CN110486218A - A kind of trunnion axis floating tidal current energy generating equipment of single point mooring's form - Google Patents

Abstract

The invention discloses a horizontal-axis floating tidal current energy generating device in the form of single-point mooring. The impeller device on the lower end surface of the floating carrier, the floating carrier is connected with a single point mooring device, and the floating carrier is provided with a directional rudder for guiding the floating carrier. The invention can utilize the weather vane effect to reduce the resistance, independently align the tidal current, and reduce the area of the waterline so as to reduce the wave load.

Description

A horizontal axis floating tidal current energy generation device in the form of single point mooring

technical field

The invention relates to the field of tidal current energy generation, in particular to a horizontal axis floating tidal current energy generation device in the form of single point mooring.

Background technique

Ocean tidal current energy is a kind of marine renewable energy, which can convert the huge kinetic energy contained in the ocean tidal current into electrical energy and utilize it through energy conversion equipment. Compared with other renewable energy sources, ocean tidal current energy has many advantages, which are mainly reflected in: high energy density, strong predictability, stable load and abundant reserves. my country has a coastline as long as 18,000 kilometers, an ocean land of more than 3 million square kilometers, and the theoretical average power generation of tidal current energy exceeds 13,000 megawatts. According to statistics, across the country, there are more than 130 waterways that have the development prospect of tidal current power generation, especially in the Zhoushan area and the Bohai Strait, where the tidal flow velocity can reach more than 3.0m/s and the energy density can reach 15kW/ m2 has good utilization value and development prospects.

There are various ways to obtain energy for marine tidal current energy generation devices. Most devices convert the kinetic energy of the fluid into electrical energy by rotating blades, and some devices obtain energy by swinging hydrofoils and vortex-induced vibrations. The tidal current energy generation device through the water turbine or energy can be divided into horizontal axis type and vertical axis type in form. The main disadvantages of vertical axis turbines are weak self-starting ability, large torque fluctuation within one rotation cycle, and low energy conversion efficiency. From the point of view of fixed mode, tidal current energy generation devices can be divided into fixed type and floating type. The fixed tidal current energy generation device is fixed on the seabed by its own gravity, or through a support structure such as a jacket, and is immersed in water as a whole. Although it is not affected by sea conditions, the cost of installation and maintenance is relatively high, and it cannot be moved.

Due to the proximity to the bottom of the sea, the flow velocity of the tidal current slows down, which limits the performance of the turbine. The floating turbine is fixed on the floating carrier and fixed on the seabed through the mooring system. Adopting floating structure design, it can adapt to a wide range of water depths, has no special requirements on seabed topography, and is easy to install and maintain. Due to the fast surface flow, it is easy to obtain more energy.

For tidal current energy devices, the cost of power generation is significantly higher than that of offshore wind energy. The current high cost is mainly due to the unclear load characteristics. In order to ensure structural safety from structural design to later maintenance, a large safety margin is adopted, resulting in high power generation costs of tidal current energy devices.

Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects.

Contents of the invention

The purpose of the present invention is to provide a single-point mooring type horizontal axis floating tidal current energy generating device, which uses the windvane effect to reduce resistance, independently aligns the tidal current, and reduces the waterline area to reduce the wave load.

The above-mentioned technical purpose of the present invention is achieved by the following technical solutions: a horizontal-axis floating tidal current energy generating device in the form of single-point mooring, including a floating carrier, an impeller device connected to the lower end surface of the floating carrier, and the floating carrier A single point mooring device is connected, and the floating carrier is provided with a directional rudder for guiding the floating carrier.

A further setting of the present invention is that: the floating carrier includes a floating main body and two balancing floating bodies respectively arranged on the floating main body, and the balancing floating bodies protrude from the lower end surface of the floating main body.

A further setting of the present invention is that: the impeller devices are arranged in two groups, both groups of impeller devices are arranged on the balance floating body, and the impellers of the two groups of impeller devices rotate in opposite directions.

In summary, the present invention has the following beneficial effects:

1) Due to the adoption of a new type of single point mooring, the windvane effect can be used to reduce resistance and self-align the tide.

2) The double-body streamlined design is adopted, and the reduced waterline area reduces the wave load, providing buoyancy and large restoring moment.

3) The horizontal-axis three-blade rotating impeller is adopted, and the rolling and overturning moment is offset by the parallel and counter-rotating arrangement.

4) By setting the directional rudder mechanism in the wake field, on the one hand, it disrupts the flow field and reduces the influence range of the wake, on the other hand, it generates an autonomous control moment, and cooperates with the single-point mooring system to independently align the direction of the tidal current. Compared with the conventional steering device, the structure is greatly simplified, no active control is required, and the cost is saved.

Description of drawings

Fig. 1 is a structural schematic diagram one of the present invention;

Fig. 2 is a schematic diagram of the second structure of the present invention.

The names of the corresponding parts represented by the numbers in the figure: 1. impeller device; 2. single point mooring device; 3. directional rudder; 4. balance floating body; 5. floating body.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with illustrations and specific embodiments.

As shown in Figures 1 and 2, a single-point mooring horizontal-axis floating tidal current energy generation device proposed by the present invention includes a floating carrier and an impeller device 1 connected to the lower end surface of the floating carrier. The impeller device 1 mainly includes Engine room and impeller (being prior art), floating carrier is connected with single point mooring device 2, and single point mooring device 2 is the single point mooring system (belonging to prior art) of catenary type, and floating carrier is provided with for The directional rudder 3 for guiding the floating carrier.

The floating carrier includes a floating main body 5 and two balance floating bodies 4 separately arranged on the floating main body 5. The balanced floating bodies 4 protrude from the lower end surface of the floating main body 5; The balance floating body 4 is described above, and the impellers of the two sets of impeller devices 1 are counter-rotating. The two balanced floating bodies 4 and the floating main body 5 can improve the stability of the floating carrier and avoid the turbulence of the floating carrier. By adopting the two-body structure of the impeller device 1, the waterline area and wave load are reduced, and a larger restoring moment is generated while providing buoyancy.

The advantages achieved in this application are as follows:

1) Due to the adoption of a new type of single point mooring, the windvane effect can be used to reduce resistance and self-align the tide.

2) The double-body streamlined design is adopted, and the reduced waterline area reduces the wave load, providing buoyancy and large restoring moment.

3) The horizontal-axis three-blade rotating impeller is adopted, and the rolling and overturning moment is offset by the parallel and counter-rotating arrangement.

4) By setting the directional rudder 3 mechanism in the wake field, on the one hand, it disrupts the flow field and reduces the influence range of the wake, on the other hand, it generates an autonomous control moment, and cooperates with the single point mooring system to autonomously align the direction of the tidal current. Compared with the conventional steering device, the structure is greatly simplified, no active control is required, and the cost is saved.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (3)

1. a kind of trunnion axis floating tidal current energy generating equipment of single point mooring's form, including floating carrier, it is connected to floating carrier The impeller unit (1) of lower end surface, it is characterised in that: the floating carrier is connected with single point mooring unit (2), the floating carrier It is provided with the orientation rudder (3) for being oriented to floating carrier.

2. a kind of trunnion axis floating tidal current energy generating equipment of single point mooring's form according to claim 1, feature exist In: the floating carrier include floatable body (5), two balance floating bodies (4) for being divided into the floatable body (5), it is described flat Weighing apparatus floating body (4) protrudes from the floatable body (5) lower end surface.

3. a kind of trunnion axis floating tidal current energy generating equipment of single point mooring's form according to claim 2, feature exist In: the impeller unit (1) is set as two groups, and two groups of impeller units (1) are all set in the balance floating body (4), and two groups of leaves The impeller of wheel apparatus (1) is in opposite rotation.