FLOATING DRUM TURBINE FOR ELECTRICITY GENERATION

Abstract

A floating drum turbine is used for generating the electrical energy from the kinetic energy of a water stream (sea wave or river flow) that provides the mechanical energy needed to rotate an electrical generator for generating the electricity. The drum turbine is installed on a buoyant skid anchored to the seabed by some chains/ropes to keep it in a fixed position and direction along the water stream. The turbine is coupled to an electrical generator with a power transmission system, and generates the electricity that is transferred to the coast using a cable system floated on the water surface.

Claims

1. A floating drum turbine, which is used for generating the electricity from the kinetic energy of a water stream (sea wave, river/channel flow), and transforming it into the mechanical energy to rotate an electrical generator (or mechanical pump) comprising: a drum turbine consists of some longitudinal-radial blades, side plates, and a central shaft to get the mechanical energy from the water stream; a buoyant skid consists of two hollow capsules, and two rafters that is placed below the bearing housings to float the said turbine on the water stream; two bearing housings placed on the ends of the said turbine shaft to ease the shaft rotation; two base frames installed on the hollow capsules to support the generator (or pump) and the counterweight box; an electrical generator coupled to the said turbine using a power transmission system to generate the electricity (the generator can be replaced by a mechanical pump to supply a pressurized fluid into a fluid circuit); a power transmission system (gearbox, belt/chain system) for coupling the said turbine to the said generator (or pump); a counterweight box (filled with sand or metal scrap) installed on the opposite side of the said generator (or pump) to balance the whole system; two or four chains/ropes for anchoring the said skid to the river/channel bankside or seabed to keep the skid in a fixed position and direction along the water stream;

2. The floating drum turbine of claim 1, wherein the turbine is a tangential flow type over the water surface, and the turbine blades and side plates are made from aluminum alloys or FRP materials, and the turbine shaft is made of stainless steel pipes.

3. The floating drum turbine of claim 1, wherein the hollow capsules and the associated guide blades are made from plastic or FRP materials, and the rafters are made from galvanized/carbon steel materials.

4. The floating drum turbine of claim 1, wherein the chains/ropes for anchoring the buoyant skid are made from galvanized steel materials.

5. The floating drum turbine of claim 1, wherein the base frames and counterweight box are made from galvanized/carbon steel materials.

6. The floating drum turbine of claim 1, wherein the turbine merge depth into the water is adjusted by placing some shim plates under the bearing housings to enhance the kinetic energy conversation into the electrical energy by the turbine.

7. The floating drum turbine of claim 1, wherein the belt tension of the power transmission system is adjusted by placing some shim plates under the generator bases.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is an operational drawing of the invented floating drum turbine.

[0018] FIG. 2 is a 2D drawing of a floating drum turbine showing its components, including section and side views of the invented turbine.

[0019] FIG. 3 is a 3D drawing of a floating drum turbine.

DESCRIPTION OF THE INVENTION

[0020] The operation method of this invention is shown in FIG. 1, a floating drum turbine with some longitudinal radial blades that floats on a water stream, and be anchored to the seabed that is rotated by the water stream pushing the turbine blades. The drum length and diameter are the major parameters of the turbine that directly determine the amount of the generated mechanical energy. The turbine floats on the water surface using a buoyant skid mounted below the turbine shaft bearing housings. The buoyant skid consists of two rafter connected hollow capsules, each has a diverter in the front portion to increase the stream velocity acted on the turbine blades, and a guide blade in the bottom portion to keep the skid along the water stream. The skid is anchored to the seabed by some chains/ropes to keep it in a fixed position. The turbine's merge depth into the water is an essential parameter of the system for enhancing the kinetic energy conversation into the electrical energy that is adjusted by placing some shim plates under the bearing housings to merge the turbine blades fully into the water stream.

[0021] The major components of this invention are shown in FIG. 2, which includes the turbine side plates 1, a turbine shaft 7, the turbine blades 8, two bearing housings 3, two hollow capsules 2 associated with two guide blades 9, two rafters 11, two base frames 4, an electrical generator 5, a counterweight box 6, and a power transmission system 10 (including a belt and two pulleys installed on the shafts of the turbine and generator).

[0022] The drum turbine consists of three major parts 1, 7, and 8. The bearing housings 3 enable the turbine to rotate freely, and transfers the generated torque to the generator shaft through a power transmission system 10 for generating the electricity. The generated electricity is transferred to the coast using a floating cable system. Two base frames 4 are for mounting the generator 5 and the counterweight box 6 that balances the turbine set. The reaction forces, applied to the turbine set by the water stream, are absorbed by anchoring the turbine to the seabed. The hollow capsules 2 are connected to each other by two rafters 11.

[0023] To decrease the turbine's moment of inertia that eases rotation, the turbine blades and side plates are made from a low-weight materials like as aluminum alloys or FRP materials that are able to resist against the sea water for the corrosion/erosion protection, and the turbine shaft that is a hollow shaft made from stainless steel pipes to present high strength. The hollow capsules and associated guide blades are made from FRP materials for resisting against the sea water for the corrosion/erosion protection. The base frames, rafters, and counterweight box are made from galvanized steel materials for the corrosion protection.