JP2014224543A - Power generating method and maintenance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a propeller-type water turbine of a conventional seawater power generating set becomes impossible to generate power due to a stop of rotation caused by the deformation and damage of a blade, and maintenance is required.SOLUTION: A power generating method utilizes a ship body which has anchors at right and left side faces, respectively, and floats on a sea level, and a power generating set in which a detachable filer net is provided at a flow-in port of a cylindrical flow conduit having a proper length, and which is provided in a proper position in the conduit. The flow conduit is fixed to a lower part of the ship body, the anchors at the right and left side faces are dropped on the sea bottom in a state that the flow conduit is oriented in a flow of an ocean current, the ship body is anchored, the respective anchors and the ship body form a trapezoid when viewed from the flow of the ocean current, the flow conduit is disposed inside the trapezoid, and thus power is generated.

Description

The present invention relates to an ocean current power generation device, and more particularly to a power generation device for a propeller type water turbine.

The propeller blades are deformed and damaged as a cause of the power generation stop of the power generation device of the conventional propeller type turbine. The cause of deformation and damage to the blades is the turbulent flow where the flow (direction and speed) of the ocean current changes abruptly, and the blades are overloaded, and the blades rotate due to deformation and damage due to the collision of drifting objects and fish in the ocean current. Stops and power generation becomes impossible.
For example, in the ocean current power generation device disclosed in Japanese Patent Application Laid-Open No. 2004-68638, the propeller-type water turbine blades with a diameter of 3 m are deformed due to turbulence, collision with drifting objects and fish, or stopped rotating due to damage, and maintenance is performed, making power generation impossible. Become.

Prior art relating to ocean current power generation devices is as follows.

The blades of the propeller type turbine of the ocean current power generation apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-68638 are excessively burdened by turbulent flow. In addition, the blades are deformed or damaged by the collision of drifting objects and fish in the ocean current, and the rotation stops and power generation becomes impossible for maintenance.

Japanese Patent Laying-Open No. 2005-240786 discloses a tidal current power generation apparatus in which a drifting object or fish flows into a cylindrical body of an enlarged inlet along with a tidal current, concentrates at a reduced outlet, and collides with a water turbine to deform or damage a blade. Occurs and rotation stops and power generation is disabled for maintenance.

JP 2004-68638 A JP-A-2005-240786

Regarding ocean current power generation equipment, stable power generation is ensured except for blade deformation and damage that cause rotation of propeller turbines.

The solution to the above problem is to eliminate the turbulent flow and the collision of drifting objects and fish that cause the deformation and damage of the blades of the propeller type turbine.
In the cylindrical flow conduit of the first aspect, the turbulent flow makes the flow direction and speed constant in the flow conduit, and the blade is not overburdened. In addition, drifting objects and fish are prevented from flowing into the flow conduit by a filter net set at the flow conduit inlet.
Therefore, by eliminating the cause of the rotation stop due to the deformation and damage of the blades of the propeller turbine, it is possible to avoid the stop of power generation and to stably generate power.

The invention according to claim 2 equalizes the flow in the pipe by the adjusting plate having a large number of through holes at appropriate positions in the flow conduit of claim 1.

As described above, the ocean current power generation device according to the present invention eliminates the cause of deformation and damage of the propeller blades due to the turbulence of the ocean current and the collision of drifting objects and fish, thereby avoiding the stoppage of the turbine wheel and stably supplying the power. Make it possible.
Furthermore, the cost can be reduced by omitting difficult maintenance work in the sea accompanying the deformation and damage of the blades.

Schematic sectional view of the ocean current power generation device of the embodiment Schematic showing an example of use of the ocean current power generation device of the present invention in the ocean

Hereinafter, an embodiment of a current generator according to the present invention will be described.

The FRP flow conduit 2 of the ocean current power generation apparatus 1 of the present invention shown in the figure has a filter net 3 attached to an inlet 12 having a length of 30 m and an inner diameter of 3.5 m, and the inside of the outlet 13 of the same conduit 2. In the vicinity, a propeller-type water turbine generator 4 having a diameter of 3 m is supported on the inner diameter center by a support plate 6.
An adjusting plate 7 having a large number of through holes is arranged at the center of the same flow conduit 2, and the flow passing through the through holes is equalized and directed to the blades 5.
In FIG. 2, the ocean current power generation device 1 is fixed to the lower part of a floating body (hull) 9, and the net 3 of the flow conduit 2 is moored to the anchor 8 in a state suitable for the flow of the ocean current.
The dotted line 11 shown inside the inlet 12 and the outlet 13 of the outflow conduit 2 indicates an on-off valve. The open / close valve 11 closes the open / close valve and discharges seawater in the pipe with a suction pump when maintenance is performed in the flow conduit 2 to enable maintenance work.

  The method for generating electricity of the present invention is used in an ocean current power generation apparatus.

1 Current generator (arrows indicate flow)
2 Flow conduit 3 Filter net 4 Propeller generator 5 Blade 6 Support plate 7 Adjustment plate 8 Anchor 9 Floating body (hull)
10 Mooring rope 11 On-off valve 12 Inlet 13 Outlet

Claims (4)

A hull that has an anchor on each of the left and right side surfaces and floats on the sea surface, and a power generation device that is arranged at an appropriate position inside the pipe by arranging a cylindrical filter net that can be freely attached to the inlet of an appropriate length of flow conduit. A power generation method to be used, fixing the flow conduit to a lower portion of the hull, and with the flow conduit facing the flow of the ocean current, the anchors on the left and right side surfaces are lowered to the seabed, and the hull is moored, A method of generating electricity by forming a trapezoid with each anchor and the hull when viewed from the flow of an ocean current, and disposing the flow conduit inside the trapezoid. The method of generating electric power according to claim 1, wherein the power generation device is a propeller-type water turbine generator. The method for generating electricity according to claim 1 or 2, wherein a lower part of the hull has an elliptical cross section, and the lowermost part of the elliptical shape and the uppermost part of the cylindrical flow conduit are connected. The power generation method according to any one of claims 1 to 3, wherein an open / close valve is provided inside each of the inlet and outlet of the flow conduit, and the open / close valve of the flow conduit is closed to release seawater. A maintenance method in the power generation method for performing maintenance.

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