartment 34, and then through a wire passing hole 63 that penetrates the tower section base 40 directly above the wire pulley (A) 61, and is wound around a wire winding and letting-out machine 60 attached near the outside of the vertical compartment 34 inside the first floor 38 of the building. By adjusting the length of the mooring wire (C) 13 configured in this way using the wire winding and letting-out machine 60, it has become possible to easily adjust the vertical height and inclination of the floating offshore wind power plant 1 with an attached hydrogen plant relative to the sea surface 7. In this way, by evenly allocating and arranging the wire winding and letting-out machines 60 for individually winding and letting-out the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 on a circumference near the side of the vertical section 34 inside the first floor 38 of the building, it is possible to efficiently utilize the space inside the first floor 38 and to rationally perform maintenance of the wire winding and letting-out machines 60.

In Figure 7, of the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 described in Figures 1 and 2, only mooring wire (C) 13 has been described. However, by utilizing wire pulleys and wire winding/letting machines in the same manner as for mooring wire (C) 13, the length of each mooring wire can be adjusted by the wire winding/letting machine, making it possible to maintain the horizontal state of the floating offshore wind power plant 1 with an attached hydrogen factory.

The floating offshore wind power plant equipped with a hydrogen factory according to the present invention has been described in detail above based on the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention, and still fall within the technical scope of the present invention.

In Figures 1 and 2, it has been explained that there are "six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16," but the mooring wires can also be made of steel wire rope, synthetic fiber rope, or steel chain.

3 , it has been explained that "liquid hydrogen is produced from seawater by installing and operating a water electrolysis device 53 for generating hydrogen by electrolyzing fresh water with electricity generated by a power generation device inside the nacelle 3, and a hydrogen liquefaction device 54 for liquefying the electrolyzed hydrogen...", but since the amount of power generated by a floating offshore wind turbine is unstable depending on the wind direction and wind force conditions, if electricity generated by the floating offshore wind turbine is directly connected to the water electrolysis device 53, the water electrolysis device 53 will be in an unstable state. Therefore, it is of course effective to operate the water electrolysis device 53 by incorporating a storage battery device (not shown) to stably supply power to the water electrolysis device 53.

In FIG. 1, it has been explained that the support pillar 6 is formed from a steel pipe having a diameter of about 2 m, a thickness of about 30 mm, and a length of about 10 m. However, it is of course possible to manufacture it from a cylindrical reinforced concrete structure having a diameter of about 2 m, a tube thickness of about 20 cm, and a length of about 10 m.

7, it was explained that "...by adjusting the length of the mooring wire (C) 13 configured in this way with the wire winding/releasing machine 60, it is possible to easily adjust the vertical height and inclination of the floating offshore wind farm 1 relative to the sea surface 7." Of course, it is also possible to adjust the buoyancy of the buoyancy body part 8 to the planned buoyancy by injecting and discharging ballast water (seawater) into a ballast water tank (not shown) installed inside the buoyancy body part 8.

FIG. 1 is a perspective view of a floating offshore wind farm equipped with a hydrogen plant according to an embodiment of the present invention. 2 is a front view of the floating offshore wind power plant associated with the hydrogen plant shown in FIG. 1 according to the embodiment. 2A and 2B are plan and front views of a tower section, a support column, and a buoyant body section according to the embodiment. 2A and 2B are plan and front views of the support column and the buoyant body according to the embodiment. 5A and 5B are plan and front views showing the state in which the buoyant body shown in FIG. 4 is fixed to the seabed by seabed foundation piles according to the embodiment. FIG. 2 is a front view of the tower section, the support column, and the buoyant body section according to the embodiment. 3 is a front view showing a method of operating the mooring wire shown in FIG. 2 according to the embodiment;

A Diameter of top of tower section B Thickness of top slab of tower section C Height of tower section D Thickness of bottom slab of tower section E Height of support column F Height of 4th floor of building G Height of 3rd floor of building H Height of 2nd floor of building I Height of 1st floor of building J Height of buoyancy body section K Height of tip of forward inclined section L Maximum width of forward inclined section M Angle of forward inclined section N Diameter of buoyancy body section O Thickness of bottom slab of buoyancy body section P Angle of rear inclined section Q Maximum width of rear inclined section R Height of rear end of rear inclined section S Diameter of tower foundation 1 Floating offshore wind power plant with attached hydrogen plant 2 Blade 3 Nacelle 4 Tower section 5 Building 6 Support column 7 Sea surface 8 Buoyancy body section 9 Seabed 10 Hub 11 Mooring wire (A)
12 Mooring wire (B)
13 Mooring wire (C)
14 Mooring wire (D)
15 Mooring wire (E)
16 Mooring wire (F)
17 Submarine foundation pile (A)
18 Submarine foundation pile (B)
19 Submarine foundation pile (C)
20 Submarine foundation pile (D)
21. Seabed foundation piles (E)
22 Submarine foundation pile (F)
23 Steel pipe 25 Guide hole for mooring wire (A)
26 Mooring wire guide hole (B)
27 Mooring wire guide hole (C)
28 Mooring wire guide hole (D)
29 Mooring wire guide hole (E)
30 Mooring wire guide hole (F)
31 forward inclined portion 32 rear inclined portion 33 top portion 34 pit section 35 fourth floor of building 36 third floor of building 37 second floor of building 38 first floor of building 39 tower bottom 40 tower base 41 dashed line (A)
42 One-dot chain line (B)
43 One-dot chain line (C)
45 Support (A)
46 Pillar (B)
47 Pillar (C)
48 Pillar (D)
49 Pillar (E)
50 Pillar (F)
51 Pillar (G)
52 Pillar (H)
53 Water electrolysis device 54 Hydrogen liquefaction device 55 Liquid hydrogen storage tank 56 One-dot chain line (D)
57 One-dot chain line (E)
58 Seawater desalination equipment 59 Battery equipment 60 Wire winding/unwinding machine 61 Wire pulley (A)
62 Wire pulley (B)
63 Wire hole

Claims (6)

A floating offshore wind turbine is made up of a tower that supports multiple blades and a nacelle that houses a gearbox and generator.
A tower section disposed on the ocean and a buoyant body section disposed underwater are constructed with a reinforced concrete structure, and the tower section and the buoyant body section are connected with a plurality of supports,
The buoyant body is moored to a plurality of seabed foundation piles fixed to the seabed by a plurality of mooring wires,
A water electrolysis device is installed in the tower building to electrolyze water using electricity generated by the floating offshore wind power generation system to generate hydrogen,
A floating offshore wind power plant equipped with a hydrogen factory, characterized in that a liquid hydrogen storage tank for storing hydrogen generated by the water electrolysis device is installed in the buoyant body. The floating offshore wind power plant with hydrogen factory described in claim 1, characterized in that the tower section is roughly conical in shape, the lower part being composed of a multi-story building, the top part being formed with a circular flat surface, and a steel pipe for mounting a nacelle is attached to the top part. A floating offshore wind power plant with a hydrogen factory as described in claim 1 or 2, characterized in that the buoyancy body is generally cylindrical with a hollow interior, and the bottoms in both the forward and rearward directions are inclined toward the front end and rear end in order to float the floating offshore wind power plant constructed on land near the sea on the water. 4. A floating offshore wind farm with a hydrogen factory as described in any one of claims 1 to 3, characterized in that the buoyant body section is moored by a plurality of mooring wires connected to a plurality of seabed foundation piles installed on the seabed using a TLP type mooring system, and one end of the plurality of mooring wires that pass through mooring wire guide holes formed on the side of the buoyant body section are pulled into the building of the tower section via a plurality of wire pulleys, and the horizontal state of the floating offshore wind farm is maintained by adjusting the individual lengths of the mooring wires with a wire winding/letting out machine. A floating offshore wind power plant with a hydrogen factory as described in any one of claims 1 to 4, characterized in that a vertical section is constructed extending from approximately the upper end of the tower section to approximately the lower end of the buoyancy body section, and a simple lift and a staircase for vertical movement are installed inside the vertical section. 6. The floating offshore wind power plant with a hydrogen factory according to claim 1, further comprising a hydrogen liquefaction device installed in a building of the tower section for liquefying hydrogen produced by the water electrolysis device.

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