A tidal power generation device includes a container assembly and a power generation device arranged in the container assembly. A water inlet of the container assembly allows a tidal water flow to enter. An entrance guide plate of the container assembly causes the water flow to advance in the direction of the power generation device to push the power generation device's thrust plates, and thereby driving the power generation device's thrust plate traction mechanism to make a power generator of the power generation device convert kinetic energy into electrical energy. After the water flow pushes the thrust plates, it enters a pressure accumulating pool of the container assembly. Then, the water flow in the pressure accumulating pool flows to a backflow guide plate of the container assembly, and flows to a first pressure relief pool of the container assembly to continue pushing the thrust plates.

A startup method of a Francis turbine according to an embodiment includes: a first rotation-speed increasing step in which a rotation speed of the runner is increased by opening the guide vane at a first opening; a second rotation-speed increasing step in which the increase in the rotation speed of the runner is accelerated by opening the guide vane at a second opening that is larger than the first opening after the first rotation-speed increasing step; and a rotation-speed regulating step in which the rotation speed of the runner is regulated to a rated rotation speed by opening the guide vane at a no-load opening after the second rotation-speed increasing step. The first opening is an opening that is half or less than the no-load opening.

An electric generating precipitation collection system comprising a collection tank, a plurality of pipes, a plurality of valves, a piston assembly, and an outlet. The system is configured to collect a liquid, direct the liquid through the pipes and valves to pressurize the liquid with the piston assembly, and eject the pressurized liquid at the outlet. The plurality of pipes and valves are arranged relative to the piston assembly so that a piston can pressurize the liquid in the pipe connected to the outlet. The system may further comprise a generator that converts the force of the pressurized liquid from the outlet into electricity. Further, a collection basin may be included in the system to collect liquid after passing through the generator.

A startup method of a Francis turbine according to an embodiment includes: a bypass-valve opening step of opening the bypass valve with the inlet valve closed; an inlet-valve opening step of opening the inlet valve after the bypass-valve opening step; and a first rotation-speed increasing step of increasing a rotation speed of the runner by opening the guide vane at an opening that is 50% or more of a maximum opening before a flow velocity of a swirling flow flowing around the runner reaches 90 m/sec.

This disclosure includes subsea pumping apparatuses and related methods. Some apparatuses include one or more subsea pumps, each having an inlet and an outlet, and one or more motors, each configured to actuate at least one pump to communicate a hydraulic fluid from the inlet to the outlet, where the subsea pumping apparatus is configured to be in fluid communication with a hydraulically actuated device of a blowout preventer. Some subsea pumping apparatuses include one or more of: a desalination system configured to produce at least a portion of the hydraulic fluid; one or more valves, each configured to selectively route hydraulic fluid from an outlet of a pump to, for example, a subsea environment, a reservoir, and/or the inlet of the pump; and a reservoir configured to store at least a portion of the hydraulic fluid. Some apparatuses are configured to be directly coupled to the hydraulically actuated device.

An electric generating precipitation collection system comprising a collection tank, a plurality of pipes, a plurality of valves, a piston assembly, and an outlet. The system is configured to collect a liquid, direct the liquid through the pipes and valves to pressurize the liquid with the piston assembly, and eject the pressurized liquid at the outlet. The plurality of pipes and valves are arranged relative to the piston assembly so that a piston can pressurize the liquid in the pipe connected to the outlet. The system may further comprise a generator that converts the force of the pressurized liquid from the outlet into electricity. Further, a collection basin may be included in the system to collect liquid after passing through the generator.

A hybrid heat engine system includes a chamber housing including an inlet and an outlet. A piston is disposed in an interior volume of the chamber housing. The hybrid heat engine system further includes a valve configured to provide a first fluid in a heated state from a heat source to the interior volume via the inlet. The first fluid in the heated state is to push against a first side of the piston to cause a second side of the piston to push a working fluid out of the interior volume and through a turbine to generate energy.

Examples of the present disclosure are related to systems and methods for utilizing effluent pipeline to generate energy. More particularly, embodiments disclose positioning a turbine within a bypass pipeline, wherein the bypass pipeline has a greater diameter than the effluent pipeline.

The present invention provides a booster apparatus (10) for entraining gas in a flowing second fluid. The booster apparatus comprises a booster housing (116) for receiving a fluid. The booster apparatus has at least one inlet (123) through which a first fluid passes to be entrained in the second fluid when the second fluid is flowing through the booster housing. The present invention also provides a booster assembly (12) comprising a booster apparatus (10) and a fluid motive mechanism such as a turbine unit (11).

The invention relates to a method for controlling a water sluice gate drive for a water sluice gate, in particular for a roller sluice gate, preferably in a hydroelectric power plant, wherein the drive has an electric machine, in particular has an asynchronous machine, in particular an asynchronous motor/generator. According to the invention, it is provided that the electric machine, in particular an asynchronous machine, has a fan brake, wherein the method comprises the steps of: disengagement of the fan brake in the case that an insufficient power supply is indicated, self-actuated operation of the electric machine, in particular an asynchronous machine, wherein the electric machine, in particular an asynchronous machine, is operated in generative island operation, in which a rotating field is generated in a self-actuating manner.